dom/base/Attr.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /*
   8  * Implementation of DOM Core's Attr node.
   9  */
  10
  11 #include "mozilla/dom/Attr.h"
  12 #include "mozilla/dom/AttrBinding.h"
  13 #include "mozilla/dom/Element.h"
  14 #include "mozilla/EventDispatcher.h"
  15 #include "mozilla/InternalMutationEvent.h"
  16 #include "mozilla/StaticPrefs_dom.h"
  17 #include "nsContentCreatorFunctions.h"
  18 #include "nsError.h"
  19 #include "nsUnicharUtils.h"
  20 #include "nsDOMString.h"
  21 #include "nsIContentInlines.h"
  22 #include "mozilla/dom/Document.h"
  23 #include "nsGkAtoms.h"
  24 #include "nsCOMArray.h"
  25 #include "nsNameSpaceManager.h"
  26 #include "nsTextNode.h"
  27 #include "mozAutoDocUpdate.h"
  28 #include "nsWrapperCacheInlines.h"
  29 #include "NodeUbiReporting.h"
  30
  31 namespace mozilla::dom {
  32
  33 //----------------------------------------------------------------------
  34 bool Attr::sInitialized;
  35
  36 Attr::Attr(nsDOMAttributeMap* aAttrMap,
  37            already_AddRefed<dom::NodeInfo>&& aNodeInfo, const nsAString& aValue)
  38     : nsINode(std::move(aNodeInfo)), mAttrMap(aAttrMap), mValue(aValue) {
  39   MOZ_ASSERT(mNodeInfo, "We must get a nodeinfo here!");
  40   MOZ_ASSERT(mNodeInfo->NodeType() == ATTRIBUTE_NODE, "Wrong nodeType");
  41
  42   // We don't add a reference to our content. It will tell us
  43   // to drop our reference when it goes away.
  44 }
  45
  46 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Attr)
  47
  48 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Attr)
  49   if (!nsINode::Traverse(tmp, cb)) {
  50     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
  51   }
  52   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAttrMap)
  53 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  54
  55 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Attr)
  56   nsINode::Unlink(tmp);
  57   NS_IMPL_CYCLE_COLLECTION_UNLINK(mAttrMap)
  58 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  59
  60 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(Attr)
  61   Element* ownerElement = tmp->GetElement();
  62   if (tmp->HasKnownLiveWrapper()) {
  63     if (ownerElement) {
  64       // The attribute owns the element via attribute map so we can
  65       // mark it when the attribute is certainly alive.
  66       mozilla::dom::FragmentOrElement::MarkNodeChildren(ownerElement);
  67     }
  68     return true;
  69   }
  70   if (ownerElement &&
  71       mozilla::dom::FragmentOrElement::CanSkip(ownerElement, true)) {
  72     return true;
  73   }
  74 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
  75
  76 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(Attr)
  77   return tmp->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
  78 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
  79
  80 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(Attr)
  81   return tmp->HasKnownLiveWrapper();
  82 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
  83
  84 // QueryInterface implementation for Attr
  85 NS_INTERFACE_TABLE_HEAD(Attr)
  86   NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
  87   NS_INTERFACE_TABLE(Attr, nsINode, EventTarget)
  88   NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(Attr)
  89   NS_INTERFACE_MAP_ENTRY_TEAROFF(nsISupportsWeakReference,
  90                                  new nsNodeSupportsWeakRefTearoff(this))
  91 NS_INTERFACE_MAP_END
  92
  93 NS_IMPL_CYCLE_COLLECTING_ADDREF(Attr)
  94
  95 NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE_AND_DESTROY(Attr,
  96                                                                LastRelease(),
  97                                                                Destroy())
  98
  99 NS_IMPL_DOMARENA_DESTROY(Attr)
 100
 101 void Attr::SetMap(nsDOMAttributeMap* aMap) {
 102   if (mAttrMap && !aMap && sInitialized) {
 103     // We're breaking a relationship with content and not getting a new one,
 104     // need to locally cache value. GetValue() does that.
 105     GetValue(mValue);
 106   }
 107
 108   mAttrMap = aMap;
 109 }
 110
 111 Element* Attr::GetElement() const {
 112   if (!mAttrMap) {
 113     return nullptr;
 114   }
 115   nsIContent* content = mAttrMap->GetContent();
 116   return content ? content->AsElement() : nullptr;
 117 }
 118
 119 nsresult Attr::SetOwnerDocument(Document* aDocument) {
 120   NS_ASSERTION(aDocument, "Missing document");
 121
 122   Document* doc = OwnerDoc();
 123   NS_ASSERTION(doc != aDocument, "bad call to Attr::SetOwnerDocument");
 124   doc->RemoveAllPropertiesFor(this);
 125
 126   RefPtr<dom::NodeInfo> newNodeInfo = aDocument->NodeInfoManager()->GetNodeInfo(
 127       mNodeInfo->NameAtom(), mNodeInfo->GetPrefixAtom(),
 128       mNodeInfo->NamespaceID(), ATTRIBUTE_NODE);
 129   NS_ASSERTION(newNodeInfo, "GetNodeInfo lies");
 130   mNodeInfo.swap(newNodeInfo);
 131
 132   return NS_OK;
 133 }
 134
 135 void Attr::GetName(nsAString& aName) { aName = NodeName(); }
 136
 137 void Attr::GetValue(nsAString& aValue) {
 138   Element* element = GetElement();
 139   if (element) {
 140     RefPtr<nsAtom> nameAtom = mNodeInfo->NameAtom();
 141     element->GetAttr(mNodeInfo->NamespaceID(), nameAtom, aValue);
 142   } else {
 143     aValue = mValue;
 144   }
 145 }
 146
 147 void Attr::SetValue(const nsAString& aValue, nsIPrincipal* aTriggeringPrincipal,
 148                     ErrorResult& aRv) {
 149   Element* element = GetElement();
 150   if (!element) {
 151     mValue = aValue;
 152     return;
 153   }
 154
 155   RefPtr<nsAtom> nameAtom = mNodeInfo->NameAtom();
 156   aRv = element->SetAttr(mNodeInfo->NamespaceID(), nameAtom,
 157                          mNodeInfo->GetPrefixAtom(), aValue,
 158                          aTriggeringPrincipal, true);
 159 }
 160
 161 void Attr::SetValue(const nsAString& aValue, ErrorResult& aRv) {
 162   SetValue(aValue, nullptr, aRv);
 163 }
 164
 165 bool Attr::Specified() const { return true; }
 166
 167 Element* Attr::GetOwnerElement() { return GetElement(); }
 168
 169 void Attr::GetNodeValueInternal(nsAString& aNodeValue) { GetValue(aNodeValue); }
 170
 171 void Attr::SetNodeValueInternal(const nsAString& aNodeValue,
 172                                 ErrorResult& aError) {
 173   SetValue(aNodeValue, nullptr, aError);
 174 }
 175
 176 nsresult Attr::Clone(dom::NodeInfo* aNodeInfo, nsINode** aResult) const {
 177   nsAutoString value;
 178   const_cast<Attr*>(this)->GetValue(value);
 179   *aResult = new (aNodeInfo->NodeInfoManager())
 180       Attr(nullptr, do_AddRef(aNodeInfo), value);
 181
 182   NS_ADDREF(*aResult);
 183
 184   return NS_OK;
 185 }
 186
 187 nsIURI* Attr::GetBaseURI(bool aTryUseXHRDocBaseURI) const {
 188   Element* parent = GetElement();
 189
 190   return parent ? parent->GetBaseURI(aTryUseXHRDocBaseURI)
 191                 : OwnerDoc()->GetBaseURI(aTryUseXHRDocBaseURI);
 192 }
 193
 194 void Attr::GetTextContentInternal(nsAString& aTextContent,
 195                                   OOMReporter& aError) {
 196   GetValue(aTextContent);
 197 }
 198
 199 void Attr::SetTextContentInternal(const nsAString& aTextContent,
 200                                   nsIPrincipal* aSubjectPrincipal,
 201                                   ErrorResult& aError) {
 202   SetNodeValueInternal(aTextContent, aError);
 203 }
 204
 205 void Attr::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
 206   aVisitor.mCanHandle = true;
 207 }
 208
 209 void Attr::Initialize() { sInitialized = true; }
 210
 211 void Attr::Shutdown() { sInitialized = false; }
 212
 213 JSObject* Attr::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
 214   return Attr_Binding::Wrap(aCx, this, aGivenProto);
 215 }
 216
 217 void Attr::ConstructUbiNode(void* storage) {
 218   JS::ubi::Concrete<Attr>::construct(storage, this);
 219 }
 220
 221 }  // namespace mozilla::dom