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|
/* yylex - scanner front-end for flex */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Vern Paxson.
*
* The United States Government has rights in this work pursuant
* to contract no. DE-AC03-76SF00098 between the United States
* Department of Energy and the University of California.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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.
*/
/* $Header: /home/daffy/u0/vern/flex/RCS/yylex.c,v 2.13 95/03/04 16:10:41 vern Exp $ */
/* $FreeBSD$ */
#include <ctype.h>
#include "flexdef.h"
#include "parse.h"
/* yylex - scan for a regular expression token */
int yylex()
{
int toktype;
static int beglin = false;
extern char *yytext;
if ( eofseen )
toktype = EOF;
else
toktype = flexscan();
if ( toktype == EOF || toktype == 0 )
{
eofseen = 1;
if ( sectnum == 1 )
{
synerr( _( "premature EOF" ) );
sectnum = 2;
toktype = SECTEND;
}
else
toktype = 0;
}
if ( trace )
{
if ( beglin )
{
fprintf( stderr, "%d\t", num_rules + 1 );
beglin = 0;
}
switch ( toktype )
{
case '<':
case '>':
case '^':
case '$':
case '"':
case '[':
case ']':
case '{':
case '}':
case '|':
case '(':
case ')':
case '-':
case '/':
case '\\':
case '?':
case '.':
case '*':
case '+':
case ',':
(void) putc( toktype, stderr );
break;
case '\n':
(void) putc( '\n', stderr );
if ( sectnum == 2 )
beglin = 1;
break;
case SCDECL:
fputs( "%s", stderr );
break;
case XSCDECL:
fputs( "%x", stderr );
break;
case SECTEND:
fputs( "%%\n", stderr );
/* We set beglin to be true so we'll start
* writing out numbers as we echo rules.
* flexscan() has already assigned sectnum.
*/
if ( sectnum == 2 )
beglin = 1;
break;
case NAME:
fprintf( stderr, "'%s'", nmstr );
break;
case CHAR:
switch ( yylval )
{
case '<':
case '>':
case '^':
case '$':
case '"':
case '[':
case ']':
case '{':
case '}':
case '|':
case '(':
case ')':
case '-':
case '/':
case '\\':
case '?':
case '.':
case '*':
case '+':
case ',':
fprintf( stderr, "\\%c",
yylval );
break;
default:
if ( ! isascii( yylval ) ||
! isprint( yylval ) )
fprintf( stderr,
"\\%.3o",
(unsigned int) yylval );
else
(void) putc( yylval,
stderr );
break;
}
break;
case NUMBER:
fprintf( stderr, "%d", yylval );
break;
case PREVCCL:
fprintf( stderr, "[%d]", yylval );
break;
case EOF_OP:
fprintf( stderr, "<<EOF>>" );
break;
case OPTION_OP:
fprintf( stderr, "%s ", yytext );
break;
case OPT_OUTFILE:
case OPT_PREFIX:
case CCE_ALNUM:
case CCE_ALPHA:
case CCE_BLANK:
case CCE_CNTRL:
case CCE_DIGIT:
case CCE_GRAPH:
case CCE_LOWER:
case CCE_PRINT:
case CCE_PUNCT:
case CCE_SPACE:
case CCE_UPPER:
case CCE_XDIGIT:
fprintf( stderr, "%s", yytext );
break;
case 0:
fprintf( stderr, _( "End Marker\n" ) );
break;
default:
fprintf( stderr,
_( "*Something Weird* - tok: %d val: %d\n" ),
toktype, yylval );
break;
}
}
return toktype;
}
|
