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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 CSSPreloadScanner_h
#define CSSPreloadScanner_h
#include "core/fetch/ResourceOwner.h"
#include "core/html/parser/HTMLToken.h"
#include "core/html/parser/PreloadRequest.h"
#include "core/loader/resource/CSSStyleSheetResource.h"
#include "core/loader/resource/StyleSheetResourceClient.h"
#include "platform/heap/Handle.h"
#include "wtf/text/StringBuilder.h"
namespace blink {
class SegmentedString;
class HTMLResourcePreloader;
class CSSPreloadScanner {
DISALLOW_NEW();
WTF_MAKE_NONCOPYABLE(CSSPreloadScanner);
public:
CSSPreloadScanner();
~CSSPreloadScanner();
void reset();
void scan(const HTMLToken::DataVector&,
const SegmentedString&,
PreloadRequestStream&,
const KURL&);
void scan(const String&,
const SegmentedString&,
PreloadRequestStream&,
const KURL&);
void setReferrerPolicy(const ReferrerPolicy);
private:
enum State {
Initial,
MaybeComment,
Comment,
MaybeCommentEnd,
RuleStart,
Rule,
AfterRule,
RuleValue,
AfterRuleValue,
DoneParsingImportRules,
};
template <typename Char>
void scanCommon(const Char* begin,
const Char* end,
const SegmentedString&,
PreloadRequestStream&,
const KURL&);
inline void tokenize(UChar, const SegmentedString&);
void emitRule(const SegmentedString&);
State m_state = Initial;
StringBuilder m_rule;
StringBuilder m_ruleValue;
ReferrerPolicy m_referrerPolicy = ReferrerPolicyDefault;
// Below members only non-null during scan()
PreloadRequestStream* m_requests = nullptr;
const KURL* m_predictedBaseElementURL = nullptr;
};
// Each CSSPreloaderResourceClient keeps track of a single CSS resource, and
// drives a CSSPreloadScanner as raw data arrives for it. This lets us preload
// @import tags before parsing.
class CORE_EXPORT CSSPreloaderResourceClient
: public GarbageCollectedFinalized<CSSPreloaderResourceClient>,
public StyleSheetResourceClient {
USING_GARBAGE_COLLECTED_MIXIN(CSSPreloaderResourceClient);
public:
CSSPreloaderResourceClient(Resource*, HTMLResourcePreloader*);
~CSSPreloaderResourceClient();
void setCSSStyleSheet(const String& href,
const KURL& baseURL,
const String& charset,
const CSSStyleSheetResource*) override;
void didAppendFirstData(const CSSStyleSheetResource*) override;
String debugName() const override { return "CSSPreloaderResourceClient"; }
DECLARE_TRACE();
protected:
// Protected for tests, which don't want to initialize a fully featured
// DocumentLoader.
virtual void fetchPreloads(PreloadRequestStream& preloads);
private:
void scanCSS(const CSSStyleSheetResource*);
void clearResource();
enum PreloadPolicy {
ScanOnly,
ScanAndPreload,
};
const PreloadPolicy m_policy;
WeakMember<HTMLResourcePreloader> m_preloader;
WeakMember<CSSStyleSheetResource> m_resource;
};
} // namespace blink
#endif
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