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LibWeb: Implement enough HTML parsing to handle a small simple DOM :^)

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We can now parse a little DOM like this:

<!DOCTYPE html>
<html>
    <head></head>
    <body>
        <div></div>
    </body>
</html>

This is pretty slow work, but the incremental progress is satisfying!
This commit is contained in:
Andreas Kling 2020-05-24 00:49:22 +02:00
parent fd1b31d0ff
commit e44c87cfff
5 changed files with 110 additions and 6 deletions
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100
Libraries/LibWeb/Parser/HTMLDocumentParser.cpp
View file

@ -55,9 +55,6 @@ void HTMLDocumentParser::run()
dbg() << "[" << insertion_mode_name() << "] " << token.to_string();
if (token.type() == HTMLToken::Type::EndOfFile)
return;
switch (m_insertion_mode) {
case InsertionMode::Initial:
handle_initial(token);
@ -80,6 +77,12 @@ void HTMLDocumentParser::run()
case InsertionMode::InBody:
handle_in_body(token);
break;
case InsertionMode::AfterBody:
handle_after_body(token);
break;
case InsertionMode::AfterAfterBody:
handle_after_after_body(token);
break;
case InsertionMode::Text:
handle_text(token);
break;
@ -199,7 +202,10 @@ void HTMLDocumentParser::handle_after_head(HTMLToken& token)
}
if (token.is_start_tag() && token.tag_name() == "body") {
ASSERT_NOT_REACHED();
insert_html_element(token);
m_frameset_ok = false;
m_insertion_mode = InsertionMode::InBody;
return;
}
if (token.is_start_tag() && token.tag_name() == "frameset") {
@ -231,10 +237,94 @@ AnythingElse:
fake_body_token.m_tag.tag_name.append("body");
insert_html_element(fake_body_token);
m_insertion_mode = InsertionMode::InBody;
// FIXME: Reprocess the current token in InBody!
}
void HTMLDocumentParser::handle_in_body(HTMLToken&)
void HTMLDocumentParser::generate_implied_end_tags()
{
Vector<String> names { "dd", "dt", "li", "optgroup", "option", "p", "rb", "rp", "rt", "rtc" };
while (names.contains_slow(current_node()->tag_name()))
m_stack_of_open_elements.take_last();
}
bool HTMLDocumentParser::stack_of_open_elements_has_element_with_tag_name_in_scope(const FlyString& tag_name)
{
Vector<String> list { "applet", "caption", "html", "table", "td", "th", "marquee", "object", "template" };
for (ssize_t i = m_stack_of_open_elements.size() - 1; i >= 0; --i) {
auto& node = m_stack_of_open_elements.at(i);
if (node.tag_name() == tag_name)
return true;
if (list.contains_slow(node.tag_name()))
return false;
}
ASSERT_NOT_REACHED();
}
void HTMLDocumentParser::handle_after_body(HTMLToken& token)
{
if (token.is_end_tag() && token.tag_name() == "html") {
if (m_parsing_fragment) {
ASSERT_NOT_REACHED();
}
m_insertion_mode = InsertionMode::AfterAfterBody;
return;
}
ASSERT_NOT_REACHED();
}
void HTMLDocumentParser::handle_after_after_body(HTMLToken& token)
{
if (token.is_end_of_file()) {
dbg() << "Stop parsing! :^)";
return;
}
ASSERT_NOT_REACHED();
}
void HTMLDocumentParser::handle_in_body(HTMLToken& token)
{
if (token.is_end_tag() && token.tag_name() == "body") {
if (!stack_of_open_elements_has_element_with_tag_name_in_scope("body")) {
ASSERT_NOT_REACHED();
}
// FIXME: Otherwise, if there is a node in the stack of open elements that is
// not either a dd element, a dt element, an li element, an optgroup element,
// an option element, a p element, an rb element, an rp element, an rt element,
// an rtc element, a tbody element, a td element, a tfoot element, a th element,
// a thead element, a tr element, the body element, or the html element,
// then this is a parse error.
m_insertion_mode = InsertionMode::AfterBody;
return;
}
{
Vector<String> names { "address", "article", "aside", "blockquote", "center", "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure", "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p", "section", "summary", "ul" };
if (token.is_start_tag() && names.contains_slow(token.tag_name())) {
// FIXME: If the stack of open elements has a p element in button scope, then close a p element.
insert_html_element(token);
return;
}
if (token.is_end_tag() && names.contains_slow(token.tag_name())) {
// FIXME: If the stack of open elements has a p element in button scope, then close a p element.
if (!stack_of_open_elements_has_element_with_tag_name_in_scope(token.tag_name())) {
ASSERT_NOT_REACHED();
}
generate_implied_end_tags();
if (current_node()->tag_name() != token.tag_name()) {
ASSERT_NOT_REACHED();
}
m_stack_of_open_elements.take_last();
return;
}
}
ASSERT_NOT_REACHED();
}