static bool is_autolink(cmark_node *node) {
cmark_chunk *title;
cmark_chunk *url;
cmark_node *link_text;
char *realurl;
int realurllen;
if (node->type != CMARK_NODE_LINK) {
return false;
}
url = &node->as.link.url;
if (url->len == 0 || scan_scheme(url, 0) == 0) {
return false;
}
title = &node->as.link.title;
// if it has a title, we can't treat it as an autolink:
if (title->len > 0) {
return false;
}
link_text = node->first_child;
cmark_consolidate_text_nodes(link_text);
realurl = (char *)url->data;
realurllen = url->len;
if (strncmp(realurl, "mailto:", 7) == 0) {
realurl += 7;
realurllen -= 7;
}
return (realurllen == link_text->as.literal.len &&
strncmp(realurl, (char *)link_text->as.literal.data,
link_text->as.literal.len) == 0);
}
static link_type get_link_type(cmark_node *node) {
size_t title_len, url_len;
cmark_node *link_text;
char *realurl;
int realurllen;
bool isemail = false;
if (node->type != CMARK_NODE_LINK) {
return NO_LINK;
}
const char *url = cmark_node_get_url(node);
cmark_chunk url_chunk = cmark_chunk_literal(url);
if (url && *url == '#') {
return INTERNAL_LINK;
}
url_len = strlen(url);
if (url_len == 0 || scan_scheme(&url_chunk, 0) == 0) {
return NO_LINK;
}
const char *title = cmark_node_get_title(node);
title_len = strlen(title);
// if it has a title, we can't treat it as an autolink:
if (title_len == 0) {
link_text = node->first_child;
cmark_consolidate_text_nodes(link_text);
if (!link_text)
return NO_LINK;
realurl = (char *)url;
realurllen = (int)url_len;
if (strncmp(realurl, "mailto:", 7) == 0) {
realurl += 7;
realurllen -= 7;
isemail = true;
}
if (realurllen == link_text->as.literal.len &&
strncmp(realurl, (char *)link_text->as.literal.data,
link_text->as.literal.len) == 0) {
if (isemail) {
return EMAIL_AUTOLINK;
} else {
return URL_AUTOLINK;
}
}
}
return NORMAL_LINK;
}