scanner.l

flex

/*
 * 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". */
#include <stdio.h>
#include <stdlib.h>
#include "config.h"

#define NUMBER 200
#define WORD   201

%}

%option 8bit outfile="scanner.c" prefix="test"
%option nounput nomain nodefault noyywrap 
%option warn reentrant


%%

[[:space:]]+   { }
[[:digit:]]+   { printf("NUMBER "); fflush(stdout);}
[[:alpha:]]+   { printf("WORD "); fflush(stdout);}
.              {
    fprintf(stderr,"*** Error: Unrecognized character '%c' while scanning.\n",
         yytext[0]);
    yyterminate();
    }

<<EOF>>  { printf("<<EOF>>\n"); yyterminate();}

%%


#define INPUT_STRING_1  "1234 foo bar"
#define INPUT_STRING_2  "1234 foo bar *@&@&###@^$#&#*"

int main(void);

int
main ()
{
    char * buf;
    int len;
    YY_BUFFER_STATE state;
    yyscan_t  scanner=NULL;


    /* Scan a good string. */
    printf("Testing: yy_scan_string(%s): ",INPUT_STRING_1); fflush(stdout);
    yylex_init(&scanner);
    state = yy_scan_string ( INPUT_STRING_1 ,scanner);
    yylex(scanner);
    yy_delete_buffer(state, scanner);
    yylex_destroy(scanner);

    /* Scan only the first 12 chars of a string. */
    printf("Testing: yy_scan_bytes(%s): ",INPUT_STRING_2); fflush(stdout);
    yylex_init(&scanner);
    state = yy_scan_bytes  ( INPUT_STRING_2, 12 ,scanner);
    yylex(scanner);
    yy_delete_buffer(state,scanner);
    yylex_destroy(scanner);

    /* Scan directly from a buffer.
       We make a copy, since the buffer will be modified by flex.*/
    printf("Testing: yy_scan_buffer(%s): ",INPUT_STRING_1); fflush(stdout);
    len = strlen(INPUT_STRING_1) + 2;
    buf = (char*)malloc( len );
    strcpy( buf, INPUT_STRING_1);
    buf[ len -2 ]  = 0; /* Flex requires two NUL bytes at end of buffer. */
    buf[ len -1 ] =0;

    yylex_init(&scanner);
    state = yy_scan_buffer( buf, len ,scanner);
    yylex(scanner);
    yy_delete_buffer(state,scanner);
    yylex_destroy(scanner);
    
    printf("TEST RETURNING OK.\n");
    return 0;
}