212 lines
4.0 KiB
C
212 lines
4.0 KiB
C
/* yylex - scanner front-end for flex */
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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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/* This code is derived from software contributed to Berkeley by */
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/* Vern Paxson. */
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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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/* This file is part of flex. */
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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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/* 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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/* 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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/* 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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#include <ctype.h>
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#include "flexdef.h"
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#include "parse.h"
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/* yylex - scan for a regular expression token */
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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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extern char *yytext;
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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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eofseen = 1;
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if (sectnum == 1) {
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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
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toktype = 0;
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}
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if (trace) {
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if (beglin) {
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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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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 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.
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* flexscan() has 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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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,
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"\\%.3o",
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(unsigned int) 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 OPTION_OP:
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fprintf (stderr, "%s ", yytext);
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break;
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case OPT_OUTFILE:
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case OPT_PREFIX:
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case CCE_ALNUM:
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case CCE_ALPHA:
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case CCE_BLANK:
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case CCE_CNTRL:
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case CCE_DIGIT:
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case CCE_GRAPH:
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case CCE_LOWER:
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case CCE_PRINT:
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case CCE_PUNCT:
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case CCE_SPACE:
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case CCE_UPPER:
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case CCE_XDIGIT:
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fprintf (stderr, "%s", yytext);
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break;
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case 0:
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fprintf (stderr, _("End Marker\n"));
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break;
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default:
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fprintf (stderr,
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_
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("*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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