1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* 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/. */
#include "nsHtml5StringParser.h"
#include "nsHtml5DependentUTF16Buffer.h"
#include "nsHtml5Tokenizer.h"
#include "nsHtml5TreeBuilder.h"
#include "nsHtml5TreeOpExecutor.h"
#include "nsIContent.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentFragment.h"
using mozilla::dom::Document;
NS_IMPL_ISUPPORTS0(nsHtml5StringParser)
nsHtml5StringParser::nsHtml5StringParser()
: mBuilder(new nsHtml5OplessBuilder()),
mTreeBuilder(new nsHtml5TreeBuilder(mBuilder)),
mTokenizer(new nsHtml5Tokenizer(mTreeBuilder.get(), false)) {
mTokenizer->setInterner(&mAtomTable);
mTokenizer->setKeepBuffer(true);
mTreeBuilder->setKeepBuffer(true);
}
nsHtml5StringParser::~nsHtml5StringParser() { ClearCaches(); }
nsresult nsHtml5StringParser::ParseFragment(
const nsAString& aSourceBuffer, nsIContent* aTargetNode,
nsAtom* aContextLocalName, int32_t aContextNamespace, bool aQuirks,
bool aPreventScriptExecution, bool aAllowDeclarativeShadowRoots) {
NS_ENSURE_TRUE(aSourceBuffer.Length() <= INT32_MAX, NS_ERROR_OUT_OF_MEMORY);
Document* doc = aTargetNode->OwnerDoc();
nsIURI* uri = doc->GetDocumentURI();
NS_ENSURE_TRUE(uri, NS_ERROR_NOT_AVAILABLE);
mTreeBuilder->setFragmentContext(aContextLocalName, aContextNamespace,
aTargetNode, aQuirks);
#ifdef DEBUG
if (!aPreventScriptExecution) {
NS_ASSERTION(!aTargetNode->IsInUncomposedDoc(),
"If script execution isn't prevented, "
"the target node must not be in doc.");
NS_ASSERTION(
aTargetNode->NodeType() == nsINode::DOCUMENT_FRAGMENT_NODE,
"If script execution isn't prevented, must parse to DOM fragment.");
}
#endif
mTreeBuilder->SetPreventScriptExecution(aPreventScriptExecution);
return Tokenize(aSourceBuffer, doc, true, aAllowDeclarativeShadowRoots);
}
nsresult nsHtml5StringParser::ParseDocument(
const nsAString& aSourceBuffer, Document* aTargetDoc,
bool aScriptingEnabledForNoscriptParsing) {
MOZ_ASSERT(!aTargetDoc->GetFirstChild());
NS_ENSURE_TRUE(aSourceBuffer.Length() <= INT32_MAX, NS_ERROR_OUT_OF_MEMORY);
mTreeBuilder->setFragmentContext(nullptr, kNameSpaceID_None, nullptr, false);
mTreeBuilder->SetPreventScriptExecution(true);
return Tokenize(aSourceBuffer, aTargetDoc,
aScriptingEnabledForNoscriptParsing,
aTargetDoc->AllowsDeclarativeShadowRoots());
}
void nsHtml5StringParser::ClearCaches() {
mTokenizer->dropBufferIfLongerThan(0);
mTreeBuilder->dropBufferIfLongerThan(0);
if (mCacheClearer) {
mCacheClearer->Disconnect();
mCacheClearer = nullptr;
}
}
void nsHtml5StringParser::TryCache() {
const int32_t kMaxBuffer = 1024 * 1024;
bool didDrop = mTokenizer->dropBufferIfLongerThan(kMaxBuffer);
didDrop |= mTreeBuilder->dropBufferIfLongerThan(kMaxBuffer);
if (didDrop) {
return;
}
if (!mCacheClearer) {
mCacheClearer = new CacheClearer(this);
nsCOMPtr<nsIRunnable> runnable = mCacheClearer.get();
NS_DispatchToMainThreadQueue(runnable.forget(),
mozilla::EventQueuePriority::Idle);
}
}
nsresult nsHtml5StringParser::Tokenize(const nsAString& aSourceBuffer,
Document* aDocument,
bool aScriptingEnabledForNoscriptParsing,
bool aDeclarativeShadowRootsAllowed) {
nsIURI* uri = aDocument->GetDocumentURI();
mBuilder->Init(aDocument, uri, nullptr, nullptr);
mBuilder->SetParser(this);
mBuilder->SetNodeInfoManager(aDocument->NodeInfoManager());
// Mark the parser as *not* broken by passing NS_OK
nsresult rv = mBuilder->MarkAsBroken(NS_OK);
mTreeBuilder->setScriptingEnabled(aScriptingEnabledForNoscriptParsing);
mTreeBuilder->setIsSrcdocDocument(aDocument->IsSrcdocDocument());
mTreeBuilder->setAllowDeclarativeShadowRoots(aDeclarativeShadowRootsAllowed);
mBuilder->Start();
mTokenizer->start();
if (!aSourceBuffer.IsEmpty()) {
bool lastWasCR = false;
nsHtml5DependentUTF16Buffer buffer(aSourceBuffer);
while (buffer.hasMore()) {
buffer.adjust(lastWasCR);
lastWasCR = false;
if (buffer.hasMore()) {
if (!mTokenizer->EnsureBufferSpace(buffer.getLength())) {
rv = mBuilder->MarkAsBroken(NS_ERROR_OUT_OF_MEMORY);
break;
}
lastWasCR = mTokenizer->tokenizeBuffer(&buffer);
if (NS_FAILED(rv = mBuilder->IsBroken())) {
break;
}
}
}
}
if (NS_SUCCEEDED(rv)) {
mTokenizer->eof();
}
mTokenizer->end();
mBuilder->Finish();
mAtomTable.Clear();
TryCache();
return rv;
}
|
