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#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "buffer.h"
#include "houdini.h"
#include "utf8.h"
#include "html_unescape.h"
size_t
houdini_unescape_ent(cmark_strbuf *ob, const uint8_t *src, size_t size)
{
size_t i = 0;
if (size > 3 && src[0] == '#') {
int codepoint = 0;
if (_isdigit(src[1])) {
for (i = 1; i < size && _isdigit(src[i]); ++i) {
int cp = (codepoint * 10) + (src[i] - '0');
if (cp < codepoint)
return 0;
codepoint = cp;
}
}
else if (src[1] == 'x' || src[1] == 'X') {
for (i = 2; i < size && _isxdigit(src[i]); ++i) {
int cp = (codepoint * 16) + ((src[i] | 32) % 39 - 9);
if (cp < codepoint)
return 0;
codepoint = cp;
}
}
if (i < size && src[i] == ';' && codepoint) {
utf8proc_encode_char(codepoint, ob);
return i + 1;
}
}
else {
if (size > MAX_WORD_LENGTH)
size = MAX_WORD_LENGTH;
for (i = MIN_WORD_LENGTH; i < size; ++i) {
if (src[i] == ' ')
break;
if (src[i] == ';') {
const struct html_ent *entity = find_entity((char *)src, i);
if (entity != NULL) {
size_t len = strnlen((const char *)entity->utf8, 4);
cmark_strbuf_put(ob, entity->utf8, len);
return i + 1;
}
break;
}
}
}
return 0;
}
int
houdini_unescape_html(cmark_strbuf *ob, const uint8_t *src, size_t size)
{
size_t i = 0, org, ent;
while (i < size) {
org = i;
while (i < size && src[i] != '&')
i++;
if (likely(i > org)) {
if (unlikely(org == 0)) {
if (i >= size)
return 0;
cmark_strbuf_grow(ob, HOUDINI_UNESCAPED_SIZE(size));
}
cmark_strbuf_put(ob, src + org, i - org);
}
/* escaping */
if (i >= size)
break;
i++;
ent = houdini_unescape_ent(ob, src + i, size - i);
i += ent;
/* not really an entity */
if (ent == 0)
cmark_strbuf_putc(ob, '&');
}
return 1;
}
void houdini_unescape_html_f(cmark_strbuf *ob, const uint8_t *src, size_t size)
{
if (!houdini_unescape_html(ob, src, size))
cmark_strbuf_put(ob, src, size);
}
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