| OLD | NEW |
|---|
| (Empty) |
| 1 /* | |
| 2 * Copyright (C) 2013 Google, Inc. All Rights Reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #include "sky/engine/core/html/parser/BackgroundHTMLParser.h" | |
| 27 | |
| 28 #include "base/bind.h" | |
| 29 #include "base/single_thread_task_runner.h" | |
| 30 #include "sky/engine/core/html/parser/HTMLDocumentParser.h" | |
| 31 #include "sky/engine/core/html/parser/HTMLParserIdioms.h" | |
| 32 #include "sky/engine/core/html/parser/TextResourceDecoder.h" | |
| 33 #include "sky/engine/public/platform/Platform.h" | |
| 34 #include "sky/engine/wtf/MainThread.h" | |
| 35 #include "sky/engine/wtf/text/TextPosition.h" | |
| 36 | |
| 37 namespace blink { | |
| 38 | |
| 39 // We limit our chucks to 1000 tokens, to make sure the main | |
| 40 // thread is never waiting on the parser thread for tokens. | |
| 41 // This was tuned in https://bugs.webkit.org/show_bug.cgi?id=110408. | |
| 42 static const size_t pendingTokenLimit = 1000; | |
| 43 | |
| 44 #if ENABLE(ASSERT) | |
| 45 | |
| 46 static void checkThatTokensAreSafeToSendToAnotherThread(const CompactHTMLTokenSt
ream* tokens) | |
| 47 { | |
| 48 for (size_t i = 0; i < tokens->size(); ++i) | |
| 49 ASSERT(tokens->at(i).isSafeToSendToAnotherThread()); | |
| 50 } | |
| 51 | |
| 52 #endif | |
| 53 | |
| 54 base::WeakPtr<BackgroundHTMLParser> BackgroundHTMLParser::create(PassOwnPtr<Back
groundHTMLParser::Configuration> config) | |
| 55 { | |
| 56 // Caller must free by calling stop(). | |
| 57 BackgroundHTMLParser* parser = new BackgroundHTMLParser(config); | |
| 58 return parser->m_weakFactory.GetWeakPtr(); | |
| 59 } | |
| 60 | |
| 61 BackgroundHTMLParser::BackgroundHTMLParser(PassOwnPtr<Configuration> config) | |
| 62 : m_state(InitialState) | |
| 63 , m_token(adoptPtr(new HTMLToken)) | |
| 64 , m_tokenizer(HTMLTokenizer::create()) | |
| 65 , m_parser(config->parser) | |
| 66 , m_pendingTokens(adoptPtr(new CompactHTMLTokenStream)) | |
| 67 , m_decoder(TextResourceDecoder::create()) | |
| 68 , m_source(config->source.Pass()) | |
| 69 , m_weakFactory(this) | |
| 70 { | |
| 71 } | |
| 72 | |
| 73 BackgroundHTMLParser::~BackgroundHTMLParser() | |
| 74 { | |
| 75 } | |
| 76 | |
| 77 void BackgroundHTMLParser::start() | |
| 78 { | |
| 79 m_drainer = adoptPtr(new mojo::common::DataPipeDrainer(this, m_source.Pass()
)); | |
| 80 } | |
| 81 | |
| 82 void BackgroundHTMLParser::stop() | |
| 83 { | |
| 84 delete this; | |
| 85 } | |
| 86 | |
| 87 void BackgroundHTMLParser::OnDataAvailable(const void* data, size_t numberOfByte
s) | |
| 88 { | |
| 89 ASSERT(!m_input.isClosed()); | |
| 90 String input = m_decoder->decode(static_cast<const char*>(data), numberOfByt
es); | |
| 91 m_input.append(SegmentedString(input)); | |
| 92 pumpTokenizer(); | |
| 93 } | |
| 94 | |
| 95 void BackgroundHTMLParser::OnDataComplete() | |
| 96 { | |
| 97 ASSERT(!m_input.isClosed()); | |
| 98 finish(); | |
| 99 } | |
| 100 | |
| 101 void BackgroundHTMLParser::finish() | |
| 102 { | |
| 103 m_input.append(SegmentedString(m_decoder->flush())); | |
| 104 markEndOfFile(); | |
| 105 pumpTokenizer(); | |
| 106 } | |
| 107 | |
| 108 void BackgroundHTMLParser::markEndOfFile() | |
| 109 { | |
| 110 ASSERT(!m_input.isClosed()); | |
| 111 m_input.append(SegmentedString(String(&kEndOfFileMarker, 1))); | |
| 112 m_input.close(); | |
| 113 } | |
| 114 | |
| 115 BackgroundHTMLParser::ContinueBehavior BackgroundHTMLParser::updateTokenizerStat
e(const CompactHTMLToken& lastToken) | |
| 116 { | |
| 117 if (lastToken.type() == HTMLToken::StartTag) { | |
| 118 const String& tagName = lastToken.data(); | |
| 119 | |
| 120 if (threadSafeMatch(tagName, HTMLNames::scriptTag) || threadSafeMatch(ta
gName, HTMLNames::styleTag)) | |
| 121 m_tokenizer->setState(HTMLTokenizer::RawDataState); | |
| 122 | |
| 123 if (threadSafeMatch(tagName, HTMLNames::importTag)) { | |
| 124 m_state = DidSeeImportState; | |
| 125 return ContinueParsing; | |
| 126 } | |
| 127 | |
| 128 if (m_state == InitialState) | |
| 129 return ContinueParsing; | |
| 130 | |
| 131 // If we hit a start tag which is not an <import> tag while in the | |
| 132 // have-seen-import state, we need to send all but the last token. | |
| 133 // This lets the main thread see all import tags in one chunk. | |
| 134 // TODO(eseidel): We could replace this with a preloader and then | |
| 135 // simply yield after every </import> regardless. | |
| 136 m_state = InitialState; | |
| 137 return SendTokensExceptingLast; | |
| 138 } | |
| 139 | |
| 140 // We send all tokens at the end of every </script> | |
| 141 if (lastToken.type() == HTMLToken::EndTag && threadSafeMatch(lastToken.data(
), HTMLNames::scriptTag)) | |
| 142 return SendTokensIncludingLast; | |
| 143 | |
| 144 return ContinueParsing; | |
| 145 } | |
| 146 | |
| 147 void BackgroundHTMLParser::pumpTokenizer() | |
| 148 { | |
| 149 while (true) { | |
| 150 if (!m_tokenizer->nextToken(m_input, *m_token)) { | |
| 151 // We've reached the end of our current input. | |
| 152 sendTokensToMainThread(); | |
| 153 break; | |
| 154 } | |
| 155 | |
| 156 ContinueBehavior result; | |
| 157 { | |
| 158 CompactHTMLToken token(m_token.get(), TextPosition(m_input.currentLi
ne(), m_input.currentColumn())); | |
| 159 result = updateTokenizerState(token); | |
| 160 if (result == SendTokensExceptingLast) | |
| 161 sendTokensToMainThread(); | |
| 162 | |
| 163 m_pendingTokens->append(token); | |
| 164 } | |
| 165 | |
| 166 m_token->clear(); | |
| 167 | |
| 168 if (result == SendTokensIncludingLast || m_pendingTokens->size() >= pend
ingTokenLimit) | |
| 169 sendTokensToMainThread(); | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 void BackgroundHTMLParser::sendTokensToMainThread() | |
| 174 { | |
| 175 if (m_pendingTokens->isEmpty()) | |
| 176 return; | |
| 177 | |
| 178 #if ENABLE(ASSERT) | |
| 179 checkThatTokensAreSafeToSendToAnotherThread(m_pendingTokens.get()); | |
| 180 #endif | |
| 181 | |
| 182 OwnPtr<HTMLDocumentParser::ParsedChunk> chunk = adoptPtr(new HTMLDocumentPar
ser::ParsedChunk); | |
| 183 chunk->tokens = m_pendingTokens.release(); | |
| 184 Platform::current()->mainThreadTaskRunner()->PostTask(FROM_HERE, | |
| 185 base::Bind(&HTMLDocumentParser::didReceiveParsedChunkFromBackgroundParse
r, m_parser, chunk.release())); | |
| 186 | |
| 187 m_pendingTokens = adoptPtr(new CompactHTMLTokenStream); | |
| 188 } | |
| 189 | |
| 190 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1215103007:
Remove remaining HTML elements (Closed)
Base URL: git@github.com:domokit/mojo.git@master