1 files changed, 271 insertions, 0 deletions
diff --git a/dom/html/HTMLAnchorElement.cpp b/dom/html/HTMLAnchorElement.cpp
new file mode 100644
index 0000000000..a499522d23
--- /dev/null
+++ b/dom/html/HTMLAnchorElement.cpp
@@ -0,0 +1,271 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/HTMLAnchorElement.h"
+
+#include "mozilla/dom/BindContext.h"
+#include "mozilla/dom/HTMLAnchorElementBinding.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsCOMPtr.h"
+#include "nsContentUtils.h"
+#include "nsGkAtoms.h"
+#include "nsHTMLDNSPrefetch.h"
+#include "nsAttrValueOrString.h"
+#include "mozilla/dom/Document.h"
+#include "nsPresContext.h"
+#include "nsIURI.h"
+#include "nsWindowSizes.h"
+
+NS_IMPL_NS_NEW_HTML_ELEMENT(Anchor)
+
+namespace mozilla::dom {
+
+#define ANCHOR_ELEMENT_FLAG_BIT(n_) \
+  NODE_FLAG_BIT(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET + (n_))
+
+// Anchor element specific bits
+enum {
+  // Indicates that a DNS Prefetch has been requested from this Anchor elem
+  HTML_ANCHOR_DNS_PREFETCH_REQUESTED = ANCHOR_ELEMENT_FLAG_BIT(0),
+
+  // Indicates that a DNS Prefetch was added to the deferral queue
+  HTML_ANCHOR_DNS_PREFETCH_DEFERRED = ANCHOR_ELEMENT_FLAG_BIT(1)
+};
+
+ASSERT_NODE_FLAGS_SPACE(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET + 2);
+
+#undef ANCHOR_ELEMENT_FLAG_BIT
+
+// static
+const DOMTokenListSupportedToken HTMLAnchorElement::sSupportedRelValues[] = {
+    "noreferrer", "noopener", nullptr};
+
+HTMLAnchorElement::~HTMLAnchorElement() = default;
+
+bool HTMLAnchorElement::IsInteractiveHTMLContent() const {
+  return HasAttr(kNameSpaceID_None, nsGkAtoms::href) ||
+         nsGenericHTMLElement::IsInteractiveHTMLContent();
+}
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLAnchorElement,
+                                             nsGenericHTMLElement, Link)
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLAnchorElement, nsGenericHTMLElement,
+                                   mRelList)
+
+NS_IMPL_ELEMENT_CLONE(HTMLAnchorElement)
+
+JSObject* HTMLAnchorElement::WrapNode(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return HTMLAnchorElement_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+int32_t HTMLAnchorElement::TabIndexDefault() { return 0; }
+
+bool HTMLAnchorElement::Draggable() const {
+  // links can be dragged as long as there is an href and the
+  // draggable attribute isn't false
+  if (!HasAttr(kNameSpaceID_None, nsGkAtoms::href)) {
+    // no href, so just use the same behavior as other elements
+    return nsGenericHTMLElement::Draggable();
+  }
+
+  return !AttrValueIs(kNameSpaceID_None, nsGkAtoms::draggable,
+                      nsGkAtoms::_false, eIgnoreCase);
+}
+
+void HTMLAnchorElement::OnDNSPrefetchRequested() {
+  UnsetFlags(HTML_ANCHOR_DNS_PREFETCH_DEFERRED);
+  SetFlags(HTML_ANCHOR_DNS_PREFETCH_REQUESTED);
+}
+
+void HTMLAnchorElement::OnDNSPrefetchDeferred() {
+  UnsetFlags(HTML_ANCHOR_DNS_PREFETCH_REQUESTED);
+  SetFlags(HTML_ANCHOR_DNS_PREFETCH_DEFERRED);
+}
+
+bool HTMLAnchorElement::HasDeferredDNSPrefetchRequest() {
+  return HasFlag(HTML_ANCHOR_DNS_PREFETCH_DEFERRED);
+}
+
+nsresult HTMLAnchorElement::BindToTree(BindContext& aContext,
+                                       nsINode& aParent) {
+  Link::ResetLinkState(false, Link::ElementHasHref());
+
+  nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Prefetch links
+  if (IsInComposedDoc()) {
+    aContext.OwnerDoc().RegisterPendingLinkUpdate(this);
+    TryDNSPrefetch();
+  }
+
+  return rv;
+}
+
+void HTMLAnchorElement::UnbindFromTree(bool aNullParent) {
+  // Cancel any DNS prefetches
+  // Note: Must come before ResetLinkState.  If called after, it will recreate
+  // mCachedURI based on data that is invalid - due to a call to GetHostname.
+  CancelDNSPrefetch(HTML_ANCHOR_DNS_PREFETCH_DEFERRED,
+                    HTML_ANCHOR_DNS_PREFETCH_REQUESTED);
+
+  // Without removing the link state we risk a dangling pointer
+  // in the mStyledLinks hashtable
+  Link::ResetLinkState(false, Link::ElementHasHref());
+
+  nsGenericHTMLElement::UnbindFromTree(aNullParent);
+}
+
+bool HTMLAnchorElement::IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
+                                        int32_t* aTabIndex) {
+  if (nsGenericHTMLElement::IsHTMLFocusable(aWithMouse, aIsFocusable,
+                                            aTabIndex)) {
+    return true;
+  }
+
+  // cannot focus links if there is no link handler
+  if (!OwnerDoc()->LinkHandlingEnabled()) {
+    *aIsFocusable = false;
+    return false;
+  }
+
+  // Links that are in an editable region should never be focusable, even if
+  // they are in a contenteditable="false" region.
+  if (nsContentUtils::IsNodeInEditableRegion(this)) {
+    if (aTabIndex) {
+      *aTabIndex = -1;
+    }
+
+    *aIsFocusable = false;
+
+    return true;
+  }
+
+  if (GetTabIndexAttrValue().isNothing()) {
+    // check whether we're actually a link
+    if (!Link::HasURI()) {
+      // Not tabbable or focusable without href (bug 17605), unless
+      // forced to be via presence of nonnegative tabindex attribute
+      if (aTabIndex) {
+        *aTabIndex = -1;
+      }
+
+      *aIsFocusable = false;
+
+      return false;
+    }
+  }
+
+  if (aTabIndex && (sTabFocusModel & eTabFocus_linksMask) == 0) {
+    *aTabIndex = -1;
+  }
+
+  *aIsFocusable = true;
+
+  return false;
+}
+
+void HTMLAnchorElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
+  GetEventTargetParentForAnchors(aVisitor);
+}
+
+nsresult HTMLAnchorElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
+  return PostHandleEventForAnchors(aVisitor);
+}
+
+bool HTMLAnchorElement::IsLink(nsIURI** aURI) const { return IsHTMLLink(aURI); }
+
+void HTMLAnchorElement::GetLinkTarget(nsAString& aTarget) {
+  GetAttr(kNameSpaceID_None, nsGkAtoms::target, aTarget);
+  if (aTarget.IsEmpty()) {
+    GetBaseTarget(aTarget);
+  }
+}
+
+void HTMLAnchorElement::GetTarget(nsAString& aValue) {
+  if (!GetAttr(kNameSpaceID_None, nsGkAtoms::target, aValue)) {
+    GetBaseTarget(aValue);
+  }
+}
+
+nsDOMTokenList* HTMLAnchorElement::RelList() {
+  if (!mRelList) {
+    mRelList = new nsDOMTokenList(this, nsGkAtoms::rel, sSupportedRelValues);
+  }
+  return mRelList;
+}
+
+void HTMLAnchorElement::GetText(nsAString& aText, mozilla::ErrorResult& aRv) {
+  if (NS_WARN_IF(
+          !nsContentUtils::GetNodeTextContent(this, true, aText, fallible))) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+  }
+}
+
+void HTMLAnchorElement::SetText(const nsAString& aText, ErrorResult& aRv) {
+  aRv = nsContentUtils::SetNodeTextContent(this, aText, false);
+}
+
+void HTMLAnchorElement::ToString(nsAString& aSource) {
+  return GetHref(aSource);
+}
+
+already_AddRefed<nsIURI> HTMLAnchorElement::GetHrefURI() const {
+  nsCOMPtr<nsIURI> uri = Link::GetCachedURI();
+  if (uri) {
+    return uri.forget();
+  }
+
+  return GetHrefURIForAnchors();
+}
+
+nsresult HTMLAnchorElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                                          const nsAttrValueOrString* aValue,
+                                          bool aNotify) {
+  if (aNamespaceID == kNameSpaceID_None) {
+    if (aName == nsGkAtoms::href) {
+      CancelDNSPrefetch(HTML_ANCHOR_DNS_PREFETCH_DEFERRED,
+                        HTML_ANCHOR_DNS_PREFETCH_REQUESTED);
+    }
+  }
+
+  return nsGenericHTMLElement::BeforeSetAttr(aNamespaceID, aName, aValue,
+                                             aNotify);
+}
+
+nsresult HTMLAnchorElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                                         const nsAttrValue* aValue,
+                                         const nsAttrValue* aOldValue,
+                                         nsIPrincipal* aSubjectPrincipal,
+                                         bool aNotify) {
+  if (aNamespaceID == kNameSpaceID_None) {
+    if (aName == nsGkAtoms::href) {
+      Link::ResetLinkState(aNotify, !!aValue);
+      if (aValue && IsInComposedDoc()) {
+        TryDNSPrefetch();
+      }
+    }
+  }
+
+  return nsGenericHTMLElement::AfterSetAttr(
+      aNamespaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
+}
+
+EventStates HTMLAnchorElement::IntrinsicState() const {
+  return Link::LinkState() | nsGenericHTMLElement::IntrinsicState();
+}
+
+void HTMLAnchorElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
+                                               size_t* aNodeSize) const {
+  nsGenericHTMLElement::AddSizeOfExcludingThis(aSizes, aNodeSize);
+  *aNodeSize += Link::SizeOfExcludingThis(aSizes.mState);
+}
+
+}  // namespace mozilla::dom