31db3f21ae
Now that we've gotten rid of the misguided character buffering in the tokenizer, it actually spits out character tokens that we have to deal with in the parser. This patch implements enough to bring us back to speed with simple.html
406 lines
12 KiB
C++
406 lines
12 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Utf32View.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/DocumentType.h>
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#include <LibWeb/DOM/ElementFactory.h>
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#include <LibWeb/DOM/HTMLFormElement.h>
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#include <LibWeb/DOM/HTMLHeadElement.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Parser/HTMLDocumentParser.h>
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#include <LibWeb/Parser/HTMLToken.h>
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namespace Web {
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HTMLDocumentParser::HTMLDocumentParser(const StringView& input)
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: m_tokenizer(input)
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{
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}
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HTMLDocumentParser::~HTMLDocumentParser()
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{
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}
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void HTMLDocumentParser::run()
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{
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m_document = adopt(*new Document);
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for (;;) {
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auto optional_token = m_tokenizer.next_token();
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if (!optional_token.has_value())
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return;
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auto& token = optional_token.value();
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dbg() << "[" << insertion_mode_name() << "] " << token.to_string();
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process_using_the_rules_for(m_insertion_mode, token);
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}
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}
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void HTMLDocumentParser::process_using_the_rules_for(InsertionMode mode, HTMLToken& token)
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{
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switch (mode) {
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case InsertionMode::Initial:
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handle_initial(token);
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break;
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case InsertionMode::BeforeHTML:
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handle_before_html(token);
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break;
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case InsertionMode::BeforeHead:
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handle_before_head(token);
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break;
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case InsertionMode::InHead:
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handle_in_head(token);
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break;
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case InsertionMode::InHeadNoscript:
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handle_in_head_noscript(token);
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break;
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case InsertionMode::AfterHead:
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handle_after_head(token);
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break;
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case InsertionMode::InBody:
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handle_in_body(token);
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break;
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case InsertionMode::AfterBody:
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handle_after_body(token);
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break;
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case InsertionMode::AfterAfterBody:
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handle_after_after_body(token);
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break;
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case InsertionMode::Text:
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handle_text(token);
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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}
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void HTMLDocumentParser::handle_initial(HTMLToken& token)
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{
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if (token.type() == HTMLToken::Type::DOCTYPE) {
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auto doctype = adopt(*new DocumentType(document()));
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doctype->set_name(token.m_doctype.name.to_string());
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document().append_child(move(doctype));
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m_insertion_mode = InsertionMode::BeforeHTML;
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_before_html(HTMLToken& token)
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{
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if (token.is_character() && token.is_parser_whitespace()) {
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return;
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}
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if (token.is_start_tag() && token.tag_name() == "html") {
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auto element = create_element_for(token);
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document().append_child(element);
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m_stack_of_open_elements.push(move(element));
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m_insertion_mode = InsertionMode::BeforeHead;
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return;
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}
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ASSERT_NOT_REACHED();
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}
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Element& HTMLDocumentParser::current_node()
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{
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return m_stack_of_open_elements.current_node();
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}
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RefPtr<Node> HTMLDocumentParser::find_appropriate_place_for_inserting_node()
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{
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auto& target = current_node();
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if (m_foster_parenting) {
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ASSERT_NOT_REACHED();
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}
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return target;
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}
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NonnullRefPtr<Element> HTMLDocumentParser::create_element_for(HTMLToken& token)
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{
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auto element = create_element(document(), token.tag_name());
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for (auto& attribute : token.m_tag.attributes) {
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element->set_attribute(attribute.name_builder.to_string(), attribute.value_builder.to_string());
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}
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return element;
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}
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RefPtr<Element> HTMLDocumentParser::insert_html_element(HTMLToken& token)
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{
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auto adjusted_insertion_location = find_appropriate_place_for_inserting_node();
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auto element = create_element_for(token);
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// FIXME: Check if it's possible to insert `element` at `adjusted_insertion_location`
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adjusted_insertion_location->append_child(element);
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m_stack_of_open_elements.push(element);
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return element;
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}
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void HTMLDocumentParser::handle_before_head(HTMLToken& token)
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{
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if (token.is_character() && token.is_parser_whitespace()) {
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return;
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}
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if (token.is_start_tag() && token.tag_name() == "head") {
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auto element = insert_html_element(token);
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m_head_element = to<HTMLHeadElement>(element);
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m_insertion_mode = InsertionMode::InHead;
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_in_head(HTMLToken& token)
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{
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if (token.is_start_tag() && token.tag_name() == "meta") {
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auto element = insert_html_element(token);
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m_stack_of_open_elements.pop();
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if (token.is_self_closing()) {
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ASSERT_NOT_REACHED();
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}
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return;
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}
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if (token.is_end_tag() && token.tag_name() == "head") {
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m_stack_of_open_elements.pop();
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m_insertion_mode = InsertionMode::AfterHead;
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_in_head_noscript(HTMLToken&)
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{
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::insert_character(u32 data)
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{
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auto adjusted_insertion_location = find_appropriate_place_for_inserting_node();
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if (adjusted_insertion_location->is_document())
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return;
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if (adjusted_insertion_location->last_child() && adjusted_insertion_location->last_child()->is_text()) {
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auto& existing_text_node = to<Text>(*adjusted_insertion_location->last_child());
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StringBuilder builder;
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builder.append(existing_text_node.data());
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builder.append(Utf32View { &data, 1 });
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existing_text_node.set_data(builder.to_string());
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return;
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}
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StringBuilder builder;
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builder.append(Utf32View { &data, 1 });
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adjusted_insertion_location->append_child(adopt(*new Text(document(), builder.to_string())));
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}
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void HTMLDocumentParser::handle_after_head(HTMLToken& token)
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{
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if (token.is_character()) {
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if (token.is_parser_whitespace()) {
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insert_character(token.codepoint());
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return;
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}
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ASSERT_NOT_REACHED();
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}
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if (token.is_comment()) {
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ASSERT_NOT_REACHED();
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}
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if (token.is_doctype()) {
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ASSERT_NOT_REACHED();
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}
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if (token.is_start_tag() && token.tag_name() == "html") {
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ASSERT_NOT_REACHED();
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}
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if (token.is_start_tag() && token.tag_name() == "body") {
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insert_html_element(token);
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m_frameset_ok = false;
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m_insertion_mode = InsertionMode::InBody;
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return;
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}
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if (token.is_start_tag() && token.tag_name() == "frameset") {
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ASSERT_NOT_REACHED();
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}
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{
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Vector<String> names = { "base", "basefont", "bgsound", "link", "meta", "noframes", "script", "style", "template", "title" };
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if (token.is_start_tag() && names.contains_slow(token.tag_name())) {
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ASSERT_NOT_REACHED();
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}
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}
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if (token.is_end_tag() && token.tag_name() == "template") {
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ASSERT_NOT_REACHED();
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}
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if (token.is_end_tag() && (token.tag_name() == "body" || token.tag_name() == "html" || token.tag_name() == "br")) {
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goto AnythingElse;
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}
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if ((token.is_start_tag() && token.tag_name() == "head") || token.is_end_tag()) {
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ASSERT_NOT_REACHED();
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}
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AnythingElse:
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HTMLToken fake_body_token;
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fake_body_token.m_type = HTMLToken::Type::StartTag;
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fake_body_token.m_tag.tag_name.append("body");
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insert_html_element(fake_body_token);
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m_insertion_mode = InsertionMode::InBody;
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// FIXME: Reprocess the current token in InBody!
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}
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void HTMLDocumentParser::generate_implied_end_tags()
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{
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Vector<String> names { "dd", "dt", "li", "optgroup", "option", "p", "rb", "rp", "rt", "rtc" };
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while (names.contains_slow(current_node().tag_name()))
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m_stack_of_open_elements.pop();
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}
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void HTMLDocumentParser::handle_after_body(HTMLToken& token)
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{
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if (token.is_character() && token.is_parser_whitespace()) {
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process_using_the_rules_for(InsertionMode::InBody, token);
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return;
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}
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if (token.is_end_tag() && token.tag_name() == "html") {
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if (m_parsing_fragment) {
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ASSERT_NOT_REACHED();
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}
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m_insertion_mode = InsertionMode::AfterAfterBody;
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_after_after_body(HTMLToken& token)
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{
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if (token.is_doctype() || token.is_parser_whitespace() || (token.is_start_tag() && token.tag_name() == "html")) {
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process_using_the_rules_for(InsertionMode::InBody, token);
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return;
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}
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if (token.is_end_of_file()) {
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dbg() << "Stop parsing! :^)";
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return;
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::reconstruct_the_active_formatting_elements()
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{
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if (m_list_of_active_formatting_elements.is_empty())
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return;
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_in_body(HTMLToken& token)
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{
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if (token.is_character()) {
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if (token.codepoint() == 0) {
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ASSERT_NOT_REACHED();
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}
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if (token.is_parser_whitespace()) {
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reconstruct_the_active_formatting_elements();
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insert_character(token.codepoint());
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return;
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}
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}
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if (token.is_end_tag() && token.tag_name() == "body") {
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if (!m_stack_of_open_elements.has_in_scope("body")) {
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ASSERT_NOT_REACHED();
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}
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// FIXME: Otherwise, if there is a node in the stack of open elements that is
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// not either a dd element, a dt element, an li element, an optgroup element,
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// an option element, a p element, an rb element, an rp element, an rt element,
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// an rtc element, a tbody element, a td element, a tfoot element, a th element,
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// a thead element, a tr element, the body element, or the html element,
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// then this is a parse error.
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m_insertion_mode = InsertionMode::AfterBody;
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return;
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}
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{
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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" };
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if (token.is_start_tag() && names.contains_slow(token.tag_name())) {
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// FIXME: If the stack of open elements has a p element in button scope, then close a p element.
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insert_html_element(token);
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return;
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}
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if (token.is_end_tag() && names.contains_slow(token.tag_name())) {
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// FIXME: If the stack of open elements has a p element in button scope, then close a p element.
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if (!m_stack_of_open_elements.has_in_scope(token.tag_name())) {
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ASSERT_NOT_REACHED();
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}
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generate_implied_end_tags();
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if (current_node().tag_name() != token.tag_name()) {
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ASSERT_NOT_REACHED();
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}
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m_stack_of_open_elements.pop();
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return;
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}
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}
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ASSERT_NOT_REACHED();
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}
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void HTMLDocumentParser::handle_text(HTMLToken&)
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{
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ASSERT_NOT_REACHED();
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}
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const char* HTMLDocumentParser::insertion_mode_name() const
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{
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switch (m_insertion_mode) {
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#define __ENUMERATE_INSERTION_MODE(mode) \
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case InsertionMode::mode: \
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return #mode;
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ENUMERATE_INSERTION_MODES
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#undef __ENUMERATE_INSERTION_MODE
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}
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ASSERT_NOT_REACHED();
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}
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Document& HTMLDocumentParser::document()
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{
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return *m_document;
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}
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}
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