105 lines
2.6 KiB
Plaintext
105 lines
2.6 KiB
Plaintext
/* $NetBSD: scanner.l,v 1.1.1.1 2009/10/26 00:29:31 christos Exp $ */
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/*
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* This file is part of flex.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE.
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*/
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%{
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/* A scanner file to build "scanner.c".
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Input language is any text.
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"#include <filename>" causes a buffer switch.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "config.h"
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%}
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%option 8bit outfile="scanner.c" prefix="test"
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%option nounput nomain noyywrap
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%option warn
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%x GET_FILENAME
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%{
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#define MAX_INCLUDE_DEPTH 10
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YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
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int include_stack_ptr = 0;
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%}
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%%
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<INITIAL>{
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^"#include"[[:blank:]]+"<" { BEGIN(GET_FILENAME); }
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.|\n { ECHO; }
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}
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<GET_FILENAME>{
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[[:alnum:]_.-]+> {
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/* recurse */
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yytext[yyleng-1]='\0';
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include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER;
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if((yyin=fopen(yytext,"r"))==NULL) {
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fprintf(stderr,"*** Error: Could not open include file \"%s\".\n",yytext);
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yyterminate();
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}
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yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE ));
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BEGIN(0);
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}
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.|\n {
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fprintf(stderr,"Invalid input \"%s\".\n", yytext);
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yyterminate();
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}
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}
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<<EOF>> {
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if ( --include_stack_ptr < 0 ) {
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yyterminate();
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}
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else {
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fclose(yyin);
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yy_delete_buffer( YY_CURRENT_BUFFER );
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yy_switch_to_buffer( include_stack[include_stack_ptr] );
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}
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}
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%%
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int main(int argc, char** argv);
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int
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main ( int argc, char** argv )
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{
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FILE * fp;
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if( argc != 2 ) {
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fprintf(stderr,"*** Error: Must specifiy one filename.\n");
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exit(-1);
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}
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if((fp=fopen(argv[1],"r"))==NULL) {
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fprintf(stderr,"*** Error: fopen(%s) failed.\n",argv[1]);
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exit(-1);
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}
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yyin = fp;
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yyout = stdout;
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yylex();
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printf("TEST RETURNING OK.\n");
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return 0;
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}
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