/webview/native/Source/WebCore/css/CSSParser.cpp

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/*
 * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
 * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "CSSParser.h"

#include "CSSAspectRatioValue.h"
#include "CSSBorderImage.h"
#include "CSSCanvasValue.h"
#include "CSSCrossfadeValue.h"
#include "CSSCursorImageValue.h"
#include "CSSFontFaceRule.h"
#include "CSSFontFaceSrcValue.h"
#include "CSSFunctionValue.h"
#include "CSSGradientValue.h"
#include "CSSImageValue.h"
#include "CSSInheritedValue.h"
#include "CSSInitialValue.h"
#include "CSSLineBoxContainValue.h"
#include "CSSMediaRule.h"
#include "CSSPageRule.h"
#include "CSSPrimitiveValue.h"
#include "CSSProperty.h"
#include "CSSPropertySourceData.h"
#include "CSSReflectValue.h"
#include "CSSSelector.h"
#include "CSSTimingFunctionValue.h"
#include "CSSUnicodeRangeValue.h"
#include "CSSValueKeywords.h"
#include "CSSValueList.h"
#include "CSSValuePool.h"
#if ENABLE(CSS_VARIABLES)
#include "CSSVariableValue.h"
#endif
#include "CSSWrapShapes.h"
#include "Counter.h"
#include "Document.h"
#include "FloatConversion.h"
#include "FontFeatureValue.h"
#include "FontValue.h"
#include "HTMLParserIdioms.h"
#include "HashTools.h"
#include "MediaList.h"
#include "MediaQueryExp.h"
#include "Page.h"
#include "Pair.h"
#include "Rect.h"
#include "RenderTheme.h"
#include "RuntimeEnabledFeatures.h"
#include "SVGParserUtilities.h"
#include "Settings.h"
#include "ShadowValue.h"
#include "StylePropertySet.h"
#include "StylePropertyShorthand.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "TextEncoding.h"
#include "WebKitCSSKeyframeRule.h"
#include "WebKitCSSKeyframesRule.h"
#include "WebKitCSSRegionRule.h"
#include "WebKitCSSTransformValue.h"
#include <limits.h>
#include <wtf/BitArray.h>
#include <wtf/HexNumber.h>
#include <wtf/dtoa.h>
#include <wtf/text/StringBuffer.h>
#include <wtf/text/StringBuilder.h>

#if ENABLE(CSS_IMAGE_SET)
#include "CSSImageSetValue.h"
#endif

#if ENABLE(CSS_FILTERS)
#include "WebKitCSSFilterValue.h"
#if ENABLE(SVG)
#include "WebKitCSSSVGDocumentValue.h"
#endif
#endif

#if ENABLE(CSS_SHADERS)
#include "WebKitCSSShaderValue.h"
#endif

#if ENABLE(DASHBOARD_SUPPORT)
#include "DashboardRegion.h"
#endif

#define YYDEBUG 0

#if YYDEBUG > 0
extern int cssyydebug;
#endif

extern int cssyyparse(WebCore::CSSParser*);

using namespace std;
using namespace WTF;

namespace {

enum PropertyType {
    PropertyExplicit,
    PropertyImplicit
};

class ImplicitScope {
    WTF_MAKE_NONCOPYABLE(ImplicitScope);
public:
    ImplicitScope(WebCore::CSSParser* parser, PropertyType propertyType)
        : m_parser(parser)
    {
        m_parser->m_implicitShorthand = propertyType == PropertyImplicit;
    }

    ~ImplicitScope()
    {
        m_parser->m_implicitShorthand = false;
    }

private:
    WebCore::CSSParser* m_parser;
};

} // namespace

namespace WebCore {

static const unsigned INVALID_NUM_PARSED_PROPERTIES = UINT_MAX;
static const double MAX_SCALE = 1000000;

static bool equal(const CSSParserString& a, const char* b)
{
    for (int i = 0; i < a.length; ++i) {
        if (!b[i])
            return false;
        if (a.characters[i] != b[i])
            return false;
    }
    return !b[a.length];
}

static bool equalIgnoringCase(const CSSParserString& a, const char* b)
{
    for (int i = 0; i < a.length; ++i) {
        if (!b[i])
            return false;
        ASSERT(!isASCIIUpper(b[i]));
        if (toASCIILower(a.characters[i]) != b[i])
            return false;
    }
    return !b[a.length];
}

static bool hasPrefix(const char* string, unsigned length, const char* prefix)
{
    for (unsigned i = 0; i < length; ++i) {
        if (!prefix[i])
            return true;
        if (string[i] != prefix[i])
            return false;
    }
    return false;
}
    
const CSSParserContext& strictCSSParserContext()
{
    DEFINE_STATIC_LOCAL(CSSParserContext, strictContext, (CSSStrictMode));
    return strictContext;
}

CSSParserContext::CSSParserContext(CSSParserMode mode, const KURL& baseURL)
    : baseURL(baseURL)
    , mode(mode)
    , isHTMLDocument(false)
    , isCSSCustomFilterEnabled(false)
    , isCSSRegionsEnabled(false)
    , isCSSGridLayoutEnabled(false)
#if ENABLE(CSS_VARIABLES)
    , isCSSVariablesEnabled(false)
#endif
    , needsSiteSpecificQuirks(false)
    , enforcesCSSMIMETypeInNoQuirksMode(true)
{
}

CSSParserContext::CSSParserContext(Document* document, const KURL& baseURL, const String& charset)
    : baseURL(baseURL.isNull() ? document->baseURL() : baseURL)
    , charset(charset)
    , mode(document->inQuirksMode() ? CSSQuirksMode : CSSStrictMode)
    , isHTMLDocument(document->isHTMLDocument())
    , isCSSCustomFilterEnabled(document->settings() ? document->settings()->isCSSCustomFilterEnabled() : false)
    , isCSSRegionsEnabled(document->cssRegionsEnabled())
    , isCSSGridLayoutEnabled(document->cssGridLayoutEnabled())
#if ENABLE(CSS_VARIABLES)
    , isCSSVariablesEnabled(document->settings() ? document->settings()->cssVariablesEnabled() : false)
#endif
    , needsSiteSpecificQuirks(document->settings() ? document->settings()->needsSiteSpecificQuirks() : false)
    , enforcesCSSMIMETypeInNoQuirksMode(!document->settings() || document->settings()->enforceCSSMIMETypeInNoQuirksMode())
{
}

bool operator==(const CSSParserContext& a, const CSSParserContext& b)
{
    return a.baseURL == b.baseURL
        && a.charset == b.charset
        && a.mode == b.mode
        && a.isHTMLDocument == b.isHTMLDocument
        && a.isCSSCustomFilterEnabled == b.isCSSCustomFilterEnabled
        && a.isCSSRegionsEnabled == b.isCSSRegionsEnabled
        && a.isCSSGridLayoutEnabled == b.isCSSGridLayoutEnabled
#if ENABLE(CSS_VARIABLES)
        && a.isCSSVariablesEnabled == b.isCSSVariablesEnabled
#endif
        && a.needsSiteSpecificQuirks == b.needsSiteSpecificQuirks
        && a.enforcesCSSMIMETypeInNoQuirksMode == b.enforcesCSSMIMETypeInNoQuirksMode;
}

CSSParser::CSSParser(const CSSParserContext& context)
    : m_context(context)
    , m_important(false)
    , m_id(CSSPropertyInvalid)
    , m_styleSheet(0)
    , m_selectorListForParseSelector(0)
    , m_numParsedPropertiesBeforeMarginBox(INVALID_NUM_PARSED_PROPERTIES)
    , m_inParseShorthand(0)
    , m_currentShorthand(CSSPropertyInvalid)
    , m_implicitShorthand(false)
    , m_hasFontFaceOnlyValues(false)
    , m_hadSyntacticallyValidCSSRule(false)
    , m_defaultNamespace(starAtom)
    , m_parsedTextPrefixLength(0)
    , m_propertyRange(UINT_MAX, UINT_MAX)
    , m_ruleSourceDataResult(0)
    , m_parsingMode(NormalMode)
    , m_currentCharacter(0)
    , m_tokenStart(0)
    , m_token(0)
    , m_lineNumber(0)
    , m_lastSelectorLineNumber(0)
    , m_allowImportRules(true)
    , m_allowNamespaceDeclarations(true)
{
#if YYDEBUG > 0
    cssyydebug = 1;
#endif
    CSSPropertySourceData::init();
}

CSSParser::~CSSParser()
{
    clearProperties();

    fastDeleteAllValues(m_floatingSelectors);
    deleteAllValues(m_floatingSelectorVectors);
    deleteAllValues(m_floatingValueLists);
    deleteAllValues(m_floatingFunctions);
}

void CSSParserString::lower()
{
    // FIXME: If we need Unicode lowercasing here, then we probably want the real kind
    // that can potentially change the length of the string rather than the character
    // by character kind. If we don't need Unicode lowercasing, it would be good to
    // simplify this function.

    if (charactersAreAllASCII(characters, length)) {
        // Fast case for all-ASCII.
        for (int i = 0; i < length; i++)
            characters[i] = toASCIILower(characters[i]);
    } else {
        for (int i = 0; i < length; i++)
            characters[i] = Unicode::toLower(characters[i]);
    }
}

void CSSParser::setupParser(const char* prefix, const String& string, const char* suffix)
{
    m_parsedTextPrefixLength = strlen(prefix);
    int length = string.length() + m_parsedTextPrefixLength + strlen(suffix) + 1;

    m_dataStart = adoptArrayPtr(new UChar[length]);
    for (unsigned i = 0; i < m_parsedTextPrefixLength; i++)
        m_dataStart[i] = prefix[i];

    memcpy(m_dataStart.get() + m_parsedTextPrefixLength, string.characters(), string.length() * sizeof(UChar));

    unsigned start = m_parsedTextPrefixLength + string.length();
    unsigned end = start + strlen(suffix);
    for (unsigned i = start; i < end; i++)
        m_dataStart[i] = suffix[i - start];

    m_dataStart[length - 1] = 0;

    m_currentCharacter = m_tokenStart = m_dataStart.get();
}

void CSSParser::parseSheet(StyleSheetContents* sheet, const String& string, int startLineNumber, RuleSourceDataList* ruleSourceDataResult)
{
    setStyleSheet(sheet);
    m_defaultNamespace = starAtom; // Reset the default namespace.
    if (ruleSourceDataResult)
        m_currentRuleDataStack = adoptPtr(new RuleSourceDataList());
    m_ruleSourceDataResult = ruleSourceDataResult;

    m_lineNumber = startLineNumber;
    setupParser("", string, "");
    cssyyparse(this);
    m_currentRuleDataStack.clear();
    m_ruleSourceDataResult = 0;
    m_rule = 0;
}

PassRefPtr<StyleRuleBase> CSSParser::parseRule(StyleSheetContents* sheet, const String& string)
{
    setStyleSheet(sheet);
    m_allowNamespaceDeclarations = false;
    setupParser("@-webkit-rule{", string, "} ");
    cssyyparse(this);
    return m_rule.release();
}

PassRefPtr<StyleKeyframe> CSSParser::parseKeyframeRule(StyleSheetContents* sheet, const String& string)
{
    setStyleSheet(sheet);
    setupParser("@-webkit-keyframe-rule{ ", string, "} ");
    cssyyparse(this);
    return m_keyframe.release();
}

static inline bool isColorPropertyID(CSSPropertyID propertyId)
{
    switch (propertyId) {
    case CSSPropertyColor:
    case CSSPropertyBackgroundColor:
    case CSSPropertyBorderBottomColor:
    case CSSPropertyBorderLeftColor:
    case CSSPropertyBorderRightColor:
    case CSSPropertyBorderTopColor:
    case CSSPropertyOutlineColor:
    case CSSPropertyTextLineThroughColor:
    case CSSPropertyTextOverlineColor:
    case CSSPropertyTextUnderlineColor:
    case CSSPropertyWebkitBorderAfterColor:
    case CSSPropertyWebkitBorderBeforeColor:
    case CSSPropertyWebkitBorderEndColor:
    case CSSPropertyWebkitBorderStartColor:
    case CSSPropertyWebkitColumnRuleColor:
    case CSSPropertyWebkitTextEmphasisColor:
    case CSSPropertyWebkitTextFillColor:
    case CSSPropertyWebkitTextStrokeColor:
        return true;
    default:
        return false;
    }
}

static bool parseColorValue(StylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, CSSParserMode cssParserMode)
{
    ASSERT(!string.isEmpty());
    bool strict = isStrictParserMode(cssParserMode);
    if (!isColorPropertyID(propertyId))
        return false;
    CSSParserString cssString;
    cssString.characters = const_cast<UChar*>(string.characters());
    cssString.length = string.length();
    int valueID = cssValueKeywordID(cssString);
    bool validPrimitive = false;
    if (valueID == CSSValueWebkitText)
        validPrimitive = true;
    else if (valueID == CSSValueCurrentcolor)
        validPrimitive = true;
    else if ((valueID >= CSSValueAqua && valueID <= CSSValueWindowtext) || valueID == CSSValueMenu
             || (valueID >= CSSValueWebkitFocusRingColor && valueID < CSSValueWebkitText && !strict)) {
        validPrimitive = true;
    }

    if (validPrimitive) {
        RefPtr<CSSValue> value = cssValuePool().createIdentifierValue(valueID);
        declaration->addParsedProperty(CSSProperty(propertyId, value.release(), important));
        return true;
    }
    RGBA32 color;
    if (!CSSParser::fastParseColor(color, string, strict && string[0] != '#'))
        return false;
    RefPtr<CSSValue> value = cssValuePool().createColorValue(color);
    declaration->addParsedProperty(CSSProperty(propertyId, value.release(), important));
    return true;
}

static inline bool isSimpleLengthPropertyID(CSSPropertyID propertyId, bool& acceptsNegativeNumbers)
{
    switch (propertyId) {
    case CSSPropertyFontSize:
    case CSSPropertyHeight:
    case CSSPropertyWidth:
    case CSSPropertyMinHeight:
    case CSSPropertyMinWidth:
    case CSSPropertyPaddingBottom:
    case CSSPropertyPaddingLeft:
    case CSSPropertyPaddingRight:
    case CSSPropertyPaddingTop:
    case CSSPropertyWebkitLogicalWidth:
    case CSSPropertyWebkitLogicalHeight:
    case CSSPropertyWebkitMinLogicalWidth:
    case CSSPropertyWebkitMinLogicalHeight:
    case CSSPropertyWebkitPaddingAfter:
    case CSSPropertyWebkitPaddingBefore:
    case CSSPropertyWebkitPaddingEnd:
    case CSSPropertyWebkitPaddingStart:
        acceptsNegativeNumbers = false;
        return true;
#if ENABLE(CSS_EXCLUSIONS)
    case CSSPropertyWebkitWrapMargin:
    case CSSPropertyWebkitWrapPadding:
        acceptsNegativeNumbers = false;
        return RuntimeEnabledFeatures::cssExclusionsEnabled();
#endif
    case CSSPropertyBottom:
    case CSSPropertyLeft:
    case CSSPropertyMarginBottom:
    case CSSPropertyMarginLeft:
    case CSSPropertyMarginRight:
    case CSSPropertyMarginTop:
    case CSSPropertyRight:
    case CSSPropertyTextIndent:
    case CSSPropertyTop:
    case CSSPropertyWebkitMarginAfter:
    case CSSPropertyWebkitMarginBefore:
    case CSSPropertyWebkitMarginEnd:
    case CSSPropertyWebkitMarginStart:
        acceptsNegativeNumbers = true;
        return true;
    default:
        return false;
    }
}

template <typename CharType>
static inline bool parseSimpleLength(const CharType* characters, unsigned& length, CSSPrimitiveValue::UnitTypes& unit, double& number)
{
    if (length > 2 && (characters[length - 2] | 0x20) == 'p' && (characters[length - 1] | 0x20) == 'x') {
        length -= 2;
        unit = CSSPrimitiveValue::CSS_PX;
    } else if (length > 1 && characters[length - 1] == '%') {
        length -= 1;
        unit = CSSPrimitiveValue::CSS_PERCENTAGE;
    }

    // We rely on charactersToDouble for validation as well. The function
    // will set "ok" to "false" if the entire passed-in character range does
    // not represent a double.
    bool ok;
    number = charactersToDouble(characters, length, &ok);
    return ok;
}

static bool parseSimpleLengthValue(StylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, CSSParserMode cssParserMode)
{
    ASSERT(!string.isEmpty());
    bool acceptsNegativeNumbers;
    if (!isSimpleLengthPropertyID(propertyId, acceptsNegativeNumbers))
        return false;

    unsigned length = string.length();
    double number;
    CSSPrimitiveValue::UnitTypes unit = CSSPrimitiveValue::CSS_NUMBER;

    if (string.is8Bit()) {
        if (!parseSimpleLength(string.characters8(), length, unit, number))
            return false;
    } else {
        if (!parseSimpleLength(string.characters16(), length, unit, number))
            return false;
    }

    if (unit == CSSPrimitiveValue::CSS_NUMBER) {
        if (number && isStrictParserMode(cssParserMode))
            return false;
        unit = CSSPrimitiveValue::CSS_PX;
    }
    if (number < 0 && !acceptsNegativeNumbers)
        return false;

    RefPtr<CSSValue> value = cssValuePool().createValue(number, unit);
    declaration->addParsedProperty(CSSProperty(propertyId, value.release(), important));
    return true;
}

static inline bool isValidKeywordPropertyAndValue(CSSPropertyID propertyId, int valueID, const CSSParserContext& parserContext)
{
    if (!valueID)
        return false;

    switch (propertyId) {
    case CSSPropertyBorderCollapse: // collapse | separate | inherit
        if (valueID == CSSValueCollapse || valueID == CSSValueSeparate)
            return true;
        break;
    case CSSPropertyBorderTopStyle: // <border-style> | inherit
    case CSSPropertyBorderRightStyle: // Defined as: none | hidden | dotted | dashed |
    case CSSPropertyBorderBottomStyle: // solid | double | groove | ridge | inset | outset
    case CSSPropertyBorderLeftStyle:
    case CSSPropertyWebkitBorderAfterStyle:
    case CSSPropertyWebkitBorderBeforeStyle:
    case CSSPropertyWebkitBorderEndStyle:
    case CSSPropertyWebkitBorderStartStyle:
    case CSSPropertyWebkitColumnRuleStyle:
        if (valueID >= CSSValueNone && valueID <= CSSValueDouble)
            return true;
        break;
    case CSSPropertyBoxSizing:
         if (valueID == CSSValueBorderBox || valueID == CSSValueContentBox)
             return true;
         break;
    case CSSPropertyCaptionSide: // top | bottom | left | right | inherit
        if (valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueTop || valueID == CSSValueBottom)
            return true;
        break;
    case CSSPropertyClear: // none | left | right | both | inherit
        if (valueID == CSSValueNone || valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueBoth)
            return true;
        break;
    case CSSPropertyDirection: // ltr | rtl | inherit
        if (valueID == CSSValueLtr || valueID == CSSValueRtl)
            return true;
        break;
    case CSSPropertyDisplay:
        // inline | block | list-item | run-in | inline-block | table |
        // inline-table | table-row-group | table-header-group | table-footer-group | table-row |
        // table-column-group | table-column | table-cell | table-caption | -webkit-box | -webkit-inline-box | none | inherit
        // -webkit-flex | -webkit-inline-flex | -webkit-grid | -webkit-inline-grid
        if ((valueID >= CSSValueInline && valueID <= CSSValueWebkitInlineBox) || valueID == CSSValueNone)
            return true;
#if ENABLE(CSS3_FLEXBOX)
        if (valueID == CSSValueWebkitFlex || valueID == CSSValueWebkitInlineFlex)
            return true;
#endif
        if (parserContext.isCSSGridLayoutEnabled && (valueID == CSSValueWebkitGrid || valueID == CSSValueWebkitInlineGrid))
            return true;
        break;

    case CSSPropertyEmptyCells: // show | hide | inherit
        if (valueID == CSSValueShow || valueID == CSSValueHide)
            return true;
        break;
    case CSSPropertyFloat: // left | right | none | center (for buggy CSS, maps to none)
        if (valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueNone || valueID == CSSValueCenter)
            return true;
        break;
    case CSSPropertyFontStyle: // normal | italic | oblique | inherit
        if (valueID == CSSValueNormal || valueID == CSSValueItalic || valueID == CSSValueOblique)
            return true;
        break;
    case CSSPropertyImageRendering: // auto | optimizeContrast
        if (valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast)
            return true;
        break;
    case CSSPropertyListStylePosition: // inside | outside | inherit
        if (valueID == CSSValueInside || valueID == CSSValueOutside)
            return true;
        break;
    case CSSPropertyListStyleType:
        // See section CSS_PROP_LIST_STYLE_TYPE of file CSSValueKeywords.in
        // for the list of supported list-style-types.
        if ((valueID >= CSSValueDisc && valueID <= CSSValueKatakanaIroha) || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyOutlineStyle: // (<border-style> except hidden) | auto | inherit
        if (valueID == CSSValueAuto || valueID == CSSValueNone || (valueID >= CSSValueInset && valueID <= CSSValueDouble))
            return true;
        break;
    case CSSPropertyOverflowX:
    case CSSPropertyOverflowY: // visible | hidden | scroll | auto | marquee | overlay | inherit
        if (valueID == CSSValueVisible || valueID == CSSValueHidden || valueID == CSSValueScroll || valueID == CSSValueAuto || valueID == CSSValueOverlay || valueID == CSSValueWebkitMarquee)
            return true;
        break;
    case CSSPropertyPageBreakAfter: // auto | always | avoid | left | right | inherit
    case CSSPropertyPageBreakBefore:
    case CSSPropertyWebkitColumnBreakAfter:
    case CSSPropertyWebkitColumnBreakBefore:
        if (valueID == CSSValueAuto || valueID == CSSValueAlways || valueID == CSSValueAvoid || valueID == CSSValueLeft || valueID == CSSValueRight)
            return true;
        break;
    case CSSPropertyPageBreakInside: // avoid | auto | inherit
    case CSSPropertyWebkitColumnBreakInside:
        if (valueID == CSSValueAuto || valueID == CSSValueAvoid)
            return true;
        break;
    case CSSPropertyPointerEvents:
        // none | visiblePainted | visibleFill | visibleStroke | visible |
        // painted | fill | stroke | auto | all | inherit
        if (valueID == CSSValueVisible || valueID == CSSValueNone || valueID == CSSValueAll || valueID == CSSValueAuto || (valueID >= CSSValueVisiblepainted && valueID <= CSSValueStroke))
            return true;
        break;
    case CSSPropertyPosition: // static | relative | absolute | fixed | inherit
        if (valueID == CSSValueStatic || valueID == CSSValueRelative || valueID == CSSValueAbsolute || valueID == CSSValueFixed)
            return true;
        break;
    case CSSPropertyResize: // none | both | horizontal | vertical | auto
        if (valueID == CSSValueNone || valueID == CSSValueBoth || valueID == CSSValueHorizontal || valueID == CSSValueVertical || valueID == CSSValueAuto)
            return true;
        break;
    case CSSPropertySpeak: // none | normal | spell-out | digits | literal-punctuation | no-punctuation | inherit
        if (valueID == CSSValueNone || valueID == CSSValueNormal || valueID == CSSValueSpellOut || valueID == CSSValueDigits || valueID == CSSValueLiteralPunctuation || valueID == CSSValueNoPunctuation)
            return true;
        break;
    case CSSPropertyTableLayout: // auto | fixed | inherit
        if (valueID == CSSValueAuto || valueID == CSSValueFixed)
            return true;
        break;
    case CSSPropertyTextLineThroughMode:
    case CSSPropertyTextOverlineMode:
    case CSSPropertyTextUnderlineMode:
        if (valueID == CSSValueContinuous || valueID == CSSValueSkipWhiteSpace)
            return true;
        break;
    case CSSPropertyTextLineThroughStyle:
    case CSSPropertyTextOverlineStyle:
    case CSSPropertyTextUnderlineStyle:
        if (valueID == CSSValueNone || valueID == CSSValueSolid || valueID == CSSValueDouble || valueID == CSSValueDashed || valueID == CSSValueDotDash || valueID == CSSValueDotDotDash || valueID == CSSValueWave)
            return true;
        break;
    case CSSPropertyTextOverflow: // clip | ellipsis
        if (valueID == CSSValueClip || valueID == CSSValueEllipsis)
            return true;
        break;
    case CSSPropertyTextRendering: // auto | optimizeSpeed | optimizeLegibility | geometricPrecision
        if (valueID == CSSValueAuto || valueID == CSSValueOptimizespeed || valueID == CSSValueOptimizelegibility || valueID == CSSValueGeometricprecision)
            return true;
        break;
    case CSSPropertyTextTransform: // capitalize | uppercase | lowercase | none | inherit
        if ((valueID >= CSSValueCapitalize && valueID <= CSSValueLowercase) || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyVisibility: // visible | hidden | collapse | inherit
        if (valueID == CSSValueVisible || valueID == CSSValueHidden || valueID == CSSValueCollapse)
            return true;
        break;
    case CSSPropertyWebkitAppearance:
        if ((valueID >= CSSValueCheckbox && valueID <= CSSValueTextarea) || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyWebkitBackfaceVisibility:
        if (valueID == CSSValueVisible || valueID == CSSValueHidden)
            return true;
        break;
    case CSSPropertyWebkitBorderFit:
        if (valueID == CSSValueBorder || valueID == CSSValueLines)
            return true;
        break;
    case CSSPropertyWebkitBoxAlign:
        if (valueID == CSSValueStretch || valueID == CSSValueStart || valueID == CSSValueEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline)
            return true;
        break;
#if ENABLE(CSS_BOX_DECORATION_BREAK)
    case CSSPropertyWebkitBoxDecorationBreak:
         if (valueID == CSSValueClone || valueID == CSSValueSlice)
             return true;
         break;
#endif
    case CSSPropertyWebkitBoxDirection:
        if (valueID == CSSValueNormal || valueID == CSSValueReverse)
            return true;
        break;
    case CSSPropertyWebkitBoxLines:
        if (valueID == CSSValueSingle || valueID == CSSValueMultiple)
                return true;
        break;
    case CSSPropertyWebkitBoxOrient:
        if (valueID == CSSValueHorizontal || valueID == CSSValueVertical || valueID == CSSValueInlineAxis || valueID == CSSValueBlockAxis)
            return true;
        break;
    case CSSPropertyWebkitBoxPack:
        if (valueID == CSSValueStart || valueID == CSSValueEnd || valueID == CSSValueCenter || valueID == CSSValueJustify)
            return true;
        break;
    case CSSPropertyWebkitColorCorrection:
        if (valueID == CSSValueSrgb || valueID == CSSValueDefault)
            return true;
        break;
#if ENABLE(CSS3_FLEXBOX)
    case CSSPropertyWebkitAlignContent:
         if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueSpaceBetween || valueID == CSSValueSpaceAround || valueID == CSSValueStretch)
             return true;
         break;
    case CSSPropertyWebkitAlignItems:
        if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch)
            return true;
        break;
    case CSSPropertyWebkitAlignSelf:
        if (valueID == CSSValueAuto || valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch)
            return true;
        break;
    case CSSPropertyWebkitFlexDirection:
        if (valueID == CSSValueRow || valueID == CSSValueRowReverse || valueID == CSSValueColumn || valueID == CSSValueColumnReverse)
            return true;
        break;
    case CSSPropertyWebkitFlexWrap:
        if (valueID == CSSValueNone || valueID == CSSValueWrap || valueID == CSSValueWrapReverse)
             return true;
        break;
    case CSSPropertyWebkitJustifyContent:
        if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueSpaceBetween || valueID == CSSValueSpaceAround)
            return true;
        break;
#endif
    case CSSPropertyWebkitFontKerning:
        if (valueID == CSSValueAuto || valueID == CSSValueNormal || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyWebkitFontSmoothing:
        if (valueID == CSSValueAuto || valueID == CSSValueNone || valueID == CSSValueAntialiased || valueID == CSSValueSubpixelAntialiased)
            return true;
        break;
    case CSSPropertyWebkitHyphens:
        if (valueID == CSSValueNone || valueID == CSSValueManual || valueID == CSSValueAuto)
            return true;
        break;
    case CSSPropertyWebkitLineAlign:
        if (valueID == CSSValueNone || valueID == CSSValueEdges)
            return true;
        break;
    case CSSPropertyWebkitLineBreak: // normal | after-white-space
        if (valueID == CSSValueNormal || valueID == CSSValueAfterWhiteSpace)
            return true;
        break;
    case CSSPropertyWebkitLineSnap:
        if (valueID == CSSValueNone || valueID == CSSValueBaseline || valueID == CSSValueContain)
            return true;
        break;
    case CSSPropertyWebkitMarginAfterCollapse:
    case CSSPropertyWebkitMarginBeforeCollapse:
    case CSSPropertyWebkitMarginBottomCollapse:
    case CSSPropertyWebkitMarginTopCollapse:
        if (valueID == CSSValueCollapse || valueID == CSSValueSeparate || valueID == CSSValueDiscard)
            return true;
        break;
    case CSSPropertyWebkitMarqueeDirection:
        if (valueID == CSSValueForwards || valueID == CSSValueBackwards || valueID == CSSValueAhead || valueID == CSSValueReverse || valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueDown
            || valueID == CSSValueUp || valueID == CSSValueAuto)
            return true;
        break;
    case CSSPropertyWebkitMarqueeStyle:
        if (valueID == CSSValueNone || valueID == CSSValueSlide || valueID == CSSValueScroll || valueID == CSSValueAlternate)
            return true;
        break;
    case CSSPropertyWebkitNbspMode: // normal | space
        if (valueID == CSSValueNormal || valueID == CSSValueSpace)
            return true;
        break;
#if ENABLE(OVERFLOW_SCROLLING)
    case CSSPropertyWebkitOverflowScrolling:
        if (valueID == CSSValueAuto || valueID == CSSValueTouch)
            return true;
        break;
#endif
    case CSSPropertyWebkitPrintColorAdjust:
        if (valueID == CSSValueExact || valueID == CSSValueEconomy)
            return true;
        break;
#if ENABLE(CSS_REGIONS)
    case CSSPropertyWebkitRegionBreakAfter:
    case CSSPropertyWebkitRegionBreakBefore:
        if (parserContext.isCSSRegionsEnabled && (valueID == CSSValueAuto || valueID == CSSValueAlways || valueID == CSSValueAvoid || valueID == CSSValueLeft || valueID == CSSValueRight))
            return true;
        break;
    case CSSPropertyWebkitRegionBreakInside:
        if (parserContext.isCSSRegionsEnabled && (valueID == CSSValueAuto || valueID == CSSValueAvoid))
            return true;
        break;
    case CSSPropertyWebkitRegionOverflow:
        if (parserContext.isCSSRegionsEnabled && (valueID == CSSValueAuto || valueID == CSSValueBreak))
            return true;
        break;
#endif
    case CSSPropertyWebkitRtlOrdering:
        if (valueID == CSSValueLogical || valueID == CSSValueVisual)
            return true;
        break;
    case CSSPropertyWebkitTextCombine:
        if (valueID == CSSValueNone || valueID == CSSValueHorizontal)
            return true;
        break;
    case CSSPropertyWebkitTextEmphasisPosition:
        if (valueID == CSSValueOver || valueID == CSSValueUnder)
            return true;
        break;
    case CSSPropertyWebkitTextSecurity:
        // disc | circle | square | none | inherit
        if (valueID == CSSValueDisc || valueID == CSSValueCircle || valueID == CSSValueSquare || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyWebkitTextSizeAdjust:
        if (valueID == CSSValueAuto || valueID == CSSValueNone)
            return true;
        break;
    case CSSPropertyWebkitTransformStyle:
        if (valueID == CSSValueFlat || valueID == CSSValuePreserve3d)
            return true;
        break;
    case CSSPropertyWebkitUserDrag: // auto | none | element
        if (valueID == CSSValueAuto || valueID == CSSValueNone || valueID == CSSValueElement)
            return true;
        break;
    case CSSPropertyWebkitUserModify: // read-only | read-write
        if (valueID == CSSValueReadOnly || valueID == CSSValueReadWrite || valueID == CSSValueReadWritePlaintextOnly)
            return true;
        break;
    case CSSPropertyWebkitUserSelect: // auto | none | text
        if (valueID == CSSValueAuto || valueID == CSSValueNone || valueID == CSSValueText)
            return true;
        break;
#if ENABLE(CSS_EXCLUSIONS)
    case CSSPropertyWebkitWrapFlow:
        if (!RuntimeEnabledFeatures::cssExclusionsEnabled())
            return false;
        if (valueID == CSSValueAuto || valueID == CSSValueBoth || valueID == CSSValueStart || valueID == CSSValueEnd || valueID == CSSValueMaximum || valueID == CSSValueClear)
            return true;
        break;
    case CSSPropertyWebkitWrapThrough:
        if (!RuntimeEnabledFeatures::cssExclusionsEnabled())
            return false;
        if (valueID == CSSValueWrap || valueID == CSSValueNone)
            return true;
        break;
#endif
    case CSSPropertyWebkitWritingMode:
        if (valueID >= CSSValueHorizontalTb && valueID <= CSSValueHorizontalBt)
            return true;
        break;
    case CSSPropertyWhiteSpace: // normal | pre | nowrap | inherit
        if (valueID == CSSValueNormal || valueID == CSSValuePre || valueID == CSSValuePreWrap || valueID == CSSValuePreLine || valueID == CSSValueNowrap)
            return true;
        break;
    case CSSPropertyWordBreak: // normal | break-all | break-word (this is a custom extension)
        if (valueID == CSSValueNormal || valueID == CSSValueBreakAll || valueID == CSSValueBreakWord)
            return true;
        break;
    case CSSPropertyWordWrap: // normal | break-word
        if (valueID == CSSValueNormal || valueID == CSSValueBreakWord)
            return true;
        break;
    default:
        ASSERT_NOT_REACHED();
        return false;
    }
    return false;
}

static inline bool isKeywordPropertyID(CSSPropertyID propertyId)
{
    switch (propertyId) {
    case CSSPropertyBorderBottomStyle:
    case CSSPropertyBorderCollapse:
    case CSSPropertyBorderLeftStyle:
    case CSSPropertyBorderRightStyle:
    case CSSPropertyBorderTopStyle:
    case CSSPropertyBoxSizing:
    case CSSPropertyCaptionSide:
    case CSSPropertyClear:
    case CSSPropertyDirection:
    case CSSPropertyDisplay:
    case CSSPropertyEmptyCells:
    case CSSPropertyFloat:
    case CSSPropertyFontStyle:
    case CSSPropertyImageRendering:
    case CSSPropertyListStylePosition:
    case CSSPropertyListStyleType:
    case CSSPropertyOutlineStyle:
    case CSSPropertyOverflowX:
    case CSSPropertyOverflowY:
    case CSSPropertyPageBreakAfter:
    case CSSPropertyPageBreakBefore:
    case CSSPropertyPageBreakInside:
    case CSSPropertyPointerEvents:
    case CSSPropertyPosition:
    case CSSPropertyResize:
    case CSSPropertySpeak:
    case CSSPropertyTableLayout:
    case CSSPropertyTextLineThroughMode:
    case CSSPropertyTextLineThroughStyle:
    case CSSPropertyTextOverflow:
    case CSSPropertyTextOverlineMode:
    case CSSPropertyTextOverlineStyle:
    case CSSPropertyTextRendering:
    case CSSPropertyTextTransform:
    case CSSPropertyTextUnderlineMode:
    case CSSPropertyTextUnderlineStyle:
    case CSSPropertyVisibility:
    case CSSPropertyWebkitAppearance:
    case CSSPropertyWebkitBackfaceVisibility:
    case CSSPropertyWebkitBorderAfterStyle:
    case CSSPropertyWebkitBorderBeforeStyle:
    case CSSPropertyWebkitBorderEndStyle:
    case CSSPropertyWebkitBorderFit:
    case CSSPropertyWebkitBorderStartStyle:
    case CSSPropertyWebkitBoxAlign:
#if ENABLE(CSS_BOX_DECORATION_BREAK)
    case CSSPropertyWebkitBoxDecorationBreak:
#endif
    case CSSPropertyWebkitBoxDirection:
    case CSSPropertyWebkitBoxLines:
    case CSSPropertyWebkitBoxOrient:
    case CSSPropertyWebkitBoxPack:
    case CSSPropertyWebkitColorCorrection:
    case CSSPropertyWebkitColumnBreakAfter:
    case CSSPropertyWebkitColumnBreakBefore:
    case CSSPropertyWebkitColumnBreakInside:
    case CSSPropertyWebkitColumnRuleStyle:
#if ENABLE(CSS3_FLEXBOX)
    case CSSPropertyWebkitAlignContent:
    case CSSPropertyWebkitAlignItems:
    case CSSPropertyWebkitAlignSelf:
    case CSSPropertyWebkitFlexDirection:
    case CSSPropertyWebkitFlexWrap:
    case CSSPropertyWebkitJustifyContent:
#endif
    case CSSPropertyWebkitFontKerning:
    case CSSPropertyWebkitFontSmoothing:
    case CSSPropertyWebkitHyphens:
    case CSSPropertyWebkitLineAlign:
    case CSSPropertyWebkitLineBreak:
    case CSSPropertyWebkitLineSnap:
    case CSSPropertyWebkitMarginAfterCollapse:
    case CSSPropertyWebkitMarginBeforeCollapse:
    case CSSPropertyWebkitMarginBottomCollapse:
    case CSSPropertyWebkitMarginTopCollapse:
    case CSSPropertyWebkitMarqueeDirection:
    case CSSPropertyWebkitMarqueeStyle:
    case CSSPropertyWebkitNbspMode:
#if ENABLE(OVERFLOW_SCROLLING)
    case CSSPropertyWebkitOverflowScrolling:
#endif
    case CSSPropertyWebkitPrintColorAdjust:
#if ENABLE(CSS_REGIONS)
    case CSSPropertyWebkitRegionBreakAfter:
    case CSSPropertyWebkitRegionBreakBefore:
    case CSSPropertyWebkitRegionBreakInside:
    case CSSPropertyWebkitRegionOverflow:
#endif
    case CSSPropertyWebkitRtlOrdering:
    case CSSPropertyWebkitTextCombine:
    case CSSPropertyWebkitTextEmphasisPosition:
    case CSSPropertyWebkitTextSecurity:
    case CSSPropertyWebkitTextSizeAdjust:
    case CSSPropertyWebkitTransformStyle:
    case CSSPropertyWebkitUserDrag:
    case CSSPropertyWebkitUserModify:
    case CSSPropertyWebkitUserSelect:
#if ENABLE(CSS_EXCLUSIONS)
    case CSSPropertyWebkitWrapFlow:
    case CSSPropertyWebkitWrapThrough:
#endif
    case CSSPropertyWebkitWritingMode:
    case CSSPropertyWhiteSpace:
    case CSSPropertyWordBreak:
    case CSSPropertyWordWrap:
        return true;
    default:
        return false;
    }
}

static bool parseKeywordValue(StylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, const CSSParserContext& parserContext)
{
    ASSERT(!string.isEmpty());

    if (!isKeywordPropertyID(propertyId))
        return false;

    CSSParserString cssString;
    cssString.characters = const_cast<UChar*>(string.characters());
    cssString.length = string.length();
    int valueID = cssValueKeywordID(cssString);

    if (!valueID)
        return false;

    RefPtr<CSSValue> value;
    if (valueID == CSSValueInherit)
        value = cssValuePool().createInheritedValue();
    else if (valueID == CSSValueInitial)
        value = cssValuePool().createExplicitInitialValue();
    else if (isValidKeywordPropertyAndValue(propertyId, valueID, parserContext))
        value = cssValuePool().createIdentifierValue(valueID);
    else
        return false;

    declaration->addParsedProperty(CSSProperty(propertyId, value.release(), important));
    return true;
}

template <typename CharType>
static bool parseTransformArguments(WebKitCSSTransformValue* transformValue, CharType* characters, unsigned length, unsigned start, unsigned expectedCount)
{
    while (expectedCount) {
        size_t end = WTF::find(characters, length, expectedCount == 1 ? ')' : ',', start);
        if (end == notFound || (expectedCount == 1 && end != length - 1))
            return false;
        unsigned argumentLength = end - start;
        CSSPrimitiveValue::UnitTypes unit = CSSPrimitiveValue::CSS_NUMBER;
        double number;
        if (!parseSimpleLength(characters + start, argumentLength, unit, number))
            return false;
        if (unit != CSSPrimitiveValue::CSS_PX && (number || unit != CSSPrimitiveValue::CSS_NUMBER))
            return false;
        transformValue->append(cssValuePool().createValue(number, unit));
        start = end + 1;
        --expectedCount;
    }
    return true;
}

static bool parseTransformValue(StylePropertySet* properties, CSSPropertyID propertyID, const String& string, bool important)
{
    if (propertyID != CSSPropertyWebkitTransform)
        return false;
    static const unsigned shortestValidTransformStringLength = 12;
    static const unsigned likelyMultipartTransformStringLengthCutoff = 32;
    if (string.length() < shortestValidTransformStringLength || string.length() > likelyMultipartTransformStringLengthCutoff)
        return false;
    if (!string.startsWith("translate", false))
        return false;
    UChar c9 = toASCIILower(string[9]);
    UChar c10 = toASCIILower(string[10]);

    WebKitCSSTransformValue::TransformOperationType transformType;
    unsigned expectedArgumentCount = 1;
    unsigned argumentStart = 11;
    if (c9 == 'x' && c10 == '(')
        transformType = WebKitCSSTransformValue::TranslateXTransformOperation;
    else if (c9 == 'y' && c10 == '(')
        transformType = WebKitCSSTransformValue::TranslateYTransformOperation;
    else if (c9 == 'z' && c10 == '(')
        transformType = WebKitCSSTransformValue::TranslateZTransformOperation;
    else if (c9 == '(') {
        transformType = WebKitCSSTransformValue::TranslateTransformOperation;
        expectedArgumentCount = 2;
        argumentStart = 10;
    } else if (c9 == '3' && c10 == 'd' && string[11] == '(') {
        transformType = WebKitCSSTransformValue::Translate3DTransformOperation;
        expectedArgumentCount = 3;
        argumentStart = 12;
    } else
        return false;

    RefPtr<WebKitCSSTransformValue> transformValue = WebKitCSSTransformValue::create(transformType);
    bool success;
    if (string.is8Bit())
        success = parseTransformArguments(transformValue.get(), string.characters8(), string.length(), argumentStart, expectedArgumentCount);
    else
        success = parseTransformArguments(transformValue.get(), string.characters16(), string.length(), argumentStart, expectedArgumentCount);
    if (!success)
        return false;
    RefPtr<CSSValueList> result = CSSValueList::createSpaceSeparated();
    result->append(transformValue.release());
    properties->addParsedProperty(CSSProperty(CSSPropertyWebkitTransform, result.release(), important));
    return true;
}

PassRefPtr<CSSValueList> CSSParser::parseFontFaceValue(const AtomicString& string)
{
    if (string.isEmpty())
        return 0;
    RefPtr<StylePropertySet> dummyStyle = StylePropertySet::create();
    if (!parseValue(dummyStyle.get(), CSSPropertyFontFamily, string, false, CSSQuirksMode, 0))
        return 0;
    return static_pointer_cast<CSSValueList>(dummyStyle->getPropertyCSSValue(CSSPropertyFontFamily));
}

#if ENABLE(CSS_VARIABLES)
bool CSSParser::parseValue(StylePropertySet* declaration, CSSPropertyID propertyID, const String& string, bool important, Document* document)
{
    ASSERT(!string.isEmpty());

    CSSParserContext context(document);

    if (parseSimpleLengthValue(declaration, propertyID, string, important, context.mode))
        return true;
    if (parseColorValue(declaration, propertyID, string, important, context.mode))
        return true;
    if (parseKeywordValue(declaration, propertyID, string, important, context))
        return true;

    CSSParser parser(context);
    return parser.parseValue(declaration, propertyID, string, important, static_cast<StyleSheetContents*>(0));
}
#endif

bool CSSParser::parseValue(StylePropertySet* declaration, CSSPropertyID propertyID, const String& string, bool important, CSSParserMode cssParserMode, StyleSheetContents* contextStyleSheet)
{
    ASSERT(!string.isEmpty());
    if (parseSimpleLengthValue(declaration, propertyID, string, important, cssParserMode))
        return true;
    if (parseColorValue(declaration, propertyID, string, important, cssParserMode))
        return true;
    if (parseKeywordValue(declaration, propertyID, string, important, contextStyleSheet->parserContext()))
        return true;
    if (parseTransformValue(declaration, propertyID, string, important))
        return true;

    CSSParserContext context(cssParserMode);
    if (contextStyleSheet) {
        context = contextStyleSheet->parserContext();
        context.mode = cssParserMode;
    }
    CSSParser parser(context);
    return parser.parseValue(declaration, propertyID, string, important, contextStyleSheet);
}

bool CSSParser::parseValue(StylePropertySet* declaration, CSSPropertyID propertyID, const String& string, bool important, StyleSheetContents* contextStyleSheet)
{
    setStyleSheet(contextStyleSheet);

    setupParser("@-webkit-value{", string, "} ");

    m_id = propertyID;
    m_important = important;

    cssyyparse(this);

    m_rule = 0;

    bool ok = false;
    if (m_hasFontFaceOnlyValues)
        deleteFontFaceOnlyValues();
    if (!m_parsedProperties.isEmpty()) {
        ok = true;
        declaration->addParsedProperties(m_parsedProperties);
        clearProperties();
    }

    return ok;
}

// The color will only be changed when string contains a valid CSS color, so callers
// can set it to a default color and ignore the boolean result.
bool CSSParser::parseColor(RGBA32& color, const String& string, bool strict)
{
    // First try creating a color specified by name, rgba(), rgb() or "#" syntax.
    if (fastParseColor(color, string, strict))
        return true;

    CSSParser parser(CSSStrictMode);

    // In case the fast-path parser didn't understand the color, try the full parser.
    if (!parser.parseColor(string))
        return false;

    CSSValue* value = parser.m_parsedProperties.first().value();
    if (!value->isPrimitiveValue())
        return false;

    CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
    if (!primitiveValue->isRGBColor())
        return false;

    color = primitiveValue->getRGBA32Value();
    return true;
}

bool CSSParser::parseColor(const String& string)
{
    setupParser("@-webkit-decls{color:", string, "} ");
    cssyyparse(this);
    m_rule = 0;

    return !m_parsedProperties.isEmpty() && m_parsedProperties.first().id() == CSSPropertyColor;
}

bool CSSParser::parseSystemColor(RGBA32& color, const String& string, Document* document)
{
    if (!document || !document->page())
        return false;

    CSSParserString cssColor;
    cssColor.characters = const_cast<UChar*>(string.characters());
    cssColor.length = string.length();
    int id = cssValueKeywordID(cssColor);
    if (id <= 0)
        return false;

    color = document->page()->theme()->systemColor(id).rgb();
    return true;
}

void CSSParser::parseSelector(const String& string, CSSSelectorList& selectorList)
{
    m_selectorListForParseSelector = &selectorList;

    setupParser("@-webkit-selector{", string, "}");

    cssyyparse(this);

    m_selectorListForParseSelector = 0;
}

bool CSSParser::parseDeclaration(StylePropertySet* declaration, const String& string, PassRefPtr<CSSRuleSourceData> prpRuleSourceData, StyleSheetContents* contextStyleSheet)
{
    // Length of the "@-webkit-decls{" prefix.
    static const unsigned prefixLength = 15;

    setStyleSheet(contextStyleSheet);

    RefPtr<CSSRuleSourceData> ruleSourceData = prpRuleSourceData;
    if (ruleSourceData) {
        m_currentRuleDataStack = adoptPtr(new RuleSourceDataList());
        m_currentRuleDataStack->append(ruleSourceData);
    }

    setupParser("@-webkit-decls{", string, "} ");
    cssyyparse(this);
    m_rule = 0;

    bool ok = false;
    if (m_hasFontFaceOnlyValues)
        deleteFontFaceOnlyValues();
    if (!m_parsedProperties.isEmpty()) {
        ok = true;
        declaration->addParsedProperties(m_parsedProperties);
        clearProperties();
    }

    if (ruleSourceData) {
        ASSERT(m_currentRuleDataStack->size() == 1);
        ruleSourceData->ruleBodyRange.start = 0;
        ruleSourceData->ruleBodyRange.end = string.length();
        for (size_t i = 0, size = ruleSourceData->styleSourceData->propertyData.size(); i < size; ++i) {
            CSSPropertySourceData& propertyData = ruleSourceData->styleSourceData->propertyData.at(i);
            propertyData.range.start -= prefixLength;
            propertyData.range.end -= prefixLength;
        }

        fixUnparsedPropertyRanges(ruleSourceData.get());
        m_currentRuleDataStack.clear();
    }

    return ok;
}

PassOwnPtr<MediaQuery> CSSParser::parseMediaQuery(const String& string)
{
    if (string.isEmpty())
        return nullptr;

    ASSERT(!m_mediaQuery);

    // can't use { because tokenizer state switches from mediaquery to initial state when it sees { token.
    // instead insert one " " (which is WHITESPACE in CSSGrammar.y)
    setupParser("@-webkit-mediaquery ", string, "} ");
    cssyyparse(this);

    return m_mediaQuery.release();
}

#if ENABLE(CSS_VARIABLES)
static inline void filterProperties(bool important, const CSSParser::ParsedPropertyVector& input, Vector<CSSProperty, 256>& output, size_t& unusedEntries, BitArray<numCSSProperties>& seenProperties, HashSet<AtomicString>& seenVariables)
#else
static inline void filterProperties(bool important, const CSSParser::ParsedPropertyVector& input, Vector<CSSProperty, 256>& output, size_t& unusedEntries, BitArray<numCSSProperties>& seenProperties)
#endif
{
    // Add properties in reverse order so that highest priority definitions are reached first. Duplicate definitions can then be ignored when found.
    for (int i = input.size() - 1; i >= 0; --i) {
        const CSSProperty& property = input[i];
        if (property.isImportant() != important)
            continue;
#if ENABLE(CSS_VARIABLES)
        if (property.id() == CSSPropertyVariable) {
            const AtomicString& name = static_cast<CSSVariableValue*>(property.value())->name();
            if (seenVariables.contains(name))
                continue;
            seenVariables.add(name);
            output[--unusedEntries] = property;
            continue;
        }
#endif
        const unsigned propertyIDIndex = property.id() - firstCSSProperty;
        if (seenProperties.get(propertyIDIndex))
            continue;
        …