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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_HTMLLinkElement_h
+#define mozilla_dom_HTMLLinkElement_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/HTMLDNSPrefetch.h"
+#include "mozilla/dom/LinkStyle.h"
+#include "mozilla/dom/Link.h"
+#include "mozilla/WeakPtr.h"
+#include "nsGenericHTMLElement.h"
+#include "nsDOMTokenList.h"
+
+namespace mozilla {
+class EventChainPostVisitor;
+class EventChainPreVisitor;
+class PreloaderBase;
+
+namespace dom {
+
+class HTMLLinkElement final : public nsGenericHTMLElement,
+ public LinkStyle,
+ public SupportsDNSPrefetch {
+ public:
+ explicit HTMLLinkElement(
+ already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+ // nsISupports
+ NS_DECL_ISUPPORTS_INHERITED
+
+ // CC
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLLinkElement,
+ nsGenericHTMLElement)
+
+ NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLLinkElement, link);
+ NS_DECL_ADDSIZEOFEXCLUDINGTHIS
+
+ void LinkAdded();
+ void LinkRemoved();
+
+ // nsINode
+ nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+ JSObject* WrapNode(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ // nsIContent
+ nsresult BindToTree(BindContext&, nsINode& aParent) override;
+ void UnbindFromTree(bool aNullParent = true) override;
+ void BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+ const nsAttrValue* aValue, bool aNotify) override;
+ void AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+ const nsAttrValue* aValue, const nsAttrValue* aOldValue,
+ nsIPrincipal* aSubjectPrincipal, bool aNotify) override;
+ // Element
+ bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+ const nsAString& aValue,
+ nsIPrincipal* aMaybeScriptedPrincipal,
+ nsAttrValue& aResult) override;
+
+ void CreateAndDispatchEvent(Document* aDoc, const nsAString& aEventName);
+
+ // WebIDL
+ bool Disabled() const;
+ void SetDisabled(bool aDisabled, ErrorResult& aRv);
+
+ nsIURI* GetURI() {
+ if (!mCachedURI) {
+ GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(mCachedURI));
+ }
+ return mCachedURI.get();
+ }
+
+ void GetHref(nsAString& aValue) {
+ GetURIAttr(nsGkAtoms::href, nullptr, aValue);
+ }
+ void SetHref(const nsAString& aHref, nsIPrincipal* aTriggeringPrincipal,
+ ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::href, aHref, aTriggeringPrincipal, aRv);
+ }
+ void SetHref(const nsAString& aHref, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::href, aHref, aRv);
+ }
+ void GetCrossOrigin(nsAString& aResult) {
+ // Null for both missing and invalid defaults is ok, since we
+ // always parse to an enum value, so we don't need an invalid
+ // default, and we _want_ the missing default to be null.
+ GetEnumAttr(nsGkAtoms::crossorigin, nullptr, aResult);
+ }
+ void SetCrossOrigin(const nsAString& aCrossOrigin, ErrorResult& aError) {
+ SetOrRemoveNullableStringAttr(nsGkAtoms::crossorigin, aCrossOrigin, aError);
+ }
+ // nsAString for WebBrowserPersistLocalDocument
+ void GetRel(nsAString& aValue) { GetHTMLAttr(nsGkAtoms::rel, aValue); }
+ void SetRel(const nsAString& aRel, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::rel, aRel, aRv);
+ }
+ nsDOMTokenList* RelList();
+ void GetMedia(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::media, aValue); }
+ void SetMedia(const nsAString& aMedia, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::media, aMedia, aRv);
+ }
+ void GetHreflang(DOMString& aValue) {
+ GetHTMLAttr(nsGkAtoms::hreflang, aValue);
+ }
+ void SetHreflang(const nsAString& aHreflang, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::hreflang, aHreflang, aRv);
+ }
+ void GetAs(nsAString& aResult);
+ void SetAs(const nsAString& aAs, ErrorResult& aRv) {
+ SetAttr(nsGkAtoms::as, aAs, aRv);
+ }
+
+ nsDOMTokenList* Sizes() {
+ if (!mSizes) {
+ mSizes = new nsDOMTokenList(this, nsGkAtoms::sizes);
+ }
+ return mSizes;
+ }
+ void GetType(nsAString& aValue) { GetHTMLAttr(nsGkAtoms::type, aValue); }
+ void SetType(const nsAString& aType, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::type, aType, aRv);
+ }
+ void GetCharset(nsAString& aValue) override {
+ GetHTMLAttr(nsGkAtoms::charset, aValue);
+ }
+ void SetCharset(const nsAString& aCharset, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::charset, aCharset, aRv);
+ }
+ void GetRev(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::rev, aValue); }
+ void SetRev(const nsAString& aRev, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::rev, aRev, aRv);
+ }
+ void GetTarget(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::target, aValue); }
+ void SetTarget(const nsAString& aTarget, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::target, aTarget, aRv);
+ }
+ void GetIntegrity(nsAString& aIntegrity) const {
+ GetHTMLAttr(nsGkAtoms::integrity, aIntegrity);
+ }
+ void SetIntegrity(const nsAString& aIntegrity, ErrorResult& aRv) {
+ SetHTMLAttr(nsGkAtoms::integrity, aIntegrity, aRv);
+ }
+ void SetReferrerPolicy(const nsAString& aReferrer, ErrorResult& aError) {
+ SetHTMLAttr(nsGkAtoms::referrerpolicy, aReferrer, aError);
+ }
+ void GetReferrerPolicy(nsAString& aReferrer) {
+ GetEnumAttr(nsGkAtoms::referrerpolicy, "", aReferrer);
+ }
+ void GetImageSrcset(nsAString& aImageSrcset) {
+ GetHTMLAttr(nsGkAtoms::imagesrcset, aImageSrcset);
+ }
+ void SetImageSrcset(const nsAString& aImageSrcset, ErrorResult& aError) {
+ SetHTMLAttr(nsGkAtoms::imagesrcset, aImageSrcset, aError);
+ }
+ void GetImageSizes(nsAString& aImageSizes) {
+ GetHTMLAttr(nsGkAtoms::imagesizes, aImageSizes);
+ }
+ void SetImageSizes(const nsAString& aImageSizes, ErrorResult& aError) {
+ SetHTMLAttr(nsGkAtoms::imagesizes, aImageSizes, aError);
+ }
+
+ CORSMode GetCORSMode() const {
+ return AttrValueToCORSMode(GetParsedAttr(nsGkAtoms::crossorigin));
+ }
+
+ void NodeInfoChanged(Document* aOldDoc) final {
+ mCachedURI = nullptr;
+ nsGenericHTMLElement::NodeInfoChanged(aOldDoc);
+ }
+
+ protected:
+ virtual ~HTMLLinkElement();
+
+ void GetContentPolicyMimeTypeMedia(nsAttrValue& aAsAttr,
+ nsContentPolicyType& aPolicyType,
+ nsString& aMimeType, nsAString& aMedia);
+ void TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
+ void UpdatePreload(nsAtom* aName, const nsAttrValue* aValue,
+ const nsAttrValue* aOldValue);
+ void CancelPrefetchOrPreload();
+
+ void StartPreload(nsContentPolicyType policyType);
+ void CancelPreload();
+
+ // Returns whether the type attribute specifies the text/css mime type for
+ // link elements.
+ static bool IsCSSMimeTypeAttributeForLinkElement(
+ const mozilla::dom::Element&);
+
+ // LinkStyle
+ nsIContent& AsContent() final { return *this; }
+ const LinkStyle* AsLinkStyle() const final { return this; }
+ Maybe<SheetInfo> GetStyleSheetInfo() final;
+
+ RefPtr<nsDOMTokenList> mRelList;
+ RefPtr<nsDOMTokenList> mSizes;
+
+ // A weak reference to our preload is held only to cancel the preload when
+ // this node updates or unbounds from the tree. We want to prevent cycles,
+ // the preload is held alive by other means.
+ WeakPtr<PreloaderBase> mPreload;
+
+ // The cached href attribute value.
+ nsCOMPtr<nsIURI> mCachedURI;
+
+ // The "explicitly enabled" flag. This flag is set whenever the `disabled`
+ // attribute is explicitly unset, and makes alternate stylesheets not be
+ // disabled by default anymore.
+ //
+ // See https://github.com/whatwg/html/issues/3840#issuecomment-481034206.
+ bool mExplicitlyEnabled = false;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_HTMLLinkElement_h