text: /*
   * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
   * Copyright (C) 2011 Google Inc. All rights reserved.
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   *
   */
  
  #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_LINK_ELEMENT_H_
  #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_LINK_ELEMENT_H_
  
  #include <memory>
  #include "base/single_thread_task_runner.h"
  #include "third_party/blink/renderer/core/core_export.h"
  #include "third_party/blink/renderer/core/dom/create_element_flags.h"
  #include "third_party/blink/renderer/core/dom/dom_token_list.h"
  #include "third_party/blink/renderer/core/dom/increment_load_event_delay_count.h"
  #include "third_party/blink/renderer/core/html/html_element.h"
  #include "third_party/blink/renderer/core/html/link_rel_attribute.h"
  #include "third_party/blink/renderer/core/html/link_resource.h"
  #include "third_party/blink/renderer/core/html/link_style.h"
  #include "third_party/blink/renderer/core/html/rel_list.h"
  #include "third_party/blink/renderer/core/loader/link_loader.h"
  #include "third_party/blink/renderer/core/loader/link_loader_client.h"
  #include "third_party/blink/renderer/platform/bindings/trace_wrapper_member.h"
  
  namespace blink {
  
  class KURL;
  class LinkImport;
  struct LinkLoadParameters;
  
  class CORE_EXPORT HTMLLinkElement final : public HTMLElement,
                                            public LinkLoaderClient {
    DEFINE_WRAPPERTYPEINFO();
    USING_GARBAGE_COLLECTED_MIXIN(HTMLLinkElement);
  
   public:
    static HTMLLinkElement* Create(Document&, const CreateElementFlags);
    ~HTMLLinkElement() override;
  
    KURL Href() const;
    const AtomicString& Rel() const;
    String Media() const { return media_; }
    String TypeValue() const { return type_; }
    String AsValue() const { return as_; }
    String IntegrityValue() const { return integrity_; }
    ReferrerPolicy GetReferrerPolicy() const { return referrer_policy_; }
    const LinkRelAttribute& RelAttribute() const { return rel_attribute_; }
    DOMTokenList& relList() const {
      return static_cast<DOMTokenList&>(*rel_list_);
    }
    String Scope() const { return scope_; }
  
    const AtomicString& GetType() const;
  
    IconType GetIconType() const;
  
    // the icon sizes as parsed from the HTML attribute
    const Vector<IntSize>& IconSizes() const;
  
    bool Async() const;
  
    CSSStyleSheet* sheet() const {
      return GetLinkStyle() ? GetLinkStyle()->Sheet() : nullptr;
    }
    Document* import() const;
  
    bool StyleSheetIsLoading() const;
  
    bool IsImport() const { return GetLinkImport(); }
    bool IsDisabled() const {
      return GetLinkStyle() && GetLinkStyle()->IsDisabled();
    }
    bool IsEnabledViaScript() const {
      return GetLinkStyle() && GetLinkStyle()->IsEnabledViaScript();
    }
  
    DOMTokenList* sizes() const;
  
    void ScheduleEvent();
  
    // From LinkLoaderClient
    bool ShouldLoadLink() override;
  
    // For LinkStyle
    bool LoadLink(const LinkLoadParameters&);
    bool IsAlternate() const {
      return GetLinkStyle()->IsUnset() && rel_attribute_.IsAlternate();
    }
    bool ShouldProcessStyle() {
      return LinkResourceToProcess() && GetLinkStyle();
    }
    bool IsCreatedByParser() const { return created_by_parser_; }
  
    void Trace(blink::Visitor*) override;
  
    void TraceWrappers(ScriptWrappableVisitor*) const override;
  
   private:
    HTMLLinkElement(Document&, const CreateElementFlags);
  
    LinkStyle* GetLinkStyle() const;
    LinkImport* GetLinkImport() const;
    LinkResource* LinkResourceToProcess();
  
    void Process();
    static void ProcessCallback(Node*);
  
    // Always call this asynchronously because this can cause synchronous
    // Document load event and JavaScript execution.
    void DispatchPendingEvent(std::unique_ptr<IncrementLoadEventDelayCount>);
  
    // From Node and subclassses
    void ParseAttribute(const AttributeModificationParams&) override;
    InsertionNotificationRequest InsertedInto(ContainerNode*) override;
    void RemovedFrom(ContainerNode*) override;
    bool IsURLAttribute(const Attribute&) const override;
    bool HasLegalLinkAttribute(const QualifiedName&) const override;
    const QualifiedName& SubResourceAttributeName() const override;
    bool SheetLoaded() override;
    void NotifyLoadedSheetAndAllCriticalSubresources(
        LoadedSheetErrorStatus) override;
    void StartLoadingDynamicSheet() override;
    void FinishParsingChildren() override;
    bool HasActivationBehavior() const override;
  
    // From LinkLoaderClient
    void LinkLoaded() override;
    void LinkLoadingErrored() override;
    void DidStartLinkPrerender() override;
    void DidStopLinkPrerender() override;
    void DidSendLoadForLinkPrerender() override;
    void DidSendDOMContentLoadedForLinkPrerender() override;
    scoped_refptr<base::SingleThreadTaskRunner> GetLoadingTaskRunner() override;
  
    Member<LinkResource> link_;
    Member<LinkLoader> link_loader_;
  
    String type_;
    String as_;
    String media_;
    String integrity_;
    ReferrerPolicy referrer_policy_;
    Member<DOMTokenList> sizes_;
    Vector<IntSize> icon_sizes_;
    TraceWrapperMember<RelList> rel_list_;
    LinkRelAttribute rel_attribute_;
    String scope_;
  
    bool created_by_parser_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_LINK_ELEMENT_H_
  