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/*
* Copyright (c) 2002, Jon Travis
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* ekhtml_comment.c: Comment tag processor for El-Kabong.
*
* The comment processor is a pretty simple piece of machinery. It
* relies that the first 4 characters are '<!--'. It then searches
* for two adjacent dashes '--' followed by optional whitespace,
* followed by a '>'.
*/
#include <string.h>
#include <assert.h>
#include "ekhtml_config.h"
#include "ekhtml.h"
#include "ekhtml_tables.h"
#define EKHTML_USE_PRIVATE
#include "ekhtml_private.h"
char *ekhtml_parse_comment(ekhtml_parser_t *parser, void **state_data,
const char *curp, const char *endp,
int *baddata)
{
ekhtml_comment_state *comstate = *state_data;
int *offset = &parser->state.offset;
const char *workp;
assert(*curp == '<' && *(curp + 1) == '!' && *(curp + 2) == '-');
assert(*(curp + 3) == '-' && endp - curp >= 4);
if(comstate == NULL){ /* Only called the first time the tag is started */
comstate = &parser->commentstate;
comstate->dashes = 0;
comstate->lastdash = 0;
*state_data = comstate;
*offset = sizeof("<!--") - 1;
}
workp = curp + *offset;
while(workp != endp){
if(comstate->dashes == 0){ /* Still on the quest for the double dash*/
/* XXX -- Searching for '--' could be faster, doing
multibyte searching, or something similar */
for(; workp < endp - 1; workp += 2){
if(*workp == '-')
break;
}
if(!(workp < endp - 1)){
*offset = endp - 1 - curp;
return NULL;
}
if((*(workp - 1) == '-') &&
(workp - curp) > (sizeof("<!--") - 1))
{
comstate->lastdash = workp - 1 - curp;
comstate->dashes = 1;
} else if(*(workp + 1) == '-'){
comstate->lastdash = workp - curp;
comstate->dashes = 1;
} else {
/* Else, a lone dash -- how sad, lonely dash.. ;-) */
}
workp++;
continue;
}
/* At this point we have the double dash. Search through whitespace */
workp = ekhtml_find_notcharsmap(workp, endp - workp, EKCMap_CharMap,
EKHTML_CHAR_WHITESPACE);
if(workp == endp){/* Reached end of the data without finding the '>' */
*offset = workp - curp;
return NULL;
}
if(*workp == '>'){
if(parser->commentcb){
ekhtml_string_t str;
str.str = curp + 4;
str.len = comstate->lastdash - 4;
parser->commentcb(parser->cbdata, &str);
}
*state_data = NULL;
return (char *)workp + 1;
} else {
comstate->dashes = 0;
}
}
*offset = workp - curp;
return NULL; /* Not done yet */
}
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