/* $NetBSD: scanner.l,v 1.1.1.1 2009/10/26 00:29:26 christos Exp $ */ /* * 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-nr # report flex's yylineno test-lineno-nr 1 # report count_newlines(stdin) */ #include #include #include "config.h" %} %option 8bit outfile="scanner.c" prefix="test" %option nounput nomain noyywrap yylineno %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 . <> { 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 ( argc, argv ) int argc; char** argv; { if( argc > 1 ) printf("%d\n", count_newlines(stdin)); else{ yyin = stdin; yyout = stdout; yylex(); } return 0; }