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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/. */
#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 {
namespace 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 dom
} // namespace mozilla