text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <AK/ByteBuffer.h>
  #include <AK/URL.h>
  #include <LibWeb/CSS/Parser/CSSParser.h>
  #include <LibWeb/DOM/Document.h>
  #include <LibWeb/HTML/HTMLLinkElement.h>
  #include <LibWeb/Loader/ResourceLoader.h>
  
  namespace Web::HTML {
  
  HTMLLinkElement::HTMLLinkElement(DOM::Document& document, QualifiedName qualified_name)
      : HTMLElement(document, move(qualified_name))
  {
  }
  
  HTMLLinkElement::~HTMLLinkElement()
  {
  }
  
  void HTMLLinkElement::inserted_into(Node& node)
  {
      HTMLElement::inserted_into(node);
  
      if (m_relationship & Relationship::Stylesheet && !(m_relationship & Relationship::Alternate))
          load_stylesheet(document().complete_url(href()));
  }
  
  void HTMLLinkElement::resource_did_fail()
  {
  }
  
  void HTMLLinkElement::resource_did_load()
  {
      ASSERT(resource());
      if (!resource()->has_encoded_data())
          return;
  
      dbgln("HTMLLinkElement: Resource did load, looks good! {}", href());
  
      auto sheet = parse_css(CSS::ParsingContext(document()), resource()->encoded_data());
      if (!sheet) {
          dbgln("HTMLLinkElement: Failed to parse stylesheet: {}", href());
          return;
      }
  
      // Transfer the rules from the successfully parsed sheet into the sheet we've already inserted.
      m_style_sheet->rules() = sheet->rules();
  
      document().update_style();
  }
  
  void HTMLLinkElement::load_stylesheet(const URL& url)
  {
      // First insert an empty style sheet in the document sheet list.
      // There's probably a nicer way to do this, but this ensures that sheets are in document order.
      m_style_sheet = CSS::StyleSheet::create({});
      document().style_sheets().add_sheet(*m_style_sheet);
  
      LoadRequest request;
      request.set_url(url);
      set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
  }
  
  void HTMLLinkElement::parse_attribute(const FlyString& name, const String& value)
  {
      if (name == HTML::AttributeNames::rel) {
          m_relationship = 0;
          auto parts = value.split_view(' ');
          for (auto& part : parts) {
              if (part == "stylesheet")
                  m_relationship |= Relationship::Stylesheet;
              else if (part == "alternate")
                  m_relationship |= Relationship::Alternate;
          }
      }
  }
  
  }
  