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#include "flexdef.h"
#include "y.tab.h"
/*
* Copyright (c) 1987, the University of California
*
* 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.
*
* This program may be redistributed. Enhancements and derivative works
* may be created provided the new works, if made available to the general
* public, are made available for use by anyone.
*/
/* yylex - scan for a regular expression token
*
* synopsis
*
* token = yylex();
*
* token - return token found
*/
int yylex()
{
int toktype;
static int beglin = false;
if ( eofseen )
toktype = EOF;
else
toktype = flexscan();
if ( toktype == EOF )
{
eofseen = 1;
if ( sectnum == 1 )
{
synerr( "unexpected EOF" );
sectnum = 2;
toktype = SECTEND;
}
else if ( sectnum == 2 )
{
sectnum = 3;
toktype = SECTEND;
}
else
toktype = 0;
}
if ( trace )
{
if ( beglin )
{
fprintf( stderr, "%d\t", accnum + 1 );
beglin = 0;
}
switch ( toktype )
{
case '<':
case '>':
case '^':
case '$':
case '"':
case '[':
case ']':
case '{':
case '}':
case '|':
case '(':
case ')':
case '-':
case '/':
case '\\':
case '?':
case '.':
case '*':
case '+':
case ',':
(void) putc( toktype, stderr );
break;
case '\n':
(void) putc( '\n', stderr );
if ( sectnum == 2 )
beglin = 1;
break;
case SCDECL:
fputs( "%s", stderr );
break;
case XSCDECL:
fputs( "%x", stderr );
break;
case WHITESPACE:
(void) putc( ' ', stderr );
break;
case SECTEND:
fputs( "%%\n", stderr );
/* we set beglin to be true so we'll start
* writing out numbers as we echo rules. flexscan() has
* already assigned sectnum
*/
if ( sectnum == 2 )
beglin = 1;
break;
case NAME:
fprintf( stderr, "'%s'", nmstr );
break;
case CHAR:
switch ( yylval )
{
case '<':
case '>':
case '^':
case '$':
case '"':
case '[':
case ']':
case '{':
case '}':
case '|':
case '(':
case ')':
case '-':
case '/':
case '\\':
case '?':
case '.':
case '*':
case '+':
case ',':
fprintf( stderr, "\\%c", yylval );
break;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
case 16:
case 17:
case 18:
case 19:
case 20:
case 21:
case 22:
case 23:
case 24:
case 25:
case 26:
case 27:
case 28:
case 29:
case 30:
case 31:
fprintf( stderr, "^%c", 'A' + yylval - 1 );
break;
case 127:
(void) putc( '^', stderr );
(void) putc( '@', stderr );
break;
default:
(void) putc( yylval, stderr );
break;
}
break;
case NUMBER:
fprintf( stderr, "%d", yylval );
break;
case PREVCCL:
fprintf( stderr, "[%d]", yylval );
break;
case 0:
fprintf( stderr, "End Marker" );
break;
default:
fprintf( stderr, "*Something Weird* - tok: %d val: %d\n",
toktype, yylval );
break;
}
}
return ( toktype );
}
|
