1 files changed, 134 insertions, 0 deletions
diff --git a/accessible/html/HTMLLinkAccessible.cpp b/accessible/html/HTMLLinkAccessible.cpp
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+++ b/accessible/html/HTMLLinkAccessible.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "HTMLLinkAccessible.h"
+
+#include "CacheConstants.h"
+#include "nsCoreUtils.h"
+#include "DocAccessible.h"
+#include "Role.h"
+#include "States.h"
+
+#include "nsContentUtils.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/MutationEventBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// HTMLLinkAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+HTMLLinkAccessible::HTMLLinkAccessible(nsIContent* aContent,
+                                       DocAccessible* aDoc)
+    : HyperTextAccessibleWrap(aContent, aDoc) {
+  mType = eHTMLLinkType;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIAccessible
+
+role HTMLLinkAccessible::NativeRole() const { return roles::LINK; }
+
+uint64_t HTMLLinkAccessible::NativeState() const {
+  return HyperTextAccessibleWrap::NativeState() & ~states::READONLY;
+}
+
+uint64_t HTMLLinkAccessible::NativeLinkState() const {
+  dom::ElementState state = mContent->AsElement()->State();
+  if (state.HasState(dom::ElementState::UNVISITED)) {
+    return states::LINKED;
+  }
+
+  if (state.HasState(dom::ElementState::VISITED)) {
+    return states::LINKED | states::TRAVERSED;
+  }
+
+  // This is a either named anchor (a link with also a name attribute) or
+  // it doesn't have any attributes. Check if 'click' event handler is
+  // registered, otherwise bail out.
+  return nsCoreUtils::HasClickListener(mContent) ? states::LINKED : 0;
+}
+
+uint64_t HTMLLinkAccessible::NativeInteractiveState() const {
+  uint64_t state = HyperTextAccessibleWrap::NativeInteractiveState();
+
+  // This is how we indicate it is a named anchor. In other words, this anchor
+  // can be selected as a location :) There is no other better state to use to
+  // indicate this.
+  if (mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::name)) {
+    state |= states::SELECTABLE;
+  }
+
+  return state;
+}
+
+void HTMLLinkAccessible::Value(nsString& aValue) const {
+  aValue.Truncate();
+
+  HyperTextAccessible::Value(aValue);
+  if (aValue.IsEmpty()) {
+    nsContentUtils::GetLinkLocation(mContent->AsElement(), aValue);
+  }
+}
+
+bool HTMLLinkAccessible::HasPrimaryAction() const {
+  return IsLinked() || HyperTextAccessible::HasPrimaryAction();
+  ;
+}
+
+void HTMLLinkAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  aName.Truncate();
+
+  if (!IsLinked()) {
+    HyperTextAccessible::ActionNameAt(aIndex, aName);
+    return;
+  }
+
+  // Action 0 (default action): Jump to link
+  if (aIndex == eAction_Jump) aName.AssignLiteral("jump");
+}
+
+bool HTMLLinkAccessible::AttributeChangesState(nsAtom* aAttribute) {
+  return aAttribute == nsGkAtoms::href ||
+         HyperTextAccessibleWrap::AttributeChangesState(aAttribute);
+}
+
+void HTMLLinkAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
+                                             nsAtom* aAttribute,
+                                             int32_t aModType,
+                                             const nsAttrValue* aOldValue,
+                                             uint64_t aOldState) {
+  HyperTextAccessibleWrap::DOMAttributeChanged(aNameSpaceID, aAttribute,
+                                               aModType, aOldValue, aOldState);
+
+  if (aAttribute == nsGkAtoms::href &&
+      (aModType == dom::MutationEvent_Binding::ADDITION ||
+       aModType == dom::MutationEvent_Binding::REMOVAL)) {
+    SendCache(CacheDomain::Actions, CacheUpdateType::Update);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// HyperLinkAccessible
+
+bool HTMLLinkAccessible::IsLink() const {
+  // Expose HyperLinkAccessible unconditionally.
+  return true;
+}
+
+already_AddRefed<nsIURI> HTMLLinkAccessible::AnchorURIAt(
+    uint32_t aAnchorIndex) const {
+  return aAnchorIndex == 0 ? mContent->AsElement()->GetHrefURI() : nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// HTMLLinkAccessible
+
+bool HTMLLinkAccessible::IsLinked() const {
+  dom::ElementState state = mContent->AsElement()->State();
+  return state.HasAtLeastOneOfStates(dom::ElementState::VISITED_OR_UNVISITED);
+}