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-rw-r--r--dom/base/nsDOMAttributeMap.cpp405
1 files changed, 405 insertions, 0 deletions
diff --git a/dom/base/nsDOMAttributeMap.cpp b/dom/base/nsDOMAttributeMap.cpp
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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/. */
+
+/*
+ * Implementation of the |attributes| property of DOM Core's Element object.
+ */
+
+#include "nsDOMAttributeMap.h"
+
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/dom/Attr.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/NamedNodeMapBinding.h"
+#include "mozilla/dom/NodeInfoInlines.h"
+#include "nsAttrName.h"
+#include "nsContentUtils.h"
+#include "nsError.h"
+#include "nsIContentInlines.h"
+#include "mozilla/dom/Document.h"
+#include "nsNameSpaceManager.h"
+#include "nsNodeInfoManager.h"
+#include "nsUnicharUtils.h"
+#include "nsWrapperCacheInlines.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+//----------------------------------------------------------------------
+
+nsDOMAttributeMap::nsDOMAttributeMap(Element* aContent) : mContent(aContent) {
+ // We don't add a reference to our content. If it goes away,
+ // we'll be told to drop our reference
+}
+
+nsDOMAttributeMap::~nsDOMAttributeMap() { DropReference(); }
+
+void nsDOMAttributeMap::DropReference() {
+ for (auto iter = mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
+ iter.Data()->SetMap(nullptr);
+ iter.Remove();
+ }
+ mContent = nullptr;
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsDOMAttributeMap)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMAttributeMap)
+ tmp->DropReference();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mContent)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMAttributeMap)
+ for (const auto& entry : tmp->mAttributeCache) {
+ cb.NoteXPCOMChild(static_cast<nsINode*>(entry.GetWeak()));
+ }
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMAttributeMap)
+ if (tmp->HasKnownLiveWrapper()) {
+ if (tmp->mContent) {
+ // The map owns the element so we can mark it when the
+ // map itself is certainly alive.
+ mozilla::dom::FragmentOrElement::MarkNodeChildren(tmp->mContent);
+ }
+ return true;
+ }
+ if (tmp->mContent &&
+ mozilla::dom::FragmentOrElement::CanSkip(tmp->mContent, true)) {
+ return true;
+ }
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMAttributeMap)
+ return tmp->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMAttributeMap)
+ return tmp->HasKnownLiveWrapper();
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
+
+// QueryInterface implementation for nsDOMAttributeMap
+
+NS_INTERFACE_MAP_BEGIN(nsDOMAttributeMap)
+ NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+ NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMAttributeMap)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMAttributeMap)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMAttributeMap)
+
+nsresult nsDOMAttributeMap::SetOwnerDocument(Document* aDocument) {
+ for (const auto& entry : mAttributeCache.Values()) {
+ nsresult rv = entry->SetOwnerDocument(aDocument);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+ }
+ return NS_OK;
+}
+
+void nsDOMAttributeMap::DropAttribute(int32_t aNamespaceID,
+ nsAtom* aLocalName) {
+ nsAttrKey attr(aNamespaceID, aLocalName);
+ if (auto entry = mAttributeCache.Lookup(attr)) {
+ entry.Data()->SetMap(nullptr); // break link to map
+ entry.Remove();
+ }
+}
+
+Attr* nsDOMAttributeMap::GetAttribute(mozilla::dom::NodeInfo* aNodeInfo) {
+ NS_ASSERTION(aNodeInfo, "GetAttribute() called with aNodeInfo == nullptr!");
+
+ nsAttrKey attr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom());
+
+ return mAttributeCache.LookupOrInsertWith(attr, [&] {
+ // Newly inserted entry!
+ RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
+ auto* nim = ni->NodeInfoManager();
+ return new (nim) Attr(this, ni.forget(), u""_ns);
+ });
+}
+
+Attr* nsDOMAttributeMap::NamedGetter(const nsAString& aAttrName, bool& aFound) {
+ aFound = false;
+ NS_ENSURE_TRUE(mContent, nullptr);
+
+ RefPtr<mozilla::dom::NodeInfo> ni =
+ mContent->GetExistingAttrNameFromQName(aAttrName);
+ if (!ni) {
+ return nullptr;
+ }
+
+ aFound = true;
+ return GetAttribute(ni);
+}
+
+void nsDOMAttributeMap::GetSupportedNames(nsTArray<nsString>& aNames) {
+ // For HTML elements in HTML documents, only include names that are still the
+ // same after ASCII-lowercasing, since our named getter will end up
+ // ASCII-lowercasing the given string.
+ bool lowercaseNamesOnly =
+ mContent->IsHTMLElement() && mContent->IsInHTMLDocument();
+
+ const uint32_t count = mContent->GetAttrCount();
+ bool seenNonAtomName = false;
+ for (uint32_t i = 0; i < count; i++) {
+ const nsAttrName* name = mContent->GetAttrNameAt(i);
+ seenNonAtomName = seenNonAtomName || !name->IsAtom();
+ nsString qualifiedName;
+ name->GetQualifiedName(qualifiedName);
+
+ if (lowercaseNamesOnly &&
+ nsContentUtils::StringContainsASCIIUpper(qualifiedName)) {
+ continue;
+ }
+
+ // Omit duplicates. We only need to do this check if we've seen a non-atom
+ // name, because that's the only way we can have two identical qualified
+ // names.
+ if (seenNonAtomName && aNames.Contains(qualifiedName)) {
+ continue;
+ }
+
+ aNames.AppendElement(qualifiedName);
+ }
+}
+
+Attr* nsDOMAttributeMap::GetNamedItem(const nsAString& aAttrName) {
+ bool dummy;
+ return NamedGetter(aAttrName, dummy);
+}
+
+already_AddRefed<Attr> nsDOMAttributeMap::SetNamedItemNS(Attr& aAttr,
+ ErrorResult& aError) {
+ NS_ENSURE_TRUE(mContent, nullptr);
+
+ // XXX should check same-origin between mContent and aAttr however
+ // nsContentUtils::CheckSameOrigin can't deal with attributenodes yet
+
+ // Check that attribute is not owned by somebody else
+ nsDOMAttributeMap* owner = aAttr.GetMap();
+ if (owner) {
+ if (owner != this) {
+ aError.Throw(NS_ERROR_DOM_INUSE_ATTRIBUTE_ERR);
+ return nullptr;
+ }
+
+ // setting a preexisting attribute is a no-op, just return the same
+ // node.
+ RefPtr<Attr> attribute = &aAttr;
+ return attribute.forget();
+ }
+
+ nsresult rv;
+ if (mContent->OwnerDoc() != aAttr.OwnerDoc()) {
+ DebugOnly<void*> adoptedNode =
+ mContent->OwnerDoc()->AdoptNode(aAttr, aError);
+ if (aError.Failed()) {
+ return nullptr;
+ }
+
+ NS_ASSERTION(adoptedNode == &aAttr, "Uh, adopt node changed nodes?");
+ }
+
+ // Get nodeinfo and preexisting attribute (if it exists)
+ RefPtr<NodeInfo> oldNi;
+
+ uint32_t i, count = mContent->GetAttrCount();
+ for (i = 0; i < count; ++i) {
+ const nsAttrName* name = mContent->GetAttrNameAt(i);
+ int32_t attrNS = name->NamespaceID();
+ nsAtom* nameAtom = name->LocalName();
+
+ // we're purposefully ignoring the prefix.
+ if (aAttr.NodeInfo()->Equals(nameAtom, attrNS)) {
+ oldNi = mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
+ nameAtom, name->GetPrefix(), aAttr.NodeInfo()->NamespaceID(),
+ nsINode::ATTRIBUTE_NODE);
+ break;
+ }
+ }
+
+ RefPtr<Attr> oldAttr;
+
+ if (oldNi) {
+ oldAttr = GetAttribute(oldNi);
+
+ if (oldAttr == &aAttr) {
+ return oldAttr.forget();
+ }
+
+ if (oldAttr) {
+ // Just remove it from our hashtable. This has no side-effects, so we
+ // don't have to recheck anything after we do it. Then we'll add our new
+ // Attr to the hashtable and do the actual attr set on the element. This
+ // will make the whole thing look like a single attribute mutation (with
+ // the new attr node in place) as opposed to a removal and addition.
+ DropAttribute(oldNi->NamespaceID(), oldNi->NameAtom());
+ }
+ }
+
+ nsAutoString value;
+ aAttr.GetValue(value);
+
+ RefPtr<NodeInfo> ni = aAttr.NodeInfo();
+
+ // Add the new attribute to the attribute map before updating
+ // its value in the element. @see bug 364413.
+ nsAttrKey attrkey(ni->NamespaceID(), ni->NameAtom());
+ mAttributeCache.InsertOrUpdate(attrkey, RefPtr{&aAttr});
+ aAttr.SetMap(this);
+
+ rv = mContent->SetAttr(ni->NamespaceID(), ni->NameAtom(), ni->GetPrefixAtom(),
+ value, true);
+ if (NS_FAILED(rv)) {
+ DropAttribute(ni->NamespaceID(), ni->NameAtom());
+ aError.Throw(rv);
+ return nullptr;
+ }
+
+ return oldAttr.forget();
+}
+
+already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItem(NodeInfo* aNodeInfo,
+ ErrorResult& aError) {
+ RefPtr<Attr> attribute = GetAttribute(aNodeInfo);
+ // This removes the attribute node from the attribute map.
+ aError = mContent->UnsetAttr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom(),
+ true);
+ return attribute.forget();
+}
+
+already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItem(
+ const nsAString& aName, ErrorResult& aError) {
+ if (!mContent) {
+ aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
+ return nullptr;
+ }
+
+ RefPtr<mozilla::dom::NodeInfo> ni =
+ mContent->GetExistingAttrNameFromQName(aName);
+ if (!ni) {
+ aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
+ return nullptr;
+ }
+
+ return RemoveNamedItem(ni, aError);
+}
+
+Attr* nsDOMAttributeMap::IndexedGetter(uint32_t aIndex, bool& aFound) {
+ aFound = false;
+ NS_ENSURE_TRUE(mContent, nullptr);
+
+ const nsAttrName* name = mContent->GetAttrNameAt(aIndex);
+ NS_ENSURE_TRUE(name, nullptr);
+
+ aFound = true;
+ // Don't use the nodeinfo even if one exists since it can have the wrong
+ // owner document.
+ RefPtr<mozilla::dom::NodeInfo> ni =
+ mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
+ name->LocalName(), name->GetPrefix(), name->NamespaceID(),
+ nsINode::ATTRIBUTE_NODE);
+ return GetAttribute(ni);
+}
+
+Attr* nsDOMAttributeMap::Item(uint32_t aIndex) {
+ bool dummy;
+ return IndexedGetter(aIndex, dummy);
+}
+
+uint32_t nsDOMAttributeMap::Length() const {
+ NS_ENSURE_TRUE(mContent, 0);
+
+ return mContent->GetAttrCount();
+}
+
+Attr* nsDOMAttributeMap::GetNamedItemNS(const nsAString& aNamespaceURI,
+ const nsAString& aLocalName) {
+ RefPtr<mozilla::dom::NodeInfo> ni =
+ GetAttrNodeInfo(aNamespaceURI, aLocalName);
+ if (!ni) {
+ return nullptr;
+ }
+
+ return GetAttribute(ni);
+}
+
+already_AddRefed<mozilla::dom::NodeInfo> nsDOMAttributeMap::GetAttrNodeInfo(
+ const nsAString& aNamespaceURI, const nsAString& aLocalName) {
+ if (!mContent) {
+ return nullptr;
+ }
+
+ int32_t nameSpaceID = kNameSpaceID_None;
+
+ if (!aNamespaceURI.IsEmpty()) {
+ nameSpaceID = nsNameSpaceManager::GetInstance()->GetNameSpaceID(
+ aNamespaceURI, nsContentUtils::IsChromeDoc(mContent->OwnerDoc()));
+
+ if (nameSpaceID == kNameSpaceID_Unknown) {
+ return nullptr;
+ }
+ }
+
+ uint32_t i, count = mContent->GetAttrCount();
+ for (i = 0; i < count; ++i) {
+ const nsAttrName* name = mContent->GetAttrNameAt(i);
+ int32_t attrNS = name->NamespaceID();
+ nsAtom* nameAtom = name->LocalName();
+
+ // we're purposefully ignoring the prefix.
+ if (nameSpaceID == attrNS && nameAtom->Equals(aLocalName)) {
+ RefPtr<mozilla::dom::NodeInfo> ni;
+ ni = mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
+ nameAtom, name->GetPrefix(), nameSpaceID, nsINode::ATTRIBUTE_NODE);
+
+ return ni.forget();
+ }
+ }
+
+ return nullptr;
+}
+
+already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItemNS(
+ const nsAString& aNamespaceURI, const nsAString& aLocalName,
+ ErrorResult& aError) {
+ RefPtr<mozilla::dom::NodeInfo> ni =
+ GetAttrNodeInfo(aNamespaceURI, aLocalName);
+ if (!ni) {
+ aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
+ return nullptr;
+ }
+
+ return RemoveNamedItem(ni, aError);
+}
+
+uint32_t nsDOMAttributeMap::Count() const { return mAttributeCache.Count(); }
+
+size_t nsDOMAttributeMap::SizeOfIncludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ size_t n = aMallocSizeOf(this);
+
+ n += mAttributeCache.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ for (const auto& entry : mAttributeCache) {
+ n += aMallocSizeOf(entry.GetWeak());
+ }
+
+ // NB: mContent is non-owning and thus not counted.
+ return n;
+}
+
+/* virtual */
+JSObject* nsDOMAttributeMap::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return NamedNodeMap_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+DocGroup* nsDOMAttributeMap::GetDocGroup() const {
+ return mContent ? mContent->OwnerDoc()->GetDocGroup() : nullptr;
+}