217 lines
4.1 KiB
C
217 lines
4.1 KiB
C
/* yylex - scanner front-end for flex */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] =
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"@(#) $Header: /cvsroot/src/usr.bin/lex/Attic/yylex.c,v 1.2 1993/05/04 07:45:17 cgd Exp $ (LBL)";
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#endif
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#include <ctype.h>
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#include "flexdef.h"
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#include "parse.h"
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/* ANSI C does not guarantee that isascii() is defined */
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#ifndef isascii
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#define isascii(c) ((c) <= 0177)
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#endif
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/* yylex - scan for a regular expression token
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*
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* synopsis
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*
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* token = yylex();
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*
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* token - return token found
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*/
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int yylex()
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{
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int toktype;
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static int beglin = false;
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if ( eofseen )
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toktype = EOF;
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else
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toktype = flexscan();
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if ( toktype == EOF || toktype == 0 )
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{
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eofseen = 1;
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if ( sectnum == 1 )
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{
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synerr( "premature EOF" );
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sectnum = 2;
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toktype = SECTEND;
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}
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else if ( sectnum == 2 )
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{
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sectnum = 3;
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toktype = 0;
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}
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else
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toktype = 0;
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}
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if ( trace )
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{
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if ( beglin )
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{
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fprintf( stderr, "%d\t", num_rules + 1 );
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beglin = 0;
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}
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switch ( toktype )
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{
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case '<':
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case '>':
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case '^':
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case '$':
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case '"':
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case '[':
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case ']':
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case '{':
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case '}':
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case '|':
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case '(':
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case ')':
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case '-':
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case '/':
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case '\\':
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case '?':
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case '.':
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case '*':
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case '+':
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case ',':
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(void) putc( toktype, stderr );
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break;
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case '\n':
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(void) putc( '\n', stderr );
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if ( sectnum == 2 )
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beglin = 1;
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break;
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case SCDECL:
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fputs( "%s", stderr );
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break;
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case XSCDECL:
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fputs( "%x", stderr );
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break;
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case WHITESPACE:
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(void) putc( ' ', stderr );
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break;
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case SECTEND:
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fputs( "%%\n", stderr );
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/* we set beglin to be true so we'll start
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* writing out numbers as we echo rules. flexscan() has
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* already assigned sectnum
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*/
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if ( sectnum == 2 )
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beglin = 1;
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break;
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case NAME:
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fprintf( stderr, "'%s'", nmstr );
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break;
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case CHAR:
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switch ( yylval )
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{
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case '<':
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case '>':
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case '^':
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case '$':
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case '"':
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case '[':
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case ']':
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case '{':
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case '}':
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case '|':
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case '(':
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case ')':
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case '-':
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case '/':
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case '\\':
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case '?':
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case '.':
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case '*':
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case '+':
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case ',':
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fprintf( stderr, "\\%c", yylval );
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break;
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default:
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if ( ! isascii( yylval ) || ! isprint( yylval ) )
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fprintf( stderr, "\\%.3o", yylval );
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else
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(void) putc( yylval, stderr );
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break;
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}
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break;
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case NUMBER:
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fprintf( stderr, "%d", yylval );
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break;
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case PREVCCL:
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fprintf( stderr, "[%d]", yylval );
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break;
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case EOF_OP:
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fprintf( stderr, "<<EOF>>" );
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break;
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case 0:
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fprintf( stderr, "End Marker" );
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break;
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default:
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fprintf( stderr, "*Something Weird* - tok: %d val: %d\n",
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toktype, yylval );
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break;
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}
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}
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return ( toktype );
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}
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