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This is the initial release of flex, a replacement for the lex(1)
tool. As the copyright indicates, this distribution can be freely
redistributed.
Some notes on the distribution:
Yes, there are some niggling lex features which are not available which
seem like they'd be easy to add. They're not, or if they are then the
straight-forward implementation of them would slow down the scanner.
Unfortunately I am unable to do any further work on flex other than bug
fixes, so if there's something you've just gotta have, you'd better
be willing to dive into the code. I'll be happy to give (fairly
high-level) advice on how to proceed.
The compressed tables have been tested pretty thoroughly in the past,
though may be suffering from bit-rot. The fast/full tables have been
recently implemented and are more likely to have bugs.
For a System V machine, add the #define "SV". Not guaranteed to do
the full job, but a step in the right direction.
Flex has been successfully ported to Sun Unix and 4.3BSD Vax Unix.
The flex distribution consists of the following files:
README This message
Changes Differences between this release and the beta-test
Makefile
flexdef.h
parse.y
scan.l
ccl.c
dfa.c flex sources
ecs.c
main.c
misc.c
nfa.c
sym.c
tblcmp.c
yylex.c
scan.c.dist pre-flex'd version of scan.l
flex.skel
flex.fastskel
flexskelcom.h skeleton scanner sources
flexskeldef.h
fastskeldef.h
flex.1 manual entry
Timings a brief note comparing timings of flex vs. lex
The files are packaged as a compressed shell archive, which in turn
contains seven shell archives. Create a directory where you want flex
to live, cd there, and use
uncompress flex.shar.Z
sh flex.shar.1
sh flex.shar.2
sh flex.shar.3
sh flex.shar.4
sh flex.shar.5
sh flex.shar.6
sh flex.shar.7
to extract them.
Either move {flexskelcom.h,flexskeldef.h,fastskeldef.h} into /usr/include
or edit {flex.skel,flex.fastskel,flexskeldef.h,fastskeldef.h,scan.c}
and wire in the full pathname of where you are going to keep the include files.
Decide where you want to keep {flex.skel,flex.fastskel} (suggestion:
/usr/local/lib) and move it there. Edit "Makefile" and change the
definitions of SKELETON_FILE and F_SKELETON_FILE to reflect the full
pathnames of {flex.skel,flex.fastskel}.
To make flex for the first time, use:
make first_flex
which uses a pre-generated copy of the scanner whose source is in flex.
For subsequent makes, just use:
make
Assuming it builds successfully, you can test it using
make test
The "diff" should not show any differences.
If you're feeling adventurous, rebuild scan.c using various
combinations of FLEX_FLAGS, each time trying "make test" when
you're done. To rebuild it, do
rm scan.c
make FLEX_FLAGS="..."
where "..." is one of:
-ist -c
-ist -ce
-ist -cm
-istf
-istF
and testing using:
make FLEX_FLAGS="..." test
Format the manual entry using
nroff -man flex.1
Please send problems and feedback to:
vern@lbl-{csam,rtsg}.arpa or ucbvax!lbl-csam.arpa!vern
Vern Paxson
Real Time Systems Group
Bldg. 46A
Lawrence Berkeley Laboratory
1 Cyclotron Rd.
Berkeley, CA 94720
(415) 486-6411
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