| /* |
| * 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-trailing # report flex's yylineno |
| test-lineno-trailing 1 # report count_newlines(stdin) |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "config.h" |
| |
| %} |
| |
| %option 8bit prefix="test" |
| %option nounput nomain noyywrap noinput yylineno |
| %option warn |
| |
| WORD [[:alpha:]]+ |
| |
| %% |
| /* The goal here is to test the yylineno in the context of trailing-contexts. |
| Using rules that have newlines in look-ahead. |
| */ |
| "Fixed_trailing:"/[\n]"test"[\n] {} |
| "Var_trailing:"{WORD}/[\n] {} |
| "Var_prefix_and_trailing:"{WORD}":"/(\n{WORD})* {} |
| \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, char**); |
| |
| int |
| main ( int argc, char **argv ) |
| { |
| (void)argv; |
| |
| if( argc > 1 ) |
| printf("%d\n", count_newlines(stdin)); |
| |
| else{ |
| yyin = stdin; |
| yyout = stdout; |
| yylex(); |
| } |
| return 0; |
| } |