Revert 169289 "A thread-safe Media Query Parser"

trunk/Source/core/css/parser/MediaQueryParser.cpp

-// 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.
-
-#include "config.h"
-#include "core/css/parser/MediaQueryParser.h"
-
-#include "MediaTypeNames.h"
-#include "core/css/parser/CSSPropertyParser.h"
-#include "core/css/parser/MediaQueryTokenizer.h"
-
-namespace WebCore {
-
-PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parse(const String& queryString)
-{
-    return MediaQueryParser(queryString).parseImpl();
-}
-
-const MediaQueryParser::State MediaQueryParser::ReadRestrictor = &MediaQueryParser::readRestrictor;
-const MediaQueryParser::State MediaQueryParser::ReadMediaType = &MediaQueryParser::readMediaType;
-const MediaQueryParser::State MediaQueryParser::ReadAnd = &MediaQueryParser::readAnd;
-const MediaQueryParser::State MediaQueryParser::ReadFeatureStart = &MediaQueryParser::readFeatureStart;
-const MediaQueryParser::State MediaQueryParser::ReadFeature = &MediaQueryParser::readFeature;
-const MediaQueryParser::State MediaQueryParser::ReadFeatureColon = &MediaQueryParser::readFeatureColon;
-const MediaQueryParser::State MediaQueryParser::ReadFeatureValue = &MediaQueryParser::readFeatureValue;
-const MediaQueryParser::State MediaQueryParser::ReadFeatureEnd = &MediaQueryParser::readFeatureEnd;
-const MediaQueryParser::State MediaQueryParser::SkipUntilComma = &MediaQueryParser::skipUntilComma;
-const MediaQueryParser::State MediaQueryParser::SkipUntilParenthesis = &MediaQueryParser::skipUntilParenthesis;
-const MediaQueryParser::State MediaQueryParser::Done = &MediaQueryParser::done;
-
-// FIXME: Replace the MediaQueryTokenizer with a generic CSSTokenizer, once there is one,
-// or better yet, replace the MediaQueryParser with a generic thread-safe CSS parser.
-MediaQueryParser::MediaQueryParser(const String& queryString)
-    : m_state(&MediaQueryParser::readRestrictor)
-    , m_querySet(MediaQuerySet::create())
-{
-    MediaQueryTokenizer::tokenize(queryString, m_tokens);
-}
-
-void MediaQueryParser::setStateAndRestrict(State state, MediaQuery::Restrictor restrictor)
-{
-    m_mediaQueryData.setRestrictor(restrictor);
-    m_state = state;
-}
-
-// State machine member functions start here
-void MediaQueryParser::readRestrictor(MediaQueryTokenType type, TokenIterator& token)
-{
-    readMediaType(type, token);
-}
-
-void MediaQueryParser::readMediaType(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == LeftParenthesisToken) {
-        m_state = ReadFeature;
-    } else if (type == IdentToken) {
-        if (m_state == ReadRestrictor && equalIgnoringCase(token->value(), "not")) {
-            setStateAndRestrict(ReadMediaType, MediaQuery::Not);
-        } else if (m_state == ReadRestrictor && equalIgnoringCase(token->value(), "only")) {
-            setStateAndRestrict(ReadMediaType, MediaQuery::Only);
-        } else {
-            m_mediaQueryData.setMediaType(token->value());
-            m_state = ReadAnd;
-        }
-    } else if (type == EOFToken && (!m_querySet->queryVector().size() || m_state != ReadRestrictor)) {
-        m_state = Done;
-    } else {
-        if (type == CommaToken)
-            --token;
-        m_state = SkipUntilComma;
-    }
-}
-
-void MediaQueryParser::readAnd(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == IdentToken && equalIgnoringCase(token->value(), "and")) {
-        m_state = ReadFeatureStart;
-    } else if (type == CommaToken) {
-        m_querySet->addMediaQuery(m_mediaQueryData.takeMediaQuery());
-        m_state = ReadRestrictor;
-    } else if (type == EOFToken) {
-        m_state = Done;
-    } else {
-        m_state = SkipUntilComma;
-    }
-}
-
-void MediaQueryParser::readFeatureStart(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == LeftParenthesisToken)
-        m_state = ReadFeature;
-    else
-        m_state = SkipUntilComma;
-}
-
-void MediaQueryParser::readFeature(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == IdentToken) {
-        m_mediaQueryData.setMediaFeature(token->value());
-        m_state = ReadFeatureColon;
-    } else {
-        m_state = SkipUntilComma;
-    }
-}
-
-void MediaQueryParser::readFeatureColon(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == ColonToken) {
-        m_state = ReadFeatureValue;
-    } else if (type == RightParenthesisToken || type == EOFToken) {
-        --token;
-        m_state = ReadFeatureEnd;
-    } else {
-        m_state = SkipUntilParenthesis;
-    }
-}
-
-void MediaQueryParser::readFeatureValue(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == DimensionToken && token->unitType() == CSSPrimitiveValue::CSS_UNKNOWN) {
-        m_state = SkipUntilComma;
-    } else {
-        m_mediaQueryData.addParserValue(type, *token);
-        m_state = ReadFeatureEnd;
-    }
-}
-
-void MediaQueryParser::readFeatureEnd(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == RightParenthesisToken || type == EOFToken) {
-        if (m_mediaQueryData.addExpression())
-            m_state = ReadAnd;
-        else
-            m_state = SkipUntilComma;
-    } else if (type == DelimiterToken && token->delimiter() == '/') {
-        m_mediaQueryData.addParserValue(type, *token);
-        m_state = ReadFeatureValue;
-    } else {
-        m_state = SkipUntilParenthesis;
-    }
-}
-
-void MediaQueryParser::skipUntilComma(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == CommaToken || type == EOFToken) {
-        m_state = ReadRestrictor;
-        m_mediaQueryData.clear();
-        m_querySet->addMediaQuery(MediaQuery::createNotAll());
-    }
-}
-
-void MediaQueryParser::skipUntilParenthesis(MediaQueryTokenType type, TokenIterator& token)
-{
-    if (type == RightParenthesisToken)
-        m_state = SkipUntilComma;
-}
-
-void MediaQueryParser::done(MediaQueryTokenType type, TokenIterator& token) { }
-
-void MediaQueryParser::processToken(TokenIterator& token)
-{
-    MediaQueryTokenType type = token->type();
-
-    // Call the function that handles current state
-    if (type != WhitespaceToken)
-        ((this)->*(m_state))(type, token);
-}
-
-// The state machine loop
-PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parseImpl()
-{
-    for (Vector<MediaQueryToken>::iterator token = m_tokens.begin(); token != m_tokens.end(); ++token)
-        processToken(token);
-
-    if (m_state != ReadAnd && m_state != ReadRestrictor && m_state != Done)
-        m_querySet->addMediaQuery(MediaQuery::createNotAll());
-    else if (m_mediaQueryData.currentMediaQueryChanged())
-        m_querySet->addMediaQuery(m_mediaQueryData.takeMediaQuery());
-
-    return m_querySet;
-}
-
-MediaQueryData::MediaQueryData()
-    : m_restrictor(MediaQuery::None)
-    , m_mediaType(MediaTypeNames::all)
-    , m_expressions(adoptPtr(new ExpressionHeapVector))
-    , m_mediaTypeSet(false)
-{
-}
-
-void MediaQueryData::clear()
-{
-    m_restrictor = MediaQuery::None;
-    m_mediaType = MediaTypeNames::all;
-    m_mediaTypeSet = false;
-    m_mediaFeature = String();
-    m_valueList.clear();
-    m_expressions = adoptPtr(new ExpressionHeapVector);
-}
-
-PassOwnPtr<MediaQuery> MediaQueryData::takeMediaQuery()
-{
-    OwnPtr<MediaQuery> mediaQuery = adoptPtr(new MediaQuery(m_restrictor, m_mediaType, m_expressions.release()));
-    clear();
-    return mediaQuery.release();
-}
-
-bool MediaQueryData::addExpression()
-{
-    OwnPtr<MediaQueryExp> expression = MediaQueryExp::create(m_mediaFeature, &m_valueList);
-    bool isValid = !!expression;
-    m_expressions->append(expression.release());
-    m_valueList.clear();
-    return isValid;
-}
-
-void MediaQueryData::addParserValue(MediaQueryTokenType type, MediaQueryToken& token)
-{
-    CSSParserValue value;
-    if (type == NumberToken || type == PercentageToken || type == DimensionToken) {
-        value.setFromNumber(token.numericValue(), token.unitType());
-        value.isInt = (token.numericValueType() == IntegerValueType);
-    } else if (type == DelimiterToken) {
-        value.unit = CSSParserValue::Operator;
-        value.iValue = token.delimiter();
-    } else {
-        CSSParserFunction* function = new CSSParserFunction;
-        function->name.init(token.value());
-        value.setFromFunction(function);
-        CSSParserString tokenValue;
-        tokenValue.init(token.value());
-        value.id = cssValueKeywordID(tokenValue);
-    }
-    m_valueList.addValue(value);
-}
-
-void MediaQueryData::setMediaType(const String& mediaType)
-{
-    m_mediaType = mediaType;
-    m_mediaTypeSet = true;
-}
-
-} // namespace WebCore