The Tor Browser / file comparison

comparison: content/base/src/Attr.cpp

content/base/src/Attr.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /*
7 * Implementation of DOM Core's nsIDOMAttr node.
8 */
9
10 #include "mozilla/dom/Attr.h"
11 #include "mozilla/dom/AttrBinding.h"
12 #include "mozilla/dom/Element.h"
13 #include "mozilla/EventDispatcher.h"
14 #include "mozilla/InternalMutationEvent.h"
15 #include "nsContentCreatorFunctions.h"
16 #include "nsError.h"
17 #include "nsUnicharUtils.h"
18 #include "nsDOMString.h"
19 #include "nsIContentInlines.h"
20 #include "nsIDocument.h"
21 #include "nsIDOMUserDataHandler.h"
22 #include "nsGkAtoms.h"
23 #include "nsCOMArray.h"
24 #include "nsNameSpaceManager.h"
25 #include "nsNodeUtils.h"
26 #include "nsTextNode.h"
27 #include "mozAutoDocUpdate.h"
28 #include "nsWrapperCacheInlines.h"
29
30 nsIAttribute::nsIAttribute(nsDOMAttributeMap* aAttrMap,
31 already_AddRefed<nsINodeInfo>& aNodeInfo,
32 bool aNsAware)
33 : nsINode(aNodeInfo), mAttrMap(aAttrMap), mNsAware(aNsAware)
34 {
35 }
36
37 nsIAttribute::~nsIAttribute()
38 {
39 }
40
41 namespace mozilla {
42 namespace dom {
43
44 //----------------------------------------------------------------------
45 bool Attr::sInitialized;
46
47 Attr::Attr(nsDOMAttributeMap *aAttrMap,
48 already_AddRefed<nsINodeInfo>&& aNodeInfo,
49 const nsAString &aValue, bool aNsAware)
50 : nsIAttribute(aAttrMap, aNodeInfo, aNsAware), mValue(aValue)
51 {
52 NS_ABORT_IF_FALSE(mNodeInfo, "We must get a nodeinfo here!");
53 NS_ABORT_IF_FALSE(mNodeInfo->NodeType() == nsIDOMNode::ATTRIBUTE_NODE,
54 "Wrong nodeType");
55
56 // We don't add a reference to our content. It will tell us
57 // to drop our reference when it goes away.
58
59 SetIsDOMBinding();
60 }
61
62 NS_IMPL_CYCLE_COLLECTION_CLASS(Attr)
63
64 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Attr)
65 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
66
67 if (!nsINode::Traverse(tmp, cb)) {
68 return NS_SUCCESS_INTERRUPTED_TRAVERSE;
69 }
70 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAttrMap)
71 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
72
73 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Attr)
74
75 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Attr)
76 nsINode::Unlink(tmp);
77 NS_IMPL_CYCLE_COLLECTION_UNLINK(mAttrMap)
78 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
79
80 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(Attr)
81 Element* ownerElement = tmp->GetElement();
82 if (tmp->IsBlack()) {
83 if (ownerElement) {
84 // The attribute owns the element via attribute map so we can
85 // mark it when the attribute is certainly alive.
86 mozilla::dom::FragmentOrElement::MarkNodeChildren(ownerElement);
87 }
88 return true;
89 }
90 if (ownerElement &&
91 mozilla::dom::FragmentOrElement::CanSkip(ownerElement, true)) {
92 return true;
93 }
94 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
95
96 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(Attr)
97 return tmp->IsBlackAndDoesNotNeedTracing(static_cast<nsIAttribute*>(tmp));
98 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
99
100 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(Attr)
101 return tmp->IsBlack();
102 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
103
104 // QueryInterface implementation for Attr
105 NS_INTERFACE_TABLE_HEAD(Attr)
106 NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
107 NS_INTERFACE_TABLE(Attr, nsINode, nsIDOMAttr, nsIAttribute, nsIDOMNode,
108 nsIDOMEventTarget, EventTarget)
109 NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(Attr)
110 NS_INTERFACE_MAP_ENTRY_TEAROFF(nsISupportsWeakReference,
111 new nsNodeSupportsWeakRefTearoff(this))
112 NS_INTERFACE_MAP_ENTRY_TEAROFF(nsIDOMXPathNSResolver,
113 new nsNode3Tearoff(this))
114 NS_INTERFACE_MAP_END
115
116 NS_IMPL_CYCLE_COLLECTING_ADDREF(Attr)
117 NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(Attr,
118 nsNodeUtils::LastRelease(this))
119
120 void
121 Attr::SetMap(nsDOMAttributeMap *aMap)
122 {
123 if (mAttrMap && !aMap && sInitialized) {
124 // We're breaking a relationship with content and not getting a new one,
125 // need to locally cache value. GetValue() does that.
126 GetValue(mValue);
127 }
128
129 mAttrMap = aMap;
130 }
131
132 Element*
133 Attr::GetElement() const
134 {
135 if (!mAttrMap) {
136 return nullptr;
137 }
138 nsIContent* content = mAttrMap->GetContent();
139 return content ? content->AsElement() : nullptr;
140 }
141
142 nsresult
143 Attr::SetOwnerDocument(nsIDocument* aDocument)
144 {
145 NS_ASSERTION(aDocument, "Missing document");
146
147 nsIDocument *doc = OwnerDoc();
148 NS_ASSERTION(doc != aDocument, "bad call to Attr::SetOwnerDocument");
149 doc->DeleteAllPropertiesFor(this);
150
151 nsCOMPtr<nsINodeInfo> newNodeInfo;
152 newNodeInfo = aDocument->NodeInfoManager()->
153 GetNodeInfo(mNodeInfo->NameAtom(), mNodeInfo->GetPrefixAtom(),
154 mNodeInfo->NamespaceID(),
155 nsIDOMNode::ATTRIBUTE_NODE);
156 NS_ASSERTION(newNodeInfo, "GetNodeInfo lies");
157 mNodeInfo.swap(newNodeInfo);
158
159 return NS_OK;
160 }
161
162 NS_IMETHODIMP
163 Attr::GetName(nsAString& aName)
164 {
165 aName = NodeName();
166 return NS_OK;
167 }
168
169 already_AddRefed<nsIAtom>
170 Attr::GetNameAtom(nsIContent* aContent)
171 {
172 if (!mNsAware &&
173 mNodeInfo->NamespaceID() == kNameSpaceID_None &&
174 aContent->IsInHTMLDocument() &&
175 aContent->IsHTML()) {
176 nsString name;
177 mNodeInfo->GetName(name);
178 nsAutoString lowercaseName;
179 nsContentUtils::ASCIIToLower(name, lowercaseName);
180 return do_GetAtom(lowercaseName);
181 }
182 nsCOMPtr<nsIAtom> nameAtom = mNodeInfo->NameAtom();
183 return nameAtom.forget();
184 }
185
186 NS_IMETHODIMP
187 Attr::GetValue(nsAString& aValue)
188 {
189 Element* element = GetElement();
190 if (element) {
191 nsCOMPtr<nsIAtom> nameAtom = GetNameAtom(element);
192 element->GetAttr(mNodeInfo->NamespaceID(), nameAtom, aValue);
193 }
194 else {
195 aValue = mValue;
196 }
197
198 return NS_OK;
199 }
200
201 void
202 Attr::SetValue(const nsAString& aValue, ErrorResult& aRv)
203 {
204 Element* element = GetElement();
205 if (!element) {
206 mValue = aValue;
207 return;
208 }
209
210 nsCOMPtr<nsIAtom> nameAtom = GetNameAtom(element);
211 aRv = element->SetAttr(mNodeInfo->NamespaceID(),
212 nameAtom,
213 mNodeInfo->GetPrefixAtom(),
214 aValue,
215 true);
216 }
217
218 NS_IMETHODIMP
219 Attr::SetValue(const nsAString& aValue)
220 {
221 ErrorResult rv;
222 SetValue(aValue, rv);
223 return rv.ErrorCode();
224 }
225
226 bool
227 Attr::Specified() const
228 {
229 return true;
230 }
231
232 NS_IMETHODIMP
233 Attr::GetSpecified(bool* aSpecified)
234 {
235 NS_ENSURE_ARG_POINTER(aSpecified);
236 *aSpecified = Specified();
237 return NS_OK;
238 }
239
240 Element*
241 Attr::GetOwnerElement(ErrorResult& aRv)
242 {
243 OwnerDoc()->WarnOnceAbout(nsIDocument::eOwnerElement);
244 return GetElement();
245 }
246
247 NS_IMETHODIMP
248 Attr::GetOwnerElement(nsIDOMElement** aOwnerElement)
249 {
250 NS_ENSURE_ARG_POINTER(aOwnerElement);
251 OwnerDoc()->WarnOnceAbout(nsIDocument::eOwnerElement);
252
253 Element* element = GetElement();
254 if (element) {
255 return CallQueryInterface(element, aOwnerElement);
256 }
257
258 *aOwnerElement = nullptr;
259
260 return NS_OK;
261 }
262
263 void
264 Attr::GetNodeValueInternal(nsAString& aNodeValue)
265 {
266 OwnerDoc()->WarnOnceAbout(nsIDocument::eNodeValue);
267
268 GetValue(aNodeValue);
269 }
270
271 void
272 Attr::SetNodeValueInternal(const nsAString& aNodeValue, ErrorResult& aError)
273 {
274 OwnerDoc()->WarnOnceAbout(nsIDocument::eNodeValue);
275
276 aError = SetValue(aNodeValue);
277 }
278
279 nsresult
280 Attr::Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const
281 {
282 nsAutoString value;
283 const_cast<Attr*>(this)->GetValue(value);
284
285 nsCOMPtr<nsINodeInfo> ni = aNodeInfo;
286 *aResult = new Attr(nullptr, ni.forget(), value, mNsAware);
287 if (!*aResult) {
288 return NS_ERROR_OUT_OF_MEMORY;
289 }
290
291 NS_ADDREF(*aResult);
292
293 return NS_OK;
294 }
295
296 already_AddRefed<nsIURI>
297 Attr::GetBaseURI(bool aTryUseXHRDocBaseURI) const
298 {
299 Element* parent = GetElement();
300
301 return parent ? parent->GetBaseURI(aTryUseXHRDocBaseURI) : nullptr;
302 }
303
304 void
305 Attr::GetTextContentInternal(nsAString& aTextContent)
306 {
307 OwnerDoc()->WarnOnceAbout(nsIDocument::eTextContent);
308
309 GetValue(aTextContent);
310 }
311
312 void
313 Attr::SetTextContentInternal(const nsAString& aTextContent,
314 ErrorResult& aError)
315 {
316 OwnerDoc()->WarnOnceAbout(nsIDocument::eTextContent);
317
318 SetNodeValueInternal(aTextContent, aError);
319 }
320
321 NS_IMETHODIMP
322 Attr::GetIsId(bool* aReturn)
323 {
324 Element* element = GetElement();
325 if (!element) {
326 *aReturn = false;
327 return NS_OK;
328 }
329
330 nsIAtom* idAtom = element->GetIDAttributeName();
331 if (!idAtom) {
332 *aReturn = false;
333 return NS_OK;
334 }
335
336 *aReturn = mNodeInfo->Equals(idAtom, kNameSpaceID_None);
337 return NS_OK;
338 }
339
340 bool
341 Attr::IsNodeOfType(uint32_t aFlags) const
342 {
343 return !(aFlags & ~eATTRIBUTE);
344 }
345
346 uint32_t
347 Attr::GetChildCount() const
348 {
349 return 0;
350 }
351
352 nsIContent *
353 Attr::GetChildAt(uint32_t aIndex) const
354 {
355 return nullptr;
356 }
357
358 nsIContent * const *
359 Attr::GetChildArray(uint32_t* aChildCount) const
360 {
361 *aChildCount = 0;
362 return nullptr;
363 }
364
365 int32_t
366 Attr::IndexOf(const nsINode* aPossibleChild) const
367 {
368 return -1;
369 }
370
371 nsresult
372 Attr::InsertChildAt(nsIContent* aKid, uint32_t aIndex,
373 bool aNotify)
374 {
375 return NS_ERROR_NOT_IMPLEMENTED;
376 }
377
378 void
379 Attr::RemoveChildAt(uint32_t aIndex, bool aNotify)
380 {
381 }
382
383 nsresult
384 Attr::PreHandleEvent(EventChainPreVisitor& aVisitor)
385 {
386 aVisitor.mCanHandle = true;
387 return NS_OK;
388 }
389
390 void
391 Attr::Initialize()
392 {
393 sInitialized = true;
394 }
395
396 void
397 Attr::Shutdown()
398 {
399 sInitialized = false;
400 }
401
402 JSObject*
403 Attr::WrapObject(JSContext* aCx)
404 {
405 return AttrBinding::Wrap(aCx, this);
406 }
407
408 } // namespace dom
409 } // namespace mozilla

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