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/*b
* Copyright (C) 2001,2002 Rick Richardson
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Rick Richardson <rickr@mn.rr.com>
b*/
/*
* This is a simple byte-stream lexical analyzer for SGML. It produces only
* two tokens: tag or text, which are returned via a callback function.
*
* see sgml.h for doco.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "debug.h"
#include "sgml.h"
struct sgml_lexer
{
int state;
char *buf;
int bufsize;
char *bufp;
char *bufe;
int eof;
};
void
sgml_lexer_http(SGML_LEXER *lp)
{
lp->state = 'h';
lp->eof = 0;
lp->bufp = lp->buf;
}
void
sgml_lexer_reset(SGML_LEXER *lp)
{
lp->state = 0;
lp->eof = 0;
lp->bufp = lp->buf;
}
SGML_LEXER *
sgml_lexer_new(int bufsize)
{
SGML_LEXER *lp;
if (bufsize == 0)
bufsize = 4096;
lp = malloc(sizeof(SGML_LEXER));
if (!lp)
return NULL;
lp->buf = malloc(bufsize);
if (!lp->buf)
{
free(lp);
return NULL;
}
lp->bufsize = bufsize;
lp->bufe = lp->buf + lp->bufsize - 1;
lp->bufp = lp->buf;
sgml_lexer_reset(lp);
return lp;
}
void
sgml_lexer_destroy(SGML_LEXER *lp)
{
if (!lp)
return;
if (lp->buf)
free(lp->buf);
free(lp);
}
SGML_LEXER_RC
sgml_lexer_putc(SGML_LEXER *lp, int c, SGML_LEXER_CB cb, void *cbarg)
{
if (lp->eof)
return SGML_LEXER_EOF;
if (c == EOF)
lp->eof = 1;
switch (lp->state)
{
case 'h':
// Parse HTTP first
if (c == '\r')
break;
else if (c == '\n')
{
if (lp->bufp == lp->buf)
{
lp->state = 0;
debug(5, "HTTP END\n");
if (cb)
(*cb)(cbarg, SGML_LEXER_HTTP_END, NULL);
}
else
{
*lp->bufp = 0;
debug(5, "HTTP: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_HTTP, lp->buf);
lp->bufp = lp->buf;
return SGML_LEXER_CONT;
}
}
else
{
*lp->bufp++ = c;
if (lp->bufp == lp->bufe)
{
*lp->bufp = 0;
debug(5, "Trunc HTTP: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_HTTP_TRUNC, lp->buf);
lp->bufp = lp->buf;
return SGML_LEXER_CONT;
}
}
break;
case 0:
// Eat chars until first tag
if (c == '<')
{
lp->state = '<';
lp->bufp = lp->buf;
}
break;
case '<':
if (c == EOF)
return SGML_LEXER_EOF;
else if (c == '>')
{
*lp->bufp = 0;
debug(5, "Tag: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_TAG, lp->buf);
lp->state = 't';
lp->bufp = lp->buf;
return SGML_LEXER_CONT;
}
else
{
if (c == '\r' || c == '\n')
c = ' ';
*lp->bufp++ = c;
if (lp->bufp == lp->bufe)
{
*lp->bufp = 0;
debug(5, "Trunc Tag: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_TAG_TRUNC, lp->buf);
lp->bufp = lp->buf;
return SGML_LEXER_CONT;
}
}
break;
case 't':
if (c == '<' || c == EOF)
{
lp->state = '<';
if (lp->bufp != lp->buf)
{
*lp->bufp = 0;
debug(5, "Text: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_TEXT, lp->buf);
lp->bufp = lp->buf;
}
return (c == EOF) ? SGML_LEXER_EOF : SGML_LEXER_CONT;
}
else
{
*lp->bufp++ = c;
if (lp->bufp == lp->bufe)
{
*lp->bufp = 0;
debug(5, "Trunc Text: <%s>\n", lp->buf);
if (cb)
(*cb)(cbarg, SGML_LEXER_TEXT_TRUNC, lp->buf);
lp->bufp = lp->buf;
return SGML_LEXER_CONT;
}
}
break;
default:
lp->eof = 1;
return SGML_LEXER_EOF;
}
return SGML_LEXER_CONT;
}
/* vim:set sw=4: */
|
