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#include "html.hpp"
void Html::configure_tidy_doc(TidyDoc &doc) {
bool conf_success =
tidyOptSetBool(doc, TidyXmlOut, yes) &&
tidyOptSetBool(doc, TidyForceOutput, yes) &&
tidyOptSetBool(doc, TidyWarnPropAttrs, no) &&
tidyOptSetBool(doc, TidyShowWarnings, no) &&
tidyOptSetInt(doc, TidyShowErrors, 0);
if (!conf_success) {
throw std::runtime_error("Error with tidy configuration");
}
}
TidyDoc Html::tidy_doc_from_file(std::string path) {
TidyDoc doc = tidyCreate();
configure_tidy_doc(doc);
int res = tidyParseFile(doc, path.c_str());
if (res < 0) throw std::runtime_error("Error parsing HTML");
return doc;
}
std::string Html::convert_to_xml(TidyDoc doc) {
TidyBuffer out_buf = {0};
int res = -1;
// res: 0=ok; 1=warnings; 2=errors
res = tidyCleanAndRepair(doc);
if (res >= 0) res = tidySaveBuffer(doc, &out_buf);
if (res < 0) throw std::runtime_error("Error parsing HTML");
std::string xml = (char*) out_buf.bp;
tidyBufFree(&out_buf);
tidyRelease(doc);
return xml;
}
void Html::remove_useless_children(xml_node &root) {
for (auto name: USELESS_CHILDREN) {
xpath_node_set nodes = root.select_nodes(("//"+name).c_str());
for (xpath_node node: nodes) {
node.node().parent().remove_child(node.node());
}
}
}
Html::Html(TidyDoc &tdoc) {
std::string xml = convert_to_xml(tdoc);
xml_parse_result res = doc.load_string(xml.c_str());
if (!res) {
throw std::runtime_error("Error parsing XML file");
}
head = doc.document_element().child("head");
}
xml_node Html::get_body_node() {
xml_node body_node = doc.document_element().child("body");
remove_useless_children(body_node);
return body_node;
}
Html::Html(std::string path) {
std::string xml = convert_to_xml(tidy_doc_from_file(path));
xml_parse_result res = doc.load_string(xml.c_str());
if (!res) {
throw std::runtime_error("Error parsing XML file: "+path);
}
head = doc.document_element().child("head");
}
Html Html::from_string(std::string s) {
TidyDoc doc = tidyCreate();
configure_tidy_doc(doc);
int res = tidyParseString(doc, s.c_str());
if (res < 0) throw std::runtime_error("Error parsing HTML");
return Html(doc);
}
std::string Html::get_title() {
if (title.empty()) {
title = head.child("title").text().as_string();
}
return title;
}
std::string Html::get_icon_url() {
if (icon_url.empty()) {
std::string rel, size_s;
int size = -1;
for (
xml_node link = head.child("link");
link;
link = link.next_sibling("link")
) {
rel = link.attribute("rel").value();
if (
rel == "apple-touch-icon" ||
rel == "apple-touch-icon-precomposed"
) {
size_s = link.attribute("size").value();
if (size_s.empty())
size_s = link.attribute("sizes").value();
if (!size_s.empty()) {
int n_size = std::stoi(
SynDomUtils::split(size_s, 'x')[0]
);
if (n_size <= size) continue;
size = n_size;
}
icon_url = link.attribute("href").value();
if (!icon_url.empty() && (size <= 0 || size >= 180)) break;
}
}
if (!icon_url.empty()) return icon_url;
for (
xml_node link = head.child("link");
link;
link = link.next_sibling("link")
) {
rel = link.attribute("rel").value();
if (rel == "icon" || rel == "shortcut icon") {
icon_url = link.attribute("href").value();
if (!icon_url.empty()) break;
}
}
}
return icon_url;
}
std::string Html::get_img_url() {
if (img_url.empty()) {
std::string property, name;
for (
xml_node meta = head.child("meta");
meta;
meta = meta.next_sibling("meta")
) {
property = meta.attribute("property").value();
name = meta.attribute("name").value();
if (
property == "og:image" || property == "image" ||
property == "twitter:image" ||
name == "og:image" || name == "image" ||
name == "twitter:image"
) {
img_url = meta.attribute("content").value();
if (!img_url.empty()) break;
}
}
}
return img_url;
}
std::string Html::get_rss_url() {
if (rss_url.empty()) {
std::string rel, type;
for (
xml_node link = head.child("link");
link;
link = link.next_sibling("link")
) {
rel = link.attribute("rel").value();
type = link.attribute("type").value();
if (rel == "alternate" && (
type == "application/rss+xml" ||
type == "application/atom+xml"
)) {
rss_url = link.attribute("href").value();
if (!rss_url.empty()) break;
}
}
}
return rss_url;
}
std::string Html::get_body() {
if (body.empty()) {
xml_node body_node = get_body_node();
SynDomUtils::xml_string_writer writer;
body_node.print(writer, "");
body = writer.result;
}
return body;
}
std::string Html::get_article() {
if (article.empty()) {
xml_node body_node = doc.document_element().child("body");
xml_node article_node = body_node.find_child([](xml_node n){
return std::strcmp(n.name(), "article") == 0;
});
SynDomUtils::xml_string_writer writer;
if (article_node) {
remove_useless_children(article_node);
article_node.print(writer, "");
article = writer.result;
}
else {
xml_node clean_body_node = get_body_node();
clean_body_node.set_name("article");
SynDomUtils::xml_string_writer writer;
clean_body_node.print(writer, "");
article = writer.result;
}
}
return article;
}
std::string Html::get_description() {
if (description.empty()) {
std::string property;
for (
xml_node meta = head.child("meta");
meta;
meta = meta.next_sibling("meta")
) {
property = meta.attribute("property").value();
if (
property == "og:description" ||
property == "description"
) {
description = meta.attribute("content").value();
if (!description.empty()) break;
}
}
}
return description;
}
std::string Html::to_json(bool metadata_only) {
std::string res = "{\n"
"\t\"title\": \"" + get_title() + "\",\n"
"\t\"icon_url\": \"" + get_icon_url() + "\",\n"
"\t\"img_url\": \"" + get_img_url() + "\",\n"
"\t\"rss_url\": \"" + get_rss_url() + "\",\n"
"\t\"description\": \"" + get_description() + "\"";
if (!metadata_only) {
res += ",\n"
"\t\"body\": \"" + get_body() + "\",\n"
"\t\"article\": \"" + get_article() + "\"\n"
"}\n";
}
else {
res += "\n}\n";
}
return res;
}
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