1 /* 2 * This file is part of flex. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE. 22 */ 23 24 %{ 25 /* A template scanner file to build "scanner.c". 26 Run as: 27 test-lineno-trailing # report flex's yylineno 28 test-lineno-trailing 1 # report count_newlines(stdin) 29 */ 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include "config.h" 34 35 %} 36 37 %option 8bit prefix="test" 38 %option nounput nomain noyywrap noinput yylineno 39 %option warn 40 41 WORD [[:alpha:]]+ 42 43 %% 44 /* The goal here is to test the yylineno in the context of trailing-contexts. 45 Using rules that have newlines in look-ahead. 46 */ 47 "Fixed_trailing:"/[\n]"test"[\n] {} 48 "Var_trailing:"{WORD}/[\n] {} 49 "Var_prefix_and_trailing:"{WORD}":"/(\n{WORD})* {} 50 \n {} 51 . {} 52 <<EOF>> { printf("%d\n", yylineno); 53 yyterminate(); 54 } 55 56 %% 57 58 /* returns number of '\n' characters in input, plus one. 59 This is what flex does, essentially. */ 60 61 static int 62 count_newlines (FILE* in) 63 { 64 int n=1,c; 65 while ((c=fgetc(in)) != EOF) 66 if( c == '\n') 67 n++; 68 return n; 69 } 70 71 int main ( int, char**); 72 73 int 74 main ( int argc, char **argv ) 75 { 76 (void)argv; 77 78 if( argc > 1 ) 79 printf("%d\n", count_newlines(stdin)); 80 81 else{ 82 yyin = stdin; 83 yyout = stdout; 84 yylex(); 85 } 86 return 0; 87 } 88