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diff --git a/INSTALL b/INSTALL deleted file mode 100644 index 23e5f25..0000000 --- a/INSTALL +++ /dev/null @@ -1,236 +0,0 @@ -Installation Instructions -************************* - -Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005 Free -Software Foundation, Inc. - -This file is free documentation; the Free Software Foundation gives -unlimited permission to copy, distribute and modify it. - -Basic Installation -================== - -These are generic installation instructions. - - The `configure' shell script attempts to guess correct values for -various system-dependent variables used during compilation. It uses -those values to create a `Makefile' in each directory of the package. -It may also create one or more `.h' files containing system-dependent -definitions. Finally, it creates a shell script `config.status' that -you can run in the future to recreate the current configuration, and a -file `config.log' containing compiler output (useful mainly for -debugging `configure'). - - It can also use an optional file (typically called `config.cache' -and enabled with `--cache-file=config.cache' or simply `-C') that saves -the results of its tests to speed up reconfiguring. (Caching is -disabled by default to prevent problems with accidental use of stale -cache files.) - - If you need to do unusual things to compile the package, please try -to figure out how `configure' could check whether to do them, and mail -diffs or instructions to the address given in the `README' so they can -be considered for the next release. If you are using the cache, and at -some point `config.cache' contains results you don't want to keep, you -may remove or edit it. - - The file `configure.ac' (or `configure.in') is used to create -`configure' by a program called `autoconf'. You only need -`configure.ac' if you want to change it or regenerate `configure' using -a newer version of `autoconf'. - -The simplest way to compile this package is: - - 1. `cd' to the directory containing the package's source code and type - `./configure' to configure the package for your system. If you're - using `csh' on an old version of System V, you might need to type - `sh ./configure' instead to prevent `csh' from trying to execute - `configure' itself. - - Running `configure' takes awhile. While running, it prints some - messages telling which features it is checking for. - - 2. Type `make' to compile the package. - - 3. Optionally, type `make check' to run any self-tests that come with - the package. - - 4. Type `make install' to install the programs and any data files and - documentation. - - 5. You can remove the program binaries and object files from the - source code directory by typing `make clean'. To also remove the - files that `configure' created (so you can compile the package for - a different kind of computer), type `make distclean'. There is - also a `make maintainer-clean' target, but that is intended mainly - for the package's developers. If you use it, you may have to get - all sorts of other programs in order to regenerate files that came - with the distribution. - -Compilers and Options -===================== - -Some systems require unusual options for compilation or linking that the -`configure' script does not know about. Run `./configure --help' for -details on some of the pertinent environment variables. - - You can give `configure' initial values for configuration parameters -by setting variables in the command line or in the environment. 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That is ok -- this is a - # normal compilation that the losing compiler can handle. If no - # `.c' file was seen then we are probably linking. That is also - # ok. - exec "$@" -fi - -# Name of file we expect compiler to create. -cofile=`echo "$cfile" | sed -e 's|^.*/||' -e 's/\.c$/.o/'` - -# Create the lock directory. -# Note: use `[/.-]' here to ensure that we don't use the same name -# that we are using for the .o file. 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otherwise it will be - automatically deduced at run-time. - STACK_DIRECTION > 0 => grows toward higher addresses - STACK_DIRECTION < 0 => grows toward lower addresses - STACK_DIRECTION = 0 => direction of growth unknown */ -#undef STACK_DIRECTION - -/* Define to 1 if you have the ANSI C header files. */ -#undef STDC_HEADERS - -/* Version number of package */ -#undef VERSION - -/* Define to 1 if `lex' declares `yytext' as a `char *' by default, not a - `char[]'. */ -#undef YYTEXT_POINTER - -/* Define to empty if `const' does not conform to ANSI C. */ -#undef const - -/* Define to rpl_malloc if the replacement function should be used. */ -#undef malloc - -/* Define to `int' if <sys/types.h> does not define. */ -#undef pid_t - -/* Define to rpl_realloc if the replacement function should be used. */ -#undef realloc - -/* Define to `unsigned' if <sys/types.h> does not define. */ -#undef size_t - -/* Define as `fork' if `vfork' does not work. */ -#undef vfork diff --git a/config.guess b/config.guess deleted file mode 100755 index ad5281e..0000000 --- a/config.guess +++ /dev/null @@ -1,1466 +0,0 @@ -#! /bin/sh -# Attempt to guess a canonical system name. -# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, -# 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. - -timestamp='2005-08-03' - -# This file is free software; you can redistribute it and/or modify it -# under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or -# (at your option) any later version. -# -# This program is distributed in the hope that it will be useful, but -# WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -# General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA -# 02110-1301, USA. -# -# As a special exception to the GNU General Public License, if you -# distribute this file as part of a program that contains a -# configuration script generated by Autoconf, you may include it under -# the same distribution terms that you use for the rest of that program. - - -# Originally written by Per Bothner <per@bothner.com>. -# Please send patches to <config-patches@gnu.org>. Submit a context -# diff and a properly formatted ChangeLog entry. -# -# This script attempts to guess a canonical system name similar to -# config.sub. If it succeeds, it prints the system name on stdout, and -# exits with 0. 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Hard to guess exactly what SunOS6 will be like, but - # it's likely to be more like Solaris than SunOS4. - echo sparc-sun-solaris3`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'` - exit ;; - sun4*:SunOS:*:*) - case "`/usr/bin/arch -k`" in - Series*|S4*) - UNAME_RELEASE=`uname -v` - ;; - esac - # Japanese Language versions have a version number like `4.1.3-JL'. - echo sparc-sun-sunos`echo ${UNAME_RELEASE}|sed -e 's/-/_/'` - exit ;; - sun3*:SunOS:*:*) - echo m68k-sun-sunos${UNAME_RELEASE} - exit ;; - sun*:*:4.2BSD:*) - UNAME_RELEASE=`(sed 1q /etc/motd | awk '{print substr($5,1,3)}') 2>/dev/null` - test "x${UNAME_RELEASE}" = "x" && UNAME_RELEASE=3 - case "`/bin/arch`" in - sun3) - echo m68k-sun-sunos${UNAME_RELEASE} - ;; - sun4) - echo sparc-sun-sunos${UNAME_RELEASE} - ;; - esac - exit ;; - aushp:SunOS:*:*) - echo sparc-auspex-sunos${UNAME_RELEASE} - exit ;; - # The situation for MiNT is a little confusing. The machine name - # can be virtually everything (everything which is not - # "atarist" or "atariste" at least should have a processor - # > m68000). The system name ranges from "MiNT" over "FreeMiNT" - # to the lowercase version "mint" (or "freemint"). Finally - # the system name "TOS" denotes a system which is actually not - # MiNT. But MiNT is downward compatible to TOS, so this should - # be no problem. - atarist[e]:*MiNT:*:* | atarist[e]:*mint:*:* | atarist[e]:*TOS:*:*) - echo m68k-atari-mint${UNAME_RELEASE} - exit ;; - atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*) - echo m68k-atari-mint${UNAME_RELEASE} - exit ;; - *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*) - echo m68k-atari-mint${UNAME_RELEASE} - exit ;; - milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*) - echo m68k-milan-mint${UNAME_RELEASE} - exit ;; - hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*) - echo m68k-hades-mint${UNAME_RELEASE} - exit ;; - *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*) - echo m68k-unknown-mint${UNAME_RELEASE} - exit ;; - m68k:machten:*:*) - echo m68k-apple-machten${UNAME_RELEASE} - exit ;; - powerpc:machten:*:*) - echo powerpc-apple-machten${UNAME_RELEASE} - exit ;; - RISC*:Mach:*:*) - echo mips-dec-mach_bsd4.3 - exit ;; - RISC*:ULTRIX:*:*) - echo mips-dec-ultrix${UNAME_RELEASE} - exit ;; - VAX*:ULTRIX*:*:*) - echo vax-dec-ultrix${UNAME_RELEASE} - exit ;; - 2020:CLIX:*:* | 2430:CLIX:*:*) - echo clipper-intergraph-clix${UNAME_RELEASE} - exit ;; - mips:*:*:UMIPS | mips:*:*:RISCos) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c -#ifdef __cplusplus -#include <stdio.h> /* for printf() prototype */ - int main (int argc, char *argv[]) { -#else - int main (argc, argv) int argc; char *argv[]; { -#endif - #if defined (host_mips) && defined (MIPSEB) - #if defined (SYSTYPE_SYSV) - printf ("mips-mips-riscos%ssysv\n", argv[1]); exit (0); - #endif - #if defined (SYSTYPE_SVR4) - printf ("mips-mips-riscos%ssvr4\n", argv[1]); exit (0); - #endif - #if defined (SYSTYPE_BSD43) || defined(SYSTYPE_BSD) - printf ("mips-mips-riscos%sbsd\n", argv[1]); exit (0); - #endif - #endif - exit (-1); - } -EOF - $CC_FOR_BUILD -o $dummy $dummy.c && - dummyarg=`echo "${UNAME_RELEASE}" | sed -n 's/\([0-9]*\).*/\1/p'` && - SYSTEM_NAME=`$dummy $dummyarg` && - { echo "$SYSTEM_NAME"; exit; } - echo mips-mips-riscos${UNAME_RELEASE} - exit ;; - Motorola:PowerMAX_OS:*:*) - echo powerpc-motorola-powermax - exit ;; - Motorola:*:4.3:PL8-*) - echo powerpc-harris-powermax - exit ;; - Night_Hawk:*:*:PowerMAX_OS | Synergy:PowerMAX_OS:*:*) - echo powerpc-harris-powermax - exit ;; - Night_Hawk:Power_UNIX:*:*) - echo powerpc-harris-powerunix - exit ;; - m88k:CX/UX:7*:*) - echo m88k-harris-cxux7 - exit ;; - m88k:*:4*:R4*) - echo m88k-motorola-sysv4 - exit ;; - m88k:*:3*:R3*) - echo m88k-motorola-sysv3 - exit ;; - AViiON:dgux:*:*) - # DG/UX returns AViiON for all architectures - UNAME_PROCESSOR=`/usr/bin/uname -p` - if [ $UNAME_PROCESSOR = mc88100 ] || [ $UNAME_PROCESSOR = mc88110 ] - then - if [ ${TARGET_BINARY_INTERFACE}x = m88kdguxelfx ] || \ - [ ${TARGET_BINARY_INTERFACE}x = x ] - then - echo m88k-dg-dgux${UNAME_RELEASE} - else - echo m88k-dg-dguxbcs${UNAME_RELEASE} - fi - else - echo i586-dg-dgux${UNAME_RELEASE} - fi - exit ;; - M88*:DolphinOS:*:*) # DolphinOS (SVR3) - echo m88k-dolphin-sysv3 - exit ;; - M88*:*:R3*:*) - # Delta 88k system running SVR3 - echo m88k-motorola-sysv3 - exit ;; - XD88*:*:*:*) # Tektronix XD88 system running UTekV (SVR3) - echo m88k-tektronix-sysv3 - exit ;; - Tek43[0-9][0-9]:UTek:*:*) # Tektronix 4300 system running UTek (BSD) - echo m68k-tektronix-bsd - exit ;; - *:IRIX*:*:*) - echo mips-sgi-irix`echo ${UNAME_RELEASE}|sed -e 's/-/_/g'` - exit ;; - ????????:AIX?:[12].1:2) # AIX 2.2.1 or AIX 2.1.1 is RT/PC AIX. - echo romp-ibm-aix # uname -m gives an 8 hex-code CPU id - exit ;; # Note that: echo "'`uname -s`'" gives 'AIX ' - i*86:AIX:*:*) - echo i386-ibm-aix - exit ;; - ia64:AIX:*:*) - if [ -x /usr/bin/oslevel ] ; then - IBM_REV=`/usr/bin/oslevel` - else - IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE} - fi - echo ${UNAME_MACHINE}-ibm-aix${IBM_REV} - exit ;; - *:AIX:2:3) - if grep bos325 /usr/include/stdio.h >/dev/null 2>&1; then - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #include <sys/systemcfg.h> - - main() - { - if (!__power_pc()) - exit(1); - puts("powerpc-ibm-aix3.2.5"); - exit(0); - } -EOF - if $CC_FOR_BUILD -o $dummy $dummy.c && SYSTEM_NAME=`$dummy` - then - echo "$SYSTEM_NAME" - else - echo rs6000-ibm-aix3.2.5 - fi - elif grep bos324 /usr/include/stdio.h >/dev/null 2>&1; then - echo rs6000-ibm-aix3.2.4 - else - echo rs6000-ibm-aix3.2 - fi - exit ;; - *:AIX:*:[45]) - IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'` - if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then - IBM_ARCH=rs6000 - else - IBM_ARCH=powerpc - fi - if [ -x /usr/bin/oslevel ] ; then - IBM_REV=`/usr/bin/oslevel` - else - IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE} - fi - echo ${IBM_ARCH}-ibm-aix${IBM_REV} - exit ;; - *:AIX:*:*) - echo rs6000-ibm-aix - exit ;; - ibmrt:4.4BSD:*|romp-ibm:BSD:*) - echo romp-ibm-bsd4.4 - exit ;; - ibmrt:*BSD:*|romp-ibm:BSD:*) # covers RT/PC BSD and - echo romp-ibm-bsd${UNAME_RELEASE} # 4.3 with uname added to - exit ;; # report: romp-ibm BSD 4.3 - *:BOSX:*:*) - echo rs6000-bull-bosx - exit ;; - DPX/2?00:B.O.S.:*:*) - echo m68k-bull-sysv3 - exit ;; - 9000/[34]??:4.3bsd:1.*:*) - echo m68k-hp-bsd - exit ;; - hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*) - echo m68k-hp-bsd4.4 - exit ;; - 9000/[34678]??:HP-UX:*:*) - HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'` - case "${UNAME_MACHINE}" in - 9000/31? ) HP_ARCH=m68000 ;; - 9000/[34]?? ) HP_ARCH=m68k ;; - 9000/[678][0-9][0-9]) - if [ -x /usr/bin/getconf ]; then - sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null` - sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null` - case "${sc_cpu_version}" in - 523) HP_ARCH="hppa1.0" ;; # CPU_PA_RISC1_0 - 528) HP_ARCH="hppa1.1" ;; # CPU_PA_RISC1_1 - 532) # CPU_PA_RISC2_0 - case "${sc_kernel_bits}" in - 32) HP_ARCH="hppa2.0n" ;; - 64) HP_ARCH="hppa2.0w" ;; - '') HP_ARCH="hppa2.0" ;; # HP-UX 10.20 - esac ;; - esac - fi - if [ "${HP_ARCH}" = "" ]; then - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - - #define _HPUX_SOURCE - #include <stdlib.h> - #include <unistd.h> - - int main () - { - #if defined(_SC_KERNEL_BITS) - long bits = sysconf(_SC_KERNEL_BITS); - #endif - long cpu = sysconf (_SC_CPU_VERSION); - - switch (cpu) - { - case CPU_PA_RISC1_0: puts ("hppa1.0"); break; - case CPU_PA_RISC1_1: puts ("hppa1.1"); break; - case CPU_PA_RISC2_0: - #if defined(_SC_KERNEL_BITS) - switch (bits) - { - case 64: puts ("hppa2.0w"); break; - case 32: puts ("hppa2.0n"); break; - default: puts ("hppa2.0"); break; - } break; - #else /* !defined(_SC_KERNEL_BITS) */ - puts ("hppa2.0"); break; - #endif - default: puts ("hppa1.0"); break; - } - exit (0); - } -EOF - (CCOPTS= $CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null) && HP_ARCH=`$dummy` - test -z "$HP_ARCH" && HP_ARCH=hppa - fi ;; - esac - if [ ${HP_ARCH} = "hppa2.0w" ] - then - eval $set_cc_for_build - - # hppa2.0w-hp-hpux* has a 64-bit kernel and a compiler generating - # 32-bit code. hppa64-hp-hpux* has the same kernel and a compiler - # generating 64-bit code. GNU and HP use different nomenclature: - # - # $ CC_FOR_BUILD=cc ./config.guess - # => hppa2.0w-hp-hpux11.23 - # $ CC_FOR_BUILD="cc +DA2.0w" ./config.guess - # => hppa64-hp-hpux11.23 - - if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | - grep __LP64__ >/dev/null - then - HP_ARCH="hppa2.0w" - else - HP_ARCH="hppa64" - fi - fi - echo ${HP_ARCH}-hp-hpux${HPUX_REV} - exit ;; - ia64:HP-UX:*:*) - HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'` - echo ia64-hp-hpux${HPUX_REV} - exit ;; - 3050*:HI-UX:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #include <unistd.h> - int - main () - { - long cpu = sysconf (_SC_CPU_VERSION); - /* The order matters, because CPU_IS_HP_MC68K erroneously returns - true for CPU_PA_RISC1_0. CPU_IS_PA_RISC returns correct - results, however. */ - if (CPU_IS_PA_RISC (cpu)) - { - switch (cpu) - { - case CPU_PA_RISC1_0: puts ("hppa1.0-hitachi-hiuxwe2"); break; - case CPU_PA_RISC1_1: puts ("hppa1.1-hitachi-hiuxwe2"); break; - case CPU_PA_RISC2_0: puts ("hppa2.0-hitachi-hiuxwe2"); break; - default: puts ("hppa-hitachi-hiuxwe2"); break; - } - } - else if (CPU_IS_HP_MC68K (cpu)) - puts ("m68k-hitachi-hiuxwe2"); - else puts ("unknown-hitachi-hiuxwe2"); - exit (0); - } -EOF - $CC_FOR_BUILD -o $dummy $dummy.c && SYSTEM_NAME=`$dummy` && - { echo "$SYSTEM_NAME"; exit; } - echo unknown-hitachi-hiuxwe2 - exit ;; - 9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:* ) - echo hppa1.1-hp-bsd - exit ;; - 9000/8??:4.3bsd:*:*) - echo hppa1.0-hp-bsd - exit ;; - *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*) - echo hppa1.0-hp-mpeix - exit ;; - hp7??:OSF1:*:* | hp8?[79]:OSF1:*:* ) - echo hppa1.1-hp-osf - exit ;; - hp8??:OSF1:*:*) - echo hppa1.0-hp-osf - exit ;; - i*86:OSF1:*:*) - if [ -x /usr/sbin/sysversion ] ; then - echo ${UNAME_MACHINE}-unknown-osf1mk - else - echo ${UNAME_MACHINE}-unknown-osf1 - fi - exit ;; - parisc*:Lites*:*:*) - echo hppa1.1-hp-lites - exit ;; - C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*) - echo c1-convex-bsd - exit ;; - C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*) - if getsysinfo -f scalar_acc - then echo c32-convex-bsd - else echo c2-convex-bsd - fi - exit ;; - C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*) - echo c34-convex-bsd - exit ;; - C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*) - echo c38-convex-bsd - exit ;; - C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*) - echo c4-convex-bsd - exit ;; - CRAY*Y-MP:*:*:*) - echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*[A-Z]90:*:*:*) - echo ${UNAME_MACHINE}-cray-unicos${UNAME_RELEASE} \ - | sed -e 's/CRAY.*\([A-Z]90\)/\1/' \ - -e y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/ \ - -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*TS:*:*:*) - echo t90-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*T3E:*:*:*) - echo alphaev5-cray-unicosmk${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*SV1:*:*:*) - echo sv1-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - *:UNICOS/mp:*:*) - echo craynv-cray-unicosmp${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - F30[01]:UNIX_System_V:*:* | F700:UNIX_System_V:*:*) - FUJITSU_PROC=`uname -m | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'` - FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'` - FUJITSU_REL=`echo ${UNAME_RELEASE} | sed -e 's/ /_/'` - echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}" - exit ;; - 5000:UNIX_System_V:4.*:*) - FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'` - FUJITSU_REL=`echo ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'` - echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}" - exit ;; - i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*) - echo ${UNAME_MACHINE}-pc-bsdi${UNAME_RELEASE} - exit ;; - sparc*:BSD/OS:*:*) - echo sparc-unknown-bsdi${UNAME_RELEASE} - exit ;; - *:BSD/OS:*:*) - echo ${UNAME_MACHINE}-unknown-bsdi${UNAME_RELEASE} - exit ;; - *:FreeBSD:*:*) - echo ${UNAME_MACHINE}-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` - exit ;; - i*:CYGWIN*:*) - echo ${UNAME_MACHINE}-pc-cygwin - exit ;; - i*:MINGW*:*) - echo ${UNAME_MACHINE}-pc-mingw32 - exit ;; - i*:windows32*:*) - # uname -m includes "-pc" on this system. - echo ${UNAME_MACHINE}-mingw32 - exit ;; - i*:PW*:*) - echo ${UNAME_MACHINE}-pc-pw32 - exit ;; - x86:Interix*:[34]*) - echo i586-pc-interix${UNAME_RELEASE}|sed -e 's/\..*//' - exit ;; - [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*) - echo i${UNAME_MACHINE}-pc-mks - exit ;; - i*:Windows_NT*:* | Pentium*:Windows_NT*:*) - # How do we know it's Interix rather than the generic POSIX subsystem? - # It also conflicts with pre-2.0 versions of AT&T UWIN. Should we - # UNAME_MACHINE based on the output of uname instead of i386? - echo i586-pc-interix - exit ;; - i*:UWIN*:*) - echo ${UNAME_MACHINE}-pc-uwin - exit ;; - amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*) - echo x86_64-unknown-cygwin - exit ;; - p*:CYGWIN*:*) - echo powerpcle-unknown-cygwin - exit ;; - prep*:SunOS:5.*:*) - echo powerpcle-unknown-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'` - exit ;; - *:GNU:*:*) - # the GNU system - echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'` - exit ;; - *:GNU/*:*:*) - # other systems with GNU libc and userland - echo ${UNAME_MACHINE}-unknown-`echo ${UNAME_SYSTEM} | sed 's,^[^/]*/,,' | tr '[A-Z]' '[a-z]'``echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-gnu - exit ;; - i*86:Minix:*:*) - echo ${UNAME_MACHINE}-pc-minix - exit ;; - arm*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - cris:Linux:*:*) - echo cris-axis-linux-gnu - exit ;; - crisv32:Linux:*:*) - echo crisv32-axis-linux-gnu - exit ;; - frv:Linux:*:*) - echo frv-unknown-linux-gnu - exit ;; - ia64:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - m32r*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - m68*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - mips:Linux:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #undef CPU - #undef mips - #undef mipsel - #if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL) - CPU=mipsel - #else - #if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB) - CPU=mips - #else - CPU= - #endif - #endif -EOF - eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=` - test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; } - ;; - mips64:Linux:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #undef CPU - #undef mips64 - #undef mips64el - #if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL) - CPU=mips64el - #else - #if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB) - CPU=mips64 - #else - CPU= - #endif - #endif -EOF - eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=` - test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; } - ;; - or32:Linux:*:*) - echo or32-unknown-linux-gnu - exit ;; - ppc:Linux:*:*) - echo powerpc-unknown-linux-gnu - exit ;; - ppc64:Linux:*:*) - echo powerpc64-unknown-linux-gnu - exit ;; - alpha:Linux:*:*) - case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in - EV5) UNAME_MACHINE=alphaev5 ;; - EV56) UNAME_MACHINE=alphaev56 ;; - PCA56) UNAME_MACHINE=alphapca56 ;; - PCA57) UNAME_MACHINE=alphapca56 ;; - EV6) UNAME_MACHINE=alphaev6 ;; - EV67) UNAME_MACHINE=alphaev67 ;; - EV68*) UNAME_MACHINE=alphaev68 ;; - esac - objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null - if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi - echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC} - exit ;; - parisc:Linux:*:* | hppa:Linux:*:*) - # Look for CPU level - case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in - PA7*) echo hppa1.1-unknown-linux-gnu ;; - PA8*) echo hppa2.0-unknown-linux-gnu ;; - *) echo hppa-unknown-linux-gnu ;; - esac - exit ;; - parisc64:Linux:*:* | hppa64:Linux:*:*) - echo hppa64-unknown-linux-gnu - exit ;; - s390:Linux:*:* | s390x:Linux:*:*) - echo ${UNAME_MACHINE}-ibm-linux - exit ;; - sh64*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - sh*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - sparc:Linux:*:* | sparc64:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - x86_64:Linux:*:*) - echo x86_64-unknown-linux-gnu - exit ;; - i*86:Linux:*:*) - # The BFD linker knows what the default object file format is, so - # first see if it will tell us. cd to the root directory to prevent - # problems with other programs or directories called `ld' in the path. - # Set LC_ALL=C to ensure ld outputs messages in English. - ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \ - | sed -ne '/supported targets:/!d - s/[ ][ ]*/ /g - s/.*supported targets: *// - s/ .*// - p'` - case "$ld_supported_targets" in - elf32-i386) - TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu" - ;; - a.out-i386-linux) - echo "${UNAME_MACHINE}-pc-linux-gnuaout" - exit ;; - coff-i386) - echo "${UNAME_MACHINE}-pc-linux-gnucoff" - exit ;; 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do \ - $(help2man) --name='$(PACKAGE_NAME)' \ - --section=`echo $$i | sed -e 's/.*\.\([^.]*\)$$/\1/'` \ - ../flex$(EXEEXT) > $$i || rm -f $$i ; \ - done -# Tell versions [3.59,3.63) of GNU make to not export all variables. -# Otherwise a system limit (for SysV at least) may be exceeded. -.NOEXPORT: diff --git a/doc/flex.1 b/doc/flex.1 deleted file mode 100644 index a55e8b8..0000000 --- a/doc/flex.1 +++ /dev/null @@ -1,165 +0,0 @@ -.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.36. -.TH FLEX "1" "February 2008" "flex 2.5.35" "User Commands" -.SH NAME -flex \- the fast lexical analyser generator -.SH SYNOPSIS -.B flex -[\fIOPTIONS\fR] [\fIFILE\fR]... -.SH DESCRIPTION -Generates programs that perform pattern\-matching on text. -.SS "Table Compression:" -.TP -\fB\-Ca\fR, \fB\-\-align\fR -trade off larger tables for better memory alignment -.TP -\fB\-Ce\fR, \fB\-\-ecs\fR -construct equivalence classes -.TP -\fB\-Cf\fR -do not compress tables; use \fB\-f\fR representation -.TP -\fB\-CF\fR -do not compress tables; use \fB\-F\fR representation -.TP -\fB\-Cm\fR, \fB\-\-meta\-ecs\fR -construct meta\-equivalence classes -.TP -\fB\-Cr\fR, \fB\-\-read\fR -use read() instead of stdio for scanner input -.TP -\fB\-f\fR, \fB\-\-full\fR -generate fast, large scanner. Same as \fB\-Cfr\fR -.TP -\fB\-F\fR, \fB\-\-fast\fR -use alternate table representation. Same as \fB\-CFr\fR -.TP -\fB\-Cem\fR -default compression (same as \fB\-\-ecs\fR \fB\-\-meta\-ecs\fR) -.SS "Debugging:" -.TP -\fB\-d\fR, \fB\-\-debug\fR -enable debug mode in scanner -.TP -\fB\-b\fR, \fB\-\-backup\fR -write backing\-up information to lex.backup -.TP -\fB\-p\fR, \fB\-\-perf\-report\fR -write performance report to stderr -.TP -\fB\-s\fR, \fB\-\-nodefault\fR -suppress default rule to ECHO unmatched text -.TP -\fB\-T\fR, \fB\-\-trace\fR -flex should run in trace mode -.TP -\fB\-w\fR, \fB\-\-nowarn\fR -do not generate warnings -.TP -\fB\-v\fR, \fB\-\-verbose\fR -write summary of scanner statistics to stdout -.SS "Files:" -.TP -\fB\-o\fR, \fB\-\-outfile\fR=\fIFILE\fR -specify output filename -.TP -\fB\-S\fR, \fB\-\-skel\fR=\fIFILE\fR -specify skeleton file -.TP -\fB\-t\fR, \fB\-\-stdout\fR -write scanner on stdout instead of lex.yy.c -.TP -\fB\-\-yyclass\fR=\fINAME\fR -name of C++ class -.TP -\fB\-\-header\-file\fR=\fIFILE\fR -create a C header file in addition to the scanner -.HP -\fB\-\-tables\-file\fR[=\fIFILE\fR] write tables to FILE -.SS "Scanner behavior:" -.TP -\fB\-7\fR, \fB\-\-7bit\fR -generate 7\-bit scanner -.TP -\fB\-8\fR, \fB\-\-8bit\fR -generate 8\-bit scanner -.TP -\fB\-B\fR, \fB\-\-batch\fR -generate batch scanner (opposite of \fB\-I\fR) -.TP -\fB\-i\fR, \fB\-\-case\-insensitive\fR -ignore case in patterns -.TP -\fB\-l\fR, \fB\-\-lex\-compat\fR -maximal compatibility with original lex -.TP -\fB\-X\fR, \fB\-\-posix\-compat\fR -maximal compatibility with POSIX lex -.TP -\fB\-I\fR, \fB\-\-interactive\fR -generate interactive scanner (opposite of \fB\-B\fR) -.TP -\fB\-\-yylineno\fR -track line count in yylineno -.SS "Generated code:" -.TP -\-+, \fB\-\-c\fR++ -generate C++ scanner class -.TP -\fB\-Dmacro\fR[=\fIdefn\fR] -#define macro defn (default defn is '1') -.TP -\fB\-L\fR, \fB\-\-noline\fR -suppress #line directives in scanner -.TP -\fB\-P\fR, \fB\-\-prefix\fR=\fISTRING\fR -use STRING as prefix instead of "yy" -.TP -\fB\-R\fR, \fB\-\-reentrant\fR -generate a reentrant C scanner -.TP -\fB\-\-bison\-bridge\fR -scanner for bison pure parser. -.TP -\fB\-\-bison\-locations\fR -include yylloc support. -.TP -\fB\-\-stdinit\fR -initialize yyin/yyout to stdin/stdout -.HP -\fB\-\-noansi\-definitions\fR old\-style function definitions -.TP -\fB\-\-noansi\-prototypes\fR -empty parameter list in prototypes -.TP -\fB\-\-nounistd\fR -do not include <unistd.h> -.TP -\fB\-\-noFUNCTION\fR -do not generate a particular FUNCTION -.SS "Miscellaneous:" -.TP -\fB\-c\fR -do\-nothing POSIX option -.TP -\fB\-n\fR -do\-nothing POSIX option -.HP -\-? -.TP -\fB\-h\fR, \fB\-\-help\fR -produce this help message -.TP -\fB\-V\fR, \fB\-\-version\fR -report flex version -.SH "SEE ALSO" -The full documentation for -.B flex -is maintained as a Texinfo manual. If the -.B info -and -.B flex -programs are properly installed at your site, the command -.IP -.B info flex -.PP -should give you access to the complete manual. diff --git a/doc/flex.info b/doc/flex.info deleted file mode 100644 index fddd792..0000000 --- a/doc/flex.info +++ /dev/null @@ -1,282 +0,0 @@ -This is flex.info, produced by makeinfo version 4.8 from flex.texi. - -INFO-DIR-SECTION Programming -START-INFO-DIR-ENTRY -* flex: (flex). Fast lexical analyzer generator (lex replacement). -END-INFO-DIR-ENTRY - - The flex manual is placed under the same licensing conditions as the -rest of flex: - - Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The Flex -Project. - - Copyright (C) 1990, 1997 The Regents of the University of California. -All rights reserved. - - This code is derived from software contributed to Berkeley by Vern -Paxson. - - The United States Government has rights in this work pursuant to -contract no. DE-AC03-76SF00098 between the United States Department of -Energy and the University of California. - - Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the - distribution. - - Neither the name of the University nor the names of its contributors -may be used to endorse or promote products derived from this software -without specific prior written permission. - - THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED -WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF -MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - - -Indirect: -flex.info-1: 1620 -flex.info-2: 287921 - -Tag Table: -(Indirect) -Node: Top1620 -Node: Copyright7690 -Node: Reporting Bugs9203 -Node: Introduction9508 -Node: Simple Examples10336 -Node: Format13646 -Node: Definitions Section14060 -Ref: Definitions Section-Footnote-116323 -Node: Rules Section16391 -Node: User Code Section17549 -Node: Comments in the Input17987 -Node: Patterns19355 -Ref: case and character ranges26186 -Node: Matching30201 -Node: Actions33487 -Node: Generated Scanner42466 -Node: Start Conditions47484 -Node: Multiple Input Buffers58043 -Ref: Scanning Strings64581 -Node: EOF66211 -Node: Misc Macros67799 -Node: User Values70653 -Node: Yacc72984 -Node: Scanner Options73880 -Node: Options for Specifying Filenames76638 -Ref: option-header76864 -Ref: option-outfile77576 -Ref: option-stdout77901 -Node: Options Affecting Scanner Behavior78883 -Ref: option-case-insensitive79124 -Ref: option-lex-compat79557 -Ref: option-batch80089 -Ref: option-interactive80613 -Ref: option-7bit81967 -Ref: option-8bit83271 -Ref: option-default83683 -Ref: option-always-interactive83747 -Ref: option-posix84351 -Ref: option-stack85498 -Ref: option-stdinit85606 -Ref: option-yylineno86084 -Ref: option-yywrap86527 -Node: Code-Level And API Options86795 -Ref: option-ansi-definitions87022 -Ref: option-ansi-prototypes87274 -Ref: option-bison-bridge87521 -Ref: option-bison-locations87860 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Functions126906 -Node: Accessor Methods129418 -Node: Extra Data130762 -Node: About yyscan_t133029 -Node: Reentrant Functions133425 -Ref: bison-functions134909 -Node: Lex and Posix135650 -Node: Memory Management143034 -Ref: memory-management143180 -Node: The Default Memory Management143408 -Ref: The Default Memory Management-Footnote-1147217 -Node: Overriding The Default Memory Management147370 -Ref: Overriding The Default Memory Management-Footnote-1149769 -Node: A Note About yytext And Memory149933 -Node: Serialized Tables151166 -Ref: serialization151310 -Node: Creating Serialized Tables152075 -Node: Loading and Unloading Serialized Tables153685 -Node: Tables File Format155453 -Node: Diagnostics162468 -Node: Limitations165879 -Node: Bibliography167828 -Node: FAQ168501 -Node: When was flex born?172741 -Node: How do I expand backslash-escape sequences in C-style quoted strings?173118 -Node: Why do flex scanners call fileno if it is not ANSI compatible?174422 -Node: Does flex support recursive pattern definitions?175217 -Node: How do I skip huge chunks of input (tens of megabytes) while using flex?176064 -Node: Flex is not matching my patterns in the same order that I defined them.176531 -Node: My actions are executing out of order or sometimes not at all.178277 -Node: How can I have multiple input sources feed into the same scanner at the same time?179052 -Node: Can I build nested parsers that work with the same input file?181040 -Node: How can I match text only at the end of a file?182046 -Node: How can I make REJECT cascade across start condition boundaries?182851 -Node: Why cant I use fast or full tables with interactive mode?183866 -Node: How much faster is -F or -f than -C?185124 -Node: If I have a simple grammar cant I just parse it with flex?185436 -Node: Why doesn't yyrestart() set the start state back to INITIAL?185917 -Node: How can I match C-style comments?186544 -Node: The period isn't working the way I expected.187358 -Node: Can I get the flex manual in another format?188605 -Node: Does there exist a "faster" NDFA->DFA algorithm?189094 -Node: How does flex compile the DFA so quickly?189604 -Node: How can I use more than 8192 rules?190571 -Node: How do I abandon a file in the middle of a scan and switch to a new file?191983 -Node: How do I execute code only during initialization (only before the first scan)?192536 -Node: How do I execute code at termination?193314 -Node: Where else can I find help?193640 -Node: Can I include comments in the "rules" section of the file?194013 -Node: I get an error about undefined yywrap().194392 -Node: How can I change the matching pattern at run time?194869 -Node: How can I expand macros in the input?195231 -Node: How can I build a two-pass scanner?196264 -Node: How do I match any string not matched in the preceding rules?197180 -Node: I am trying to port code from AT&T lex that uses yysptr and yysbuf.198090 -Node: Is there a way to make flex treat NULL like a regular character?198885 -Node: Whenever flex can not match the input it says "flex scanner jammed".199406 -Node: Why doesn't flex have non-greedy operators like perl does?200050 -Node: Memory leak - 16386 bytes allocated by malloc.201403 -Ref: faq-memory-leak201701 -Node: How do I track the byte offset for lseek()?202669 -Node: How do I use my own I/O classes in a C++ scanner?204180 -Node: How do I skip as many chars as possible?205023 -Node: deleteme00206100 -Node: Are certain equivalent patterns faster than others?206541 -Node: Is backing up a big deal?209960 -Node: Can I fake multi-byte character support?211867 -Node: deleteme01213309 -Node: Can you discuss some flex internals?214419 -Node: unput() messes up yy_at_bol216664 -Node: The | operator is not doing what I want217767 -Node: Why can't flex understand this variable trailing context pattern?219314 -Node: The ^ operator isn't working220564 -Node: Trailing context is getting confused with trailing optional patterns221800 -Node: Is flex GNU or not?223044 -Node: ERASEME53224718 -Node: I need to scan if-then-else blocks and while loops225489 -Node: ERASEME55226689 -Node: ERASEME56227788 -Node: ERASEME57229147 -Node: Is there a repository for flex scanners?230146 -Node: How can I conditionally compile or preprocess my flex input file?230461 -Node: Where can I find grammars for lex and yacc?230934 -Node: I get an end-of-buffer message for each character scanned.231281 -Node: unnamed-faq-62231876 -Node: unnamed-faq-63232895 -Node: unnamed-faq-64234193 -Node: unnamed-faq-65235160 -Node: unnamed-faq-66235947 -Node: unnamed-faq-67237063 -Node: unnamed-faq-68238051 -Node: unnamed-faq-69239194 -Node: unnamed-faq-70239908 -Node: unnamed-faq-71240670 -Node: unnamed-faq-72241880 -Node: unnamed-faq-73242924 -Node: unnamed-faq-74243849 -Node: unnamed-faq-75244795 -Node: unnamed-faq-76245928 -Node: unnamed-faq-77246635 -Node: unnamed-faq-78247529 -Node: unnamed-faq-79248528 -Node: unnamed-faq-80250229 -Node: unnamed-faq-81251548 -Node: unnamed-faq-82254349 -Node: unnamed-faq-83255307 -Node: unnamed-faq-84257088 -Node: unnamed-faq-85258192 -Node: unnamed-faq-86259200 -Node: unnamed-faq-87260139 -Node: unnamed-faq-88260786 -Node: unnamed-faq-90261618 -Node: unnamed-faq-91262882 -Node: unnamed-faq-92265311 -Node: unnamed-faq-93265811 -Node: unnamed-faq-94266739 -Node: unnamed-faq-95268152 -Node: unnamed-faq-96269671 -Node: unnamed-faq-97270431 -Node: unnamed-faq-98271099 -Node: unnamed-faq-99271765 -Node: unnamed-faq-100272695 -Node: unnamed-faq-101273406 -Node: What is the difference between YYLEX_PARAM and YY_DECL?274220 -Node: Why do I get "conflicting types for yylex" error?274742 -Node: How do I access the values set in a Flex action from within a Bison action?275272 -Node: Appendices275703 -Node: Makefiles and Flex275912 -Ref: Makefiles and Flex-Footnote-1279112 -Ref: Makefiles and Flex-Footnote-2279229 -Ref: Makefiles and Flex-Footnote-3279415 -Node: Bison Bridge279466 -Ref: Bison Bridge-Footnote-1282135 -Node: M4 Dependency282327 -Ref: M4 Dependency-Footnote-1283732 -Node: Common Patterns283867 -Node: Numbers284158 -Node: Identifiers285135 -Node: Quoted Constructs285964 -Node: Addresses287017 -Node: Indices287683 -Node: Concept Index287921 -Node: Index of Functions and Macros313204 -Node: Index of Variables318100 -Node: Index of Data Types319766 -Node: Index of Hooks320654 -Node: Index of Scanner Options321222 - -End Tag Table diff --git a/doc/flex.info-1 b/doc/flex.info-1 deleted file mode 100644 index 25f61b3..0000000 --- a/doc/flex.info-1 +++ /dev/null @@ -1,7683 +0,0 @@ -This is flex.info, produced by makeinfo version 4.8 from flex.texi. - -INFO-DIR-SECTION Programming -START-INFO-DIR-ENTRY -* flex: (flex). Fast lexical analyzer generator (lex replacement). -END-INFO-DIR-ENTRY - - The flex manual is placed under the same licensing conditions as the -rest of flex: - - Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The Flex -Project. - - Copyright (C) 1990, 1997 The Regents of the University of California. -All rights reserved. - - This code is derived from software contributed to Berkeley by Vern -Paxson. - - The United States Government has rights in this work pursuant to -contract no. DE-AC03-76SF00098 between the United States Department of -Energy and the University of California. - - Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the - distribution. - - Neither the name of the University nor the names of its contributors -may be used to endorse or promote products derived from this software -without specific prior written permission. - - THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED -WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF -MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - - -File: flex.info, Node: Top, Next: Copyright, Prev: (dir), Up: (dir) - -flex -**** - -This manual describes `flex', a tool for generating programs that -perform pattern-matching on text. The manual includes both tutorial and -reference sections. - - This edition of `The flex Manual' documents `flex' version 2.5.35. -It was last updated on 10 September 2007. - - This manual was written by Vern Paxson, Will Estes and John Millaway. - -* Menu: - -* Copyright:: -* Reporting Bugs:: -* Introduction:: -* Simple Examples:: -* Format:: -* Patterns:: -* Matching:: -* Actions:: -* Generated Scanner:: -* Start Conditions:: -* Multiple Input Buffers:: -* EOF:: -* Misc Macros:: -* User Values:: -* Yacc:: -* Scanner Options:: -* Performance:: -* Cxx:: -* Reentrant:: -* Lex and Posix:: -* Memory Management:: -* Serialized Tables:: -* Diagnostics:: -* Limitations:: -* Bibliography:: -* FAQ:: -* Appendices:: -* Indices:: - - --- The Detailed Node Listing --- - -Format of the Input File - -* Definitions Section:: -* Rules Section:: -* User Code Section:: -* Comments in the Input:: - -Scanner Options - -* Options for Specifying Filenames:: -* Options Affecting Scanner Behavior:: -* Code-Level And API Options:: -* Options for Scanner Speed and Size:: -* Debugging Options:: -* Miscellaneous Options:: - -Reentrant C Scanners - -* Reentrant Uses:: -* Reentrant Overview:: -* Reentrant Example:: -* Reentrant Detail:: -* Reentrant Functions:: - -The Reentrant API in Detail - -* Specify Reentrant:: -* Extra Reentrant Argument:: -* Global Replacement:: -* Init and Destroy Functions:: -* Accessor Methods:: -* Extra Data:: -* About yyscan_t:: - -Memory Management - -* The Default Memory Management:: -* Overriding The Default Memory Management:: -* A Note About yytext And Memory:: - -Serialized Tables - -* Creating Serialized Tables:: -* Loading and Unloading Serialized Tables:: -* Tables File Format:: - -FAQ - -* When was flex born?:: -* How do I expand backslash-escape sequences in C-style quoted strings?:: -* Why do flex scanners call fileno if it is not ANSI compatible?:: -* Does flex support recursive pattern definitions?:: -* How do I skip huge chunks of input (tens of megabytes) while using flex?:: -* Flex is not matching my patterns in the same order that I defined them.:: -* My actions are executing out of order or sometimes not at all.:: -* How can I have multiple input sources feed into the same scanner at the same time?:: -* Can I build nested parsers that work with the same input file?:: -* How can I match text only at the end of a file?:: -* How can I make REJECT cascade across start condition boundaries?:: -* Why cant I use fast or full tables with interactive mode?:: -* How much faster is -F or -f than -C?:: -* If I have a simple grammar cant I just parse it with flex?:: -* Why doesn't yyrestart() set the start state back to INITIAL?:: -* How can I match C-style comments?:: -* The period isn't working the way I expected.:: -* Can I get the flex manual in another format?:: -* Does there exist a "faster" NDFA->DFA algorithm?:: -* How does flex compile the DFA so quickly?:: -* How can I use more than 8192 rules?:: -* How do I abandon a file in the middle of a scan and switch to a new file?:: -* How do I execute code only during initialization (only before the first scan)?:: -* How do I execute code at termination?:: -* Where else can I find help?:: -* Can I include comments in the "rules" section of the file?:: -* I get an error about undefined yywrap().:: -* How can I change the matching pattern at run time?:: -* How can I expand macros in the input?:: -* How can I build a two-pass scanner?:: -* How do I match any string not matched in the preceding rules?:: -* I am trying to port code from AT&T lex that uses yysptr and yysbuf.:: -* Is there a way to make flex treat NULL like a regular character?:: -* Whenever flex can not match the input it says "flex scanner jammed".:: -* Why doesn't flex have non-greedy operators like perl does?:: -* Memory leak - 16386 bytes allocated by malloc.:: -* How do I track the byte offset for lseek()?:: -* How do I use my own I/O classes in a C++ scanner?:: -* How do I skip as many chars as possible?:: -* deleteme00:: -* Are certain equivalent patterns faster than others?:: -* Is backing up a big deal?:: -* Can I fake multi-byte character support?:: -* deleteme01:: -* Can you discuss some flex internals?:: -* unput() messes up yy_at_bol:: -* The | operator is not doing what I want:: -* Why can't flex understand this variable trailing context pattern?:: -* The ^ operator isn't working:: -* Trailing context is getting confused with trailing optional patterns:: -* Is flex GNU or not?:: -* ERASEME53:: -* I need to scan if-then-else blocks and while loops:: -* ERASEME55:: -* ERASEME56:: -* ERASEME57:: -* Is there a repository for flex scanners?:: -* How can I conditionally compile or preprocess my flex input file?:: -* Where can I find grammars for lex and yacc?:: -* I get an end-of-buffer message for each character scanned.:: -* unnamed-faq-62:: -* unnamed-faq-63:: -* unnamed-faq-64:: -* unnamed-faq-65:: -* unnamed-faq-66:: -* unnamed-faq-67:: -* unnamed-faq-68:: -* unnamed-faq-69:: -* unnamed-faq-70:: -* unnamed-faq-71:: -* unnamed-faq-72:: -* unnamed-faq-73:: -* unnamed-faq-74:: -* unnamed-faq-75:: -* unnamed-faq-76:: -* unnamed-faq-77:: -* unnamed-faq-78:: -* unnamed-faq-79:: -* unnamed-faq-80:: -* unnamed-faq-81:: -* unnamed-faq-82:: -* unnamed-faq-83:: -* unnamed-faq-84:: -* unnamed-faq-85:: -* unnamed-faq-86:: -* unnamed-faq-87:: -* unnamed-faq-88:: -* unnamed-faq-90:: -* unnamed-faq-91:: -* unnamed-faq-92:: -* unnamed-faq-93:: -* unnamed-faq-94:: -* unnamed-faq-95:: -* unnamed-faq-96:: -* unnamed-faq-97:: -* unnamed-faq-98:: -* unnamed-faq-99:: -* unnamed-faq-100:: -* unnamed-faq-101:: -* What is the difference between YYLEX_PARAM and YY_DECL?:: -* Why do I get "conflicting types for yylex" error?:: -* How do I access the values set in a Flex action from within a Bison action?:: - -Appendices - -* Makefiles and Flex:: -* Bison Bridge:: -* M4 Dependency:: -* Common Patterns:: - -Indices - -* Concept Index:: -* Index of Functions and Macros:: -* Index of Variables:: -* Index of Data Types:: -* Index of Hooks:: -* Index of Scanner Options:: - - -File: flex.info, Node: Copyright, Next: Reporting Bugs, Prev: Top, Up: Top - -1 Copyright -*********** - -The flex manual is placed under the same licensing conditions as the -rest of flex: - - Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The Flex -Project. - - Copyright (C) 1990, 1997 The Regents of the University of California. -All rights reserved. - - This code is derived from software contributed to Berkeley by Vern -Paxson. - - The United States Government has rights in this work pursuant to -contract no. DE-AC03-76SF00098 between the United States Department of -Energy and the University of California. - - Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the - distribution. - - Neither the name of the University nor the names of its contributors -may be used to endorse or promote products derived from this software -without specific prior written permission. - - THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED -WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF -MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - - -File: flex.info, Node: Reporting Bugs, Next: Introduction, Prev: Copyright, Up: Top - -2 Reporting Bugs -**************** - -If you find a bug in `flex', please report it using the SourceForge Bug -Tracking facilities which can be found on flex's SourceForge Page -(http://sourceforge.net/projects/flex). - - -File: flex.info, Node: Introduction, Next: Simple Examples, Prev: Reporting Bugs, Up: Top - -3 Introduction -************** - -`flex' is a tool for generating "scanners". A scanner is a program -which recognizes lexical patterns in text. The `flex' program reads -the given input files, or its standard input if no file names are -given, for a description of a scanner to generate. The description is -in the form of pairs of regular expressions and C code, called "rules". -`flex' generates as output a C source file, `lex.yy.c' by default, -which defines a routine `yylex()'. This file can be compiled and -linked with the flex runtime library to produce an executable. When -the executable is run, it analyzes its input for occurrences of the -regular expressions. Whenever it finds one, it executes the -corresponding C code. - - -File: flex.info, Node: Simple Examples, Next: Format, Prev: Introduction, Up: Top - -4 Some Simple Examples -********************** - -First some simple examples to get the flavor of how one uses `flex'. - - The following `flex' input specifies a scanner which, when it -encounters the string `username' will replace it with the user's login -name: - - - %% - username printf( "%s", getlogin() ); - - By default, any text not matched by a `flex' scanner is copied to -the output, so the net effect of this scanner is to copy its input file -to its output with each occurrence of `username' expanded. In this -input, there is just one rule. `username' is the "pattern" and the -`printf' is the "action". The `%%' symbol marks the beginning of the -rules. - - Here's another simple example: - - - int num_lines = 0, num_chars = 0; - - %% - \n ++num_lines; ++num_chars; - . ++num_chars; - - %% - main() - { - yylex(); - printf( "# of lines = %d, # of chars = %d\n", - num_lines, num_chars ); - } - - This scanner counts the number of characters and the number of lines -in its input. It produces no output other than the final report on the -character and line counts. The first line declares two globals, -`num_lines' and `num_chars', which are accessible both inside `yylex()' -and in the `main()' routine declared after the second `%%'. There are -two rules, one which matches a newline (`\n') and increments both the -line count and the character count, and one which matches any character -other than a newline (indicated by the `.' regular expression). - - A somewhat more complicated example: - - - /* scanner for a toy Pascal-like language */ - - %{ - /* need this for the call to atof() below */ - #include math.h> - %} - - DIGIT [0-9] - ID [a-z][a-z0-9]* - - %% - - {DIGIT}+ { - printf( "An integer: %s (%d)\n", yytext, - atoi( yytext ) ); - } - - {DIGIT}+"."{DIGIT}* { - printf( "A float: %s (%g)\n", yytext, - atof( yytext ) ); - } - - if|then|begin|end|procedure|function { - printf( "A keyword: %s\n", yytext ); - } - - {ID} printf( "An identifier: %s\n", yytext ); - - "+"|"-"|"*"|"/" printf( "An operator: %s\n", yytext ); - - "{"[\^{}}\n]*"}" /* eat up one-line comments */ - - [ \t\n]+ /* eat up whitespace */ - - . printf( "Unrecognized character: %s\n", yytext ); - - %% - - main( argc, argv ) - int argc; - char **argv; - { - ++argv, --argc; /* skip over program name */ - if ( argc > 0 ) - yyin = fopen( argv[0], "r" ); - else - yyin = stdin; - - yylex(); - } - - This is the beginnings of a simple scanner for a language like -Pascal. It identifies different types of "tokens" and reports on what -it has seen. - - The details of this example will be explained in the following -sections. - - -File: flex.info, Node: Format, Next: Patterns, Prev: Simple Examples, Up: Top - -5 Format of the Input File -************************** - -The `flex' input file consists of three sections, separated by a line -containing only `%%'. - - - definitions - %% - rules - %% - user code - -* Menu: - -* Definitions Section:: -* Rules Section:: -* User Code Section:: -* Comments in the Input:: - - -File: flex.info, Node: Definitions Section, Next: Rules Section, Prev: Format, Up: Format - -5.1 Format of the Definitions Section -===================================== - -The "definitions section" contains declarations of simple "name" -definitions to simplify the scanner specification, and declarations of -"start conditions", which are explained in a later section. - - Name definitions have the form: - - - name definition - - The `name' is a word beginning with a letter or an underscore (`_') -followed by zero or more letters, digits, `_', or `-' (dash). The -definition is taken to begin at the first non-whitespace character -following the name and continuing to the end of the line. The -definition can subsequently be referred to using `{name}', which will -expand to `(definition)'. For example, - - - DIGIT [0-9] - ID [a-z][a-z0-9]* - - Defines `DIGIT' to be a regular expression which matches a single -digit, and `ID' to be a regular expression which matches a letter -followed by zero-or-more letters-or-digits. A subsequent reference to - - - {DIGIT}+"."{DIGIT}* - - is identical to - - - ([0-9])+"."([0-9])* - - and matches one-or-more digits followed by a `.' followed by -zero-or-more digits. - - An unindented comment (i.e., a line beginning with `/*') is copied -verbatim to the output up to the next `*/'. - - Any _indented_ text or text enclosed in `%{' and `%}' is also copied -verbatim to the output (with the %{ and %} symbols removed). The %{ -and %} symbols must appear unindented on lines by themselves. - - A `%top' block is similar to a `%{' ... `%}' block, except that the -code in a `%top' block is relocated to the _top_ of the generated file, -before any flex definitions (1). The `%top' block is useful when you -want certain preprocessor macros to be defined or certain files to be -included before the generated code. The single characters, `{' and -`}' are used to delimit the `%top' block, as show in the example below: - - - %top{ - /* This code goes at the "top" of the generated file. */ - #include <stdint.h> - #include <inttypes.h> - } - - Multiple `%top' blocks are allowed, and their order is preserved. - - ---------- Footnotes ---------- - - (1) Actually, `yyIN_HEADER' is defined before the `%top' block. - - -File: flex.info, Node: Rules Section, Next: User Code Section, Prev: Definitions Section, Up: Format - -5.2 Format of the Rules Section -=============================== - -The "rules" section of the `flex' input contains a series of rules of -the form: - - - pattern action - - where the pattern must be unindented and the action must begin on -the same line. *Note Patterns::, for a further description of patterns -and actions. - - In the rules section, any indented or %{ %} enclosed text appearing -before the first rule may be used to declare variables which are local -to the scanning routine and (after the declarations) code which is to be -executed whenever the scanning routine is entered. Other indented or -%{ %} text in the rule section is still copied to the output, but its -meaning is not well-defined and it may well cause compile-time errors -(this feature is present for POSIX compliance. *Note Lex and Posix::, -for other such features). - - Any _indented_ text or text enclosed in `%{' and `%}' is copied -verbatim to the output (with the %{ and %} symbols removed). The %{ -and %} symbols must appear unindented on lines by themselves. - - -File: flex.info, Node: User Code Section, Next: Comments in the Input, Prev: Rules Section, Up: Format - -5.3 Format of the User Code Section -=================================== - -The user code section is simply copied to `lex.yy.c' verbatim. It is -used for companion routines which call or are called by the scanner. -The presence of this section is optional; if it is missing, the second -`%%' in the input file may be skipped, too. - - -File: flex.info, Node: Comments in the Input, Prev: User Code Section, Up: Format - -5.4 Comments in the Input -========================= - -Flex supports C-style comments, that is, anything between `/*' and `*/' -is considered a comment. Whenever flex encounters a comment, it copies -the entire comment verbatim to the generated source code. Comments may -appear just about anywhere, but with the following exceptions: - - * Comments may not appear in the Rules Section wherever flex is - expecting a regular expression. This means comments may not appear - at the beginning of a line, or immediately following a list of - scanner states. - - * Comments may not appear on an `%option' line in the Definitions - Section. - - If you want to follow a simple rule, then always begin a comment on a -new line, with one or more whitespace characters before the initial -`/*'). This rule will work anywhere in the input file. - - All the comments in the following example are valid: - - - %{ - /* code block */ - %} - - /* Definitions Section */ - %x STATE_X - - %% - /* Rules Section */ - ruleA /* after regex */ { /* code block */ } /* after code block */ - /* Rules Section (indented) */ - <STATE_X>{ - ruleC ECHO; - ruleD ECHO; - %{ - /* code block */ - %} - } - %% - /* User Code Section */ - - -File: flex.info, Node: Patterns, Next: Matching, Prev: Format, Up: Top - -6 Patterns -********** - -The patterns in the input (see *Note Rules Section::) are written using -an extended set of regular expressions. These are: - -`x' - match the character 'x' - -`.' - any character (byte) except newline - -`[xyz]' - a "character class"; in this case, the pattern matches either an - 'x', a 'y', or a 'z' - -`[abj-oZ]' - a "character class" with a range in it; matches an 'a', a 'b', any - letter from 'j' through 'o', or a 'Z' - -`[^A-Z]' - a "negated character class", i.e., any character but those in the - class. In this case, any character EXCEPT an uppercase letter. - -`[^A-Z\n]' - any character EXCEPT an uppercase letter or a newline - -`[a-z]{-}[aeiou]' - the lowercase consonants - -`r*' - zero or more r's, where r is any regular expression - -`r+' - one or more r's - -`r?' - zero or one r's (that is, "an optional r") - -`r{2,5}' - anywhere from two to five r's - -`r{2,}' - two or more r's - -`r{4}' - exactly 4 r's - -`{name}' - the expansion of the `name' definition (*note Format::). - -`"[xyz]\"foo"' - the literal string: `[xyz]"foo' - -`\X' - if X is `a', `b', `f', `n', `r', `t', or `v', then the ANSI-C - interpretation of `\x'. Otherwise, a literal `X' (used to escape - operators such as `*') - -`\0' - a NUL character (ASCII code 0) - -`\123' - the character with octal value 123 - -`\x2a' - the character with hexadecimal value 2a - -`(r)' - match an `r'; parentheses are used to override precedence (see - below) - -`(?r-s:pattern)' - apply option `r' and omit option `s' while interpreting pattern. - Options may be zero or more of the characters `i', `s', or `x'. - - `i' means case-insensitive. `-i' means case-sensitive. - - `s' alters the meaning of the `.' syntax to match any single byte - whatsoever. `-s' alters the meaning of `.' to match any byte - except `\n'. - - `x' ignores comments and whitespace in patterns. Whitespace is - ignored unless it is backslash-escaped, contained within `""'s, or - appears inside a character class. - - The following are all valid: - - - (?:foo) same as (foo) - (?i:ab7) same as ([aA][bB]7) - (?-i:ab) same as (ab) - (?s:.) same as [\x00-\xFF] - (?-s:.) same as [^\n] - (?ix-s: a . b) same as ([Aa][^\n][bB]) - (?x:a b) same as ("ab") - (?x:a\ b) same as ("a b") - (?x:a" "b) same as ("a b") - (?x:a[ ]b) same as ("a b") - (?x:a - /* comment */ - b - c) same as (abc) - -`(?# comment )' - omit everything within `()'. The first `)' character encountered - ends the pattern. It is not possible to for the comment to contain - a `)' character. The comment may span lines. - -`rs' - the regular expression `r' followed by the regular expression `s'; - called "concatenation" - -`r|s' - either an `r' or an `s' - -`r/s' - an `r' but only if it is followed by an `s'. The text matched by - `s' is included when determining whether this rule is the longest - match, but is then returned to the input before the action is - executed. So the action only sees the text matched by `r'. This - type of pattern is called "trailing context". (There are some - combinations of `r/s' that flex cannot match correctly. *Note - Limitations::, regarding dangerous trailing context.) - -`^r' - an `r', but only at the beginning of a line (i.e., when just - starting to scan, or right after a newline has been scanned). - -`r$' - an `r', but only at the end of a line (i.e., just before a - newline). Equivalent to `r/\n'. - - Note that `flex''s notion of "newline" is exactly whatever the C - compiler used to compile `flex' interprets `\n' as; in particular, - on some DOS systems you must either filter out `\r's in the input - yourself, or explicitly use `r/\r\n' for `r$'. - -`<s>r' - an `r', but only in start condition `s' (see *Note Start - Conditions:: for discussion of start conditions). - -`<s1,s2,s3>r' - same, but in any of start conditions `s1', `s2', or `s3'. - -`<*>r' - an `r' in any start condition, even an exclusive one. - -`<<EOF>>' - an end-of-file. - -`<s1,s2><<EOF>>' - an end-of-file when in start condition `s1' or `s2' - - Note that inside of a character class, all regular expression -operators lose their special meaning except escape (`\') and the -character class operators, `-', `]]', and, at the beginning of the -class, `^'. - - The regular expressions listed above are grouped according to -precedence, from highest precedence at the top to lowest at the bottom. -Those grouped together have equal precedence (see special note on the -precedence of the repeat operator, `{}', under the documentation for -the `--posix' POSIX compliance option). For example, - - - foo|bar* - - is the same as - - - (foo)|(ba(r*)) - - since the `*' operator has higher precedence than concatenation, and -concatenation higher than alternation (`|'). This pattern therefore -matches _either_ the string `foo' _or_ the string `ba' followed by -zero-or-more `r''s. To match `foo' or zero-or-more repetitions of the -string `bar', use: - - - foo|(bar)* - - And to match a sequence of zero or more repetitions of `foo' and -`bar': - - - (foo|bar)* - - In addition to characters and ranges of characters, character classes -can also contain "character class expressions". These are expressions -enclosed inside `[': and `:]' delimiters (which themselves must appear -between the `[' and `]' of the character class. Other elements may -occur inside the character class, too). The valid expressions are: - - - [:alnum:] [:alpha:] [:blank:] - [:cntrl:] [:digit:] [:graph:] - [:lower:] [:print:] [:punct:] - [:space:] [:upper:] [:xdigit:] - - These expressions all designate a set of characters equivalent to the -corresponding standard C `isXXX' function. For example, `[:alnum:]' -designates those characters for which `isalnum()' returns true - i.e., -any alphabetic or numeric character. Some systems don't provide -`isblank()', so flex defines `[:blank:]' as a blank or a tab. - - For example, the following character classes are all equivalent: - - - [[:alnum:]] - [[:alpha:][:digit:]] - [[:alpha:][0-9]] - [a-zA-Z0-9] - - A word of caution. Character classes are expanded immediately when -seen in the `flex' input. This means the character classes are -sensitive to the locale in which `flex' is executed, and the resulting -scanner will not be sensitive to the runtime locale. This may or may -not be desirable. - - * If your scanner is case-insensitive (the `-i' flag), then - `[:upper:]' and `[:lower:]' are equivalent to `[:alpha:]'. - - * Character classes with ranges, such as `[a-Z]', should be used with - caution in a case-insensitive scanner if the range spans upper or - lowercase characters. Flex does not know if you want to fold all - upper and lowercase characters together, or if you want the - literal numeric range specified (with no case folding). When in - doubt, flex will assume that you meant the literal numeric range, - and will issue a warning. The exception to this rule is a - character range such as `[a-z]' or `[S-W]' where it is obvious - that you want case-folding to occur. Here are some examples with - the `-i' flag enabled: - - Range Result Literal Range Alternate Range - `[a-t]' ok `[a-tA-T]' - `[A-T]' ok `[a-tA-T]' - `[A-t]' ambiguous `[A-Z\[\\\]_`a-t]' `[a-tA-T]' - `[_-{]' ambiguous `[_`a-z{]' `[_`a-zA-Z{]' - `[@-C]' ambiguous `[@ABC]' `[@A-Z\[\\\]_`abc]' - - * A negated character class such as the example `[^A-Z]' above - _will_ match a newline unless `\n' (or an equivalent escape - sequence) is one of the characters explicitly present in the - negated character class (e.g., `[^A-Z\n]'). This is unlike how - many other regular expression tools treat negated character - classes, but unfortunately the inconsistency is historically - entrenched. Matching newlines means that a pattern like `[^"]*' - can match the entire input unless there's another quote in the - input. - - Flex allows negation of character class expressions by prepending - `^' to the POSIX character class name. - - - [:^alnum:] [:^alpha:] [:^blank:] - [:^cntrl:] [:^digit:] [:^graph:] - [:^lower:] [:^print:] [:^punct:] - [:^space:] [:^upper:] [:^xdigit:] - - Flex will issue a warning if the expressions `[:^upper:]' and - `[:^lower:]' appear in a case-insensitive scanner, since their - meaning is unclear. The current behavior is to skip them entirely, - but this may change without notice in future revisions of flex. - - * The `{-}' operator computes the difference of two character - classes. For example, `[a-c]{-}[b-z]' represents all the - characters in the class `[a-c]' that are not in the class `[b-z]' - (which in this case, is just the single character `a'). The `{-}' - operator is left associative, so `[abc]{-}[b]{-}[c]' is the same - as `[a]'. Be careful not to accidentally create an empty set, - which will never match. - - * The `{+}' operator computes the union of two character classes. - For example, `[a-z]{+}[0-9]' is the same as `[a-z0-9]'. This - operator is useful when preceded by the result of a difference - operation, as in, `[[:alpha:]]{-}[[:lower:]]{+}[q]', which is - equivalent to `[A-Zq]' in the "C" locale. - - * A rule can have at most one instance of trailing context (the `/' - operator or the `$' operator). The start condition, `^', and - `<<EOF>>' patterns can only occur at the beginning of a pattern, - and, as well as with `/' and `$', cannot be grouped inside - parentheses. A `^' which does not occur at the beginning of a - rule or a `$' which does not occur at the end of a rule loses its - special properties and is treated as a normal character. - - * The following are invalid: - - - foo/bar$ - <sc1>foo<sc2>bar - - Note that the first of these can be written `foo/bar\n'. - - * The following will result in `$' or `^' being treated as a normal - character: - - - foo|(bar$) - foo|^bar - - If the desired meaning is a `foo' or a - `bar'-followed-by-a-newline, the following could be used (the - special `|' action is explained below, *note Actions::): - - - foo | - bar$ /* action goes here */ - - A similar trick will work for matching a `foo' or a - `bar'-at-the-beginning-of-a-line. - - -File: flex.info, Node: Matching, Next: Actions, Prev: Patterns, Up: Top - -7 How the Input Is Matched -************************** - -When the generated scanner is run, it analyzes its input looking for -strings which match any of its patterns. If it finds more than one -match, it takes the one matching the most text (for trailing context -rules, this includes the length of the trailing part, even though it -will then be returned to the input). If it finds two or more matches of -the same length, the rule listed first in the `flex' input file is -chosen. - - Once the match is determined, the text corresponding to the match -(called the "token") is made available in the global character pointer -`yytext', and its length in the global integer `yyleng'. The "action" -corresponding to the matched pattern is then executed (*note -Actions::), and then the remaining input is scanned for another match. - - If no match is found, then the "default rule" is executed: the next -character in the input is considered matched and copied to the standard -output. Thus, the simplest valid `flex' input is: - - - %% - - which generates a scanner that simply copies its input (one -character at a time) to its output. - - Note that `yytext' can be defined in two different ways: either as a -character _pointer_ or as a character _array_. You can control which -definition `flex' uses by including one of the special directives -`%pointer' or `%array' in the first (definitions) section of your flex -input. The default is `%pointer', unless you use the `-l' lex -compatibility option, in which case `yytext' will be an array. The -advantage of using `%pointer' is substantially faster scanning and no -buffer overflow when matching very large tokens (unless you run out of -dynamic memory). The disadvantage is that you are restricted in how -your actions can modify `yytext' (*note Actions::), and calls to the -`unput()' function destroys the present contents of `yytext', which can -be a considerable porting headache when moving between different `lex' -versions. - - The advantage of `%array' is that you can then modify `yytext' to -your heart's content, and calls to `unput()' do not destroy `yytext' -(*note Actions::). Furthermore, existing `lex' programs sometimes -access `yytext' externally using declarations of the form: - - - extern char yytext[]; - - This definition is erroneous when used with `%pointer', but correct -for `%array'. - - The `%array' declaration defines `yytext' to be an array of `YYLMAX' -characters, which defaults to a fairly large value. You can change the -size by simply #define'ing `YYLMAX' to a different value in the first -section of your `flex' input. As mentioned above, with `%pointer' -yytext grows dynamically to accommodate large tokens. While this means -your `%pointer' scanner can accommodate very large tokens (such as -matching entire blocks of comments), bear in mind that each time the -scanner must resize `yytext' it also must rescan the entire token from -the beginning, so matching such tokens can prove slow. `yytext' -presently does _not_ dynamically grow if a call to `unput()' results in -too much text being pushed back; instead, a run-time error results. - - Also note that you cannot use `%array' with C++ scanner classes -(*note Cxx::). - - -File: flex.info, Node: Actions, Next: Generated Scanner, Prev: Matching, Up: Top - -8 Actions -********* - -Each pattern in a rule has a corresponding "action", which can be any -arbitrary C statement. The pattern ends at the first non-escaped -whitespace character; the remainder of the line is its action. If the -action is empty, then when the pattern is matched the input token is -simply discarded. For example, here is the specification for a program -which deletes all occurrences of `zap me' from its input: - - - %% - "zap me" - - This example will copy all other characters in the input to the -output since they will be matched by the default rule. - - Here is a program which compresses multiple blanks and tabs down to a -single blank, and throws away whitespace found at the end of a line: - - - %% - [ \t]+ putchar( ' ' ); - [ \t]+$ /* ignore this token */ - - If the action contains a `{', then the action spans till the -balancing `}' is found, and the action may cross multiple lines. -`flex' knows about C strings and comments and won't be fooled by braces -found within them, but also allows actions to begin with `%{' and will -consider the action to be all the text up to the next `%}' (regardless -of ordinary braces inside the action). - - An action consisting solely of a vertical bar (`|') means "same as -the action for the next rule". See below for an illustration. - - Actions can include arbitrary C code, including `return' statements -to return a value to whatever routine called `yylex()'. Each time -`yylex()' is called it continues processing tokens from where it last -left off until it either reaches the end of the file or executes a -return. - - Actions are free to modify `yytext' except for lengthening it -(adding characters to its end-these will overwrite later characters in -the input stream). This however does not apply when using `%array' -(*note Matching::). In that case, `yytext' may be freely modified in -any way. - - Actions are free to modify `yyleng' except they should not do so if -the action also includes use of `yymore()' (see below). - - There are a number of special directives which can be included -within an action: - -`ECHO' - copies yytext to the scanner's output. - -`BEGIN' - followed by the name of a start condition places the scanner in the - corresponding start condition (see below). - -`REJECT' - directs the scanner to proceed on to the "second best" rule which - matched the input (or a prefix of the input). The rule is chosen - as described above in *Note Matching::, and `yytext' and `yyleng' - set up appropriately. It may either be one which matched as much - text as the originally chosen rule but came later in the `flex' - input file, or one which matched less text. For example, the - following will both count the words in the input and call the - routine `special()' whenever `frob' is seen: - - - int word_count = 0; - %% - - frob special(); REJECT; - [^ \t\n]+ ++word_count; - - Without the `REJECT', any occurrences of `frob' in the input would - not be counted as words, since the scanner normally executes only - one action per token. Multiple uses of `REJECT' are allowed, each - one finding the next best choice to the currently active rule. For - example, when the following scanner scans the token `abcd', it will - write `abcdabcaba' to the output: - - - %% - a | - ab | - abc | - abcd ECHO; REJECT; - .|\n /* eat up any unmatched character */ - - The first three rules share the fourth's action since they use the - special `|' action. - - `REJECT' is a particularly expensive feature in terms of scanner - performance; if it is used in _any_ of the scanner's actions it - will slow down _all_ of the scanner's matching. Furthermore, - `REJECT' cannot be used with the `-Cf' or `-CF' options (*note - Scanner Options::). - - Note also that unlike the other special actions, `REJECT' is a - _branch_. Code immediately following it in the action will _not_ - be executed. - -`yymore()' - tells the scanner that the next time it matches a rule, the - corresponding token should be _appended_ onto the current value of - `yytext' rather than replacing it. For example, given the input - `mega-kludge' the following will write `mega-mega-kludge' to the - output: - - - %% - mega- ECHO; yymore(); - kludge ECHO; - - First `mega-' is matched and echoed to the output. Then `kludge' - is matched, but the previous `mega-' is still hanging around at the - beginning of `yytext' so the `ECHO' for the `kludge' rule will - actually write `mega-kludge'. - - Two notes regarding use of `yymore()'. First, `yymore()' depends on -the value of `yyleng' correctly reflecting the size of the current -token, so you must not modify `yyleng' if you are using `yymore()'. -Second, the presence of `yymore()' in the scanner's action entails a -minor performance penalty in the scanner's matching speed. - - `yyless(n)' returns all but the first `n' characters of the current -token back to the input stream, where they will be rescanned when the -scanner looks for the next match. `yytext' and `yyleng' are adjusted -appropriately (e.g., `yyleng' will now be equal to `n'). For example, -on the input `foobar' the following will write out `foobarbar': - - - %% - foobar ECHO; yyless(3); - [a-z]+ ECHO; - - An argument of 0 to `yyless()' will cause the entire current input -string to be scanned again. Unless you've changed how the scanner will -subsequently process its input (using `BEGIN', for example), this will -result in an endless loop. - - Note that `yyless()' is a macro and can only be used in the flex -input file, not from other source files. - - `unput(c)' puts the character `c' back onto the input stream. It -will be the next character scanned. The following action will take the -current token and cause it to be rescanned enclosed in parentheses. - - - { - int i; - /* Copy yytext because unput() trashes yytext */ - char *yycopy = strdup( yytext ); - unput( ')' ); - for ( i = yyleng - 1; i >= 0; --i ) - unput( yycopy[i] ); - unput( '(' ); - free( yycopy ); - } - - Note that since each `unput()' puts the given character back at the -_beginning_ of the input stream, pushing back strings must be done -back-to-front. - - An important potential problem when using `unput()' is that if you -are using `%pointer' (the default), a call to `unput()' _destroys_ the -contents of `yytext', starting with its rightmost character and -devouring one character to the left with each call. If you need the -value of `yytext' preserved after a call to `unput()' (as in the above -example), you must either first copy it elsewhere, or build your -scanner using `%array' instead (*note Matching::). - - Finally, note that you cannot put back `EOF' to attempt to mark the -input stream with an end-of-file. - - `input()' reads the next character from the input stream. For -example, the following is one way to eat up C comments: - - - %% - "/*" { - register int c; - - for ( ; ; ) - { - while ( (c = input()) != '*' && - c != EOF ) - ; /* eat up text of comment */ - - if ( c == '*' ) - { - while ( (c = input()) == '*' ) - ; - if ( c == '/' ) - break; /* found the end */ - } - - if ( c == EOF ) - { - error( "EOF in comment" ); - break; - } - } - } - - (Note that if the scanner is compiled using `C++', then `input()' is -instead referred to as yyinput(), in order to avoid a name clash with -the `C++' stream by the name of `input'.) - - `YY_FLUSH_BUFFER()' flushes the scanner's internal buffer so that -the next time the scanner attempts to match a token, it will first -refill the buffer using `YY_INPUT()' (*note Generated Scanner::). This -action is a special case of the more general `yy_flush_buffer()' -function, described below (*note Multiple Input Buffers::) - - `yyterminate()' can be used in lieu of a return statement in an -action. It terminates the scanner and returns a 0 to the scanner's -caller, indicating "all done". By default, `yyterminate()' is also -called when an end-of-file is encountered. It is a macro and may be -redefined. - - -File: flex.info, Node: Generated Scanner, Next: Start Conditions, Prev: Actions, Up: Top - -9 The Generated Scanner -*********************** - -The output of `flex' is the file `lex.yy.c', which contains the -scanning routine `yylex()', a number of tables used by it for matching -tokens, and a number of auxiliary routines and macros. By default, -`yylex()' is declared as follows: - - - int yylex() - { - ... various definitions and the actions in here ... - } - - (If your environment supports function prototypes, then it will be -`int yylex( void )'.) This definition may be changed by defining the -`YY_DECL' macro. For example, you could use: - - - #define YY_DECL float lexscan( a, b ) float a, b; - - to give the scanning routine the name `lexscan', returning a float, -and taking two floats as arguments. Note that if you give arguments to -the scanning routine using a K&R-style/non-prototyped function -declaration, you must terminate the definition with a semi-colon (;). - - `flex' generates `C99' function definitions by default. However flex -does have the ability to generate obsolete, er, `traditional', function -definitions. This is to support bootstrapping gcc on old systems. -Unfortunately, traditional definitions prevent us from using any -standard data types smaller than int (such as short, char, or bool) as -function arguments. For this reason, future versions of `flex' may -generate standard C99 code only, leaving K&R-style functions to the -historians. Currently, if you do *not* want `C99' definitions, then -you must use `%option noansi-definitions'. - - Whenever `yylex()' is called, it scans tokens from the global input -file `yyin' (which defaults to stdin). It continues until it either -reaches an end-of-file (at which point it returns the value 0) or one -of its actions executes a `return' statement. - - If the scanner reaches an end-of-file, subsequent calls are undefined -unless either `yyin' is pointed at a new input file (in which case -scanning continues from that file), or `yyrestart()' is called. -`yyrestart()' takes one argument, a `FILE *' pointer (which can be -NULL, if you've set up `YY_INPUT' to scan from a source other than -`yyin'), and initializes `yyin' for scanning from that file. -Essentially there is no difference between just assigning `yyin' to a -new input file or using `yyrestart()' to do so; the latter is available -for compatibility with previous versions of `flex', and because it can -be used to switch input files in the middle of scanning. It can also -be used to throw away the current input buffer, by calling it with an -argument of `yyin'; but it would be better to use `YY_FLUSH_BUFFER' -(*note Actions::). Note that `yyrestart()' does _not_ reset the start -condition to `INITIAL' (*note Start Conditions::). - - If `yylex()' stops scanning due to executing a `return' statement in -one of the actions, the scanner may then be called again and it will -resume scanning where it left off. - - By default (and for purposes of efficiency), the scanner uses -block-reads rather than simple `getc()' calls to read characters from -`yyin'. The nature of how it gets its input can be controlled by -defining the `YY_INPUT' macro. The calling sequence for `YY_INPUT()' -is `YY_INPUT(buf,result,max_size)'. Its action is to place up to -`max_size' characters in the character array `buf' and return in the -integer variable `result' either the number of characters read or the -constant `YY_NULL' (0 on Unix systems) to indicate `EOF'. The default -`YY_INPUT' reads from the global file-pointer `yyin'. - - Here is a sample definition of `YY_INPUT' (in the definitions -section of the input file): - - - %{ - #define YY_INPUT(buf,result,max_size) \ - { \ - int c = getchar(); \ - result = (c == EOF) ? YY_NULL : (buf[0] = c, 1); \ - } - %} - - This definition will change the input processing to occur one -character at a time. - - When the scanner receives an end-of-file indication from YY_INPUT, it -then checks the `yywrap()' function. If `yywrap()' returns false -(zero), then it is assumed that the function has gone ahead and set up -`yyin' to point to another input file, and scanning continues. If it -returns true (non-zero), then the scanner terminates, returning 0 to -its caller. Note that in either case, the start condition remains -unchanged; it does _not_ revert to `INITIAL'. - - If you do not supply your own version of `yywrap()', then you must -either use `%option noyywrap' (in which case the scanner behaves as -though `yywrap()' returned 1), or you must link with `-lfl' to obtain -the default version of the routine, which always returns 1. - - For scanning from in-memory buffers (e.g., scanning strings), see -*Note Scanning Strings::. *Note Multiple Input Buffers::. - - The scanner writes its `ECHO' output to the `yyout' global (default, -`stdout'), which may be redefined by the user simply by assigning it to -some other `FILE' pointer. - - -File: flex.info, Node: Start Conditions, Next: Multiple Input Buffers, Prev: Generated Scanner, Up: Top - -10 Start Conditions -******************* - -`flex' provides a mechanism for conditionally activating rules. Any -rule whose pattern is prefixed with `<sc>' will only be active when the -scanner is in the "start condition" named `sc'. For example, - - - <STRING>[^"]* { /* eat up the string body ... */ - ... - } - - will be active only when the scanner is in the `STRING' start -condition, and - - - <INITIAL,STRING,QUOTE>\. { /* handle an escape ... */ - ... - } - - will be active only when the current start condition is either -`INITIAL', `STRING', or `QUOTE'. - - Start conditions are declared in the definitions (first) section of -the input using unindented lines beginning with either `%s' or `%x' -followed by a list of names. The former declares "inclusive" start -conditions, the latter "exclusive" start conditions. A start condition -is activated using the `BEGIN' action. Until the next `BEGIN' action -is executed, rules with the given start condition will be active and -rules with other start conditions will be inactive. If the start -condition is inclusive, then rules with no start conditions at all will -also be active. If it is exclusive, then _only_ rules qualified with -the start condition will be active. A set of rules contingent on the -same exclusive start condition describe a scanner which is independent -of any of the other rules in the `flex' input. Because of this, -exclusive start conditions make it easy to specify "mini-scanners" -which scan portions of the input that are syntactically different from -the rest (e.g., comments). - - If the distinction between inclusive and exclusive start conditions -is still a little vague, here's a simple example illustrating the -connection between the two. The set of rules: - - - %s example - %% - - <example>foo do_something(); - - bar something_else(); - - is equivalent to - - - %x example - %% - - <example>foo do_something(); - - <INITIAL,example>bar something_else(); - - Without the `<INITIAL,example>' qualifier, the `bar' pattern in the -second example wouldn't be active (i.e., couldn't match) when in start -condition `example'. If we just used `<example>' to qualify `bar', -though, then it would only be active in `example' and not in `INITIAL', -while in the first example it's active in both, because in the first -example the `example' start condition is an inclusive `(%s)' start -condition. - - Also note that the special start-condition specifier `<*>' matches -every start condition. Thus, the above example could also have been -written: - - - %x example - %% - - <example>foo do_something(); - - <*>bar something_else(); - - The default rule (to `ECHO' any unmatched character) remains active -in start conditions. It is equivalent to: - - - <*>.|\n ECHO; - - `BEGIN(0)' returns to the original state where only the rules with -no start conditions are active. This state can also be referred to as -the start-condition `INITIAL', so `BEGIN(INITIAL)' is equivalent to -`BEGIN(0)'. (The parentheses around the start condition name are not -required but are considered good style.) - - `BEGIN' actions can also be given as indented code at the beginning -of the rules section. For example, the following will cause the scanner -to enter the `SPECIAL' start condition whenever `yylex()' is called and -the global variable `enter_special' is true: - - - int enter_special; - - %x SPECIAL - %% - if ( enter_special ) - BEGIN(SPECIAL); - - <SPECIAL>blahblahblah - ...more rules follow... - - To illustrate the uses of start conditions, here is a scanner which -provides two different interpretations of a string like `123.456'. By -default it will treat it as three tokens, the integer `123', a dot -(`.'), and the integer `456'. But if the string is preceded earlier in -the line by the string `expect-floats' it will treat it as a single -token, the floating-point number `123.456': - - - %{ - #include <math.h> - %} - %s expect - - %% - expect-floats BEGIN(expect); - - <expect>[0-9]+@samp{.}[0-9]+ { - printf( "found a float, = %f\n", - atof( yytext ) ); - } - <expect>\n { - /* that's the end of the line, so - * we need another "expect-number" - * before we'll recognize any more - * numbers - */ - BEGIN(INITIAL); - } - - [0-9]+ { - printf( "found an integer, = %d\n", - atoi( yytext ) ); - } - - "." printf( "found a dot\n" ); - - Here is a scanner which recognizes (and discards) C comments while -maintaining a count of the current input line. - - - %x comment - %% - int line_num = 1; - - "/*" BEGIN(comment); - - <comment>[^*\n]* /* eat anything that's not a '*' */ - <comment>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */ - <comment>\n ++line_num; - <comment>"*"+"/" BEGIN(INITIAL); - - This scanner goes to a bit of trouble to match as much text as -possible with each rule. In general, when attempting to write a -high-speed scanner try to match as much possible in each rule, as it's -a big win. - - Note that start-conditions names are really integer values and can -be stored as such. Thus, the above could be extended in the following -fashion: - - - %x comment foo - %% - int line_num = 1; - int comment_caller; - - "/*" { - comment_caller = INITIAL; - BEGIN(comment); - } - - ... - - <foo>"/*" { - comment_caller = foo; - BEGIN(comment); - } - - <comment>[^*\n]* /* eat anything that's not a '*' */ - <comment>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */ - <comment>\n ++line_num; - <comment>"*"+"/" BEGIN(comment_caller); - - Furthermore, you can access the current start condition using the -integer-valued `YY_START' macro. For example, the above assignments to -`comment_caller' could instead be written - - - comment_caller = YY_START; - - Flex provides `YYSTATE' as an alias for `YY_START' (since that is -what's used by AT&T `lex'). - - For historical reasons, start conditions do not have their own -name-space within the generated scanner. The start condition names are -unmodified in the generated scanner and generated header. *Note -option-header::. *Note option-prefix::. - - Finally, here's an example of how to match C-style quoted strings -using exclusive start conditions, including expanded escape sequences -(but not including checking for a string that's too long): - - - %x str - - %% - char string_buf[MAX_STR_CONST]; - char *string_buf_ptr; - - - \" string_buf_ptr = string_buf; BEGIN(str); - - <str>\" { /* saw closing quote - all done */ - BEGIN(INITIAL); - *string_buf_ptr = '\0'; - /* return string constant token type and - * value to parser - */ - } - - <str>\n { - /* error - unterminated string constant */ - /* generate error message */ - } - - <str>\\[0-7]{1,3} { - /* octal escape sequence */ - int result; - - (void) sscanf( yytext + 1, "%o", &result ); - - if ( result > 0xff ) - /* error, constant is out-of-bounds */ - - *string_buf_ptr++ = result; - } - - <str>\\[0-9]+ { - /* generate error - bad escape sequence; something - * like '\48' or '\0777777' - */ - } - - <str>\\n *string_buf_ptr++ = '\n'; - <str>\\t *string_buf_ptr++ = '\t'; - <str>\\r *string_buf_ptr++ = '\r'; - <str>\\b *string_buf_ptr++ = '\b'; - <str>\\f *string_buf_ptr++ = '\f'; - - <str>\\(.|\n) *string_buf_ptr++ = yytext[1]; - - <str>[^\\\n\"]+ { - char *yptr = yytext; - - while ( *yptr ) - *string_buf_ptr++ = *yptr++; - } - - Often, such as in some of the examples above, you wind up writing a -whole bunch of rules all preceded by the same start condition(s). Flex -makes this a little easier and cleaner by introducing a notion of start -condition "scope". A start condition scope is begun with: - - - <SCs>{ - - where `SCs' is a list of one or more start conditions. Inside the -start condition scope, every rule automatically has the prefix `SCs>' -applied to it, until a `}' which matches the initial `{'. So, for -example, - - - <ESC>{ - "\\n" return '\n'; - "\\r" return '\r'; - "\\f" return '\f'; - "\\0" return '\0'; - } - - is equivalent to: - - - <ESC>"\\n" return '\n'; - <ESC>"\\r" return '\r'; - <ESC>"\\f" return '\f'; - <ESC>"\\0" return '\0'; - - Start condition scopes may be nested. - - The following routines are available for manipulating stacks of -start conditions: - - -- Function: void yy_push_state ( int `new_state' ) - pushes the current start condition onto the top of the start - condition stack and switches to `new_state' as though you had used - `BEGIN new_state' (recall that start condition names are also - integers). - - -- Function: void yy_pop_state () - pops the top of the stack and switches to it via `BEGIN'. - - -- Function: int yy_top_state () - returns the top of the stack without altering the stack's contents. - - The start condition stack grows dynamically and so has no built-in -size limitation. If memory is exhausted, program execution aborts. - - To use start condition stacks, your scanner must include a `%option -stack' directive (*note Scanner Options::). - - -File: flex.info, Node: Multiple Input Buffers, Next: EOF, Prev: Start Conditions, Up: Top - -11 Multiple Input Buffers -************************* - -Some scanners (such as those which support "include" files) require -reading from several input streams. As `flex' scanners do a large -amount of buffering, one cannot control where the next input will be -read from by simply writing a `YY_INPUT()' which is sensitive to the -scanning context. `YY_INPUT()' is only called when the scanner reaches -the end of its buffer, which may be a long time after scanning a -statement such as an `include' statement which requires switching the -input source. - - To negotiate these sorts of problems, `flex' provides a mechanism -for creating and switching between multiple input buffers. An input -buffer is created by using: - - -- Function: YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size ) - - which takes a `FILE' pointer and a size and creates a buffer -associated with the given file and large enough to hold `size' -characters (when in doubt, use `YY_BUF_SIZE' for the size). It returns -a `YY_BUFFER_STATE' handle, which may then be passed to other routines -(see below). The `YY_BUFFER_STATE' type is a pointer to an opaque -`struct yy_buffer_state' structure, so you may safely initialize -`YY_BUFFER_STATE' variables to `((YY_BUFFER_STATE) 0)' if you wish, and -also refer to the opaque structure in order to correctly declare input -buffers in source files other than that of your scanner. Note that the -`FILE' pointer in the call to `yy_create_buffer' is only used as the -value of `yyin' seen by `YY_INPUT'. If you redefine `YY_INPUT()' so it -no longer uses `yyin', then you can safely pass a NULL `FILE' pointer to -`yy_create_buffer'. You select a particular buffer to scan from using: - - -- Function: void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer ) - - The above function switches the scanner's input buffer so subsequent -tokens will come from `new_buffer'. Note that `yy_switch_to_buffer()' -may be used by `yywrap()' to set things up for continued scanning, -instead of opening a new file and pointing `yyin' at it. If you are -looking for a stack of input buffers, then you want to use -`yypush_buffer_state()' instead of this function. Note also that -switching input sources via either `yy_switch_to_buffer()' or -`yywrap()' does _not_ change the start condition. - - -- Function: void yy_delete_buffer ( YY_BUFFER_STATE buffer ) - - is used to reclaim the storage associated with a buffer. (`buffer' -can be NULL, in which case the routine does nothing.) You can also -clear the current contents of a buffer using: - - -- Function: void yypush_buffer_state ( YY_BUFFER_STATE buffer ) - - This function pushes the new buffer state onto an internal stack. -The pushed state becomes the new current state. The stack is maintained -by flex and will grow as required. This function is intended to be used -instead of `yy_switch_to_buffer', when you want to change states, but -preserve the current state for later use. - - -- Function: void yypop_buffer_state ( ) - - This function removes the current state from the top of the stack, -and deletes it by calling `yy_delete_buffer'. The next state on the -stack, if any, becomes the new current state. - - -- Function: void yy_flush_buffer ( YY_BUFFER_STATE buffer ) - - This function discards the buffer's contents, so the next time the -scanner attempts to match a token from the buffer, it will first fill -the buffer anew using `YY_INPUT()'. - - -- Function: YY_BUFFER_STATE yy_new_buffer ( FILE *file, int size ) - - is an alias for `yy_create_buffer()', provided for compatibility -with the C++ use of `new' and `delete' for creating and destroying -dynamic objects. - - `YY_CURRENT_BUFFER' macro returns a `YY_BUFFER_STATE' handle to the -current buffer. It should not be used as an lvalue. - - Here are two examples of using these features for writing a scanner -which expands include files (the `<<EOF>>' feature is discussed below). - - This first example uses yypush_buffer_state and yypop_buffer_state. -Flex maintains the stack internally. - - - /* the "incl" state is used for picking up the name - * of an include file - */ - %x incl - %% - include BEGIN(incl); - - [a-z]+ ECHO; - [^a-z\n]*\n? ECHO; - - <incl>[ \t]* /* eat the whitespace */ - <incl>[^ \t\n]+ { /* got the include file name */ - yyin = fopen( yytext, "r" ); - - if ( ! yyin ) - error( ... ); - - yypush_buffer_state(yy_create_buffer( yyin, YY_BUF_SIZE )); - - BEGIN(INITIAL); - } - - <<EOF>> { - yypop_buffer_state(); - - if ( !YY_CURRENT_BUFFER ) - { - yyterminate(); - } - } - - The second example, below, does the same thing as the previous -example did, but manages its own input buffer stack manually (instead -of letting flex do it). - - - /* the "incl" state is used for picking up the name - * of an include file - */ - %x incl - - %{ - #define MAX_INCLUDE_DEPTH 10 - YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH]; - int include_stack_ptr = 0; - %} - - %% - include BEGIN(incl); - - [a-z]+ ECHO; - [^a-z\n]*\n? ECHO; - - <incl>[ \t]* /* eat the whitespace */ - <incl>[^ \t\n]+ { /* got the include file name */ - if ( include_stack_ptr >= MAX_INCLUDE_DEPTH ) - { - fprintf( stderr, "Includes nested too deeply" ); - exit( 1 ); - } - - include_stack[include_stack_ptr++] = - YY_CURRENT_BUFFER; - - yyin = fopen( yytext, "r" ); - - if ( ! yyin ) - error( ... ); - - yy_switch_to_buffer( - yy_create_buffer( yyin, YY_BUF_SIZE ) ); - - BEGIN(INITIAL); - } - - <<EOF>> { - if ( --include_stack_ptr 0 ) - { - yyterminate(); - } - - else - { - yy_delete_buffer( YY_CURRENT_BUFFER ); - yy_switch_to_buffer( - include_stack[include_stack_ptr] ); - } - } - - The following routines are available for setting up input buffers for -scanning in-memory strings instead of files. All of them create a new -input buffer for scanning the string, and return a corresponding -`YY_BUFFER_STATE' handle (which you should delete with -`yy_delete_buffer()' when done with it). They also switch to the new -buffer using `yy_switch_to_buffer()', so the next call to `yylex()' -will start scanning the string. - - -- Function: YY_BUFFER_STATE yy_scan_string ( const char *str ) - scans a NUL-terminated string. - - -- Function: YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int - len ) - scans `len' bytes (including possibly `NUL's) starting at location - `bytes'. - - Note that both of these functions create and scan a _copy_ of the -string or bytes. (This may be desirable, since `yylex()' modifies the -contents of the buffer it is scanning.) You can avoid the copy by -using: - - -- Function: YY_BUFFER_STATE yy_scan_buffer (char *base, yy_size_t - size) - which scans in place the buffer starting at `base', consisting of - `size' bytes, the last two bytes of which _must_ be - `YY_END_OF_BUFFER_CHAR' (ASCII NUL). These last two bytes are not - scanned; thus, scanning consists of `base[0]' through - `base[size-2]', inclusive. - - If you fail to set up `base' in this manner (i.e., forget the final -two `YY_END_OF_BUFFER_CHAR' bytes), then `yy_scan_buffer()' returns a -NULL pointer instead of creating a new input buffer. - - -- Data type: yy_size_t - is an integral type to which you can cast an integer expression - reflecting the size of the buffer. - - -File: flex.info, Node: EOF, Next: Misc Macros, Prev: Multiple Input Buffers, Up: Top - -12 End-of-File Rules -******************** - -The special rule `<<EOF>>' indicates actions which are to be taken when -an end-of-file is encountered and `yywrap()' returns non-zero (i.e., -indicates no further files to process). The action must finish by -doing one of the following things: - - * assigning `yyin' to a new input file (in previous versions of - `flex', after doing the assignment you had to call the special - action `YY_NEW_FILE'. This is no longer necessary.) - - * executing a `return' statement; - - * executing the special `yyterminate()' action. - - * or, switching to a new buffer using `yy_switch_to_buffer()' as - shown in the example above. - - <<EOF>> rules may not be used with other patterns; they may only be -qualified with a list of start conditions. If an unqualified <<EOF>> -rule is given, it applies to _all_ start conditions which do not -already have <<EOF>> actions. To specify an <<EOF>> rule for only the -initial start condition, use: - - - <INITIAL><<EOF>> - - These rules are useful for catching things like unclosed comments. -An example: - - - %x quote - %% - - ...other rules for dealing with quotes... - - <quote><<EOF>> { - error( "unterminated quote" ); - yyterminate(); - } - <<EOF>> { - if ( *++filelist ) - yyin = fopen( *filelist, "r" ); - else - yyterminate(); - } - - -File: flex.info, Node: Misc Macros, Next: User Values, Prev: EOF, Up: Top - -13 Miscellaneous Macros -*********************** - -The macro `YY_USER_ACTION' can be defined to provide an action which is -always executed prior to the matched rule's action. For example, it -could be #define'd to call a routine to convert yytext to lower-case. -When `YY_USER_ACTION' is invoked, the variable `yy_act' gives the -number of the matched rule (rules are numbered starting with 1). -Suppose you want to profile how often each of your rules is matched. -The following would do the trick: - - - #define YY_USER_ACTION ++ctr[yy_act] - - where `ctr' is an array to hold the counts for the different rules. -Note that the macro `YY_NUM_RULES' gives the total number of rules -(including the default rule), even if you use `-s)', so a correct -declaration for `ctr' is: - - - int ctr[YY_NUM_RULES]; - - The macro `YY_USER_INIT' may be defined to provide an action which -is always executed before the first scan (and before the scanner's -internal initializations are done). For example, it could be used to -call a routine to read in a data table or open a logging file. - - The macro `yy_set_interactive(is_interactive)' can be used to -control whether the current buffer is considered "interactive". An -interactive buffer is processed more slowly, but must be used when the -scanner's input source is indeed interactive to avoid problems due to -waiting to fill buffers (see the discussion of the `-I' flag in *Note -Scanner Options::). A non-zero value in the macro invocation marks the -buffer as interactive, a zero value as non-interactive. Note that use -of this macro overrides `%option always-interactive' or `%option -never-interactive' (*note Scanner Options::). `yy_set_interactive()' -must be invoked prior to beginning to scan the buffer that is (or is -not) to be considered interactive. - - The macro `yy_set_bol(at_bol)' can be used to control whether the -current buffer's scanning context for the next token match is done as -though at the beginning of a line. A non-zero macro argument makes -rules anchored with `^' active, while a zero argument makes `^' rules -inactive. - - The macro `YY_AT_BOL()' returns true if the next token scanned from -the current buffer will have `^' rules active, false otherwise. - - In the generated scanner, the actions are all gathered in one large -switch statement and separated using `YY_BREAK', which may be -redefined. By default, it is simply a `break', to separate each rule's -action from the following rule's. Redefining `YY_BREAK' allows, for -example, C++ users to #define YY_BREAK to do nothing (while being very -careful that every rule ends with a `break' or a `return'!) to avoid -suffering from unreachable statement warnings where because a rule's -action ends with `return', the `YY_BREAK' is inaccessible. - - -File: flex.info, Node: User Values, Next: Yacc, Prev: Misc Macros, Up: Top - -14 Values Available To the User -******************************* - -This chapter summarizes the various values available to the user in the -rule actions. - -`char *yytext' - holds the text of the current token. It may be modified but not - lengthened (you cannot append characters to the end). - - If the special directive `%array' appears in the first section of - the scanner description, then `yytext' is instead declared `char - yytext[YYLMAX]', where `YYLMAX' is a macro definition that you can - redefine in the first section if you don't like the default value - (generally 8KB). Using `%array' results in somewhat slower - scanners, but the value of `yytext' becomes immune to calls to - `unput()', which potentially destroy its value when `yytext' is a - character pointer. The opposite of `%array' is `%pointer', which - is the default. - - You cannot use `%array' when generating C++ scanner classes (the - `-+' flag). - -`int yyleng' - holds the length of the current token. - -`FILE *yyin' - is the file which by default `flex' reads from. It may be - redefined but doing so only makes sense before scanning begins or - after an EOF has been encountered. Changing it in the midst of - scanning will have unexpected results since `flex' buffers its - input; use `yyrestart()' instead. Once scanning terminates - because an end-of-file has been seen, you can assign `yyin' at the - new input file and then call the scanner again to continue - scanning. - -`void yyrestart( FILE *new_file )' - may be called to point `yyin' at the new input file. The - switch-over to the new file is immediate (any previously - buffered-up input is lost). Note that calling `yyrestart()' with - `yyin' as an argument thus throws away the current input buffer - and continues scanning the same input file. - -`FILE *yyout' - is the file to which `ECHO' actions are done. It can be reassigned - by the user. - -`YY_CURRENT_BUFFER' - returns a `YY_BUFFER_STATE' handle to the current buffer. - -`YY_START' - returns an integer value corresponding to the current start - condition. You can subsequently use this value with `BEGIN' to - return to that start condition. - - -File: flex.info, Node: Yacc, Next: Scanner Options, Prev: User Values, Up: Top - -15 Interfacing with Yacc -************************ - -One of the main uses of `flex' is as a companion to the `yacc' -parser-generator. `yacc' parsers expect to call a routine named -`yylex()' to find the next input token. The routine is supposed to -return the type of the next token as well as putting any associated -value in the global `yylval'. To use `flex' with `yacc', one specifies -the `-d' option to `yacc' to instruct it to generate the file `y.tab.h' -containing definitions of all the `%tokens' appearing in the `yacc' -input. This file is then included in the `flex' scanner. For example, -if one of the tokens is `TOK_NUMBER', part of the scanner might look -like: - - - %{ - #include "y.tab.h" - %} - - %% - - [0-9]+ yylval = atoi( yytext ); return TOK_NUMBER; - - -File: flex.info, Node: Scanner Options, Next: Performance, Prev: Yacc, Up: Top - -16 Scanner Options -****************** - -The various `flex' options are categorized by function in the following -menu. If you want to lookup a particular option by name, *Note Index of -Scanner Options::. - -* Menu: - -* Options for Specifying Filenames:: -* Options Affecting Scanner Behavior:: -* Code-Level And API Options:: -* Options for Scanner Speed and Size:: -* Debugging Options:: -* Miscellaneous Options:: - - Even though there are many scanner options, a typical scanner might -only specify the following options: - - - %option 8bit reentrant bison-bridge - %option warn nodefault - %option yylineno - %option outfile="scanner.c" header-file="scanner.h" - - The first line specifies the general type of scanner we want. The -second line specifies that we are being careful. The third line asks -flex to track line numbers. The last line tells flex what to name the -files. (The options can be specified in any order. We just divided -them.) - - `flex' also provides a mechanism for controlling options within the -scanner specification itself, rather than from the flex command-line. -This is done by including `%option' directives in the first section of -the scanner specification. You can specify multiple options with a -single `%option' directive, and multiple directives in the first -section of your flex input file. - - Most options are given simply as names, optionally preceded by the -word `no' (with no intervening whitespace) to negate their meaning. -The names are the same as their long-option equivalents (but without the -leading `--' ). - - `flex' scans your rule actions to determine whether you use the -`REJECT' or `yymore()' features. The `REJECT' and `yymore' options are -available to override its decision as to whether you use the options, -either by setting them (e.g., `%option reject)' to indicate the feature -is indeed used, or unsetting them to indicate it actually is not used -(e.g., `%option noyymore)'. - - A number of options are available for lint purists who want to -suppress the appearance of unneeded routines in the generated scanner. -Each of the following, if unset (e.g., `%option nounput'), results in -the corresponding routine not appearing in the generated scanner: - - - input, unput - yy_push_state, yy_pop_state, yy_top_state - yy_scan_buffer, yy_scan_bytes, yy_scan_string - - yyget_extra, yyset_extra, yyget_leng, yyget_text, - yyget_lineno, yyset_lineno, yyget_in, yyset_in, - yyget_out, yyset_out, yyget_lval, yyset_lval, - yyget_lloc, yyset_lloc, yyget_debug, yyset_debug - - (though `yy_push_state()' and friends won't appear anyway unless you -use `%option stack)'. - - -File: flex.info, Node: Options for Specifying Filenames, Next: Options Affecting Scanner Behavior, Prev: Scanner Options, Up: Scanner Options - -16.1 Options for Specifying Filenames -===================================== - -`--header-file=FILE, `%option header-file="FILE"'' - instructs flex to write a C header to `FILE'. This file contains - function prototypes, extern variables, and types used by the - scanner. Only the external API is exported by the header file. - Many macros that are usable from within scanner actions are not - exported to the header file. This is due to namespace problems and - the goal of a clean external API. - - While in the header, the macro `yyIN_HEADER' is defined, where `yy' - is substituted with the appropriate prefix. - - The `--header-file' option is not compatible with the `--c++' - option, since the C++ scanner provides its own header in - `yyFlexLexer.h'. - -`-oFILE, --outfile=FILE, `%option outfile="FILE"'' - directs flex to write the scanner to the file `FILE' instead of - `lex.yy.c'. If you combine `--outfile' with the `--stdout' option, - then the scanner is written to `stdout' but its `#line' directives - (see the `-l' option above) refer to the file `FILE'. - -`-t, --stdout, `%option stdout'' - instructs `flex' to write the scanner it generates to standard - output instead of `lex.yy.c'. - -`-SFILE, --skel=FILE' - overrides the default skeleton file from which `flex' constructs - its scanners. You'll never need this option unless you are doing - `flex' maintenance or development. - -`--tables-file=FILE' - Write serialized scanner dfa tables to FILE. The generated scanner - will not contain the tables, and requires them to be loaded at - runtime. *Note serialization::. - -`--tables-verify' - This option is for flex development. We document it here in case - you stumble upon it by accident or in case you suspect some - inconsistency in the serialized tables. Flex will serialize the - scanner dfa tables but will also generate the in-code tables as it - normally does. At runtime, the scanner will verify that the - serialized tables match the in-code tables, instead of loading - them. - - - -File: flex.info, Node: Options Affecting Scanner Behavior, Next: Code-Level And API Options, Prev: Options for Specifying Filenames, Up: Scanner Options - -16.2 Options Affecting Scanner Behavior -======================================= - -`-i, --case-insensitive, `%option case-insensitive'' - instructs `flex' to generate a "case-insensitive" scanner. The - case of letters given in the `flex' input patterns will be ignored, - and tokens in the input will be matched regardless of case. The - matched text given in `yytext' will have the preserved case (i.e., - it will not be folded). For tricky behavior, see *Note case and - character ranges::. - -`-l, --lex-compat, `%option lex-compat'' - turns on maximum compatibility with the original AT&T `lex' - implementation. Note that this does not mean _full_ compatibility. - Use of this option costs a considerable amount of performance, and - it cannot be used with the `--c++', `--full', `--fast', `-Cf', or - `-CF' options. For details on the compatibilities it provides, see - *Note Lex and Posix::. This option also results in the name - `YY_FLEX_LEX_COMPAT' being `#define''d in the generated scanner. - -`-B, --batch, `%option batch'' - instructs `flex' to generate a "batch" scanner, the opposite of - _interactive_ scanners generated by `--interactive' (see below). - In general, you use `-B' when you are _certain_ that your scanner - will never be used interactively, and you want to squeeze a - _little_ more performance out of it. If your goal is instead to - squeeze out a _lot_ more performance, you should be using the - `-Cf' or `-CF' options, which turn on `--batch' automatically - anyway. - -`-I, --interactive, `%option interactive'' - instructs `flex' to generate an interactive scanner. An - interactive scanner is one that only looks ahead to decide what - token has been matched if it absolutely must. It turns out that - always looking one extra character ahead, even if the scanner has - already seen enough text to disambiguate the current token, is a - bit faster than only looking ahead when necessary. But scanners - that always look ahead give dreadful interactive performance; for - example, when a user types a newline, it is not recognized as a - newline token until they enter _another_ token, which often means - typing in another whole line. - - `flex' scanners default to `interactive' unless you use the `-Cf' - or `-CF' table-compression options (*note Performance::). That's - because if you're looking for high-performance you should be using - one of these options, so if you didn't, `flex' assumes you'd - rather trade off a bit of run-time performance for intuitive - interactive behavior. Note also that you _cannot_ use - `--interactive' in conjunction with `-Cf' or `-CF'. Thus, this - option is not really needed; it is on by default for all those - cases in which it is allowed. - - You can force a scanner to _not_ be interactive by using `--batch' - -`-7, --7bit, `%option 7bit'' - instructs `flex' to generate a 7-bit scanner, i.e., one which can - only recognize 7-bit characters in its input. The advantage of - using `--7bit' is that the scanner's tables can be up to half the - size of those generated using the `--8bit'. The disadvantage is - that such scanners often hang or crash if their input contains an - 8-bit character. - - Note, however, that unless you generate your scanner using the - `-Cf' or `-CF' table compression options, use of `--7bit' will - save only a small amount of table space, and make your scanner - considerably less portable. `Flex''s default behavior is to - generate an 8-bit scanner unless you use the `-Cf' or `-CF', in - which case `flex' defaults to generating 7-bit scanners unless - your site was always configured to generate 8-bit scanners (as will - often be the case with non-USA sites). You can tell whether flex - generated a 7-bit or an 8-bit scanner by inspecting the flag - summary in the `--verbose' output as described above. - - Note that if you use `-Cfe' or `-CFe' `flex' still defaults to - generating an 8-bit scanner, since usually with these compression - options full 8-bit tables are not much more expensive than 7-bit - tables. - -`-8, --8bit, `%option 8bit'' - instructs `flex' to generate an 8-bit scanner, i.e., one which can - recognize 8-bit characters. This flag is only needed for scanners - generated using `-Cf' or `-CF', as otherwise flex defaults to - generating an 8-bit scanner anyway. - - See the discussion of `--7bit' above for `flex''s default behavior - and the tradeoffs between 7-bit and 8-bit scanners. - -`--default, `%option default'' - generate the default rule. - -`--always-interactive, `%option always-interactive'' - instructs flex to generate a scanner which always considers its - input _interactive_. Normally, on each new input file the scanner - calls `isatty()' in an attempt to determine whether the scanner's - input source is interactive and thus should be read a character at - a time. When this option is used, however, then no such call is - made. - -`--never-interactive, `--never-interactive'' - instructs flex to generate a scanner which never considers its - input interactive. This is the opposite of `always-interactive'. - -`-X, --posix, `%option posix'' - turns on maximum compatibility with the POSIX 1003.2-1992 - definition of `lex'. Since `flex' was originally designed to - implement the POSIX definition of `lex' this generally involves - very few changes in behavior. At the current writing the known - differences between `flex' and the POSIX standard are: - - * In POSIX and AT&T `lex', the repeat operator, `{}', has lower - precedence than concatenation (thus `ab{3}' yields `ababab'). - Most POSIX utilities use an Extended Regular Expression (ERE) - precedence that has the precedence of the repeat operator - higher than concatenation (which causes `ab{3}' to yield - `abbb'). By default, `flex' places the precedence of the - repeat operator higher than concatenation which matches the - ERE processing of other POSIX utilities. When either - `--posix' or `-l' are specified, `flex' will use the - traditional AT&T and POSIX-compliant precedence for the - repeat operator where concatenation has higher precedence - than the repeat operator. - -`--stack, `%option stack'' - enables the use of start condition stacks (*note Start - Conditions::). - -`--stdinit, `%option stdinit'' - if set (i.e., %option stdinit) initializes `yyin' and `yyout' to - `stdin' and `stdout', instead of the default of `NULL'. Some - existing `lex' programs depend on this behavior, even though it is - not compliant with ANSI C, which does not require `stdin' and - `stdout' to be compile-time constant. In a reentrant scanner, - however, this is not a problem since initialization is performed - in `yylex_init' at runtime. - -`--yylineno, `%option yylineno'' - directs `flex' to generate a scanner that maintains the number of - the current line read from its input in the global variable - `yylineno'. This option is implied by `%option lex-compat'. In a - reentrant C scanner, the macro `yylineno' is accessible regardless - of the value of `%option yylineno', however, its value is not - modified by `flex' unless `%option yylineno' is enabled. - -`--yywrap, `%option yywrap'' - if unset (i.e., `--noyywrap)', makes the scanner not call - `yywrap()' upon an end-of-file, but simply assume that there are no - more files to scan (until the user points `yyin' at a new file and - calls `yylex()' again). - - - -File: flex.info, Node: Code-Level And API Options, Next: Options for Scanner Speed and Size, Prev: Options Affecting Scanner Behavior, Up: Scanner Options - -16.3 Code-Level And API Options -=============================== - -`--ansi-definitions, `%option ansi-definitions'' - instruct flex to generate ANSI C99 definitions for functions. - This option is enabled by default. If `%option - noansi-definitions' is specified, then the obsolete style is - generated. - -`--ansi-prototypes, `%option ansi-prototypes'' - instructs flex to generate ANSI C99 prototypes for functions. - This option is enabled by default. If `noansi-prototypes' is - specified, then prototypes will have empty parameter lists. - -`--bison-bridge, `%option bison-bridge'' - instructs flex to generate a C scanner that is meant to be called - by a `GNU bison' parser. The scanner has minor API changes for - `bison' compatibility. In particular, the declaration of `yylex' - is modified to take an additional parameter, `yylval'. *Note - Bison Bridge::. - -`--bison-locations, `%option bison-locations'' - instruct flex that `GNU bison' `%locations' are being used. This - means `yylex' will be passed an additional parameter, `yylloc'. - This option implies `%option bison-bridge'. *Note Bison Bridge::. - -`-L, --noline, `%option noline'' - instructs `flex' not to generate `#line' directives. Without this - option, `flex' peppers the generated scanner with `#line' - directives so error messages in the actions will be correctly - located with respect to either the original `flex' input file (if - the errors are due to code in the input file), or `lex.yy.c' (if - the errors are `flex''s fault - you should report these sorts of - errors to the email address given in *Note Reporting Bugs::). - -`-R, --reentrant, `%option reentrant'' - instructs flex to generate a reentrant C scanner. The generated - scanner may safely be used in a multi-threaded environment. The - API for a reentrant scanner is different than for a non-reentrant - scanner *note Reentrant::). Because of the API difference between - reentrant and non-reentrant `flex' scanners, non-reentrant flex - code must be modified before it is suitable for use with this - option. This option is not compatible with the `--c++' option. - - The option `--reentrant' does not affect the performance of the - scanner. - -`-+, --c++, `%option c++'' - specifies that you want flex to generate a C++ scanner class. - *Note Cxx::, for details. - -`--array, `%option array'' - specifies that you want yytext to be an array instead of a char* - -`--pointer, `%option pointer'' - specify that `yytext' should be a `char *', not an array. This - default is `char *'. - -`-PPREFIX, --prefix=PREFIX, `%option prefix="PREFIX"'' - changes the default `yy' prefix used by `flex' for all - globally-visible variable and function names to instead be - `PREFIX'. For example, `--prefix=foo' changes the name of - `yytext' to `footext'. It also changes the name of the default - output file from `lex.yy.c' to `lex.foo.c'. Here is a partial - list of the names affected: - - - yy_create_buffer - yy_delete_buffer - yy_flex_debug - yy_init_buffer - yy_flush_buffer - yy_load_buffer_state - yy_switch_to_buffer - yyin - yyleng - yylex - yylineno - yyout - yyrestart - yytext - yywrap - yyalloc - yyrealloc - yyfree - - (If you are using a C++ scanner, then only `yywrap' and - `yyFlexLexer' are affected.) Within your scanner itself, you can - still refer to the global variables and functions using either - version of their name; but externally, they have the modified name. - - This option lets you easily link together multiple `flex' programs - into the same executable. Note, though, that using this option - also renames `yywrap()', so you now _must_ either provide your own - (appropriately-named) version of the routine for your scanner, or - use `%option noyywrap', as linking with `-lfl' no longer provides - one for you by default. - -`--main, `%option main'' - directs flex to provide a default `main()' program for the - scanner, which simply calls `yylex()'. This option implies - `noyywrap' (see below). - -`--nounistd, `%option nounistd'' - suppresses inclusion of the non-ANSI header file `unistd.h'. This - option is meant to target environments in which `unistd.h' does - not exist. Be aware that certain options may cause flex to - generate code that relies on functions normally found in - `unistd.h', (e.g. `isatty()', `read()'.) If you wish to use these - functions, you will have to inform your compiler where to find - them. *Note option-always-interactive::. *Note option-read::. - -`--yyclass=NAME, `%option yyclass="NAME"'' - only applies when generating a C++ scanner (the `--c++' option). - It informs `flex' that you have derived `NAME' as a subclass of - `yyFlexLexer', so `flex' will place your actions in the member - function `foo::yylex()' instead of `yyFlexLexer::yylex()'. It - also generates a `yyFlexLexer::yylex()' member function that emits - a run-time error (by invoking `yyFlexLexer::LexerError())' if - called. *Note Cxx::. - - - -File: flex.info, Node: Options for Scanner Speed and Size, Next: Debugging Options, Prev: Code-Level And API Options, Up: Scanner Options - -16.4 Options for Scanner Speed and Size -======================================= - -`-C[aefFmr]' - controls the degree of table compression and, more generally, - trade-offs between small scanners and fast scanners. - - `-C' - A lone `-C' specifies that the scanner tables should be - compressed but neither equivalence classes nor - meta-equivalence classes should be used. - - `-Ca, --align, `%option align'' - ("align") instructs flex to trade off larger tables in the - generated scanner for faster performance because the elements - of the tables are better aligned for memory access and - computation. On some RISC architectures, fetching and - manipulating longwords is more efficient than with - smaller-sized units such as shortwords. This option can - quadruple the size of the tables used by your scanner. - - `-Ce, --ecs, `%option ecs'' - directs `flex' to construct "equivalence classes", i.e., sets - of characters which have identical lexical properties (for - example, if the only appearance of digits in the `flex' input - is in the character class "[0-9]" then the digits '0', '1', - ..., '9' will all be put in the same equivalence class). - Equivalence classes usually give dramatic reductions in the - final table/object file sizes (typically a factor of 2-5) and - are pretty cheap performance-wise (one array look-up per - character scanned). - - `-Cf' - specifies that the "full" scanner tables should be generated - - `flex' should not compress the tables by taking advantages of - similar transition functions for different states. - - `-CF' - specifies that the alternate fast scanner representation - (described above under the `--fast' flag) should be used. - This option cannot be used with `--c++'. - - `-Cm, --meta-ecs, `%option meta-ecs'' - directs `flex' to construct "meta-equivalence classes", which - are sets of equivalence classes (or characters, if equivalence - classes are not being used) that are commonly used together. - Meta-equivalence classes are often a big win when using - compressed tables, but they have a moderate performance - impact (one or two `if' tests and one array look-up per - character scanned). - - `-Cr, --read, `%option read'' - causes the generated scanner to _bypass_ use of the standard - I/O library (`stdio') for input. Instead of calling - `fread()' or `getc()', the scanner will use the `read()' - system call, resulting in a performance gain which varies - from system to system, but in general is probably negligible - unless you are also using `-Cf' or `-CF'. Using `-Cr' can - cause strange behavior if, for example, you read from `yyin' - using `stdio' prior to calling the scanner (because the - scanner will miss whatever text your previous reads left in - the `stdio' input buffer). `-Cr' has no effect if you define - `YY_INPUT()' (*note Generated Scanner::). - - The options `-Cf' or `-CF' and `-Cm' do not make sense together - - there is no opportunity for meta-equivalence classes if the table - is not being compressed. Otherwise the options may be freely - mixed, and are cumulative. - - The default setting is `-Cem', which specifies that `flex' should - generate equivalence classes and meta-equivalence classes. This - setting provides the highest degree of table compression. You can - trade off faster-executing scanners at the cost of larger tables - with the following generally being true: - - - slowest & smallest - -Cem - -Cm - -Ce - -C - -C{f,F}e - -C{f,F} - -C{f,F}a - fastest & largest - - Note that scanners with the smallest tables are usually generated - and compiled the quickest, so during development you will usually - want to use the default, maximal compression. - - `-Cfe' is often a good compromise between speed and size for - production scanners. - -`-f, --full, `%option full'' - specifies "fast scanner". No table compression is done and - `stdio' is bypassed. The result is large but fast. This option - is equivalent to `--Cfr' - -`-F, --fast, `%option fast'' - specifies that the _fast_ scanner table representation should be - used (and `stdio' bypassed). This representation is about as fast - as the full table representation `--full', and for some sets of - patterns will be considerably smaller (and for others, larger). In - general, if the pattern set contains both _keywords_ and a - catch-all, _identifier_ rule, such as in the set: - - - "case" return TOK_CASE; - "switch" return TOK_SWITCH; - ... - "default" return TOK_DEFAULT; - [a-z]+ return TOK_ID; - - then you're better off using the full table representation. If - only the _identifier_ rule is present and you then use a hash - table or some such to detect the keywords, you're better off using - `--fast'. - - This option is equivalent to `-CFr'. It cannot be used with - `--c++'. - - - -File: flex.info, Node: Debugging Options, Next: Miscellaneous Options, Prev: Options for Scanner Speed and Size, Up: Scanner Options - -16.5 Debugging Options -====================== - -`-b, --backup, `%option backup'' - Generate backing-up information to `lex.backup'. This is a list of - scanner states which require backing up and the input characters on - which they do so. By adding rules one can remove backing-up - states. If _all_ backing-up states are eliminated and `-Cf' or - `-CF' is used, the generated scanner will run faster (see the - `--perf-report' flag). Only users who wish to squeeze every last - cycle out of their scanners need worry about this option. (*note - Performance::). - -`-d, --debug, `%option debug'' - makes the generated scanner run in "debug" mode. Whenever a - pattern is recognized and the global variable `yy_flex_debug' is - non-zero (which is the default), the scanner will write to - `stderr' a line of the form: - - - -accepting rule at line 53 ("the matched text") - - The line number refers to the location of the rule in the file - defining the scanner (i.e., the file that was fed to flex). - Messages are also generated when the scanner backs up, accepts the - default rule, reaches the end of its input buffer (or encounters a - NUL; at this point, the two look the same as far as the scanner's - concerned), or reaches an end-of-file. - -`-p, --perf-report, `%option perf-report'' - generates a performance report to `stderr'. The report consists of - comments regarding features of the `flex' input file which will - cause a serious loss of performance in the resulting scanner. If - you give the flag twice, you will also get comments regarding - features that lead to minor performance losses. - - Note that the use of `REJECT', and variable trailing context - (*note Limitations::) entails a substantial performance penalty; - use of `yymore()', the `^' operator, and the `--interactive' flag - entail minor performance penalties. - -`-s, --nodefault, `%option nodefault'' - causes the _default rule_ (that unmatched scanner input is echoed - to `stdout)' to be suppressed. If the scanner encounters input - that does not match any of its rules, it aborts with an error. - This option is useful for finding holes in a scanner's rule set. - -`-T, --trace, `%option trace'' - makes `flex' run in "trace" mode. It will generate a lot of - messages to `stderr' concerning the form of the input and the - resultant non-deterministic and deterministic finite automata. - This option is mostly for use in maintaining `flex'. - -`-w, --nowarn, `%option nowarn'' - suppresses warning messages. - -`-v, --verbose, `%option verbose'' - specifies that `flex' should write to `stderr' a summary of - statistics regarding the scanner it generates. Most of the - statistics are meaningless to the casual `flex' user, but the - first line identifies the version of `flex' (same as reported by - `--version'), and the next line the flags used when generating the - scanner, including those that are on by default. - -`--warn, `%option warn'' - warn about certain things. In particular, if the default rule can - be matched but no default rule has been given, the flex will warn - you. We recommend using this option always. - - - -File: flex.info, Node: Miscellaneous Options, Prev: Debugging Options, Up: Scanner Options - -16.6 Miscellaneous Options -========================== - -`-c' - A do-nothing option included for POSIX compliance. - -`-h, -?, --help' - generates a "help" summary of `flex''s options to `stdout' and - then exits. - -`-n' - Another do-nothing option included for POSIX compliance. - -`-V, --version' - prints the version number to `stdout' and exits. - - - -File: flex.info, Node: Performance, Next: Cxx, Prev: Scanner Options, Up: Top - -17 Performance Considerations -***************************** - -The main design goal of `flex' is that it generate high-performance -scanners. It has been optimized for dealing well with large sets of -rules. Aside from the effects on scanner speed of the table compression -`-C' options outlined above, there are a number of options/actions -which degrade performance. These are, from most expensive to least: - - - REJECT - arbitrary trailing context - - pattern sets that require backing up - %option yylineno - %array - - %option interactive - %option always-interactive - - @samp{^} beginning-of-line operator - yymore() - - with the first two all being quite expensive and the last two being -quite cheap. Note also that `unput()' is implemented as a routine call -that potentially does quite a bit of work, while `yyless()' is a -quite-cheap macro. So if you are just putting back some excess text you -scanned, use `yyless()'. - - `REJECT' should be avoided at all costs when performance is -important. It is a particularly expensive option. - - There is one case when `%option yylineno' can be expensive. That is -when your patterns match long tokens that could _possibly_ contain a -newline character. There is no performance penalty for rules that can -not possibly match newlines, since flex does not need to check them for -newlines. In general, you should avoid rules such as `[^f]+', which -match very long tokens, including newlines, and may possibly match your -entire file! A better approach is to separate `[^f]+' into two rules: - - - %option yylineno - %% - [^f\n]+ - \n+ - - The above scanner does not incur a performance penalty. - - Getting rid of backing up is messy and often may be an enormous -amount of work for a complicated scanner. In principal, one begins by -using the `-b' flag to generate a `lex.backup' file. For example, on -the input: - - - %% - foo return TOK_KEYWORD; - foobar return TOK_KEYWORD; - - the file looks like: - - - State #6 is non-accepting - - associated rule line numbers: - 2 3 - out-transitions: [ o ] - jam-transitions: EOF [ \001-n p-\177 ] - - State #8 is non-accepting - - associated rule line numbers: - 3 - out-transitions: [ a ] - jam-transitions: EOF [ \001-` b-\177 ] - - State #9 is non-accepting - - associated rule line numbers: - 3 - out-transitions: [ r ] - jam-transitions: EOF [ \001-q s-\177 ] - - Compressed tables always back up. - - The first few lines tell us that there's a scanner state in which it -can make a transition on an 'o' but not on any other character, and -that in that state the currently scanned text does not match any rule. -The state occurs when trying to match the rules found at lines 2 and 3 -in the input file. If the scanner is in that state and then reads -something other than an 'o', it will have to back up to find a rule -which is matched. With a bit of headscratching one can see that this -must be the state it's in when it has seen `fo'. When this has -happened, if anything other than another `o' is seen, the scanner will -have to back up to simply match the `f' (by the default rule). - - The comment regarding State #8 indicates there's a problem when -`foob' has been scanned. Indeed, on any character other than an `a', -the scanner will have to back up to accept "foo". Similarly, the -comment for State #9 concerns when `fooba' has been scanned and an `r' -does not follow. - - The final comment reminds us that there's no point going to all the -trouble of removing backing up from the rules unless we're using `-Cf' -or `-CF', since there's no performance gain doing so with compressed -scanners. - - The way to remove the backing up is to add "error" rules: - - - %% - foo return TOK_KEYWORD; - foobar return TOK_KEYWORD; - - fooba | - foob | - fo { - /* false alarm, not really a keyword */ - return TOK_ID; - } - - Eliminating backing up among a list of keywords can also be done -using a "catch-all" rule: - - - %% - foo return TOK_KEYWORD; - foobar return TOK_KEYWORD; - - [a-z]+ return TOK_ID; - - This is usually the best solution when appropriate. - - Backing up messages tend to cascade. With a complicated set of rules -it's not uncommon to get hundreds of messages. If one can decipher -them, though, it often only takes a dozen or so rules to eliminate the -backing up (though it's easy to make a mistake and have an error rule -accidentally match a valid token. A possible future `flex' feature -will be to automatically add rules to eliminate backing up). - - It's important to keep in mind that you gain the benefits of -eliminating backing up only if you eliminate _every_ instance of -backing up. Leaving just one means you gain nothing. - - _Variable_ trailing context (where both the leading and trailing -parts do not have a fixed length) entails almost the same performance -loss as `REJECT' (i.e., substantial). So when possible a rule like: - - - %% - mouse|rat/(cat|dog) run(); - - is better written: - - - %% - mouse/cat|dog run(); - rat/cat|dog run(); - - or as - - - %% - mouse|rat/cat run(); - mouse|rat/dog run(); - - Note that here the special '|' action does _not_ provide any -savings, and can even make things worse (*note Limitations::). - - Another area where the user can increase a scanner's performance (and -one that's easier to implement) arises from the fact that the longer the -tokens matched, the faster the scanner will run. This is because with -long tokens the processing of most input characters takes place in the -(short) inner scanning loop, and does not often have to go through the -additional work of setting up the scanning environment (e.g., `yytext') -for the action. Recall the scanner for C comments: - - - %x comment - %% - int line_num = 1; - - "/*" BEGIN(comment); - - <comment>[^*\n]* - <comment>"*"+[^*/\n]* - <comment>\n ++line_num; - <comment>"*"+"/" BEGIN(INITIAL); - - This could be sped up by writing it as: - - - %x comment - %% - int line_num = 1; - - "/*" BEGIN(comment); - - <comment>[^*\n]* - <comment>[^*\n]*\n ++line_num; - <comment>"*"+[^*/\n]* - <comment>"*"+[^*/\n]*\n ++line_num; - <comment>"*"+"/" BEGIN(INITIAL); - - Now instead of each newline requiring the processing of another -action, recognizing the newlines is distributed over the other rules to -keep the matched text as long as possible. Note that _adding_ rules -does _not_ slow down the scanner! The speed of the scanner is -independent of the number of rules or (modulo the considerations given -at the beginning of this section) how complicated the rules are with -regard to operators such as `*' and `|'. - - A final example in speeding up a scanner: suppose you want to scan -through a file containing identifiers and keywords, one per line and -with no other extraneous characters, and recognize all the keywords. A -natural first approach is: - - - %% - asm | - auto | - break | - ... etc ... - volatile | - while /* it's a keyword */ - - .|\n /* it's not a keyword */ - - To eliminate the back-tracking, introduce a catch-all rule: - - - %% - asm | - auto | - break | - ... etc ... - volatile | - while /* it's a keyword */ - - [a-z]+ | - .|\n /* it's not a keyword */ - - Now, if it's guaranteed that there's exactly one word per line, then -we can reduce the total number of matches by a half by merging in the -recognition of newlines with that of the other tokens: - - - %% - asm\n | - auto\n | - break\n | - ... etc ... - volatile\n | - while\n /* it's a keyword */ - - [a-z]+\n | - .|\n /* it's not a keyword */ - - One has to be careful here, as we have now reintroduced backing up -into the scanner. In particular, while _we_ know that there will never -be any characters in the input stream other than letters or newlines, -`flex' can't figure this out, and it will plan for possibly needing to -back up when it has scanned a token like `auto' and then the next -character is something other than a newline or a letter. Previously it -would then just match the `auto' rule and be done, but now it has no -`auto' rule, only a `auto\n' rule. To eliminate the possibility of -backing up, we could either duplicate all rules but without final -newlines, or, since we never expect to encounter such an input and -therefore don't how it's classified, we can introduce one more -catch-all rule, this one which doesn't include a newline: - - - %% - asm\n | - auto\n | - break\n | - ... etc ... - volatile\n | - while\n /* it's a keyword */ - - [a-z]+\n | - [a-z]+ | - .|\n /* it's not a keyword */ - - Compiled with `-Cf', this is about as fast as one can get a `flex' -scanner to go for this particular problem. - - A final note: `flex' is slow when matching `NUL's, particularly when -a token contains multiple `NUL's. It's best to write rules which match -_short_ amounts of text if it's anticipated that the text will often -include `NUL's. - - Another final note regarding performance: as mentioned in *Note -Matching::, dynamically resizing `yytext' to accommodate huge tokens is -a slow process because it presently requires that the (huge) token be -rescanned from the beginning. Thus if performance is vital, you should -attempt to match "large" quantities of text but not "huge" quantities, -where the cutoff between the two is at about 8K characters per token. - - -File: flex.info, Node: Cxx, Next: Reentrant, Prev: Performance, Up: Top - -18 Generating C++ Scanners -************************** - -*IMPORTANT*: the present form of the scanning class is _experimental_ -and may change considerably between major releases. - - `flex' provides two different ways to generate scanners for use with -C++. The first way is to simply compile a scanner generated by `flex' -using a C++ compiler instead of a C compiler. You should not encounter -any compilation errors (*note Reporting Bugs::). You can then use C++ -code in your rule actions instead of C code. Note that the default -input source for your scanner remains `yyin', and default echoing is -still done to `yyout'. Both of these remain `FILE *' variables and not -C++ _streams_. - - You can also use `flex' to generate a C++ scanner class, using the -`-+' option (or, equivalently, `%option c++)', which is automatically -specified if the name of the `flex' executable ends in a '+', such as -`flex++'. When using this option, `flex' defaults to generating the -scanner to the file `lex.yy.cc' instead of `lex.yy.c'. The generated -scanner includes the header file `FlexLexer.h', which defines the -interface to two C++ classes. - - The first class, `FlexLexer', provides an abstract base class -defining the general scanner class interface. It provides the -following member functions: - -`const char* YYText()' - returns the text of the most recently matched token, the - equivalent of `yytext'. - -`int YYLeng()' - returns the length of the most recently matched token, the - equivalent of `yyleng'. - -`int lineno() const' - returns the current input line number (see `%option yylineno)', or - `1' if `%option yylineno' was not used. - -`void set_debug( int flag )' - sets the debugging flag for the scanner, equivalent to assigning to - `yy_flex_debug' (*note Scanner Options::). Note that you must - build the scanner using `%option debug' to include debugging - information in it. - -`int debug() const' - returns the current setting of the debugging flag. - - Also provided are member functions equivalent to -`yy_switch_to_buffer()', `yy_create_buffer()' (though the first -argument is an `istream*' object pointer and not a `FILE*)', -`yy_flush_buffer()', `yy_delete_buffer()', and `yyrestart()' (again, -the first argument is a `istream*' object pointer). - - The second class defined in `FlexLexer.h' is `yyFlexLexer', which is -derived from `FlexLexer'. It defines the following additional member -functions: - -`yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 )' - constructs a `yyFlexLexer' object using the given streams for input - and output. If not specified, the streams default to `cin' and - `cout', respectively. - -`virtual int yylex()' - performs the same role is `yylex()' does for ordinary `flex' - scanners: it scans the input stream, consuming tokens, until a - rule's action returns a value. If you derive a subclass `S' from - `yyFlexLexer' and want to access the member functions and variables - of `S' inside `yylex()', then you need to use `%option - yyclass="S"' to inform `flex' that you will be using that subclass - instead of `yyFlexLexer'. In this case, rather than generating - `yyFlexLexer::yylex()', `flex' generates `S::yylex()' (and also - generates a dummy `yyFlexLexer::yylex()' that calls - `yyFlexLexer::LexerError()' if called). - -`virtual void switch_streams(istream* new_in = 0, ostream* new_out = 0)' - reassigns `yyin' to `new_in' (if non-null) and `yyout' to - `new_out' (if non-null), deleting the previous input buffer if - `yyin' is reassigned. - -`int yylex( istream* new_in, ostream* new_out = 0 )' - first switches the input streams via `switch_streams( new_in, - new_out )' and then returns the value of `yylex()'. - - In addition, `yyFlexLexer' defines the following protected virtual -functions which you can redefine in derived classes to tailor the -scanner: - -`virtual int LexerInput( char* buf, int max_size )' - reads up to `max_size' characters into `buf' and returns the - number of characters read. To indicate end-of-input, return 0 - characters. Note that `interactive' scanners (see the `-B' and - `-I' flags in *Note Scanner Options::) define the macro - `YY_INTERACTIVE'. If you redefine `LexerInput()' and need to take - different actions depending on whether or not the scanner might be - scanning an interactive input source, you can test for the - presence of this name via `#ifdef' statements. - -`virtual void LexerOutput( const char* buf, int size )' - writes out `size' characters from the buffer `buf', which, while - `NUL'-terminated, may also contain internal `NUL's if the - scanner's rules can match text with `NUL's in them. - -`virtual void LexerError( const char* msg )' - reports a fatal error message. The default version of this - function writes the message to the stream `cerr' and exits. - - Note that a `yyFlexLexer' object contains its _entire_ scanning -state. Thus you can use such objects to create reentrant scanners, but -see also *Note Reentrant::. You can instantiate multiple instances of -the same `yyFlexLexer' class, and you can also combine multiple C++ -scanner classes together in the same program using the `-P' option -discussed above. - - Finally, note that the `%array' feature is not available to C++ -scanner classes; you must use `%pointer' (the default). - - Here is an example of a simple C++ scanner: - - - // An example of using the flex C++ scanner class. - - %{ - int mylineno = 0; - %} - - string \"[^\n"]+\" - - ws [ \t]+ - - alpha [A-Za-z] - dig [0-9] - name ({alpha}|{dig}|\$)({alpha}|{dig}|[_.\-/$])* - num1 [-+]?{dig}+\.?([eE][-+]?{dig}+)? - num2 [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)? - number {num1}|{num2} - - %% - - {ws} /* skip blanks and tabs */ - - "/*" { - int c; - - while((c = yyinput()) != 0) - { - if(c == '\n') - ++mylineno; - - else if(c == @samp{*}) - { - if((c = yyinput()) == '/') - break; - else - unput(c); - } - } - } - - {number} cout "number " YYText() '\n'; - - \n mylineno++; - - {name} cout "name " YYText() '\n'; - - {string} cout "string " YYText() '\n'; - - %% - - int main( int /* argc */, char** /* argv */ ) - { - @code{flex}Lexer* lexer = new yyFlexLexer; - while(lexer->yylex() != 0) - ; - return 0; - } - - If you want to create multiple (different) lexer classes, you use the -`-P' flag (or the `prefix=' option) to rename each `yyFlexLexer' to -some other `xxFlexLexer'. You then can include `<FlexLexer.h>' in your -other sources once per lexer class, first renaming `yyFlexLexer' as -follows: - - - #undef yyFlexLexer - #define yyFlexLexer xxFlexLexer - #include <FlexLexer.h> - - #undef yyFlexLexer - #define yyFlexLexer zzFlexLexer - #include <FlexLexer.h> - - if, for example, you used `%option prefix="xx"' for one of your -scanners and `%option prefix="zz"' for the other. - - -File: flex.info, Node: Reentrant, Next: Lex and Posix, Prev: Cxx, Up: Top - -19 Reentrant C Scanners -*********************** - -`flex' has the ability to generate a reentrant C scanner. This is -accomplished by specifying `%option reentrant' (`-R') The generated -scanner is both portable, and safe to use in one or more separate -threads of control. The most common use for reentrant scanners is from -within multi-threaded applications. Any thread may create and execute -a reentrant `flex' scanner without the need for synchronization with -other threads. - -* Menu: - -* Reentrant Uses:: -* Reentrant Overview:: -* Reentrant Example:: -* Reentrant Detail:: -* Reentrant Functions:: - - -File: flex.info, Node: Reentrant Uses, Next: Reentrant Overview, Prev: Reentrant, Up: Reentrant - -19.1 Uses for Reentrant Scanners -================================ - -However, there are other uses for a reentrant scanner. For example, you -could scan two or more files simultaneously to implement a `diff' at -the token level (i.e., instead of at the character level): - - - /* Example of maintaining more than one active scanner. */ - - do { - int tok1, tok2; - - tok1 = yylex( scanner_1 ); - tok2 = yylex( scanner_2 ); - - if( tok1 != tok2 ) - printf("Files are different."); - - } while ( tok1 && tok2 ); - - Another use for a reentrant scanner is recursion. (Note that a -recursive scanner can also be created using a non-reentrant scanner and -buffer states. *Note Multiple Input Buffers::.) - - The following crude scanner supports the `eval' command by invoking -another instance of itself. - - - /* Example of recursive invocation. */ - - %option reentrant - - %% - "eval(".+")" { - yyscan_t scanner; - YY_BUFFER_STATE buf; - - yylex_init( &scanner ); - yytext[yyleng-1] = ' '; - - buf = yy_scan_string( yytext + 5, scanner ); - yylex( scanner ); - - yy_delete_buffer(buf,scanner); - yylex_destroy( scanner ); - } - ... - %% - - -File: flex.info, Node: Reentrant Overview, Next: Reentrant Example, Prev: Reentrant Uses, Up: Reentrant - -19.2 An Overview of the Reentrant API -===================================== - -The API for reentrant scanners is different than for non-reentrant -scanners. Here is a quick overview of the API: - - `%option reentrant' must be specified. - - * All functions take one additional argument: `yyscanner' - - * All global variables are replaced by their macro equivalents. (We - tell you this because it may be important to you during debugging.) - - * `yylex_init' and `yylex_destroy' must be called before and after - `yylex', respectively. - - * Accessor methods (get/set functions) provide access to common - `flex' variables. - - * User-specific data can be stored in `yyextra'. - - -File: flex.info, Node: Reentrant Example, Next: Reentrant Detail, Prev: Reentrant Overview, Up: Reentrant - -19.3 Reentrant Example -====================== - -First, an example of a reentrant scanner: - - /* This scanner prints "//" comments. */ - - %option reentrant stack noyywrap - %x COMMENT - - %% - - "//" yy_push_state( COMMENT, yyscanner); - .|\n - - <COMMENT>\n yy_pop_state( yyscanner ); - <COMMENT>[^\n]+ fprintf( yyout, "%s\n", yytext); - - %% - - int main ( int argc, char * argv[] ) - { - yyscan_t scanner; - - yylex_init ( &scanner ); - yylex ( scanner ); - yylex_destroy ( scanner ); - return 0; - } - - -File: flex.info, Node: Reentrant Detail, Next: Reentrant Functions, Prev: Reentrant Example, Up: Reentrant - -19.4 The Reentrant API in Detail -================================ - -Here are the things you need to do or know to use the reentrant C API of -`flex'. - -* Menu: - -* Specify Reentrant:: -* Extra Reentrant Argument:: -* Global Replacement:: -* Init and Destroy Functions:: -* Accessor Methods:: -* Extra Data:: -* About yyscan_t:: - - -File: flex.info, Node: Specify Reentrant, Next: Extra Reentrant Argument, Prev: Reentrant Detail, Up: Reentrant Detail - -19.4.1 Declaring a Scanner As Reentrant ---------------------------------------- - -%option reentrant (-reentrant) must be specified. - - Notice that `%option reentrant' is specified in the above example -(*note Reentrant Example::. Had this option not been specified, `flex' -would have happily generated a non-reentrant scanner without -complaining. You may explicitly specify `%option noreentrant', if you -do _not_ want a reentrant scanner, although it is not necessary. The -default is to generate a non-reentrant scanner. - - -File: flex.info, Node: Extra Reentrant Argument, Next: Global Replacement, Prev: Specify Reentrant, Up: Reentrant Detail - -19.4.2 The Extra Argument -------------------------- - -All functions take one additional argument: `yyscanner'. - - Notice that the calls to `yy_push_state' and `yy_pop_state' both -have an argument, `yyscanner' , that is not present in a non-reentrant -scanner. Here are the declarations of `yy_push_state' and -`yy_pop_state' in the reentrant scanner: - - - static void yy_push_state ( int new_state , yyscan_t yyscanner ) ; - static void yy_pop_state ( yyscan_t yyscanner ) ; - - Notice that the argument `yyscanner' appears in the declaration of -both functions. In fact, all `flex' functions in a reentrant scanner -have this additional argument. It is always the last argument in the -argument list, it is always of type `yyscan_t' (which is typedef'd to -`void *') and it is always named `yyscanner'. As you may have guessed, -`yyscanner' is a pointer to an opaque data structure encapsulating the -current state of the scanner. For a list of function declarations, see -*Note Reentrant Functions::. Note that preprocessor macros, such as -`BEGIN', `ECHO', and `REJECT', do not take this additional argument. - - -File: flex.info, Node: Global Replacement, Next: Init and Destroy Functions, Prev: Extra Reentrant Argument, Up: Reentrant Detail - -19.4.3 Global Variables Replaced By Macros ------------------------------------------- - -All global variables in traditional flex have been replaced by macro -equivalents. - - Note that in the above example, `yyout' and `yytext' are not plain -variables. These are macros that will expand to their equivalent lvalue. -All of the familiar `flex' globals have been replaced by their macro -equivalents. In particular, `yytext', `yyleng', `yylineno', `yyin', -`yyout', `yyextra', `yylval', and `yylloc' are macros. You may safely -use these macros in actions as if they were plain variables. We only -tell you this so you don't expect to link to these variables -externally. Currently, each macro expands to a member of an internal -struct, e.g., - - - #define yytext (((struct yyguts_t*)yyscanner)->yytext_r) - - One important thing to remember about `yytext' and friends is that -`yytext' is not a global variable in a reentrant scanner, you can not -access it directly from outside an action or from other functions. You -must use an accessor method, e.g., `yyget_text', to accomplish this. -(See below). - - -File: flex.info, Node: Init and Destroy Functions, Next: Accessor Methods, Prev: Global Replacement, Up: Reentrant Detail - -19.4.4 Init and Destroy Functions ---------------------------------- - -`yylex_init' and `yylex_destroy' must be called before and after -`yylex', respectively. - - - int yylex_init ( yyscan_t * ptr_yy_globals ) ; - int yylex_init_extra ( YY_EXTRA_TYPE user_defined, yyscan_t * ptr_yy_globals ) ; - int yylex ( yyscan_t yyscanner ) ; - int yylex_destroy ( yyscan_t yyscanner ) ; - - The function `yylex_init' must be called before calling any other -function. The argument to `yylex_init' is the address of an -uninitialized pointer to be filled in by `yylex_init', overwriting any -previous contents. The function `yylex_init_extra' may be used instead, -taking as its first argument a variable of type `YY_EXTRA_TYPE'. See -the section on yyextra, below, for more details. - - The value stored in `ptr_yy_globals' should thereafter be passed to -`yylex' and `yylex_destroy'. Flex does not save the argument passed to -`yylex_init', so it is safe to pass the address of a local pointer to -`yylex_init' so long as it remains in scope for the duration of all -calls to the scanner, up to and including the call to `yylex_destroy'. - - The function `yylex' should be familiar to you by now. The reentrant -version takes one argument, which is the value returned (via an -argument) by `yylex_init'. Otherwise, it behaves the same as the -non-reentrant version of `yylex'. - - Both `yylex_init' and `yylex_init_extra' returns 0 (zero) on success, -or non-zero on failure, in which case errno is set to one of the -following values: - - * ENOMEM Memory allocation error. *Note memory-management::. - - * EINVAL Invalid argument. - - The function `yylex_destroy' should be called to free resources used -by the scanner. After `yylex_destroy' is called, the contents of -`yyscanner' should not be used. Of course, there is no need to destroy -a scanner if you plan to reuse it. A `flex' scanner (both reentrant -and non-reentrant) may be restarted by calling `yyrestart'. - - Below is an example of a program that creates a scanner, uses it, -then destroys it when done: - - - int main () - { - yyscan_t scanner; - int tok; - - yylex_init(&scanner); - - while ((tok=yylex()) > 0) - printf("tok=%d yytext=%s\n", tok, yyget_text(scanner)); - - yylex_destroy(scanner); - return 0; - } - - -File: flex.info, Node: Accessor Methods, Next: Extra Data, Prev: Init and Destroy Functions, Up: Reentrant Detail - -19.4.5 Accessing Variables with Reentrant Scanners --------------------------------------------------- - -Accessor methods (get/set functions) provide access to common `flex' -variables. - - Many scanners that you build will be part of a larger project. -Portions of your project will need access to `flex' values, such as -`yytext'. In a non-reentrant scanner, these values are global, so -there is no problem accessing them. However, in a reentrant scanner, -there are no global `flex' values. You can not access them directly. -Instead, you must access `flex' values using accessor methods (get/set -functions). Each accessor method is named `yyget_NAME' or `yyset_NAME', -where `NAME' is the name of the `flex' variable you want. For example: - - - /* Set the last character of yytext to NULL. */ - void chop ( yyscan_t scanner ) - { - int len = yyget_leng( scanner ); - yyget_text( scanner )[len - 1] = '\0'; - } - - The above code may be called from within an action like this: - - - %% - .+\n { chop( yyscanner );} - - You may find that `%option header-file' is particularly useful for -generating prototypes of all the accessor functions. *Note -option-header::. - - -File: flex.info, Node: Extra Data, Next: About yyscan_t, Prev: Accessor Methods, Up: Reentrant Detail - -19.4.6 Extra Data ------------------ - -User-specific data can be stored in `yyextra'. - - In a reentrant scanner, it is unwise to use global variables to -communicate with or maintain state between different pieces of your -program. However, you may need access to external data or invoke -external functions from within the scanner actions. Likewise, you may -need to pass information to your scanner (e.g., open file descriptors, -or database connections). In a non-reentrant scanner, the only way to -do this would be through the use of global variables. `Flex' allows -you to store arbitrary, "extra" data in a scanner. This data is -accessible through the accessor methods `yyget_extra' and `yyset_extra' -from outside the scanner, and through the shortcut macro `yyextra' from -within the scanner itself. They are defined as follows: - - - #define YY_EXTRA_TYPE void* - YY_EXTRA_TYPE yyget_extra ( yyscan_t scanner ); - void yyset_extra ( YY_EXTRA_TYPE arbitrary_data , yyscan_t scanner); - - In addition, an extra form of `yylex_init' is provided, -`yylex_init_extra'. This function is provided so that the yyextra value -can be accessed from within the very first yyalloc, used to allocate -the scanner itself. - - By default, `YY_EXTRA_TYPE' is defined as type `void *'. You may -redefine this type using `%option extra-type="your_type"' in the -scanner: - - - /* An example of overriding YY_EXTRA_TYPE. */ - %{ - #include <sys/stat.h> - #include <unistd.h> - %} - %option reentrant - %option extra-type="struct stat *" - %% - - __filesize__ printf( "%ld", yyextra->st_size ); - __lastmod__ printf( "%ld", yyextra->st_mtime ); - %% - void scan_file( char* filename ) - { - yyscan_t scanner; - struct stat buf; - FILE *in; - - in = fopen( filename, "r" ); - stat( filename, &buf ); - - yylex_init_extra( buf, &scanner ); - yyset_in( in, scanner ); - yylex( scanner ); - yylex_destroy( scanner ); - - fclose( in ); - } - - -File: flex.info, Node: About yyscan_t, Prev: Extra Data, Up: Reentrant Detail - -19.4.7 About yyscan_t ---------------------- - -`yyscan_t' is defined as: - - - typedef void* yyscan_t; - - It is initialized by `yylex_init()' to point to an internal -structure. You should never access this value directly. In particular, -you should never attempt to free it (use `yylex_destroy()' instead.) - - -File: flex.info, Node: Reentrant Functions, Prev: Reentrant Detail, Up: Reentrant - -19.5 Functions and Macros Available in Reentrant C Scanners -=========================================================== - -The following Functions are available in a reentrant scanner: - - - char *yyget_text ( yyscan_t scanner ); - int yyget_leng ( yyscan_t scanner ); - FILE *yyget_in ( yyscan_t scanner ); - FILE *yyget_out ( yyscan_t scanner ); - int yyget_lineno ( yyscan_t scanner ); - YY_EXTRA_TYPE yyget_extra ( yyscan_t scanner ); - int yyget_debug ( yyscan_t scanner ); - - void yyset_debug ( int flag, yyscan_t scanner ); - void yyset_in ( FILE * in_str , yyscan_t scanner ); - void yyset_out ( FILE * out_str , yyscan_t scanner ); - void yyset_lineno ( int line_number , yyscan_t scanner ); - void yyset_extra ( YY_EXTRA_TYPE user_defined , yyscan_t scanner ); - - There are no "set" functions for yytext and yyleng. This is -intentional. - - The following Macro shortcuts are available in actions in a reentrant -scanner: - - - yytext - yyleng - yyin - yyout - yylineno - yyextra - yy_flex_debug - - In a reentrant C scanner, support for yylineno is always present -(i.e., you may access yylineno), but the value is never modified by -`flex' unless `%option yylineno' is enabled. This is to allow the user -to maintain the line count independently of `flex'. - - The following functions and macros are made available when `%option -bison-bridge' (`--bison-bridge') is specified: - - - YYSTYPE * yyget_lval ( yyscan_t scanner ); - void yyset_lval ( YYSTYPE * yylvalp , yyscan_t scanner ); - yylval - - The following functions and macros are made available when `%option -bison-locations' (`--bison-locations') is specified: - - - YYLTYPE *yyget_lloc ( yyscan_t scanner ); - void yyset_lloc ( YYLTYPE * yyllocp , yyscan_t scanner ); - yylloc - - Support for yylval assumes that `YYSTYPE' is a valid type. Support -for yylloc assumes that `YYSLYPE' is a valid type. Typically, these -types are generated by `bison', and are included in section 1 of the -`flex' input. - - -File: flex.info, Node: Lex and Posix, Next: Memory Management, Prev: Reentrant, Up: Top - -20 Incompatibilities with Lex and Posix -*************************************** - -`flex' is a rewrite of the AT&T Unix _lex_ tool (the two -implementations do not share any code, though), with some extensions and -incompatibilities, both of which are of concern to those who wish to -write scanners acceptable to both implementations. `flex' is fully -compliant with the POSIX `lex' specification, except that when using -`%pointer' (the default), a call to `unput()' destroys the contents of -`yytext', which is counter to the POSIX specification. In this section -we discuss all of the known areas of incompatibility between `flex', -AT&T `lex', and the POSIX specification. `flex''s `-l' option turns on -maximum compatibility with the original AT&T `lex' implementation, at -the cost of a major loss in the generated scanner's performance. We -note below which incompatibilities can be overcome using the `-l' -option. `flex' is fully compatible with `lex' with the following -exceptions: - - * The undocumented `lex' scanner internal variable `yylineno' is not - supported unless `-l' or `%option yylineno' is used. - - * `yylineno' should be maintained on a per-buffer basis, rather than - a per-scanner (single global variable) basis. - - * `yylineno' is not part of the POSIX specification. - - * The `input()' routine is not redefinable, though it may be called - to read characters following whatever has been matched by a rule. - If `input()' encounters an end-of-file the normal `yywrap()' - processing is done. A "real" end-of-file is returned by `input()' - as `EOF'. - - * Input is instead controlled by defining the `YY_INPUT()' macro. - - * The `flex' restriction that `input()' cannot be redefined is in - accordance with the POSIX specification, which simply does not - specify any way of controlling the scanner's input other than by - making an initial assignment to `yyin'. - - * The `unput()' routine is not redefinable. This restriction is in - accordance with POSIX. - - * `flex' scanners are not as reentrant as `lex' scanners. In - particular, if you have an interactive scanner and an interrupt - handler which long-jumps out of the scanner, and the scanner is - subsequently called again, you may get the following message: - - - fatal @code{flex} scanner internal error--end of buffer missed - - To reenter the scanner, first use: - - - yyrestart( yyin ); - - Note that this call will throw away any buffered input; usually - this isn't a problem with an interactive scanner. *Note - Reentrant::, for `flex''s reentrant API. - - * Also note that `flex' C++ scanner classes _are_ reentrant, so if - using C++ is an option for you, you should use them instead. - *Note Cxx::, and *Note Reentrant:: for details. - - * `output()' is not supported. Output from the ECHO macro is done - to the file-pointer `yyout' (default `stdout)'. - - * `output()' is not part of the POSIX specification. - - * `lex' does not support exclusive start conditions (%x), though they - are in the POSIX specification. - - * When definitions are expanded, `flex' encloses them in parentheses. - With `lex', the following: - - - NAME [A-Z][A-Z0-9]* - %% - foo{NAME}? printf( "Found it\n" ); - %% - - will not match the string `foo' because when the macro is expanded - the rule is equivalent to `foo[A-Z][A-Z0-9]*?' and the precedence - is such that the `?' is associated with `[A-Z0-9]*'. With `flex', - the rule will be expanded to `foo([A-Z][A-Z0-9]*)?' and so the - string `foo' will match. - - * Note that if the definition begins with `^' or ends with `$' then - it is _not_ expanded with parentheses, to allow these operators to - appear in definitions without losing their special meanings. But - the `<s>', `/', and `<<EOF>>' operators cannot be used in a `flex' - definition. - - * Using `-l' results in the `lex' behavior of no parentheses around - the definition. - - * The POSIX specification is that the definition be enclosed in - parentheses. - - * Some implementations of `lex' allow a rule's action to begin on a - separate line, if the rule's pattern has trailing whitespace: - - - %% - foo|bar<space here> - { foobar_action();} - - `flex' does not support this feature. - - * The `lex' `%r' (generate a Ratfor scanner) option is not - supported. It is not part of the POSIX specification. - - * After a call to `unput()', _yytext_ is undefined until the next - token is matched, unless the scanner was built using `%array'. - This is not the case with `lex' or the POSIX specification. The - `-l' option does away with this incompatibility. - - * The precedence of the `{,}' (numeric range) operator is different. - The AT&T and POSIX specifications of `lex' interpret `abc{1,3}' - as match one, two, or three occurrences of `abc'", whereas `flex' - interprets it as "match `ab' followed by one, two, or three - occurrences of `c'". The `-l' and `--posix' options do away with - this incompatibility. - - * The precedence of the `^' operator is different. `lex' interprets - `^foo|bar' as "match either 'foo' at the beginning of a line, or - 'bar' anywhere", whereas `flex' interprets it as "match either - `foo' or `bar' if they come at the beginning of a line". The - latter is in agreement with the POSIX specification. - - * The special table-size declarations such as `%a' supported by - `lex' are not required by `flex' scanners.. `flex' ignores them. - - * The name `FLEX_SCANNER' is `#define''d so scanners may be written - for use with either `flex' or `lex'. Scanners also include - `YY_FLEX_MAJOR_VERSION', `YY_FLEX_MINOR_VERSION' and - `YY_FLEX_SUBMINOR_VERSION' indicating which version of `flex' - generated the scanner. For example, for the 2.5.22 release, these - defines would be 2, 5 and 22 respectively. If the version of - `flex' being used is a beta version, then the symbol `FLEX_BETA' - is defined. - - * The symbols `[[' and `]]' in the code sections of the input may - conflict with the m4 delimiters. *Note M4 Dependency::. - - - The following `flex' features are not included in `lex' or the POSIX -specification: - - * C++ scanners - - * %option - - * start condition scopes - - * start condition stacks - - * interactive/non-interactive scanners - - * yy_scan_string() and friends - - * yyterminate() - - * yy_set_interactive() - - * yy_set_bol() - - * YY_AT_BOL() <<EOF>> - - * <*> - - * YY_DECL - - * YY_START - - * YY_USER_ACTION - - * YY_USER_INIT - - * #line directives - - * %{}'s around actions - - * reentrant C API - - * multiple actions on a line - - * almost all of the `flex' command-line options - - The feature "multiple actions on a line" refers to the fact that -with `flex' you can put multiple actions on the same line, separated -with semi-colons, while with `lex', the following: - - - foo handle_foo(); ++num_foos_seen; - - is (rather surprisingly) truncated to - - - foo handle_foo(); - - `flex' does not truncate the action. Actions that are not enclosed -in braces are simply terminated at the end of the line. - - -File: flex.info, Node: Memory Management, Next: Serialized Tables, Prev: Lex and Posix, Up: Top - -21 Memory Management -******************** - -This chapter describes how flex handles dynamic memory, and how you can -override the default behavior. - -* Menu: - -* The Default Memory Management:: -* Overriding The Default Memory Management:: -* A Note About yytext And Memory:: - - -File: flex.info, Node: The Default Memory Management, Next: Overriding The Default Memory Management, Prev: Memory Management, Up: Memory Management - -21.1 The Default Memory Management -================================== - -Flex allocates dynamic memory during initialization, and once in a -while from within a call to yylex(). Initialization takes place during -the first call to yylex(). Thereafter, flex may reallocate more memory -if it needs to enlarge a buffer. As of version 2.5.9 Flex will clean up -all memory when you call `yylex_destroy' *Note faq-memory-leak::. - - Flex allocates dynamic memory for four purposes, listed below (1) - -16kB for the input buffer. - Flex allocates memory for the character buffer used to perform - pattern matching. Flex must read ahead from the input stream and - store it in a large character buffer. This buffer is typically - the largest chunk of dynamic memory flex consumes. This buffer - will grow if necessary, doubling the size each time. Flex frees - this memory when you call yylex_destroy(). The default size of - this buffer (16384 bytes) is almost always too large. The ideal - size for this buffer is the length of the longest token expected, - in bytes, plus a little more. Flex will allocate a few extra - bytes for housekeeping. Currently, to override the size of the - input buffer you must `#define YY_BUF_SIZE' to whatever number of - bytes you want. We don't plan to change this in the near future, - but we reserve the right to do so if we ever add a more robust - memory management API. - -64kb for the REJECT state. This will only be allocated if you use REJECT. - The size is the large enough to hold the same number of states as - characters in the input buffer. If you override the size of the - input buffer (via `YY_BUF_SIZE'), then you automatically override - the size of this buffer as well. - -100 bytes for the start condition stack. - Flex allocates memory for the start condition stack. This is the - stack used for pushing start states, i.e., with yy_push_state(). - It will grow if necessary. Since the states are simply integers, - this stack doesn't consume much memory. This stack is not present - if `%option stack' is not specified. You will rarely need to tune - this buffer. The ideal size for this stack is the maximum depth - expected. The memory for this stack is automatically destroyed - when you call yylex_destroy(). *Note option-stack::. - -40 bytes for each YY_BUFFER_STATE. - Flex allocates memory for each YY_BUFFER_STATE. The buffer state - itself is about 40 bytes, plus an additional large character - buffer (described above.) The initial buffer state is created - during initialization, and with each call to yy_create_buffer(). - You can't tune the size of this, but you can tune the character - buffer as described above. Any buffer state that you explicitly - create by calling yy_create_buffer() is _NOT_ destroyed - automatically. You must call yy_delete_buffer() to free the - memory. The exception to this rule is that flex will delete the - current buffer automatically when you call yylex_destroy(). If you - delete the current buffer, be sure to set it to NULL. That way, - flex will not try to delete the buffer a second time (possibly - crashing your program!) At the time of this writing, flex does not - provide a growable stack for the buffer states. You have to - manage that yourself. *Note Multiple Input Buffers::. - -84 bytes for the reentrant scanner guts - Flex allocates about 84 bytes for the reentrant scanner structure - when you call yylex_init(). It is destroyed when the user calls - yylex_destroy(). - - - ---------- Footnotes ---------- - - (1) The quantities given here are approximate, and may vary due to -host architecture, compiler configuration, or due to future -enhancements to flex. - - -File: flex.info, Node: Overriding The Default Memory Management, Next: A Note About yytext And Memory, Prev: The Default Memory Management, Up: Memory Management - -21.2 Overriding The Default Memory Management -============================================= - -Flex calls the functions `yyalloc', `yyrealloc', and `yyfree' when it -needs to allocate or free memory. By default, these functions are -wrappers around the standard C functions, `malloc', `realloc', and -`free', respectively. You can override the default implementations by -telling flex that you will provide your own implementations. - - To override the default implementations, you must do two things: - - 1. Suppress the default implementations by specifying one or more of - the following options: - - * `%option noyyalloc' - - * `%option noyyrealloc' - - * `%option noyyfree'. - - 2. Provide your own implementation of the following functions: (1) - - - // For a non-reentrant scanner - void * yyalloc (size_t bytes); - void * yyrealloc (void * ptr, size_t bytes); - void yyfree (void * ptr); - - // For a reentrant scanner - void * yyalloc (size_t bytes, void * yyscanner); - void * yyrealloc (void * ptr, size_t bytes, void * yyscanner); - void yyfree (void * ptr, void * yyscanner); - - - In the following example, we will override all three memory -routines. We assume that there is a custom allocator with garbage -collection. In order to make this example interesting, we will use a -reentrant scanner, passing a pointer to the custom allocator through -`yyextra'. - - - %{ - #include "some_allocator.h" - %} - - /* Suppress the default implementations. */ - %option noyyalloc noyyrealloc noyyfree - %option reentrant - - /* Initialize the allocator. */ - #define YY_EXTRA_TYPE struct allocator* - #define YY_USER_INIT yyextra = allocator_create(); - - %% - .|\n ; - %% - - /* Provide our own implementations. */ - void * yyalloc (size_t bytes, void* yyscanner) { - return allocator_alloc (yyextra, bytes); - } - - void * yyrealloc (void * ptr, size_t bytes, void* yyscanner) { - return allocator_realloc (yyextra, bytes); - } - - void yyfree (void * ptr, void * yyscanner) { - /* Do nothing -- we leave it to the garbage collector. */ - } - - ---------- Footnotes ---------- - - (1) It is not necessary to override all (or any) of the memory -management routines. You may, for example, override `yyrealloc', but -not `yyfree' or `yyalloc'. - - -File: flex.info, Node: A Note About yytext And Memory, Prev: Overriding The Default Memory Management, Up: Memory Management - -21.3 A Note About yytext And Memory -=================================== - -When flex finds a match, `yytext' points to the first character of the -match in the input buffer. The string itself is part of the input -buffer, and is _NOT_ allocated separately. The value of yytext will be -overwritten the next time yylex() is called. In short, the value of -yytext is only valid from within the matched rule's action. - - Often, you want the value of yytext to persist for later processing, -i.e., by a parser with non-zero lookahead. In order to preserve yytext, -you will have to copy it with strdup() or a similar function. But this -introduces some headache because your parser is now responsible for -freeing the copy of yytext. If you use a yacc or bison parser, -(commonly used with flex), you will discover that the error recovery -mechanisms can cause memory to be leaked. - - To prevent memory leaks from strdup'd yytext, you will have to track -the memory somehow. Our experience has shown that a garbage collection -mechanism or a pooled memory mechanism will save you a lot of grief -when writing parsers. - - -File: flex.info, Node: Serialized Tables, Next: Diagnostics, Prev: Memory Management, Up: Top - -22 Serialized Tables -******************** - -A `flex' scanner has the ability to save the DFA tables to a file, and -load them at runtime when needed. The motivation for this feature is -to reduce the runtime memory footprint. Traditionally, these tables -have been compiled into the scanner as C arrays, and are sometimes -quite large. Since the tables are compiled into the scanner, the -memory used by the tables can never be freed. This is a waste of -memory, especially if an application uses several scanners, but none of -them at the same time. - - The serialization feature allows the tables to be loaded at runtime, -before scanning begins. The tables may be discarded when scanning is -finished. - -* Menu: - -* Creating Serialized Tables:: -* Loading and Unloading Serialized Tables:: -* Tables File Format:: - - -File: flex.info, Node: Creating Serialized Tables, Next: Loading and Unloading Serialized Tables, Prev: Serialized Tables, Up: Serialized Tables - -22.1 Creating Serialized Tables -=============================== - -You may create a scanner with serialized tables by specifying: - - - %option tables-file=FILE - or - --tables-file=FILE - - These options instruct flex to save the DFA tables to the file FILE. -The tables will _not_ be embedded in the generated scanner. The scanner -will not function on its own. The scanner will be dependent upon the -serialized tables. You must load the tables from this file at runtime -before you can scan anything. - - If you do not specify a filename to `--tables-file', the tables will -be saved to `lex.yy.tables', where `yy' is the appropriate prefix. - - If your project uses several different scanners, you can concatenate -the serialized tables into one file, and flex will find the correct set -of tables, using the scanner prefix as part of the lookup key. An -example follows: - - - $ flex --tables-file --prefix=cpp cpp.l - $ flex --tables-file --prefix=c c.l - $ cat lex.cpp.tables lex.c.tables > all.tables - - The above example created two scanners, `cpp', and `c'. Since we did -not specify a filename, the tables were serialized to `lex.c.tables' and -`lex.cpp.tables', respectively. Then, we concatenated the two files -together into `all.tables', which we will distribute with our project. -At runtime, we will open the file and tell flex to load the tables from -it. Flex will find the correct tables automatically. (See next -section). - - -File: flex.info, Node: Loading and Unloading Serialized Tables, Next: Tables File Format, Prev: Creating Serialized Tables, Up: Serialized Tables - -22.2 Loading and Unloading Serialized Tables -============================================ - -If you've built your scanner with `%option tables-file', then you must -load the scanner tables at runtime. This can be accomplished with the -following function: - - -- Function: int yytables_fload (FILE* FP [, yyscan_t SCANNER]) - Locates scanner tables in the stream pointed to by FP and loads - them. Memory for the tables is allocated via `yyalloc'. You must - call this function before the first call to `yylex'. The argument - SCANNER only appears in the reentrant scanner. This function - returns `0' (zero) on success, or non-zero on error. - - The loaded tables are *not* automatically destroyed (unloaded) when -you call `yylex_destroy'. The reason is that you may create several -scanners of the same type (in a reentrant scanner), each of which needs -access to these tables. To avoid a nasty memory leak, you must call -the following function: - - -- Function: int yytables_destroy ([yyscan_t SCANNER]) - Unloads the scanner tables. The tables must be loaded again before - you can scan any more data. The argument SCANNER only appears in - the reentrant scanner. This function returns `0' (zero) on - success, or non-zero on error. - - *The functions `yytables_fload' and `yytables_destroy' are not -thread-safe.* You must ensure that these functions are called exactly -once (for each scanner type) in a threaded program, before any thread -calls `yylex'. After the tables are loaded, they are never written to, -and no thread protection is required thereafter - until you destroy -them. - - -File: flex.info, Node: Tables File Format, Prev: Loading and Unloading Serialized Tables, Up: Serialized Tables - -22.3 Tables File Format -======================= - -This section defines the file format of serialized `flex' tables. - - The tables format allows for one or more sets of tables to be -specified, where each set corresponds to a given scanner. Scanners are -indexed by name, as described below. The file format is as follows: - - - TABLE SET 1 - +-------------------------------+ - Header | uint32 th_magic; | - | uint32 th_hsize; | - | uint32 th_ssize; | - | uint16 th_flags; | - | char th_version[]; | - | char th_name[]; | - | uint8 th_pad64[]; | - +-------------------------------+ - Table 1 | uint16 td_id; | - | uint16 td_flags; | - | uint32 td_lolen; | - | uint32 td_hilen; | - | void td_data[]; | - | uint8 td_pad64[]; | - +-------------------------------+ - Table 2 | | - . . . - . . . - . . . - . . . - Table n | | - +-------------------------------+ - TABLE SET 2 - . - . - . - TABLE SET N - - The above diagram shows that a complete set of tables consists of a -header followed by multiple individual tables. Furthermore, multiple -complete sets may be present in the same file, each set with its own -header and tables. The sets are contiguous in the file. The only way to -know if another set follows is to check the next four bytes for the -magic number (or check for EOF). The header and tables sections are -padded to 64-bit boundaries. Below we describe each field in detail. -This format does not specify how the scanner will expand the given -data, i.e., data may be serialized as int8, but expanded to an int32 -array at runtime. This is to reduce the size of the serialized data -where possible. Remember, _all integer values are in network byte -order_. - -Fields of a table header: - -`th_magic' - Magic number, always 0xF13C57B1. - -`th_hsize' - Size of this entire header, in bytes, including all fields plus - any padding. - -`th_ssize' - Size of this entire set, in bytes, including the header, all - tables, plus any padding. - -`th_flags' - Bit flags for this table set. Currently unused. - -`th_version[]' - Flex version in NULL-terminated string format. e.g., `2.5.13a'. - This is the version of flex that was used to create the serialized - tables. - -`th_name[]' - Contains the name of this table set. The default is `yytables', - and is prefixed accordingly, e.g., `footables'. Must be - NULL-terminated. - -`th_pad64[]' - Zero or more NULL bytes, padding the entire header to the next - 64-bit boundary as calculated from the beginning of the header. - -Fields of a table: - -`td_id' - Specifies the table identifier. Possible values are: - `YYTD_ID_ACCEPT (0x01)' - `yy_accept' - - `YYTD_ID_BASE (0x02)' - `yy_base' - - `YYTD_ID_CHK (0x03)' - `yy_chk' - - `YYTD_ID_DEF (0x04)' - `yy_def' - - `YYTD_ID_EC (0x05)' - `yy_ec ' - - `YYTD_ID_META (0x06)' - `yy_meta' - - `YYTD_ID_NUL_TRANS (0x07)' - `yy_NUL_trans' - - `YYTD_ID_NXT (0x08)' - `yy_nxt'. This array may be two dimensional. See the - `td_hilen' field below. - - `YYTD_ID_RULE_CAN_MATCH_EOL (0x09)' - `yy_rule_can_match_eol' - - `YYTD_ID_START_STATE_LIST (0x0A)' - `yy_start_state_list'. This array is handled specially - because it is an array of pointers to structs. See the - `td_flags' field below. - - `YYTD_ID_TRANSITION (0x0B)' - `yy_transition'. This array is handled specially because it - is an array of structs. See the `td_lolen' field below. - - `YYTD_ID_ACCLIST (0x0C)' - `yy_acclist' - -`td_flags' - Bit flags describing how to interpret the data in `td_data'. The - data arrays are one-dimensional by default, but may be two - dimensional as specified in the `td_hilen' field. - - `YYTD_DATA8 (0x01)' - The data is serialized as an array of type int8. - - `YYTD_DATA16 (0x02)' - The data is serialized as an array of type int16. - - `YYTD_DATA32 (0x04)' - The data is serialized as an array of type int32. - - `YYTD_PTRANS (0x08)' - The data is a list of indexes of entries in the expanded - `yy_transition' array. Each index should be expanded to a - pointer to the corresponding entry in the `yy_transition' - array. We count on the fact that the `yy_transition' array - has already been seen. - - `YYTD_STRUCT (0x10)' - The data is a list of yy_trans_info structs, each of which - consists of two integers. There is no padding between struct - elements or between structs. The type of each member is - determined by the `YYTD_DATA*' bits. - -`td_lolen' - Specifies the number of elements in the lowest dimension array. If - this is a one-dimensional array, then it is simply the number of - elements in this array. The element size is determined by the - `td_flags' field. - -`td_hilen' - If `td_hilen' is non-zero, then the data is a two-dimensional - array. Otherwise, the data is a one-dimensional array. `td_hilen' - contains the number of elements in the higher dimensional array, - and `td_lolen' contains the number of elements in the lowest - dimension. - - Conceptually, `td_data' is either `sometype td_data[td_lolen]', or - `sometype td_data[td_hilen][td_lolen]', where `sometype' is - specified by the `td_flags' field. It is possible for both - `td_lolen' and `td_hilen' to be zero, in which case `td_data' is a - zero length array, and no data is loaded, i.e., this table is - simply skipped. Flex does not currently generate tables of zero - length. - -`td_data[]' - The table data. This array may be a one- or two-dimensional array, - of type `int8', `int16', `int32', `struct yy_trans_info', or - `struct yy_trans_info*', depending upon the values in the - `td_flags', `td_lolen', and `td_hilen' fields. - -`td_pad64[]' - Zero or more NULL bytes, padding the entire table to the next - 64-bit boundary as calculated from the beginning of this table. - - -File: flex.info, Node: Diagnostics, Next: Limitations, Prev: Serialized Tables, Up: Top - -23 Diagnostics -************** - -The following is a list of `flex' diagnostic messages: - - * `warning, rule cannot be matched' indicates that the given rule - cannot be matched because it follows other rules that will always - match the same text as it. For example, in the following `foo' - cannot be matched because it comes after an identifier "catch-all" - rule: - - - [a-z]+ got_identifier(); - foo got_foo(); - - Using `REJECT' in a scanner suppresses this warning. - - * `warning, -s option given but default rule can be matched' means - that it is possible (perhaps only in a particular start condition) - that the default rule (match any single character) is the only one - that will match a particular input. Since `-s' was given, - presumably this is not intended. - - * `reject_used_but_not_detected undefined' or - `yymore_used_but_not_detected undefined'. These errors can occur - at compile time. They indicate that the scanner uses `REJECT' or - `yymore()' but that `flex' failed to notice the fact, meaning that - `flex' scanned the first two sections looking for occurrences of - these actions and failed to find any, but somehow you snuck some in - (via a #include file, for example). Use `%option reject' or - `%option yymore' to indicate to `flex' that you really do use - these features. - - * `flex scanner jammed'. a scanner compiled with `-s' has - encountered an input string which wasn't matched by any of its - rules. This error can also occur due to internal problems. - - * `token too large, exceeds YYLMAX'. your scanner uses `%array' and - one of its rules matched a string longer than the `YYLMAX' - constant (8K bytes by default). You can increase the value by - #define'ing `YYLMAX' in the definitions section of your `flex' - input. - - * `scanner requires -8 flag to use the character 'x''. Your scanner - specification includes recognizing the 8-bit character `'x'' and - you did not specify the -8 flag, and your scanner defaulted to - 7-bit because you used the `-Cf' or `-CF' table compression - options. See the discussion of the `-7' flag, *Note Scanner - Options::, for details. - - * `flex scanner push-back overflow'. you used `unput()' to push back - so much text that the scanner's buffer could not hold both the - pushed-back text and the current token in `yytext'. Ideally the - scanner should dynamically resize the buffer in this case, but at - present it does not. - - * `input buffer overflow, can't enlarge buffer because scanner uses - REJECT'. the scanner was working on matching an extremely large - token and needed to expand the input buffer. This doesn't work - with scanners that use `REJECT'. - - * `fatal flex scanner internal error--end of buffer missed'. This can - occur in a scanner which is reentered after a long-jump has jumped - out (or over) the scanner's activation frame. Before reentering - the scanner, use: - - yyrestart( yyin ); - or, as noted above, switch to using the C++ scanner class. - - * `too many start conditions in <> construct!' you listed more start - conditions in a <> construct than exist (so you must have listed at - least one of them twice). - - -File: flex.info, Node: Limitations, Next: Bibliography, Prev: Diagnostics, Up: Top - -24 Limitations -************** - -Some trailing context patterns cannot be properly matched and generate -warning messages (`dangerous trailing context'). These are patterns -where the ending of the first part of the rule matches the beginning of -the second part, such as `zx*/xy*', where the 'x*' matches the 'x' at -the beginning of the trailing context. (Note that the POSIX draft -states that the text matched by such patterns is undefined.) For some -trailing context rules, parts which are actually fixed-length are not -recognized as such, leading to the abovementioned performance loss. In -particular, parts using `|' or `{n}' (such as `foo{3}') are always -considered variable-length. Combining trailing context with the -special `|' action can result in _fixed_ trailing context being turned -into the more expensive _variable_ trailing context. For example, in -the following: - - - %% - abc | - xyz/def - - Use of `unput()' invalidates yytext and yyleng, unless the `%array' -directive or the `-l' option has been used. Pattern-matching of `NUL's -is substantially slower than matching other characters. Dynamic -resizing of the input buffer is slow, as it entails rescanning all the -text matched so far by the current (generally huge) token. Due to both -buffering of input and read-ahead, you cannot intermix calls to -`<stdio.h>' routines, such as, getchar(), with `flex' rules and expect -it to work. Call `input()' instead. The total table entries listed by -the `-v' flag excludes the number of table entries needed to determine -what rule has been matched. The number of entries is equal to the -number of DFA states if the scanner does not use `REJECT', and somewhat -greater than the number of states if it does. `REJECT' cannot be used -with the `-f' or `-F' options. - - The `flex' internal algorithms need documentation. - - -File: flex.info, Node: Bibliography, Next: FAQ, Prev: Limitations, Up: Top - -25 Additional Reading -********************* - -You may wish to read more about the following programs: - * lex - - * yacc - - * sed - - * awk - - The following books may contain material of interest: - - John Levine, Tony Mason, and Doug Brown, _Lex & Yacc_, O'Reilly and -Associates. Be sure to get the 2nd edition. - - M. E. Lesk and E. Schmidt, _LEX - Lexical Analyzer Generator_ - - Alfred Aho, Ravi Sethi and Jeffrey Ullman, _Compilers: Principles, -Techniques and Tools_, Addison-Wesley (1986). Describes the -pattern-matching techniques used by `flex' (deterministic finite -automata). - - -File: flex.info, Node: FAQ, Next: Appendices, Prev: Bibliography, Up: Top - -FAQ -*** - -From time to time, the `flex' maintainer receives certain questions. -Rather than repeat answers to well-understood problems, we publish them -here. - -* Menu: - -* When was flex born?:: -* How do I expand backslash-escape sequences in C-style quoted strings?:: -* Why do flex scanners call fileno if it is not ANSI compatible?:: -* Does flex support recursive pattern definitions?:: -* How do I skip huge chunks of input (tens of megabytes) while using flex?:: -* Flex is not matching my patterns in the same order that I defined them.:: -* My actions are executing out of order or sometimes not at all.:: -* How can I have multiple input sources feed into the same scanner at the same time?:: -* Can I build nested parsers that work with the same input file?:: -* How can I match text only at the end of a file?:: -* How can I make REJECT cascade across start condition boundaries?:: -* Why cant I use fast or full tables with interactive mode?:: -* How much faster is -F or -f than -C?:: -* If I have a simple grammar cant I just parse it with flex?:: -* Why doesn't yyrestart() set the start state back to INITIAL?:: -* How can I match C-style comments?:: -* The period isn't working the way I expected.:: -* Can I get the flex manual in another format?:: -* Does there exist a "faster" NDFA->DFA algorithm?:: -* How does flex compile the DFA so quickly?:: -* How can I use more than 8192 rules?:: -* How do I abandon a file in the middle of a scan and switch to a new file?:: -* How do I execute code only during initialization (only before the first scan)?:: -* How do I execute code at termination?:: -* Where else can I find help?:: -* Can I include comments in the "rules" section of the file?:: -* I get an error about undefined yywrap().:: -* How can I change the matching pattern at run time?:: -* How can I expand macros in the input?:: -* How can I build a two-pass scanner?:: -* How do I match any string not matched in the preceding rules?:: -* I am trying to port code from AT&T lex that uses yysptr and yysbuf.:: -* Is there a way to make flex treat NULL like a regular character?:: -* Whenever flex can not match the input it says "flex scanner jammed".:: -* Why doesn't flex have non-greedy operators like perl does?:: -* Memory leak - 16386 bytes allocated by malloc.:: -* How do I track the byte offset for lseek()?:: -* How do I use my own I/O classes in a C++ scanner?:: -* How do I skip as many chars as possible?:: -* deleteme00:: -* Are certain equivalent patterns faster than others?:: -* Is backing up a big deal?:: -* Can I fake multi-byte character support?:: -* deleteme01:: -* Can you discuss some flex internals?:: -* unput() messes up yy_at_bol:: -* The | operator is not doing what I want:: -* Why can't flex understand this variable trailing context pattern?:: -* The ^ operator isn't working:: -* Trailing context is getting confused with trailing optional patterns:: -* Is flex GNU or not?:: -* ERASEME53:: -* I need to scan if-then-else blocks and while loops:: -* ERASEME55:: -* ERASEME56:: -* ERASEME57:: -* Is there a repository for flex scanners?:: -* How can I conditionally compile or preprocess my flex input file?:: -* Where can I find grammars for lex and yacc?:: -* I get an end-of-buffer message for each character scanned.:: -* unnamed-faq-62:: -* unnamed-faq-63:: -* unnamed-faq-64:: -* unnamed-faq-65:: -* unnamed-faq-66:: -* unnamed-faq-67:: -* unnamed-faq-68:: -* unnamed-faq-69:: -* unnamed-faq-70:: -* unnamed-faq-71:: -* unnamed-faq-72:: -* unnamed-faq-73:: -* unnamed-faq-74:: -* unnamed-faq-75:: -* unnamed-faq-76:: -* unnamed-faq-77:: -* unnamed-faq-78:: -* unnamed-faq-79:: -* unnamed-faq-80:: -* unnamed-faq-81:: -* unnamed-faq-82:: -* unnamed-faq-83:: -* unnamed-faq-84:: -* unnamed-faq-85:: -* unnamed-faq-86:: -* unnamed-faq-87:: -* unnamed-faq-88:: -* unnamed-faq-90:: -* unnamed-faq-91:: -* unnamed-faq-92:: -* unnamed-faq-93:: -* unnamed-faq-94:: -* unnamed-faq-95:: -* unnamed-faq-96:: -* unnamed-faq-97:: -* unnamed-faq-98:: -* unnamed-faq-99:: -* unnamed-faq-100:: -* unnamed-faq-101:: -* What is the difference between YYLEX_PARAM and YY_DECL?:: -* Why do I get "conflicting types for yylex" error?:: -* How do I access the values set in a Flex action from within a Bison action?:: - - -File: flex.info, Node: When was flex born?, Next: How do I expand backslash-escape sequences in C-style quoted strings?, Up: FAQ - -When was flex born? -=================== - -Vern Paxson took over the `Software Tools' lex project from Jef -Poskanzer in 1982. At that point it was written in Ratfor. Around -1987 or so, Paxson translated it into C, and a legend was born :-). - - -File: flex.info, Node: How do I expand backslash-escape sequences in C-style quoted strings?, Next: Why do flex scanners call fileno if it is not ANSI compatible?, Prev: When was flex born?, Up: FAQ - -How do I expand backslash-escape sequences in C-style quoted strings? -===================================================================== - -A key point when scanning quoted strings is that you cannot (easily) -write a single rule that will precisely match the string if you allow -things like embedded escape sequences and newlines. If you try to -match strings with a single rule then you'll wind up having to rescan -the string anyway to find any escape sequences. - - Instead you can use exclusive start conditions and a set of rules, -one for matching non-escaped text, one for matching a single escape, -one for matching an embedded newline, and one for recognizing the end -of the string. Each of these rules is then faced with the question of -where to put its intermediary results. The best solution is for the -rules to append their local value of `yytext' to the end of a "string -literal" buffer. A rule like the escape-matcher will append to the -buffer the meaning of the escape sequence rather than the literal text -in `yytext'. In this way, `yytext' does not need to be modified at all. - - -File: flex.info, Node: Why do flex scanners call fileno if it is not ANSI compatible?, Next: Does flex support recursive pattern definitions?, Prev: How do I expand backslash-escape sequences in C-style quoted strings?, Up: FAQ - -Why do flex scanners call fileno if it is not ANSI compatible? -============================================================== - -Flex scanners call `fileno()' in order to get the file descriptor -corresponding to `yyin'. The file descriptor may be passed to -`isatty()' or `read()', depending upon which `%options' you specified. -If your system does not have `fileno()' support, to get rid of the -`read()' call, do not specify `%option read'. To get rid of the -`isatty()' call, you must specify one of `%option always-interactive' or -`%option never-interactive'. - - -File: flex.info, Node: Does flex support recursive pattern definitions?, Next: How do I skip huge chunks of input (tens of megabytes) while using flex?, Prev: Why do flex scanners call fileno if it is not ANSI compatible?, Up: FAQ - -Does flex support recursive pattern definitions? -================================================ - -e.g., - - - %% - block "{"({block}|{statement})*"}" - - No. You cannot have recursive definitions. The pattern-matching -power of regular expressions in general (and therefore flex scanners, -too) is limited. In particular, regular expressions cannot "balance" -parentheses to an arbitrary degree. For example, it's impossible to -write a regular expression that matches all strings containing the same -number of '{'s as '}'s. For more powerful pattern matching, you need a -parser, such as `GNU bison'. - - -File: flex.info, Node: How do I skip huge chunks of input (tens of megabytes) while using flex?, Next: Flex is not matching my patterns in the same order that I defined them., Prev: Does flex support recursive pattern definitions?, Up: FAQ - -How do I skip huge chunks of input (tens of megabytes) while using flex? -======================================================================== - -Use `fseek()' (or `lseek()') to position yyin, then call `yyrestart()'. - - -File: flex.info, Node: Flex is not matching my patterns in the same order that I defined them., Next: My actions are executing out of order or sometimes not at all., Prev: How do I skip huge chunks of input (tens of megabytes) while using flex?, Up: FAQ - -Flex is not matching my patterns in the same order that I defined them. -======================================================================= - -`flex' picks the rule that matches the most text (i.e., the longest -possible input string). This is because `flex' uses an entirely -different matching technique ("deterministic finite automata") that -actually does all of the matching simultaneously, in parallel. (Seems -impossible, but it's actually a fairly simple technique once you -understand the principles.) - - A side-effect of this parallel matching is that when the input -matches more than one rule, `flex' scanners pick the rule that matched -the _most_ text. This is explained further in the manual, in the -section *Note Matching::. - - If you want `flex' to choose a shorter match, then you can work -around this behavior by expanding your short rule to match more text, -then put back the extra: - - - data_.* yyless( 5 ); BEGIN BLOCKIDSTATE; - - Another fix would be to make the second rule active only during the -`<BLOCKIDSTATE>' start condition, and make that start condition -exclusive by declaring it with `%x' instead of `%s'. - - A final fix is to change the input language so that the ambiguity for -`data_' is removed, by adding characters to it that don't match the -identifier rule, or by removing characters (such as `_') from the -identifier rule so it no longer matches `data_'. (Of course, you might -also not have the option of changing the input language.) - - -File: flex.info, Node: My actions are executing out of order or sometimes not at all., Next: How can I have multiple input sources feed into the same scanner at the same time?, Prev: Flex is not matching my patterns in the same order that I defined them., Up: FAQ - -My actions are executing out of order or sometimes not at all. -============================================================== - -Most likely, you have (in error) placed the opening `{' of the action -block on a different line than the rule, e.g., - - - ^(foo|bar) - { <<<--- WRONG! - - } - - `flex' requires that the opening `{' of an action associated with a -rule begin on the same line as does the rule. You need instead to -write your rules as follows: - - - ^(foo|bar) { // CORRECT! - - } - - -File: flex.info, Node: How can I have multiple input sources feed into the same scanner at the same time?, Next: Can I build nested parsers that work with the same input file?, Prev: My actions are executing out of order or sometimes not at all., Up: FAQ - -How can I have multiple input sources feed into the same scanner at the same time? -================================================================================== - -If ... - * your scanner is free of backtracking (verified using `flex''s `-b' - flag), - - * AND you run your scanner interactively (`-I' option; default - unless using special table compression options), - - * AND you feed it one character at a time by redefining `YY_INPUT' - to do so, - - then every time it matches a token, it will have exhausted its input -buffer (because the scanner is free of backtracking). This means you -can safely use `select()' at the point and only call `yylex()' for -another token if `select()' indicates there's data available. - - That is, move the `select()' out from the input function to a point -where it determines whether `yylex()' gets called for the next token. - - With this approach, you will still have problems if your input can -arrive piecemeal; `select()' could inform you that the beginning of a -token is available, you call `yylex()' to get it, but it winds up -blocking waiting for the later characters in the token. - - Here's another way: Move your input multiplexing inside of -`YY_INPUT'. That is, whenever `YY_INPUT' is called, it `select()''s to -see where input is available. If input is available for the scanner, -it reads and returns the next byte. If input is available from another -source, it calls whatever function is responsible for reading from that -source. (If no input is available, it blocks until some input is -available.) I've used this technique in an interpreter I wrote that -both reads keyboard input using a `flex' scanner and IPC traffic from -sockets, and it works fine. - - -File: flex.info, Node: Can I build nested parsers that work with the same input file?, Next: How can I match text only at the end of a file?, Prev: How can I have multiple input sources feed into the same scanner at the same time?, Up: FAQ - -Can I build nested parsers that work with the same input file? -============================================================== - -This is not going to work without some additional effort. The reason is -that `flex' block-buffers the input it reads from `yyin'. This means -that the "outermost" `yylex()', when called, will automatically slurp -up the first 8K of input available on yyin, and subsequent calls to -other `yylex()''s won't see that input. You might be tempted to work -around this problem by redefining `YY_INPUT' to only return a small -amount of text, but it turns out that that approach is quite difficult. -Instead, the best solution is to combine all of your scanners into one -large scanner, using a different exclusive start condition for each. - - -File: flex.info, Node: How can I match text only at the end of a file?, Next: How can I make REJECT cascade across start condition boundaries?, Prev: Can I build nested parsers that work with the same input file?, Up: FAQ - -How can I match text only at the end of a file? -=============================================== - -There is no way to write a rule which is "match this text, but only if -it comes at the end of the file". You can fake it, though, if you -happen to have a character lying around that you don't allow in your -input. Then you redefine `YY_INPUT' to call your own routine which, if -it sees an `EOF', returns the magic character first (and remembers to -return a real `EOF' next time it's called). Then you could write: - - - <COMMENT>(.|\n)*{EOF_CHAR} /* saw comment at EOF */ - - -File: flex.info, Node: How can I make REJECT cascade across start condition boundaries?, Next: Why cant I use fast or full tables with interactive mode?, Prev: How can I match text only at the end of a file?, Up: FAQ - -How can I make REJECT cascade across start condition boundaries? -================================================================ - -You can do this as follows. Suppose you have a start condition `A', and -after exhausting all of the possible matches in `<A>', you want to try -matches in `<INITIAL>'. Then you could use the following: - - - %x A - %% - <A>rule_that_is_long ...; REJECT; - <A>rule ...; REJECT; /* shorter rule */ - <A>etc. - ... - <A>.|\n { - /* Shortest and last rule in <A>, so - * cascaded REJECTs will eventually - * wind up matching this rule. We want - * to now switch to the initial state - * and try matching from there instead. - */ - yyless(0); /* put back matched text */ - BEGIN(INITIAL); - } - - -File: flex.info, Node: Why cant I use fast or full tables with interactive mode?, Next: How much faster is -F or -f than -C?, Prev: How can I make REJECT cascade across start condition boundaries?, Up: FAQ - -Why can't I use fast or full tables with interactive mode? -========================================================== - -One of the assumptions flex makes is that interactive applications are -inherently slow (they're waiting on a human after all). It has to do -with how the scanner detects that it must be finished scanning a token. -For interactive scanners, after scanning each character the current -state is looked up in a table (essentially) to see whether there's a -chance of another input character possibly extending the length of the -match. If not, the scanner halts. For non-interactive scanners, the -end-of-token test is much simpler, basically a compare with 0, so no -memory bus cycles. Since the test occurs in the innermost scanning -loop, one would like to make it go as fast as possible. - - Still, it seems reasonable to allow the user to choose to trade off -a bit of performance in this area to gain the corresponding -flexibility. There might be another reason, though, why fast scanners -don't support the interactive option. - - -File: flex.info, Node: How much faster is -F or -f than -C?, Next: If I have a simple grammar cant I just parse it with flex?, Prev: Why cant I use fast or full tables with interactive mode?, Up: FAQ - -How much faster is -F or -f than -C? -==================================== - -Much faster (factor of 2-3). - - -File: flex.info, Node: If I have a simple grammar cant I just parse it with flex?, Next: Why doesn't yyrestart() set the start state back to INITIAL?, Prev: How much faster is -F or -f than -C?, Up: FAQ - -If I have a simple grammar can't I just parse it with flex? -=========================================================== - -Is your grammar recursive? That's almost always a sign that you're -better off using a parser/scanner rather than just trying to use a -scanner alone. - - -File: flex.info, Node: Why doesn't yyrestart() set the start state back to INITIAL?, Next: How can I match C-style comments?, Prev: If I have a simple grammar cant I just parse it with flex?, Up: FAQ - -Why doesn't yyrestart() set the start state back to INITIAL? -============================================================ - -There are two reasons. The first is that there might be programs that -rely on the start state not changing across file changes. The second -is that beginning with `flex' version 2.4, use of `yyrestart()' is no -longer required, so fixing the problem there doesn't solve the more -general problem. - - -File: flex.info, Node: How can I match C-style comments?, Next: The period isn't working the way I expected., Prev: Why doesn't yyrestart() set the start state back to INITIAL?, Up: FAQ - -How can I match C-style comments? -================================= - -You might be tempted to try something like this: - - - "/*".*"*/" // WRONG! - - or, worse, this: - - - "/*"(.|\n)"*/" // WRONG! - - The above rules will eat too much input, and blow up on things like: - - - /* a comment */ do_my_thing( "oops */" ); - - Here is one way which allows you to track line information: - - - <INITIAL>{ - "/*" BEGIN(IN_COMMENT); - } - <IN_COMMENT>{ - "*/" BEGIN(INITIAL); - [^*\n]+ // eat comment in chunks - "*" // eat the lone star - \n yylineno++; - } - - -File: flex.info, Node: The period isn't working the way I expected., Next: Can I get the flex manual in another format?, Prev: How can I match C-style comments?, Up: FAQ - -The '.' isn't working the way I expected. -========================================= - -Here are some tips for using `.': - - * A common mistake is to place the grouping parenthesis AFTER an - operator, when you really meant to place the parenthesis BEFORE - the operator, e.g., you probably want this `(foo|bar)+' and NOT - this `(foo|bar+)'. - - The first pattern matches the words `foo' or `bar' any number of - times, e.g., it matches the text `barfoofoobarfoo'. The second - pattern matches a single instance of `foo' or a single instance of - `bar' followed by one or more `r's, e.g., it matches the text - `barrrr' . - - * A `.' inside `[]''s just means a literal`.' (period), and NOT "any - character except newline". - - * Remember that `.' matches any character EXCEPT `\n' (and `EOF'). - If you really want to match ANY character, including newlines, - then use `(.|\n)' Beware that the regex `(.|\n)+' will match your - entire input! - - * Finally, if you want to match a literal `.' (a period), then use - `[.]' or `"."' - - -File: flex.info, Node: Can I get the flex manual in another format?, Next: Does there exist a "faster" NDFA->DFA algorithm?, Prev: The period isn't working the way I expected., Up: FAQ - -Can I get the flex manual in another format? -============================================ - -The `flex' source distribution includes a texinfo manual. You are free -to convert that texinfo into whatever format you desire. The `texinfo' -package includes tools for conversion to a number of formats. - - -File: flex.info, Node: Does there exist a "faster" NDFA->DFA algorithm?, Next: How does flex compile the DFA so quickly?, Prev: Can I get the flex manual in another format?, Up: FAQ - -Does there exist a "faster" NDFA->DFA algorithm? -================================================ - -There's no way around the potential exponential running time - it can -take you exponential time just to enumerate all of the DFA states. In -practice, though, the running time is closer to linear, or sometimes -quadratic. - - -File: flex.info, Node: How does flex compile the DFA so quickly?, Next: How can I use more than 8192 rules?, Prev: Does there exist a "faster" NDFA->DFA algorithm?, Up: FAQ - -How does flex compile the DFA so quickly? -========================================= - -There are two big speed wins that `flex' uses: - - 1. It analyzes the input rules to construct equivalence classes for - those characters that always make the same transitions. It then - rewrites the NFA using equivalence classes for transitions instead - of characters. This cuts down the NFA->DFA computation time - dramatically, to the point where, for uncompressed DFA tables, the - DFA generation is often I/O bound in writing out the tables. - - 2. It maintains hash values for previously computed DFA states, so - testing whether a newly constructed DFA state is equivalent to a - previously constructed state can be done very quickly, by first - comparing hash values. - - -File: flex.info, Node: How can I use more than 8192 rules?, Next: How do I abandon a file in the middle of a scan and switch to a new file?, Prev: How does flex compile the DFA so quickly?, Up: FAQ - -How can I use more than 8192 rules? -=================================== - -`Flex' is compiled with an upper limit of 8192 rules per scanner. If -you need more than 8192 rules in your scanner, you'll have to recompile -`flex' with the following changes in `flexdef.h': - - - < #define YY_TRAILING_MASK 0x2000 - < #define YY_TRAILING_HEAD_MASK 0x4000 - -- - > #define YY_TRAILING_MASK 0x20000000 - > #define YY_TRAILING_HEAD_MASK 0x40000000 - - This should work okay as long as your C compiler uses 32 bit -integers. But you might want to think about whether using such a huge -number of rules is the best way to solve your problem. - - The following may also be relevant: - - With luck, you should be able to increase the definitions in -flexdef.h for: - - - #define JAMSTATE -32766 /* marks a reference to the state that always jams */ - #define MAXIMUM_MNS 31999 - #define BAD_SUBSCRIPT -32767 - - recompile everything, and it'll all work. Flex only has these -16-bit-like values built into it because a long time ago it was -developed on a machine with 16-bit ints. I've given this advice to -others in the past but haven't heard back from them whether it worked -okay or not... - - -File: flex.info, Node: How do I abandon a file in the middle of a scan and switch to a new file?, Next: How do I execute code only during initialization (only before the first scan)?, Prev: How can I use more than 8192 rules?, Up: FAQ - -How do I abandon a file in the middle of a scan and switch to a new file? -========================================================================= - -Just call `yyrestart(newfile)'. Be sure to reset the start state if you -want a "fresh start, since `yyrestart' does NOT reset the start state -back to `INITIAL'. - - -File: flex.info, Node: How do I execute code only during initialization (only before the first scan)?, Next: How do I execute code at termination?, Prev: How do I abandon a file in the middle of a scan and switch to a new file?, Up: FAQ - -How do I execute code only during initialization (only before the first scan)? -============================================================================== - -You can specify an initial action by defining the macro `YY_USER_INIT' -(though note that `yyout' may not be available at the time this macro -is executed). Or you can add to the beginning of your rules section: - - - %% - /* Must be indented! */ - static int did_init = 0; - - if ( ! did_init ){ - do_my_init(); - did_init = 1; - } - - -File: flex.info, Node: How do I execute code at termination?, Next: Where else can I find help?, Prev: How do I execute code only during initialization (only before the first scan)?, Up: FAQ - -How do I execute code at termination? -===================================== - -You can specify an action for the `<<EOF>>' rule. - - -File: flex.info, Node: Where else can I find help?, Next: Can I include comments in the "rules" section of the file?, Prev: How do I execute code at termination?, Up: FAQ - -Where else can I find help? -=========================== - -You can find the flex homepage on the web at -`http://flex.sourceforge.net/'. See that page for details about flex -mailing lists as well. - - -File: flex.info, Node: Can I include comments in the "rules" section of the file?, Next: I get an error about undefined yywrap()., Prev: Where else can I find help?, Up: FAQ - -Can I include comments in the "rules" section of the file? -========================================================== - -Yes, just about anywhere you want to. See the manual for the specific -syntax. - - -File: flex.info, Node: I get an error about undefined yywrap()., Next: How can I change the matching pattern at run time?, Prev: Can I include comments in the "rules" section of the file?, Up: FAQ - -I get an error about undefined yywrap(). -======================================== - -You must supply a `yywrap()' function of your own, or link to `libfl.a' -(which provides one), or use - - - %option noyywrap - - in your source to say you don't want a `yywrap()' function. - - -File: flex.info, Node: How can I change the matching pattern at run time?, Next: How can I expand macros in the input?, Prev: I get an error about undefined yywrap()., Up: FAQ - -How can I change the matching pattern at run time? -================================================== - -You can't, it's compiled into a static table when flex builds the -scanner. - - -File: flex.info, Node: How can I expand macros in the input?, Next: How can I build a two-pass scanner?, Prev: How can I change the matching pattern at run time?, Up: FAQ - -How can I expand macros in the input? -===================================== - -The best way to approach this problem is at a higher level, e.g., in -the parser. - - However, you can do this using multiple input buffers. - - - %% - macro/[a-z]+ { - /* Saw the macro "macro" followed by extra stuff. */ - main_buffer = YY_CURRENT_BUFFER; - expansion_buffer = yy_scan_string(expand(yytext)); - yy_switch_to_buffer(expansion_buffer); - } - - <<EOF>> { - if ( expansion_buffer ) - { - // We were doing an expansion, return to where - // we were. - yy_switch_to_buffer(main_buffer); - yy_delete_buffer(expansion_buffer); - expansion_buffer = 0; - } - else - yyterminate(); - } - - You probably will want a stack of expansion buffers to allow nested -macros. From the above though hopefully the idea is clear. - - -File: flex.info, Node: How can I build a two-pass scanner?, Next: How do I match any string not matched in the preceding rules?, Prev: How can I expand macros in the input?, Up: FAQ - -How can I build a two-pass scanner? -=================================== - -One way to do it is to filter the first pass to a temporary file, then -process the temporary file on the second pass. You will probably see a -performance hit, due to all the disk I/O. - - When you need to look ahead far forward like this, it almost always -means that the right solution is to build a parse tree of the entire -input, then walk it after the parse in order to generate the output. -In a sense, this is a two-pass approach, once through the text and once -through the parse tree, but the performance hit for the latter is -usually an order of magnitude smaller, since everything is already -classified, in binary format, and residing in memory. - - -File: flex.info, Node: How do I match any string not matched in the preceding rules?, Next: I am trying to port code from AT&T lex that uses yysptr and yysbuf., Prev: How can I build a two-pass scanner?, Up: FAQ - -How do I match any string not matched in the preceding rules? -============================================================= - -One way to assign precedence, is to place the more specific rules -first. If two rules would match the same input (same sequence of -characters) then the first rule listed in the `flex' input wins, e.g., - - - %% - foo[a-zA-Z_]+ return FOO_ID; - bar[a-zA-Z_]+ return BAR_ID; - [a-zA-Z_]+ return GENERIC_ID; - - Note that the rule `[a-zA-Z_]+' must come *after* the others. It -will match the same amount of text as the more specific rules, and in -that case the `flex' scanner will pick the first rule listed in your -scanner as the one to match. - - -File: flex.info, Node: I am trying to port code from AT&T lex that uses yysptr and yysbuf., Next: Is there a way to make flex treat NULL like a regular character?, Prev: How do I match any string not matched in the preceding rules?, Up: FAQ - -I am trying to port code from AT&T lex that uses yysptr and yysbuf. -=================================================================== - -Those are internal variables pointing into the AT&T scanner's input -buffer. I imagine they're being manipulated in user versions of the -`input()' and `unput()' functions. If so, what you need to do is -analyze those functions to figure out what they're doing, and then -replace `input()' with an appropriate definition of `YY_INPUT'. You -shouldn't need to (and must not) replace `flex''s `unput()' function. - - -File: flex.info, Node: Is there a way to make flex treat NULL like a regular character?, Next: Whenever flex can not match the input it says "flex scanner jammed"., Prev: I am trying to port code from AT&T lex that uses yysptr and yysbuf., Up: FAQ - -Is there a way to make flex treat NULL like a regular character? -================================================================ - -Yes, `\0' and `\x00' should both do the trick. Perhaps you have an -ancient version of `flex'. The latest release is version 2.5.35. - - -File: flex.info, Node: Whenever flex can not match the input it says "flex scanner jammed"., Next: Why doesn't flex have non-greedy operators like perl does?, Prev: Is there a way to make flex treat NULL like a regular character?, Up: FAQ - -Whenever flex can not match the input it says "flex scanner jammed". -==================================================================== - -You need to add a rule that matches the otherwise-unmatched text, e.g., - - - %option yylineno - %% - [[a bunch of rules here]] - - . printf("bad input character '%s' at line %d\n", yytext, yylineno); - - See `%option default' for more information. - - -File: flex.info, Node: Why doesn't flex have non-greedy operators like perl does?, Next: Memory leak - 16386 bytes allocated by malloc., Prev: Whenever flex can not match the input it says "flex scanner jammed"., Up: FAQ - -Why doesn't flex have non-greedy operators like perl does? -========================================================== - -A DFA can do a non-greedy match by stopping the first time it enters an -accepting state, instead of consuming input until it determines that no -further matching is possible (a "jam" state). This is actually easier -to implement than longest leftmost match (which flex does). - - But it's also much less useful than longest leftmost match. In -general, when you find yourself wishing for non-greedy matching, that's -usually a sign that you're trying to make the scanner do some parsing. -That's generally the wrong approach, since it lacks the power to do a -decent job. Better is to either introduce a separate parser, or to -split the scanner into multiple scanners using (exclusive) start -conditions. - - You might have a separate start state once you've seen the `BEGIN'. -In that state, you might then have a regex that will match `END' (to -kick you out of the state), and perhaps `(.|\n)' to get a single -character within the chunk ... - - This approach also has much better error-reporting properties. - - -File: flex.info, Node: Memory leak - 16386 bytes allocated by malloc., Next: How do I track the byte offset for lseek()?, Prev: Why doesn't flex have non-greedy operators like perl does?, Up: FAQ - -Memory leak - 16386 bytes allocated by malloc. -============================================== - -UPDATED 2002-07-10: As of `flex' version 2.5.9, this leak means that -you did not call `yylex_destroy()'. If you are using an earlier version -of `flex', then read on. - - The leak is about 16426 bytes. That is, (8192 * 2 + 2) for the -read-buffer, and about 40 for `struct yy_buffer_state' (depending upon -alignment). The leak is in the non-reentrant C scanner only (NOT in the -reentrant scanner, NOT in the C++ scanner). Since `flex' doesn't know -when you are done, the buffer is never freed. - - However, the leak won't multiply since the buffer is reused no -matter how many times you call `yylex()'. - - If you want to reclaim the memory when you are completely done -scanning, then you might try this: - - - /* For non-reentrant C scanner only. */ - yy_delete_buffer(YY_CURRENT_BUFFER); - yy_init = 1; - - Note: `yy_init' is an "internal variable", and hasn't been tested in -this situation. It is possible that some other globals may need -resetting as well. - - -File: flex.info, Node: How do I track the byte offset for lseek()?, Next: How do I use my own I/O classes in a C++ scanner?, Prev: Memory leak - 16386 bytes allocated by malloc., Up: FAQ - -How do I track the byte offset for lseek()? -=========================================== - - - > We thought that it would be possible to have this number through the - > evaluation of the following expression: - > - > seek_position = (no_buffers)*YY_READ_BUF_SIZE + yy_c_buf_p - YY_CURRENT_BUFFER->yy_ch_buf - - While this is the right idea, it has two problems. The first is that -it's possible that `flex' will request less than `YY_READ_BUF_SIZE' -during an invocation of `YY_INPUT' (or that your input source will -return less even though `YY_READ_BUF_SIZE' bytes were requested). The -second problem is that when refilling its internal buffer, `flex' keeps -some characters from the previous buffer (because usually it's in the -middle of a match, and needs those characters to construct `yytext' for -the match once it's done). Because of this, `yy_c_buf_p - -YY_CURRENT_BUFFER->yy_ch_buf' won't be exactly the number of characters -already read from the current buffer. - - An alternative solution is to count the number of characters you've -matched since starting to scan. This can be done by using -`YY_USER_ACTION'. For example, - - - #define YY_USER_ACTION num_chars += yyleng; - - (You need to be careful to update your bookkeeping if you use -`yymore('), `yyless()', `unput()', or `input()'.) - - -File: flex.info, Node: How do I use my own I/O classes in a C++ scanner?, Next: How do I skip as many chars as possible?, Prev: How do I track the byte offset for lseek()?, Up: FAQ - -How do I use my own I/O classes in a C++ scanner? -================================================= - -When the flex C++ scanning class rewrite finally happens, then this -sort of thing should become much easier. - - You can do this by passing the various functions (such as -`LexerInput()' and `LexerOutput()') NULL `iostream*''s, and then -dealing with your own I/O classes surreptitiously (i.e., stashing them -in special member variables). This works because the only assumption -about the lexer regarding what's done with the iostream's is that -they're ultimately passed to `LexerInput()' and `LexerOutput', which -then do whatever is necessary with them. - - -File: flex.info, Node: How do I skip as many chars as possible?, Next: deleteme00, Prev: How do I use my own I/O classes in a C++ scanner?, Up: FAQ - -How do I skip as many chars as possible? -======================================== - -How do I skip as many chars as possible - without interfering with the -other patterns? - - In the example below, we want to skip over characters until we see -the phrase "endskip". The following will _NOT_ work correctly (do you -see why not?) - - - /* INCORRECT SCANNER */ - %x SKIP - %% - <INITIAL>startskip BEGIN(SKIP); - ... - <SKIP>"endskip" BEGIN(INITIAL); - <SKIP>.* ; - - The problem is that the pattern .* will eat up the word "endskip." -The simplest (but slow) fix is: - - - <SKIP>"endskip" BEGIN(INITIAL); - <SKIP>. ; - - The fix involves making the second rule match more, without making -it match "endskip" plus something else. So for example: - - - <SKIP>"endskip" BEGIN(INITIAL); - <SKIP>[^e]+ ; - <SKIP>. ;/* so you eat up e's, too */ - - -File: flex.info, Node: deleteme00, Next: Are certain equivalent patterns faster than others?, Prev: How do I skip as many chars as possible?, Up: FAQ - -deleteme00 -========== - - - QUESTION: - When was flex born? - - Vern Paxson took over - the Software Tools lex project from Jef Poskanzer in 1982. At that point it - was written in Ratfor. Around 1987 or so, Paxson translated it into C, and - a legend was born :-). - - -File: flex.info, Node: Are certain equivalent patterns faster than others?, Next: Is backing up a big deal?, Prev: deleteme00, Up: FAQ - -Are certain equivalent patterns faster than others? -=================================================== - - - To: Adoram Rogel <adoram@orna.hybridge.com> - Subject: Re: Flex 2.5.2 performance questions - In-reply-to: Your message of Wed, 18 Sep 96 11:12:17 EDT. - Date: Wed, 18 Sep 96 10:51:02 PDT - From: Vern Paxson <vern> - - [Note, the most recent flex release is 2.5.4, which you can get from - ftp.ee.lbl.gov. It has bug fixes over 2.5.2 and 2.5.3.] - - > 1. Using the pattern - > ([Ff](oot)?)?[Nn](ote)?(\.)? - > instead of - > (((F|f)oot(N|n)ote)|((N|n)ote)|((N|n)\.)|((F|f)(N|n)(\.))) - > (in a very complicated flex program) caused the program to slow from - > 300K+/min to 100K/min (no other changes were done). - - These two are not equivalent. For example, the first can match "footnote." - but the second can only match "footnote". This is almost certainly the - cause in the discrepancy - the slower scanner run is matching more tokens, - and/or having to do more backing up. - - > 2. Which of these two are better: [Ff]oot or (F|f)oot ? - - From a performance point of view, they're equivalent (modulo presumably - minor effects such as memory cache hit rates; and the presence of trailing - context, see below). From a space point of view, the first is slightly - preferable. - - > 3. I have a pattern that look like this: - > pats {p1}|{p2}|{p3}|...|{p50} (50 patterns ORd) - > - > running yet another complicated program that includes the following rule: - > <snext>{and}/{no4}{bb}{pats} - > - > gets me to "too complicated - over 32,000 states"... - - I can't tell from this example whether the trailing context is variable-length - or fixed-length (it could be the latter if {and} is fixed-length). If it's - variable length, which flex -p will tell you, then this reflects a basic - performance problem, and if you can eliminate it by restructuring your - scanner, you will see significant improvement. - - > so I divided {pats} to {pats1}, {pats2},..., {pats5} each consists of about - > 10 patterns and changed the rule to be 5 rules. - > This did compile, but what is the rule of thumb here ? - - The rule is to avoid trailing context other than fixed-length, in which for - a/b, either the 'a' pattern or the 'b' pattern have a fixed length. Use - of the '|' operator automatically makes the pattern variable length, so in - this case '[Ff]oot' is preferred to '(F|f)oot'. - - > 4. I changed a rule that looked like this: - > <snext8>{and}{bb}/{ROMAN}[^A-Za-z] { BEGIN... - > - > to the next 2 rules: - > <snext8>{and}{bb}/{ROMAN}[A-Za-z] { ECHO;} - > <snext8>{and}{bb}/{ROMAN} { BEGIN... - > - > Again, I understand the using [^...] will cause a great performance loss - - Actually, it doesn't cause any sort of performance loss. It's a surprising - fact about regular expressions that they always match in linear time - regardless of how complex they are. - - > but are there any specific rules about it ? - - See the "Performance Considerations" section of the man page, and also - the example in MISC/fastwc/. - - Vern - - -File: flex.info, Node: Is backing up a big deal?, Next: Can I fake multi-byte character support?, Prev: Are certain equivalent patterns faster than others?, Up: FAQ - -Is backing up a big deal? -========================= - - - To: Adoram Rogel <adoram@hybridge.com> - Subject: Re: Flex 2.5.2 performance questions - In-reply-to: Your message of Thu, 19 Sep 96 10:16:04 EDT. - Date: Thu, 19 Sep 96 09:58:00 PDT - From: Vern Paxson <vern> - - > a lot about the backing up problem. - > I believe that there lies my biggest problem, and I'll try to improve - > it. - - Since you have variable trailing context, this is a bigger performance - problem. Fixing it is usually easier than fixing backing up, which in a - complicated scanner (yours seems to fit the bill) can be extremely - difficult to do correctly. - - You also don't mention what flags you are using for your scanner. - -f makes a large speed difference, and -Cfe buys you nearly as much - speed but the resulting scanner is considerably smaller. - - > I have an | operator in {and} and in {pats} so both of them are variable - > length. - - -p should have reported this. - - > Is changing one of them to fixed-length is enough ? - - Yes. - - > Is it possible to change the 32,000 states limit ? - - Yes. I've appended instructions on how. Before you make this change, - though, you should think about whether there are ways to fundamentally - simplify your scanner - those are certainly preferable! - - Vern - - To increase the 32K limit (on a machine with 32 bit integers), you increase - the magnitude of the following in flexdef.h: - - #define JAMSTATE -32766 /* marks a reference to the state that always jams */ - #define MAXIMUM_MNS 31999 - #define BAD_SUBSCRIPT -32767 - #define MAX_SHORT 32700 - - Adding a 0 or two after each should do the trick. - - -File: flex.info, Node: Can I fake multi-byte character support?, Next: deleteme01, Prev: Is backing up a big deal?, Up: FAQ - -Can I fake multi-byte character support? -======================================== - - - To: Heeman_Lee@hp.com - Subject: Re: flex - multi-byte support? - In-reply-to: Your message of Thu, 03 Oct 1996 17:24:04 PDT. - Date: Fri, 04 Oct 1996 11:42:18 PDT - From: Vern Paxson <vern> - - > I assume as long as my *.l file defines the - > range of expected character code values (in octal format), flex will - > scan the file and read multi-byte characters correctly. But I have no - > confidence in this assumption. - - Your lack of confidence is justified - this won't work. - - Flex has in it a widespread assumption that the input is processed - one byte at a time. Fixing this is on the to-do list, but is involved, - so it won't happen any time soon. In the interim, the best I can suggest - (unless you want to try fixing it yourself) is to write your rules in - terms of pairs of bytes, using definitions in the first section: - - X \xfe\xc2 - ... - %% - foo{X}bar found_foo_fe_c2_bar(); - - etc. Definitely a pain - sorry about that. - - By the way, the email address you used for me is ancient, indicating you - have a very old version of flex. You can get the most recent, 2.5.4, from - ftp.ee.lbl.gov. - - Vern - - -File: flex.info, Node: deleteme01, Next: Can you discuss some flex internals?, Prev: Can I fake multi-byte character support?, Up: FAQ - -deleteme01 -========== - - - To: moleary@primus.com - Subject: Re: Flex / Unicode compatibility question - In-reply-to: Your message of Tue, 22 Oct 1996 10:15:42 PDT. - Date: Tue, 22 Oct 1996 11:06:13 PDT - From: Vern Paxson <vern> - - Unfortunately flex at the moment has a widespread assumption within it - that characters are processed 8 bits at a time. I don't see any easy - fix for this (other than writing your rules in terms of double characters - - a pain). I also don't know of a wider lex, though you might try surfing - the Plan 9 stuff because I know it's a Unicode system, and also the PCCT - toolkit (try searching say Alta Vista for "Purdue Compiler Construction - Toolkit"). - - Fixing flex to handle wider characters is on the long-term to-do list. - But since flex is a strictly spare-time project these days, this probably - won't happen for quite a while, unless someone else does it first. - - Vern - - -File: flex.info, Node: Can you discuss some flex internals?, Next: unput() messes up yy_at_bol, Prev: deleteme01, Up: FAQ - -Can you discuss some flex internals? -==================================== - - - To: Johan Linde <jl@theophys.kth.se> - Subject: Re: translation of flex - In-reply-to: Your message of Sun, 10 Nov 1996 09:16:36 PST. - Date: Mon, 11 Nov 1996 10:33:50 PST - From: Vern Paxson <vern> - - > I'm working for the Swedish team translating GNU program, and I'm currently - > working with flex. I have a few questions about some of the messages which - > I hope you can answer. - - All of the things you're wondering about, by the way, concerning flex - internals - probably the only person who understands what they mean in - English is me! So I wouldn't worry too much about getting them right. - That said ... - - > #: main.c:545 - > msgid " %d protos created\n" - > - > Does proto mean prototype? - - Yes - prototypes of state compression tables. - - > #: main.c:539 - > msgid " %d/%d (peak %d) template nxt-chk entries created\n" - > - > Here I'm mainly puzzled by 'nxt-chk'. I guess it means 'next-check'. (?) - > However, 'template next-check entries' doesn't make much sense to me. To be - > able to find a good translation I need to know a little bit more about it. - - There is a scheme in the Aho/Sethi/Ullman compiler book for compressing - scanner tables. It involves creating two pairs of tables. The first has - "base" and "default" entries, the second has "next" and "check" entries. - The "base" entry is indexed by the current state and yields an index into - the next/check table. The "default" entry gives what to do if the state - transition isn't found in next/check. The "next" entry gives the next - state to enter, but only if the "check" entry verifies that this entry is - correct for the current state. Flex creates templates of series of - next/check entries and then encodes differences from these templates as a - way to compress the tables. - - > #: main.c:533 - > msgid " %d/%d base-def entries created\n" - > - > The same problem here for 'base-def'. - - See above. - - Vern - - -File: flex.info, Node: unput() messes up yy_at_bol, Next: The | operator is not doing what I want, Prev: Can you discuss some flex internals?, Up: FAQ - -unput() messes up yy_at_bol -=========================== - - - To: Xinying Li <xli@npac.syr.edu> - Subject: Re: FLEX ? - In-reply-to: Your message of Wed, 13 Nov 1996 17:28:38 PST. - Date: Wed, 13 Nov 1996 19:51:54 PST - From: Vern Paxson <vern> - - > "unput()" them to input flow, question occurs. If I do this after I scan - > a carriage, the variable "YY_CURRENT_BUFFER->yy_at_bol" is changed. That - > means the carriage flag has gone. - - You can control this by calling yy_set_bol(). It's described in the manual. - - > And if in pre-reading it goes to the end of file, is anything done - > to control the end of curren buffer and end of file? - - No, there's no way to put back an end-of-file. - - > By the way I am using flex 2.5.2 and using the "-l". - - The latest release is 2.5.4, by the way. It fixes some bugs in 2.5.2 and - 2.5.3. You can get it from ftp.ee.lbl.gov. - - Vern - - -File: flex.info, Node: The | operator is not doing what I want, Next: Why can't flex understand this variable trailing context pattern?, Prev: unput() messes up yy_at_bol, Up: FAQ - -The | operator is not doing what I want -======================================= - - - To: Alain.ISSARD@st.com - Subject: Re: Start condition with FLEX - In-reply-to: Your message of Mon, 18 Nov 1996 09:45:02 PST. - Date: Mon, 18 Nov 1996 10:41:34 PST - From: Vern Paxson <vern> - - > I am not able to use the start condition scope and to use the | (OR) with - > rules having start conditions. - - The problem is that if you use '|' as a regular expression operator, for - example "a|b" meaning "match either 'a' or 'b'", then it must *not* have - any blanks around it. If you instead want the special '|' *action* (which - from your scanner appears to be the case), which is a way of giving two - different rules the same action: - - foo | - bar matched_foo_or_bar(); - - then '|' *must* be separated from the first rule by whitespace and *must* - be followed by a new line. You *cannot* write it as: - - foo | bar matched_foo_or_bar(); - - even though you might think you could because yacc supports this syntax. - The reason for this unfortunately incompatibility is historical, but it's - unlikely to be changed. - - Your problems with start condition scope are simply due to syntax errors - from your use of '|' later confusing flex. - - Let me know if you still have problems. - - Vern - - -File: flex.info, Node: Why can't flex understand this variable trailing context pattern?, Next: The ^ operator isn't working, Prev: The | operator is not doing what I want, Up: FAQ - -Why can't flex understand this variable trailing context pattern? -================================================================= - - - To: Gregory Margo <gmargo@newton.vip.best.com> - Subject: Re: flex-2.5.3 bug report - In-reply-to: Your message of Sat, 23 Nov 1996 16:50:09 PST. - Date: Sat, 23 Nov 1996 17:07:32 PST - From: Vern Paxson <vern> - - > Enclosed is a lex file that "real" lex will process, but I cannot get - > flex to process it. Could you try it and maybe point me in the right direction? - - Your problem is that some of the definitions in the scanner use the '/' - trailing context operator, and have it enclosed in ()'s. Flex does not - allow this operator to be enclosed in ()'s because doing so allows undefined - regular expressions such as "(a/b)+". So the solution is to remove the - parentheses. Note that you must also be building the scanner with the -l - option for AT&T lex compatibility. Without this option, flex automatically - encloses the definitions in parentheses. - - Vern - - -File: flex.info, Node: The ^ operator isn't working, Next: Trailing context is getting confused with trailing optional patterns, Prev: Why can't flex understand this variable trailing context pattern?, Up: FAQ - -The ^ operator isn't working -============================ - - - To: Thomas Hadig <hadig@toots.physik.rwth-aachen.de> - Subject: Re: Flex Bug ? - In-reply-to: Your message of Tue, 26 Nov 1996 14:35:01 PST. - Date: Tue, 26 Nov 1996 11:15:05 PST - From: Vern Paxson <vern> - - > In my lexer code, i have the line : - > ^\*.* { } - > - > Thus all lines starting with an astrix (*) are comment lines. - > This does not work ! - - I can't get this problem to reproduce - it works fine for me. Note - though that if what you have is slightly different: - - COMMENT ^\*.* - %% - {COMMENT} { } - - then it won't work, because flex pushes back macro definitions enclosed - in ()'s, so the rule becomes - - (^\*.*) { } - - and now that the '^' operator is not at the immediate beginning of the - line, it's interpreted as just a regular character. You can avoid this - behavior by using the "-l" lex-compatibility flag, or "%option lex-compat". - - Vern - - -File: flex.info, Node: Trailing context is getting confused with trailing optional patterns, Next: Is flex GNU or not?, Prev: The ^ operator isn't working, Up: FAQ - -Trailing context is getting confused with trailing optional patterns -==================================================================== - - - To: Adoram Rogel <adoram@hybridge.com> - Subject: Re: Flex 2.5.4 BOF ??? - In-reply-to: Your message of Tue, 26 Nov 1996 16:10:41 PST. - Date: Wed, 27 Nov 1996 10:56:25 PST - From: Vern Paxson <vern> - - > Organization(s)?/[a-z] - > - > This matched "Organizations" (looking in debug mode, the trailing s - > was matched with trailing context instead of the optional (s) in the - > end of the word. - - That should only happen with lex. Flex can properly match this pattern. - (That might be what you're saying, I'm just not sure.) - - > Is there a way to avoid this dangerous trailing context problem ? - - Unfortunately, there's no easy way. On the other hand, I don't see why - it should be a problem. Lex's matching is clearly wrong, and I'd hope - that usually the intent remains the same as expressed with the pattern, - so flex's matching will be correct. - - Vern - - -File: flex.info, Node: Is flex GNU or not?, Next: ERASEME53, Prev: Trailing context is getting confused with trailing optional patterns, Up: FAQ - -Is flex GNU or not? -=================== - - - To: Cameron MacKinnon <mackin@interlog.com> - Subject: Re: Flex documentation bug - In-reply-to: Your message of Mon, 02 Dec 1996 00:07:08 PST. - Date: Sun, 01 Dec 1996 22:29:39 PST - From: Vern Paxson <vern> - - > I'm not sure how or where to submit bug reports (documentation or - > otherwise) for the GNU project stuff ... - - Well, strictly speaking flex isn't part of the GNU project. They just - distribute it because no one's written a decent GPL'd lex replacement. - So you should send bugs directly to me. Those sent to the GNU folks - sometimes find there way to me, but some may drop between the cracks. - - > In GNU Info, under the section 'Start Conditions', and also in the man - > page (mine's dated April '95) is a nice little snippet showing how to - > parse C quoted strings into a buffer, defined to be MAX_STR_CONST in - > size. Unfortunately, no overflow checking is ever done ... - - This is already mentioned in the manual: - - Finally, here's an example of how to match C-style quoted - strings using exclusive start conditions, including expanded - escape sequences (but not including checking for a string - that's too long): - - The reason for not doing the overflow checking is that it will needlessly - clutter up an example whose main purpose is just to demonstrate how to - use flex. - - The latest release is 2.5.4, by the way, available from ftp.ee.lbl.gov. - - Vern - - -File: flex.info, Node: ERASEME53, Next: I need to scan if-then-else blocks and while loops, Prev: Is flex GNU or not?, Up: FAQ - -ERASEME53 -========= - - - To: tsv@cs.UManitoba.CA - Subject: Re: Flex (reg).. - In-reply-to: Your message of Thu, 06 Mar 1997 23:50:16 PST. - Date: Thu, 06 Mar 1997 15:54:19 PST - From: Vern Paxson <vern> - - > [:alpha:] ([:alnum:] | \\_)* - - If your rule really has embedded blanks as shown above, then it won't - work, as the first blank delimits the rule from the action. (It wouldn't - even compile ...) You need instead: - - [:alpha:]([:alnum:]|\\_)* - - and that should work fine - there's no restriction on what can go inside - of ()'s except for the trailing context operator, '/'. - - Vern - - -File: flex.info, Node: I need to scan if-then-else blocks and while loops, Next: ERASEME55, Prev: ERASEME53, Up: FAQ - -I need to scan if-then-else blocks and while loops -================================================== - - - To: "Mike Stolnicki" <mstolnic@ford.com> - Subject: Re: FLEX help - In-reply-to: Your message of Fri, 30 May 1997 13:33:27 PDT. - Date: Fri, 30 May 1997 10:46:35 PDT - From: Vern Paxson <vern> - - > We'd like to add "if-then-else", "while", and "for" statements to our - > language ... - > We've investigated many possible solutions. The one solution that seems - > the most reasonable involves knowing the position of a TOKEN in yyin. - - I strongly advise you to instead build a parse tree (abstract syntax tree) - and loop over that instead. You'll find this has major benefits in keeping - your interpreter simple and extensible. - - That said, the functionality you mention for get_position and set_position - have been on the to-do list for a while. As flex is a purely spare-time - project for me, no guarantees when this will be added (in particular, it - for sure won't be for many months to come). - - Vern - - -File: flex.info, Node: ERASEME55, Next: ERASEME56, Prev: I need to scan if-then-else blocks and while loops, Up: FAQ - -ERASEME55 -========= - - - To: Colin Paul Adams <colin@colina.demon.co.uk> - Subject: Re: Flex C++ classes and Bison - In-reply-to: Your message of 09 Aug 1997 17:11:41 PDT. - Date: Fri, 15 Aug 1997 10:48:19 PDT - From: Vern Paxson <vern> - - > #define YY_DECL int yylex (YYSTYPE *lvalp, struct parser_control - > *parm) - > - > I have been trying to get this to work as a C++ scanner, but it does - > not appear to be possible (warning that it matches no declarations in - > yyFlexLexer, or something like that). - > - > Is this supposed to be possible, or is it being worked on (I DID - > notice the comment that scanner classes are still experimental, so I'm - > not too hopeful)? - - What you need to do is derive a subclass from yyFlexLexer that provides - the above yylex() method, squirrels away lvalp and parm into member - variables, and then invokes yyFlexLexer::yylex() to do the regular scanning. - - Vern - - -File: flex.info, Node: ERASEME56, Next: ERASEME57, Prev: ERASEME55, Up: FAQ - -ERASEME56 -========= - - - To: Mikael.Latvala@lmf.ericsson.se - Subject: Re: Possible mistake in Flex v2.5 document - In-reply-to: Your message of Fri, 05 Sep 1997 16:07:24 PDT. - Date: Fri, 05 Sep 1997 10:01:54 PDT - From: Vern Paxson <vern> - - > In that example you show how to count comment lines when using - > C style /* ... */ comments. My question is, shouldn't you take into - > account a scenario where end of a comment marker occurs inside - > character or string literals? - - The scanner certainly needs to also scan character and string literals. - However it does that (there's an example in the man page for strings), the - lexer will recognize the beginning of the literal before it runs across the - embedded "/*". Consequently, it will finish scanning the literal before it - even considers the possibility of matching "/*". - - Example: - - '([^']*|{ESCAPE_SEQUENCE})' - - will match all the text between the ''s (inclusive). So the lexer - considers this as a token beginning at the first ', and doesn't even - attempt to match other tokens inside it. - - I thinnk this subtlety is not worth putting in the manual, as I suspect - it would confuse more people than it would enlighten. - - Vern - - -File: flex.info, Node: ERASEME57, Next: Is there a repository for flex scanners?, Prev: ERASEME56, Up: FAQ - -ERASEME57 -========= - - - To: "Marty Leisner" <leisner@sdsp.mc.xerox.com> - Subject: Re: flex limitations - In-reply-to: Your message of Sat, 06 Sep 1997 11:27:21 PDT. - Date: Mon, 08 Sep 1997 11:38:08 PDT - From: Vern Paxson <vern> - - > %% - > [a-zA-Z]+ /* skip a line */ - > { printf("got %s\n", yytext); } - > %% - - What version of flex are you using? If I feed this to 2.5.4, it complains: - - "bug.l", line 5: EOF encountered inside an action - "bug.l", line 5: unrecognized rule - "bug.l", line 5: fatal parse error - - Not the world's greatest error message, but it manages to flag the problem. - - (With the introduction of start condition scopes, flex can't accommodate - an action on a separate line, since it's ambiguous with an indented rule.) - - You can get 2.5.4 from ftp.ee.lbl.gov. - - Vern - - -File: flex.info, Node: Is there a repository for flex scanners?, Next: How can I conditionally compile or preprocess my flex input file?, Prev: ERASEME57, Up: FAQ - -Is there a repository for flex scanners? -======================================== - -Not that we know of. You might try asking on comp.compilers. - - -File: flex.info, Node: How can I conditionally compile or preprocess my flex input file?, Next: Where can I find grammars for lex and yacc?, Prev: Is there a repository for flex scanners?, Up: FAQ - -How can I conditionally compile or preprocess my flex input file? -================================================================= - -Flex doesn't have a preprocessor like C does. You might try using m4, -or the C preprocessor plus a sed script to clean up the result. - - -File: flex.info, Node: Where can I find grammars for lex and yacc?, Next: I get an end-of-buffer message for each character scanned., Prev: How can I conditionally compile or preprocess my flex input file?, Up: FAQ - -Where can I find grammars for lex and yacc? -=========================================== - -In the sources for flex and bison. - - -File: flex.info, Node: I get an end-of-buffer message for each character scanned., Next: unnamed-faq-62, Prev: Where can I find grammars for lex and yacc?, Up: FAQ - -I get an end-of-buffer message for each character scanned. -========================================================== - -This will happen if your LexerInput() function returns only one -character at a time, which can happen either if you're scanner is -"interactive", or if the streams library on your platform always -returns 1 for yyin->gcount(). - - Solution: override LexerInput() with a version that returns whole -buffers. - - -File: flex.info, Node: unnamed-faq-62, Next: unnamed-faq-63, Prev: I get an end-of-buffer message for each character scanned., Up: FAQ - -unnamed-faq-62 -============== - - - To: Georg.Rehm@CL-KI.Uni-Osnabrueck.DE - Subject: Re: Flex maximums - In-reply-to: Your message of Mon, 17 Nov 1997 17:16:06 PST. - Date: Mon, 17 Nov 1997 17:16:15 PST - From: Vern Paxson <vern> - - > I took a quick look into the flex-sources and altered some #defines in - > flexdefs.h: - > - > #define INITIAL_MNS 64000 - > #define MNS_INCREMENT 1024000 - > #define MAXIMUM_MNS 64000 - - The things to fix are to add a couple of zeroes to: - - #define JAMSTATE -32766 /* marks a reference to the state that always jams */ - #define MAXIMUM_MNS 31999 - #define BAD_SUBSCRIPT -32767 - #define MAX_SHORT 32700 - - and, if you get complaints about too many rules, make the following change too: - - #define YY_TRAILING_MASK 0x200000 - #define YY_TRAILING_HEAD_MASK 0x400000 - - - Vern - - -File: flex.info, Node: unnamed-faq-63, Next: unnamed-faq-64, Prev: unnamed-faq-62, Up: FAQ - -unnamed-faq-63 -============== - - - To: jimmey@lexis-nexis.com (Jimmey Todd) - Subject: Re: FLEX question regarding istream vs ifstream - In-reply-to: Your message of Mon, 08 Dec 1997 15:54:15 PST. - Date: Mon, 15 Dec 1997 13:21:35 PST - From: Vern Paxson <vern> - - > stdin_handle = YY_CURRENT_BUFFER; - > ifstream fin( "aFile" ); - > yy_switch_to_buffer( yy_create_buffer( fin, YY_BUF_SIZE ) ); - > - > What I'm wanting to do, is pass the contents of a file thru one set - > of rules and then pass stdin thru another set... It works great if, I - > don't use the C++ classes. But since everything else that I'm doing is - > in C++, I thought I'd be consistent. - > - > The problem is that 'yy_create_buffer' is expecting an istream* as it's - > first argument (as stated in the man page). However, fin is a ifstream - > object. Any ideas on what I might be doing wrong? Any help would be - > appreciated. Thanks!! - - You need to pass &fin, to turn it into an ifstream* instead of an ifstream. - Then its type will be compatible with the expected istream*, because ifstream - is derived from istream. - - Vern - - -File: flex.info, Node: unnamed-faq-64, Next: unnamed-faq-65, Prev: unnamed-faq-63, Up: FAQ - -unnamed-faq-64 -============== - - - To: Enda Fadian <fadiane@piercom.ie> - Subject: Re: Question related to Flex man page? - In-reply-to: Your message of Tue, 16 Dec 1997 15:17:34 PST. - Date: Tue, 16 Dec 1997 14:17:09 PST - From: Vern Paxson <vern> - - > Can you explain to me what is ment by a long-jump in relation to flex? - - Using the longjmp() function while inside yylex() or a routine called by it. - - > what is the flex activation frame. - - Just yylex()'s stack frame. - - > As far as I can see yyrestart will bring me back to the sart of the input - > file and using flex++ isnot really an option! - - No, yyrestart() doesn't imply a rewind, even though its name might sound - like it does. It tells the scanner to flush its internal buffers and - start reading from the given file at its present location. - - Vern - - -File: flex.info, Node: unnamed-faq-65, Next: unnamed-faq-66, Prev: unnamed-faq-64, Up: FAQ - -unnamed-faq-65 -============== - - - To: hassan@larc.info.uqam.ca (Hassan Alaoui) - Subject: Re: Need urgent Help - In-reply-to: Your message of Sat, 20 Dec 1997 19:38:19 PST. - Date: Sun, 21 Dec 1997 21:30:46 PST - From: Vern Paxson <vern> - - > /usr/lib/yaccpar: In function `int yyparse()': - > /usr/lib/yaccpar:184: warning: implicit declaration of function `int yylex(...)' - > - > ld: Undefined symbol - > _yylex - > _yyparse - > _yyin - - This is a known problem with Solaris C++ (and/or Solaris yacc). I believe - the fix is to explicitly insert some 'extern "C"' statements for the - corresponding routines/symbols. - - Vern - - -File: flex.info, Node: unnamed-faq-66, Next: unnamed-faq-67, Prev: unnamed-faq-65, Up: FAQ - -unnamed-faq-66 -============== - - - To: mc0307@mclink.it - Cc: gnu@prep.ai.mit.edu - Subject: Re: [mc0307@mclink.it: Help request] - In-reply-to: Your message of Fri, 12 Dec 1997 17:57:29 PST. - Date: Sun, 21 Dec 1997 22:33:37 PST - From: Vern Paxson <vern> - - > This is my definition for float and integer types: - > . . . - > NZD [1-9] - > ... - > I've tested my program on other lex version (on UNIX Sun Solaris an HP - > UNIX) and it work well, so I think that my definitions are correct. - > There are any differences between Lex and Flex? - - There are indeed differences, as discussed in the man page. The one - you are probably running into is that when flex expands a name definition, - it puts parentheses around the expansion, while lex does not. There's - an example in the man page of how this can lead to different matching. - Flex's behavior complies with the POSIX standard (or at least with the - last POSIX draft I saw). - - Vern - - -File: flex.info, Node: unnamed-faq-67, Next: unnamed-faq-68, Prev: unnamed-faq-66, Up: FAQ - -unnamed-faq-67 -============== - - - To: hassan@larc.info.uqam.ca (Hassan Alaoui) - Subject: Re: Thanks - In-reply-to: Your message of Mon, 22 Dec 1997 16:06:35 PST. - Date: Mon, 22 Dec 1997 14:35:05 PST - From: Vern Paxson <vern> - - > Thank you very much for your help. I compile and link well with C++ while - > declaring 'yylex ...' extern, But a little problem remains. I get a - > segmentation default when executing ( I linked with lfl library) while it - > works well when using LEX instead of flex. Do you have some ideas about the - > reason for this ? - - The one possible reason for this that comes to mind is if you've defined - yytext as "extern char yytext[]" (which is what lex uses) instead of - "extern char *yytext" (which is what flex uses). If it's not that, then - I'm afraid I don't know what the problem might be. - - Vern - - -File: flex.info, Node: unnamed-faq-68, Next: unnamed-faq-69, Prev: unnamed-faq-67, Up: FAQ - -unnamed-faq-68 -============== - - - To: "Bart Niswonger" <NISWONGR@almaden.ibm.com> - Subject: Re: flex 2.5: c++ scanners & start conditions - In-reply-to: Your message of Tue, 06 Jan 1998 10:34:21 PST. - Date: Tue, 06 Jan 1998 19:19:30 PST - From: Vern Paxson <vern> - - > The problem is that when I do this (using %option c++) start - > conditions seem to not apply. - - The BEGIN macro modifies the yy_start variable. For C scanners, this - is a static with scope visible through the whole file. For C++ scanners, - it's a member variable, so it only has visible scope within a member - function. Your lexbegin() routine is not a member function when you - build a C++ scanner, so it's not modifying the correct yy_start. The - diagnostic that indicates this is that you found you needed to add - a declaration of yy_start in order to get your scanner to compile when - using C++; instead, the correct fix is to make lexbegin() a member - function (by deriving from yyFlexLexer). - - Vern - - -File: flex.info, Node: unnamed-faq-69, Next: unnamed-faq-70, Prev: unnamed-faq-68, Up: FAQ - -unnamed-faq-69 -============== - - - To: "Boris Zinin" <boris@ippe.rssi.ru> - Subject: Re: current position in flex buffer - In-reply-to: Your message of Mon, 12 Jan 1998 18:58:23 PST. - Date: Mon, 12 Jan 1998 12:03:15 PST - From: Vern Paxson <vern> - - > The problem is how to determine the current position in flex active - > buffer when a rule is matched.... - - You will need to keep track of this explicitly, such as by redefining - YY_USER_ACTION to count the number of characters matched. - - The latest flex release, by the way, is 2.5.4, available from ftp.ee.lbl.gov. - - Vern - - -File: flex.info, Node: unnamed-faq-70, Next: unnamed-faq-71, Prev: unnamed-faq-69, Up: FAQ - -unnamed-faq-70 -============== - - - To: Bik.Dhaliwal@bis.org - Subject: Re: Flex question - In-reply-to: Your message of Mon, 26 Jan 1998 13:05:35 PST. - Date: Tue, 27 Jan 1998 22:41:52 PST - From: Vern Paxson <vern> - - > That requirement involves knowing - > the character position at which a particular token was matched - > in the lexer. - - The way you have to do this is by explicitly keeping track of where - you are in the file, by counting the number of characters scanned - for each token (available in yyleng). It may prove convenient to - do this by redefining YY_USER_ACTION, as described in the manual. - - Vern - - -File: flex.info, Node: unnamed-faq-71, Next: unnamed-faq-72, Prev: unnamed-faq-70, Up: FAQ - -unnamed-faq-71 -============== - - - To: Vladimir Alexiev <vladimir@cs.ualberta.ca> - Subject: Re: flex: how to control start condition from parser? - In-reply-to: Your message of Mon, 26 Jan 1998 05:50:16 PST. - Date: Tue, 27 Jan 1998 22:45:37 PST - From: Vern Paxson <vern> - - > It seems useful for the parser to be able to tell the lexer about such - > context dependencies, because then they don't have to be limited to - > local or sequential context. - - One way to do this is to have the parser call a stub routine that's - included in the scanner's .l file, and consequently that has access ot - BEGIN. The only ugliness is that the parser can't pass in the state - it wants, because those aren't visible - but if you don't have many - such states, then using a different set of names doesn't seem like - to much of a burden. - - While generating a .h file like you suggests is certainly cleaner, - flex development has come to a virtual stand-still :-(, so a workaround - like the above is much more pragmatic than waiting for a new feature. - - Vern - - -File: flex.info, Node: unnamed-faq-72, Next: unnamed-faq-73, Prev: unnamed-faq-71, Up: FAQ - -unnamed-faq-72 -============== - - - To: Barbara Denny <denny@3com.com> - Subject: Re: freebsd flex bug? - In-reply-to: Your message of Fri, 30 Jan 1998 12:00:43 PST. - Date: Fri, 30 Jan 1998 12:42:32 PST - From: Vern Paxson <vern> - - > lex.yy.c:1996: parse error before `=' - - This is the key, identifying this error. (It may help to pinpoint - it by using flex -L, so it doesn't generate #line directives in its - output.) I will bet you heavy money that you have a start condition - name that is also a variable name, or something like that; flex spits - out #define's for each start condition name, mapping them to a number, - so you can wind up with: - - %x foo - %% - ... - %% - void bar() - { - int foo = 3; - } - - and the penultimate will turn into "int 1 = 3" after C preprocessing, - since flex will put "#define foo 1" in the generated scanner. - - Vern - - -File: flex.info, Node: unnamed-faq-73, Next: unnamed-faq-74, Prev: unnamed-faq-72, Up: FAQ - -unnamed-faq-73 -============== - - - To: Maurice Petrie <mpetrie@infoscigroup.com> - Subject: Re: Lost flex .l file - In-reply-to: Your message of Mon, 02 Feb 1998 14:10:01 PST. - Date: Mon, 02 Feb 1998 11:15:12 PST - From: Vern Paxson <vern> - - > I am curious as to - > whether there is a simple way to backtrack from the generated source to - > reproduce the lost list of tokens we are searching on. - - In theory, it's straight-forward to go from the DFA representation - back to a regular-expression representation - the two are isomorphic. - In practice, a huge headache, because you have to unpack all the tables - back into a single DFA representation, and then write a program to munch - on that and translate it into an RE. - - Sorry for the less-than-happy news ... - - Vern - - -File: flex.info, Node: unnamed-faq-74, Next: unnamed-faq-75, Prev: unnamed-faq-73, Up: FAQ - -unnamed-faq-74 -============== - - - To: jimmey@lexis-nexis.com (Jimmey Todd) - Subject: Re: Flex performance question - In-reply-to: Your message of Thu, 19 Feb 1998 11:01:17 PST. - Date: Thu, 19 Feb 1998 08:48:51 PST - From: Vern Paxson <vern> - - > What I have found, is that the smaller the data chunk, the faster the - > program executes. This is the opposite of what I expected. Should this be - > happening this way? - - This is exactly what will happen if your input file has embedded NULs. - From the man page: - - A final note: flex is slow when matching NUL's, particularly - when a token contains multiple NUL's. It's best to write - rules which match short amounts of text if it's anticipated - that the text will often include NUL's. - - So that's the first thing to look for. - - Vern - - -File: flex.info, Node: unnamed-faq-75, Next: unnamed-faq-76, Prev: unnamed-faq-74, Up: FAQ - -unnamed-faq-75 -============== - - - To: jimmey@lexis-nexis.com (Jimmey Todd) - Subject: Re: Flex performance question - In-reply-to: Your message of Thu, 19 Feb 1998 11:01:17 PST. - Date: Thu, 19 Feb 1998 15:42:25 PST - From: Vern Paxson <vern> - - So there are several problems. - - First, to go fast, you want to match as much text as possible, which - your scanners don't in the case that what they're scanning is *not* - a <RN> tag. So you want a rule like: - - [^<]+ - - Second, C++ scanners are particularly slow if they're interactive, - which they are by default. Using -B speeds it up by a factor of 3-4 - on my workstation. - - Third, C++ scanners that use the istream interface are slow, because - of how poorly implemented istream's are. I built two versions of - the following scanner: - - %% - .*\n - .* - %% - - and the C version inhales a 2.5MB file on my workstation in 0.8 seconds. - The C++ istream version, using -B, takes 3.8 seconds. - - Vern - - -File: flex.info, Node: unnamed-faq-76, Next: unnamed-faq-77, Prev: unnamed-faq-75, Up: FAQ - -unnamed-faq-76 -============== - - - To: "Frescatore, David (CRD, TAD)" <frescatore@exc01crdge.crd.ge.com> - Subject: Re: FLEX 2.5 & THE YEAR 2000 - In-reply-to: Your message of Wed, 03 Jun 1998 11:26:22 PDT. - Date: Wed, 03 Jun 1998 10:22:26 PDT - From: Vern Paxson <vern> - - > I am researching the Y2K problem with General Electric R&D - > and need to know if there are any known issues concerning - > the above mentioned software and Y2K regardless of version. - - There shouldn't be, all it ever does with the date is ask the system - for it and then print it out. - - Vern - - -File: flex.info, Node: unnamed-faq-77, Next: unnamed-faq-78, Prev: unnamed-faq-76, Up: FAQ - -unnamed-faq-77 -============== - - - To: "Hans Dermot Doran" <htd@ibhdoran.com> - Subject: Re: flex problem - In-reply-to: Your message of Wed, 15 Jul 1998 21:30:13 PDT. - Date: Tue, 21 Jul 1998 14:23:34 PDT - From: Vern Paxson <vern> - - > To overcome this, I gets() the stdin into a string and lex the string. The - > string is lexed OK except that the end of string isn't lexed properly - > (yy_scan_string()), that is the lexer dosn't recognise the end of string. - - Flex doesn't contain mechanisms for recognizing buffer endpoints. But if - you use fgets instead (which you should anyway, to protect against buffer - overflows), then the final \n will be preserved in the string, and you can - scan that in order to find the end of the string. - - Vern - - -File: flex.info, Node: unnamed-faq-78, Next: unnamed-faq-79, Prev: unnamed-faq-77, Up: FAQ - -unnamed-faq-78 -============== - - - To: soumen@almaden.ibm.com - Subject: Re: Flex++ 2.5.3 instance member vs. static member - In-reply-to: Your message of Mon, 27 Jul 1998 02:10:04 PDT. - Date: Tue, 28 Jul 1998 01:10:34 PDT - From: Vern Paxson <vern> - - > %{ - > int mylineno = 0; - > %} - > ws [ \t]+ - > alpha [A-Za-z] - > dig [0-9] - > %% - > - > Now you'd expect mylineno to be a member of each instance of class - > yyFlexLexer, but is this the case? A look at the lex.yy.cc file seems to - > indicate otherwise; unless I am missing something the declaration of - > mylineno seems to be outside any class scope. - > - > How will this work if I want to run a multi-threaded application with each - > thread creating a FlexLexer instance? - - Derive your own subclass and make mylineno a member variable of it. - - Vern - - -File: flex.info, Node: unnamed-faq-79, Next: unnamed-faq-80, Prev: unnamed-faq-78, Up: FAQ - -unnamed-faq-79 -============== - - - To: Adoram Rogel <adoram@hybridge.com> - Subject: Re: More than 32K states change hangs - In-reply-to: Your message of Tue, 04 Aug 1998 16:55:39 PDT. - Date: Tue, 04 Aug 1998 22:28:45 PDT - From: Vern Paxson <vern> - - > Vern Paxson, - > - > I followed your advice, posted on Usenet bu you, and emailed to me - > personally by you, on how to overcome the 32K states limit. I'm running - > on Linux machines. - > I took the full source of version 2.5.4 and did the following changes in - > flexdef.h: - > #define JAMSTATE -327660 - > #define MAXIMUM_MNS 319990 - > #define BAD_SUBSCRIPT -327670 - > #define MAX_SHORT 327000 - > - > and compiled. - > All looked fine, including check and bigcheck, so I installed. - - Hmmm, you shouldn't increase MAX_SHORT, though looking through my email - archives I see that I did indeed recommend doing so. Try setting it back - to 32700; that should suffice that you no longer need -Ca. If it still - hangs, then the interesting question is - where? - - > Compiling the same hanged program with a out-of-the-box (RedHat 4.2 - > distribution of Linux) - > flex 2.5.4 binary works. - - Since Linux comes with source code, you should diff it against what - you have to see what problems they missed. - - > Should I always compile with the -Ca option now ? even short and simple - > filters ? - - No, definitely not. It's meant to be for those situations where you - absolutely must squeeze every last cycle out of your scanner. - - Vern - - -File: flex.info, Node: unnamed-faq-80, Next: unnamed-faq-81, Prev: unnamed-faq-79, Up: FAQ - -unnamed-faq-80 -============== - - - To: "Schmackpfeffer, Craig" <Craig.Schmackpfeffer@usa.xerox.com> - Subject: Re: flex output for static code portion - In-reply-to: Your message of Tue, 11 Aug 1998 11:55:30 PDT. - Date: Mon, 17 Aug 1998 23:57:42 PDT - From: Vern Paxson <vern> - - > I would like to use flex under the hood to generate a binary file - > containing the data structures that control the parse. - - This has been on the wish-list for a long time. In principle it's - straight-forward - you redirect mkdata() et al's I/O to another file, - and modify the skeleton to have a start-up function that slurps these - into dynamic arrays. The concerns are (1) the scanner generation code - is hairy and full of corner cases, so it's easy to get surprised when - going down this path :-( ; and (2) being careful about buffering so - that when the tables change you make sure the scanner starts in the - correct state and reading at the right point in the input file. - - > I was wondering if you know of anyone who has used flex in this way. - - I don't - but it seems like a reasonable project to undertake (unlike - numerous other flex tweaks :-). - - Vern - - -File: flex.info, Node: unnamed-faq-81, Next: unnamed-faq-82, Prev: unnamed-faq-80, Up: FAQ - -unnamed-faq-81 -============== - - - Received: from 131.173.17.11 (131.173.17.11 [131.173.17.11]) - by ee.lbl.gov (8.9.1/8.9.1) with ESMTP id AAA03838 - for <vern@ee.lbl.gov>; Thu, 20 Aug 1998 00:47:57 -0700 (PDT) - Received: from hal.cl-ki.uni-osnabrueck.de (hal.cl-ki.Uni-Osnabrueck.DE [131.173.141.2]) - by deimos.rz.uni-osnabrueck.de (8.8.7/8.8.8) with ESMTP id JAA34694 - for <vern@ee.lbl.gov>; Thu, 20 Aug 1998 09:47:55 +0200 - Received: (from georg@localhost) by hal.cl-ki.uni-osnabrueck.de (8.6.12/8.6.12) id JAA34834 for vern@ee.lbl.gov; Thu, 20 Aug 1998 09:47:54 +0200 - From: Georg Rehm <georg@hal.cl-ki.uni-osnabrueck.de> - Message-Id: <199808200747.JAA34834@hal.cl-ki.uni-osnabrueck.de> - Subject: "flex scanner push-back overflow" - To: vern@ee.lbl.gov - Date: Thu, 20 Aug 1998 09:47:54 +0200 (MEST) - Reply-To: Georg.Rehm@CL-KI.Uni-Osnabrueck.DE - X-NoJunk: Do NOT send commercial mail, spam or ads to this address! - X-URL: http://www.cl-ki.uni-osnabrueck.de/~georg/ - X-Mailer: ELM [version 2.4ME+ PL28 (25)] - MIME-Version: 1.0 - Content-Type: text/plain; charset=US-ASCII - Content-Transfer-Encoding: 7bit - - Hi Vern, - - Yesterday, I encountered a strange problem: I use the macro processor m4 - to include some lengthy lists into a .l file. Following is a flex macro - definition that causes some serious pain in my neck: - - AUTHOR ("A. Boucard / L. Boucard"|"A. Dastarac / M. Levent"|"A.Boucaud / L.Boucaud"|"Abderrahim Lamchichi"|"Achmat Dangor"|"Adeline Toullier"|"Adewale Maja-Pearce"|"Ahmed Ziri"|"Akram Ellyas"|"Alain Bihr"|"Alain Gresh"|"Alain Guillemoles"|"Alain Joxe"|"Alain Morice"|"Alain Renon"|"Alain Zecchini"|"Albert Memmi"|"Alberto Manguel"|"Alex De Waal"|"Alfonso Artico"| [...]) - - The complete list contains about 10kB. When I try to "flex" this file - (on a Solaris 2.6 machine, using a modified flex 2.5.4 (I only increased - some of the predefined values in flexdefs.h) I get the error: - - myflex/flex -8 sentag.tmp.l - flex scanner push-back overflow - - When I remove the slashes in the macro definition everything works fine. - As I understand it, the double quotes escape the slash-character so it - really means "/" and not "trailing context". Furthermore, I tried to - escape the slashes with backslashes, but with no use, the same error message - appeared when flexing the code. - - Do you have an idea what's going on here? - - Greetings from Germany, - Georg - -- - Georg Rehm georg@cl-ki.uni-osnabrueck.de - Institute for Semantic Information Processing, University of Osnabrueck, FRG - - -File: flex.info, Node: unnamed-faq-82, Next: unnamed-faq-83, Prev: unnamed-faq-81, Up: FAQ - -unnamed-faq-82 -============== - - - To: Georg.Rehm@CL-KI.Uni-Osnabrueck.DE - Subject: Re: "flex scanner push-back overflow" - In-reply-to: Your message of Thu, 20 Aug 1998 09:47:54 PDT. - Date: Thu, 20 Aug 1998 07:05:35 PDT - From: Vern Paxson <vern> - - > myflex/flex -8 sentag.tmp.l - > flex scanner push-back overflow - - Flex itself uses a flex scanner. That scanner is running out of buffer - space when it tries to unput() the humongous macro you've defined. When - you remove the '/'s, you make it small enough so that it fits in the buffer; - removing spaces would do the same thing. - - The fix is to either rethink how come you're using such a big macro and - perhaps there's another/better way to do it; or to rebuild flex's own - scan.c with a larger value for - - #define YY_BUF_SIZE 16384 - - - Vern - - -File: flex.info, Node: unnamed-faq-83, Next: unnamed-faq-84, Prev: unnamed-faq-82, Up: FAQ - -unnamed-faq-83 -============== - - - To: Jan Kort <jan@research.techforce.nl> - Subject: Re: Flex - In-reply-to: Your message of Fri, 04 Sep 1998 12:18:43 +0200. - Date: Sat, 05 Sep 1998 00:59:49 PDT - From: Vern Paxson <vern> - - > %% - > - > "TEST1\n" { fprintf(stderr, "TEST1\n"); yyless(5); } - > ^\n { fprintf(stderr, "empty line\n"); } - > . { } - > \n { fprintf(stderr, "new line\n"); } - > - > %% - > -- input --------------------------------------- - > TEST1 - > -- output -------------------------------------- - > TEST1 - > empty line - > ------------------------------------------------ - - IMHO, it's not clear whether or not this is in fact a bug. It depends - on whether you view yyless() as backing up in the input stream, or as - pushing new characters onto the beginning of the input stream. Flex - interprets it as the latter (for implementation convenience, I'll admit), - and so considers the newline as in fact matching at the beginning of a - line, as after all the last token scanned an entire line and so the - scanner is now at the beginning of a new line. - - I agree that this is counter-intuitive for yyless(), given its - functional description (it's less so for unput(), depending on whether - you're unput()'ing new text or scanned text). But I don't plan to - change it any time soon, as it's a pain to do so. Consequently, - you do indeed need to use yy_set_bol() and YY_AT_BOL() to tweak - your scanner into the behavior you desire. - - Sorry for the less-than-completely-satisfactory answer. - - Vern - - -File: flex.info, Node: unnamed-faq-84, Next: unnamed-faq-85, Prev: unnamed-faq-83, Up: FAQ - -unnamed-faq-84 -============== - - - To: Patrick Krusenotto <krusenot@mac-info-link.de> - Subject: Re: Problems with restarting flex-2.5.2-generated scanner - In-reply-to: Your message of Thu, 24 Sep 1998 10:14:07 PDT. - Date: Thu, 24 Sep 1998 23:28:43 PDT - From: Vern Paxson <vern> - - > I am using flex-2.5.2 and bison 1.25 for Solaris and I am desperately - > trying to make my scanner restart with a new file after my parser stops - > with a parse error. When my compiler restarts, the parser always - > receives the token after the token (in the old file!) that caused the - > parser error. - - I suspect the problem is that your parser has read ahead in order - to attempt to resolve an ambiguity, and when it's restarted it picks - up with that token rather than reading a fresh one. If you're using - yacc, then the special "error" production can sometimes be used to - consume tokens in an attempt to get the parser into a consistent state. - - Vern - - -File: flex.info, Node: unnamed-faq-85, Next: unnamed-faq-86, Prev: unnamed-faq-84, Up: FAQ - -unnamed-faq-85 -============== - - - To: Henric Jungheim <junghelh@pe-nelson.com> - Subject: Re: flex 2.5.4a - In-reply-to: Your message of Tue, 27 Oct 1998 16:41:42 PST. - Date: Tue, 27 Oct 1998 16:50:14 PST - From: Vern Paxson <vern> - - > This brings up a feature request: How about a command line - > option to specify the filename when reading from stdin? That way one - > doesn't need to create a temporary file in order to get the "#line" - > directives to make sense. - - Use -o combined with -t (per the man page description of -o). - - > P.S., Is there any simple way to use non-blocking IO to parse multiple - > streams? - - Simple, no. - - One approach might be to return a magic character on EWOULDBLOCK and - have a rule - - .*<magic-character> // put back .*, eat magic character - - This is off the top of my head, not sure it'll work. - - Vern - - -File: flex.info, Node: unnamed-faq-86, Next: unnamed-faq-87, Prev: unnamed-faq-85, Up: FAQ - -unnamed-faq-86 -============== - - - To: "Repko, Billy D" <billy.d.repko@intel.com> - Subject: Re: Compiling scanners - In-reply-to: Your message of Wed, 13 Jan 1999 10:52:47 PST. - Date: Thu, 14 Jan 1999 00:25:30 PST - From: Vern Paxson <vern> - - > It appears that maybe it cannot find the lfl library. - - The Makefile in the distribution builds it, so you should have it. - It's exceedingly trivial, just a main() that calls yylex() and - a yyrap() that always returns 1. - - > %% - > \n ++num_lines; ++num_chars; - > . ++num_chars; - - You can't indent your rules like this - that's where the errors are coming - from. Flex copies indented text to the output file, it's how you do things - like - - int num_lines_seen = 0; - - to declare local variables. - - Vern - - -File: flex.info, Node: unnamed-faq-87, Next: unnamed-faq-88, Prev: unnamed-faq-86, Up: FAQ - -unnamed-faq-87 -============== - - - To: Erick Branderhorst <Erick.Branderhorst@asml.nl> - Subject: Re: flex input buffer - In-reply-to: Your message of Tue, 09 Feb 1999 13:53:46 PST. - Date: Tue, 09 Feb 1999 21:03:37 PST - From: Vern Paxson <vern> - - > In the flex.skl file the size of the default input buffers is set. Can you - > explain why this size is set and why it is such a high number. - - It's large to optimize performance when scanning large files. You can - safely make it a lot lower if needed. - - Vern - - -File: flex.info, Node: unnamed-faq-88, Next: unnamed-faq-90, Prev: unnamed-faq-87, Up: FAQ - -unnamed-faq-88 -============== - - - To: "Guido Minnen" <guidomi@cogs.susx.ac.uk> - Subject: Re: Flex error message - In-reply-to: Your message of Wed, 24 Feb 1999 15:31:46 PST. - Date: Thu, 25 Feb 1999 00:11:31 PST - From: Vern Paxson <vern> - - > I'm extending a larger scanner written in Flex and I keep running into - > problems. More specifically, I get the error message: - > "flex: input rules are too complicated (>= 32000 NFA states)" - - Increase the definitions in flexdef.h for: - - #define JAMSTATE -32766 /* marks a reference to the state that always j - ams */ - #define MAXIMUM_MNS 31999 - #define BAD_SUBSCRIPT -32767 - - recompile everything, and it should all work. - - Vern - - -File: flex.info, Node: unnamed-faq-90, Next: unnamed-faq-91, Prev: unnamed-faq-88, Up: FAQ - -unnamed-faq-90 -============== - - - To: "Dmitriy Goldobin" <gold@ems.chel.su> - Subject: Re: FLEX trouble - In-reply-to: Your message of Mon, 31 May 1999 18:44:49 PDT. - Date: Tue, 01 Jun 1999 00:15:07 PDT - From: Vern Paxson <vern> - - > I have a trouble with FLEX. Why rule "/*".*"*/" work properly,=20 - > but rule "/*"(.|\n)*"*/" don't work ? - - The second of these will have to scan the entire input stream (because - "(.|\n)*" matches an arbitrary amount of any text) in order to see if - it ends with "*/", terminating the comment. That potentially will overflow - the input buffer. - - > More complex rule "/*"([^*]|(\*/[^/]))*"*/ give an error - > 'unrecognized rule'. - - You can't use the '/' operator inside parentheses. It's not clear - what "(a/b)*" actually means. - - > I now use workaround with state <comment>, but single-rule is - > better, i think. - - Single-rule is nice but will always have the problem of either setting - restrictions on comments (like not allowing multi-line comments) and/or - running the risk of consuming the entire input stream, as noted above. - - Vern - - -File: flex.info, Node: unnamed-faq-91, Next: unnamed-faq-92, Prev: unnamed-faq-90, Up: FAQ - -unnamed-faq-91 -============== - - - Received: from mc-qout4.whowhere.com (mc-qout4.whowhere.com [209.185.123.18]) - by ee.lbl.gov (8.9.3/8.9.3) with SMTP id IAA05100 - for <vern@ee.lbl.gov>; Tue, 15 Jun 1999 08:56:06 -0700 (PDT) - Received: from Unknown/Local ([?.?.?.?]) by my-deja.com; Tue Jun 15 08:55:43 1999 - To: vern@ee.lbl.gov - Date: Tue, 15 Jun 1999 08:55:43 -0700 - From: "Aki Niimura" <neko@my-deja.com> - Message-ID: <KNONDOHDOBGAEAAA@my-deja.com> - Mime-Version: 1.0 - Cc: - X-Sent-Mail: on - Reply-To: - X-Mailer: MailCity Service - Subject: A question on flex C++ scanner - X-Sender-Ip: 12.72.207.61 - Organization: My Deja Email (http://www.my-deja.com:80) - Content-Type: text/plain; charset=us-ascii - Content-Transfer-Encoding: 7bit - - Dear Dr. Paxon, - - I have been using flex for years. - It works very well on many projects. - Most case, I used it to generate a scanner on C language. - However, one project I needed to generate a scanner - on C++ lanuage. Thanks to your enhancement, flex did - the job. - - Currently, I'm working on enhancing my previous project. - I need to deal with multiple input streams (recursive - inclusion) in this scanner (C++). - I did similar thing for another scanner (C) as you - explained in your documentation. - - The generated scanner (C++) has necessary methods: - - switch_to_buffer(struct yy_buffer_state *b) - - yy_create_buffer(istream *is, int sz) - - yy_delete_buffer(struct yy_buffer_state *b) - - However, I couldn't figure out how to access current - buffer (yy_current_buffer). - - yy_current_buffer is a protected member of yyFlexLexer. - I can't access it directly. - Then, I thought yy_create_buffer() with is = 0 might - return current stream buffer. But it seems not as far - as I checked the source. (flex 2.5.4) - - I went through the Web in addition to Flex documentation. - However, it hasn't been successful, so far. - - It is not my intention to bother you, but, can you - comment about how to obtain the current stream buffer? - - Your response would be highly appreciated. - - Best regards, - Aki Niimura - - --== Sent via Deja.com http://www.deja.com/ ==-- - Share what you know. Learn what you don't. - - -File: flex.info, Node: unnamed-faq-92, Next: unnamed-faq-93, Prev: unnamed-faq-91, Up: FAQ - -unnamed-faq-92 -============== - - - To: neko@my-deja.com - Subject: Re: A question on flex C++ scanner - In-reply-to: Your message of Tue, 15 Jun 1999 08:55:43 PDT. - Date: Tue, 15 Jun 1999 09:04:24 PDT - From: Vern Paxson <vern> - - > However, I couldn't figure out how to access current - > buffer (yy_current_buffer). - - Derive your own subclass from yyFlexLexer. - - Vern - - -File: flex.info, Node: unnamed-faq-93, Next: unnamed-faq-94, Prev: unnamed-faq-92, Up: FAQ - -unnamed-faq-93 -============== - - - To: "Stones, Darren" <Darren.Stones@nectech.co.uk> - Subject: Re: You're the man to see? - In-reply-to: Your message of Wed, 23 Jun 1999 11:10:29 PDT. - Date: Wed, 23 Jun 1999 09:01:40 PDT - From: Vern Paxson <vern> - - > I hope you can help me. I am using Flex and Bison to produce an interpreted - > language. However all goes well until I try to implement an IF statement or - > a WHILE. I cannot get this to work as the parser parses all the conditions - > eg. the TRUE and FALSE conditons to check for a rule match. So I cannot - > make a decision!! - - You need to use the parser to build a parse tree (= abstract syntax trwee), - and when that's all done you recursively evaluate the tree, binding variables - to values at that time. - - Vern - - -File: flex.info, Node: unnamed-faq-94, Next: unnamed-faq-95, Prev: unnamed-faq-93, Up: FAQ - -unnamed-faq-94 -============== - - - To: Petr Danecek <petr@ics.cas.cz> - Subject: Re: flex - question - In-reply-to: Your message of Mon, 28 Jun 1999 19:21:41 PDT. - Date: Fri, 02 Jul 1999 16:52:13 PDT - From: Vern Paxson <vern> - - > file, it takes an enormous amount of time. It is funny, because the - > source code has only 12 rules!!! I think it looks like an exponencial - > growth. - - Right, that's the problem - some patterns (those with a lot of - ambiguity, where yours has because at any given time the scanner can - be in the middle of all sorts of combinations of the different - rules) blow up exponentially. - - For your rules, there is an easy fix. Change the ".*" that comes fater - the directory name to "[^ ]*". With that in place, the rules are no - longer nearly so ambiguous, because then once one of the directories - has been matched, no other can be matched (since they all require a - leading blank). - - If that's not an acceptable solution, then you can enter a start state - to pick up the .*\n after each directory is matched. - - Also note that for speed, you'll want to add a ".*" rule at the end, - otherwise rules that don't match any of the patterns will be matched - very slowly, a character at a time. - - Vern - - -File: flex.info, Node: unnamed-faq-95, Next: unnamed-faq-96, Prev: unnamed-faq-94, Up: FAQ - -unnamed-faq-95 -============== - - - To: Tielman Koekemoer <tielman@spi.co.za> - Subject: Re: Please help. - In-reply-to: Your message of Thu, 08 Jul 1999 13:20:37 PDT. - Date: Thu, 08 Jul 1999 08:20:39 PDT - From: Vern Paxson <vern> - - > I was hoping you could help me with my problem. - > - > I tried compiling (gnu)flex on a Solaris 2.4 machine - > but when I ran make (after configure) I got an error. - > - > -------------------------------------------------------------- - > gcc -c -I. -I. -g -O parse.c - > ./flex -t -p ./scan.l >scan.c - > sh: ./flex: not found - > *** Error code 1 - > make: Fatal error: Command failed for target `scan.c' - > ------------------------------------------------------------- - > - > What's strange to me is that I'm only - > trying to install flex now. I then edited the Makefile to - > and changed where it says "FLEX = flex" to "FLEX = lex" - > ( lex: the native Solaris one ) but then it complains about - > the "-p" option. Is there any way I can compile flex without - > using flex or lex? - > - > Thanks so much for your time. - - You managed to step on the bootstrap sequence, which first copies - initscan.c to scan.c in order to build flex. Try fetching a fresh - distribution from ftp.ee.lbl.gov. (Or you can first try removing - ".bootstrap" and doing a make again.) - - Vern - - -File: flex.info, Node: unnamed-faq-96, Next: unnamed-faq-97, Prev: unnamed-faq-95, Up: FAQ - -unnamed-faq-96 -============== - - - To: Tielman Koekemoer <tielman@spi.co.za> - Subject: Re: Please help. - In-reply-to: Your message of Fri, 09 Jul 1999 09:16:14 PDT. - Date: Fri, 09 Jul 1999 00:27:20 PDT - From: Vern Paxson <vern> - - > First I removed .bootstrap (and ran make) - no luck. I downloaded the - > software but I still have the same problem. Is there anything else I - > could try. - - Try: - - cp initscan.c scan.c - touch scan.c - make scan.o - - If this last tries to first build scan.c from scan.l using ./flex, then - your "make" is broken, in which case compile scan.c to scan.o by hand. - - Vern - - -File: flex.info, Node: unnamed-faq-97, Next: unnamed-faq-98, Prev: unnamed-faq-96, Up: FAQ - -unnamed-faq-97 -============== - - - To: Sumanth Kamenani <skamenan@crl.nmsu.edu> - Subject: Re: Error - In-reply-to: Your message of Mon, 19 Jul 1999 23:08:41 PDT. - Date: Tue, 20 Jul 1999 00:18:26 PDT - From: Vern Paxson <vern> - - > I am getting a compilation error. The error is given as "unknown symbol- yylex". - - The parser relies on calling yylex(), but you're instead using the C++ scanning - class, so you need to supply a yylex() "glue" function that calls an instance - scanner of the scanner (e.g., "scanner->yylex()"). - - Vern - - -File: flex.info, Node: unnamed-faq-98, Next: unnamed-faq-99, Prev: unnamed-faq-97, Up: FAQ - -unnamed-faq-98 -============== - - - To: daniel@synchrods.synchrods.COM (Daniel Senderowicz) - Subject: Re: lex - In-reply-to: Your message of Mon, 22 Nov 1999 11:19:04 PST. - Date: Tue, 23 Nov 1999 15:54:30 PST - From: Vern Paxson <vern> - - Well, your problem is the - - switch (yybgin-yysvec-1) { /* witchcraft */ - - at the beginning of lex rules. "witchcraft" == "non-portable". It's - assuming knowledge of the AT&T lex's internal variables. - - For flex, you can probably do the equivalent using a switch on YYSTATE. - - Vern - - -File: flex.info, Node: unnamed-faq-99, Next: unnamed-faq-100, Prev: unnamed-faq-98, Up: FAQ - -unnamed-faq-99 -============== - - - To: archow@hss.hns.com - Subject: Re: Regarding distribution of flex and yacc based grammars - In-reply-to: Your message of Sun, 19 Dec 1999 17:50:24 +0530. - Date: Wed, 22 Dec 1999 01:56:24 PST - From: Vern Paxson <vern> - - > When we provide the customer with an object code distribution, is it - > necessary for us to provide source - > for the generated C files from flex and bison since they are generated by - > flex and bison ? - - For flex, no. I don't know what the current state of this is for bison. - - > Also, is there any requrirement for us to neccessarily provide source for - > the grammar files which are fed into flex and bison ? - - Again, for flex, no. - - See the file "COPYING" in the flex distribution for the legalese. - - Vern - - -File: flex.info, Node: unnamed-faq-100, Next: unnamed-faq-101, Prev: unnamed-faq-99, Up: FAQ - -unnamed-faq-100 -=============== - - - To: Martin Gallwey <gallweym@hyperion.moe.ul.ie> - Subject: Re: Flex, and self referencing rules - In-reply-to: Your message of Sun, 20 Feb 2000 01:01:21 PST. - Date: Sat, 19 Feb 2000 18:33:16 PST - From: Vern Paxson <vern> - - > However, I do not use unput anywhere. I do use self-referencing - > rules like this: - > - > UnaryExpr ({UnionExpr})|("-"{UnaryExpr}) - - You can't do this - flex is *not* a parser like yacc (which does indeed - allow recursion), it is a scanner that's confined to regular expressions. - - Vern - - -File: flex.info, Node: unnamed-faq-101, Next: What is the difference between YYLEX_PARAM and YY_DECL?, Prev: unnamed-faq-100, Up: FAQ - -unnamed-faq-101 -=============== - - - To: slg3@lehigh.edu (SAMUEL L. GULDEN) - Subject: Re: Flex problem - In-reply-to: Your message of Thu, 02 Mar 2000 12:29:04 PST. - Date: Thu, 02 Mar 2000 23:00:46 PST - From: Vern Paxson <vern> - - If this is exactly your program: - - > digit [0-9] - > digits {digit}+ - > whitespace [ \t\n]+ - > - > %% - > "[" { printf("open_brac\n");} - > "]" { printf("close_brac\n");} - > "+" { printf("addop\n");} - > "*" { printf("multop\n");} - > {digits} { printf("NUMBER = %s\n", yytext);} - > whitespace ; - - then the problem is that the last rule needs to be "{whitespace}" ! - - Vern - - -File: flex.info, Node: What is the difference between YYLEX_PARAM and YY_DECL?, Next: Why do I get "conflicting types for yylex" error?, Prev: unnamed-faq-101, Up: FAQ - -What is the difference between YYLEX_PARAM and YY_DECL? -======================================================= - -YYLEX_PARAM is not a flex symbol. It is for Bison. It tells Bison to -pass extra params when it calls yylex() from the parser. - - YY_DECL is the Flex declaration of yylex. The default is similar to -this: - - - #define int yy_lex () - - -File: flex.info, Node: Why do I get "conflicting types for yylex" error?, Next: How do I access the values set in a Flex action from within a Bison action?, Prev: What is the difference between YYLEX_PARAM and YY_DECL?, Up: FAQ - -Why do I get "conflicting types for yylex" error? -================================================= - -This is a compiler error regarding a generated Bison parser, not a Flex -scanner. It means you need a prototype of yylex() in the top of the -Bison file. Be sure the prototype matches YY_DECL. - - -File: flex.info, Node: How do I access the values set in a Flex action from within a Bison action?, Prev: Why do I get "conflicting types for yylex" error?, Up: FAQ - -How do I access the values set in a Flex action from within a Bison action? -=========================================================================== - -With $1, $2, $3, etc. These are called "Semantic Values" in the Bison -manual. See *Note Top: (bison)Top. - - -File: flex.info, Node: Appendices, Next: Indices, Prev: FAQ, Up: Top - -Appendix A Appendices -********************* - -* Menu: - -* Makefiles and Flex:: -* Bison Bridge:: -* M4 Dependency:: -* Common Patterns:: - - -File: flex.info, Node: Makefiles and Flex, Next: Bison Bridge, Prev: Appendices, Up: Appendices - -A.1 Makefiles and Flex -====================== - -In this appendix, we provide tips for writing Makefiles to build your -scanners. - - In a traditional build environment, we say that the `.c' files are -the sources, and the `.o' files are the intermediate files. When using -`flex', however, the `.l' files are the sources, and the generated `.c' -files (along with the `.o' files) are the intermediate files. This -requires you to carefully plan your Makefile. - - Modern `make' programs understand that `foo.l' is intended to -generate `lex.yy.c' or `foo.c', and will behave accordingly(1)(2). The -following Makefile does not explicitly instruct `make' how to build -`foo.c' from `foo.l'. Instead, it relies on the implicit rules of the -`make' program to build the intermediate file, `scan.c': - - - # Basic Makefile -- relies on implicit rules - # Creates "myprogram" from "scan.l" and "myprogram.c" - # - LEX=flex - myprogram: scan.o myprogram.o - scan.o: scan.l - - For simple cases, the above may be sufficient. For other cases, you -may have to explicitly instruct `make' how to build your scanner. The -following is an example of a Makefile containing explicit rules: - - - # Basic Makefile -- provides explicit rules - # Creates "myprogram" from "scan.l" and "myprogram.c" - # - LEX=flex - myprogram: scan.o myprogram.o - $(CC) -o $@ $(LDFLAGS) $^ - - myprogram.o: myprogram.c - $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $^ - - scan.o: scan.c - $(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $^ - - scan.c: scan.l - $(LEX) $(LFLAGS) -o $@ $^ - - clean: - $(RM) *.o scan.c - - Notice in the above example that `scan.c' is in the `clean' target. -This is because we consider the file `scan.c' to be an intermediate -file. - - Finally, we provide a realistic example of a `flex' scanner used -with a `bison' parser(3). There is a tricky problem we have to deal -with. Since a `flex' scanner will typically include a header file -(e.g., `y.tab.h') generated by the parser, we need to be sure that the -header file is generated BEFORE the scanner is compiled. We handle this -case in the following example: - - - # Makefile example -- scanner and parser. - # Creates "myprogram" from "scan.l", "parse.y", and "myprogram.c" - # - LEX = flex - YACC = bison -y - YFLAGS = -d - objects = scan.o parse.o myprogram.o - - myprogram: $(objects) - scan.o: scan.l parse.c - parse.o: parse.y - myprogram.o: myprogram.c - - In the above example, notice the line, - - - scan.o: scan.l parse.c - - , which lists the file `parse.c' (the generated parser) as a -dependency of `scan.o'. We want to ensure that the parser is created -before the scanner is compiled, and the above line seems to do the -trick. Feel free to experiment with your specific implementation of -`make'. - - For more details on writing Makefiles, see *Note Top: (make)Top. - - ---------- Footnotes ---------- - - (1) GNU `make' and GNU `automake' are two such programs that provide -implicit rules for flex-generated scanners. - - (2) GNU `automake' may generate code to execute flex in -lex-compatible mode, or to stdout. If this is not what you want, then -you should provide an explicit rule in your Makefile.am - - (3) This example also applies to yacc parsers. - - -File: flex.info, Node: Bison Bridge, Next: M4 Dependency, Prev: Makefiles and Flex, Up: Appendices - -A.2 C Scanners with Bison Parsers -================================= - -This section describes the `flex' features useful when integrating -`flex' with `GNU bison'(1). Skip this section if you are not using -`bison' with your scanner. Here we discuss only the `flex' half of the -`flex' and `bison' pair. We do not discuss `bison' in any detail. For -more information about generating `bison' parsers, see *Note Top: -(bison)Top. - - A compatible `bison' scanner is generated by declaring `%option -bison-bridge' or by supplying `--bison-bridge' when invoking `flex' -from the command line. This instructs `flex' that the macro `yylval' -may be used. The data type for `yylval', `YYSTYPE', is typically -defined in a header file, included in section 1 of the `flex' input -file. For a list of functions and macros available, *Note -bison-functions::. - - The declaration of yylex becomes, - - - int yylex ( YYSTYPE * lvalp, yyscan_t scanner ); - - If `%option bison-locations' is specified, then the declaration -becomes, - - - int yylex ( YYSTYPE * lvalp, YYLTYPE * llocp, yyscan_t scanner ); - - Note that the macros `yylval' and `yylloc' evaluate to pointers. -Support for `yylloc' is optional in `bison', so it is optional in -`flex' as well. The following is an example of a `flex' scanner that is -compatible with `bison'. - - - /* Scanner for "C" assignment statements... sort of. */ - %{ - #include "y.tab.h" /* Generated by bison. */ - %} - - %option bison-bridge bison-locations - % - - [[:digit:]]+ { yylval->num = atoi(yytext); return NUMBER;} - [[:alnum:]]+ { yylval->str = strdup(yytext); return STRING;} - "="|";" { return yytext[0];} - . {} - % - - As you can see, there really is no magic here. We just use `yylval' -as we would any other variable. The data type of `yylval' is generated -by `bison', and included in the file `y.tab.h'. Here is the -corresponding `bison' parser: - - - /* Parser to convert "C" assignments to lisp. */ - %{ - /* Pass the argument to yyparse through to yylex. */ - #define YYPARSE_PARAM scanner - #define YYLEX_PARAM scanner - %} - %locations - %pure_parser - %union { - int num; - char* str; - } - %token <str> STRING - %token <num> NUMBER - %% - assignment: - STRING '=' NUMBER ';' { - printf( "(setf %s %d)", $1, $3 ); - } - ; - - ---------- Footnotes ---------- - - (1) The features described here are purely optional, and are by no -means the only way to use flex with bison. We merely provide some glue -to ease development of your parser-scanner pair. - - -File: flex.info, Node: M4 Dependency, Next: Common Patterns, Prev: Bison Bridge, Up: Appendices - -A.3 M4 Dependency -================= - -The macro processor `m4'(1) must be installed wherever flex is -installed. `flex' invokes `m4', found by searching the directories in -the `PATH' environment variable. Any code you place in section 1 or in -the actions will be sent through m4. Please follow these rules to -protect your code from unwanted `m4' processing. - - * Do not use symbols that begin with, `m4_', such as, `m4_define', - or `m4_include', since those are reserved for `m4' macro names. If - for some reason you need m4_ as a prefix, use a preprocessor - #define to get your symbol past m4 unmangled. - - * Do not use the strings `[[' or `]]' anywhere in your code. The - former is not valid in C, except within comments and strings, but - the latter is valid in code such as `x[y[z]]'. The solution is - simple. To get the literal string `"]]"', use `"]""]"'. To get the - array notation `x[y[z]]', use `x[y[z] ]'. Flex will attempt to - detect these sequences in user code, and escape them. However, - it's best to avoid this complexity where possible, by removing - such sequences from your code. - - - `m4' is only required at the time you run `flex'. The generated -scanner is ordinary C or C++, and does _not_ require `m4'. - - ---------- Footnotes ---------- - - (1) The use of m4 is subject to change in future revisions of flex. -It is not part of the public API of flex. Do not depend on it. - - -File: flex.info, Node: Common Patterns, Prev: M4 Dependency, Up: Appendices - -A.4 Common Patterns -=================== - -This appendix provides examples of common regular expressions you might -use in your scanner. - -* Menu: - -* Numbers:: -* Identifiers:: -* Quoted Constructs:: -* Addresses:: - - -File: flex.info, Node: Numbers, Next: Identifiers, Up: Common Patterns - -A.4.1 Numbers -------------- - -C99 decimal constant - `([[:digit:]]{-}[0])[[:digit:]]*' - -C99 hexadecimal constant - `0[xX][[:xdigit:]]+' - -C99 octal constant - `0[0123456]*' - -C99 floating point constant - - {dseq} ([[:digit:]]+) - {dseq_opt} ([[:digit:]]*) - {frac} (({dseq_opt}"."{dseq})|{dseq}".") - {exp} ([eE][+-]?{dseq}) - {exp_opt} ({exp}?) - {fsuff} [flFL] - {fsuff_opt} ({fsuff}?) - {hpref} (0[xX]) - {hdseq} ([[:xdigit:]]+) - {hdseq_opt} ([[:xdigit:]]*) - {hfrac} (({hdseq_opt}"."{hdseq})|({hdseq}".")) - {bexp} ([pP][+-]?{dseq}) - {dfc} (({frac}{exp_opt}{fsuff_opt})|({dseq}{exp}{fsuff_opt})) - {hfc} (({hpref}{hfrac}{bexp}{fsuff_opt})|({hpref}{hdseq}{bexp}{fsuff_opt})) - - {c99_floating_point_constant} ({dfc}|{hfc}) - - See C99 section 6.4.4.2 for the gory details. - - - -File: flex.info, Node: Identifiers, Next: Quoted Constructs, Prev: Numbers, Up: Common Patterns - -A.4.2 Identifiers ------------------ - -C99 Identifier - - ucn ((\\u([[:xdigit:]]{4}))|(\\U([[:xdigit:]]{8}))) - nondigit [_[:alpha:]] - c99_id ([_[:alpha:]]|{ucn})([_[:alnum:]]|{ucn})* - - Technically, the above pattern does not encompass all possible C99 - identifiers, since C99 allows for "implementation-defined" - characters. In practice, C compilers follow the above pattern, - with the addition of the `$' character. - -UTF-8 Encoded Unicode Code Point - - [\x09\x0A\x0D\x20-\x7E]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF]([\x80-\xBF]{2})|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF]([\x80-\xBF]{2})|[\xF1-\xF3]([\x80-\xBF]{3})|\xF4[\x80-\x8F]([\x80-\xBF]{2}) - - - -File: flex.info, Node: Quoted Constructs, Next: Addresses, Prev: Identifiers, Up: Common Patterns - -A.4.3 Quoted Constructs ------------------------ - -C99 String Literal - `L?\"([^\"\\\n]|(\\['\"?\\abfnrtv])|(\\([0123456]{1,3}))|(\\x[[:xdigit:]]+)|(\\u([[:xdigit:]]{4}))|(\\U([[:xdigit:]]{8})))*\"' - -C99 Comment - `("/*"([^*]|"*"[^/])*"*/")|("/"(\\\n)*"/"[^\n]*)' - - Note that in C99, a `//'-style comment may be split across lines, - and, contrary to popular belief, does not include the trailing - `\n' character. - - A better way to scan `/* */' comments is by line, rather than - matching possibly huge comments all at once. This will allow you - to scan comments of unlimited length, as long as line breaks - appear at sane intervals. This is also more efficient when used - with automatic line number processing. *Note option-yylineno::. - - - <INITIAL>{ - "/*" BEGIN(COMMENT); - } - <COMMENT>{ - "*/" BEGIN(0); - [^*\n]+ ; - "*"[^/] ; - \n ; - } - - - -File: flex.info, Node: Addresses, Prev: Quoted Constructs, Up: Common Patterns - -A.4.4 Addresses ---------------- - -IPv4 Address - `(([[:digit:]]{1,3}"."){3}([[:digit:]]{1,3}))' - -IPv6 Address - - hex4 ([[:xdigit:]]{1,4}) - hexseq ({hex4}(:{hex4}*)) - hexpart ({hexseq}|({hexseq}::({hexseq}?))|::{hexseq}) - IPv6address ({hexpart}(":"{IPv4address})?) - - See RFC2373 for details. - -URI - `(([^:/?#]+):)?("//"([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?' - - This pattern is nearly useless, since it allows just about any - character to appear in a URI, including spaces and control - characters. See RFC2396 for details. - - - -File: flex.info, Node: Indices, Prev: Appendices, Up: Top - -Indices -******* - -* Menu: - -* Concept Index:: -* Index of Functions and Macros:: -* Index of Variables:: -* Index of Data Types:: -* Index of Hooks:: -* Index of Scanner Options:: - diff --git a/doc/flex.info-2 b/doc/flex.info-2 Binary files differdeleted file mode 100644 index 27cffbd..0000000 --- a/doc/flex.info-2 +++ /dev/null diff --git a/doc/flex.pdf b/doc/flex.pdf Binary files differdeleted file mode 100644 index 3ba009f..0000000 --- a/doc/flex.pdf +++ /dev/null diff --git a/doc/mdate-sh b/doc/mdate-sh deleted file mode 100755 index cd916c0..0000000 --- a/doc/mdate-sh +++ /dev/null @@ -1,201 +0,0 @@ -#!/bin/sh -# Get modification time of a file or directory and pretty-print it. - -scriptversion=2005-06-29.22 - -# Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005 Free Software -# Foundation, Inc. -# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995 -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2, or (at your option) -# any later version. -# -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software Foundation, -# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - -# As a special exception to the GNU General Public License, if you -# distribute this file as part of a program that contains a -# configuration script generated by Autoconf, you may include it under -# the same distribution terms that you use for the rest of that program. - -# This file is maintained in Automake, please report -# bugs to <bug-automake@gnu.org> or send patches to -# <automake-patches@gnu.org>. - -case $1 in - '') - echo "$0: No file. Try \`$0 --help' for more information." 1>&2 - exit 1; - ;; - -h | --h*) - cat <<\EOF -Usage: mdate-sh [--help] [--version] FILE - -Pretty-print the modification time of FILE. - -Report bugs to <bug-automake@gnu.org>. -EOF - exit $? - ;; - -v | --v*) - echo "mdate-sh $scriptversion" - exit $? - ;; -esac - -# Prevent date giving response in another language. -LANG=C -export LANG -LC_ALL=C -export LC_ALL -LC_TIME=C -export LC_TIME - -# GNU ls changes its time format in response to the TIME_STYLE -# variable. Since we cannot assume `unset' works, revert this -# variable to its documented default. -if test "${TIME_STYLE+set}" = set; then - TIME_STYLE=posix-long-iso - export TIME_STYLE -fi - -save_arg1=$1 - -# Find out how to get the extended ls output of a file or directory. -if ls -L /dev/null 1>/dev/null 2>&1; then - ls_command='ls -L -l -d' -else - ls_command='ls -l -d' -fi - -# A `ls -l' line looks as follows on OS/2. -# drwxrwx--- 0 Aug 11 2001 foo -# This differs from Unix, which adds ownership information. -# drwxrwx--- 2 root root 4096 Aug 11 2001 foo -# -# To find the date, we split the line on spaces and iterate on words -# until we find a month. This cannot work with files whose owner is a -# user named `Jan', or `Feb', etc. However, it's unlikely that `/' -# will be owned by a user whose name is a month. So we first look at -# the extended ls output of the root directory to decide how many -# words should be skipped to get the date. - -# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below. -set x`ls -l -d /` - -# Find which argument is the month. -month= -command= -until test $month -do - shift - # Add another shift to the command. - command="$command shift;" - case $1 in - Jan) month=January; nummonth=1;; - Feb) month=February; nummonth=2;; - Mar) month=March; nummonth=3;; - Apr) month=April; nummonth=4;; - May) month=May; nummonth=5;; - Jun) month=June; nummonth=6;; - Jul) month=July; nummonth=7;; - Aug) month=August; nummonth=8;; - Sep) month=September; nummonth=9;; - Oct) month=October; nummonth=10;; - Nov) month=November; nummonth=11;; - Dec) month=December; nummonth=12;; - esac -done - -# Get the extended ls output of the file or directory. -set dummy x`eval "$ls_command \"\$save_arg1\""` - -# Remove all preceding arguments -eval $command - -# Because of the dummy argument above, month is in $2. -# -# On a POSIX system, we should have -# -# $# = 5 -# $1 = file size -# $2 = month -# $3 = day -# $4 = year or time -# $5 = filename -# -# On Darwin 7.7.0 and 7.6.0, we have -# -# $# = 4 -# $1 = day -# $2 = month -# $3 = year or time -# $4 = filename - -# Get the month. -case $2 in - Jan) month=January; nummonth=1;; - Feb) month=February; nummonth=2;; - Mar) month=March; nummonth=3;; - Apr) month=April; nummonth=4;; - May) month=May; nummonth=5;; - Jun) month=June; nummonth=6;; - Jul) month=July; nummonth=7;; - Aug) month=August; nummonth=8;; - Sep) month=September; nummonth=9;; - Oct) month=October; nummonth=10;; - Nov) month=November; nummonth=11;; - Dec) month=December; nummonth=12;; -esac - -case $3 in - ???*) day=$1;; - *) day=$3; shift;; -esac - -# Here we have to deal with the problem that the ls output gives either -# the time of day or the year. -case $3 in - *:*) set `date`; eval year=\$$# - case $2 in - Jan) nummonthtod=1;; - Feb) nummonthtod=2;; - Mar) nummonthtod=3;; - Apr) nummonthtod=4;; - May) nummonthtod=5;; - Jun) nummonthtod=6;; - Jul) nummonthtod=7;; - Aug) nummonthtod=8;; - Sep) nummonthtod=9;; - Oct) nummonthtod=10;; - Nov) nummonthtod=11;; - Dec) nummonthtod=12;; - esac - # For the first six month of the year the time notation can also - # be used for files modified in the last year. - if (expr $nummonth \> $nummonthtod) > /dev/null; - then - year=`expr $year - 1` - fi;; - *) year=$3;; -esac - -# The result. -echo $day $month $year - -# Local Variables: -# mode: shell-script -# sh-indentation: 2 -# eval: (add-hook 'write-file-hooks 'time-stamp) -# time-stamp-start: "scriptversion=" -# time-stamp-format: "%:y-%02m-%02d.%02H" -# time-stamp-end: "$" -# End: diff --git a/doc/stamp-vti b/doc/stamp-vti deleted file mode 100644 index 46b5982..0000000 --- a/doc/stamp-vti +++ /dev/null @@ -1,4 +0,0 @@ -@set UPDATED 10 September 2007 -@set UPDATED-MONTH September 2007 -@set EDITION 2.5.35 -@set VERSION 2.5.35 diff --git a/doc/texinfo.tex b/doc/texinfo.tex deleted file mode 100644 index ff2c406..0000000 --- a/doc/texinfo.tex +++ /dev/null @@ -1,7210 +0,0 @@ -% texinfo.tex -- TeX macros to handle Texinfo files. -% -% Load plain if necessary, i.e., if running under initex. -\expandafter\ifx\csname fmtname\endcsname\relax\input plain\fi -% -\def\texinfoversion{2005-07-05.19} -% -% Copyright (C) 1985, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995, -% 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software -% Foundation, Inc. -% -% This texinfo.tex file is free software; you can redistribute it and/or -% modify it under the terms of the GNU General Public License as -% published by the Free Software Foundation; either version 2, or (at -% your option) any later version. -% -% This texinfo.tex file is distributed in the hope that it will be -% useful, but WITHOUT ANY WARRANTY; without even the implied warranty -% of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -% General Public License for more details. -% -% You should have received a copy of the GNU General Public License -% along with this texinfo.tex file; see the file COPYING. If not, write -% to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, -% Boston, MA 02110-1301, USA. -% -% As a special exception, when this file is read by TeX when processing -% a Texinfo source document, you may use the result without -% restriction. (This has been our intent since Texinfo was invented.) -% -% Please try the latest version of texinfo.tex before submitting bug -% reports; you can get the latest version from: -% http://www.gnu.org/software/texinfo/ (the Texinfo home page), or -% ftp://tug.org/tex/texinfo.tex -% (and all CTAN mirrors, see http://www.ctan.org). -% The texinfo.tex in any given distribution could well be out -% of date, so if that's what you're using, please check. -% -% Send bug reports to bug-texinfo@gnu.org. Please include including a -% complete document in each bug report with which we can reproduce the -% problem. Patches are, of course, greatly appreciated. -% -% To process a Texinfo manual with TeX, it's most reliable to use the -% texi2dvi shell script that comes with the distribution. For a simple -% manual foo.texi, however, you can get away with this: -% tex foo.texi -% texindex foo.?? -% tex foo.texi -% tex foo.texi -% dvips foo.dvi -o # or whatever; this makes foo.ps. -% The extra TeX runs get the cross-reference information correct. -% Sometimes one run after texindex suffices, and sometimes you need more -% than two; texi2dvi does it as many times as necessary. -% -% It is possible to adapt texinfo.tex for other languages, to some -% extent. You can get the existing language-specific files from the -% full Texinfo distribution. -% -% The GNU Texinfo home page is http://www.gnu.org/software/texinfo. - - -\message{Loading texinfo [version \texinfoversion]:} - -% If in a .fmt file, print the version number -% and turn on active characters that we couldn't do earlier because -% they might have appeared in the input file name. -\everyjob{\message{[Texinfo version \texinfoversion]}% - \catcode`+=\active \catcode`\_=\active} - -\message{Basics,} -\chardef\other=12 - -% We never want plain's \outer definition of \+ in Texinfo. -% For @tex, we can use \tabalign. -\let\+ = \relax - -% Save some plain tex macros whose names we will redefine. -\let\ptexb=\b -\let\ptexbullet=\bullet -\let\ptexc=\c -\let\ptexcomma=\, -\let\ptexdot=\. -\let\ptexdots=\dots -\let\ptexend=\end -\let\ptexequiv=\equiv -\let\ptexexclam=\! -\let\ptexfootnote=\footnote -\let\ptexgtr=> -\let\ptexhat=^ -\let\ptexi=\i -\let\ptexindent=\indent -\let\ptexinsert=\insert -\let\ptexlbrace=\{ -\let\ptexless=< -\let\ptexnewwrite\newwrite -\let\ptexnoindent=\noindent -\let\ptexplus=+ -\let\ptexrbrace=\} -\let\ptexslash=\/ -\let\ptexstar=\* -\let\ptext=\t - -% If this character appears in an error message or help string, it -% starts a new line in the output. -\newlinechar = `^^J - -% Use TeX 3.0's \inputlineno to get the line number, for better error -% messages, but if we're using an old version of TeX, don't do anything. -% -\ifx\inputlineno\thisisundefined - \let\linenumber = \empty % Pre-3.0. -\else - \def\linenumber{l.\the\inputlineno:\space} -\fi - -% Set up fixed words for English if not already set. -\ifx\putwordAppendix\undefined \gdef\putwordAppendix{Appendix}\fi -\ifx\putwordChapter\undefined \gdef\putwordChapter{Chapter}\fi -\ifx\putwordfile\undefined \gdef\putwordfile{file}\fi -\ifx\putwordin\undefined \gdef\putwordin{in}\fi -\ifx\putwordIndexIsEmpty\undefined \gdef\putwordIndexIsEmpty{(Index is empty)}\fi -\ifx\putwordIndexNonexistent\undefined \gdef\putwordIndexNonexistent{(Index is nonexistent)}\fi -\ifx\putwordInfo\undefined \gdef\putwordInfo{Info}\fi -\ifx\putwordInstanceVariableof\undefined \gdef\putwordInstanceVariableof{Instance Variable of}\fi -\ifx\putwordMethodon\undefined \gdef\putwordMethodon{Method on}\fi -\ifx\putwordNoTitle\undefined \gdef\putwordNoTitle{No Title}\fi -\ifx\putwordof\undefined \gdef\putwordof{of}\fi -\ifx\putwordon\undefined \gdef\putwordon{on}\fi -\ifx\putwordpage\undefined \gdef\putwordpage{page}\fi -\ifx\putwordsection\undefined \gdef\putwordsection{section}\fi -\ifx\putwordSection\undefined \gdef\putwordSection{Section}\fi -\ifx\putwordsee\undefined \gdef\putwordsee{see}\fi -\ifx\putwordSee\undefined \gdef\putwordSee{See}\fi -\ifx\putwordShortTOC\undefined \gdef\putwordShortTOC{Short Contents}\fi -\ifx\putwordTOC\undefined \gdef\putwordTOC{Table of Contents}\fi -% -\ifx\putwordMJan\undefined \gdef\putwordMJan{January}\fi -\ifx\putwordMFeb\undefined \gdef\putwordMFeb{February}\fi -\ifx\putwordMMar\undefined \gdef\putwordMMar{March}\fi -\ifx\putwordMApr\undefined \gdef\putwordMApr{April}\fi -\ifx\putwordMMay\undefined \gdef\putwordMMay{May}\fi -\ifx\putwordMJun\undefined \gdef\putwordMJun{June}\fi -\ifx\putwordMJul\undefined \gdef\putwordMJul{July}\fi -\ifx\putwordMAug\undefined \gdef\putwordMAug{August}\fi -\ifx\putwordMSep\undefined \gdef\putwordMSep{September}\fi -\ifx\putwordMOct\undefined \gdef\putwordMOct{October}\fi -\ifx\putwordMNov\undefined \gdef\putwordMNov{November}\fi -\ifx\putwordMDec\undefined \gdef\putwordMDec{December}\fi -% -\ifx\putwordDefmac\undefined \gdef\putwordDefmac{Macro}\fi -\ifx\putwordDefspec\undefined \gdef\putwordDefspec{Special Form}\fi -\ifx\putwordDefvar\undefined \gdef\putwordDefvar{Variable}\fi -\ifx\putwordDefopt\undefined \gdef\putwordDefopt{User Option}\fi -\ifx\putwordDeffunc\undefined \gdef\putwordDeffunc{Function}\fi - -% In some macros, we cannot use the `\? notation---the left quote is -% in some cases the escape char. -\chardef\backChar = `\\ -\chardef\colonChar = `\: -\chardef\commaChar = `\, -\chardef\dotChar = `\. -\chardef\exclamChar= `\! -\chardef\plusChar = `\+ -\chardef\questChar = `\? -\chardef\semiChar = `\; -\chardef\underChar = `\_ - -\chardef\spaceChar = `\ % -\chardef\spacecat = 10 -\def\spaceisspace{\catcode\spaceChar=\spacecat} - -{% for help with debugging. - % example usage: \expandafter\show\activebackslash - \catcode`\! = 0 \catcode`\\ = \active - !global!def!activebackslash{\} -} - -% Ignore a token. -% -\def\gobble#1{} - -% The following is used inside several \edef's. -\def\makecsname#1{\expandafter\noexpand\csname#1\endcsname} - -% Hyphenation fixes. -\hyphenation{ - Flor-i-da Ghost-script Ghost-view Mac-OS Post-Script - ap-pen-dix bit-map bit-maps - data-base data-bases eshell fall-ing half-way long-est man-u-script - man-u-scripts mini-buf-fer mini-buf-fers over-view par-a-digm - par-a-digms rath-er rec-tan-gu-lar ro-bot-ics se-vere-ly set-up spa-ces - spell-ing spell-ings - stand-alone strong-est time-stamp time-stamps which-ever white-space - wide-spread wrap-around -} - -% Margin to add to right of even pages, to left of odd pages. -\newdimen\bindingoffset -\newdimen\normaloffset -\newdimen\pagewidth \newdimen\pageheight - -% For a final copy, take out the rectangles -% that mark overfull boxes (in case you have decided -% that the text looks ok even though it passes the margin). -% -\def\finalout{\overfullrule=0pt} - -% @| inserts a changebar to the left of the current line. It should -% surround any changed text. This approach does *not* work if the -% change spans more than two lines of output. To handle that, we would -% have adopt a much more difficult approach (putting marks into the main -% vertical list for the beginning and end of each change). -% -\def\|{% - % \vadjust can only be used in horizontal mode. - \leavevmode - % - % Append this vertical mode material after the current line in the output. - \vadjust{% - % We want to insert a rule with the height and depth of the current - % leading; that is exactly what \strutbox is supposed to record. - \vskip-\baselineskip - % - % \vadjust-items are inserted at the left edge of the type. So - % the \llap here moves out into the left-hand margin. - \llap{% - % - % For a thicker or thinner bar, change the `1pt'. - \vrule height\baselineskip width1pt - % - % This is the space between the bar and the text. - \hskip 12pt - }% - }% -} - -% Sometimes it is convenient to have everything in the transcript file -% and nothing on the terminal. We don't just call \tracingall here, -% since that produces some useless output on the terminal. We also make -% some effort to order the tracing commands to reduce output in the log -% file; cf. trace.sty in LaTeX. -% -\def\gloggingall{\begingroup \globaldefs = 1 \loggingall \endgroup}% -\def\loggingall{% - \tracingstats2 - \tracingpages1 - \tracinglostchars2 % 2 gives us more in etex - \tracingparagraphs1 - \tracingoutput1 - \tracingmacros2 - \tracingrestores1 - \showboxbreadth\maxdimen \showboxdepth\maxdimen - \ifx\eTeXversion\undefined\else % etex gives us more logging - \tracingscantokens1 - \tracingifs1 - \tracinggroups1 - \tracingnesting2 - \tracingassigns1 - \fi - \tracingcommands3 % 3 gives us more in etex - \errorcontextlines16 -}% - -% add check for \lastpenalty to plain's definitions. If the last thing -% we did was a \nobreak, we don't want to insert more space. -% -\def\smallbreak{\ifnum\lastpenalty<10000\par\ifdim\lastskip<\smallskipamount - \removelastskip\penalty-50\smallskip\fi\fi} -\def\medbreak{\ifnum\lastpenalty<10000\par\ifdim\lastskip<\medskipamount - \removelastskip\penalty-100\medskip\fi\fi} -\def\bigbreak{\ifnum\lastpenalty<10000\par\ifdim\lastskip<\bigskipamount - \removelastskip\penalty-200\bigskip\fi\fi} - -% For @cropmarks command. -% Do @cropmarks to get crop marks. -% -\newif\ifcropmarks -\let\cropmarks = \cropmarkstrue -% -% Dimensions to add cropmarks at corners. -% Added by P. A. MacKay, 12 Nov. 1986 -% -\newdimen\outerhsize \newdimen\outervsize % set by the paper size routines -\newdimen\cornerlong \cornerlong=1pc -\newdimen\cornerthick \cornerthick=.3pt -\newdimen\topandbottommargin \topandbottommargin=.75in - -% Main output routine. -\chardef\PAGE = 255 -\output = {\onepageout{\pagecontents\PAGE}} - -\newbox\headlinebox -\newbox\footlinebox - -% \onepageout takes a vbox as an argument. Note that \pagecontents -% does insertions, but you have to call it yourself. -\def\onepageout#1{% - \ifcropmarks \hoffset=0pt \else \hoffset=\normaloffset \fi - % - \ifodd\pageno \advance\hoffset by \bindingoffset - \else \advance\hoffset by -\bindingoffset\fi - % - % Do this outside of the \shipout so @code etc. will be expanded in - % the headline as they should be, not taken literally (outputting ''code). - \setbox\headlinebox = \vbox{\let\hsize=\pagewidth \makeheadline}% - \setbox\footlinebox = \vbox{\let\hsize=\pagewidth \makefootline}% - % - {% - % Have to do this stuff outside the \shipout because we want it to - % take effect in \write's, yet the group defined by the \vbox ends - % before the \shipout runs. - % - \indexdummies % don't expand commands in the output. - \shipout\vbox{% - % Do this early so pdf references go to the beginning of the page. - \ifpdfmakepagedest \pdfdest name{\the\pageno} xyz\fi - % - \ifcropmarks \vbox to \outervsize\bgroup - \hsize = \outerhsize - \vskip-\topandbottommargin - \vtop to0pt{% - \line{\ewtop\hfil\ewtop}% - \nointerlineskip - \line{% - \vbox{\moveleft\cornerthick\nstop}% - \hfill - \vbox{\moveright\cornerthick\nstop}% - }% - \vss}% - \vskip\topandbottommargin - \line\bgroup - \hfil % center the page within the outer (page) hsize. - \ifodd\pageno\hskip\bindingoffset\fi - \vbox\bgroup - \fi - % - \unvbox\headlinebox - \pagebody{#1}% - \ifdim\ht\footlinebox > 0pt - % Only leave this space if the footline is nonempty. - % (We lessened \vsize for it in \oddfootingxxx.) - % The \baselineskip=24pt in plain's \makefootline has no effect. - \vskip 2\baselineskip - \unvbox\footlinebox - \fi - % - \ifcropmarks - \egroup % end of \vbox\bgroup - \hfil\egroup % end of (centering) \line\bgroup - \vskip\topandbottommargin plus1fill minus1fill - \boxmaxdepth = \cornerthick - \vbox to0pt{\vss - \line{% - \vbox{\moveleft\cornerthick\nsbot}% - \hfill - \vbox{\moveright\cornerthick\nsbot}% - }% - \nointerlineskip - \line{\ewbot\hfil\ewbot}% - }% - \egroup % \vbox from first cropmarks clause - \fi - }% end of \shipout\vbox - }% end of group with \indexdummies - \advancepageno - \ifnum\outputpenalty>-20000 \else\dosupereject\fi -} - -\newinsert\margin \dimen\margin=\maxdimen - -\def\pagebody#1{\vbox to\pageheight{\boxmaxdepth=\maxdepth #1}} -{\catcode`\@ =11 -\gdef\pagecontents#1{\ifvoid\topins\else\unvbox\topins\fi -% marginal hacks, juha@viisa.uucp (Juha Takala) -\ifvoid\margin\else % marginal info is present - \rlap{\kern\hsize\vbox to\z@{\kern1pt\box\margin \vss}}\fi -\dimen@=\dp#1 \unvbox#1 -\ifvoid\footins\else\vskip\skip\footins\footnoterule \unvbox\footins\fi -\ifr@ggedbottom \kern-\dimen@ \vfil \fi} -} - -% Here are the rules for the cropmarks. Note that they are -% offset so that the space between them is truly \outerhsize or \outervsize -% (P. A. MacKay, 12 November, 1986) -% -\def\ewtop{\vrule height\cornerthick depth0pt width\cornerlong} -\def\nstop{\vbox - {\hrule height\cornerthick depth\cornerlong width\cornerthick}} -\def\ewbot{\vrule height0pt depth\cornerthick width\cornerlong} -\def\nsbot{\vbox - {\hrule height\cornerlong depth\cornerthick width\cornerthick}} - -% Parse an argument, then pass it to #1. The argument is the rest of -% the input line (except we remove a trailing comment). #1 should be a -% macro which expects an ordinary undelimited TeX argument. -% -\def\parsearg{\parseargusing{}} -\def\parseargusing#1#2{% - \def\next{#2}% - \begingroup - \obeylines - \spaceisspace - #1% - \parseargline\empty% Insert the \empty token, see \finishparsearg below. -} - -{\obeylines % - \gdef\parseargline#1^^M{% - \endgroup % End of the group started in \parsearg. - \argremovecomment #1\comment\ArgTerm% - }% -} - -% First remove any @comment, then any @c comment. -\def\argremovecomment#1\comment#2\ArgTerm{\argremovec #1\c\ArgTerm} -\def\argremovec#1\c#2\ArgTerm{\argcheckspaces#1\^^M\ArgTerm} - -% Each occurence of `\^^M' or `<space>\^^M' is replaced by a single space. -% -% \argremovec might leave us with trailing space, e.g., -% @end itemize @c foo -% This space token undergoes the same procedure and is eventually removed -% by \finishparsearg. -% -\def\argcheckspaces#1\^^M{\argcheckspacesX#1\^^M \^^M} -\def\argcheckspacesX#1 \^^M{\argcheckspacesY#1\^^M} -\def\argcheckspacesY#1\^^M#2\^^M#3\ArgTerm{% - \def\temp{#3}% - \ifx\temp\empty - % We cannot use \next here, as it holds the macro to run; - % thus we reuse \temp. - \let\temp\finishparsearg - \else - \let\temp\argcheckspaces - \fi - % Put the space token in: - \temp#1 #3\ArgTerm -} - -% If a _delimited_ argument is enclosed in braces, they get stripped; so -% to get _exactly_ the rest of the line, we had to prevent such situation. -% We prepended an \empty token at the very beginning and we expand it now, -% just before passing the control to \next. -% (Similarily, we have to think about #3 of \argcheckspacesY above: it is -% either the null string, or it ends with \^^M---thus there is no danger -% that a pair of braces would be stripped. -% -% But first, we have to remove the trailing space token. -% -\def\finishparsearg#1 \ArgTerm{\expandafter\next\expandafter{#1}} - -% \parseargdef\foo{...} -% is roughly equivalent to -% \def\foo{\parsearg\Xfoo} -% \def\Xfoo#1{...} -% -% Actually, I use \csname\string\foo\endcsname, ie. \\foo, as it is my -% favourite TeX trick. --kasal, 16nov03 - -\def\parseargdef#1{% - \expandafter \doparseargdef \csname\string#1\endcsname #1% -} -\def\doparseargdef#1#2{% - \def#2{\parsearg#1}% - \def#1##1% -} - -% Several utility definitions with active space: -{ - \obeyspaces - \gdef\obeyedspace{ } - - % Make each space character in the input produce a normal interword - % space in the output. Don't allow a line break at this space, as this - % is used only in environments like @example, where each line of input - % should produce a line of output anyway. - % - \gdef\sepspaces{\obeyspaces\let =\tie} - - % If an index command is used in an @example environment, any spaces - % therein should become regular spaces in the raw index file, not the - % expansion of \tie (\leavevmode \penalty \@M \ ). - \gdef\unsepspaces{\let =\space} -} - - -\def\flushcr{\ifx\par\lisppar \def\next##1{}\else \let\next=\relax \fi \next} - -% Define the framework for environments in texinfo.tex. It's used like this: -% -% \envdef\foo{...} -% \def\Efoo{...} -% -% It's the responsibility of \envdef to insert \begingroup before the -% actual body; @end closes the group after calling \Efoo. \envdef also -% defines \thisenv, so the current environment is known; @end checks -% whether the environment name matches. The \checkenv macro can also be -% used to check whether the current environment is the one expected. -% -% Non-false conditionals (@iftex, @ifset) don't fit into this, so they -% are not treated as enviroments; they don't open a group. (The -% implementation of @end takes care not to call \endgroup in this -% special case.) - - -% At runtime, environments start with this: -\def\startenvironment#1{\begingroup\def\thisenv{#1}} -% initialize -\let\thisenv\empty - -% ... but they get defined via ``\envdef\foo{...}'': -\long\def\envdef#1#2{\def#1{\startenvironment#1#2}} -\def\envparseargdef#1#2{\parseargdef#1{\startenvironment#1#2}} - -% Check whether we're in the right environment: -\def\checkenv#1{% - \def\temp{#1}% - \ifx\thisenv\temp - \else - \badenverr - \fi -} - -% Evironment mismatch, #1 expected: -\def\badenverr{% - \errhelp = \EMsimple - \errmessage{This command can appear only \inenvironment\temp, - not \inenvironment\thisenv}% -} -\def\inenvironment#1{% - \ifx#1\empty - out of any environment% - \else - in environment \expandafter\string#1% - \fi -} - -% @end foo executes the definition of \Efoo. -% But first, it executes a specialized version of \checkenv -% -\parseargdef\end{% - \if 1\csname iscond.#1\endcsname - \else - % The general wording of \badenverr may not be ideal, but... --kasal, 06nov03 - \expandafter\checkenv\csname#1\endcsname - \csname E#1\endcsname - \endgroup - \fi -} - -\newhelp\EMsimple{Press RETURN to continue.} - - -%% Simple single-character @ commands - -% @@ prints an @ -% Kludge this until the fonts are right (grr). -\def\@{{\tt\char64}} - -% This is turned off because it was never documented -% and you can use @w{...} around a quote to suppress ligatures. -%% Define @` and @' to be the same as ` and ' -%% but suppressing ligatures. -%\def\`{{`}} -%\def\'{{'}} - -% Used to generate quoted braces. -\def\mylbrace {{\tt\char123}} -\def\myrbrace {{\tt\char125}} -\let\{=\mylbrace -\let\}=\myrbrace -\begingroup - % Definitions to produce \{ and \} commands for indices, - % and @{ and @} for the aux/toc files. - \catcode`\{ = \other \catcode`\} = \other - \catcode`\[ = 1 \catcode`\] = 2 - \catcode`\! = 0 \catcode`\\ = \other - !gdef!lbracecmd[\{]% - !gdef!rbracecmd[\}]% - !gdef!lbraceatcmd[@{]% - !gdef!rbraceatcmd[@}]% -!endgroup - -% @comma{} to avoid , parsing problems. -\let\comma = , - -% Accents: @, @dotaccent @ringaccent @ubaraccent @udotaccent -% Others are defined by plain TeX: @` @' @" @^ @~ @= @u @v @H. -\let\, = \c -\let\dotaccent = \. -\def\ringaccent#1{{\accent23 #1}} -\let\tieaccent = \t -\let\ubaraccent = \b -\let\udotaccent = \d - -% Other special characters: @questiondown @exclamdown @ordf @ordm -% Plain TeX defines: @AA @AE @O @OE @L (plus lowercase versions) @ss. -\def\questiondown{?`} -\def\exclamdown{!`} -\def\ordf{\leavevmode\raise1ex\hbox{\selectfonts\lllsize \underbar{a}}} -\def\ordm{\leavevmode\raise1ex\hbox{\selectfonts\lllsize \underbar{o}}} - -% Dotless i and dotless j, used for accents. -\def\imacro{i} -\def\jmacro{j} -\def\dotless#1{% - \def\temp{#1}% - \ifx\temp\imacro \ptexi - \else\ifx\temp\jmacro \j - \else \errmessage{@dotless can be used only with i or j}% - \fi\fi -} - -% The \TeX{} logo, as in plain, but resetting the spacing so that a -% period following counts as ending a sentence. (Idea found in latex.) -% -\edef\TeX{\TeX \spacefactor=1000 } - -% @LaTeX{} logo. Not quite the same results as the definition in -% latex.ltx, since we use a different font for the raised A; it's most -% convenient for us to use an explicitly smaller font, rather than using -% the \scriptstyle font (since we don't reset \scriptstyle and -% \scriptscriptstyle). -% -\def\LaTeX{% - L\kern-.36em - {\setbox0=\hbox{T}% - \vbox to \ht0{\hbox{\selectfonts\lllsize A}\vss}}% - \kern-.15em - \TeX -} - -% Be sure we're in horizontal mode when doing a tie, since we make space -% equivalent to this in @example-like environments. Otherwise, a space -% at the beginning of a line will start with \penalty -- and -% since \penalty is valid in vertical mode, we'd end up putting the -% penalty on the vertical list instead of in the new paragraph. -{\catcode`@ = 11 - % Avoid using \@M directly, because that causes trouble - % if the definition is written into an index file. - \global\let\tiepenalty = \@M - \gdef\tie{\leavevmode\penalty\tiepenalty\ } -} - -% @: forces normal size whitespace following. -\def\:{\spacefactor=1000 } - -% @* forces a line break. -\def\*{\hfil\break\hbox{}\ignorespaces} - -% @/ allows a line break. -\let\/=\allowbreak - -% @. is an end-of-sentence period. -\def\.{.\spacefactor=\endofsentencespacefactor\space} - -% @! is an end-of-sentence bang. -\def\!{!\spacefactor=\endofsentencespacefactor\space} - -% @? is an end-of-sentence query. -\def\?{?\spacefactor=\endofsentencespacefactor\space} - -% @frenchspacing on|off says whether to put extra space after punctuation. -% -\def\onword{on} -\def\offword{off} -% -\parseargdef\frenchspacing{% - \def\temp{#1}% - \ifx\temp\onword \plainfrenchspacing - \else\ifx\temp\offword \plainnonfrenchspacing - \else - \errhelp = \EMsimple - \errmessage{Unknown @frenchspacing option `\temp', must be on/off}% - \fi\fi -} - -% @w prevents a word break. Without the \leavevmode, @w at the -% beginning of a paragraph, when TeX is still in vertical mode, would -% produce a whole line of output instead of starting the paragraph. -\def\w#1{\leavevmode\hbox{#1}} - -% @group ... @end group forces ... to be all on one page, by enclosing -% it in a TeX vbox. We use \vtop instead of \vbox to construct the box -% to keep its height that of a normal line. According to the rules for -% \topskip (p.114 of the TeXbook), the glue inserted is -% max (\topskip - \ht (first item), 0). If that height is large, -% therefore, no glue is inserted, and the space between the headline and -% the text is small, which looks bad. -% -% Another complication is that the group might be very large. This can -% cause the glue on the previous page to be unduly stretched, because it -% does not have much material. In this case, it's better to add an -% explicit \vfill so that the extra space is at the bottom. The -% threshold for doing this is if the group is more than \vfilllimit -% percent of a page (\vfilllimit can be changed inside of @tex). -% -\newbox\groupbox -\def\vfilllimit{0.7} -% -\envdef\group{% - \ifnum\catcode`\^^M=\active \else - \errhelp = \groupinvalidhelp - \errmessage{@group invalid in context where filling is enabled}% - \fi - \startsavinginserts - % - \setbox\groupbox = \vtop\bgroup - % Do @comment since we are called inside an environment such as - % @example, where each end-of-line in the input causes an - % end-of-line in the output. We don't want the end-of-line after - % the `@group' to put extra space in the output. Since @group - % should appear on a line by itself (according to the Texinfo - % manual), we don't worry about eating any user text. - \comment -} -% -% The \vtop produces a box with normal height and large depth; thus, TeX puts -% \baselineskip glue before it, and (when the next line of text is done) -% \lineskip glue after it. Thus, space below is not quite equal to space -% above. But it's pretty close. -\def\Egroup{% - % To get correct interline space between the last line of the group - % and the first line afterwards, we have to propagate \prevdepth. - \endgraf % Not \par, as it may have been set to \lisppar. - \global\dimen1 = \prevdepth - \egroup % End the \vtop. - % \dimen0 is the vertical size of the group's box. - \dimen0 = \ht\groupbox \advance\dimen0 by \dp\groupbox - % \dimen2 is how much space is left on the page (more or less). - \dimen2 = \pageheight \advance\dimen2 by -\pagetotal - % if the group doesn't fit on the current page, and it's a big big - % group, force a page break. - \ifdim \dimen0 > \dimen2 - \ifdim \pagetotal < \vfilllimit\pageheight - \page - \fi - \fi - \box\groupbox - \prevdepth = \dimen1 - \checkinserts -} -% -% TeX puts in an \escapechar (i.e., `@') at the beginning of the help -% message, so this ends up printing `@group can only ...'. -% -\newhelp\groupinvalidhelp{% -group can only be used in environments such as @example,^^J% -where each line of input produces a line of output.} - -% @need space-in-mils -% forces a page break if there is not space-in-mils remaining. - -\newdimen\mil \mil=0.001in - -% Old definition--didn't work. -%\parseargdef\need{\par % -%% This method tries to make TeX break the page naturally -%% if the depth of the box does not fit. -%{\baselineskip=0pt% -%\vtop to #1\mil{\vfil}\kern -#1\mil\nobreak -%\prevdepth=-1000pt -%}} - -\parseargdef\need{% - % Ensure vertical mode, so we don't make a big box in the middle of a - % paragraph. - \par - % - % If the @need value is less than one line space, it's useless. - \dimen0 = #1\mil - \dimen2 = \ht\strutbox - \advance\dimen2 by \dp\strutbox - \ifdim\dimen0 > \dimen2 - % - % Do a \strut just to make the height of this box be normal, so the - % normal leading is inserted relative to the preceding line. - % And a page break here is fine. - \vtop to #1\mil{\strut\vfil}% - % - % TeX does not even consider page breaks if a penalty added to the - % main vertical list is 10000 or more. But in order to see if the - % empty box we just added fits on the page, we must make it consider - % page breaks. On the other hand, we don't want to actually break the - % page after the empty box. So we use a penalty of 9999. - % - % There is an extremely small chance that TeX will actually break the - % page at this \penalty, if there are no other feasible breakpoints in - % sight. (If the user is using lots of big @group commands, which - % almost-but-not-quite fill up a page, TeX will have a hard time doing - % good page breaking, for example.) However, I could not construct an - % example where a page broke at this \penalty; if it happens in a real - % document, then we can reconsider our strategy. - \penalty9999 - % - % Back up by the size of the box, whether we did a page break or not. - \kern -#1\mil - % - % Do not allow a page break right after this kern. - \nobreak - \fi -} - -% @br forces paragraph break (and is undocumented). - -\let\br = \par - -% @page forces the start of a new page. -% -\def\page{\par\vfill\supereject} - -% @exdent text.... -% outputs text on separate line in roman font, starting at standard page margin - -% This records the amount of indent in the innermost environment. -% That's how much \exdent should take out. -\newskip\exdentamount - -% This defn is used inside fill environments such as @defun. -\parseargdef\exdent{\hfil\break\hbox{\kern -\exdentamount{\rm#1}}\hfil\break} - -% This defn is used inside nofill environments such as @example. -\parseargdef\nofillexdent{{\advance \leftskip by -\exdentamount - \leftline{\hskip\leftskip{\rm#1}}}} - -% @inmargin{WHICH}{TEXT} puts TEXT in the WHICH margin next to the current -% paragraph. For more general purposes, use the \margin insertion -% class. WHICH is `l' or `r'. -% -\newskip\inmarginspacing \inmarginspacing=1cm -\def\strutdepth{\dp\strutbox} -% -\def\doinmargin#1#2{\strut\vadjust{% - \nobreak - \kern-\strutdepth - \vtop to \strutdepth{% - \baselineskip=\strutdepth - \vss - % if you have multiple lines of stuff to put here, you'll need to - % make the vbox yourself of the appropriate size. - \ifx#1l% - \llap{\ignorespaces #2\hskip\inmarginspacing}% - \else - \rlap{\hskip\hsize \hskip\inmarginspacing \ignorespaces #2}% - \fi - \null - }% -}} -\def\inleftmargin{\doinmargin l} -\def\inrightmargin{\doinmargin r} -% -% @inmargin{TEXT [, RIGHT-TEXT]} -% (if RIGHT-TEXT is given, use TEXT for left page, RIGHT-TEXT for right; -% else use TEXT for both). -% -\def\inmargin#1{\parseinmargin #1,,\finish} -\def\parseinmargin#1,#2,#3\finish{% not perfect, but better than nothing. - \setbox0 = \hbox{\ignorespaces #2}% - \ifdim\wd0 > 0pt - \def\lefttext{#1}% have both texts - \def\righttext{#2}% - \else - \def\lefttext{#1}% have only one text - \def\righttext{#1}% - \fi - % - \ifodd\pageno - \def\temp{\inrightmargin\righttext}% odd page -> outside is right margin - \else - \def\temp{\inleftmargin\lefttext}% - \fi - \temp -} - -% @include file insert text of that file as input. -% -\def\include{\parseargusing\filenamecatcodes\includezzz} -\def\includezzz#1{% - \pushthisfilestack - \def\thisfile{#1}% - {% - \makevalueexpandable - \def\temp{\input #1 }% - \expandafter - }\temp - \popthisfilestack -} -\def\filenamecatcodes{% - \catcode`\\=\other - \catcode`~=\other - \catcode`^=\other - \catcode`_=\other - \catcode`|=\other - \catcode`<=\other - \catcode`>=\other - \catcode`+=\other - \catcode`-=\other -} - -\def\pushthisfilestack{% - \expandafter\pushthisfilestackX\popthisfilestack\StackTerm -} -\def\pushthisfilestackX{% - \expandafter\pushthisfilestackY\thisfile\StackTerm -} -\def\pushthisfilestackY #1\StackTerm #2\StackTerm {% - \gdef\popthisfilestack{\gdef\thisfile{#1}\gdef\popthisfilestack{#2}}% -} - -\def\popthisfilestack{\errthisfilestackempty} -\def\errthisfilestackempty{\errmessage{Internal error: - the stack of filenames is empty.}} - -\def\thisfile{} - -% @center line -% outputs that line, centered. -% -\parseargdef\center{% - \ifhmode - \let\next\centerH - \else - \let\next\centerV - \fi - \next{\hfil \ignorespaces#1\unskip \hfil}% -} -\def\centerH#1{% - {% - \hfil\break - \advance\hsize by -\leftskip - \advance\hsize by -\rightskip - \line{#1}% - \break - }% -} -\def\centerV#1{\line{\kern\leftskip #1\kern\rightskip}} - -% @sp n outputs n lines of vertical space - -\parseargdef\sp{\vskip #1\baselineskip} - -% @comment ...line which is ignored... -% @c is the same as @comment -% @ignore ... @end ignore is another way to write a comment - -\def\comment{\begingroup \catcode`\^^M=\other% -\catcode`\@=\other \catcode`\{=\other \catcode`\}=\other% -\commentxxx} -{\catcode`\^^M=\other \gdef\commentxxx#1^^M{\endgroup}} - -\let\c=\comment - -% @paragraphindent NCHARS -% We'll use ems for NCHARS, close enough. -% NCHARS can also be the word `asis' or `none'. -% We cannot feasibly implement @paragraphindent asis, though. -% -\def\asisword{asis} % no translation, these are keywords -\def\noneword{none} -% -\parseargdef\paragraphindent{% - \def\temp{#1}% - \ifx\temp\asisword - \else - \ifx\temp\noneword - \defaultparindent = 0pt - \else - \defaultparindent = #1em - \fi - \fi - \parindent = \defaultparindent -} - -% @exampleindent NCHARS -% We'll use ems for NCHARS like @paragraphindent. -% It seems @exampleindent asis isn't necessary, but -% I preserve it to make it similar to @paragraphindent. -\parseargdef\exampleindent{% - \def\temp{#1}% - \ifx\temp\asisword - \else - \ifx\temp\noneword - \lispnarrowing = 0pt - \else - \lispnarrowing = #1em - \fi - \fi -} - -% @firstparagraphindent WORD -% If WORD is `none', then suppress indentation of the first paragraph -% after a section heading. If WORD is `insert', then do indent at such -% paragraphs. -% -% The paragraph indentation is suppressed or not by calling -% \suppressfirstparagraphindent, which the sectioning commands do. -% We switch the definition of this back and forth according to WORD. -% By default, we suppress indentation. -% -\def\suppressfirstparagraphindent{\dosuppressfirstparagraphindent} -\def\insertword{insert} -% -\parseargdef\firstparagraphindent{% - \def\temp{#1}% - \ifx\temp\noneword - \let\suppressfirstparagraphindent = \dosuppressfirstparagraphindent - \else\ifx\temp\insertword - \let\suppressfirstparagraphindent = \relax - \else - \errhelp = \EMsimple - \errmessage{Unknown @firstparagraphindent option `\temp'}% - \fi\fi -} - -% Here is how we actually suppress indentation. Redefine \everypar to -% \kern backwards by \parindent, and then reset itself to empty. -% -% We also make \indent itself not actually do anything until the next -% paragraph. -% -\gdef\dosuppressfirstparagraphindent{% - \gdef\indent{% - \restorefirstparagraphindent - \indent - }% - \gdef\noindent{% - \restorefirstparagraphindent - \noindent - }% - \global\everypar = {% - \kern -\parindent - \restorefirstparagraphindent - }% -} - -\gdef\restorefirstparagraphindent{% - \global \let \indent = \ptexindent - \global \let \noindent = \ptexnoindent - \global \everypar = {}% -} - - -% @asis just yields its argument. Used with @table, for example. -% -\def\asis#1{#1} - -% @math outputs its argument in math mode. -% -% One complication: _ usually means subscripts, but it could also mean -% an actual _ character, as in @math{@var{some_variable} + 1}. So make -% _ active, and distinguish by seeing if the current family is \slfam, -% which is what @var uses. -{ - \catcode\underChar = \active - \gdef\mathunderscore{% - \catcode\underChar=\active - \def_{\ifnum\fam=\slfam \_\else\sb\fi}% - } -} -% Another complication: we want \\ (and @\) to output a \ character. -% FYI, plain.tex uses \\ as a temporary control sequence (why?), but -% this is not advertised and we don't care. Texinfo does not -% otherwise define @\. -% -% The \mathchar is class=0=ordinary, family=7=ttfam, position=5C=\. -\def\mathbackslash{\ifnum\fam=\ttfam \mathchar"075C \else\backslash \fi} -% -\def\math{% - \tex - \mathunderscore - \let\\ = \mathbackslash - \mathactive - $\finishmath -} -\def\finishmath#1{#1$\endgroup} % Close the group opened by \tex. - -% Some active characters (such as <) are spaced differently in math. -% We have to reset their definitions in case the @math was an argument -% to a command which sets the catcodes (such as @item or @section). -% -{ - \catcode`^ = \active - \catcode`< = \active - \catcode`> = \active - \catcode`+ = \active - \gdef\mathactive{% - \let^ = \ptexhat - \let< = \ptexless - \let> = \ptexgtr - \let+ = \ptexplus - } -} - -% @bullet and @minus need the same treatment as @math, just above. -\def\bullet{$\ptexbullet$} -\def\minus{$-$} - -% @dots{} outputs an ellipsis using the current font. -% We do .5em per period so that it has the same spacing in a typewriter -% font as three actual period characters. -% -\def\dots{% - \leavevmode - \hbox to 1.5em{% - \hskip 0pt plus 0.25fil - .\hfil.\hfil.% - \hskip 0pt plus 0.5fil - }% -} - -% @enddots{} is an end-of-sentence ellipsis. -% -\def\enddots{% - \dots - \spacefactor=\endofsentencespacefactor -} - -% @comma{} is so commas can be inserted into text without messing up -% Texinfo's parsing. -% -\let\comma = , - -% @refill is a no-op. -\let\refill=\relax - -% If working on a large document in chapters, it is convenient to -% be able to disable indexing, cross-referencing, and contents, for test runs. -% This is done with @novalidate (before @setfilename). -% -\newif\iflinks \linkstrue % by default we want the aux files. -\let\novalidate = \linksfalse - -% @setfilename is done at the beginning of every texinfo file. -% So open here the files we need to have open while reading the input. -% This makes it possible to make a .fmt file for texinfo. -\def\setfilename{% - \fixbackslash % Turn off hack to swallow `\input texinfo'. - \iflinks - \tryauxfile - % Open the new aux file. TeX will close it automatically at exit. - \immediate\openout\auxfile=\jobname.aux - \fi % \openindices needs to do some work in any case. - \openindices - \let\setfilename=\comment % Ignore extra @setfilename cmds. - % - % If texinfo.cnf is present on the system, read it. - % Useful for site-wide @afourpaper, etc. - \openin 1 texinfo.cnf - \ifeof 1 \else \input texinfo.cnf \fi - \closein 1 - % - \comment % Ignore the actual filename. -} - -% Called from \setfilename. -% -\def\openindices{% - \newindex{cp}% - \newcodeindex{fn}% - \newcodeindex{vr}% - \newcodeindex{tp}% - \newcodeindex{ky}% - \newcodeindex{pg}% -} - -% @bye. -\outer\def\bye{\pagealignmacro\tracingstats=1\ptexend} - - -\message{pdf,} -% adobe `portable' document format -\newcount\tempnum -\newcount\lnkcount -\newtoks\filename -\newcount\filenamelength -\newcount\pgn -\newtoks\toksA -\newtoks\toksB -\newtoks\toksC -\newtoks\toksD -\newbox\boxA -\newcount\countA -\newif\ifpdf -\newif\ifpdfmakepagedest - -% when pdftex is run in dvi mode, \pdfoutput is defined (so \pdfoutput=1 -% can be set). So we test for \relax and 0 as well as \undefined, -% borrowed from ifpdf.sty. -\ifx\pdfoutput\undefined -\else - \ifx\pdfoutput\relax - \else - \ifcase\pdfoutput - \else - \pdftrue - \fi - \fi -\fi - -% PDF uses PostScript string constants for the names of xref targets, to -% for display in the outlines, and in other places. Thus, we have to -% double any backslashes. Otherwise, a name like "\node" will be -% interpreted as a newline (\n), followed by o, d, e. Not good. -% http://www.ntg.nl/pipermail/ntg-pdftex/2004-July/000654.html -% (and related messages, the final outcome is that it is up to the TeX -% user to double the backslashes and otherwise make the string valid, so -% that's we do). - -% double active backslashes. -% -{\catcode`\@=0 \catcode`\\=\active - @gdef@activebackslash{@catcode`@\=@active @otherbackslash} - @gdef@activebackslashdouble{% - @catcode@backChar=@active - @let\=@doublebackslash} -} - -% To handle parens, we must adopt a different approach, since parens are -% not active characters. hyperref.dtx (which has the same problem as -% us) handles it with this amazing macro to replace tokens. I've -% tinkered with it a little for texinfo, but it's definitely from there. -% -% #1 is the tokens to replace. -% #2 is the replacement. -% #3 is the control sequence with the string. -% -\def\HyPsdSubst#1#2#3{% - \def\HyPsdReplace##1#1##2\END{% - ##1% - \ifx\\##2\\% - \else - #2% - \HyReturnAfterFi{% - \HyPsdReplace##2\END - }% - \fi - }% - \xdef#3{\expandafter\HyPsdReplace#3#1\END}% -} -\long\def\HyReturnAfterFi#1\fi{\fi#1} - -% #1 is a control sequence in which to do the replacements. -\def\backslashparens#1{% - \xdef#1{#1}% redefine it as its expansion; the definition is simply - % \lastnode when called from \setref -> \pdfmkdest. - \HyPsdSubst{(}{\backslashlparen}{#1}% - \HyPsdSubst{)}{\backslashrparen}{#1}% -} - -{\catcode\exclamChar = 0 \catcode\backChar = \other - !gdef!backslashlparen{\(}% - !gdef!backslashrparen{\)}% -} - -\ifpdf - \input pdfcolor - \pdfcatalog{/PageMode /UseOutlines}% - \def\dopdfimage#1#2#3{% - \def\imagewidth{#2}% - \def\imageheight{#3}% - % without \immediate, pdftex seg faults when the same image is - % included twice. (Version 3.14159-pre-1.0-unofficial-20010704.) - \ifnum\pdftexversion < 14 - \immediate\pdfimage - \else - \immediate\pdfximage - \fi - \ifx\empty\imagewidth\else width \imagewidth \fi - \ifx\empty\imageheight\else height \imageheight \fi - \ifnum\pdftexversion<13 - #1.pdf% - \else - {#1.pdf}% - \fi - \ifnum\pdftexversion < 14 \else - \pdfrefximage \pdflastximage - \fi} - \def\pdfmkdest#1{{% - % We have to set dummies so commands such as @code, and characters - % such as \, aren't expanded when present in a section title. - \atdummies - \activebackslashdouble - \def\pdfdestname{#1}% - \backslashparens\pdfdestname - \pdfdest name{\pdfdestname} xyz% - }}% - % - % used to mark target names; must be expandable. - \def\pdfmkpgn#1{#1}% - % - \let\linkcolor = \Blue % was Cyan, but that seems light? - \def\endlink{\Black\pdfendlink} - % Adding outlines to PDF; macros for calculating structure of outlines - % come from Petr Olsak - \def\expnumber#1{\expandafter\ifx\csname#1\endcsname\relax 0% - \else \csname#1\endcsname \fi} - \def\advancenumber#1{\tempnum=\expnumber{#1}\relax - \advance\tempnum by 1 - \expandafter\xdef\csname#1\endcsname{\the\tempnum}} - % - % #1 is the section text, which is what will be displayed in the - % outline by the pdf viewer. #2 is the pdf expression for the number - % of subentries (or empty, for subsubsections). #3 is the node text, - % which might be empty if this toc entry had no corresponding node. - % #4 is the page number - % - \def\dopdfoutline#1#2#3#4{% - % Generate a link to the node text if that exists; else, use the - % page number. We could generate a destination for the section - % text in the case where a section has no node, but it doesn't - % seem worth the trouble, since most documents are normally structured. - \def\pdfoutlinedest{#3}% - \ifx\pdfoutlinedest\empty - \def\pdfoutlinedest{#4}% - \else - % Doubled backslashes in the name. - {\activebackslashdouble \xdef\pdfoutlinedest{#3}% - \backslashparens\pdfoutlinedest}% - \fi - % - % Also double the backslashes in the display string. - {\activebackslashdouble \xdef\pdfoutlinetext{#1}% - \backslashparens\pdfoutlinetext}% - % - \pdfoutline goto name{\pdfmkpgn{\pdfoutlinedest}}#2{\pdfoutlinetext}% - } - % - \def\pdfmakeoutlines{% - \begingroup - % Thanh's hack / proper braces in bookmarks - \edef\mylbrace{\iftrue \string{\else}\fi}\let\{=\mylbrace - \edef\myrbrace{\iffalse{\else\string}\fi}\let\}=\myrbrace - % - % Read toc silently, to get counts of subentries for \pdfoutline. - \def\numchapentry##1##2##3##4{% - \def\thischapnum{##2}% - \def\thissecnum{0}% - \def\thissubsecnum{0}% - }% - \def\numsecentry##1##2##3##4{% - \advancenumber{chap\thischapnum}% - \def\thissecnum{##2}% - \def\thissubsecnum{0}% - }% - \def\numsubsecentry##1##2##3##4{% - \advancenumber{sec\thissecnum}% - \def\thissubsecnum{##2}% - }% - \def\numsubsubsecentry##1##2##3##4{% - \advancenumber{subsec\thissubsecnum}% - }% - \def\thischapnum{0}% - \def\thissecnum{0}% - \def\thissubsecnum{0}% - % - % use \def rather than \let here because we redefine \chapentry et - % al. a second time, below. - \def\appentry{\numchapentry}% - \def\appsecentry{\numsecentry}% - \def\appsubsecentry{\numsubsecentry}% - \def\appsubsubsecentry{\numsubsubsecentry}% - \def\unnchapentry{\numchapentry}% - \def\unnsecentry{\numsecentry}% - \def\unnsubsecentry{\numsubsecentry}% - \def\unnsubsubsecentry{\numsubsubsecentry}% - \readdatafile{toc}% - % - % Read toc second time, this time actually producing the outlines. - % The `-' means take the \expnumber as the absolute number of - % subentries, which we calculated on our first read of the .toc above. - % - % We use the node names as the destinations. - \def\numchapentry##1##2##3##4{% - \dopdfoutline{##1}{count-\expnumber{chap##2}}{##3}{##4}}% - \def\numsecentry##1##2##3##4{% - \dopdfoutline{##1}{count-\expnumber{sec##2}}{##3}{##4}}% - \def\numsubsecentry##1##2##3##4{% - \dopdfoutline{##1}{count-\expnumber{subsec##2}}{##3}{##4}}% - \def\numsubsubsecentry##1##2##3##4{% count is always zero - \dopdfoutline{##1}{}{##3}{##4}}% - % - % PDF outlines are displayed using system fonts, instead of - % document fonts. Therefore we cannot use special characters, - % since the encoding is unknown. For example, the eogonek from - % Latin 2 (0xea) gets translated to a | character. Info from - % Staszek Wawrykiewicz, 19 Jan 2004 04:09:24 +0100. - % - % xx to do this right, we have to translate 8-bit characters to - % their "best" equivalent, based on the @documentencoding. Right - % now, I guess we'll just let the pdf reader have its way. - \indexnofonts - \setupdatafile - \activebackslash - \input \jobname.toc - \endgroup - } - % - \def\skipspaces#1{\def\PP{#1}\def\D{|}% - \ifx\PP\D\let\nextsp\relax - \else\let\nextsp\skipspaces - \ifx\p\space\else\addtokens{\filename}{\PP}% - \advance\filenamelength by 1 - \fi - \fi - \nextsp} - \def\getfilename#1{\filenamelength=0\expandafter\skipspaces#1|\relax} - \ifnum\pdftexversion < 14 - \let \startlink \pdfannotlink - \else - \let \startlink \pdfstartlink - \fi - \def\pdfurl#1{% - \begingroup - \normalturnoffactive\def\@{@}% - \makevalueexpandable - \leavevmode\Red - \startlink attr{/Border [0 0 0]}% - user{/Subtype /Link /A << /S /URI /URI (#1) >>}% - \endgroup} - \def\pdfgettoks#1.{\setbox\boxA=\hbox{\toksA={#1.}\toksB={}\maketoks}} - \def\addtokens#1#2{\edef\addtoks{\noexpand#1={\the#1#2}}\addtoks} - \def\adn#1{\addtokens{\toksC}{#1}\global\countA=1\let\next=\maketoks} - \def\poptoks#1#2|ENDTOKS|{\let\first=#1\toksD={#1}\toksA={#2}} - \def\maketoks{% - \expandafter\poptoks\the\toksA|ENDTOKS|\relax - \ifx\first0\adn0 - \else\ifx\first1\adn1 \else\ifx\first2\adn2 \else\ifx\first3\adn3 - \else\ifx\first4\adn4 \else\ifx\first5\adn5 \else\ifx\first6\adn6 - \else\ifx\first7\adn7 \else\ifx\first8\adn8 \else\ifx\first9\adn9 - \else - \ifnum0=\countA\else\makelink\fi - \ifx\first.\let\next=\done\else - \let\next=\maketoks - \addtokens{\toksB}{\the\toksD} - \ifx\first,\addtokens{\toksB}{\space}\fi - \fi - \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi - \next} - \def\makelink{\addtokens{\toksB}% - {\noexpand\pdflink{\the\toksC}}\toksC={}\global\countA=0} - \def\pdflink#1{% - \startlink attr{/Border [0 0 0]} goto name{\pdfmkpgn{#1}} - \linkcolor #1\endlink} - \def\done{\edef\st{\global\noexpand\toksA={\the\toksB}}\st} -\else - \let\pdfmkdest = \gobble - \let\pdfurl = \gobble - \let\endlink = \relax - \let\linkcolor = \relax - \let\pdfmakeoutlines = \relax -\fi % \ifx\pdfoutput - - -\message{fonts,} - -% Change the current font style to #1, remembering it in \curfontstyle. -% For now, we do not accumulate font styles: @b{@i{foo}} prints foo in -% italics, not bold italics. -% -\def\setfontstyle#1{% - \def\curfontstyle{#1}% not as a control sequence, because we are \edef'd. - \csname ten#1\endcsname % change the current font -} - -% Select #1 fonts with the current style. -% -\def\selectfonts#1{\csname #1fonts\endcsname \csname\curfontstyle\endcsname} - -\def\rm{\fam=0 \setfontstyle{rm}} -\def\it{\fam=\itfam \setfontstyle{it}} -\def\sl{\fam=\slfam \setfontstyle{sl}} -\def\bf{\fam=\bffam \setfontstyle{bf}}\def\bfstylename{bf} -\def\tt{\fam=\ttfam \setfontstyle{tt}} - -% Texinfo sort of supports the sans serif font style, which plain TeX does not. -% So we set up a \sf. -\newfam\sffam -\def\sf{\fam=\sffam \setfontstyle{sf}} -\let\li = \sf % Sometimes we call it \li, not \sf. - -% We don't need math for this font style. -\def\ttsl{\setfontstyle{ttsl}} - -% Default leading. -\newdimen\textleading \textleading = 13.2pt - -% Set the baselineskip to #1, and the lineskip and strut size -% correspondingly. There is no deep meaning behind these magic numbers -% used as factors; they just match (closely enough) what Knuth defined. -% -\def\lineskipfactor{.08333} -\def\strutheightpercent{.70833} -\def\strutdepthpercent {.29167} -% -\def\setleading#1{% - \normalbaselineskip = #1\relax - \normallineskip = \lineskipfactor\normalbaselineskip - \normalbaselines - \setbox\strutbox =\hbox{% - \vrule width0pt height\strutheightpercent\baselineskip - depth \strutdepthpercent \baselineskip - }% -} - -% Set the font macro #1 to the font named #2, adding on the -% specified font prefix (normally `cm'). -% #3 is the font's design size, #4 is a scale factor -\def\setfont#1#2#3#4{\font#1=\fontprefix#2#3 scaled #4} - -% Use cm as the default font prefix. -% To specify the font prefix, you must define \fontprefix -% before you read in texinfo.tex. -\ifx\fontprefix\undefined -\def\fontprefix{cm} -\fi -% Support font families that don't use the same naming scheme as CM. -\def\rmshape{r} -\def\rmbshape{bx} %where the normal face is bold -\def\bfshape{b} -\def\bxshape{bx} -\def\ttshape{tt} -\def\ttbshape{tt} -\def\ttslshape{sltt} -\def\itshape{ti} -\def\itbshape{bxti} -\def\slshape{sl} -\def\slbshape{bxsl} -\def\sfshape{ss} -\def\sfbshape{ss} -\def\scshape{csc} -\def\scbshape{csc} - -% Text fonts (11.2pt, magstep1). -\def\textnominalsize{11pt} -\edef\mainmagstep{\magstephalf} -\setfont\textrm\rmshape{10}{\mainmagstep} -\setfont\texttt\ttshape{10}{\mainmagstep} -\setfont\textbf\bfshape{10}{\mainmagstep} -\setfont\textit\itshape{10}{\mainmagstep} -\setfont\textsl\slshape{10}{\mainmagstep} -\setfont\textsf\sfshape{10}{\mainmagstep} -\setfont\textsc\scshape{10}{\mainmagstep} -\setfont\textttsl\ttslshape{10}{\mainmagstep} -\font\texti=cmmi10 scaled \mainmagstep -\font\textsy=cmsy10 scaled \mainmagstep - -% A few fonts for @defun names and args. -\setfont\defbf\bfshape{10}{\magstep1} -\setfont\deftt\ttshape{10}{\magstep1} -\setfont\defttsl\ttslshape{10}{\magstep1} -\def\df{\let\tentt=\deftt \let\tenbf = \defbf \let\tenttsl=\defttsl \bf} - -% Fonts for indices, footnotes, small examples (9pt). -\def\smallnominalsize{9pt} -\setfont\smallrm\rmshape{9}{1000} -\setfont\smalltt\ttshape{9}{1000} -\setfont\smallbf\bfshape{10}{900} -\setfont\smallit\itshape{9}{1000} -\setfont\smallsl\slshape{9}{1000} -\setfont\smallsf\sfshape{9}{1000} -\setfont\smallsc\scshape{10}{900} -\setfont\smallttsl\ttslshape{10}{900} -\font\smalli=cmmi9 -\font\smallsy=cmsy9 - -% Fonts for small examples (8pt). -\def\smallernominalsize{8pt} -\setfont\smallerrm\rmshape{8}{1000} -\setfont\smallertt\ttshape{8}{1000} -\setfont\smallerbf\bfshape{10}{800} -\setfont\smallerit\itshape{8}{1000} -\setfont\smallersl\slshape{8}{1000} -\setfont\smallersf\sfshape{8}{1000} -\setfont\smallersc\scshape{10}{800} -\setfont\smallerttsl\ttslshape{10}{800} -\font\smalleri=cmmi8 -\font\smallersy=cmsy8 - -% Fonts for title page (20.4pt): -\def\titlenominalsize{20pt} -\setfont\titlerm\rmbshape{12}{\magstep3} -\setfont\titleit\itbshape{10}{\magstep4} -\setfont\titlesl\slbshape{10}{\magstep4} -\setfont\titlett\ttbshape{12}{\magstep3} -\setfont\titlettsl\ttslshape{10}{\magstep4} -\setfont\titlesf\sfbshape{17}{\magstep1} -\let\titlebf=\titlerm -\setfont\titlesc\scbshape{10}{\magstep4} -\font\titlei=cmmi12 scaled \magstep3 -\font\titlesy=cmsy10 scaled \magstep4 -\def\authorrm{\secrm} -\def\authortt{\sectt} - -% Chapter (and unnumbered) fonts (17.28pt). -\def\chapnominalsize{17pt} -\setfont\chaprm\rmbshape{12}{\magstep2} -\setfont\chapit\itbshape{10}{\magstep3} -\setfont\chapsl\slbshape{10}{\magstep3} -\setfont\chaptt\ttbshape{12}{\magstep2} -\setfont\chapttsl\ttslshape{10}{\magstep3} -\setfont\chapsf\sfbshape{17}{1000} -\let\chapbf=\chaprm -\setfont\chapsc\scbshape{10}{\magstep3} -\font\chapi=cmmi12 scaled \magstep2 -\font\chapsy=cmsy10 scaled \magstep3 - -% Section fonts (14.4pt). -\def\secnominalsize{14pt} -\setfont\secrm\rmbshape{12}{\magstep1} -\setfont\secit\itbshape{10}{\magstep2} -\setfont\secsl\slbshape{10}{\magstep2} -\setfont\sectt\ttbshape{12}{\magstep1} -\setfont\secttsl\ttslshape{10}{\magstep2} -\setfont\secsf\sfbshape{12}{\magstep1} -\let\secbf\secrm -\setfont\secsc\scbshape{10}{\magstep2} -\font\seci=cmmi12 scaled \magstep1 -\font\secsy=cmsy10 scaled \magstep2 - -% Subsection fonts (13.15pt). -\def\ssecnominalsize{13pt} -\setfont\ssecrm\rmbshape{12}{\magstephalf} -\setfont\ssecit\itbshape{10}{1315} -\setfont\ssecsl\slbshape{10}{1315} -\setfont\ssectt\ttbshape{12}{\magstephalf} -\setfont\ssecttsl\ttslshape{10}{1315} -\setfont\ssecsf\sfbshape{12}{\magstephalf} -\let\ssecbf\ssecrm -\setfont\ssecsc\scbshape{10}{1315} -\font\sseci=cmmi12 scaled \magstephalf -\font\ssecsy=cmsy10 scaled 1315 - -% Reduced fonts for @acro in text (10pt). -\def\reducednominalsize{10pt} -\setfont\reducedrm\rmshape{10}{1000} -\setfont\reducedtt\ttshape{10}{1000} -\setfont\reducedbf\bfshape{10}{1000} -\setfont\reducedit\itshape{10}{1000} -\setfont\reducedsl\slshape{10}{1000} -\setfont\reducedsf\sfshape{10}{1000} -\setfont\reducedsc\scshape{10}{1000} -\setfont\reducedttsl\ttslshape{10}{1000} -\font\reducedi=cmmi10 -\font\reducedsy=cmsy10 - -% In order for the font changes to affect most math symbols and letters, -% we have to define the \textfont of the standard families. Since -% texinfo doesn't allow for producing subscripts and superscripts except -% in the main text, we don't bother to reset \scriptfont and -% \scriptscriptfont (which would also require loading a lot more fonts). -% -\def\resetmathfonts{% - \textfont0=\tenrm \textfont1=\teni \textfont2=\tensy - \textfont\itfam=\tenit \textfont\slfam=\tensl \textfont\bffam=\tenbf - \textfont\ttfam=\tentt \textfont\sffam=\tensf -} - -% The font-changing commands redefine the meanings of \tenSTYLE, instead -% of just \STYLE. We do this because \STYLE needs to also set the -% current \fam for math mode. Our \STYLE (e.g., \rm) commands hardwire -% \tenSTYLE to set the current font. -% -% Each font-changing command also sets the names \lsize (one size lower) -% and \lllsize (three sizes lower). These relative commands are used in -% the LaTeX logo and acronyms. -% -% This all needs generalizing, badly. -% -\def\textfonts{% - \let\tenrm=\textrm \let\tenit=\textit \let\tensl=\textsl - \let\tenbf=\textbf \let\tentt=\texttt \let\smallcaps=\textsc - \let\tensf=\textsf \let\teni=\texti \let\tensy=\textsy - \let\tenttsl=\textttsl - \def\curfontsize{text}% - \def\lsize{reduced}\def\lllsize{smaller}% - \resetmathfonts \setleading{\textleading}} -\def\titlefonts{% - \let\tenrm=\titlerm \let\tenit=\titleit \let\tensl=\titlesl - \let\tenbf=\titlebf \let\tentt=\titlett \let\smallcaps=\titlesc - \let\tensf=\titlesf \let\teni=\titlei \let\tensy=\titlesy - \let\tenttsl=\titlettsl - \def\curfontsize{title}% - \def\lsize{chap}\def\lllsize{subsec}% - \resetmathfonts \setleading{25pt}} -\def\titlefont#1{{\titlefonts\rm #1}} -\def\chapfonts{% - \let\tenrm=\chaprm \let\tenit=\chapit \let\tensl=\chapsl - \let\tenbf=\chapbf \let\tentt=\chaptt \let\smallcaps=\chapsc - \let\tensf=\chapsf \let\teni=\chapi \let\tensy=\chapsy - \let\tenttsl=\chapttsl - \def\curfontsize{chap}% - \def\lsize{sec}\def\lllsize{text}% - \resetmathfonts \setleading{19pt}} -\def\secfonts{% - \let\tenrm=\secrm \let\tenit=\secit \let\tensl=\secsl - \let\tenbf=\secbf \let\tentt=\sectt \let\smallcaps=\secsc - \let\tensf=\secsf \let\teni=\seci \let\tensy=\secsy - \let\tenttsl=\secttsl - \def\curfontsize{sec}% - \def\lsize{subsec}\def\lllsize{reduced}% - \resetmathfonts \setleading{16pt}} -\def\subsecfonts{% - \let\tenrm=\ssecrm \let\tenit=\ssecit \let\tensl=\ssecsl - \let\tenbf=\ssecbf \let\tentt=\ssectt \let\smallcaps=\ssecsc - \let\tensf=\ssecsf \let\teni=\sseci \let\tensy=\ssecsy - \let\tenttsl=\ssecttsl - \def\curfontsize{ssec}% - \def\lsize{text}\def\lllsize{small}% - \resetmathfonts \setleading{15pt}} -\let\subsubsecfonts = \subsecfonts -\def\reducedfonts{% - \let\tenrm=\reducedrm \let\tenit=\reducedit \let\tensl=\reducedsl - \let\tenbf=\reducedbf \let\tentt=\reducedtt \let\reducedcaps=\reducedsc - \let\tensf=\reducedsf \let\teni=\reducedi \let\tensy=\reducedsy - \let\tenttsl=\reducedttsl - \def\curfontsize{reduced}% - \def\lsize{small}\def\lllsize{smaller}% - \resetmathfonts \setleading{10.5pt}} -\def\smallfonts{% - \let\tenrm=\smallrm \let\tenit=\smallit \let\tensl=\smallsl - \let\tenbf=\smallbf \let\tentt=\smalltt \let\smallcaps=\smallsc - \let\tensf=\smallsf \let\teni=\smalli \let\tensy=\smallsy - \let\tenttsl=\smallttsl - \def\curfontsize{small}% - \def\lsize{smaller}\def\lllsize{smaller}% - \resetmathfonts \setleading{10.5pt}} -\def\smallerfonts{% - \let\tenrm=\smallerrm \let\tenit=\smallerit \let\tensl=\smallersl - \let\tenbf=\smallerbf \let\tentt=\smallertt \let\smallcaps=\smallersc - \let\tensf=\smallersf \let\teni=\smalleri \let\tensy=\smallersy - \let\tenttsl=\smallerttsl - \def\curfontsize{smaller}% - \def\lsize{smaller}\def\lllsize{smaller}% - \resetmathfonts \setleading{9.5pt}} - -% Set the fonts to use with the @small... environments. -\let\smallexamplefonts = \smallfonts - -% About \smallexamplefonts. If we use \smallfonts (9pt), @smallexample -% can fit this many characters: -% 8.5x11=86 smallbook=72 a4=90 a5=69 -% If we use \scriptfonts (8pt), then we can fit this many characters: -% 8.5x11=90+ smallbook=80 a4=90+ a5=77 -% For me, subjectively, the few extra characters that fit aren't worth -% the additional smallness of 8pt. So I'm making the default 9pt. -% -% By the way, for comparison, here's what fits with @example (10pt): -% 8.5x11=71 smallbook=60 a4=75 a5=58 -% -% I wish the USA used A4 paper. -% --karl, 24jan03. - - -% Set up the default fonts, so we can use them for creating boxes. -% -\textfonts \rm - -% Define these so they can be easily changed for other fonts. -\def\angleleft{$\langle$} -\def\angleright{$\rangle$} - -% Count depth in font-changes, for error checks -\newcount\fontdepth \fontdepth=0 - -% Fonts for short table of contents. -\setfont\shortcontrm\rmshape{12}{1000} -\setfont\shortcontbf\bfshape{10}{\magstep1} % no cmb12 -\setfont\shortcontsl\slshape{12}{1000} -\setfont\shortconttt\ttshape{12}{1000} - -%% Add scribe-like font environments, plus @l for inline lisp (usually sans -%% serif) and @ii for TeX italic - -% \smartitalic{ARG} outputs arg in italics, followed by an italic correction -% unless the following character is such as not to need one. -\def\smartitalicx{\ifx\next,\else\ifx\next-\else\ifx\next.\else - \ptexslash\fi\fi\fi} -\def\smartslanted#1{{\ifusingtt\ttsl\sl #1}\futurelet\next\smartitalicx} -\def\smartitalic#1{{\ifusingtt\ttsl\it #1}\futurelet\next\smartitalicx} - -% like \smartslanted except unconditionally uses \ttsl. -% @var is set to this for defun arguments. -\def\ttslanted#1{{\ttsl #1}\futurelet\next\smartitalicx} - -% like \smartslanted except unconditionally use \sl. We never want -% ttsl for book titles, do we? -\def\cite#1{{\sl #1}\futurelet\next\smartitalicx} - -\let\i=\smartitalic -\let\slanted=\smartslanted -\let\var=\smartslanted -\let\dfn=\smartslanted -\let\emph=\smartitalic - -% @b, explicit bold. -\def\b#1{{\bf #1}} -\let\strong=\b - -% @sansserif, explicit sans. -\def\sansserif#1{{\sf #1}} - -% We can't just use \exhyphenpenalty, because that only has effect at -% the end of a paragraph. Restore normal hyphenation at the end of the -% group within which \nohyphenation is presumably called. -% -\def\nohyphenation{\hyphenchar\font = -1 \aftergroup\restorehyphenation} -\def\restorehyphenation{\hyphenchar\font = `- } - -% Set sfcode to normal for the chars that usually have another value. -% Can't use plain's \frenchspacing because it uses the `\x notation, and -% sometimes \x has an active definition that messes things up. -% -\catcode`@=11 - \def\plainfrenchspacing{% - \sfcode\dotChar =\@m \sfcode\questChar=\@m \sfcode\exclamChar=\@m - \sfcode\colonChar=\@m \sfcode\semiChar =\@m \sfcode\commaChar =\@m - \def\endofsentencespacefactor{1000}% for @. and friends - } - \def\plainnonfrenchspacing{% - \sfcode`\.3000\sfcode`\?3000\sfcode`\!3000 - \sfcode`\:2000\sfcode`\;1500\sfcode`\,1250 - \def\endofsentencespacefactor{3000}% for @. and friends - } -\catcode`@=\other -\def\endofsentencespacefactor{3000}% default - -\def\t#1{% - {\tt \rawbackslash \plainfrenchspacing #1}% - \null -} -\def\samp#1{`\tclose{#1}'\null} -\setfont\keyrm\rmshape{8}{1000} -\font\keysy=cmsy9 -\def\key#1{{\keyrm\textfont2=\keysy \leavevmode\hbox{% - \raise0.4pt\hbox{\angleleft}\kern-.08em\vtop{% - \vbox{\hrule\kern-0.4pt - \hbox{\raise0.4pt\hbox{\vphantom{\angleleft}}#1}}% - \kern-0.4pt\hrule}% - \kern-.06em\raise0.4pt\hbox{\angleright}}}} -% The old definition, with no lozenge: -%\def\key #1{{\ttsl \nohyphenation \uppercase{#1}}\null} -\def\ctrl #1{{\tt \rawbackslash \hat}#1} - -% @file, @option are the same as @samp. -\let\file=\samp -\let\option=\samp - -% @code is a modification of @t, -% which makes spaces the same size as normal in the surrounding text. -\def\tclose#1{% - {% - % Change normal interword space to be same as for the current font. - \spaceskip = \fontdimen2\font - % - % Switch to typewriter. - \tt - % - % But `\ ' produces the large typewriter interword space. - \def\ {{\spaceskip = 0pt{} }}% - % - % Turn off hyphenation. - \nohyphenation - % - \rawbackslash - \plainfrenchspacing - #1% - }% - \null -} - -% We *must* turn on hyphenation at `-' and `_' in @code. -% Otherwise, it is too hard to avoid overfull hboxes -% in the Emacs manual, the Library manual, etc. - -% Unfortunately, TeX uses one parameter (\hyphenchar) to control -% both hyphenation at - and hyphenation within words. -% We must therefore turn them both off (\tclose does that) -% and arrange explicitly to hyphenate at a dash. -% -- rms. -{ - \catcode`\-=\active - \catcode`\_=\active - % - \global\def\code{\begingroup - \catcode`\-=\active \catcode`\_=\active - \ifallowcodebreaks - \let-\codedash - \let_\codeunder - \else - \let-\realdash - \let_\realunder - \fi - \codex - } -} - -\def\realdash{-} -\def\codedash{-\discretionary{}{}{}} -\def\codeunder{% - % this is all so @math{@code{var_name}+1} can work. In math mode, _ - % is "active" (mathcode"8000) and \normalunderscore (or \char95, etc.) - % will therefore expand the active definition of _, which is us - % (inside @code that is), therefore an endless loop. - \ifusingtt{\ifmmode - \mathchar"075F % class 0=ordinary, family 7=ttfam, pos 0x5F=_. - \else\normalunderscore \fi - \discretionary{}{}{}}% - {\_}% -} -\def\codex #1{\tclose{#1}\endgroup} - -% An additional complication: the above will allow breaks after, e.g., -% each of the four underscores in __typeof__. This is undesirable in -% some manuals, especially if they don't have long identifiers in -% general. @allowcodebreaks provides a way to control this. -% -\newif\ifallowcodebreaks \allowcodebreakstrue - -\def\keywordtrue{true} -\def\keywordfalse{false} - -\parseargdef\allowcodebreaks{% - \def\txiarg{#1}% - \ifx\txiarg\keywordtrue - \allowcodebreakstrue - \else\ifx\txiarg\keywordfalse - \allowcodebreaksfalse - \else - \errhelp = \EMsimple - \errmessage{Unknown @allowcodebreaks option `\txiarg'}% - \fi\fi -} - -% @kbd is like @code, except that if the argument is just one @key command, -% then @kbd has no effect. - -% @kbdinputstyle -- arg is `distinct' (@kbd uses slanted tty font always), -% `example' (@kbd uses ttsl only inside of @example and friends), -% or `code' (@kbd uses normal tty font always). -\parseargdef\kbdinputstyle{% - \def\txiarg{#1}% - \ifx\txiarg\worddistinct - \gdef\kbdexamplefont{\ttsl}\gdef\kbdfont{\ttsl}% - \else\ifx\txiarg\wordexample - \gdef\kbdexamplefont{\ttsl}\gdef\kbdfont{\tt}% - \else\ifx\txiarg\wordcode - \gdef\kbdexamplefont{\tt}\gdef\kbdfont{\tt}% - \else - \errhelp = \EMsimple - \errmessage{Unknown @kbdinputstyle option `\txiarg'}% - \fi\fi\fi -} -\def\worddistinct{distinct} -\def\wordexample{example} -\def\wordcode{code} - -% Default is `distinct.' -\kbdinputstyle distinct - -\def\xkey{\key} -\def\kbdfoo#1#2#3\par{\def\one{#1}\def\three{#3}\def\threex{??}% -\ifx\one\xkey\ifx\threex\three \key{#2}% -\else{\tclose{\kbdfont\look}}\fi -\else{\tclose{\kbdfont\look}}\fi} - -% For @indicateurl, @env, @command quotes seem unnecessary, so use \code. -\let\indicateurl=\code -\let\env=\code -\let\command=\code - -% @uref (abbreviation for `urlref') takes an optional (comma-separated) -% second argument specifying the text to display and an optional third -% arg as text to display instead of (rather than in addition to) the url -% itself. First (mandatory) arg is the url. Perhaps eventually put in -% a hypertex \special here. -% -\def\uref#1{\douref #1,,,\finish} -\def\douref#1,#2,#3,#4\finish{\begingroup - \unsepspaces - \pdfurl{#1}% - \setbox0 = \hbox{\ignorespaces #3}% - \ifdim\wd0 > 0pt - \unhbox0 % third arg given, show only that - \else - \setbox0 = \hbox{\ignorespaces #2}% - \ifdim\wd0 > 0pt - \ifpdf - \unhbox0 % PDF: 2nd arg given, show only it - \else - \unhbox0\ (\code{#1})% DVI: 2nd arg given, show both it and url - \fi - \else - \code{#1}% only url given, so show it - \fi - \fi - \endlink -\endgroup} - -% @url synonym for @uref, since that's how everyone uses it. -% -\let\url=\uref - -% rms does not like angle brackets --karl, 17may97. -% So now @email is just like @uref, unless we are pdf. -% -%\def\email#1{\angleleft{\tt #1}\angleright} -\ifpdf - \def\email#1{\doemail#1,,\finish} - \def\doemail#1,#2,#3\finish{\begingroup - \unsepspaces - \pdfurl{mailto:#1}% - \setbox0 = \hbox{\ignorespaces #2}% - \ifdim\wd0>0pt\unhbox0\else\code{#1}\fi - \endlink - \endgroup} -\else - \let\email=\uref -\fi - -% Check if we are currently using a typewriter font. Since all the -% Computer Modern typewriter fonts have zero interword stretch (and -% shrink), and it is reasonable to expect all typewriter fonts to have -% this property, we can check that font parameter. -% -\def\ifmonospace{\ifdim\fontdimen3\font=0pt } - -% Typeset a dimension, e.g., `in' or `pt'. The only reason for the -% argument is to make the input look right: @dmn{pt} instead of @dmn{}pt. -% -\def\dmn#1{\thinspace #1} - -\def\kbd#1{\def\look{#1}\expandafter\kbdfoo\look??\par} - -% @l was never documented to mean ``switch to the Lisp font'', -% and it is not used as such in any manual I can find. We need it for -% Polish suppressed-l. --karl, 22sep96. -%\def\l#1{{\li #1}\null} - -% Explicit font changes: @r, @sc, undocumented @ii. -\def\r#1{{\rm #1}} % roman font -\def\sc#1{{\smallcaps#1}} % smallcaps font -\def\ii#1{{\it #1}} % italic font - -% @acronym for "FBI", "NATO", and the like. -% We print this one point size smaller, since it's intended for -% all-uppercase. -% -\def\acronym#1{\doacronym #1,,\finish} -\def\doacronym#1,#2,#3\finish{% - {\selectfonts\lsize #1}% - \def\temp{#2}% - \ifx\temp\empty \else - \space ({\unsepspaces \ignorespaces \temp \unskip})% - \fi -} - -% @abbr for "Comput. J." and the like. -% No font change, but don't do end-of-sentence spacing. -% -\def\abbr#1{\doabbr #1,,\finish} -\def\doabbr#1,#2,#3\finish{% - {\plainfrenchspacing #1}% - \def\temp{#2}% - \ifx\temp\empty \else - \space ({\unsepspaces \ignorespaces \temp \unskip})% - \fi -} - -% @pounds{} is a sterling sign, which Knuth put in the CM italic font. -% -\def\pounds{{\it\$}} - -% @euro{} comes from a separate font, depending on the current style. -% We use the free feym* fonts from the eurosym package by Henrik -% Theiling, which support regular, slanted, bold and bold slanted (and -% "outlined" (blackboard board, sort of) versions, which we don't need). -% It is available from http://www.ctan.org/tex-archive/fonts/eurosym. -% -% Although only regular is the truly official Euro symbol, we ignore -% that. The Euro is designed to be slightly taller than the regular -% font height. -% -% feymr - regular -% feymo - slanted -% feybr - bold -% feybo - bold slanted -% -% There is no good (free) typewriter version, to my knowledge. -% A feymr10 euro is ~7.3pt wide, while a normal cmtt10 char is ~5.25pt wide. -% Hmm. -% -% Also doesn't work in math. Do we need to do math with euro symbols? -% Hope not. -% -% -\def\euro{{\eurofont e}} -\def\eurofont{% - % We set the font at each command, rather than predefining it in - % \textfonts and the other font-switching commands, so that - % installations which never need the symbol don't have to have the - % font installed. - % - % There is only one designed size (nominal 10pt), so we always scale - % that to the current nominal size. - % - % By the way, simply using "at 1em" works for cmr10 and the like, but - % does not work for cmbx10 and other extended/shrunken fonts. - % - \def\eurosize{\csname\curfontsize nominalsize\endcsname}% - % - \ifx\curfontstyle\bfstylename - % bold: - \font\thiseurofont = \ifusingit{feybo10}{feybr10} at \eurosize - \else - % regular: - \font\thiseurofont = \ifusingit{feymo10}{feymr10} at \eurosize - \fi - \thiseurofont -} - -% @registeredsymbol - R in a circle. The font for the R should really -% be smaller yet, but lllsize is the best we can do for now. -% Adapted from the plain.tex definition of \copyright. -% -\def\registeredsymbol{% - $^{{\ooalign{\hfil\raise.07ex\hbox{\selectfonts\lllsize R}% - \hfil\crcr\Orb}}% - }$% -} - -% Laurent Siebenmann reports \Orb undefined with: -% Textures 1.7.7 (preloaded format=plain 93.10.14) (68K) 16 APR 2004 02:38 -% so we'll define it if necessary. -% -\ifx\Orb\undefined -\def\Orb{\mathhexbox20D} -\fi - - -\message{page headings,} - -\newskip\titlepagetopglue \titlepagetopglue = 1.5in -\newskip\titlepagebottomglue \titlepagebottomglue = 2pc - -% First the title page. Must do @settitle before @titlepage. -\newif\ifseenauthor -\newif\iffinishedtitlepage - -% Do an implicit @contents or @shortcontents after @end titlepage if the -% user says @setcontentsaftertitlepage or @setshortcontentsaftertitlepage. -% -\newif\ifsetcontentsaftertitlepage - \let\setcontentsaftertitlepage = \setcontentsaftertitlepagetrue -\newif\ifsetshortcontentsaftertitlepage - \let\setshortcontentsaftertitlepage = \setshortcontentsaftertitlepagetrue - -\parseargdef\shorttitlepage{\begingroup\hbox{}\vskip 1.5in \chaprm \centerline{#1}% - \endgroup\page\hbox{}\page} - -\envdef\titlepage{% - % Open one extra group, as we want to close it in the middle of \Etitlepage. - \begingroup - \parindent=0pt \textfonts - % Leave some space at the very top of the page. - \vglue\titlepagetopglue - % No rule at page bottom unless we print one at the top with @title. - \finishedtitlepagetrue - % - % Most title ``pages'' are actually two pages long, with space - % at the top of the second. We don't want the ragged left on the second. - \let\oldpage = \page - \def\page{% - \iffinishedtitlepage\else - \finishtitlepage - \fi - \let\page = \oldpage - \page - \null - }% -} - -\def\Etitlepage{% - \iffinishedtitlepage\else - \finishtitlepage - \fi - % It is important to do the page break before ending the group, - % because the headline and footline are only empty inside the group. - % If we use the new definition of \page, we always get a blank page - % after the title page, which we certainly don't want. - \oldpage - \endgroup - % - % Need this before the \...aftertitlepage checks so that if they are - % in effect the toc pages will come out with page numbers. - \HEADINGSon - % - % If they want short, they certainly want long too. - \ifsetshortcontentsaftertitlepage - \shortcontents - \contents - \global\let\shortcontents = \relax - \global\let\contents = \relax - \fi - % - \ifsetcontentsaftertitlepage - \contents - \global\let\contents = \relax - \global\let\shortcontents = \relax - \fi -} - -\def\finishtitlepage{% - \vskip4pt \hrule height 2pt width \hsize - \vskip\titlepagebottomglue - \finishedtitlepagetrue -} - -%%% Macros to be used within @titlepage: - -\let\subtitlerm=\tenrm -\def\subtitlefont{\subtitlerm \normalbaselineskip = 13pt \normalbaselines} - -\def\authorfont{\authorrm \normalbaselineskip = 16pt \normalbaselines - \let\tt=\authortt} - -\parseargdef\title{% - \checkenv\titlepage - \leftline{\titlefonts\rm #1} - % print a rule at the page bottom also. - \finishedtitlepagefalse - \vskip4pt \hrule height 4pt width \hsize \vskip4pt -} - -\parseargdef\subtitle{% - \checkenv\titlepage - {\subtitlefont \rightline{#1}}% -} - -% @author should come last, but may come many times. -% It can also be used inside @quotation. -% -\parseargdef\author{% - \def\temp{\quotation}% - \ifx\thisenv\temp - \def\quotationauthor{#1}% printed in \Equotation. - \else - \checkenv\titlepage - \ifseenauthor\else \vskip 0pt plus 1filll \seenauthortrue \fi - {\authorfont \leftline{#1}}% - \fi -} - - -%%% Set up page headings and footings. - -\let\thispage=\folio - -\newtoks\evenheadline % headline on even pages -\newtoks\oddheadline % headline on odd pages -\newtoks\evenfootline % footline on even pages -\newtoks\oddfootline % footline on odd pages - -% Now make TeX use those variables -\headline={{\textfonts\rm \ifodd\pageno \the\oddheadline - \else \the\evenheadline \fi}} -\footline={{\textfonts\rm \ifodd\pageno \the\oddfootline - \else \the\evenfootline \fi}\HEADINGShook} -\let\HEADINGShook=\relax - -% Commands to set those variables. -% For example, this is what @headings on does -% @evenheading @thistitle|@thispage|@thischapter -% @oddheading @thischapter|@thispage|@thistitle -% @evenfooting @thisfile|| -% @oddfooting ||@thisfile - - -\def\evenheading{\parsearg\evenheadingxxx} -\def\evenheadingxxx #1{\evenheadingyyy #1\|\|\|\|\finish} -\def\evenheadingyyy #1\|#2\|#3\|#4\finish{% -\global\evenheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}} - -\def\oddheading{\parsearg\oddheadingxxx} -\def\oddheadingxxx #1{\oddheadingyyy #1\|\|\|\|\finish} -\def\oddheadingyyy #1\|#2\|#3\|#4\finish{% -\global\oddheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}} - -\parseargdef\everyheading{\oddheadingxxx{#1}\evenheadingxxx{#1}}% - -\def\evenfooting{\parsearg\evenfootingxxx} -\def\evenfootingxxx #1{\evenfootingyyy #1\|\|\|\|\finish} -\def\evenfootingyyy #1\|#2\|#3\|#4\finish{% -\global\evenfootline={\rlap{\centerline{#2}}\line{#1\hfil#3}}} - -\def\oddfooting{\parsearg\oddfootingxxx} -\def\oddfootingxxx #1{\oddfootingyyy #1\|\|\|\|\finish} -\def\oddfootingyyy #1\|#2\|#3\|#4\finish{% - \global\oddfootline = {\rlap{\centerline{#2}}\line{#1\hfil#3}}% - % - % Leave some space for the footline. Hopefully ok to assume - % @evenfooting will not be used by itself. - \global\advance\pageheight by -\baselineskip - \global\advance\vsize by -\baselineskip -} - -\parseargdef\everyfooting{\oddfootingxxx{#1}\evenfootingxxx{#1}} - - -% @headings double turns headings on for double-sided printing. -% @headings single turns headings on for single-sided printing. -% @headings off turns them off. -% @headings on same as @headings double, retained for compatibility. -% @headings after turns on double-sided headings after this page. -% @headings doubleafter turns on double-sided headings after this page. -% @headings singleafter turns on single-sided headings after this page. -% By default, they are off at the start of a document, -% and turned `on' after @end titlepage. - -\def\headings #1 {\csname HEADINGS#1\endcsname} - -\def\HEADINGSoff{% -\global\evenheadline={\hfil} \global\evenfootline={\hfil} -\global\oddheadline={\hfil} \global\oddfootline={\hfil}} -\HEADINGSoff -% When we turn headings on, set the page number to 1. -% For double-sided printing, put current file name in lower left corner, -% chapter name on inside top of right hand pages, document -% title on inside top of left hand pages, and page numbers on outside top -% edge of all pages. -\def\HEADINGSdouble{% -\global\pageno=1 -\global\evenfootline={\hfil} -\global\oddfootline={\hfil} -\global\evenheadline={\line{\folio\hfil\thistitle}} -\global\oddheadline={\line{\thischapter\hfil\folio}} -\global\let\contentsalignmacro = \chapoddpage -} -\let\contentsalignmacro = \chappager - -% For single-sided printing, chapter title goes across top left of page, -% page number on top right. -\def\HEADINGSsingle{% -\global\pageno=1 -\global\evenfootline={\hfil} -\global\oddfootline={\hfil} -\global\evenheadline={\line{\thischapter\hfil\folio}} -\global\oddheadline={\line{\thischapter\hfil\folio}} -\global\let\contentsalignmacro = \chappager -} -\def\HEADINGSon{\HEADINGSdouble} - -\def\HEADINGSafter{\let\HEADINGShook=\HEADINGSdoublex} -\let\HEADINGSdoubleafter=\HEADINGSafter -\def\HEADINGSdoublex{% -\global\evenfootline={\hfil} -\global\oddfootline={\hfil} -\global\evenheadline={\line{\folio\hfil\thistitle}} -\global\oddheadline={\line{\thischapter\hfil\folio}} -\global\let\contentsalignmacro = \chapoddpage -} - -\def\HEADINGSsingleafter{\let\HEADINGShook=\HEADINGSsinglex} -\def\HEADINGSsinglex{% -\global\evenfootline={\hfil} -\global\oddfootline={\hfil} -\global\evenheadline={\line{\thischapter\hfil\folio}} -\global\oddheadline={\line{\thischapter\hfil\folio}} -\global\let\contentsalignmacro = \chappager -} - -% Subroutines used in generating headings -% This produces Day Month Year style of output. -% Only define if not already defined, in case a txi-??.tex file has set -% up a different format (e.g., txi-cs.tex does this). -\ifx\today\undefined -\def\today{% - \number\day\space - \ifcase\month - \or\putwordMJan\or\putwordMFeb\or\putwordMMar\or\putwordMApr - \or\putwordMMay\or\putwordMJun\or\putwordMJul\or\putwordMAug - \or\putwordMSep\or\putwordMOct\or\putwordMNov\or\putwordMDec - \fi - \space\number\year} -\fi - -% @settitle line... specifies the title of the document, for headings. -% It generates no output of its own. -\def\thistitle{\putwordNoTitle} -\def\settitle{\parsearg{\gdef\thistitle}} - - -\message{tables,} -% Tables -- @table, @ftable, @vtable, @item(x). - -% default indentation of table text -\newdimen\tableindent \tableindent=.8in -% default indentation of @itemize and @enumerate text -\newdimen\itemindent \itemindent=.3in -% margin between end of table item and start of table text. -\newdimen\itemmargin \itemmargin=.1in - -% used internally for \itemindent minus \itemmargin -\newdimen\itemmax - -% Note @table, @ftable, and @vtable define @item, @itemx, etc., with -% these defs. -% They also define \itemindex -% to index the item name in whatever manner is desired (perhaps none). - -\newif\ifitemxneedsnegativevskip - -\def\itemxpar{\par\ifitemxneedsnegativevskip\nobreak\vskip-\parskip\nobreak\fi} - -\def\internalBitem{\smallbreak \parsearg\itemzzz} -\def\internalBitemx{\itemxpar \parsearg\itemzzz} - -\def\itemzzz #1{\begingroup % - \advance\hsize by -\rightskip - \advance\hsize by -\tableindent - \setbox0=\hbox{\itemindicate{#1}}% - \itemindex{#1}% - \nobreak % This prevents a break before @itemx. - % - % If the item text does not fit in the space we have, put it on a line - % by itself, and do not allow a page break either before or after that - % line. We do not start a paragraph here because then if the next - % command is, e.g., @kindex, the whatsit would get put into the - % horizontal list on a line by itself, resulting in extra blank space. - \ifdim \wd0>\itemmax - % - % Make this a paragraph so we get the \parskip glue and wrapping, - % but leave it ragged-right. - \begingroup - \advance\leftskip by-\tableindent - \advance\hsize by\tableindent - \advance\rightskip by0pt plus1fil - \leavevmode\unhbox0\par - \endgroup - % - % We're going to be starting a paragraph, but we don't want the - % \parskip glue -- logically it's part of the @item we just started. - \nobreak \vskip-\parskip - % - % Stop a page break at the \parskip glue coming up. However, if - % what follows is an environment such as @example, there will be no - % \parskip glue; then the negative vskip we just inserted would - % cause the example and the item to crash together. So we use this - % bizarre value of 10001 as a signal to \aboveenvbreak to insert - % \parskip glue after all. Section titles are handled this way also. - % - \penalty 10001 - \endgroup - \itemxneedsnegativevskipfalse - \else - % The item text fits into the space. Start a paragraph, so that the - % following text (if any) will end up on the same line. - \noindent - % Do this with kerns and \unhbox so that if there is a footnote in - % the item text, it can migrate to the main vertical list and - % eventually be printed. - \nobreak\kern-\tableindent - \dimen0 = \itemmax \advance\dimen0 by \itemmargin \advance\dimen0 by -\wd0 - \unhbox0 - \nobreak\kern\dimen0 - \endgroup - \itemxneedsnegativevskiptrue - \fi -} - -\def\item{\errmessage{@item while not in a list environment}} -\def\itemx{\errmessage{@itemx while not in a list environment}} - -% @table, @ftable, @vtable. -\envdef\table{% - \let\itemindex\gobble - \tablecheck{table}% -} -\envdef\ftable{% - \def\itemindex ##1{\doind {fn}{\code{##1}}}% - \tablecheck{ftable}% -} -\envdef\vtable{% - \def\itemindex ##1{\doind {vr}{\code{##1}}}% - \tablecheck{vtable}% -} -\def\tablecheck#1{% - \ifnum \the\catcode`\^^M=\active - \endgroup - \errmessage{This command won't work in this context; perhaps the problem is - that we are \inenvironment\thisenv}% - \def\next{\doignore{#1}}% - \else - \let\next\tablex - \fi - \next -} -\def\tablex#1{% - \def\itemindicate{#1}% - \parsearg\tabley -} -\def\tabley#1{% - {% - \makevalueexpandable - \edef\temp{\noexpand\tablez #1\space\space\space}% - \expandafter - }\temp \endtablez -} -\def\tablez #1 #2 #3 #4\endtablez{% - \aboveenvbreak - \ifnum 0#1>0 \advance \leftskip by #1\mil \fi - \ifnum 0#2>0 \tableindent=#2\mil \fi - \ifnum 0#3>0 \advance \rightskip by #3\mil \fi - \itemmax=\tableindent - \advance \itemmax by -\itemmargin - \advance \leftskip by \tableindent - \exdentamount=\tableindent - \parindent = 0pt - \parskip = \smallskipamount - \ifdim \parskip=0pt \parskip=2pt \fi - \let\item = \internalBitem - \let\itemx = \internalBitemx -} -\def\Etable{\endgraf\afterenvbreak} -\let\Eftable\Etable -\let\Evtable\Etable -\let\Eitemize\Etable -\let\Eenumerate\Etable - -% This is the counter used by @enumerate, which is really @itemize - -\newcount \itemno - -\envdef\itemize{\parsearg\doitemize} - -\def\doitemize#1{% - \aboveenvbreak - \itemmax=\itemindent - \advance\itemmax by -\itemmargin - \advance\leftskip by \itemindent - \exdentamount=\itemindent - \parindent=0pt - \parskip=\smallskipamount - \ifdim\parskip=0pt \parskip=2pt \fi - \def\itemcontents{#1}% - % @itemize with no arg is equivalent to @itemize @bullet. - \ifx\itemcontents\empty\def\itemcontents{\bullet}\fi - \let\item=\itemizeitem -} - -% Definition of @item while inside @itemize and @enumerate. -% -\def\itemizeitem{% - \advance\itemno by 1 % for enumerations - {\let\par=\endgraf \smallbreak}% reasonable place to break - {% - % If the document has an @itemize directly after a section title, a - % \nobreak will be last on the list, and \sectionheading will have - % done a \vskip-\parskip. In that case, we don't want to zero - % parskip, or the item text will crash with the heading. On the - % other hand, when there is normal text preceding the item (as there - % usually is), we do want to zero parskip, or there would be too much - % space. In that case, we won't have a \nobreak before. At least - % that's the theory. - \ifnum\lastpenalty<10000 \parskip=0in \fi - \noindent - \hbox to 0pt{\hss \itemcontents \kern\itemmargin}% - \vadjust{\penalty 1200}}% not good to break after first line of item. - \flushcr -} - -% \splitoff TOKENS\endmark defines \first to be the first token in -% TOKENS, and \rest to be the remainder. -% -\def\splitoff#1#2\endmark{\def\first{#1}\def\rest{#2}}% - -% Allow an optional argument of an uppercase letter, lowercase letter, -% or number, to specify the first label in the enumerated list. No -% argument is the same as `1'. -% -\envparseargdef\enumerate{\enumeratey #1 \endenumeratey} -\def\enumeratey #1 #2\endenumeratey{% - % If we were given no argument, pretend we were given `1'. - \def\thearg{#1}% - \ifx\thearg\empty \def\thearg{1}\fi - % - % Detect if the argument is a single token. If so, it might be a - % letter. Otherwise, the only valid thing it can be is a number. - % (We will always have one token, because of the test we just made. - % This is a good thing, since \splitoff doesn't work given nothing at - % all -- the first parameter is undelimited.) - \expandafter\splitoff\thearg\endmark - \ifx\rest\empty - % Only one token in the argument. It could still be anything. - % A ``lowercase letter'' is one whose \lccode is nonzero. - % An ``uppercase letter'' is one whose \lccode is both nonzero, and - % not equal to itself. - % Otherwise, we assume it's a number. - % - % We need the \relax at the end of the \ifnum lines to stop TeX from - % continuing to look for a <number>. - % - \ifnum\lccode\expandafter`\thearg=0\relax - \numericenumerate % a number (we hope) - \else - % It's a letter. - \ifnum\lccode\expandafter`\thearg=\expandafter`\thearg\relax - \lowercaseenumerate % lowercase letter - \else - \uppercaseenumerate % uppercase letter - \fi - \fi - \else - % Multiple tokens in the argument. We hope it's a number. - \numericenumerate - \fi -} - -% An @enumerate whose labels are integers. The starting integer is -% given in \thearg. -% -\def\numericenumerate{% - \itemno = \thearg - \startenumeration{\the\itemno}% -} - -% The starting (lowercase) letter is in \thearg. -\def\lowercaseenumerate{% - \itemno = \expandafter`\thearg - \startenumeration{% - % Be sure we're not beyond the end of the alphabet. - \ifnum\itemno=0 - \errmessage{No more lowercase letters in @enumerate; get a bigger - alphabet}% - \fi - \char\lccode\itemno - }% -} - -% The starting (uppercase) letter is in \thearg. -\def\uppercaseenumerate{% - \itemno = \expandafter`\thearg - \startenumeration{% - % Be sure we're not beyond the end of the alphabet. - \ifnum\itemno=0 - \errmessage{No more uppercase letters in @enumerate; get a bigger - alphabet} - \fi - \char\uccode\itemno - }% -} - -% Call \doitemize, adding a period to the first argument and supplying the -% common last two arguments. Also subtract one from the initial value in -% \itemno, since @item increments \itemno. -% -\def\startenumeration#1{% - \advance\itemno by -1 - \doitemize{#1.}\flushcr -} - -% @alphaenumerate and @capsenumerate are abbreviations for giving an arg -% to @enumerate. -% -\def\alphaenumerate{\enumerate{a}} -\def\capsenumerate{\enumerate{A}} -\def\Ealphaenumerate{\Eenumerate} -\def\Ecapsenumerate{\Eenumerate} - - -% @multitable macros -% Amy Hendrickson, 8/18/94, 3/6/96 -% -% @multitable ... @end multitable will make as many columns as desired. -% Contents of each column will wrap at width given in preamble. Width -% can be specified either with sample text given in a template line, -% or in percent of \hsize, the current width of text on page. - -% Table can continue over pages but will only break between lines. - -% To make preamble: -% -% Either define widths of columns in terms of percent of \hsize: -% @multitable @columnfractions .25 .3 .45 -% @item ... -% -% Numbers following @columnfractions are the percent of the total -% current hsize to be used for each column. You may use as many -% columns as desired. - - -% Or use a template: -% @multitable {Column 1 template} {Column 2 template} {Column 3 template} -% @item ... -% using the widest term desired in each column. - -% Each new table line starts with @item, each subsequent new column -% starts with @tab. Empty columns may be produced by supplying @tab's -% with nothing between them for as many times as empty columns are needed, -% ie, @tab@tab@tab will produce two empty columns. - -% @item, @tab do not need to be on their own lines, but it will not hurt -% if they are. - -% Sample multitable: - -% @multitable {Column 1 template} {Column 2 template} {Column 3 template} -% @item first col stuff @tab second col stuff @tab third col -% @item -% first col stuff -% @tab -% second col stuff -% @tab -% third col -% @item first col stuff @tab second col stuff -% @tab Many paragraphs of text may be used in any column. -% -% They will wrap at the width determined by the template. -% @item@tab@tab This will be in third column. -% @end multitable - -% Default dimensions may be reset by user. -% @multitableparskip is vertical space between paragraphs in table. -% @multitableparindent is paragraph indent in table. -% @multitablecolmargin is horizontal space to be left between columns. -% @multitablelinespace is space to leave between table items, baseline -% to baseline. -% 0pt means it depends on current normal line spacing. -% -\newskip\multitableparskip -\newskip\multitableparindent -\newdimen\multitablecolspace -\newskip\multitablelinespace -\multitableparskip=0pt -\multitableparindent=6pt -\multitablecolspace=12pt -\multitablelinespace=0pt - -% Macros used to set up halign preamble: -% -\let\endsetuptable\relax -\def\xendsetuptable{\endsetuptable} -\let\columnfractions\relax -\def\xcolumnfractions{\columnfractions} -\newif\ifsetpercent - -% #1 is the @columnfraction, usually a decimal number like .5, but might -% be just 1. We just use it, whatever it is. -% -\def\pickupwholefraction#1 {% - \global\advance\colcount by 1 - \expandafter\xdef\csname col\the\colcount\endcsname{#1\hsize}% - \setuptable -} - -\newcount\colcount -\def\setuptable#1{% - \def\firstarg{#1}% - \ifx\firstarg\xendsetuptable - \let\go = \relax - \else - \ifx\firstarg\xcolumnfractions - \global\setpercenttrue - \else - \ifsetpercent - \let\go\pickupwholefraction - \else - \global\advance\colcount by 1 - \setbox0=\hbox{#1\unskip\space}% Add a normal word space as a - % separator; typically that is always in the input, anyway. - \expandafter\xdef\csname col\the\colcount\endcsname{\the\wd0}% - \fi - \fi - \ifx\go\pickupwholefraction - % Put the argument back for the \pickupwholefraction call, so - % we'll always have a period there to be parsed. - \def\go{\pickupwholefraction#1}% - \else - \let\go = \setuptable - \fi% - \fi - \go -} - -% multitable-only commands. -% -% @headitem starts a heading row, which we typeset in bold. -% Assignments have to be global since we are inside the implicit group -% of an alignment entry. Note that \everycr resets \everytab. -\def\headitem{\checkenv\multitable \crcr \global\everytab={\bf}\the\everytab}% -% -% A \tab used to include \hskip1sp. But then the space in a template -% line is not enough. That is bad. So let's go back to just `&' until -% we encounter the problem it was intended to solve again. -% --karl, nathan@acm.org, 20apr99. -\def\tab{\checkenv\multitable &\the\everytab}% - -% @multitable ... @end multitable definitions: -% -\newtoks\everytab % insert after every tab. -% -\envdef\multitable{% - \vskip\parskip - \startsavinginserts - % - % @item within a multitable starts a normal row. - % We use \def instead of \let so that if one of the multitable entries - % contains an @itemize, we don't choke on the \item (seen as \crcr aka - % \endtemplate) expanding \doitemize. - \def\item{\crcr}% - % - \tolerance=9500 - \hbadness=9500 - \setmultitablespacing - \parskip=\multitableparskip - \parindent=\multitableparindent - \overfullrule=0pt - \global\colcount=0 - % - \everycr = {% - \noalign{% - \global\everytab={}% - \global\colcount=0 % Reset the column counter. - % Check for saved footnotes, etc. - \checkinserts - % Keeps underfull box messages off when table breaks over pages. - %\filbreak - % Maybe so, but it also creates really weird page breaks when the - % table breaks over pages. Wouldn't \vfil be better? Wait until the - % problem manifests itself, so it can be fixed for real --karl. - }% - }% - % - \parsearg\domultitable -} -\def\domultitable#1{% - % To parse everything between @multitable and @item: - \setuptable#1 \endsetuptable - % - % This preamble sets up a generic column definition, which will - % be used as many times as user calls for columns. - % \vtop will set a single line and will also let text wrap and - % continue for many paragraphs if desired. - \halign\bgroup &% - \global\advance\colcount by 1 - \multistrut - \vtop{% - % Use the current \colcount to find the correct column width: - \hsize=\expandafter\csname col\the\colcount\endcsname - % - % In order to keep entries from bumping into each other - % we will add a \leftskip of \multitablecolspace to all columns after - % the first one. - % - % If a template has been used, we will add \multitablecolspace - % to the width of each template entry. - % - % If the user has set preamble in terms of percent of \hsize we will - % use that dimension as the width of the column, and the \leftskip - % will keep entries from bumping into each other. Table will start at - % left margin and final column will justify at right margin. - % - % Make sure we don't inherit \rightskip from the outer environment. - \rightskip=0pt - \ifnum\colcount=1 - % The first column will be indented with the surrounding text. - \advance\hsize by\leftskip - \else - \ifsetpercent \else - % If user has not set preamble in terms of percent of \hsize - % we will advance \hsize by \multitablecolspace. - \advance\hsize by \multitablecolspace - \fi - % In either case we will make \leftskip=\multitablecolspace: - \leftskip=\multitablecolspace - \fi - % Ignoring space at the beginning and end avoids an occasional spurious - % blank line, when TeX decides to break the line at the space before the - % box from the multistrut, so the strut ends up on a line by itself. - % For example: - % @multitable @columnfractions .11 .89 - % @item @code{#} - % @tab Legal holiday which is valid in major parts of the whole country. - % Is automatically provided with highlighting sequences respectively - % marking characters. - \noindent\ignorespaces##\unskip\multistrut - }\cr -} -\def\Emultitable{% - \crcr - \egroup % end the \halign - \global\setpercentfalse -} - -\def\setmultitablespacing{% - \def\multistrut{\strut}% just use the standard line spacing - % - % Compute \multitablelinespace (if not defined by user) for use in - % \multitableparskip calculation. We used define \multistrut based on - % this, but (ironically) that caused the spacing to be off. - % See bug-texinfo report from Werner Lemberg, 31 Oct 2004 12:52:20 +0100. -\ifdim\multitablelinespace=0pt -\setbox0=\vbox{X}\global\multitablelinespace=\the\baselineskip -\global\advance\multitablelinespace by-\ht0 -\fi -%% Test to see if parskip is larger than space between lines of -%% table. If not, do nothing. -%% If so, set to same dimension as multitablelinespace. -\ifdim\multitableparskip>\multitablelinespace -\global\multitableparskip=\multitablelinespace -\global\advance\multitableparskip-7pt %% to keep parskip somewhat smaller - %% than skip between lines in the table. -\fi% -\ifdim\multitableparskip=0pt -\global\multitableparskip=\multitablelinespace -\global\advance\multitableparskip-7pt %% to keep parskip somewhat smaller - %% than skip between lines in the table. -\fi} - - -\message{conditionals,} - -% @iftex, @ifnotdocbook, @ifnothtml, @ifnotinfo, @ifnotplaintext, -% @ifnotxml always succeed. They currently do nothing; we don't -% attempt to check whether the conditionals are properly nested. But we -% have to remember that they are conditionals, so that @end doesn't -% attempt to close an environment group. -% -\def\makecond#1{% - \expandafter\let\csname #1\endcsname = \relax - \expandafter\let\csname iscond.#1\endcsname = 1 -} -\makecond{iftex} -\makecond{ifnotdocbook} -\makecond{ifnothtml} -\makecond{ifnotinfo} -\makecond{ifnotplaintext} -\makecond{ifnotxml} - -% Ignore @ignore, @ifhtml, @ifinfo, and the like. -% -\def\direntry{\doignore{direntry}} -\def\documentdescription{\doignore{documentdescription}} -\def\docbook{\doignore{docbook}} -\def\html{\doignore{html}} -\def\ifdocbook{\doignore{ifdocbook}} -\def\ifhtml{\doignore{ifhtml}} -\def\ifinfo{\doignore{ifinfo}} -\def\ifnottex{\doignore{ifnottex}} -\def\ifplaintext{\doignore{ifplaintext}} -\def\ifxml{\doignore{ifxml}} -\def\ignore{\doignore{ignore}} -\def\menu{\doignore{menu}} -\def\xml{\doignore{xml}} - -% Ignore text until a line `@end #1', keeping track of nested conditionals. -% -% A count to remember the depth of nesting. -\newcount\doignorecount - -\def\doignore#1{\begingroup - % Scan in ``verbatim'' mode: - \catcode`\@ = \other - \catcode`\{ = \other - \catcode`\} = \other - % - % Make sure that spaces turn into tokens that match what \doignoretext wants. - \spaceisspace - % - % Count number of #1's that we've seen. - \doignorecount = 0 - % - % Swallow text until we reach the matching `@end #1'. - \dodoignore{#1}% -} - -{ \catcode`_=11 % We want to use \_STOP_ which cannot appear in texinfo source. - \obeylines % - % - \gdef\dodoignore#1{% - % #1 contains the command name as a string, e.g., `ifinfo'. - % - % Define a command to find the next `@end #1', which must be on a line - % by itself. - \long\def\doignoretext##1^^M@end #1{\doignoretextyyy##1^^M@#1\_STOP_}% - % And this command to find another #1 command, at the beginning of a - % line. (Otherwise, we would consider a line `@c @ifset', for - % example, to count as an @ifset for nesting.) - \long\def\doignoretextyyy##1^^M@#1##2\_STOP_{\doignoreyyy{##2}\_STOP_}% - % - % And now expand that command. - \obeylines % - \doignoretext ^^M% - }% -} - -\def\doignoreyyy#1{% - \def\temp{#1}% - \ifx\temp\empty % Nothing found. - \let\next\doignoretextzzz - \else % Found a nested condition, ... - \advance\doignorecount by 1 - \let\next\doignoretextyyy % ..., look for another. - % If we're here, #1 ends with ^^M\ifinfo (for example). - \fi - \next #1% the token \_STOP_ is present just after this macro. -} - -% We have to swallow the remaining "\_STOP_". -% -\def\doignoretextzzz#1{% - \ifnum\doignorecount = 0 % We have just found the outermost @end. - \let\next\enddoignore - \else % Still inside a nested condition. - \advance\doignorecount by -1 - \let\next\doignoretext % Look for the next @end. - \fi - \next -} - -% Finish off ignored text. -\def\enddoignore{\endgroup\ignorespaces} - - -% @set VAR sets the variable VAR to an empty value. -% @set VAR REST-OF-LINE sets VAR to the value REST-OF-LINE. -% -% Since we want to separate VAR from REST-OF-LINE (which might be -% empty), we can't just use \parsearg; we have to insert a space of our -% own to delimit the rest of the line, and then take it out again if we -% didn't need it. -% We rely on the fact that \parsearg sets \catcode`\ =10. -% -\parseargdef\set{\setyyy#1 \endsetyyy} -\def\setyyy#1 #2\endsetyyy{% - {% - \makevalueexpandable - \def\temp{#2}% - \edef\next{\gdef\makecsname{SET#1}}% - \ifx\temp\empty - \next{}% - \else - \setzzz#2\endsetzzz - \fi - }% -} -% Remove the trailing space \setxxx inserted. -\def\setzzz#1 \endsetzzz{\next{#1}} - -% @clear VAR clears (i.e., unsets) the variable VAR. -% -\parseargdef\clear{% - {% - \makevalueexpandable - \global\expandafter\let\csname SET#1\endcsname=\relax - }% -} - -% @value{foo} gets the text saved in variable foo. -\def\value{\begingroup\makevalueexpandable\valuexxx} -\def\valuexxx#1{\expandablevalue{#1}\endgroup} -{ - \catcode`\- = \active \catcode`\_ = \active - % - \gdef\makevalueexpandable{% - \let\value = \expandablevalue - % We don't want these characters active, ... - \catcode`\-=\other \catcode`\_=\other - % ..., but we might end up with active ones in the argument if - % we're called from @code, as @code{@value{foo-bar_}}, though. - % So \let them to their normal equivalents. - \let-\realdash \let_\normalunderscore - } -} - -% We have this subroutine so that we can handle at least some @value's -% properly in indexes (we call \makevalueexpandable in \indexdummies). -% The command has to be fully expandable (if the variable is set), since -% the result winds up in the index file. This means that if the -% variable's value contains other Texinfo commands, it's almost certain -% it will fail (although perhaps we could fix that with sufficient work -% to do a one-level expansion on the result, instead of complete). -% -\def\expandablevalue#1{% - \expandafter\ifx\csname SET#1\endcsname\relax - {[No value for ``#1'']}% - \message{Variable `#1', used in @value, is not set.}% - \else - \csname SET#1\endcsname - \fi -} - -% @ifset VAR ... @end ifset reads the `...' iff VAR has been defined -% with @set. -% -% To get special treatment of `@end ifset,' call \makeond and the redefine. -% -\makecond{ifset} -\def\ifset{\parsearg{\doifset{\let\next=\ifsetfail}}} -\def\doifset#1#2{% - {% - \makevalueexpandable - \let\next=\empty - \expandafter\ifx\csname SET#2\endcsname\relax - #1% If not set, redefine \next. - \fi - \expandafter - }\next -} -\def\ifsetfail{\doignore{ifset}} - -% @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been -% defined with @set, or has been undefined with @clear. -% -% The `\else' inside the `\doifset' parameter is a trick to reuse the -% above code: if the variable is not set, do nothing, if it is set, -% then redefine \next to \ifclearfail. -% -\makecond{ifclear} -\def\ifclear{\parsearg{\doifset{\else \let\next=\ifclearfail}}} -\def\ifclearfail{\doignore{ifclear}} - -% @dircategory CATEGORY -- specify a category of the dir file -% which this file should belong to. Ignore this in TeX. -\let\dircategory=\comment - -% @defininfoenclose. -\let\definfoenclose=\comment - - -\message{indexing,} -% Index generation facilities - -% Define \newwrite to be identical to plain tex's \newwrite -% except not \outer, so it can be used within macros and \if's. -\edef\newwrite{\makecsname{ptexnewwrite}} - -% \newindex {foo} defines an index named foo. -% It automatically defines \fooindex such that -% \fooindex ...rest of line... puts an entry in the index foo. -% It also defines \fooindfile to be the number of the output channel for -% the file that accumulates this index. The file's extension is foo. -% The name of an index should be no more than 2 characters long -% for the sake of vms. -% -\def\newindex#1{% - \iflinks - \expandafter\newwrite \csname#1indfile\endcsname - \openout \csname#1indfile\endcsname \jobname.#1 % Open the file - \fi - \expandafter\xdef\csname#1index\endcsname{% % Define @#1index - \noexpand\doindex{#1}} -} - -% @defindex foo == \newindex{foo} -% -\def\defindex{\parsearg\newindex} - -% Define @defcodeindex, like @defindex except put all entries in @code. -% -\def\defcodeindex{\parsearg\newcodeindex} -% -\def\newcodeindex#1{% - \iflinks - \expandafter\newwrite \csname#1indfile\endcsname - \openout \csname#1indfile\endcsname \jobname.#1 - \fi - \expandafter\xdef\csname#1index\endcsname{% - \noexpand\docodeindex{#1}}% -} - - -% @synindex foo bar makes index foo feed into index bar. -% Do this instead of @defindex foo if you don't want it as a separate index. -% -% @syncodeindex foo bar similar, but put all entries made for index foo -% inside @code. -% -\def\synindex#1 #2 {\dosynindex\doindex{#1}{#2}} -\def\syncodeindex#1 #2 {\dosynindex\docodeindex{#1}{#2}} - -% #1 is \doindex or \docodeindex, #2 the index getting redefined (foo), -% #3 the target index (bar). -\def\dosynindex#1#2#3{% - % Only do \closeout if we haven't already done it, else we'll end up - % closing the target index. - \expandafter \ifx\csname donesynindex#2\endcsname \undefined - % The \closeout helps reduce unnecessary open files; the limit on the - % Acorn RISC OS is a mere 16 files. - \expandafter\closeout\csname#2indfile\endcsname - \expandafter\let\csname\donesynindex#2\endcsname = 1 - \fi - % redefine \fooindfile: - \expandafter\let\expandafter\temp\expandafter=\csname#3indfile\endcsname - \expandafter\let\csname#2indfile\endcsname=\temp - % redefine \fooindex: - \expandafter\xdef\csname#2index\endcsname{\noexpand#1{#3}}% -} - -% Define \doindex, the driver for all \fooindex macros. -% Argument #1 is generated by the calling \fooindex macro, -% and it is "foo", the name of the index. - -% \doindex just uses \parsearg; it calls \doind for the actual work. -% This is because \doind is more useful to call from other macros. - -% There is also \dosubind {index}{topic}{subtopic} -% which makes an entry in a two-level index such as the operation index. - -\def\doindex#1{\edef\indexname{#1}\parsearg\singleindexer} -\def\singleindexer #1{\doind{\indexname}{#1}} - -% like the previous two, but they put @code around the argument. -\def\docodeindex#1{\edef\indexname{#1}\parsearg\singlecodeindexer} -\def\singlecodeindexer #1{\doind{\indexname}{\code{#1}}} - -% Take care of Texinfo commands that can appear in an index entry. -% Since there are some commands we want to expand, and others we don't, -% we have to laboriously prevent expansion for those that we don't. -% -\def\indexdummies{% - \escapechar = `\\ % use backslash in output files. - \def\@{@}% change to @@ when we switch to @ as escape char in index files. - \def\ {\realbackslash\space }% - % Need these in case \tex is in effect and \{ is a \delimiter again. - % But can't use \lbracecmd and \rbracecmd because texindex assumes - % braces and backslashes are used only as delimiters. - \let\{ = \mylbrace - \let\} = \myrbrace - % - % Do the redefinitions. - \commondummies -} - -% For the aux and toc files, @ is the escape character. So we want to -% redefine everything using @ as the escape character (instead of -% \realbackslash, still used for index files). When everything uses @, -% this will be simpler. -% -\def\atdummies{% - \def\@{@@}% - \def\ {@ }% - \let\{ = \lbraceatcmd - \let\} = \rbraceatcmd - % - % Do the redefinitions. - \commondummies -} - -% Called from \indexdummies and \atdummies. -% -\def\commondummies{% - % - % \definedummyword defines \#1 as \string\#1\space, thus effectively - % preventing its expansion. This is used only for control% words, - % not control letters, because the \space would be incorrect for - % control characters, but is needed to separate the control word - % from whatever follows. - % - % For control letters, we have \definedummyletter, which omits the - % space. - % - % These can be used both for control words that take an argument and - % those that do not. If it is followed by {arg} in the input, then - % that will dutifully get written to the index (or wherever). - % - \def\definedummyword ##1{\def##1{\string##1\space}}% - \def\definedummyletter##1{\def##1{\string##1}}% - \let\definedummyaccent\definedummyletter - % - \commondummiesnofonts - % - \definedummyletter\_% - % - % Non-English letters. - \definedummyword\AA - \definedummyword\AE - \definedummyword\L - \definedummyword\OE - \definedummyword\O - \definedummyword\aa - \definedummyword\ae - \definedummyword\l - \definedummyword\oe - \definedummyword\o - \definedummyword\ss - \definedummyword\exclamdown - \definedummyword\questiondown - \definedummyword\ordf - \definedummyword\ordm - % - % Although these internal commands shouldn't show up, sometimes they do. - \definedummyword\bf - \definedummyword\gtr - \definedummyword\hat - \definedummyword\less - \definedummyword\sf - \definedummyword\sl - \definedummyword\tclose - \definedummyword\tt - % - \definedummyword\LaTeX - \definedummyword\TeX - % - % Assorted special characters. - \definedummyword\bullet - \definedummyword\comma - \definedummyword\copyright - \definedummyword\registeredsymbol - \definedummyword\dots - \definedummyword\enddots - \definedummyword\equiv - \definedummyword\error - \definedummyword\euro - \definedummyword\expansion - \definedummyword\minus - \definedummyword\pounds - \definedummyword\point - \definedummyword\print - \definedummyword\result - % - % We want to disable all macros so that they are not expanded by \write. - \macrolist - % - \normalturnoffactive - % - % Handle some cases of @value -- where it does not contain any - % (non-fully-expandable) commands. - \makevalueexpandable -} - -% \commondummiesnofonts: common to \commondummies and \indexnofonts. -% -% Better have this without active chars. -{ - \catcode`\~=\other - \gdef\commondummiesnofonts{% - % Control letters and accents. - \definedummyletter\!% - \definedummyaccent\"% - \definedummyaccent\'% - \definedummyletter\*% - \definedummyaccent\,% - \definedummyletter\.% - \definedummyletter\/% - \definedummyletter\:% - \definedummyaccent\=% - \definedummyletter\?% - \definedummyaccent\^% - \definedummyaccent\`% - \definedummyaccent\~% - \definedummyword\u - \definedummyword\v - \definedummyword\H - \definedummyword\dotaccent - \definedummyword\ringaccent - \definedummyword\tieaccent - \definedummyword\ubaraccent - \definedummyword\udotaccent - \definedummyword\dotless - % - % Texinfo font commands. - \definedummyword\b - \definedummyword\i - \definedummyword\r - \definedummyword\sc - \definedummyword\t - % - % Commands that take arguments. - \definedummyword\acronym - \definedummyword\cite - \definedummyword\code - \definedummyword\command - \definedummyword\dfn - \definedummyword\emph - \definedummyword\env - \definedummyword\file - \definedummyword\kbd - \definedummyword\key - \definedummyword\math - \definedummyword\option - \definedummyword\samp - \definedummyword\strong - \definedummyword\tie - \definedummyword\uref - \definedummyword\url - \definedummyword\var - \definedummyword\verb - \definedummyword\w - } -} - -% \indexnofonts is used when outputting the strings to sort the index -% by, and when constructing control sequence names. It eliminates all -% control sequences and just writes whatever the best ASCII sort string -% would be for a given command (usually its argument). -% -\def\indexnofonts{% - % Accent commands should become @asis. - \def\definedummyaccent##1{\let##1\asis}% - % We can just ignore other control letters. - \def\definedummyletter##1{\let##1\empty}% - % Hopefully, all control words can become @asis. - \let\definedummyword\definedummyaccent - % - \commondummiesnofonts - % - % Don't no-op \tt, since it isn't a user-level command - % and is used in the definitions of the active chars like <, >, |, etc. - % Likewise with the other plain tex font commands. - %\let\tt=\asis - % - \def\ { }% - \def\@{@}% - % how to handle braces? - \def\_{\normalunderscore}% - % - % Non-English letters. - \def\AA{AA}% - \def\AE{AE}% - \def\L{L}% - \def\OE{OE}% - \def\O{O}% - \def\aa{aa}% - \def\ae{ae}% - \def\l{l}% - \def\oe{oe}% - \def\o{o}% - \def\ss{ss}% - \def\exclamdown{!}% - \def\questiondown{?}% - \def\ordf{a}% - \def\ordm{o}% - % - \def\LaTeX{LaTeX}% - \def\TeX{TeX}% - % - % Assorted special characters. - % (The following {} will end up in the sort string, but that's ok.) - \def\bullet{bullet}% - \def\comma{,}% - \def\copyright{copyright}% - \def\registeredsymbol{R}% - \def\dots{...}% - \def\enddots{...}% - \def\equiv{==}% - \def\error{error}% - \def\euro{euro}% - \def\expansion{==>}% - \def\minus{-}% - \def\pounds{pounds}% - \def\point{.}% - \def\print{-|}% - \def\result{=>}% - % - % We need to get rid of all macros, leaving only the arguments (if present). - % Of course this is not nearly correct, but it is the best we can do for now. - % makeinfo does not expand macros in the argument to @deffn, which ends up - % writing an index entry, and texindex isn't prepared for an index sort entry - % that starts with \. - % - % Since macro invocations are followed by braces, we can just redefine them - % to take a single TeX argument. The case of a macro invocation that - % goes to end-of-line is not handled. - % - \macrolist -} - -\let\indexbackslash=0 %overridden during \printindex. -\let\SETmarginindex=\relax % put index entries in margin (undocumented)? - -% Most index entries go through here, but \dosubind is the general case. -% #1 is the index name, #2 is the entry text. -\def\doind#1#2{\dosubind{#1}{#2}{}} - -% Workhorse for all \fooindexes. -% #1 is name of index, #2 is stuff to put there, #3 is subentry -- -% empty if called from \doind, as we usually are (the main exception -% is with most defuns, which call us directly). -% -\def\dosubind#1#2#3{% - \iflinks - {% - % Store the main index entry text (including the third arg). - \toks0 = {#2}% - % If third arg is present, precede it with a space. - \def\thirdarg{#3}% - \ifx\thirdarg\empty \else - \toks0 = \expandafter{\the\toks0 \space #3}% - \fi - % - \edef\writeto{\csname#1indfile\endcsname}% - % - \ifvmode - \dosubindsanitize - \else - \dosubindwrite - \fi - }% - \fi -} - -% Write the entry in \toks0 to the index file: -% -\def\dosubindwrite{% - % Put the index entry in the margin if desired. - \ifx\SETmarginindex\relax\else - \insert\margin{\hbox{\vrule height8pt depth3pt width0pt \the\toks0}}% - \fi - % - % Remember, we are within a group. - \indexdummies % Must do this here, since \bf, etc expand at this stage - \def\backslashcurfont{\indexbackslash}% \indexbackslash isn't defined now - % so it will be output as is; and it will print as backslash. - % - % Process the index entry with all font commands turned off, to - % get the string to sort by. - {\indexnofonts - \edef\temp{\the\toks0}% need full expansion - \xdef\indexsorttmp{\temp}% - }% - % - % Set up the complete index entry, with both the sort key and - % the original text, including any font commands. We write - % three arguments to \entry to the .?? file (four in the - % subentry case), texindex reduces to two when writing the .??s - % sorted result. - \edef\temp{% - \write\writeto{% - \string\entry{\indexsorttmp}{\noexpand\folio}{\the\toks0}}% - }% - \temp -} - -% Take care of unwanted page breaks: -% -% If a skip is the last thing on the list now, preserve it -% by backing up by \lastskip, doing the \write, then inserting -% the skip again. Otherwise, the whatsit generated by the -% \write will make \lastskip zero. The result is that sequences -% like this: -% @end defun -% @tindex whatever -% @defun ... -% will have extra space inserted, because the \medbreak in the -% start of the @defun won't see the skip inserted by the @end of -% the previous defun. -% -% But don't do any of this if we're not in vertical mode. We -% don't want to do a \vskip and prematurely end a paragraph. -% -% Avoid page breaks due to these extra skips, too. -% -% But wait, there is a catch there: -% We'll have to check whether \lastskip is zero skip. \ifdim is not -% sufficient for this purpose, as it ignores stretch and shrink parts -% of the skip. The only way seems to be to check the textual -% representation of the skip. -% -% The following is almost like \def\zeroskipmacro{0.0pt} except that -% the ``p'' and ``t'' characters have catcode \other, not 11 (letter). -% -\edef\zeroskipmacro{\expandafter\the\csname z@skip\endcsname} -% -% ..., ready, GO: -% -\def\dosubindsanitize{% - % \lastskip and \lastpenalty cannot both be nonzero simultaneously. - \skip0 = \lastskip - \edef\lastskipmacro{\the\lastskip}% - \count255 = \lastpenalty - % - % If \lastskip is nonzero, that means the last item was a - % skip. And since a skip is discardable, that means this - % -\skip0 glue we're inserting is preceded by a - % non-discardable item, therefore it is not a potential - % breakpoint, therefore no \nobreak needed. - \ifx\lastskipmacro\zeroskipmacro - \else - \vskip-\skip0 - \fi - % - \dosubindwrite - % - \ifx\lastskipmacro\zeroskipmacro - % If \lastskip was zero, perhaps the last item was a penalty, and - % perhaps it was >=10000, e.g., a \nobreak. In that case, we want - % to re-insert the same penalty (values >10000 are used for various - % signals); since we just inserted a non-discardable item, any - % following glue (such as a \parskip) would be a breakpoint. For example: - % - % @deffn deffn-whatever - % @vindex index-whatever - % Description. - % would allow a break between the index-whatever whatsit - % and the "Description." paragraph. - \ifnum\count255>9999 \penalty\count255 \fi - \else - % On the other hand, if we had a nonzero \lastskip, - % this make-up glue would be preceded by a non-discardable item - % (the whatsit from the \write), so we must insert a \nobreak. - \nobreak\vskip\skip0 - \fi -} - -% The index entry written in the file actually looks like -% \entry {sortstring}{page}{topic} -% or -% \entry {sortstring}{page}{topic}{subtopic} -% The texindex program reads in these files and writes files -% containing these kinds of lines: -% \initial {c} -% before the first topic whose initial is c -% \entry {topic}{pagelist} -% for a topic that is used without subtopics -% \primary {topic} -% for the beginning of a topic that is used with subtopics -% \secondary {subtopic}{pagelist} -% for each subtopic. - -% Define the user-accessible indexing commands -% @findex, @vindex, @kindex, @cindex. - -\def\findex {\fnindex} -\def\kindex {\kyindex} -\def\cindex {\cpindex} -\def\vindex {\vrindex} -\def\tindex {\tpindex} -\def\pindex {\pgindex} - -\def\cindexsub {\begingroup\obeylines\cindexsub} -{\obeylines % -\gdef\cindexsub "#1" #2^^M{\endgroup % -\dosubind{cp}{#2}{#1}}} - -% Define the macros used in formatting output of the sorted index material. - -% @printindex causes a particular index (the ??s file) to get printed. -% It does not print any chapter heading (usually an @unnumbered). -% -\parseargdef\printindex{\begingroup - \dobreak \chapheadingskip{10000}% - % - \smallfonts \rm - \tolerance = 9500 - \everypar = {}% don't want the \kern\-parindent from indentation suppression. - % - % See if the index file exists and is nonempty. - % Change catcode of @ here so that if the index file contains - % \initial {@} - % as its first line, TeX doesn't complain about mismatched braces - % (because it thinks @} is a control sequence). - \catcode`\@ = 11 - \openin 1 \jobname.#1s - \ifeof 1 - % \enddoublecolumns gets confused if there is no text in the index, - % and it loses the chapter title and the aux file entries for the - % index. The easiest way to prevent this problem is to make sure - % there is some text. - \putwordIndexNonexistent - \else - % - % If the index file exists but is empty, then \openin leaves \ifeof - % false. We have to make TeX try to read something from the file, so - % it can discover if there is anything in it. - \read 1 to \temp - \ifeof 1 - \putwordIndexIsEmpty - \else - % Index files are almost Texinfo source, but we use \ as the escape - % character. It would be better to use @, but that's too big a change - % to make right now. - \def\indexbackslash{\backslashcurfont}% - \catcode`\\ = 0 - \escapechar = `\\ - \begindoublecolumns - \input \jobname.#1s - \enddoublecolumns - \fi - \fi - \closein 1 -\endgroup} - -% These macros are used by the sorted index file itself. -% Change them to control the appearance of the index. - -\def\initial#1{{% - % Some minor font changes for the special characters. - \let\tentt=\sectt \let\tt=\sectt \let\sf=\sectt - % - % Remove any glue we may have, we'll be inserting our own. - \removelastskip - % - % We like breaks before the index initials, so insert a bonus. - \nobreak - \vskip 0pt plus 3\baselineskip - \penalty 0 - \vskip 0pt plus -3\baselineskip - % - % Typeset the initial. Making this add up to a whole number of - % baselineskips increases the chance of the dots lining up from column - % to column. It still won't often be perfect, because of the stretch - % we need before each entry, but it's better. - % - % No shrink because it confuses \balancecolumns. - \vskip 1.67\baselineskip plus .5\baselineskip - \leftline{\secbf #1}% - % Do our best not to break after the initial. - \nobreak - \vskip .33\baselineskip plus .1\baselineskip -}} - -% \entry typesets a paragraph consisting of the text (#1), dot leaders, and -% then page number (#2) flushed to the right margin. It is used for index -% and table of contents entries. The paragraph is indented by \leftskip. -% -% A straightforward implementation would start like this: -% \def\entry#1#2{... -% But this frozes the catcodes in the argument, and can cause problems to -% @code, which sets - active. This problem was fixed by a kludge--- -% ``-'' was active throughout whole index, but this isn't really right. -% -% The right solution is to prevent \entry from swallowing the whole text. -% --kasal, 21nov03 -\def\entry{% - \begingroup - % - % Start a new paragraph if necessary, so our assignments below can't - % affect previous text. - \par - % - % Do not fill out the last line with white space. - \parfillskip = 0in - % - % No extra space above this paragraph. - \parskip = 0in - % - % Do not prefer a separate line ending with a hyphen to fewer lines. - \finalhyphendemerits = 0 - % - % \hangindent is only relevant when the entry text and page number - % don't both fit on one line. In that case, bob suggests starting the - % dots pretty far over on the line. Unfortunately, a large - % indentation looks wrong when the entry text itself is broken across - % lines. So we use a small indentation and put up with long leaders. - % - % \hangafter is reset to 1 (which is the value we want) at the start - % of each paragraph, so we need not do anything with that. - \hangindent = 2em - % - % When the entry text needs to be broken, just fill out the first line - % with blank space. - \rightskip = 0pt plus1fil - % - % A bit of stretch before each entry for the benefit of balancing - % columns. - \vskip 0pt plus1pt - % - % Swallow the left brace of the text (first parameter): - \afterassignment\doentry - \let\temp = -} -\def\doentry{% - \bgroup % Instead of the swallowed brace. - \noindent - \aftergroup\finishentry - % And now comes the text of the entry. -} -\def\finishentry#1{% - % #1 is the page number. - % - % The following is kludged to not output a line of dots in the index if - % there are no page numbers. The next person who breaks this will be - % cursed by a Unix daemon. - \def\tempa{{\rm }}% - \def\tempb{#1}% - \edef\tempc{\tempa}% - \edef\tempd{\tempb}% - \ifx\tempc\tempd - \ % - \else - % - % If we must, put the page number on a line of its own, and fill out - % this line with blank space. (The \hfil is overwhelmed with the - % fill leaders glue in \indexdotfill if the page number does fit.) - \hfil\penalty50 - \null\nobreak\indexdotfill % Have leaders before the page number. - % - % The `\ ' here is removed by the implicit \unskip that TeX does as - % part of (the primitive) \par. Without it, a spurious underfull - % \hbox ensues. - \ifpdf - \pdfgettoks#1.% - \ \the\toksA - \else - \ #1% - \fi - \fi - \par - \endgroup -} - -% Like \dotfill except takes at least 1 em. -\def\indexdotfill{\cleaders - \hbox{$\mathsurround=0pt \mkern1.5mu ${\it .}$ \mkern1.5mu$}\hskip 1em plus 1fill} - -\def\primary #1{\line{#1\hfil}} - -\newskip\secondaryindent \secondaryindent=0.5cm -\def\secondary#1#2{{% - \parfillskip=0in - \parskip=0in - \hangindent=1in - \hangafter=1 - \noindent\hskip\secondaryindent\hbox{#1}\indexdotfill - \ifpdf - \pdfgettoks#2.\ \the\toksA % The page number ends the paragraph. - \else - #2 - \fi - \par -}} - -% Define two-column mode, which we use to typeset indexes. -% Adapted from the TeXbook, page 416, which is to say, -% the manmac.tex format used to print the TeXbook itself. -\catcode`\@=11 - -\newbox\partialpage -\newdimen\doublecolumnhsize - -\def\begindoublecolumns{\begingroup % ended by \enddoublecolumns - % Grab any single-column material above us. - \output = {% - % - % Here is a possibility not foreseen in manmac: if we accumulate a - % whole lot of material, we might end up calling this \output - % routine twice in a row (see the doublecol-lose test, which is - % essentially a couple of indexes with @setchapternewpage off). In - % that case we just ship out what is in \partialpage with the normal - % output routine. Generally, \partialpage will be empty when this - % runs and this will be a no-op. See the indexspread.tex test case. - \ifvoid\partialpage \else - \onepageout{\pagecontents\partialpage}% - \fi - % - \global\setbox\partialpage = \vbox{% - % Unvbox the main output page. - \unvbox\PAGE - \kern-\topskip \kern\baselineskip - }% - }% - \eject % run that output routine to set \partialpage - % - % Use the double-column output routine for subsequent pages. - \output = {\doublecolumnout}% - % - % Change the page size parameters. We could do this once outside this - % routine, in each of @smallbook, @afourpaper, and the default 8.5x11 - % format, but then we repeat the same computation. Repeating a couple - % of assignments once per index is clearly meaningless for the - % execution time, so we may as well do it in one place. - % - % First we halve the line length, less a little for the gutter between - % the columns. We compute the gutter based on the line length, so it - % changes automatically with the paper format. The magic constant - % below is chosen so that the gutter has the same value (well, +-<1pt) - % as it did when we hard-coded it. - % - % We put the result in a separate register, \doublecolumhsize, so we - % can restore it in \pagesofar, after \hsize itself has (potentially) - % been clobbered. - % - \doublecolumnhsize = \hsize - \advance\doublecolumnhsize by -.04154\hsize - \divide\doublecolumnhsize by 2 - \hsize = \doublecolumnhsize - % - % Double the \vsize as well. (We don't need a separate register here, - % since nobody clobbers \vsize.) - \vsize = 2\vsize -} - -% The double-column output routine for all double-column pages except -% the last. -% -\def\doublecolumnout{% - \splittopskip=\topskip \splitmaxdepth=\maxdepth - % Get the available space for the double columns -- the normal - % (undoubled) page height minus any material left over from the - % previous page. - \dimen@ = \vsize - \divide\dimen@ by 2 - \advance\dimen@ by -\ht\partialpage - % - % box0 will be the left-hand column, box2 the right. - \setbox0=\vsplit255 to\dimen@ \setbox2=\vsplit255 to\dimen@ - \onepageout\pagesofar - \unvbox255 - \penalty\outputpenalty -} -% -% Re-output the contents of the output page -- any previous material, -% followed by the two boxes we just split, in box0 and box2. -\def\pagesofar{% - \unvbox\partialpage - % - \hsize = \doublecolumnhsize - \wd0=\hsize \wd2=\hsize - \hbox to\pagewidth{\box0\hfil\box2}% -} -% -% All done with double columns. -\def\enddoublecolumns{% - \output = {% - % Split the last of the double-column material. Leave it on the - % current page, no automatic page break. - \balancecolumns - % - % If we end up splitting too much material for the current page, - % though, there will be another page break right after this \output - % invocation ends. Having called \balancecolumns once, we do not - % want to call it again. Therefore, reset \output to its normal - % definition right away. (We hope \balancecolumns will never be - % called on to balance too much material, but if it is, this makes - % the output somewhat more palatable.) - \global\output = {\onepageout{\pagecontents\PAGE}}% - }% - \eject - \endgroup % started in \begindoublecolumns - % - % \pagegoal was set to the doubled \vsize above, since we restarted - % the current page. We're now back to normal single-column - % typesetting, so reset \pagegoal to the normal \vsize (after the - % \endgroup where \vsize got restored). - \pagegoal = \vsize -} -% -% Called at the end of the double column material. -\def\balancecolumns{% - \setbox0 = \vbox{\unvbox255}% like \box255 but more efficient, see p.120. - \dimen@ = \ht0 - \advance\dimen@ by \topskip - \advance\dimen@ by-\baselineskip - \divide\dimen@ by 2 % target to split to - %debug\message{final 2-column material height=\the\ht0, target=\the\dimen@.}% - \splittopskip = \topskip - % Loop until we get a decent breakpoint. - {% - \vbadness = 10000 - \loop - \global\setbox3 = \copy0 - \global\setbox1 = \vsplit3 to \dimen@ - \ifdim\ht3>\dimen@ - \global\advance\dimen@ by 1pt - \repeat - }% - %debug\message{split to \the\dimen@, column heights: \the\ht1, \the\ht3.}% - \setbox0=\vbox to\dimen@{\unvbox1}% - \setbox2=\vbox to\dimen@{\unvbox3}% - % - \pagesofar -} -\catcode`\@ = \other - - -\message{sectioning,} -% Chapters, sections, etc. - -% \unnumberedno is an oxymoron, of course. But we count the unnumbered -% sections so that we can refer to them unambiguously in the pdf -% outlines by their "section number". We avoid collisions with chapter -% numbers by starting them at 10000. (If a document ever has 10000 -% chapters, we're in trouble anyway, I'm sure.) -\newcount\unnumberedno \unnumberedno = 10000 -\newcount\chapno -\newcount\secno \secno=0 -\newcount\subsecno \subsecno=0 -\newcount\subsubsecno \subsubsecno=0 - -% This counter is funny since it counts through charcodes of letters A, B, ... -\newcount\appendixno \appendixno = `\@ -% -% \def\appendixletter{\char\the\appendixno} -% We do the following ugly conditional instead of the above simple -% construct for the sake of pdftex, which needs the actual -% letter in the expansion, not just typeset. -% -\def\appendixletter{% - \ifnum\appendixno=`A A% - \else\ifnum\appendixno=`B B% - \else\ifnum\appendixno=`C C% - \else\ifnum\appendixno=`D D% - \else\ifnum\appendixno=`E E% - \else\ifnum\appendixno=`F F% - \else\ifnum\appendixno=`G G% - \else\ifnum\appendixno=`H H% - \else\ifnum\appendixno=`I I% - \else\ifnum\appendixno=`J J% - \else\ifnum\appendixno=`K K% - \else\ifnum\appendixno=`L L% - \else\ifnum\appendixno=`M M% - \else\ifnum\appendixno=`N N% - \else\ifnum\appendixno=`O O% - \else\ifnum\appendixno=`P P% - \else\ifnum\appendixno=`Q Q% - \else\ifnum\appendixno=`R R% - \else\ifnum\appendixno=`S S% - \else\ifnum\appendixno=`T T% - \else\ifnum\appendixno=`U U% - \else\ifnum\appendixno=`V V% - \else\ifnum\appendixno=`W W% - \else\ifnum\appendixno=`X X% - \else\ifnum\appendixno=`Y Y% - \else\ifnum\appendixno=`Z Z% - % The \the is necessary, despite appearances, because \appendixletter is - % expanded while writing the .toc file. \char\appendixno is not - % expandable, thus it is written literally, thus all appendixes come out - % with the same letter (or @) in the toc without it. - \else\char\the\appendixno - \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi - \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi} - -% Each @chapter defines this as the name of the chapter. -% page headings and footings can use it. @section does likewise. -% However, they are not reliable, because we don't use marks. -\def\thischapter{} -\def\thissection{} - -\newcount\absseclevel % used to calculate proper heading level -\newcount\secbase\secbase=0 % @raisesections/@lowersections modify this count - -% @raisesections: treat @section as chapter, @subsection as section, etc. -\def\raisesections{\global\advance\secbase by -1} -\let\up=\raisesections % original BFox name - -% @lowersections: treat @chapter as section, @section as subsection, etc. -\def\lowersections{\global\advance\secbase by 1} -\let\down=\lowersections % original BFox name - -% we only have subsub. -\chardef\maxseclevel = 3 -% -% A numbered section within an unnumbered changes to unnumbered too. -% To achive this, remember the "biggest" unnum. sec. we are currently in: -\chardef\unmlevel = \maxseclevel -% -% Trace whether the current chapter is an appendix or not: -% \chapheadtype is "N" or "A", unnumbered chapters are ignored. -\def\chapheadtype{N} - -% Choose a heading macro -% #1 is heading type -% #2 is heading level -% #3 is text for heading -\def\genhead#1#2#3{% - % Compute the abs. sec. level: - \absseclevel=#2 - \advance\absseclevel by \secbase - % Make sure \absseclevel doesn't fall outside the range: - \ifnum \absseclevel < 0 - \absseclevel = 0 - \else - \ifnum \absseclevel > 3 - \absseclevel = 3 - \fi - \fi - % The heading type: - \def\headtype{#1}% - \if \headtype U% - \ifnum \absseclevel < \unmlevel - \chardef\unmlevel = \absseclevel - \fi - \else - % Check for appendix sections: - \ifnum \absseclevel = 0 - \edef\chapheadtype{\headtype}% - \else - \if \headtype A\if \chapheadtype N% - \errmessage{@appendix... within a non-appendix chapter}% - \fi\fi - \fi - % Check for numbered within unnumbered: - \ifnum \absseclevel > \unmlevel - \def\headtype{U}% - \else - \chardef\unmlevel = 3 - \fi - \fi - % Now print the heading: - \if \headtype U% - \ifcase\absseclevel - \unnumberedzzz{#3}% - \or \unnumberedseczzz{#3}% - \or \unnumberedsubseczzz{#3}% - \or \unnumberedsubsubseczzz{#3}% - \fi - \else - \if \headtype A% - \ifcase\absseclevel - \appendixzzz{#3}% - \or \appendixsectionzzz{#3}% - \or \appendixsubseczzz{#3}% - \or \appendixsubsubseczzz{#3}% - \fi - \else - \ifcase\absseclevel - \chapterzzz{#3}% - \or \seczzz{#3}% - \or \numberedsubseczzz{#3}% - \or \numberedsubsubseczzz{#3}% - \fi - \fi - \fi - \suppressfirstparagraphindent -} - -% an interface: -\def\numhead{\genhead N} -\def\apphead{\genhead A} -\def\unnmhead{\genhead U} - -% @chapter, @appendix, @unnumbered. Increment top-level counter, reset -% all lower-level sectioning counters to zero. -% -% Also set \chaplevelprefix, which we prepend to @float sequence numbers -% (e.g., figures), q.v. By default (before any chapter), that is empty. -\let\chaplevelprefix = \empty -% -\outer\parseargdef\chapter{\numhead0{#1}} % normally numhead0 calls chapterzzz -\def\chapterzzz#1{% - % section resetting is \global in case the chapter is in a group, such - % as an @include file. - \global\secno=0 \global\subsecno=0 \global\subsubsecno=0 - \global\advance\chapno by 1 - % - % Used for \float. - \gdef\chaplevelprefix{\the\chapno.}% - \resetallfloatnos - % - \message{\putwordChapter\space \the\chapno}% - % - % Write the actual heading. - \chapmacro{#1}{Ynumbered}{\the\chapno}% - % - % So @section and the like are numbered underneath this chapter. - \global\let\section = \numberedsec - \global\let\subsection = \numberedsubsec - \global\let\subsubsection = \numberedsubsubsec -} - -\outer\parseargdef\appendix{\apphead0{#1}} % normally apphead0 calls appendixzzz -\def\appendixzzz#1{% - \global\secno=0 \global\subsecno=0 \global\subsubsecno=0 - \global\advance\appendixno by 1 - \gdef\chaplevelprefix{\appendixletter.}% - \resetallfloatnos - % - \def\appendixnum{\putwordAppendix\space \appendixletter}% - \message{\appendixnum}% - % - \chapmacro{#1}{Yappendix}{\appendixletter}% - % - \global\let\section = \appendixsec - \global\let\subsection = \appendixsubsec - \global\let\subsubsection = \appendixsubsubsec -} - -\outer\parseargdef\unnumbered{\unnmhead0{#1}} % normally unnmhead0 calls unnumberedzzz -\def\unnumberedzzz#1{% - \global\secno=0 \global\subsecno=0 \global\subsubsecno=0 - \global\advance\unnumberedno by 1 - % - % Since an unnumbered has no number, no prefix for figures. - \global\let\chaplevelprefix = \empty - \resetallfloatnos - % - % This used to be simply \message{#1}, but TeX fully expands the - % argument to \message. Therefore, if #1 contained @-commands, TeX - % expanded them. For example, in `@unnumbered The @cite{Book}', TeX - % expanded @cite (which turns out to cause errors because \cite is meant - % to be executed, not expanded). - % - % Anyway, we don't want the fully-expanded definition of @cite to appear - % as a result of the \message, we just want `@cite' itself. We use - % \the<toks register> to achieve this: TeX expands \the<toks> only once, - % simply yielding the contents of <toks register>. (We also do this for - % the toc entries.) - \toks0 = {#1}% - \message{(\the\toks0)}% - % - \chapmacro{#1}{Ynothing}{\the\unnumberedno}% - % - \global\let\section = \unnumberedsec - \global\let\subsection = \unnumberedsubsec - \global\let\subsubsection = \unnumberedsubsubsec -} - -% @centerchap is like @unnumbered, but the heading is centered. -\outer\parseargdef\centerchap{% - % Well, we could do the following in a group, but that would break - % an assumption that \chapmacro is called at the outermost level. - % Thus we are safer this way: --kasal, 24feb04 - \let\centerparametersmaybe = \centerparameters - \unnmhead0{#1}% - \let\centerparametersmaybe = \relax -} - -% @top is like @unnumbered. -\let\top\unnumbered - -% Sections. -\outer\parseargdef\numberedsec{\numhead1{#1}} % normally calls seczzz -\def\seczzz#1{% - \global\subsecno=0 \global\subsubsecno=0 \global\advance\secno by 1 - \sectionheading{#1}{sec}{Ynumbered}{\the\chapno.\the\secno}% -} - -\outer\parseargdef\appendixsection{\apphead1{#1}} % normally calls appendixsectionzzz -\def\appendixsectionzzz#1{% - \global\subsecno=0 \global\subsubsecno=0 \global\advance\secno by 1 - \sectionheading{#1}{sec}{Yappendix}{\appendixletter.\the\secno}% -} -\let\appendixsec\appendixsection - -\outer\parseargdef\unnumberedsec{\unnmhead1{#1}} % normally calls unnumberedseczzz -\def\unnumberedseczzz#1{% - \global\subsecno=0 \global\subsubsecno=0 \global\advance\secno by 1 - \sectionheading{#1}{sec}{Ynothing}{\the\unnumberedno.\the\secno}% -} - -% Subsections. -\outer\parseargdef\numberedsubsec{\numhead2{#1}} % normally calls numberedsubseczzz -\def\numberedsubseczzz#1{% - \global\subsubsecno=0 \global\advance\subsecno by 1 - \sectionheading{#1}{subsec}{Ynumbered}{\the\chapno.\the\secno.\the\subsecno}% -} - -\outer\parseargdef\appendixsubsec{\apphead2{#1}} % normally calls appendixsubseczzz -\def\appendixsubseczzz#1{% - \global\subsubsecno=0 \global\advance\subsecno by 1 - \sectionheading{#1}{subsec}{Yappendix}% - {\appendixletter.\the\secno.\the\subsecno}% -} - -\outer\parseargdef\unnumberedsubsec{\unnmhead2{#1}} %normally calls unnumberedsubseczzz -\def\unnumberedsubseczzz#1{% - \global\subsubsecno=0 \global\advance\subsecno by 1 - \sectionheading{#1}{subsec}{Ynothing}% - {\the\unnumberedno.\the\secno.\the\subsecno}% -} - -% Subsubsections. -\outer\parseargdef\numberedsubsubsec{\numhead3{#1}} % normally numberedsubsubseczzz -\def\numberedsubsubseczzz#1{% - \global\advance\subsubsecno by 1 - \sectionheading{#1}{subsubsec}{Ynumbered}% - {\the\chapno.\the\secno.\the\subsecno.\the\subsubsecno}% -} - -\outer\parseargdef\appendixsubsubsec{\apphead3{#1}} % normally appendixsubsubseczzz -\def\appendixsubsubseczzz#1{% - \global\advance\subsubsecno by 1 - \sectionheading{#1}{subsubsec}{Yappendix}% - {\appendixletter.\the\secno.\the\subsecno.\the\subsubsecno}% -} - -\outer\parseargdef\unnumberedsubsubsec{\unnmhead3{#1}} %normally unnumberedsubsubseczzz -\def\unnumberedsubsubseczzz#1{% - \global\advance\subsubsecno by 1 - \sectionheading{#1}{subsubsec}{Ynothing}% - {\the\unnumberedno.\the\secno.\the\subsecno.\the\subsubsecno}% -} - -% These macros control what the section commands do, according -% to what kind of chapter we are in (ordinary, appendix, or unnumbered). -% Define them by default for a numbered chapter. -\let\section = \numberedsec -\let\subsection = \numberedsubsec -\let\subsubsection = \numberedsubsubsec - -% Define @majorheading, @heading and @subheading - -% NOTE on use of \vbox for chapter headings, section headings, and such: -% 1) We use \vbox rather than the earlier \line to permit -% overlong headings to fold. -% 2) \hyphenpenalty is set to 10000 because hyphenation in a -% heading is obnoxious; this forbids it. -% 3) Likewise, headings look best if no \parindent is used, and -% if justification is not attempted. Hence \raggedright. - - -\def\majorheading{% - {\advance\chapheadingskip by 10pt \chapbreak }% - \parsearg\chapheadingzzz -} - -\def\chapheading{\chapbreak \parsearg\chapheadingzzz} -\def\chapheadingzzz#1{% - {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000 - \parindent=0pt\raggedright - \rm #1\hfill}}% - \bigskip \par\penalty 200\relax - \suppressfirstparagraphindent -} - -% @heading, @subheading, @subsubheading. -\parseargdef\heading{\sectionheading{#1}{sec}{Yomitfromtoc}{} - \suppressfirstparagraphindent} -\parseargdef\subheading{\sectionheading{#1}{subsec}{Yomitfromtoc}{} - \suppressfirstparagraphindent} -\parseargdef\subsubheading{\sectionheading{#1}{subsubsec}{Yomitfromtoc}{} - \suppressfirstparagraphindent} - -% These macros generate a chapter, section, etc. heading only -% (including whitespace, linebreaking, etc. around it), -% given all the information in convenient, parsed form. - -%%% Args are the skip and penalty (usually negative) -\def\dobreak#1#2{\par\ifdim\lastskip<#1\removelastskip\penalty#2\vskip#1\fi} - -%%% Define plain chapter starts, and page on/off switching for it -% Parameter controlling skip before chapter headings (if needed) - -\newskip\chapheadingskip - -\def\chapbreak{\dobreak \chapheadingskip {-4000}} -\def\chappager{\par\vfill\supereject} -\def\chapoddpage{\chappager \ifodd\pageno \else \hbox to 0pt{} \chappager\fi} - -\def\setchapternewpage #1 {\csname CHAPPAG#1\endcsname} - -\def\CHAPPAGoff{% -\global\let\contentsalignmacro = \chappager -\global\let\pchapsepmacro=\chapbreak -\global\let\pagealignmacro=\chappager} - -\def\CHAPPAGon{% -\global\let\contentsalignmacro = \chappager -\global\let\pchapsepmacro=\chappager -\global\let\pagealignmacro=\chappager -\global\def\HEADINGSon{\HEADINGSsingle}} - -\def\CHAPPAGodd{% -\global\let\contentsalignmacro = \chapoddpage -\global\let\pchapsepmacro=\chapoddpage -\global\let\pagealignmacro=\chapoddpage -\global\def\HEADINGSon{\HEADINGSdouble}} - -\CHAPPAGon - -% Chapter opening. -% -% #1 is the text, #2 is the section type (Ynumbered, Ynothing, -% Yappendix, Yomitfromtoc), #3 the chapter number. -% -% To test against our argument. -\def\Ynothingkeyword{Ynothing} -\def\Yomitfromtockeyword{Yomitfromtoc} -\def\Yappendixkeyword{Yappendix} -% -\def\chapmacro#1#2#3{% - \pchapsepmacro - {% - \chapfonts \rm - % - % Have to define \thissection before calling \donoderef, because the - % xref code eventually uses it. On the other hand, it has to be called - % after \pchapsepmacro, or the headline will change too soon. - \gdef\thissection{#1}% - \gdef\thischaptername{#1}% - % - % Only insert the separating space if we have a chapter/appendix - % number, and don't print the unnumbered ``number''. - \def\temptype{#2}% - \ifx\temptype\Ynothingkeyword - \setbox0 = \hbox{}% - \def\toctype{unnchap}% - \gdef\thischapter{#1}% - \else\ifx\temptype\Yomitfromtockeyword - \setbox0 = \hbox{}% contents like unnumbered, but no toc entry - \def\toctype{omit}% - \gdef\thischapter{}% - \else\ifx\temptype\Yappendixkeyword - \setbox0 = \hbox{\putwordAppendix{} #3\enspace}% - \def\toctype{app}% - % We don't substitute the actual chapter name into \thischapter - % because we don't want its macros evaluated now. And we don't - % use \thissection because that changes with each section. - % - \xdef\thischapter{\putwordAppendix{} \appendixletter: - \noexpand\thischaptername}% - \else - \setbox0 = \hbox{#3\enspace}% - \def\toctype{numchap}% - \xdef\thischapter{\putwordChapter{} \the\chapno: - \noexpand\thischaptername}% - \fi\fi\fi - % - % Write the toc entry for this chapter. Must come before the - % \donoderef, because we include the current node name in the toc - % entry, and \donoderef resets it to empty. - \writetocentry{\toctype}{#1}{#3}% - % - % For pdftex, we have to write out the node definition (aka, make - % the pdfdest) after any page break, but before the actual text has - % been typeset. If the destination for the pdf outline is after the - % text, then jumping from the outline may wind up with the text not - % being visible, for instance under high magnification. - \donoderef{#2}% - % - % Typeset the actual heading. - \vbox{\hyphenpenalty=10000 \tolerance=5000 \parindent=0pt \raggedright - \hangindent=\wd0 \centerparametersmaybe - \unhbox0 #1\par}% - }% - \nobreak\bigskip % no page break after a chapter title - \nobreak -} - -% @centerchap -- centered and unnumbered. -\let\centerparametersmaybe = \relax -\def\centerparameters{% - \advance\rightskip by 3\rightskip - \leftskip = \rightskip - \parfillskip = 0pt -} - - -% I don't think this chapter style is supported any more, so I'm not -% updating it with the new noderef stuff. We'll see. --karl, 11aug03. -% -\def\setchapterstyle #1 {\csname CHAPF#1\endcsname} -% -\def\unnchfopen #1{% -\chapoddpage {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000 - \parindent=0pt\raggedright - \rm #1\hfill}}\bigskip \par\nobreak -} -\def\chfopen #1#2{\chapoddpage {\chapfonts -\vbox to 3in{\vfil \hbox to\hsize{\hfil #2} \hbox to\hsize{\hfil #1} \vfil}}% -\par\penalty 5000 % -} -\def\centerchfopen #1{% -\chapoddpage {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000 - \parindent=0pt - \hfill {\rm #1}\hfill}}\bigskip \par\nobreak -} -\def\CHAPFopen{% - \global\let\chapmacro=\chfopen - \global\let\centerchapmacro=\centerchfopen} - - -% Section titles. These macros combine the section number parts and -% call the generic \sectionheading to do the printing. -% -\newskip\secheadingskip -\def\secheadingbreak{\dobreak \secheadingskip{-1000}} - -% Subsection titles. -\newskip\subsecheadingskip -\def\subsecheadingbreak{\dobreak \subsecheadingskip{-500}} - -% Subsubsection titles. -\def\subsubsecheadingskip{\subsecheadingskip} -\def\subsubsecheadingbreak{\subsecheadingbreak} - - -% Print any size, any type, section title. -% -% #1 is the text, #2 is the section level (sec/subsec/subsubsec), #3 is -% the section type for xrefs (Ynumbered, Ynothing, Yappendix), #4 is the -% section number. -% -\def\sectionheading#1#2#3#4{% - {% - % Switch to the right set of fonts. - \csname #2fonts\endcsname \rm - % - % Insert space above the heading. - \csname #2headingbreak\endcsname - % - % Only insert the space after the number if we have a section number. - \def\sectionlevel{#2}% - \def\temptype{#3}% - % - \ifx\temptype\Ynothingkeyword - \setbox0 = \hbox{}% - \def\toctype{unn}% - \gdef\thissection{#1}% - \else\ifx\temptype\Yomitfromtockeyword - % for @headings -- no section number, don't include in toc, - % and don't redefine \thissection. - \setbox0 = \hbox{}% - \def\toctype{omit}% - \let\sectionlevel=\empty - \else\ifx\temptype\Yappendixkeyword - \setbox0 = \hbox{#4\enspace}% - \def\toctype{app}% - \gdef\thissection{#1}% - \else - \setbox0 = \hbox{#4\enspace}% - \def\toctype{num}% - \gdef\thissection{#1}% - \fi\fi\fi - % - % Write the toc entry (before \donoderef). See comments in \chfplain. - \writetocentry{\toctype\sectionlevel}{#1}{#4}% - % - % Write the node reference (= pdf destination for pdftex). - % Again, see comments in \chfplain. - \donoderef{#3}% - % - % Output the actual section heading. - \vbox{\hyphenpenalty=10000 \tolerance=5000 \parindent=0pt \raggedright - \hangindent=\wd0 % zero if no section number - \unhbox0 #1}% - }% - % Add extra space after the heading -- half of whatever came above it. - % Don't allow stretch, though. - \kern .5 \csname #2headingskip\endcsname - % - % Do not let the kern be a potential breakpoint, as it would be if it - % was followed by glue. - \nobreak - % - % We'll almost certainly start a paragraph next, so don't let that - % glue accumulate. (Not a breakpoint because it's preceded by a - % discardable item.) - \vskip-\parskip - % - % This is purely so the last item on the list is a known \penalty > - % 10000. This is so \startdefun can avoid allowing breakpoints after - % section headings. Otherwise, it would insert a valid breakpoint between: - % - % @section sec-whatever - % @deffn def-whatever - \penalty 10001 -} - - -\message{toc,} -% Table of contents. -\newwrite\tocfile - -% Write an entry to the toc file, opening it if necessary. -% Called from @chapter, etc. -% -% Example usage: \writetocentry{sec}{Section Name}{\the\chapno.\the\secno} -% We append the current node name (if any) and page number as additional -% arguments for the \{chap,sec,...}entry macros which will eventually -% read this. The node name is used in the pdf outlines as the -% destination to jump to. -% -% We open the .toc file for writing here instead of at @setfilename (or -% any other fixed time) so that @contents can be anywhere in the document. -% But if #1 is `omit', then we don't do anything. This is used for the -% table of contents chapter openings themselves. -% -\newif\iftocfileopened -\def\omitkeyword{omit}% -% -\def\writetocentry#1#2#3{% - \edef\writetoctype{#1}% - \ifx\writetoctype\omitkeyword \else - \iftocfileopened\else - \immediate\openout\tocfile = \jobname.toc - \global\tocfileopenedtrue - \fi - % - \iflinks - {\atdummies - \edef\temp{% - \write\tocfile{@#1entry{#2}{#3}{\lastnode}{\noexpand\folio}}}% - \temp - } - \fi - \fi - % - % Tell \shipout to create a pdf destination on each page, if we're - % writing pdf. These are used in the table of contents. We can't - % just write one on every page because the title pages are numbered - % 1 and 2 (the page numbers aren't printed), and so are the first - % two pages of the document. Thus, we'd have two destinations named - % `1', and two named `2'. - \ifpdf \global\pdfmakepagedesttrue \fi -} - - -% These characters do not print properly in the Computer Modern roman -% fonts, so we must take special care. This is more or less redundant -% with the Texinfo input format setup at the end of this file. -% -\def\activecatcodes{% - \catcode`\"=\active - \catcode`\$=\active - \catcode`\<=\active - \catcode`\>=\active - \catcode`\\=\active - \catcode`\^=\active - \catcode`\_=\active - \catcode`\|=\active - \catcode`\~=\active -} - - -% Read the toc file, which is essentially Texinfo input. -\def\readtocfile{% - \setupdatafile - \activecatcodes - \input \jobname.toc -} - -\newskip\contentsrightmargin \contentsrightmargin=1in -\newcount\savepageno -\newcount\lastnegativepageno \lastnegativepageno = -1 - -% Prepare to read what we've written to \tocfile. -% -\def\startcontents#1{% - % If @setchapternewpage on, and @headings double, the contents should - % start on an odd page, unlike chapters. Thus, we maintain - % \contentsalignmacro in parallel with \pagealignmacro. - % From: Torbjorn Granlund <tege@matematik.su.se> - \contentsalignmacro - \immediate\closeout\tocfile - % - % Don't need to put `Contents' or `Short Contents' in the headline. - % It is abundantly clear what they are. - \def\thischapter{}% - \chapmacro{#1}{Yomitfromtoc}{}% - % - \savepageno = \pageno - \begingroup % Set up to handle contents files properly. - \raggedbottom % Worry more about breakpoints than the bottom. - \advance\hsize by -\contentsrightmargin % Don't use the full line length. - % - % Roman numerals for page numbers. - \ifnum \pageno>0 \global\pageno = \lastnegativepageno \fi -} - - -% Normal (long) toc. -\def\contents{% - \startcontents{\putwordTOC}% - \openin 1 \jobname.toc - \ifeof 1 \else - \readtocfile - \fi - \vfill \eject - \contentsalignmacro % in case @setchapternewpage odd is in effect - \ifeof 1 \else - \pdfmakeoutlines - \fi - \closein 1 - \endgroup - \lastnegativepageno = \pageno - \global\pageno = \savepageno -} - -% And just the chapters. -\def\summarycontents{% - \startcontents{\putwordShortTOC}% - % - \let\numchapentry = \shortchapentry - \let\appentry = \shortchapentry - \let\unnchapentry = \shortunnchapentry - % We want a true roman here for the page numbers. - \secfonts - \let\rm=\shortcontrm \let\bf=\shortcontbf - \let\sl=\shortcontsl \let\tt=\shortconttt - \rm - \hyphenpenalty = 10000 - \advance\baselineskip by 1pt % Open it up a little. - \def\numsecentry##1##2##3##4{} - \let\appsecentry = \numsecentry - \let\unnsecentry = \numsecentry - \let\numsubsecentry = \numsecentry - \let\appsubsecentry = \numsecentry - \let\unnsubsecentry = \numsecentry - \let\numsubsubsecentry = \numsecentry - \let\appsubsubsecentry = \numsecentry - \let\unnsubsubsecentry = \numsecentry - \openin 1 \jobname.toc - \ifeof 1 \else - \readtocfile - \fi - \closein 1 - \vfill \eject - \contentsalignmacro % in case @setchapternewpage odd is in effect - \endgroup - \lastnegativepageno = \pageno - \global\pageno = \savepageno -} -\let\shortcontents = \summarycontents - -% Typeset the label for a chapter or appendix for the short contents. -% The arg is, e.g., `A' for an appendix, or `3' for a chapter. -% -\def\shortchaplabel#1{% - % This space should be enough, since a single number is .5em, and the - % widest letter (M) is 1em, at least in the Computer Modern fonts. - % But use \hss just in case. - % (This space doesn't include the extra space that gets added after - % the label; that gets put in by \shortchapentry above.) - % - % We'd like to right-justify chapter numbers, but that looks strange - % with appendix letters. And right-justifying numbers and - % left-justifying letters looks strange when there is less than 10 - % chapters. Have to read the whole toc once to know how many chapters - % there are before deciding ... - \hbox to 1em{#1\hss}% -} - -% These macros generate individual entries in the table of contents. -% The first argument is the chapter or section name. -% The last argument is the page number. -% The arguments in between are the chapter number, section number, ... - -% Chapters, in the main contents. -\def\numchapentry#1#2#3#4{\dochapentry{#2\labelspace#1}{#4}} -% -% Chapters, in the short toc. -% See comments in \dochapentry re vbox and related settings. -\def\shortchapentry#1#2#3#4{% - \tocentry{\shortchaplabel{#2}\labelspace #1}{\doshortpageno\bgroup#4\egroup}% -} - -% Appendices, in the main contents. -% Need the word Appendix, and a fixed-size box. -% -\def\appendixbox#1{% - % We use M since it's probably the widest letter. - \setbox0 = \hbox{\putwordAppendix{} M}% - \hbox to \wd0{\putwordAppendix{} #1\hss}} -% -\def\appentry#1#2#3#4{\dochapentry{\appendixbox{#2}\labelspace#1}{#4}} - -% Unnumbered chapters. -\def\unnchapentry#1#2#3#4{\dochapentry{#1}{#4}} -\def\shortunnchapentry#1#2#3#4{\tocentry{#1}{\doshortpageno\bgroup#4\egroup}} - -% Sections. -\def\numsecentry#1#2#3#4{\dosecentry{#2\labelspace#1}{#4}} -\let\appsecentry=\numsecentry -\def\unnsecentry#1#2#3#4{\dosecentry{#1}{#4}} - -% Subsections. -\def\numsubsecentry#1#2#3#4{\dosubsecentry{#2\labelspace#1}{#4}} -\let\appsubsecentry=\numsubsecentry -\def\unnsubsecentry#1#2#3#4{\dosubsecentry{#1}{#4}} - -% And subsubsections. -\def\numsubsubsecentry#1#2#3#4{\dosubsubsecentry{#2\labelspace#1}{#4}} -\let\appsubsubsecentry=\numsubsubsecentry -\def\unnsubsubsecentry#1#2#3#4{\dosubsubsecentry{#1}{#4}} - -% This parameter controls the indentation of the various levels. -% Same as \defaultparindent. -\newdimen\tocindent \tocindent = 15pt - -% Now for the actual typesetting. In all these, #1 is the text and #2 is the -% page number. -% -% If the toc has to be broken over pages, we want it to be at chapters -% if at all possible; hence the \penalty. -\def\dochapentry#1#2{% - \penalty-300 \vskip1\baselineskip plus.33\baselineskip minus.25\baselineskip - \begingroup - \chapentryfonts - \tocentry{#1}{\dopageno\bgroup#2\egroup}% - \endgroup - \nobreak\vskip .25\baselineskip plus.1\baselineskip -} - -\def\dosecentry#1#2{\begingroup - \secentryfonts \leftskip=\tocindent - \tocentry{#1}{\dopageno\bgroup#2\egroup}% -\endgroup} - -\def\dosubsecentry#1#2{\begingroup - \subsecentryfonts \leftskip=2\tocindent - \tocentry{#1}{\dopageno\bgroup#2\egroup}% -\endgroup} - -\def\dosubsubsecentry#1#2{\begingroup - \subsubsecentryfonts \leftskip=3\tocindent - \tocentry{#1}{\dopageno\bgroup#2\egroup}% -\endgroup} - -% We use the same \entry macro as for the index entries. -\let\tocentry = \entry - -% Space between chapter (or whatever) number and the title. -\def\labelspace{\hskip1em \relax} - -\def\dopageno#1{{\rm #1}} -\def\doshortpageno#1{{\rm #1}} - -\def\chapentryfonts{\secfonts \rm} -\def\secentryfonts{\textfonts} -\def\subsecentryfonts{\textfonts} -\def\subsubsecentryfonts{\textfonts} - - -\message{environments,} -% @foo ... @end foo. - -% @point{}, @result{}, @expansion{}, @print{}, @equiv{}. -% -% Since these characters are used in examples, it should be an even number of -% \tt widths. Each \tt character is 1en, so two makes it 1em. -% -\def\point{$\star$} -\def\result{\leavevmode\raise.15ex\hbox to 1em{\hfil$\Rightarrow$\hfil}} -\def\expansion{\leavevmode\raise.1ex\hbox to 1em{\hfil$\mapsto$\hfil}} -\def\print{\leavevmode\lower.1ex\hbox to 1em{\hfil$\dashv$\hfil}} -\def\equiv{\leavevmode\lower.1ex\hbox to 1em{\hfil$\ptexequiv$\hfil}} - -% The @error{} command. -% Adapted from the TeXbook's \boxit. -% -\newbox\errorbox -% -{\tentt \global\dimen0 = 3em}% Width of the box. -\dimen2 = .55pt % Thickness of rules -% The text. (`r' is open on the right, `e' somewhat less so on the left.) -\setbox0 = \hbox{\kern-.75pt \tensf error\kern-1.5pt} -% -\setbox\errorbox=\hbox to \dimen0{\hfil - \hsize = \dimen0 \advance\hsize by -5.8pt % Space to left+right. - \advance\hsize by -2\dimen2 % Rules. - \vbox{% - \hrule height\dimen2 - \hbox{\vrule width\dimen2 \kern3pt % Space to left of text. - \vtop{\kern2.4pt \box0 \kern2.4pt}% Space above/below. - \kern3pt\vrule width\dimen2}% Space to right. - \hrule height\dimen2} - \hfil} -% -\def\error{\leavevmode\lower.7ex\copy\errorbox} - -% @tex ... @end tex escapes into raw Tex temporarily. -% One exception: @ is still an escape character, so that @end tex works. -% But \@ or @@ will get a plain tex @ character. - -\envdef\tex{% - \catcode `\\=0 \catcode `\{=1 \catcode `\}=2 - \catcode `\$=3 \catcode `\&=4 \catcode `\#=6 - \catcode `\^=7 \catcode `\_=8 \catcode `\~=\active \let~=\tie - \catcode `\%=14 - \catcode `\+=\other - \catcode `\"=\other - \catcode `\|=\other - \catcode `\<=\other - \catcode `\>=\other - \escapechar=`\\ - % - \let\b=\ptexb - \let\bullet=\ptexbullet - \let\c=\ptexc - \let\,=\ptexcomma - \let\.=\ptexdot - \let\dots=\ptexdots - \let\equiv=\ptexequiv - \let\!=\ptexexclam - \let\i=\ptexi - \let\indent=\ptexindent - \let\noindent=\ptexnoindent - \let\{=\ptexlbrace - \let\+=\tabalign - \let\}=\ptexrbrace - \let\/=\ptexslash - \let\*=\ptexstar - \let\t=\ptext - \let\frenchspacing=\plainfrenchspacing - % - \def\endldots{\mathinner{\ldots\ldots\ldots\ldots}}% - \def\enddots{\relax\ifmmode\endldots\else$\mathsurround=0pt \endldots\,$\fi}% - \def\@{@}% -} -% There is no need to define \Etex. - -% Define @lisp ... @end lisp. -% @lisp environment forms a group so it can rebind things, -% including the definition of @end lisp (which normally is erroneous). - -% Amount to narrow the margins by for @lisp. -\newskip\lispnarrowing \lispnarrowing=0.4in - -% This is the definition that ^^M gets inside @lisp, @example, and other -% such environments. \null is better than a space, since it doesn't -% have any width. -\def\lisppar{\null\endgraf} - -% This space is always present above and below environments. -\newskip\envskipamount \envskipamount = 0pt - -% Make spacing and below environment symmetrical. We use \parskip here -% to help in doing that, since in @example-like environments \parskip -% is reset to zero; thus the \afterenvbreak inserts no space -- but the -% start of the next paragraph will insert \parskip. -% -\def\aboveenvbreak{{% - % =10000 instead of <10000 because of a special case in \itemzzz and - % \sectionheading, q.v. - \ifnum \lastpenalty=10000 \else - \advance\envskipamount by \parskip - \endgraf - \ifdim\lastskip<\envskipamount - \removelastskip - % it's not a good place to break if the last penalty was \nobreak - % or better ... - \ifnum\lastpenalty<10000 \penalty-50 \fi - \vskip\envskipamount - \fi - \fi -}} - -\let\afterenvbreak = \aboveenvbreak - -% \nonarrowing is a flag. If "set", @lisp etc don't narrow margins; it will -% also clear it, so that its embedded environments do the narrowing again. -\let\nonarrowing=\relax - -% @cartouche ... @end cartouche: draw rectangle w/rounded corners around -% environment contents. -\font\circle=lcircle10 -\newdimen\circthick -\newdimen\cartouter\newdimen\cartinner -\newskip\normbskip\newskip\normpskip\newskip\normlskip -\circthick=\fontdimen8\circle -% -\def\ctl{{\circle\char'013\hskip -6pt}}% 6pt from pl file: 1/2charwidth -\def\ctr{{\hskip 6pt\circle\char'010}} -\def\cbl{{\circle\char'012\hskip -6pt}} -\def\cbr{{\hskip 6pt\circle\char'011}} -\def\carttop{\hbox to \cartouter{\hskip\lskip - \ctl\leaders\hrule height\circthick\hfil\ctr - \hskip\rskip}} -\def\cartbot{\hbox to \cartouter{\hskip\lskip - \cbl\leaders\hrule height\circthick\hfil\cbr - \hskip\rskip}} -% -\newskip\lskip\newskip\rskip - -\envdef\cartouche{% - \ifhmode\par\fi % can't be in the midst of a paragraph. - \startsavinginserts - \lskip=\leftskip \rskip=\rightskip - \leftskip=0pt\rightskip=0pt % we want these *outside*. - \cartinner=\hsize \advance\cartinner by-\lskip - \advance\cartinner by-\rskip - \cartouter=\hsize - \advance\cartouter by 18.4pt % allow for 3pt kerns on either - % side, and for 6pt waste from - % each corner char, and rule thickness - \normbskip=\baselineskip \normpskip=\parskip \normlskip=\lineskip - % Flag to tell @lisp, etc., not to narrow margin. - \let\nonarrowing = t% - \vbox\bgroup - \baselineskip=0pt\parskip=0pt\lineskip=0pt - \carttop - \hbox\bgroup - \hskip\lskip - \vrule\kern3pt - \vbox\bgroup - \kern3pt - \hsize=\cartinner - \baselineskip=\normbskip - \lineskip=\normlskip - \parskip=\normpskip - \vskip -\parskip - \comment % For explanation, see the end of \def\group. -} -\def\Ecartouche{% - \ifhmode\par\fi - \kern3pt - \egroup - \kern3pt\vrule - \hskip\rskip - \egroup - \cartbot - \egroup - \checkinserts -} - - -% This macro is called at the beginning of all the @example variants, -% inside a group. -\def\nonfillstart{% - \aboveenvbreak - \hfuzz = 12pt % Don't be fussy - \sepspaces % Make spaces be word-separators rather than space tokens. - \let\par = \lisppar % don't ignore blank lines - \obeylines % each line of input is a line of output - \parskip = 0pt - \parindent = 0pt - \emergencystretch = 0pt % don't try to avoid overfull boxes - \ifx\nonarrowing\relax - \advance \leftskip by \lispnarrowing - \exdentamount=\lispnarrowing - \else - \let\nonarrowing = \relax - \fi - \let\exdent=\nofillexdent -} - -% If you want all examples etc. small: @set dispenvsize small. -% If you want even small examples the full size: @set dispenvsize nosmall. -% This affects the following displayed environments: -% @example, @display, @format, @lisp -% -\def\smallword{small} -\def\nosmallword{nosmall} -\let\SETdispenvsize\relax -\def\setnormaldispenv{% - \ifx\SETdispenvsize\smallword - \smallexamplefonts \rm - \fi -} -\def\setsmalldispenv{% - \ifx\SETdispenvsize\nosmallword - \else - \smallexamplefonts \rm - \fi -} - -% We often define two environments, @foo and @smallfoo. -% Let's do it by one command: -\def\makedispenv #1#2{ - \expandafter\envdef\csname#1\endcsname {\setnormaldispenv #2} - \expandafter\envdef\csname small#1\endcsname {\setsmalldispenv #2} - \expandafter\let\csname E#1\endcsname \afterenvbreak - \expandafter\let\csname Esmall#1\endcsname \afterenvbreak -} - -% Define two synonyms: -\def\maketwodispenvs #1#2#3{ - \makedispenv{#1}{#3} - \makedispenv{#2}{#3} -} - -% @lisp: indented, narrowed, typewriter font; @example: same as @lisp. -% -% @smallexample and @smalllisp: use smaller fonts. -% Originally contributed by Pavel@xerox. -% -\maketwodispenvs {lisp}{example}{% - \nonfillstart - \tt - \let\kbdfont = \kbdexamplefont % Allow @kbd to do something special. - \gobble % eat return -} - -% @display/@smalldisplay: same as @lisp except keep current font. -% -\makedispenv {display}{% - \nonfillstart - \gobble -} - -% @format/@smallformat: same as @display except don't narrow margins. -% -\makedispenv{format}{% - \let\nonarrowing = t% - \nonfillstart - \gobble -} - -% @flushleft: same as @format, but doesn't obey \SETdispenvsize. -\envdef\flushleft{% - \let\nonarrowing = t% - \nonfillstart - \gobble -} -\let\Eflushleft = \afterenvbreak - -% @flushright. -% -\envdef\flushright{% - \let\nonarrowing = t% - \nonfillstart - \advance\leftskip by 0pt plus 1fill - \gobble -} -\let\Eflushright = \afterenvbreak - - -% @quotation does normal linebreaking (hence we can't use \nonfillstart) -% and narrows the margins. We keep \parskip nonzero in general, since -% we're doing normal filling. So, when using \aboveenvbreak and -% \afterenvbreak, temporarily make \parskip 0. -% -\envdef\quotation{% - {\parskip=0pt \aboveenvbreak}% because \aboveenvbreak inserts \parskip - \parindent=0pt - % - % @cartouche defines \nonarrowing to inhibit narrowing at next level down. - \ifx\nonarrowing\relax - \advance\leftskip by \lispnarrowing - \advance\rightskip by \lispnarrowing - \exdentamount = \lispnarrowing - \else - \let\nonarrowing = \relax - \fi - \parsearg\quotationlabel -} - -% We have retained a nonzero parskip for the environment, since we're -% doing normal filling. -% -\def\Equotation{% - \par - \ifx\quotationauthor\undefined\else - % indent a bit. - \leftline{\kern 2\leftskip \sl ---\quotationauthor}% - \fi - {\parskip=0pt \afterenvbreak}% -} - -% If we're given an argument, typeset it in bold with a colon after. -\def\quotationlabel#1{% - \def\temp{#1}% - \ifx\temp\empty \else - {\bf #1: }% - \fi -} - - -% LaTeX-like @verbatim...@end verbatim and @verb{<char>...<char>} -% If we want to allow any <char> as delimiter, -% we need the curly braces so that makeinfo sees the @verb command, eg: -% `@verbx...x' would look like the '@verbx' command. --janneke@gnu.org -% -% [Knuth]: Donald Ervin Knuth, 1996. The TeXbook. -% -% [Knuth] p.344; only we need to do the other characters Texinfo sets -% active too. Otherwise, they get lost as the first character on a -% verbatim line. -\def\dospecials{% - \do\ \do\\\do\{\do\}\do\$\do\&% - \do\#\do\^\do\^^K\do\_\do\^^A\do\%\do\~% - \do\<\do\>\do\|\do\@\do+\do\"% -} -% -% [Knuth] p. 380 -\def\uncatcodespecials{% - \def\do##1{\catcode`##1=\other}\dospecials} -% -% [Knuth] pp. 380,381,391 -% Disable Spanish ligatures ?` and !` of \tt font -\begingroup - \catcode`\`=\active\gdef`{\relax\lq} -\endgroup -% -% Setup for the @verb command. -% -% Eight spaces for a tab -\begingroup - \catcode`\^^I=\active - \gdef\tabeightspaces{\catcode`\^^I=\active\def^^I{\ \ \ \ \ \ \ \ }} -\endgroup -% -\def\setupverb{% - \tt % easiest (and conventionally used) font for verbatim - \def\par{\leavevmode\endgraf}% - \catcode`\`=\active - \tabeightspaces - % Respect line breaks, - % print special symbols as themselves, and - % make each space count - % must do in this order: - \obeylines \uncatcodespecials \sepspaces -} - -% Setup for the @verbatim environment -% -% Real tab expansion -\newdimen\tabw \setbox0=\hbox{\tt\space} \tabw=8\wd0 % tab amount -% -\def\starttabbox{\setbox0=\hbox\bgroup} -\begingroup - \catcode`\^^I=\active - \gdef\tabexpand{% - \catcode`\^^I=\active - \def^^I{\leavevmode\egroup - \dimen0=\wd0 % the width so far, or since the previous tab - \divide\dimen0 by\tabw - \multiply\dimen0 by\tabw % compute previous multiple of \tabw - \advance\dimen0 by\tabw % advance to next multiple of \tabw - \wd0=\dimen0 \box0 \starttabbox - }% - } -\endgroup -\def\setupverbatim{% - \let\nonarrowing = t% - \nonfillstart - % Easiest (and conventionally used) font for verbatim - \tt - \def\par{\leavevmode\egroup\box0\endgraf}% - \catcode`\`=\active - \tabexpand - % Respect line breaks, - % print special symbols as themselves, and - % make each space count - % must do in this order: - \obeylines \uncatcodespecials \sepspaces - \everypar{\starttabbox}% -} - -% Do the @verb magic: verbatim text is quoted by unique -% delimiter characters. Before first delimiter expect a -% right brace, after last delimiter expect closing brace: -% -% \def\doverb'{'<char>#1<char>'}'{#1} -% -% [Knuth] p. 382; only eat outer {} -\begingroup - \catcode`[=1\catcode`]=2\catcode`\{=\other\catcode`\}=\other - \gdef\doverb{#1[\def\next##1#1}[##1\endgroup]\next] -\endgroup -% -\def\verb{\begingroup\setupverb\doverb} -% -% -% Do the @verbatim magic: define the macro \doverbatim so that -% the (first) argument ends when '@end verbatim' is reached, ie: -% -% \def\doverbatim#1@end verbatim{#1} -% -% For Texinfo it's a lot easier than for LaTeX, -% because texinfo's \verbatim doesn't stop at '\end{verbatim}': -% we need not redefine '\', '{' and '}'. -% -% Inspired by LaTeX's verbatim command set [latex.ltx] -% -\begingroup - \catcode`\ =\active - \obeylines % - % ignore everything up to the first ^^M, that's the newline at the end - % of the @verbatim input line itself. Otherwise we get an extra blank - % line in the output. - \xdef\doverbatim#1^^M#2@end verbatim{#2\noexpand\end\gobble verbatim}% - % We really want {...\end verbatim} in the body of the macro, but - % without the active space; thus we have to use \xdef and \gobble. -\endgroup -% -\envdef\verbatim{% - \setupverbatim\doverbatim -} -\let\Everbatim = \afterenvbreak - - -% @verbatiminclude FILE - insert text of file in verbatim environment. -% -\def\verbatiminclude{\parseargusing\filenamecatcodes\doverbatiminclude} -% -\def\doverbatiminclude#1{% - {% - \makevalueexpandable - \setupverbatim - \input #1 - \afterenvbreak - }% -} - -% @copying ... @end copying. -% Save the text away for @insertcopying later. -% -% We save the uninterpreted tokens, rather than creating a box. -% Saving the text in a box would be much easier, but then all the -% typesetting commands (@smallbook, font changes, etc.) have to be done -% beforehand -- and a) we want @copying to be done first in the source -% file; b) letting users define the frontmatter in as flexible order as -% possible is very desirable. -% -\def\copying{\checkenv{}\begingroup\scanargctxt\docopying} -\def\docopying#1@end copying{\endgroup\def\copyingtext{#1}} -% -\def\insertcopying{% - \begingroup - \parindent = 0pt % paragraph indentation looks wrong on title page - \scanexp\copyingtext - \endgroup -} - -\message{defuns,} -% @defun etc. - -\newskip\defbodyindent \defbodyindent=.4in -\newskip\defargsindent \defargsindent=50pt -\newskip\deflastargmargin \deflastargmargin=18pt - -% Start the processing of @deffn: -\def\startdefun{% - \ifnum\lastpenalty<10000 - \medbreak - \else - % If there are two @def commands in a row, we'll have a \nobreak, - % which is there to keep the function description together with its - % header. But if there's nothing but headers, we need to allow a - % break somewhere. Check specifically for penalty 10002, inserted - % by \defargscommonending, instead of 10000, since the sectioning - % commands also insert a nobreak penalty, and we don't want to allow - % a break between a section heading and a defun. - % - \ifnum\lastpenalty=10002 \penalty2000 \fi - % - % Similarly, after a section heading, do not allow a break. - % But do insert the glue. - \medskip % preceded by discardable penalty, so not a breakpoint - \fi - % - \parindent=0in - \advance\leftskip by \defbodyindent - \exdentamount=\defbodyindent -} - -\def\dodefunx#1{% - % First, check whether we are in the right environment: - \checkenv#1% - % - % As above, allow line break if we have multiple x headers in a row. - % It's not a great place, though. - \ifnum\lastpenalty=10002 \penalty3000 \fi - % - % And now, it's time to reuse the body of the original defun: - \expandafter\gobbledefun#1% -} -\def\gobbledefun#1\startdefun{} - -% \printdefunline \deffnheader{text} -% -\def\printdefunline#1#2{% - \begingroup - % call \deffnheader: - #1#2 \endheader - % common ending: - \interlinepenalty = 10000 - \advance\rightskip by 0pt plus 1fil - \endgraf - \nobreak\vskip -\parskip - \penalty 10002 % signal to \startdefun and \dodefunx - % Some of the @defun-type tags do not enable magic parentheses, - % rendering the following check redundant. But we don't optimize. - \checkparencounts - \endgroup -} - -\def\Edefun{\endgraf\medbreak} - -% \makedefun{deffn} creates \deffn, \deffnx and \Edeffn; -% the only thing remainnig is to define \deffnheader. -% -\def\makedefun#1{% - \expandafter\let\csname E#1\endcsname = \Edefun - \edef\temp{\noexpand\domakedefun - \makecsname{#1}\makecsname{#1x}\makecsname{#1header}}% - \temp -} - -% \domakedefun \deffn \deffnx \deffnheader -% -% Define \deffn and \deffnx, without parameters. -% \deffnheader has to be defined explicitly. -% -\def\domakedefun#1#2#3{% - \envdef#1{% - \startdefun - \parseargusing\activeparens{\printdefunline#3}% - }% - \def#2{\dodefunx#1}% - \def#3% -} - -%%% Untyped functions: - -% @deffn category name args -\makedefun{deffn}{\deffngeneral{}} - -% @deffn category class name args -\makedefun{defop}#1 {\defopon{#1\ \putwordon}} - -% \defopon {category on}class name args -\def\defopon#1#2 {\deffngeneral{\putwordon\ \code{#2}}{#1\ \code{#2}} } - -% \deffngeneral {subind}category name args -% -\def\deffngeneral#1#2 #3 #4\endheader{% - % Remember that \dosubind{fn}{foo}{} is equivalent to \doind{fn}{foo}. - \dosubind{fn}{\code{#3}}{#1}% - \defname{#2}{}{#3}\magicamp\defunargs{#4\unskip}% -} - -%%% Typed functions: - -% @deftypefn category type name args -\makedefun{deftypefn}{\deftypefngeneral{}} - -% @deftypeop category class type name args -\makedefun{deftypeop}#1 {\deftypeopon{#1\ \putwordon}} - -% \deftypeopon {category on}class type name args -\def\deftypeopon#1#2 {\deftypefngeneral{\putwordon\ \code{#2}}{#1\ \code{#2}} } - -% \deftypefngeneral {subind}category type name args -% -\def\deftypefngeneral#1#2 #3 #4 #5\endheader{% - \dosubind{fn}{\code{#4}}{#1}% - \defname{#2}{#3}{#4}\defunargs{#5\unskip}% -} - -%%% Typed variables: - -% @deftypevr category type var args -\makedefun{deftypevr}{\deftypecvgeneral{}} - -% @deftypecv category class type var args -\makedefun{deftypecv}#1 {\deftypecvof{#1\ \putwordof}} - -% \deftypecvof {category of}class type var args -\def\deftypecvof#1#2 {\deftypecvgeneral{\putwordof\ \code{#2}}{#1\ \code{#2}} } - -% \deftypecvgeneral {subind}category type var args -% -\def\deftypecvgeneral#1#2 #3 #4 #5\endheader{% - \dosubind{vr}{\code{#4}}{#1}% - \defname{#2}{#3}{#4}\defunargs{#5\unskip}% -} - -%%% Untyped variables: - -% @defvr category var args -\makedefun{defvr}#1 {\deftypevrheader{#1} {} } - -% @defcv category class var args -\makedefun{defcv}#1 {\defcvof{#1\ \putwordof}} - -% \defcvof {category of}class var args -\def\defcvof#1#2 {\deftypecvof{#1}#2 {} } - -%%% Type: -% @deftp category name args -\makedefun{deftp}#1 #2 #3\endheader{% - \doind{tp}{\code{#2}}% - \defname{#1}{}{#2}\defunargs{#3\unskip}% -} - -% Remaining @defun-like shortcuts: -\makedefun{defun}{\deffnheader{\putwordDeffunc} } -\makedefun{defmac}{\deffnheader{\putwordDefmac} } -\makedefun{defspec}{\deffnheader{\putwordDefspec} } -\makedefun{deftypefun}{\deftypefnheader{\putwordDeffunc} } -\makedefun{defvar}{\defvrheader{\putwordDefvar} } -\makedefun{defopt}{\defvrheader{\putwordDefopt} } -\makedefun{deftypevar}{\deftypevrheader{\putwordDefvar} } -\makedefun{defmethod}{\defopon\putwordMethodon} -\makedefun{deftypemethod}{\deftypeopon\putwordMethodon} -\makedefun{defivar}{\defcvof\putwordInstanceVariableof} -\makedefun{deftypeivar}{\deftypecvof\putwordInstanceVariableof} - -% \defname, which formats the name of the @def (not the args). -% #1 is the category, such as "Function". -% #2 is the return type, if any. -% #3 is the function name. -% -% We are followed by (but not passed) the arguments, if any. -% -\def\defname#1#2#3{% - % Get the values of \leftskip and \rightskip as they were outside the @def... - \advance\leftskip by -\defbodyindent - % - % How we'll format the type name. Putting it in brackets helps - % distinguish it from the body text that may end up on the next line - % just below it. - \def\temp{#1}% - \setbox0=\hbox{\kern\deflastargmargin \ifx\temp\empty\else [\rm\temp]\fi} - % - % Figure out line sizes for the paragraph shape. - % The first line needs space for \box0; but if \rightskip is nonzero, - % we need only space for the part of \box0 which exceeds it: - \dimen0=\hsize \advance\dimen0 by -\wd0 \advance\dimen0 by \rightskip - % The continuations: - \dimen2=\hsize \advance\dimen2 by -\defargsindent - % (plain.tex says that \dimen1 should be used only as global.) - \parshape 2 0in \dimen0 \defargsindent \dimen2 - % - % Put the type name to the right margin. - \noindent - \hbox to 0pt{% - \hfil\box0 \kern-\hsize - % \hsize has to be shortened this way: - \kern\leftskip - % Intentionally do not respect \rightskip, since we need the space. - }% - % - % Allow all lines to be underfull without complaint: - \tolerance=10000 \hbadness=10000 - \exdentamount=\defbodyindent - {% - % defun fonts. We use typewriter by default (used to be bold) because: - % . we're printing identifiers, they should be in tt in principle. - % . in languages with many accents, such as Czech or French, it's - % common to leave accents off identifiers. The result looks ok in - % tt, but exceedingly strange in rm. - % . we don't want -- and --- to be treated as ligatures. - % . this still does not fix the ?` and !` ligatures, but so far no - % one has made identifiers using them :). - \df \tt - \def\temp{#2}% return value type - \ifx\temp\empty\else \tclose{\temp} \fi - #3% output function name - }% - {\rm\enskip}% hskip 0.5 em of \tenrm - % - \boldbrax - % arguments will be output next, if any. -} - -% Print arguments in slanted roman (not ttsl), inconsistently with using -% tt for the name. This is because literal text is sometimes needed in -% the argument list (groff manual), and ttsl and tt are not very -% distinguishable. Prevent hyphenation at `-' chars. -% -\def\defunargs#1{% - % use sl by default (not ttsl), - % tt for the names. - \df \sl \hyphenchar\font=0 - % - % On the other hand, if an argument has two dashes (for instance), we - % want a way to get ttsl. Let's try @var for that. - \let\var=\ttslanted - #1% - \sl\hyphenchar\font=45 -} - -% We want ()&[] to print specially on the defun line. -% -\def\activeparens{% - \catcode`\(=\active \catcode`\)=\active - \catcode`\[=\active \catcode`\]=\active - \catcode`\&=\active -} - -% Make control sequences which act like normal parenthesis chars. -\let\lparen = ( \let\rparen = ) - -% Be sure that we always have a definition for `(', etc. For example, -% if the fn name has parens in it, \boldbrax will not be in effect yet, -% so TeX would otherwise complain about undefined control sequence. -{ - \activeparens - \global\let(=\lparen \global\let)=\rparen - \global\let[=\lbrack \global\let]=\rbrack - \global\let& = \& - - \gdef\boldbrax{\let(=\opnr\let)=\clnr\let[=\lbrb\let]=\rbrb} - \gdef\magicamp{\let&=\amprm} -} - -\newcount\parencount - -% If we encounter &foo, then turn on ()-hacking afterwards -\newif\ifampseen -\def\amprm#1 {\ampseentrue{\bf\ }} - -\def\parenfont{% - \ifampseen - % At the first level, print parens in roman, - % otherwise use the default font. - \ifnum \parencount=1 \rm \fi - \else - % The \sf parens (in \boldbrax) actually are a little bolder than - % the contained text. This is especially needed for [ and ] . - \sf - \fi -} -\def\infirstlevel#1{% - \ifampseen - \ifnum\parencount=1 - #1% - \fi - \fi -} -\def\bfafterword#1 {#1 \bf} - -\def\opnr{% - \global\advance\parencount by 1 - {\parenfont(}% - \infirstlevel \bfafterword -} -\def\clnr{% - {\parenfont)}% - \infirstlevel \sl - \global\advance\parencount by -1 -} - -\newcount\brackcount -\def\lbrb{% - \global\advance\brackcount by 1 - {\bf[}% -} -\def\rbrb{% - {\bf]}% - \global\advance\brackcount by -1 -} - -\def\checkparencounts{% - \ifnum\parencount=0 \else \badparencount \fi - \ifnum\brackcount=0 \else \badbrackcount \fi -} -\def\badparencount{% - \errmessage{Unbalanced parentheses in @def}% - \global\parencount=0 -} -\def\badbrackcount{% - \errmessage{Unbalanced square braces in @def}% - \global\brackcount=0 -} - - -\message{macros,} -% @macro. - -% To do this right we need a feature of e-TeX, \scantokens, -% which we arrange to emulate with a temporary file in ordinary TeX. -\ifx\eTeXversion\undefined - \newwrite\macscribble - \def\scantokens#1{% - \toks0={#1}% - \immediate\openout\macscribble=\jobname.tmp - \immediate\write\macscribble{\the\toks0}% - \immediate\closeout\macscribble - \input \jobname.tmp - } -\fi - -\def\scanmacro#1{% - \begingroup - \newlinechar`\^^M - \let\xeatspaces\eatspaces - % Undo catcode changes of \startcontents and \doprintindex - % When called from @insertcopying or (short)caption, we need active - % backslash to get it printed correctly. Previously, we had - % \catcode`\\=\other instead. We'll see whether a problem appears - % with macro expansion. --kasal, 19aug04 - \catcode`\@=0 \catcode`\\=\active \escapechar=`\@ - % ... and \example - \spaceisspace - % - % Append \endinput to make sure that TeX does not see the ending newline. - % - % I've verified that it is necessary both for e-TeX and for ordinary TeX - % --kasal, 29nov03 - \scantokens{#1\endinput}% - \endgroup -} - -\def\scanexp#1{% - \edef\temp{\noexpand\scanmacro{#1}}% - \temp -} - -\newcount\paramno % Count of parameters -\newtoks\macname % Macro name -\newif\ifrecursive % Is it recursive? - -% List of all defined macros in the form -% \definedummyword\macro1\definedummyword\macro2... -% Currently is also contains all @aliases; the list can be split -% if there is a need. -\def\macrolist{} - -% Add the macro to \macrolist -\def\addtomacrolist#1{\expandafter \addtomacrolistxxx \csname#1\endcsname} -\def\addtomacrolistxxx#1{% - \toks0 = \expandafter{\macrolist\definedummyword#1}% - \xdef\macrolist{\the\toks0}% -} - -% Utility routines. -% This does \let #1 = #2, with \csnames; that is, -% \let \csname#1\endcsname = \csname#2\endcsname -% (except of course we have to play expansion games). -% -\def\cslet#1#2{% - \expandafter\let - \csname#1\expandafter\endcsname - \csname#2\endcsname -} - -% Trim leading and trailing spaces off a string. -% Concepts from aro-bend problem 15 (see CTAN). -{\catcode`\@=11 -\gdef\eatspaces #1{\expandafter\trim@\expandafter{#1 }} -\gdef\trim@ #1{\trim@@ @#1 @ #1 @ @@} -\gdef\trim@@ #1@ #2@ #3@@{\trim@@@\empty #2 @} -\def\unbrace#1{#1} -\unbrace{\gdef\trim@@@ #1 } #2@{#1} -} - -% Trim a single trailing ^^M off a string. -{\catcode`\^^M=\other \catcode`\Q=3% -\gdef\eatcr #1{\eatcra #1Q^^MQ}% -\gdef\eatcra#1^^MQ{\eatcrb#1Q}% -\gdef\eatcrb#1Q#2Q{#1}% -} - -% Macro bodies are absorbed as an argument in a context where -% all characters are catcode 10, 11 or 12, except \ which is active -% (as in normal texinfo). It is necessary to change the definition of \. - -% It's necessary to have hard CRs when the macro is executed. This is -% done by making ^^M (\endlinechar) catcode 12 when reading the macro -% body, and then making it the \newlinechar in \scanmacro. - -\def\scanctxt{% - \catcode`\"=\other - \catcode`\+=\other - \catcode`\<=\other - \catcode`\>=\other - \catcode`\@=\other - \catcode`\^=\other - \catcode`\_=\other - \catcode`\|=\other - \catcode`\~=\other -} - -\def\scanargctxt{% - \scanctxt - \catcode`\\=\other - \catcode`\^^M=\other -} - -\def\macrobodyctxt{% - \scanctxt - \catcode`\{=\other - \catcode`\}=\other - \catcode`\^^M=\other - \usembodybackslash -} - -\def\macroargctxt{% - \scanctxt - \catcode`\\=\other -} - -% \mbodybackslash is the definition of \ in @macro bodies. -% It maps \foo\ => \csname macarg.foo\endcsname => #N -% where N is the macro parameter number. -% We define \csname macarg.\endcsname to be \realbackslash, so -% \\ in macro replacement text gets you a backslash. - -{\catcode`@=0 @catcode`@\=@active - @gdef@usembodybackslash{@let\=@mbodybackslash} - @gdef@mbodybackslash#1\{@csname macarg.#1@endcsname} -} -\expandafter\def\csname macarg.\endcsname{\realbackslash} - -\def\macro{\recursivefalse\parsearg\macroxxx} -\def\rmacro{\recursivetrue\parsearg\macroxxx} - -\def\macroxxx#1{% - \getargs{#1}% now \macname is the macname and \argl the arglist - \ifx\argl\empty % no arguments - \paramno=0% - \else - \expandafter\parsemargdef \argl;% - \fi - \if1\csname ismacro.\the\macname\endcsname - \message{Warning: redefining \the\macname}% - \else - \expandafter\ifx\csname \the\macname\endcsname \relax - \else \errmessage{Macro name \the\macname\space already defined}\fi - \global\cslet{macsave.\the\macname}{\the\macname}% - \global\expandafter\let\csname ismacro.\the\macname\endcsname=1% - \addtomacrolist{\the\macname}% - \fi - \begingroup \macrobodyctxt - \ifrecursive \expandafter\parsermacbody - \else \expandafter\parsemacbody - \fi} - -\parseargdef\unmacro{% - \if1\csname ismacro.#1\endcsname - \global\cslet{#1}{macsave.#1}% - \global\expandafter\let \csname ismacro.#1\endcsname=0% - % Remove the macro name from \macrolist: - \begingroup - \expandafter\let\csname#1\endcsname \relax - \let\definedummyword\unmacrodo - \xdef\macrolist{\macrolist}% - \endgroup - \else - \errmessage{Macro #1 not defined}% - \fi -} - -% Called by \do from \dounmacro on each macro. The idea is to omit any -% macro definitions that have been changed to \relax. -% -\def\unmacrodo#1{% - \ifx #1\relax - % remove this - \else - \noexpand\definedummyword \noexpand#1% - \fi -} - -% This makes use of the obscure feature that if the last token of a -% <parameter list> is #, then the preceding argument is delimited by -% an opening brace, and that opening brace is not consumed. -\def\getargs#1{\getargsxxx#1{}} -\def\getargsxxx#1#{\getmacname #1 \relax\getmacargs} -\def\getmacname #1 #2\relax{\macname={#1}} -\def\getmacargs#1{\def\argl{#1}} - -% Parse the optional {params} list. Set up \paramno and \paramlist -% so \defmacro knows what to do. Define \macarg.blah for each blah -% in the params list, to be ##N where N is the position in that list. -% That gets used by \mbodybackslash (above). - -% We need to get `macro parameter char #' into several definitions. -% The technique used is stolen from LaTeX: let \hash be something -% unexpandable, insert that wherever you need a #, and then redefine -% it to # just before using the token list produced. -% -% The same technique is used to protect \eatspaces till just before -% the macro is used. - -\def\parsemargdef#1;{\paramno=0\def\paramlist{}% - \let\hash\relax\let\xeatspaces\relax\parsemargdefxxx#1,;,} -\def\parsemargdefxxx#1,{% - \if#1;\let\next=\relax - \else \let\next=\parsemargdefxxx - \advance\paramno by 1% - \expandafter\edef\csname macarg.\eatspaces{#1}\endcsname - {\xeatspaces{\hash\the\paramno}}% - \edef\paramlist{\paramlist\hash\the\paramno,}% - \fi\next} - -% These two commands read recursive and nonrecursive macro bodies. -% (They're different since rec and nonrec macros end differently.) - -\long\def\parsemacbody#1@end macro% -{\xdef\temp{\eatcr{#1}}\endgroup\defmacro}% -\long\def\parsermacbody#1@end rmacro% -{\xdef\temp{\eatcr{#1}}\endgroup\defmacro}% - -% This defines the macro itself. There are six cases: recursive and -% nonrecursive macros of zero, one, and many arguments. -% Much magic with \expandafter here. -% \xdef is used so that macro definitions will survive the file -% they're defined in; @include reads the file inside a group. -\def\defmacro{% - \let\hash=##% convert placeholders to macro parameter chars - \ifrecursive - \ifcase\paramno - % 0 - \expandafter\xdef\csname\the\macname\endcsname{% - \noexpand\scanmacro{\temp}}% - \or % 1 - \expandafter\xdef\csname\the\macname\endcsname{% - \bgroup\noexpand\macroargctxt - \noexpand\braceorline - \expandafter\noexpand\csname\the\macname xxx\endcsname}% - \expandafter\xdef\csname\the\macname xxx\endcsname##1{% - \egroup\noexpand\scanmacro{\temp}}% - \else % many - \expandafter\xdef\csname\the\macname\endcsname{% - \bgroup\noexpand\macroargctxt - \noexpand\csname\the\macname xx\endcsname}% - \expandafter\xdef\csname\the\macname xx\endcsname##1{% - \expandafter\noexpand\csname\the\macname xxx\endcsname ##1,}% - \expandafter\expandafter - \expandafter\xdef - \expandafter\expandafter - \csname\the\macname xxx\endcsname - \paramlist{\egroup\noexpand\scanmacro{\temp}}% - \fi - \else - \ifcase\paramno - % 0 - \expandafter\xdef\csname\the\macname\endcsname{% - \noexpand\norecurse{\the\macname}% - \noexpand\scanmacro{\temp}\egroup}% - \or % 1 - \expandafter\xdef\csname\the\macname\endcsname{% - \bgroup\noexpand\macroargctxt - \noexpand\braceorline - \expandafter\noexpand\csname\the\macname xxx\endcsname}% - \expandafter\xdef\csname\the\macname xxx\endcsname##1{% - \egroup - \noexpand\norecurse{\the\macname}% - \noexpand\scanmacro{\temp}\egroup}% - \else % many - \expandafter\xdef\csname\the\macname\endcsname{% - \bgroup\noexpand\macroargctxt - \expandafter\noexpand\csname\the\macname xx\endcsname}% - \expandafter\xdef\csname\the\macname xx\endcsname##1{% - \expandafter\noexpand\csname\the\macname xxx\endcsname ##1,}% - \expandafter\expandafter - \expandafter\xdef - \expandafter\expandafter - \csname\the\macname xxx\endcsname - \paramlist{% - \egroup - \noexpand\norecurse{\the\macname}% - \noexpand\scanmacro{\temp}\egroup}% - \fi - \fi} - -\def\norecurse#1{\bgroup\cslet{#1}{macsave.#1}} - -% \braceorline decides whether the next nonwhitespace character is a -% {. If so it reads up to the closing }, if not, it reads the whole -% line. Whatever was read is then fed to the next control sequence -% as an argument (by \parsebrace or \parsearg) -\def\braceorline#1{\let\next=#1\futurelet\nchar\braceorlinexxx} -\def\braceorlinexxx{% - \ifx\nchar\bgroup\else - \expandafter\parsearg - \fi \next} - - -% @alias. -% We need some trickery to remove the optional spaces around the equal -% sign. Just make them active and then expand them all to nothing. -\def\alias{\parseargusing\obeyspaces\aliasxxx} -\def\aliasxxx #1{\aliasyyy#1\relax} -\def\aliasyyy #1=#2\relax{% - {% - \expandafter\let\obeyedspace=\empty - \addtomacrolist{#1}% - \xdef\next{\global\let\makecsname{#1}=\makecsname{#2}}% - }% - \next -} - - -\message{cross references,} - -\newwrite\auxfile - -\newif\ifhavexrefs % True if xref values are known. -\newif\ifwarnedxrefs % True if we warned once that they aren't known. - -% @inforef is relatively simple. -\def\inforef #1{\inforefzzz #1,,,,**} -\def\inforefzzz #1,#2,#3,#4**{\putwordSee{} \putwordInfo{} \putwordfile{} \file{\ignorespaces #3{}}, - node \samp{\ignorespaces#1{}}} - -% @node's only job in TeX is to define \lastnode, which is used in -% cross-references. The @node line might or might not have commas, and -% might or might not have spaces before the first comma, like: -% @node foo , bar , ... -% We don't want such trailing spaces in the node name. -% -\parseargdef\node{\checkenv{}\donode #1 ,\finishnodeparse} -% -% also remove a trailing comma, in case of something like this: -% @node Help-Cross, , , Cross-refs -\def\donode#1 ,#2\finishnodeparse{\dodonode #1,\finishnodeparse} -\def\dodonode#1,#2\finishnodeparse{\gdef\lastnode{#1}} - -\let\nwnode=\node -\let\lastnode=\empty - -% Write a cross-reference definition for the current node. #1 is the -% type (Ynumbered, Yappendix, Ynothing). -% -\def\donoderef#1{% - \ifx\lastnode\empty\else - \setref{\lastnode}{#1}% - \global\let\lastnode=\empty - \fi -} - -% @anchor{NAME} -- define xref target at arbitrary point. -% -\newcount\savesfregister -% -\def\savesf{\relax \ifhmode \savesfregister=\spacefactor \fi} -\def\restoresf{\relax \ifhmode \spacefactor=\savesfregister \fi} -\def\anchor#1{\savesf \setref{#1}{Ynothing}\restoresf \ignorespaces} - -% \setref{NAME}{SNT} defines a cross-reference point NAME (a node or an -% anchor), which consists of three parts: -% 1) NAME-title - the current sectioning name taken from \thissection, -% or the anchor name. -% 2) NAME-snt - section number and type, passed as the SNT arg, or -% empty for anchors. -% 3) NAME-pg - the page number. -% -% This is called from \donoderef, \anchor, and \dofloat. In the case of -% floats, there is an additional part, which is not written here: -% 4) NAME-lof - the text as it should appear in a @listoffloats. -% -\def\setref#1#2{% - \pdfmkdest{#1}% - \iflinks - {% - \atdummies % preserve commands, but don't expand them - \edef\writexrdef##1##2{% - \write\auxfile{@xrdef{#1-% #1 of \setref, expanded by the \edef - ##1}{##2}}% these are parameters of \writexrdef - }% - \toks0 = \expandafter{\thissection}% - \immediate \writexrdef{title}{\the\toks0 }% - \immediate \writexrdef{snt}{\csname #2\endcsname}% \Ynumbered etc. - \writexrdef{pg}{\folio}% will be written later, during \shipout - }% - \fi -} - -% @xref, @pxref, and @ref generate cross-references. For \xrefX, #1 is -% the node name, #2 the name of the Info cross-reference, #3 the printed -% node name, #4 the name of the Info file, #5 the name of the printed -% manual. All but the node name can be omitted. -% -\def\pxref#1{\putwordsee{} \xrefX[#1,,,,,,,]} -\def\xref#1{\putwordSee{} \xrefX[#1,,,,,,,]} -\def\ref#1{\xrefX[#1,,,,,,,]} -\def\xrefX[#1,#2,#3,#4,#5,#6]{\begingroup - \unsepspaces - \def\printedmanual{\ignorespaces #5}% - \def\printedrefname{\ignorespaces #3}% - \setbox1=\hbox{\printedmanual\unskip}% - \setbox0=\hbox{\printedrefname\unskip}% - \ifdim \wd0 = 0pt - % No printed node name was explicitly given. - \expandafter\ifx\csname SETxref-automatic-section-title\endcsname\relax - % Use the node name inside the square brackets. - \def\printedrefname{\ignorespaces #1}% - \else - % Use the actual chapter/section title appear inside - % the square brackets. Use the real section title if we have it. - \ifdim \wd1 > 0pt - % It is in another manual, so we don't have it. - \def\printedrefname{\ignorespaces #1}% - \else - \ifhavexrefs - % We know the real title if we have the xref values. - \def\printedrefname{\refx{#1-title}{}}% - \else - % Otherwise just copy the Info node name. - \def\printedrefname{\ignorespaces #1}% - \fi% - \fi - \fi - \fi - % - % Make link in pdf output. - \ifpdf - \leavevmode - \getfilename{#4}% - {\turnoffactive - % See comments at \activebackslashdouble. - {\activebackslashdouble \xdef\pdfxrefdest{#1}% - \backslashparens\pdfxrefdest}% - % - \ifnum\filenamelength>0 - \startlink attr{/Border [0 0 0]}% - goto file{\the\filename.pdf} name{\pdfxrefdest}% - \else - \startlink attr{/Border [0 0 0]}% - goto name{\pdfmkpgn{\pdfxrefdest}}% - \fi - }% - \linkcolor - \fi - % - % Float references are printed completely differently: "Figure 1.2" - % instead of "[somenode], p.3". We distinguish them by the - % LABEL-title being set to a magic string. - {% - % Have to otherify everything special to allow the \csname to - % include an _ in the xref name, etc. - \indexnofonts - \turnoffactive - \expandafter\global\expandafter\let\expandafter\Xthisreftitle - \csname XR#1-title\endcsname - }% - \iffloat\Xthisreftitle - % If the user specified the print name (third arg) to the ref, - % print it instead of our usual "Figure 1.2". - \ifdim\wd0 = 0pt - \refx{#1-snt}% - \else - \printedrefname - \fi - % - % if the user also gave the printed manual name (fifth arg), append - % "in MANUALNAME". - \ifdim \wd1 > 0pt - \space \putwordin{} \cite{\printedmanual}% - \fi - \else - % node/anchor (non-float) references. - % - % If we use \unhbox0 and \unhbox1 to print the node names, TeX does not - % insert empty discretionaries after hyphens, which means that it will - % not find a line break at a hyphen in a node names. Since some manuals - % are best written with fairly long node names, containing hyphens, this - % is a loss. Therefore, we give the text of the node name again, so it - % is as if TeX is seeing it for the first time. - \ifdim \wd1 > 0pt - \putwordsection{} ``\printedrefname'' \putwordin{} \cite{\printedmanual}% - \else - % _ (for example) has to be the character _ for the purposes of the - % control sequence corresponding to the node, but it has to expand - % into the usual \leavevmode...\vrule stuff for purposes of - % printing. So we \turnoffactive for the \refx-snt, back on for the - % printing, back off for the \refx-pg. - {\turnoffactive - % Only output a following space if the -snt ref is nonempty; for - % @unnumbered and @anchor, it won't be. - \setbox2 = \hbox{\ignorespaces \refx{#1-snt}{}}% - \ifdim \wd2 > 0pt \refx{#1-snt}\space\fi - }% - % output the `[mynode]' via a macro so it can be overridden. - \xrefprintnodename\printedrefname - % - % But we always want a comma and a space: - ,\space - % - % output the `page 3'. - \turnoffactive \putwordpage\tie\refx{#1-pg}{}% - \fi - \fi - \endlink -\endgroup} - -% This macro is called from \xrefX for the `[nodename]' part of xref -% output. It's a separate macro only so it can be changed more easily, -% since square brackets don't work well in some documents. Particularly -% one that Bob is working on :). -% -\def\xrefprintnodename#1{[#1]} - -% Things referred to by \setref. -% -\def\Ynothing{} -\def\Yomitfromtoc{} -\def\Ynumbered{% - \ifnum\secno=0 - \putwordChapter@tie \the\chapno - \else \ifnum\subsecno=0 - \putwordSection@tie \the\chapno.\the\secno - \else \ifnum\subsubsecno=0 - \putwordSection@tie \the\chapno.\the\secno.\the\subsecno - \else - \putwordSection@tie \the\chapno.\the\secno.\the\subsecno.\the\subsubsecno - \fi\fi\fi -} -\def\Yappendix{% - \ifnum\secno=0 - \putwordAppendix@tie @char\the\appendixno{}% - \else \ifnum\subsecno=0 - \putwordSection@tie @char\the\appendixno.\the\secno - \else \ifnum\subsubsecno=0 - \putwordSection@tie @char\the\appendixno.\the\secno.\the\subsecno - \else - \putwordSection@tie - @char\the\appendixno.\the\secno.\the\subsecno.\the\subsubsecno - \fi\fi\fi -} - -% Define \refx{NAME}{SUFFIX} to reference a cross-reference string named NAME. -% If its value is nonempty, SUFFIX is output afterward. -% -\def\refx#1#2{% - {% - \indexnofonts - \otherbackslash - \expandafter\global\expandafter\let\expandafter\thisrefX - \csname XR#1\endcsname - }% - \ifx\thisrefX\relax - % If not defined, say something at least. - \angleleft un\-de\-fined\angleright - \iflinks - \ifhavexrefs - \message{\linenumber Undefined cross reference `#1'.}% - \else - \ifwarnedxrefs\else - \global\warnedxrefstrue - \message{Cross reference values unknown; you must run TeX again.}% - \fi - \fi - \fi - \else - % It's defined, so just use it. - \thisrefX - \fi - #2% Output the suffix in any case. -} - -% This is the macro invoked by entries in the aux file. Usually it's -% just a \def (we prepend XR to the control sequence name to avoid -% collisions). But if this is a float type, we have more work to do. -% -\def\xrdef#1#2{% - \expandafter\gdef\csname XR#1\endcsname{#2}% remember this xref value. - % - % Was that xref control sequence that we just defined for a float? - \expandafter\iffloat\csname XR#1\endcsname - % it was a float, and we have the (safe) float type in \iffloattype. - \expandafter\let\expandafter\floatlist - \csname floatlist\iffloattype\endcsname - % - % Is this the first time we've seen this float type? - \expandafter\ifx\floatlist\relax - \toks0 = {\do}% yes, so just \do - \else - % had it before, so preserve previous elements in list. - \toks0 = \expandafter{\floatlist\do}% - \fi - % - % Remember this xref in the control sequence \floatlistFLOATTYPE, - % for later use in \listoffloats. - \expandafter\xdef\csname floatlist\iffloattype\endcsname{\the\toks0{#1}}% - \fi -} - -% Read the last existing aux file, if any. No error if none exists. -% -\def\tryauxfile{% - \openin 1 \jobname.aux - \ifeof 1 \else - \readdatafile{aux}% - \global\havexrefstrue - \fi - \closein 1 -} - -\def\setupdatafile{% - \catcode`\^^@=\other - \catcode`\^^A=\other - \catcode`\^^B=\other - \catcode`\^^C=\other - \catcode`\^^D=\other - \catcode`\^^E=\other - \catcode`\^^F=\other - \catcode`\^^G=\other - \catcode`\^^H=\other - \catcode`\^^K=\other - \catcode`\^^L=\other - \catcode`\^^N=\other - \catcode`\^^P=\other - \catcode`\^^Q=\other - \catcode`\^^R=\other - \catcode`\^^S=\other - \catcode`\^^T=\other - \catcode`\^^U=\other - \catcode`\^^V=\other - \catcode`\^^W=\other - \catcode`\^^X=\other - \catcode`\^^Z=\other - \catcode`\^^[=\other - \catcode`\^^\=\other - \catcode`\^^]=\other - \catcode`\^^^=\other - \catcode`\^^_=\other - % It was suggested to set the catcode of ^ to 7, which would allow ^^e4 etc. - % in xref tags, i.e., node names. But since ^^e4 notation isn't - % supported in the main text, it doesn't seem desirable. Furthermore, - % that is not enough: for node names that actually contain a ^ - % character, we would end up writing a line like this: 'xrdef {'hat - % b-title}{'hat b} and \xrdef does a \csname...\endcsname on the first - % argument, and \hat is not an expandable control sequence. It could - % all be worked out, but why? Either we support ^^ or we don't. - % - % The other change necessary for this was to define \auxhat: - % \def\auxhat{\def^{'hat }}% extra space so ok if followed by letter - % and then to call \auxhat in \setq. - % - \catcode`\^=\other - % - % Special characters. Should be turned off anyway, but... - \catcode`\~=\other - \catcode`\[=\other - \catcode`\]=\other - \catcode`\"=\other - \catcode`\_=\other - \catcode`\|=\other - \catcode`\<=\other - \catcode`\>=\other - \catcode`\$=\other - \catcode`\#=\other - \catcode`\&=\other - \catcode`\%=\other - \catcode`+=\other % avoid \+ for paranoia even though we've turned it off - % - % This is to support \ in node names and titles, since the \ - % characters end up in a \csname. It's easier than - % leaving it active and making its active definition an actual \ - % character. What I don't understand is why it works in the *value* - % of the xrdef. Seems like it should be a catcode12 \, and that - % should not typeset properly. But it works, so I'm moving on for - % now. --karl, 15jan04. - \catcode`\\=\other - % - % Make the characters 128-255 be printing characters. - {% - \count1=128 - \def\loop{% - \catcode\count1=\other - \advance\count1 by 1 - \ifnum \count1<256 \loop \fi - }% - }% - % - % @ is our escape character in .aux files, and we need braces. - \catcode`\{=1 - \catcode`\}=2 - \catcode`\@=0 -} - -\def\readdatafile#1{% -\begingroup - \setupdatafile - \input\jobname.#1 -\endgroup} - -\message{insertions,} -% including footnotes. - -\newcount \footnoteno - -% The trailing space in the following definition for supereject is -% vital for proper filling; pages come out unaligned when you do a -% pagealignmacro call if that space before the closing brace is -% removed. (Generally, numeric constants should always be followed by a -% space to prevent strange expansion errors.) -\def\supereject{\par\penalty -20000\footnoteno =0 } - -% @footnotestyle is meaningful for info output only. -\let\footnotestyle=\comment - -{\catcode `\@=11 -% -% Auto-number footnotes. Otherwise like plain. -\gdef\footnote{% - \let\indent=\ptexindent - \let\noindent=\ptexnoindent - \global\advance\footnoteno by \@ne - \edef\thisfootno{$^{\the\footnoteno}$}% - % - % In case the footnote comes at the end of a sentence, preserve the - % extra spacing after we do the footnote number. - \let\@sf\empty - \ifhmode\edef\@sf{\spacefactor\the\spacefactor}\ptexslash\fi - % - % Remove inadvertent blank space before typesetting the footnote number. - \unskip - \thisfootno\@sf - \dofootnote -}% - -% Don't bother with the trickery in plain.tex to not require the -% footnote text as a parameter. Our footnotes don't need to be so general. -% -% Oh yes, they do; otherwise, @ifset (and anything else that uses -% \parseargline) fails inside footnotes because the tokens are fixed when -% the footnote is read. --karl, 16nov96. -% -\gdef\dofootnote{% - \insert\footins\bgroup - % We want to typeset this text as a normal paragraph, even if the - % footnote reference occurs in (for example) a display environment. - % So reset some parameters. - \hsize=\pagewidth - \interlinepenalty\interfootnotelinepenalty - \splittopskip\ht\strutbox % top baseline for broken footnotes - \splitmaxdepth\dp\strutbox - \floatingpenalty\@MM - \leftskip\z@skip - \rightskip\z@skip - \spaceskip\z@skip - \xspaceskip\z@skip - \parindent\defaultparindent - % - \smallfonts \rm - % - % Because we use hanging indentation in footnotes, a @noindent appears - % to exdent this text, so make it be a no-op. makeinfo does not use - % hanging indentation so @noindent can still be needed within footnote - % text after an @example or the like (not that this is good style). - \let\noindent = \relax - % - % Hang the footnote text off the number. Use \everypar in case the - % footnote extends for more than one paragraph. - \everypar = {\hang}% - \textindent{\thisfootno}% - % - % Don't crash into the line above the footnote text. Since this - % expands into a box, it must come within the paragraph, lest it - % provide a place where TeX can split the footnote. - \footstrut - \futurelet\next\fo@t -} -}%end \catcode `\@=11 - -% In case a @footnote appears in a vbox, save the footnote text and create -% the real \insert just after the vbox finished. Otherwise, the insertion -% would be lost. -% Similarily, if a @footnote appears inside an alignment, save the footnote -% text to a box and make the \insert when a row of the table is finished. -% And the same can be done for other insert classes. --kasal, 16nov03. - -% Replace the \insert primitive by a cheating macro. -% Deeper inside, just make sure that the saved insertions are not spilled -% out prematurely. -% -\def\startsavinginserts{% - \ifx \insert\ptexinsert - \let\insert\saveinsert - \else - \let\checkinserts\relax - \fi -} - -% This \insert replacement works for both \insert\footins{foo} and -% \insert\footins\bgroup foo\egroup, but it doesn't work for \insert27{foo}. -% -\def\saveinsert#1{% - \edef\next{\noexpand\savetobox \makeSAVEname#1}% - \afterassignment\next - % swallow the left brace - \let\temp = -} -\def\makeSAVEname#1{\makecsname{SAVE\expandafter\gobble\string#1}} -\def\savetobox#1{\global\setbox#1 = \vbox\bgroup \unvbox#1} - -\def\checksaveins#1{\ifvoid#1\else \placesaveins#1\fi} - -\def\placesaveins#1{% - \ptexinsert \csname\expandafter\gobblesave\string#1\endcsname - {\box#1}% -} - -% eat @SAVE -- beware, all of them have catcode \other: -{ - \def\dospecials{\do S\do A\do V\do E} \uncatcodespecials % ;-) - \gdef\gobblesave @SAVE{} -} - -% initialization: -\def\newsaveins #1{% - \edef\next{\noexpand\newsaveinsX \makeSAVEname#1}% - \next -} -\def\newsaveinsX #1{% - \csname newbox\endcsname #1% - \expandafter\def\expandafter\checkinserts\expandafter{\checkinserts - \checksaveins #1}% -} - -% initialize: -\let\checkinserts\empty -\newsaveins\footins -\newsaveins\margin - - -% @image. We use the macros from epsf.tex to support this. -% If epsf.tex is not installed and @image is used, we complain. -% -% Check for and read epsf.tex up front. If we read it only at @image -% time, we might be inside a group, and then its definitions would get -% undone and the next image would fail. -\openin 1 = epsf.tex -\ifeof 1 \else - % Do not bother showing banner with epsf.tex v2.7k (available in - % doc/epsf.tex and on ctan). - \def\epsfannounce{\toks0 = }% - \input epsf.tex -\fi -\closein 1 -% -% We will only complain once about lack of epsf.tex. -\newif\ifwarnednoepsf -\newhelp\noepsfhelp{epsf.tex must be installed for images to - work. It is also included in the Texinfo distribution, or you can get - it from ftp://tug.org/tex/epsf.tex.} -% -\def\image#1{% - \ifx\epsfbox\undefined - \ifwarnednoepsf \else - \errhelp = \noepsfhelp - \errmessage{epsf.tex not found, images will be ignored}% - \global\warnednoepsftrue - \fi - \else - \imagexxx #1,,,,,\finish - \fi -} -% -% Arguments to @image: -% #1 is (mandatory) image filename; we tack on .eps extension. -% #2 is (optional) width, #3 is (optional) height. -% #4 is (ignored optional) html alt text. -% #5 is (ignored optional) extension. -% #6 is just the usual extra ignored arg for parsing this stuff. -\newif\ifimagevmode -\def\imagexxx#1,#2,#3,#4,#5,#6\finish{\begingroup - \catcode`\^^M = 5 % in case we're inside an example - \normalturnoffactive % allow _ et al. in names - % If the image is by itself, center it. - \ifvmode - \imagevmodetrue - \nobreak\bigskip - % Usually we'll have text after the image which will insert - % \parskip glue, so insert it here too to equalize the space - % above and below. - \nobreak\vskip\parskip - \nobreak - \line\bgroup\hss - \fi - % - % Output the image. - \ifpdf - \dopdfimage{#1}{#2}{#3}% - \else - % \epsfbox itself resets \epsf?size at each figure. - \setbox0 = \hbox{\ignorespaces #2}\ifdim\wd0 > 0pt \epsfxsize=#2\relax \fi - \setbox0 = \hbox{\ignorespaces #3}\ifdim\wd0 > 0pt \epsfysize=#3\relax \fi - \epsfbox{#1.eps}% - \fi - % - \ifimagevmode \hss \egroup \bigbreak \fi % space after the image -\endgroup} - - -% @float FLOATTYPE,LABEL,LOC ... @end float for displayed figures, tables, -% etc. We don't actually implement floating yet, we always include the -% float "here". But it seemed the best name for the future. -% -\envparseargdef\float{\eatcommaspace\eatcommaspace\dofloat#1, , ,\finish} - -% There may be a space before second and/or third parameter; delete it. -\def\eatcommaspace#1, {#1,} - -% #1 is the optional FLOATTYPE, the text label for this float, typically -% "Figure", "Table", "Example", etc. Can't contain commas. If omitted, -% this float will not be numbered and cannot be referred to. -% -% #2 is the optional xref label. Also must be present for the float to -% be referable. -% -% #3 is the optional positioning argument; for now, it is ignored. It -% will somehow specify the positions allowed to float to (here, top, bottom). -% -% We keep a separate counter for each FLOATTYPE, which we reset at each -% chapter-level command. -\let\resetallfloatnos=\empty -% -\def\dofloat#1,#2,#3,#4\finish{% - \let\thiscaption=\empty - \let\thisshortcaption=\empty - % - % don't lose footnotes inside @float. - % - % BEWARE: when the floats start float, we have to issue warning whenever an - % insert appears inside a float which could possibly float. --kasal, 26may04 - % - \startsavinginserts - % - % We can't be used inside a paragraph. - \par - % - \vtop\bgroup - \def\floattype{#1}% - \def\floatlabel{#2}% - \def\floatloc{#3}% we do nothing with this yet. - % - \ifx\floattype\empty - \let\safefloattype=\empty - \else - {% - % the floattype might have accents or other special characters, - % but we need to use it in a control sequence name. - \indexnofonts - \turnoffactive - \xdef\safefloattype{\floattype}% - }% - \fi - % - % If label is given but no type, we handle that as the empty type. - \ifx\floatlabel\empty \else - % We want each FLOATTYPE to be numbered separately (Figure 1, - % Table 1, Figure 2, ...). (And if no label, no number.) - % - \expandafter\getfloatno\csname\safefloattype floatno\endcsname - \global\advance\floatno by 1 - % - {% - % This magic value for \thissection is output by \setref as the - % XREFLABEL-title value. \xrefX uses it to distinguish float - % labels (which have a completely different output format) from - % node and anchor labels. And \xrdef uses it to construct the - % lists of floats. - % - \edef\thissection{\floatmagic=\safefloattype}% - \setref{\floatlabel}{Yfloat}% - }% - \fi - % - % start with \parskip glue, I guess. - \vskip\parskip - % - % Don't suppress indentation if a float happens to start a section. - \restorefirstparagraphindent -} - -% we have these possibilities: -% @float Foo,lbl & @caption{Cap}: Foo 1.1: Cap -% @float Foo,lbl & no caption: Foo 1.1 -% @float Foo & @caption{Cap}: Foo: Cap -% @float Foo & no caption: Foo -% @float ,lbl & Caption{Cap}: 1.1: Cap -% @float ,lbl & no caption: 1.1 -% @float & @caption{Cap}: Cap -% @float & no caption: -% -\def\Efloat{% - \let\floatident = \empty - % - % In all cases, if we have a float type, it comes first. - \ifx\floattype\empty \else \def\floatident{\floattype}\fi - % - % If we have an xref label, the number comes next. - \ifx\floatlabel\empty \else - \ifx\floattype\empty \else % if also had float type, need tie first. - \appendtomacro\floatident{\tie}% - \fi - % the number. - \appendtomacro\floatident{\chaplevelprefix\the\floatno}% - \fi - % - % Start the printed caption with what we've constructed in - % \floatident, but keep it separate; we need \floatident again. - \let\captionline = \floatident - % - \ifx\thiscaption\empty \else - \ifx\floatident\empty \else - \appendtomacro\captionline{: }% had ident, so need a colon between - \fi - % - % caption text. - \appendtomacro\captionline{\scanexp\thiscaption}% - \fi - % - % If we have anything to print, print it, with space before. - % Eventually this needs to become an \insert. - \ifx\captionline\empty \else - \vskip.5\parskip - \captionline - % - % Space below caption. - \vskip\parskip - \fi - % - % If have an xref label, write the list of floats info. Do this - % after the caption, to avoid chance of it being a breakpoint. - \ifx\floatlabel\empty \else - % Write the text that goes in the lof to the aux file as - % \floatlabel-lof. Besides \floatident, we include the short - % caption if specified, else the full caption if specified, else nothing. - {% - \atdummies - % since we read the caption text in the macro world, where ^^M - % is turned into a normal character, we have to scan it back, so - % we don't write the literal three characters "^^M" into the aux file. - \scanexp{% - \xdef\noexpand\gtemp{% - \ifx\thisshortcaption\empty - \thiscaption - \else - \thisshortcaption - \fi - }% - }% - \immediate\write\auxfile{@xrdef{\floatlabel-lof}{\floatident - \ifx\gtemp\empty \else : \gtemp \fi}}% - }% - \fi - \egroup % end of \vtop - % - % place the captured inserts - % - % BEWARE: when the floats start float, we have to issue warning whenever an - % insert appears inside a float which could possibly float. --kasal, 26may04 - % - \checkinserts -} - -% Append the tokens #2 to the definition of macro #1, not expanding either. -% -\def\appendtomacro#1#2{% - \expandafter\def\expandafter#1\expandafter{#1#2}% -} - -% @caption, @shortcaption -% -\def\caption{\docaption\thiscaption} -\def\shortcaption{\docaption\thisshortcaption} -\def\docaption{\checkenv\float \bgroup\scanargctxt\defcaption} -\def\defcaption#1#2{\egroup \def#1{#2}} - -% The parameter is the control sequence identifying the counter we are -% going to use. Create it if it doesn't exist and assign it to \floatno. -\def\getfloatno#1{% - \ifx#1\relax - % Haven't seen this figure type before. - \csname newcount\endcsname #1% - % - % Remember to reset this floatno at the next chap. - \expandafter\gdef\expandafter\resetallfloatnos - \expandafter{\resetallfloatnos #1=0 }% - \fi - \let\floatno#1% -} - -% \setref calls this to get the XREFLABEL-snt value. We want an @xref -% to the FLOATLABEL to expand to "Figure 3.1". We call \setref when we -% first read the @float command. -% -\def\Yfloat{\floattype@tie \chaplevelprefix\the\floatno}% - -% Magic string used for the XREFLABEL-title value, so \xrefX can -% distinguish floats from other xref types. -\def\floatmagic{!!float!!} - -% #1 is the control sequence we are passed; we expand into a conditional -% which is true if #1 represents a float ref. That is, the magic -% \thissection value which we \setref above. -% -\def\iffloat#1{\expandafter\doiffloat#1==\finish} -% -% #1 is (maybe) the \floatmagic string. If so, #2 will be the -% (safe) float type for this float. We set \iffloattype to #2. -% -\def\doiffloat#1=#2=#3\finish{% - \def\temp{#1}% - \def\iffloattype{#2}% - \ifx\temp\floatmagic -} - -% @listoffloats FLOATTYPE - print a list of floats like a table of contents. -% -\parseargdef\listoffloats{% - \def\floattype{#1}% floattype - {% - % the floattype might have accents or other special characters, - % but we need to use it in a control sequence name. - \indexnofonts - \turnoffactive - \xdef\safefloattype{\floattype}% - }% - % - % \xrdef saves the floats as a \do-list in \floatlistSAFEFLOATTYPE. - \expandafter\ifx\csname floatlist\safefloattype\endcsname \relax - \ifhavexrefs - % if the user said @listoffloats foo but never @float foo. - \message{\linenumber No `\safefloattype' floats to list.}% - \fi - \else - \begingroup - \leftskip=\tocindent % indent these entries like a toc - \let\do=\listoffloatsdo - \csname floatlist\safefloattype\endcsname - \endgroup - \fi -} - -% This is called on each entry in a list of floats. 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Then - % do the same for \bindingoffset. 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Or perhaps we should compute them somehow. -% -\parseargdef\pagesizes{\pagesizesyyy #1,,\finish} -\def\pagesizesyyy#1,#2,#3\finish{{% - \setbox0 = \hbox{\ignorespaces #2}\ifdim\wd0 > 0pt \hsize=#2\relax \fi - \globaldefs = 1 - % - \parskip = 3pt plus 2pt minus 1pt - \setleading{\textleading}% - % - \dimen0 = #1 - \advance\dimen0 by \voffset - % - \dimen2 = \hsize - \advance\dimen2 by \normaloffset - % - \internalpagesizes{#1}{\hsize}% - {\voffset}{\normaloffset}% - {\bindingoffset}{44pt}% - {\dimen0}{\dimen2}% -}} - -% Set default to letter. -% -\letterpaper - - -\message{and turning on texinfo input format.} - -% Define macros to output various characters with catcode for normal text. -\catcode`\"=\other -\catcode`\~=\other -\catcode`\^=\other -\catcode`\_=\other -\catcode`\|=\other -\catcode`\<=\other -\catcode`\>=\other -\catcode`\+=\other -\catcode`\$=\other -\def\normaldoublequote{"} -\def\normaltilde{~} -\def\normalcaret{^} -\def\normalunderscore{_} -\def\normalverticalbar{|} -\def\normalless{<} -\def\normalgreater{>} -\def\normalplus{+} -\def\normaldollar{$}%$ font-lock fix - -% This macro is used to make a character print one way in \tt -% (where it can probably be output as-is), and another way in other fonts, -% where something hairier probably needs to be done. -% -% #1 is what to print if we are indeed using \tt; #2 is what to print -% otherwise. Since all the Computer Modern typewriter fonts have zero -% interword stretch (and shrink), and it is reasonable to expect all -% typewriter fonts to have this, we can check that font parameter. -% -\def\ifusingtt#1#2{\ifdim \fontdimen3\font=0pt #1\else #2\fi} - -% Same as above, but check for italic font. Actually this also catches -% non-italic slanted fonts since it is impossible to distinguish them from -% italic fonts. But since this is only used by $ and it uses \sl anyway -% this is not a problem. -\def\ifusingit#1#2{\ifdim \fontdimen1\font>0pt #1\else #2\fi} - -% Turn off all special characters except @ -% (and those which the user can use as if they were ordinary). -% Most of these we simply print from the \tt font, but for some, we can -% use math or other variants that look better in normal text. - -\catcode`\"=\active -\def\activedoublequote{{\tt\char34}} -\let"=\activedoublequote -\catcode`\~=\active -\def~{{\tt\char126}} -\chardef\hat=`\^ -\catcode`\^=\active -\def^{{\tt \hat}} - -\catcode`\_=\active -\def_{\ifusingtt\normalunderscore\_} -\let\realunder=_ -% Subroutine for the previous macro. -\def\_{\leavevmode \kern.07em \vbox{\hrule width.3em height.1ex}\kern .07em } - -\catcode`\|=\active -\def|{{\tt\char124}} -\chardef \less=`\< -\catcode`\<=\active -\def<{{\tt \less}} -\chardef \gtr=`\> -\catcode`\>=\active -\def>{{\tt \gtr}} -\catcode`\+=\active -\def+{{\tt \char 43}} -\catcode`\$=\active -\def${\ifusingit{{\sl\$}}\normaldollar}%$ font-lock fix - -% If a .fmt file is being used, characters that might appear in a file -% name cannot be active until we have parsed the command line. -% So turn them off again, and have \everyjob (or @setfilename) turn them on. -% \otherifyactive is called near the end of this file. -\def\otherifyactive{\catcode`+=\other \catcode`\_=\other} - -\catcode`\@=0 - -% \backslashcurfont outputs one backslash character in current font, -% as in \char`\\. -\global\chardef\backslashcurfont=`\\ -\global\let\rawbackslashxx=\backslashcurfont % let existing .??s files work - -% \rawbackslash defines an active \ to do \backslashcurfont. -% \otherbackslash defines an active \ to be a literal `\' character with -% catcode other. -{\catcode`\\=\active - @gdef@rawbackslash{@let\=@backslashcurfont} - @gdef@otherbackslash{@let\=@realbackslash} -} - -% \realbackslash is an actual character `\' with catcode other, and -% \doublebackslash is two of them (for the pdf outlines). -{\catcode`\\=\other @gdef@realbackslash{\} @gdef@doublebackslash{\\}} - -% \normalbackslash outputs one backslash in fixed width font. -\def\normalbackslash{{\tt\backslashcurfont}} - -\catcode`\\=\active - -% Used sometimes to turn off (effectively) the active characters -% even after parsing them. -@def@turnoffactive{% - @let"=@normaldoublequote - @let\=@realbackslash - @let~=@normaltilde - @let^=@normalcaret - @let_=@normalunderscore - @let|=@normalverticalbar - @let<=@normalless - @let>=@normalgreater - @let+=@normalplus - @let$=@normaldollar %$ font-lock fix - @unsepspaces -} - -% Same as @turnoffactive except outputs \ as {\tt\char`\\} instead of -% the literal character `\'. (Thus, \ is not expandable when this is in -% effect.) -% -@def@normalturnoffactive{@turnoffactive @let\=@normalbackslash} - -% Make _ and + \other characters, temporarily. -% This is canceled by @fixbackslash. -@otherifyactive - -% If a .fmt file is being used, we don't want the `\input texinfo' to show up. -% That is what \eatinput is for; after that, the `\' should revert to printing -% a backslash. -% -@gdef@eatinput input texinfo{@fixbackslash} -@global@let\ = @eatinput - -% On the other hand, perhaps the file did not have a `\input texinfo'. Then -% the first `\{ in the file would cause an error. This macro tries to fix -% that, assuming it is called before the first `\' could plausibly occur. -% Also turn back on active characters that might appear in the input -% file name, in case not using a pre-dumped format. -% -@gdef@fixbackslash{% - @ifx\@eatinput @let\ = @normalbackslash @fi - @catcode`+=@active - @catcode`@_=@active -} - -% Say @foo, not \foo, in error messages. -@escapechar = `@@ - -% These look ok in all fonts, so just make them not special. -@catcode`@& = @other -@catcode`@# = @other -@catcode`@% = @other - - -@c Local variables: -@c eval: (add-hook 'write-file-hooks 'time-stamp) -@c page-delimiter: "^\\\\message" -@c time-stamp-start: "def\\\\texinfoversion{" -@c time-stamp-format: "%:y-%02m-%02d.%02H" -@c time-stamp-end: "}" -@c End: - -@c vim:sw=2: - -@ignore - arch-tag: e1b36e32-c96e-4135-a41a-0b2efa2ea115 -@end ignore diff --git a/doc/version.texi b/doc/version.texi deleted file mode 100644 index 46b5982..0000000 --- a/doc/version.texi +++ /dev/null @@ -1,4 +0,0 @@ -@set UPDATED 10 September 2007 -@set UPDATED-MONTH September 2007 -@set EDITION 2.5.35 -@set VERSION 2.5.35 diff --git a/examples/Makefile.in b/examples/Makefile.in deleted file mode 100644 index 5e244bb..0000000 --- a/examples/Makefile.in +++ /dev/null @@ -1,501 +0,0 @@ -# Makefile.in generated by automake 1.9.6 from Makefile.am. -# @configure_input@ - -# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, -# 2003, 2004, 2005 Free Software Foundation, Inc. -# This Makefile.in is free software; the Free Software Foundation -# gives unlimited permission to copy and/or distribute it, -# with or without modifications, as long as this notice is preserved. - -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY, to the extent permitted by law; without -# even the implied warranty of MERCHANTABILITY or FITNESS FOR A -# PARTICULAR PURPOSE. - -@SET_MAKE@ - -# This file is part of flex. - -# Redistribution and use in source and binary forms, with or without -# modification, are permitted provided that the following conditions -# are met: - -# 1. 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