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-r # report flex's yylineno 28 test-lineno-r 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 reentrant 39 %option warn 40 41 WORD [[:alpha:]]+ 42 DIGIT [[:digit:]] 43 44 %% 45 /* The goal here is to test the yylineno processing by: 46 - providing some rules than CAN match newlines and 47 other rules that can NOT match newlines, 48 - matching several newlines in one rule, 49 - directly modifying yylineno. 50 */ 51 52 "yylineno++" yylineno++; 53 "yylineno--" yylineno--; 54 [[:blank:]]+ 55 {WORD} 56 {DIGIT}+(\n{DIGIT}+)* 57 \n 58 . 59 <<EOF>> { printf("%d\n", yylineno); 60 yyterminate(); 61 } 62 63 %% 64 65 /* returns number of '\n' characters in input, plus one. 66 This is what flex does, essentially. */ 67 68 static int 69 count_newlines (FILE* in) 70 { 71 int n=1,c; 72 while ((c=fgetc(in)) != EOF) 73 if( c == '\n') 74 n++; 75 return n; 76 } 77 78 int main ( int argc, char** argv ); 79 80 int 81 main (int argc, char **argv) 82 { 83 (void)argv; 84 85 if( argc > 1 ) 86 printf("%d\n", count_newlines(stdin)); 87 88 else{ 89 yyscan_t s; 90 testlex_init(&s); 91 testset_in(stdin,s); 92 testset_out(stdout,s); 93 testlex(s); 94 testlex_destroy(s); 95 } 96 return 0; 97 } 98