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Diffstat (limited to 'tests/lineno_r.l')
-rw-r--r-- | tests/lineno_r.l | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tests/lineno_r.l b/tests/lineno_r.l new file mode 100644 index 0000000..e6207c6 --- /dev/null +++ b/tests/lineno_r.l @@ -0,0 +1,99 @@ +/* + * 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. 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. + */ + +%{ +/* A template scanner file to build "scanner.c". + Run as: + test-lineno-r # report flex's yylineno + test-lineno-r 1 # report count_newlines(stdin) +*/ + +#include <stdio.h> +#include <stdlib.h> +#include "config.h" + +%} + +%option 8bit prefix="test" +%option nounput nomain noyywrap noinput yylineno reentrant +%option warn + +WORD [[:alpha:]]+ +DIGIT [[:digit:]] + +%% + /* The goal here is to test the yylineno processing by: + - providing some rules than CAN match newlines and + other rules that can NOT match newlines, + - matching several newlines in one rule, + - directly modifying yylineno. + */ + +"yylineno++" yylineno++; +"yylineno--" yylineno--; +[[:blank:]]+ +{WORD} +{DIGIT}+(\n{DIGIT}+)* +\n +. +<<EOF>> { printf("%d\n", yylineno); + yyterminate(); + } + +%% + +/* returns number of '\n' characters in input, plus one. + This is what flex does, essentially. */ + +static int +count_newlines (FILE* in) +{ + int n=1,c; + while ((c=fgetc(in)) != EOF) + if( c == '\n') + n++; + return n; +} + +int main ( int argc, char** argv ); + +int +main (argc, argv) + int argc; + char ** argv; +{ + (void)argv; + + if( argc > 1 ) + printf("%d\n", count_newlines(stdin)); + + else{ + yyscan_t s; + yylex_init(&s); + yyset_in(stdin,s); + yyset_out(stdout,s); + yylex(s); + yylex_destroy(s); + } + return 0; +} |