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
main(argc,argv)74 main ( argc, argv )
75 int argc;
76 char** argv;
77 {
78 (void)argv;
79
80 if( argc > 1 )
81 printf("%d\n", count_newlines(stdin));
82
83 else{
84 yyin = stdin;
85 yyout = stdout;
86 yylex();
87 }
88 return 0;
89 }
90