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 "nsIDocument.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) +
66 NS_LITERAL_STRING(":") +
67 nsDependentAtomString(mInner.mName);
68 } else {
69 mInner.mName->ToString(mQualifiedName);
70 }
71
72 MOZ_ASSERT_IF(aNodeType != nsINode::ELEMENT_NODE &&
73 aNodeType != nsINode::ATTRIBUTE_NODE &&
74 aNodeType != UINT16_MAX,
75 aNamespaceID == kNameSpaceID_None && !aPrefix);
76
77 switch (aNodeType) {
78 case nsINode::ELEMENT_NODE:
79 case nsINode::ATTRIBUTE_NODE:
80 // Correct the case for HTML
81 if (aNodeType == nsINode::ELEMENT_NODE &&
82 aNamespaceID == kNameSpaceID_XHTML && GetDocument() &&
83 GetDocument()->IsHTMLDocument()) {
84 nsContentUtils::ASCIIToUpper(mQualifiedName, mNodeName);
85 } else {
86 mNodeName = mQualifiedName;
87 }
88 mInner.mName->ToString(mLocalName);
89 break;
90 case nsINode::TEXT_NODE:
91 case nsINode::CDATA_SECTION_NODE:
92 case nsINode::COMMENT_NODE:
93 case nsINode::DOCUMENT_NODE:
94 case nsINode::DOCUMENT_FRAGMENT_NODE:
95 mInner.mName->ToString(mNodeName);
96 SetDOMStringToNull(mLocalName);
97 break;
98 case nsINode::PROCESSING_INSTRUCTION_NODE:
99 case nsINode::DOCUMENT_TYPE_NODE:
100 mInner.mExtraName->ToString(mNodeName);
101 SetDOMStringToNull(mLocalName);
102 break;
103 default:
104 MOZ_ASSERT(aNodeType == UINT16_MAX, "Unknown node type");
105 }
106 }
107
108 // nsISupports
109
110 NS_IMPL_CYCLE_COLLECTION_CLASS(NodeInfo)
111
112 NS_IMPL_CYCLE_COLLECTION_UNLINK_0(NodeInfo)
113
114 static const char* kNodeInfoNSURIs[] = {
115 " ([none])", " (xmlns)", " (xml)", " (xhtml)", " (XLink)",
116 " (XSLT)", " (XBL)", " (MathML)", " (RDF)", " (XUL)"};
117
118 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(NodeInfo)
119 if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
120 char name[72];
121 uint32_t nsid = tmp->NamespaceID();
122 nsAtomCString localName(tmp->NameAtom());
123 if (nsid < ArrayLength(kNodeInfoNSURIs)) {
124 SprintfLiteral(name, "NodeInfo%s %s", kNodeInfoNSURIs[nsid],
125 localName.get());
126 } else {
127 SprintfLiteral(name, "NodeInfo %s", localName.get());
128 }
129
130 cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name);
131 } else {
132 NS_IMPL_CYCLE_COLLECTION_DESCRIBE(NodeInfo, tmp->mRefCnt.get())
133 }
134
135 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwnerManager)
136 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
137
138 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(NodeInfo)
139 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
140 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
141
142 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(NodeInfo)
143 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
144 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
145
146 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(NodeInfo)
147 return nsCCUncollectableMarker::sGeneration && tmp->CanSkip();
148 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
149
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(NodeInfo,AddRef)150 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(NodeInfo, AddRef)
151 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(NodeInfo, Release)
152
153 void NodeInfo::GetName(nsAString& aName) const {
154 mInner.mName->ToString(aName);
155 }
156
GetPrefix(nsAString & aPrefix) const157 void NodeInfo::GetPrefix(nsAString& aPrefix) const {
158 if (mInner.mPrefix) {
159 mInner.mPrefix->ToString(aPrefix);
160 } else {
161 SetDOMStringToNull(aPrefix);
162 }
163 }
164
GetNamespaceURI(nsAString & aNameSpaceURI) const165 void NodeInfo::GetNamespaceURI(nsAString& aNameSpaceURI) const {
166 if (mInner.mNamespaceID > 0) {
167 nsresult rv = nsContentUtils::NameSpaceManager()->GetNameSpaceURI(
168 mInner.mNamespaceID, aNameSpaceURI);
169 // How can we possibly end up with a bogus namespace ID here?
170 if (NS_FAILED(rv)) {
171 MOZ_CRASH();
172 }
173 } else {
174 SetDOMStringToNull(aNameSpaceURI);
175 }
176 }
177
NamespaceEquals(const nsAString & aNamespaceURI) const178 bool NodeInfo::NamespaceEquals(const nsAString& aNamespaceURI) const {
179 int32_t nsid = nsContentUtils::NameSpaceManager()->GetNameSpaceID(
180 aNamespaceURI, nsContentUtils::IsChromeDoc(mOwnerManager->GetDocument()));
181
182 return mozilla::dom::NodeInfo::NamespaceEquals(nsid);
183 }
184
DeleteCycleCollectable()185 void NodeInfo::DeleteCycleCollectable() {
186 RefPtr<nsNodeInfoManager> kungFuDeathGrip = mOwnerManager;
187 mozilla::Unused
188 << kungFuDeathGrip; // Just keeping value alive for longer than this
189 delete this;
190 }
191
CanSkip()192 bool NodeInfo::CanSkip() {
193 return mDocument && nsCCUncollectableMarker::InGeneration(
194 mDocument->GetMarkedCCGeneration());
195 }
196