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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2010 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HTMLPreloadScanner_h
#define HTMLPreloadScanner_h
#include "core/CoreExport.h"
#include "core/css/MediaValuesCached.h"
#include "core/dom/ViewportDescription.h"
#include "core/html/parser/CSSPreloadScanner.h"
#include "core/html/parser/CompactHTMLToken.h"
#include "core/html/parser/HTMLToken.h"
#include "core/html/parser/PreloadRequest.h"
#include "platform/text/SegmentedString.h"
#include "wtf/PtrUtil.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
typedef size_t TokenPreloadScannerCheckpoint;
class HTMLParserOptions;
class HTMLTokenizer;
class SegmentedString;
struct ViewportDescriptionWrapper {
ViewportDescription description;
bool set;
ViewportDescriptionWrapper() : set(false) {}
};
struct CORE_EXPORT CachedDocumentParameters {
USING_FAST_MALLOC(CachedDocumentParameters);
public:
static std::unique_ptr<CachedDocumentParameters> create(Document* document) {
return WTF::wrapUnique(new CachedDocumentParameters(document));
}
static std::unique_ptr<CachedDocumentParameters> create() {
return WTF::wrapUnique(new CachedDocumentParameters);
}
bool doHtmlPreloadScanning;
bool doDocumentWritePreloadScanning;
Length defaultViewportMinWidth;
bool viewportMetaZeroValuesQuirk;
bool viewportMetaEnabled;
ReferrerPolicy referrerPolicy;
private:
explicit CachedDocumentParameters(Document*);
CachedDocumentParameters() = default;
};
class TokenPreloadScanner {
WTF_MAKE_NONCOPYABLE(TokenPreloadScanner);
USING_FAST_MALLOC(TokenPreloadScanner);
public:
TokenPreloadScanner(const KURL& documentURL,
std::unique_ptr<CachedDocumentParameters>,
const MediaValuesCached::MediaValuesCachedData&);
~TokenPreloadScanner();
void scan(const HTMLToken&,
const SegmentedString&,
PreloadRequestStream& requests,
ViewportDescriptionWrapper*,
bool* isCSPMetaTag);
void scan(const CompactHTMLToken&,
const SegmentedString&,
PreloadRequestStream& requests,
ViewportDescriptionWrapper*,
bool* isCSPMetaTag,
bool* likelyDocumentWriteScript);
void setPredictedBaseElementURL(const KURL& url) {
m_predictedBaseElementURL = url;
}
// A TokenPreloadScannerCheckpoint is valid until the next call to rewindTo,
// at which point all outstanding checkpoints are invalidated.
TokenPreloadScannerCheckpoint createCheckpoint();
void rewindTo(TokenPreloadScannerCheckpoint);
private:
class StartTagScanner;
bool shouldEvaluateForDocumentWrite(const String& source);
bool shouldEvaluateForDocumentWrite(const HTMLToken::DataVector& source) {
return false;
}
template <typename Token>
inline void scanCommon(const Token&,
const SegmentedString&,
PreloadRequestStream& requests,
ViewportDescriptionWrapper*,
bool* isCSPMetaTag,
bool* likelyDocumentWriteScript);
template <typename Token>
void updatePredictedBaseURL(const Token&);
struct Checkpoint {
Checkpoint(const KURL& predictedBaseElementURL,
bool inStyle,
bool inScript,
size_t templateCount)
: predictedBaseElementURL(predictedBaseElementURL),
inStyle(inStyle),
inScript(inScript),
templateCount(templateCount) {}
KURL predictedBaseElementURL;
bool inStyle;
bool inScript;
size_t templateCount;
};
struct PictureData {
PictureData() : sourceSize(0.0), sourceSizeSet(false), picked(false) {}
String sourceURL;
float sourceSize;
bool sourceSizeSet;
bool picked;
};
CSSPreloadScanner m_cssScanner;
const KURL m_documentURL;
KURL m_predictedBaseElementURL;
bool m_inStyle;
bool m_inPicture;
bool m_inScript;
PictureData m_pictureData;
size_t m_templateCount;
std::unique_ptr<CachedDocumentParameters> m_documentParameters;
Persistent<MediaValuesCached> m_mediaValues;
ClientHintsPreferences m_clientHintsPreferences;
bool m_didRewind = false;
Vector<Checkpoint> m_checkpoints;
};
class CORE_EXPORT HTMLPreloadScanner {
WTF_MAKE_NONCOPYABLE(HTMLPreloadScanner);
USING_FAST_MALLOC(HTMLPreloadScanner);
public:
static std::unique_ptr<HTMLPreloadScanner> create(
const HTMLParserOptions& options,
const KURL& documentURL,
std::unique_ptr<CachedDocumentParameters> documentParameters,
const MediaValuesCached::MediaValuesCachedData& mediaValuesCachedData) {
return WTF::wrapUnique(new HTMLPreloadScanner(options, documentURL,
std::move(documentParameters),
mediaValuesCachedData));
}
~HTMLPreloadScanner();
void appendToEnd(const SegmentedString&);
PreloadRequestStream scan(const KURL& documentBaseElementURL,
ViewportDescriptionWrapper*);
private:
HTMLPreloadScanner(const HTMLParserOptions&,
const KURL& documentURL,
std::unique_ptr<CachedDocumentParameters>,
const MediaValuesCached::MediaValuesCachedData&);
TokenPreloadScanner m_scanner;
SegmentedString m_source;
HTMLToken m_token;
std::unique_ptr<HTMLTokenizer> m_tokenizer;
};
} // namespace blink
#endif
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