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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MediaQueryParser_h
#define MediaQueryParser_h
#include "core/css/CSSParserValues.h"
#include "core/css/MediaList.h"
#include "core/css/MediaQuery.h"
#include "core/css/MediaQueryExp.h"
#include "core/css/parser/MediaQueryToken.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class MediaQuerySet;
class MediaQueryData {
STACK_ALLOCATED();
private:
MediaQuery::Restrictor m_restrictor;
String m_mediaType;
OwnPtrWillBeMember<ExpressionHeapVector> m_expressions;
String m_mediaFeature;
CSSParserValueList m_valueList;
bool m_mediaTypeSet;
public:
MediaQueryData();
void clear();
bool addExpression();
void addParserValue(MediaQueryTokenType, MediaQueryToken&);
void setMediaType(const String&);
PassOwnPtrWillBeRawPtr<MediaQuery> takeMediaQuery();
inline bool currentMediaQueryChanged() const
{
return (m_restrictor != MediaQuery::None || m_mediaTypeSet || m_expressions->size() > 0);
}
inline void setRestrictor(MediaQuery::Restrictor restrictor) { m_restrictor = restrictor; }
inline void setMediaFeature(const String& str) { m_mediaFeature = str; }
};
class MediaQueryParser {
STACK_ALLOCATED();
public:
typedef Vector<MediaQueryToken>::iterator TokenIterator;
static PassRefPtrWillBeRawPtr<MediaQuerySet> parseMediaQuerySet(const String&);
static PassRefPtrWillBeRawPtr<MediaQuerySet> parseMediaCondition(TokenIterator, TokenIterator endToken);
private:
enum ParserType {
MediaQuerySetParser,
MediaConditionParser,
};
MediaQueryParser(ParserType);
virtual ~MediaQueryParser();
PassRefPtrWillBeRawPtr<MediaQuerySet> parseImpl(TokenIterator, TokenIterator endToken);
enum BlockType {
ParenthesisBlock,
BracketsBlock,
BracesBlock
};
enum StateChange {
ModifyState,
DoNotModifyState
};
struct BlockParameters {
MediaQueryTokenType leftToken;
MediaQueryTokenType rightToken;
BlockType blockType;
StateChange stateChange;
};
void processToken(TokenIterator&);
void readRestrictor(MediaQueryTokenType, TokenIterator&);
void readMediaType(MediaQueryTokenType, TokenIterator&);
void readAnd(MediaQueryTokenType, TokenIterator&);
void readFeatureStart(MediaQueryTokenType, TokenIterator&);
void readFeature(MediaQueryTokenType, TokenIterator&);
void readFeatureColon(MediaQueryTokenType, TokenIterator&);
void readFeatureValue(MediaQueryTokenType, TokenIterator&);
void readFeatureEnd(MediaQueryTokenType, TokenIterator&);
void skipUntilComma(MediaQueryTokenType, TokenIterator&);
void skipUntilBlockEnd(MediaQueryTokenType, TokenIterator&);
void done(MediaQueryTokenType, TokenIterator&);
typedef void (MediaQueryParser::*State)(MediaQueryTokenType, TokenIterator&);
void setStateAndRestrict(State, MediaQuery::Restrictor);
bool observeBlock(BlockParameters&, MediaQueryTokenType);
void observeBlocks(MediaQueryTokenType);
static void popIfBlockMatches(Vector<MediaQueryParser::BlockType>& blockStack, BlockType);
State m_state;
MediaQueryData m_mediaQueryData;
RefPtrWillBeMember<MediaQuerySet> m_querySet;
Vector<BlockType> m_blockStack;
const static State ReadRestrictor;
const static State ReadMediaType;
const static State ReadAnd;
const static State ReadFeatureStart;
const static State ReadFeature;
const static State ReadFeatureColon;
const static State ReadFeatureValue;
const static State ReadFeatureEnd;
const static State SkipUntilComma;
const static State SkipUntilBlockEnd;
const static State Done;
};
} // namespace WebCore
#endif // MediaQueryParser_h
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