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 * Class that represents a prefix/namespace/localName triple; a single
9 * nodeinfo is shared by all elements in a document that have that
10 * prefix, namespace, and localName.
11 */
12
13 #include "mozilla/dom/NodeInfo.h"
14 #include "mozilla/dom/NodeInfoInlines.h"
15
16 #include "mozilla/ArrayUtils.h"
17 #include "mozilla/Likely.h"
18
19 #include "nsNodeInfoManager.h"
20 #include "nsCOMPtr.h"
21 #include "nsString.h"
22 #include "nsAtom.h"
23 #include "nsDOMString.h"
24 #include "nsCRT.h"
25 #include "nsINode.h"
26 #include "nsContentUtils.h"
27 #include "nsReadableUtils.h"
28 #include "mozilla/Sprintf.h"
29 #include "mozilla/dom/Document.h"
30 #include "nsGkAtoms.h"
31 #include "nsCCUncollectableMarker.h"
32 #include "nsNameSpaceManager.h"
33
34 using namespace mozilla;
35 using mozilla::dom::NodeInfo;
36
~NodeInfo()37 NodeInfo::~NodeInfo() {
38 mOwnerManager->RemoveNodeInfo(this);
39
40 // We can't use NS_IF_RELEASE because mName is const.
41 if (mInner.mName) {
42 mInner.mName->Release();
43 }
44 NS_IF_RELEASE(mInner.mPrefix);
45 NS_IF_RELEASE(mInner.mExtraName);
46 }
47
NodeInfo(nsAtom * aName,nsAtom * aPrefix,int32_t aNamespaceID,uint16_t aNodeType,nsAtom * aExtraName,nsNodeInfoManager * aOwnerManager)48 NodeInfo::NodeInfo(nsAtom* aName, nsAtom* aPrefix, int32_t aNamespaceID,
49 uint16_t aNodeType, nsAtom* aExtraName,
50 nsNodeInfoManager* aOwnerManager)
51 : mDocument(aOwnerManager->GetDocument()),
52 mInner(aName, aPrefix, aNamespaceID, aNodeType, aExtraName),
53 mOwnerManager(aOwnerManager) {
54 CheckValidNodeInfo(aNodeType, aName, aNamespaceID, aExtraName);
55
56 NS_IF_ADDREF(mInner.mName);
57 NS_IF_ADDREF(mInner.mPrefix);
58 NS_IF_ADDREF(mInner.mExtraName);
59
60 // Now compute our cached members.
61
62 // Qualified name. If we have no prefix, use ToString on
63 // mInner.mName so that we get to share its buffer.
64 if (aPrefix) {
65 mQualifiedName = nsDependentAtomString(mInner.mPrefix) + u":"_ns +
66 nsDependentAtomString(mInner.mName);
67 } else {
68 mInner.mName->ToString(mQualifiedName);
69 }
70
71 MOZ_ASSERT_IF(aNodeType != nsINode::ELEMENT_NODE &&
72 aNodeType != nsINode::ATTRIBUTE_NODE &&
73 aNodeType != UINT16_MAX,
74 aNamespaceID == kNameSpaceID_None && !aPrefix);
75
76 switch (aNodeType) {
77 case nsINode::ELEMENT_NODE:
78 case nsINode::ATTRIBUTE_NODE:
79 // Correct the case for HTML
80 if (aNodeType == nsINode::ELEMENT_NODE &&
81 aNamespaceID == kNameSpaceID_XHTML && GetDocument() &&
82 GetDocument()->IsHTMLDocument()) {
83 nsContentUtils::ASCIIToUpper(mQualifiedName, mNodeName);
84 } else {
85 mNodeName = mQualifiedName;
86 }
87 mInner.mName->ToString(mLocalName);
88 break;
89 case nsINode::TEXT_NODE:
90 case nsINode::CDATA_SECTION_NODE:
91 case nsINode::COMMENT_NODE:
92 case nsINode::DOCUMENT_NODE:
93 case nsINode::DOCUMENT_FRAGMENT_NODE:
94 mInner.mName->ToString(mNodeName);
95 SetDOMStringToNull(mLocalName);
96 break;
97 case nsINode::PROCESSING_INSTRUCTION_NODE:
98 case nsINode::DOCUMENT_TYPE_NODE:
99 mInner.mExtraName->ToString(mNodeName);
100 SetDOMStringToNull(mLocalName);
101 break;
102 default:
103 MOZ_ASSERT(aNodeType == UINT16_MAX, "Unknown node type");
104 }
105 }
106
107 // nsISupports
108
109 NS_IMPL_CYCLE_COLLECTION_CLASS(NodeInfo)
110
111 NS_IMPL_CYCLE_COLLECTION_UNLINK_0(NodeInfo)
112
113 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(NodeInfo)
114 if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
115 char name[72];
116 uint32_t nsid = tmp->NamespaceID();
117 nsAtomCString localName(tmp->NameAtom());
118 const char* nsuri = nsNameSpaceManager::GetNameSpaceDisplayName(nsid);
119 SprintfLiteral(name, "NodeInfo %s %s", nsuri, localName.get());
120
121 cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name);
122 } else {
123 NS_IMPL_CYCLE_COLLECTION_DESCRIBE(NodeInfo, tmp->mRefCnt.get())
124 }
125
126 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwnerManager)
127 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
128
129 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(NodeInfo)
130 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
131 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
132
133 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(NodeInfo)
134 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
135 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
136
137 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(NodeInfo)
138 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
139 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
140
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(NodeInfo,AddRef)141 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(NodeInfo, AddRef)
142 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(NodeInfo, Release)
143
144 void NodeInfo::GetName(nsAString& aName) const {
145 mInner.mName->ToString(aName);
146 }
147
GetPrefix(nsAString & aPrefix) const148 void NodeInfo::GetPrefix(nsAString& aPrefix) const {
149 if (mInner.mPrefix) {
150 mInner.mPrefix->ToString(aPrefix);
151 } else {
152 SetDOMStringToNull(aPrefix);
153 }
154 }
155
GetNamespaceURI(nsAString & aNameSpaceURI) const156 void NodeInfo::GetNamespaceURI(nsAString& aNameSpaceURI) const {
157 if (mInner.mNamespaceID > 0) {
158 nsresult rv = nsContentUtils::NameSpaceManager()->GetNameSpaceURI(
159 mInner.mNamespaceID, aNameSpaceURI);
160 // How can we possibly end up with a bogus namespace ID here?
161 if (NS_FAILED(rv)) {
162 MOZ_CRASH();
163 }
164 } else {
165 SetDOMStringToNull(aNameSpaceURI);
166 }
167 }
168
NamespaceEquals(const nsAString & aNamespaceURI) const169 bool NodeInfo::NamespaceEquals(const nsAString& aNamespaceURI) const {
170 int32_t nsid = nsContentUtils::NameSpaceManager()->GetNameSpaceID(
171 aNamespaceURI, nsContentUtils::IsChromeDoc(mOwnerManager->GetDocument()));
172
173 return mozilla::dom::NodeInfo::NamespaceEquals(nsid);
174 }
175
DeleteCycleCollectable()176 void NodeInfo::DeleteCycleCollectable() {
177 RefPtr<nsNodeInfoManager> kungFuDeathGrip = mOwnerManager;
178 mozilla::Unused
179 << kungFuDeathGrip; // Just keeping value alive for longer than this
180 delete this;
181 }
182
CanSkip()183 bool NodeInfo::CanSkip() {
184 return mDocument && nsCCUncollectableMarker::InGeneration(
185 mDocument->GetMarkedCCGeneration());
186 }
187