root/Source/core/css/parser/BisonCSSParser-in.cpp

DEFINITIONS

1. m_tokenizer
2. setupParser
3. parseSheet
4. parseRule
5. parseKeyframeRule
6. parseKeyframeKeyList
7. parseSupportsCondition
8. isColorPropertyID
9. parseColorValue
10. isSimpleLengthPropertyID
11. parseSimpleLength
12. parseSimpleLengthValue
13. isValidKeywordPropertyAndValue
14. isKeywordPropertyID
15. parseKeywordValue
16. parseTransformTranslateArguments
17. parseTranslateTransformValue
18. parseTranslateTransformList
19. parseTranslateTransform
20. parseFontFaceValue
21. parseAnimationTimingFunctionValue
22. parseValue
23. parseValue
24. parseValue
25. parseColor
26. parseColor
27. parseSystemColor
28. parseSelector
29. parseInlineStyleDeclaration
30. parseDeclaration
31. parseDeclaration
32. parseMediaQueryList
33. filterProperties
34. createStylePropertySet
35. rollbackLastProperties
36. clearProperties
37. setCurrentProperty
38. parseValue
39. m_unit
40. type
41. argCount
42. unit
43. unknown
44. hasCorrectArgCount
45. parseTransform
46. parseTransformValue
47. ensureLineEndings
48. createFloatingSelectorWithTagName
49. createFloatingSelector
50. sinkFloatingSelector
51. createFloatingSelectorVector
52. sinkFloatingSelectorVector
53. createFloatingValueList
54. sinkFloatingValueList
55. createFloatingFunction
56. createFloatingFunction
57. sinkFloatingFunction
58. sinkFloatingValue
59. createFloatingMediaQueryExp
60. sinkFloatingMediaQueryExp
61. createFloatingMediaQueryExpList
62. sinkFloatingMediaQueryExpList
63. createFloatingMediaQuery
64. createFloatingMediaQuery
65. createFloatingNotAllQuery
66. sinkFloatingMediaQuery
67. createFloatingKeyframeVector
68. sinkFloatingKeyframeVector
69. createMediaQuerySet
70. createImportRule
71. createMediaRule
72. createSupportsRule
73. markSupportsRuleHeaderStart
74. markSupportsRuleHeaderEnd
75. popSupportsRuleData
76. createRuleList
77. appendRule
78. makeLower
79. tokenToLowerCase
80. endInvalidRuleHeader
81. reportError
82. isLoggingErrors
83. logError
84. createKeyframesRule
85. createStyleRule
86. createFontFaceRule
87. addNamespace
88. determineNameInNamespace
89. rewriteSpecifiersWithNamespaceIfNeeded
90. rewriteSpecifiersWithElementName
91. rewriteSpecifiersWithElementNameForCustomPseudoElement
92. rewriteSpecifiersWithElementNameForContentPseudoElement
93. rewriteSpecifiers
94. createPageRule
95. createMarginAtRule
96. startDeclarationsForMarginBox
97. endDeclarationsForMarginBox
98. deleteFontFaceOnlyValues
99. createKeyframe
100. invalidBlockHit
101. startRule
102. endRule
103. startRuleHeader
104. endRuleHeader
105. startSelector
106. endSelector
107. startRuleBody
108. startProperty
109. endProperty
110. startEndUnknownRule
111. createViewportRule

/*
 * 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.
 * Copyright (C) 2012 Intel Corporation. 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 "core/css/parser/BisonCSSParser.h"

#include "CSSValueKeywords.h"
#include "RuntimeEnabledFeatures.h"
#include "StylePropertyShorthand.h"
#include "core/css/CSSArrayFunctionValue.h"
#include "core/css/CSSAspectRatioValue.h"
#include "core/css/CSSBasicShapes.h"
#include "core/css/CSSBorderImage.h"
#include "core/css/CSSCanvasValue.h"
#include "core/css/CSSCrossfadeValue.h"
#include "core/css/CSSCursorImageValue.h"
#include "core/css/CSSFontFaceSrcValue.h"
#include "core/css/CSSFontFeatureValue.h"
#include "core/css/CSSFunctionValue.h"
#include "core/css/CSSGradientValue.h"
#include "core/css/CSSGridLineNamesValue.h"
#include "core/css/CSSGridTemplateAreasValue.h"
#include "core/css/CSSImageSetValue.h"
#include "core/css/CSSImageValue.h"
#include "core/css/CSSInheritedValue.h"
#include "core/css/CSSInitialValue.h"
#include "core/css/CSSKeyframeRule.h"
#include "core/css/CSSKeyframesRule.h"
#include "core/css/CSSLineBoxContainValue.h"
#include "core/css/CSSPrimitiveValue.h"
#include "core/css/CSSPropertySourceData.h"
#include "core/css/CSSReflectValue.h"
#include "core/css/CSSSVGDocumentValue.h"
#include "core/css/CSSSelector.h"
#include "core/css/CSSShadowValue.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/CSSTimingFunctionValue.h"
#include "core/css/CSSTransformValue.h"
#include "core/css/CSSUnicodeRangeValue.h"
#include "core/css/CSSValueList.h"
#include "core/css/CSSValuePool.h"
#include "core/css/Counter.h"
#include "core/css/HashTools.h"
#include "core/css/MediaList.h"
#include "core/css/MediaQueryExp.h"
#include "core/css/Pair.h"
#include "core/css/Rect.h"
#include "core/css/StylePropertySet.h"
#include "core/css/StyleRule.h"
#include "core/css/StyleRuleImport.h"
#include "core/css/StyleSheetContents.h"
#include "core/css/parser/CSSParserIdioms.h"
#include "core/dom/Document.h"
#include "core/frame/FrameHost.h"
#include "core/frame/PageConsole.h"
#include "core/frame/Settings.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/rendering/RenderTheme.h"
#include "core/svg/SVGParserUtilities.h"
#include "platform/FloatConversion.h"
#include "wtf/BitArray.h"
#include "wtf/HexNumber.h"
#include "wtf/text/StringBuffer.h"
#include "wtf/text/StringBuilder.h"
#include "wtf/text/StringImpl.h"
#include "wtf/text/TextEncoding.h"
#include <limits.h>

#define YYDEBUG 0

#if YYDEBUG > 0
extern int cssyydebug;
#endif

int cssyyparse(WebCore::BisonCSSParser*);

using namespace std;
using namespace WTF;

namespace WebCore {

static const unsigned INVALID_NUM_PARSED_PROPERTIES = UINT_MAX;

BisonCSSParser::BisonCSSParser(const CSSParserContext& context)
    : m_context(context)
    , m_important(false)
    , m_id(CSSPropertyInvalid)
    , m_styleSheet(nullptr)
    , m_supportsCondition(false)
    , m_selectorListForParseSelector(0)
    , m_numParsedPropertiesBeforeMarginBox(INVALID_NUM_PARSED_PROPERTIES)
    , m_hasFontFaceOnlyValues(false)
    , m_hadSyntacticallyValidCSSRule(false)
    , m_logErrors(false)
    , m_ignoreErrors(false)
    , m_defaultNamespace(starAtom)
    , m_observer(0)
    , m_source(0)
    , m_ruleHeaderType(CSSRuleSourceData::UNKNOWN_RULE)
    , m_allowImportRules(true)
    , m_allowNamespaceDeclarations(true)
    , m_inViewport(false)
    , m_tokenizer(*this)
{
#if YYDEBUG > 0
    cssyydebug = 1;
#endif
}

BisonCSSParser::~BisonCSSParser()
{
    clearProperties();

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

void BisonCSSParser::setupParser(const char* prefix, unsigned prefixLength, const String& string, const char* suffix, unsigned suffixLength)
{
    m_tokenizer.setupTokenizer(prefix, prefixLength, string, suffix, suffixLength);
    m_ruleHasHeader = true;
}

void BisonCSSParser::parseSheet(StyleSheetContents* sheet, const String& string, const TextPosition& startPosition, CSSParserObserver* observer, bool logErrors)
{
    setStyleSheet(sheet);
    m_defaultNamespace = starAtom; // Reset the default namespace.
    TemporaryChange<CSSParserObserver*> scopedObsever(m_observer, observer);
    m_logErrors = logErrors && sheet->singleOwnerDocument() && !sheet->baseURL().isEmpty() && sheet->singleOwnerDocument()->frameHost();
    m_ignoreErrors = false;
    m_tokenizer.m_lineNumber = 0;
    m_startPosition = startPosition;
    m_source = &string;
    m_tokenizer.m_internal = false;
    setupParser("", string, "");
    cssyyparse(this);
    sheet->shrinkToFit();
    m_source = 0;
    m_rule = nullptr;
    m_lineEndings.clear();
    m_ignoreErrors = false;
    m_logErrors = false;
    m_tokenizer.m_internal = true;
}

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

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

PassOwnPtr<Vector<double> > BisonCSSParser::parseKeyframeKeyList(const String& string)
{
    setupParser("@-internal-keyframe-key-list ", string, "");
    cssyyparse(this);
    ASSERT(m_valueList);
    return StyleKeyframe::createKeyList(m_valueList.get());
}

bool BisonCSSParser::parseSupportsCondition(const String& string)
{
    m_supportsCondition = false;
    setupParser("@-internal-supports-condition ", string, "");
    cssyyparse(this);
    return m_supportsCondition;
}

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;
    case CSSPropertyTextDecorationColor:
        return RuntimeEnabledFeatures::css3TextDecorationsEnabled();
    default:
        return false;
    }
}

static bool parseColorValue(MutableStylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, CSSParserMode cssParserMode)
{
    ASSERT(!string.isEmpty());
    bool quirksMode = isQuirksModeBehavior(cssParserMode);
    if (!isColorPropertyID(propertyId))
        return false;
    CSSParserString cssString;
    cssString.init(string);
    CSSValueID 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
        || (quirksMode && valueID >= CSSValueWebkitFocusRingColor && valueID < CSSValueWebkitText)) {
        validPrimitive = true;
    }

    if (validPrimitive) {
        RefPtrWillBeRawPtr<CSSValue> value = cssValuePool().createIdentifierValue(valueID);
        declaration->addParsedProperty(CSSProperty(propertyId, value.release(), important));
        return true;
    }
    RGBA32 color;
    if (!CSSPropertyParser::fastParseColor(color, string, !quirksMode && string[0] != '#'))
        return false;
    RefPtrWillBeRawPtr<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;
    case CSSPropertyShapeMargin:
        acceptsNegativeNumbers = false;
        return RuntimeEnabledFeatures::cssShapesEnabled();
    case CSSPropertyBottom:
    case CSSPropertyLeft:
    case CSSPropertyMarginBottom:
    case CSSPropertyMarginLeft:
    case CSSPropertyMarginRight:
    case CSSPropertyMarginTop:
    case CSSPropertyRight:
    case CSSPropertyTop:
    case CSSPropertyWebkitMarginAfter:
    case CSSPropertyWebkitMarginBefore:
    case CSSPropertyWebkitMarginEnd:
    case CSSPropertyWebkitMarginStart:
        acceptsNegativeNumbers = true;
        return true;
    default:
        return false;
    }
}

template <typename CharacterType>
static inline bool parseSimpleLength(const CharacterType* 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(MutableStylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, CSSParserMode cssParserMode)
{
    ASSERT(!string.isEmpty());
    bool acceptsNegativeNumbers = false;

    // In @viewport, width and height are shorthands, not simple length values.
    if (isCSSViewportParsingEnabledForMode(cssParserMode) || !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) {
        bool quirksMode = isQuirksModeBehavior(cssParserMode);
        if (number && !quirksMode)
            return false;
        unit = CSSPrimitiveValue::CSS_PX;
    }
    if (number < 0 && !acceptsNegativeNumbers)
        return false;

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

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 | 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
        // flex | inline-flex | -webkit-flex | -webkit-inline-flex | grid | inline-grid | lazy-block
        if ((valueID >= CSSValueInline && valueID <= CSSValueInlineFlex) || valueID == CSSValueWebkitFlex || valueID == CSSValueWebkitInlineFlex || valueID == CSSValueNone)
            return true;
        if (valueID == CSSValueGrid || valueID == CSSValueInlineGrid)
            return RuntimeEnabledFeatures::cssGridLayoutEnabled();
        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 CSSPropertyIsolation: // auto | isolate
        if (valueID == CSSValueAuto || valueID == CSSValueIsolate)
            return RuntimeEnabledFeatures::cssCompositingEnabled();
        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 CSSPropertyObjectFit:
        if (RuntimeEnabledFeatures::objectFitPositionEnabled()) {
            if (valueID == CSSValueFill || valueID == CSSValueContain || valueID == CSSValueCover || valueID == CSSValueNone || valueID == CSSValueScaleDown)
                return true;
        }
        break;
    case CSSPropertyOutlineStyle: // (<border-style> except hidden) | auto | inherit
        if (valueID == CSSValueAuto || valueID == CSSValueNone || (valueID >= CSSValueInset && valueID <= CSSValueDouble))
            return true;
        break;
    case CSSPropertyOverflowWrap: // normal | break-word
    case CSSPropertyWordWrap:
        if (valueID == CSSValueNormal || valueID == CSSValueBreakWord)
            return true;
        break;
    case CSSPropertyOverflowX: // visible | hidden | scroll | auto | overlay | inherit
        if (valueID == CSSValueVisible || valueID == CSSValueHidden || valueID == CSSValueScroll || valueID == CSSValueAuto || valueID == CSSValueOverlay)
            return true;
        break;
    case CSSPropertyOverflowY: // visible | hidden | scroll | auto | overlay | inherit | -webkit-paged-x | -webkit-paged-y
        if (valueID == CSSValueVisible || valueID == CSSValueHidden || valueID == CSSValueScroll || valueID == CSSValueAuto || valueID == CSSValueOverlay || valueID == CSSValueWebkitPagedX || valueID == CSSValueWebkitPagedY)
            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 | bounding-box | inherit
        if (valueID == CSSValueVisible || valueID == CSSValueNone || valueID == CSSValueAll || valueID == CSSValueAuto || (valueID >= CSSValueVisiblepainted && valueID <= CSSValueBoundingBox))
            return true;
        break;
    case CSSPropertyPosition: // static | relative | absolute | fixed | sticky | inherit
        if (valueID == CSSValueStatic || valueID == CSSValueRelative || valueID == CSSValueAbsolute || valueID == CSSValueFixed
            || (RuntimeEnabledFeatures::cssStickyPositionEnabled() && valueID == CSSValueSticky))
            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 CSSPropertyScrollBehavior: // instant | smooth
        if (valueID == CSSValueInstant || valueID == CSSValueSmooth)
            return RuntimeEnabledFeatures::cssomSmoothScrollEnabled();
    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 CSSPropertyTextAlignLast:
        // auto | start | end | left | right | center | justify
        if (RuntimeEnabledFeatures::css3TextEnabled()
            && ((valueID >= CSSValueLeft && valueID <= CSSValueJustify) || valueID == CSSValueStart || valueID == CSSValueEnd || valueID == CSSValueAuto))
            return true;
        break;
    case CSSPropertyTextJustify:
        // auto | none | inter-word | distribute
        if (RuntimeEnabledFeatures::css3TextEnabled()
            && (valueID == CSSValueInterWord || valueID == CSSValueDistribute || valueID == CSSValueAuto || valueID == CSSValueNone))
            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 CSSPropertyTouchActionDelay: // none | script
        if (RuntimeEnabledFeatures::cssTouchActionDelayEnabled() && (valueID == CSSValueScript || 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 CSSPropertyBackfaceVisibility:
    case CSSPropertyWebkitBackfaceVisibility:
        if (valueID == CSSValueVisible || valueID == CSSValueHidden)
            return true;
        break;
    case CSSPropertyMixBlendMode:
        if (RuntimeEnabledFeatures::cssCompositingEnabled() && (valueID == CSSValueNormal || valueID == CSSValueMultiply || valueID == CSSValueScreen
            || valueID == CSSValueOverlay || valueID == CSSValueDarken || valueID == CSSValueLighten ||  valueID == CSSValueColorDodge
            || valueID == CSSValueColorBurn || valueID == CSSValueHardLight || valueID == CSSValueSoftLight || valueID == CSSValueDifference
            || valueID == CSSValueExclusion || valueID == CSSValueHue || valueID == CSSValueSaturation || valueID == CSSValueColor
            || valueID == CSSValueLuminosity))
            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;
    case CSSPropertyWebkitBoxDecorationBreak:
         if (valueID == CSSValueClone || valueID == CSSValueSlice)
             return true;
         break;
    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 CSSPropertyInternalCallback:
        // This property is only injected programmatically, not parsed from stylesheets.
        return false;
    case CSSPropertyColumnFill:
        if (RuntimeEnabledFeatures::regionBasedColumnsEnabled()) {
            if (valueID == CSSValueAuto || valueID == CSSValueBalance)
                return true;
        }
        break;
    case CSSPropertyAlignContent:
        // FIXME: Per CSS alignment, this property should accept an optional <overflow-position>. We should share this parsing code with 'justify-self'.
         if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueSpaceBetween || valueID == CSSValueSpaceAround || valueID == CSSValueStretch)
             return true;
         break;
    case CSSPropertyAlignItems:
        // FIXME: Per CSS alignment, this property should accept the same arguments as 'justify-self' so we should share its parsing code.
        if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch)
            return true;
        break;
    case CSSPropertyAlignSelf:
        // FIXME: Per CSS alignment, this property should accept the same arguments as 'justify-self' so we should share its parsing code.
        if (valueID == CSSValueAuto || valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch)
            return true;
        break;
    case CSSPropertyFlexDirection:
        if (valueID == CSSValueRow || valueID == CSSValueRowReverse || valueID == CSSValueColumn || valueID == CSSValueColumnReverse)
            return true;
        break;
    case CSSPropertyFlexWrap:
        if (valueID == CSSValueNowrap || valueID == CSSValueWrap || valueID == CSSValueWrapReverse)
             return true;
        break;
    case CSSPropertyJustifyContent:
        // FIXME: Per CSS alignment, this property should accept an optional <overflow-position>. We should share this parsing code with 'justify-self'.
        if (valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueSpaceBetween || valueID == CSSValueSpaceAround)
            return true;
        break;
    case CSSPropertyFontKerning:
        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 CSSPropertyGridAutoFlow:
        if (valueID == CSSValueNone || valueID == CSSValueRow || valueID == CSSValueColumn)
            return RuntimeEnabledFeatures::cssGridLayoutEnabled();
        break;
    case CSSPropertyWebkitLineBreak: // auto | loose | normal | strict | after-white-space
        if (valueID == CSSValueAuto || valueID == CSSValueLoose || valueID == CSSValueNormal || valueID == CSSValueStrict || valueID == CSSValueAfterWhiteSpace)
            return true;
        break;
    case CSSPropertyWebkitMarginAfterCollapse:
    case CSSPropertyWebkitMarginBeforeCollapse:
    case CSSPropertyWebkitMarginBottomCollapse:
    case CSSPropertyWebkitMarginTopCollapse:
        if (valueID == CSSValueCollapse || valueID == CSSValueSeparate || valueID == CSSValueDiscard)
            return true;
        break;
    case CSSPropertyInternalMarqueeDirection:
        if (valueID == CSSValueForwards || valueID == CSSValueBackwards || valueID == CSSValueAhead || valueID == CSSValueReverse || valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueDown
            || valueID == CSSValueUp || valueID == CSSValueAuto)
            return true;
        break;
    case CSSPropertyInternalMarqueeStyle:
        if (valueID == CSSValueNone || valueID == CSSValueSlide || valueID == CSSValueScroll || valueID == CSSValueAlternate)
            return true;
        break;
    case CSSPropertyWebkitPrintColorAdjust:
        if (valueID == CSSValueExact || valueID == CSSValueEconomy)
            return true;
        break;
    case CSSPropertyWebkitRtlOrdering:
        if (valueID == CSSValueLogical || valueID == CSSValueVisual)
            return true;
        break;

    case CSSPropertyWebkitRubyPosition:
        if (valueID == CSSValueBefore || valueID == CSSValueAfter)
            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 CSSPropertyTransformStyle:
    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 | all
        if (valueID == CSSValueAuto || valueID == CSSValueNone || valueID == CSSValueText || valueID == CSSValueAll)
            return true;
        break;
    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;
    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;
    default:
        ASSERT_NOT_REACHED();
        return false;
    }
    return false;
}

bool isKeywordPropertyID(CSSPropertyID propertyId)
{
    switch (propertyId) {
    case CSSPropertyMixBlendMode:
    case CSSPropertyIsolation:
    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 CSSPropertyObjectFit:
    case CSSPropertyOutlineStyle:
    case CSSPropertyOverflowWrap:
    case CSSPropertyOverflowX:
    case CSSPropertyOverflowY:
    case CSSPropertyPageBreakAfter:
    case CSSPropertyPageBreakBefore:
    case CSSPropertyPageBreakInside:
    case CSSPropertyPointerEvents:
    case CSSPropertyPosition:
    case CSSPropertyResize:
    case CSSPropertyScrollBehavior:
    case CSSPropertySpeak:
    case CSSPropertyTableLayout:
    case CSSPropertyTextAlignLast:
    case CSSPropertyTextJustify:
    case CSSPropertyTextLineThroughMode:
    case CSSPropertyTextLineThroughStyle:
    case CSSPropertyTextOverflow:
    case CSSPropertyTextOverlineMode:
    case CSSPropertyTextOverlineStyle:
    case CSSPropertyTextRendering:
    case CSSPropertyTextTransform:
    case CSSPropertyTextUnderlineMode:
    case CSSPropertyTextUnderlineStyle:
    case CSSPropertyTouchActionDelay:
    case CSSPropertyVisibility:
    case CSSPropertyWebkitAppearance:
    case CSSPropertyBackfaceVisibility:
    case CSSPropertyWebkitBackfaceVisibility:
    case CSSPropertyWebkitBorderAfterStyle:
    case CSSPropertyWebkitBorderBeforeStyle:
    case CSSPropertyWebkitBorderEndStyle:
    case CSSPropertyWebkitBorderFit:
    case CSSPropertyWebkitBorderStartStyle:
    case CSSPropertyWebkitBoxAlign:
    case CSSPropertyWebkitBoxDecorationBreak:
    case CSSPropertyWebkitBoxDirection:
    case CSSPropertyWebkitBoxLines:
    case CSSPropertyWebkitBoxOrient:
    case CSSPropertyWebkitBoxPack:
    case CSSPropertyInternalCallback:
    case CSSPropertyWebkitColumnBreakAfter:
    case CSSPropertyWebkitColumnBreakBefore:
    case CSSPropertyWebkitColumnBreakInside:
    case CSSPropertyColumnFill:
    case CSSPropertyWebkitColumnRuleStyle:
    case CSSPropertyAlignContent:
    case CSSPropertyFlexDirection:
    case CSSPropertyFlexWrap:
    case CSSPropertyJustifyContent:
    case CSSPropertyFontKerning:
    case CSSPropertyWebkitFontSmoothing:
    case CSSPropertyGridAutoFlow:
    case CSSPropertyWebkitLineBreak:
    case CSSPropertyWebkitMarginAfterCollapse:
    case CSSPropertyWebkitMarginBeforeCollapse:
    case CSSPropertyWebkitMarginBottomCollapse:
    case CSSPropertyWebkitMarginTopCollapse:
    case CSSPropertyInternalMarqueeDirection:
    case CSSPropertyInternalMarqueeStyle:
    case CSSPropertyWebkitPrintColorAdjust:
    case CSSPropertyWebkitRtlOrdering:
    case CSSPropertyWebkitRubyPosition:
    case CSSPropertyWebkitTextCombine:
    case CSSPropertyWebkitTextEmphasisPosition:
    case CSSPropertyWebkitTextSecurity:
    case CSSPropertyTransformStyle:
    case CSSPropertyWebkitTransformStyle:
    case CSSPropertyWebkitUserDrag:
    case CSSPropertyWebkitUserModify:
    case CSSPropertyWebkitUserSelect:
    case CSSPropertyWebkitWrapFlow:
    case CSSPropertyWebkitWrapThrough:
    case CSSPropertyWebkitWritingMode:
    case CSSPropertyWhiteSpace:
    case CSSPropertyWordBreak:
    case CSSPropertyWordWrap:
        return true;
    case CSSPropertyAlignItems:
    case CSSPropertyAlignSelf:
        return !RuntimeEnabledFeatures::cssGridLayoutEnabled();
    default:
        return false;
    }
}

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

    if (!isKeywordPropertyID(propertyId)) {
        // All properties accept the values of "initial" and "inherit".
        String lowerCaseString = string.lower();
        if (lowerCaseString != "initial" && lowerCaseString != "inherit")
            return false;

        // Parse initial/inherit shorthands using the BisonCSSParser.
        if (shorthandForProperty(propertyId).length())
            return false;
    }

    CSSParserString cssString;
    cssString.init(string);
    CSSValueID valueID = cssValueKeywordID(cssString);

    if (!valueID)
        return false;

    RefPtrWillBeRawPtr<CSSValue> value = nullptr;
    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 parseTransformTranslateArguments(CharType*& pos, CharType* end, unsigned expectedCount, CSSTransformValue* transformValue)
{
    while (expectedCount) {
        size_t delimiter = WTF::find(pos, end - pos, expectedCount == 1 ? ')' : ',');
        if (delimiter == kNotFound)
            return false;
        unsigned argumentLength = static_cast<unsigned>(delimiter);
        CSSPrimitiveValue::UnitTypes unit = CSSPrimitiveValue::CSS_NUMBER;
        double number;
        if (!parseSimpleLength(pos, argumentLength, unit, number))
            return false;
        if (unit != CSSPrimitiveValue::CSS_PX && (number || unit != CSSPrimitiveValue::CSS_NUMBER))
            return false;
        transformValue->append(cssValuePool().createValue(number, CSSPrimitiveValue::CSS_PX));
        pos += argumentLength + 1;
        --expectedCount;
    }
    return true;
}

template <typename CharType>
static PassRefPtrWillBeRawPtr<CSSTransformValue> parseTranslateTransformValue(CharType*& pos, CharType* end)
{
    static const int shortestValidTransformStringLength = 12;

    if (end - pos < shortestValidTransformStringLength)
        return nullptr;

    if ((pos[0] != 't' && pos[0] != 'T')
        || (pos[1] != 'r' && pos[1] != 'R')
        || (pos[2] != 'a' && pos[2] != 'A')
        || (pos[3] != 'n' && pos[3] != 'N')
        || (pos[4] != 's' && pos[4] != 'S')
        || (pos[5] != 'l' && pos[5] != 'L')
        || (pos[6] != 'a' && pos[6] != 'A')
        || (pos[7] != 't' && pos[7] != 'T')
        || (pos[8] != 'e' && pos[8] != 'E'))
        return nullptr;

    CSSTransformValue::TransformOperationType transformType;
    unsigned expectedArgumentCount = 1;
    unsigned argumentStart = 11;
    if ((pos[9] == 'x' || pos[9] == 'X') && pos[10] == '(') {
        transformType = CSSTransformValue::TranslateXTransformOperation;
    } else if ((pos[9] == 'y' || pos[9] == 'Y') && pos[10] == '(') {
        transformType = CSSTransformValue::TranslateYTransformOperation;
    } else if ((pos[9] == 'z' || pos[9] == 'Z') && pos[10] == '(') {
        transformType = CSSTransformValue::TranslateZTransformOperation;
    } else if (pos[9] == '(') {
        transformType = CSSTransformValue::TranslateTransformOperation;
        expectedArgumentCount = 2;
        argumentStart = 10;
    } else if (pos[9] == '3' && (pos[10] == 'd' || pos[10] == 'D') && pos[11] == '(') {
        transformType = CSSTransformValue::Translate3DTransformOperation;
        expectedArgumentCount = 3;
        argumentStart = 12;
    } else {
        return nullptr;
    }
    pos += argumentStart;

    RefPtrWillBeRawPtr<CSSTransformValue> transformValue = CSSTransformValue::create(transformType);
    if (!parseTransformTranslateArguments(pos, end, expectedArgumentCount, transformValue.get()))
        return nullptr;
    return transformValue.release();
}

template <typename CharType>
static PassRefPtrWillBeRawPtr<CSSValueList> parseTranslateTransformList(CharType*& pos, CharType* end)
{
    RefPtrWillBeRawPtr<CSSValueList> transformList = nullptr;
    while (pos < end) {
        while (pos < end && isCSSSpace(*pos))
            ++pos;
        RefPtrWillBeRawPtr<CSSTransformValue> transformValue = parseTranslateTransformValue(pos, end);
        if (!transformValue)
            return nullptr;
        if (!transformList)
            transformList = CSSValueList::createSpaceSeparated();
        transformList->append(transformValue.release());
        if (pos < end) {
            if (isCSSSpace(*pos))
                return nullptr;
        }
    }
    return transformList.release();
}

static bool parseTranslateTransform(MutableStylePropertySet* properties, CSSPropertyID propertyID, const String& string, bool important)
{
    if (propertyID != CSSPropertyTransform && propertyID != CSSPropertyWebkitTransform)
        return false;
    if (string.isEmpty())
        return false;
    RefPtrWillBeRawPtr<CSSValueList> transformList = nullptr;
    if (string.is8Bit()) {
        const LChar* pos = string.characters8();
        const LChar* end = pos + string.length();
        transformList = parseTranslateTransformList(pos, end);
        if (!transformList)
            return false;
    } else {
        const UChar* pos = string.characters16();
        const UChar* end = pos + string.length();
        transformList = parseTranslateTransformList(pos, end);
        if (!transformList)
            return false;
    }
    properties->addParsedProperty(CSSProperty(propertyID, transformList.release(), important));
    return true;
}

PassRefPtrWillBeRawPtr<CSSValueList> BisonCSSParser::parseFontFaceValue(const AtomicString& string)
{
    if (string.isEmpty())
        return nullptr;
    RefPtrWillBeRawPtr<MutableStylePropertySet> dummyStyle = MutableStylePropertySet::create();
    if (!parseValue(dummyStyle.get(), CSSPropertyFontFamily, string, false, HTMLQuirksMode, 0))
        return nullptr;

    RefPtrWillBeRawPtr<CSSValue> fontFamily = dummyStyle->getPropertyCSSValue(CSSPropertyFontFamily);
    if (!fontFamily->isValueList())
        return nullptr;

    return toCSSValueList(dummyStyle->getPropertyCSSValue(CSSPropertyFontFamily).get());
}

PassRefPtrWillBeRawPtr<CSSValue> BisonCSSParser::parseAnimationTimingFunctionValue(const String& string)
{
    if (string.isEmpty())
        return nullptr;
    RefPtrWillBeRawPtr<MutableStylePropertySet> style = MutableStylePropertySet::create();
    if (!parseValue(style.get(), CSSPropertyAnimationTimingFunction, string, false, HTMLStandardMode, 0))
        return nullptr;

    return style->getPropertyCSSValue(CSSPropertyAnimationTimingFunction);
}

bool BisonCSSParser::parseValue(MutableStylePropertySet* declaration, CSSPropertyID propertyID, const String& string, bool important, const Document& document)
{
    ASSERT(!string.isEmpty());

    CSSParserContext context(document, UseCounter::getFrom(&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;

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

bool BisonCSSParser::parseValue(MutableStylePropertySet* 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;

    CSSParserContext context(cssParserMode, 0);
    if (contextStyleSheet) {
        context = contextStyleSheet->parserContext();
        context.setMode(cssParserMode);
    }

    if (parseKeywordValue(declaration, propertyID, string, important, context))
        return true;
    if (parseTranslateTransform(declaration, propertyID, string, important))
        return true;

    BisonCSSParser parser(context);
    return parser.parseValue(declaration, propertyID, string, important, contextStyleSheet);
}

bool BisonCSSParser::parseValue(MutableStylePropertySet* declaration, CSSPropertyID propertyID, const String& string, bool important, StyleSheetContents* contextStyleSheet)
{
    // FIXME: Check RuntimeCSSEnabled::isPropertyEnabled or isValueEnabledForProperty.

    if (m_context.useCounter())
        m_context.useCounter()->count(m_context, propertyID);

    setStyleSheet(contextStyleSheet);

    setupParser("@-internal-value ", string, "");

    m_id = propertyID;
    m_important = important;

    {
        StyleDeclarationScope scope(this, declaration);
        cssyyparse(this);
    }

    m_rule = nullptr;
    m_id = CSSPropertyInvalid;

    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 BisonCSSParser::parseColor(RGBA32& color, const String& string, bool strict)
{
    // First try creating a color specified by name, rgba(), rgb() or "#" syntax.
    if (CSSPropertyParser::fastParseColor(color, string, strict))
        return true;

    BisonCSSParser parser(strictCSSParserContext());

    // 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 = toCSSPrimitiveValue(value);
    if (!primitiveValue->isRGBColor())
        return false;

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

bool BisonCSSParser::parseColor(const String& string)
{
    setupParser("@-internal-decls color:", string, "");
    cssyyparse(this);
    m_rule = nullptr;

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

bool BisonCSSParser::parseSystemColor(RGBA32& color, const String& string)
{
    CSSParserString cssColor;
    cssColor.init(string);
    CSSValueID id = cssValueKeywordID(cssColor);
    if (!CSSPropertyParser::isSystemColor(id))
        return false;

    Color parsedColor = RenderTheme::theme().systemColor(id);
    color = parsedColor.rgb();
    return true;
}

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

    setupParser("@-internal-selector ", string, "");

    cssyyparse(this);

    m_selectorListForParseSelector = 0;
}

PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::parseInlineStyleDeclaration(const String& string, Element* element)
{
    Document& document = element->document();
    CSSParserContext context = CSSParserContext(document.elementSheet().contents()->parserContext(), UseCounter::getFrom(&document));
    context.setMode((element->isHTMLElement() && !document.inQuirksMode()) ? HTMLStandardMode : HTMLQuirksMode);
    return BisonCSSParser(context).parseDeclaration(string, document.elementSheet().contents());
}

PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::parseDeclaration(const String& string, StyleSheetContents* contextStyleSheet)
{
    setStyleSheet(contextStyleSheet);

    setupParser("@-internal-decls ", string, "");
    cssyyparse(this);
    m_rule = nullptr;

    if (m_hasFontFaceOnlyValues)
        deleteFontFaceOnlyValues();

    RefPtr<ImmutableStylePropertySet> style = createStylePropertySet();
    clearProperties();
    return style.release();
}


bool BisonCSSParser::parseDeclaration(MutableStylePropertySet* declaration, const String& string, CSSParserObserver* observer, StyleSheetContents* contextStyleSheet)
{
    setStyleSheet(contextStyleSheet);

    TemporaryChange<CSSParserObserver*> scopedObsever(m_observer, observer);

    setupParser("@-internal-decls ", string, "");
    if (m_observer) {
        m_observer->startRuleHeader(CSSRuleSourceData::STYLE_RULE, 0);
        m_observer->endRuleHeader(1);
        m_observer->startRuleBody(0);
    }

    {
        StyleDeclarationScope scope(this, declaration);
        cssyyparse(this);
    }

    m_rule = nullptr;

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

    if (m_observer)
        m_observer->endRuleBody(string.length(), false);

    return ok;
}

PassRefPtrWillBeRawPtr<MediaQuerySet> BisonCSSParser::parseMediaQueryList(const String& string)
{
    ASSERT(!m_mediaList);

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

    ASSERT(m_mediaList);
    return m_mediaList.release();
}

static inline void filterProperties(bool important, const WillBeHeapVector<CSSProperty, 256>& input, WillBeHeapVector<CSSProperty, 256>& output, size_t& unusedEntries, BitArray<numCSSProperties>& seenProperties)
{
    // 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;
        const unsigned propertyIDIndex = property.id() - firstCSSProperty;
        if (seenProperties.get(propertyIDIndex))
            continue;
        seenProperties.set(propertyIDIndex);
        output[--unusedEntries] = property;
    }
}

PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::createStylePropertySet()
{
    BitArray<numCSSProperties> seenProperties;
    size_t unusedEntries = m_parsedProperties.size();
    WillBeHeapVector<CSSProperty, 256> results(unusedEntries);

    // Important properties have higher priority, so add them first. Duplicate definitions can then be ignored when found.
    filterProperties(true, m_parsedProperties, results, unusedEntries, seenProperties);
    filterProperties(false, m_parsedProperties, results, unusedEntries, seenProperties);
    if (unusedEntries)
        results.remove(0, unusedEntries);

    CSSParserMode mode = inViewport() ? CSSViewportRuleMode : m_context.mode();

    return ImmutableStylePropertySet::create(results.data(), results.size(), mode);
}

void BisonCSSParser::rollbackLastProperties(int num)
{
    ASSERT(num >= 0);
    ASSERT(m_parsedProperties.size() >= static_cast<unsigned>(num));
    m_parsedProperties.shrink(m_parsedProperties.size() - num);
}

void BisonCSSParser::clearProperties()
{
    m_parsedProperties.clear();
    m_numParsedPropertiesBeforeMarginBox = INVALID_NUM_PARSED_PROPERTIES;
    m_hasFontFaceOnlyValues = false;
}

void BisonCSSParser::setCurrentProperty(CSSPropertyID propId)
{
    m_id = propId;
}

bool BisonCSSParser::parseValue(CSSPropertyID propId, bool important)
{
    CSSPropertyParser parser(m_valueList, m_context, m_inViewport, m_important, m_parsedProperties, m_hasFontFaceOnlyValues);
    return parser.parseValue(propId, important);
}


class TransformOperationInfo {
public:
    TransformOperationInfo(const CSSParserString& name)
        : m_type(CSSTransformValue::UnknownTransformOperation)
        , m_argCount(1)
        , m_allowSingleArgument(false)
        , m_unit(CSSPropertyParser::FUnknown)
    {
        const UChar* characters;
        unsigned nameLength = name.length();

        const unsigned longestNameLength = 12;
        UChar characterBuffer[longestNameLength];
        if (name.is8Bit()) {
            unsigned length = std::min(longestNameLength, nameLength);
            const LChar* characters8 = name.characters8();
            for (unsigned i = 0; i < length; ++i)
                characterBuffer[i] = characters8[i];
            characters = characterBuffer;
        } else
            characters = name.characters16();

        SWITCH(characters, nameLength) {
            CASE("skew(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::SkewTransformOperation;
                m_allowSingleArgument = true;
                m_argCount = 3;
            }
            CASE("scale(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::ScaleTransformOperation;
                m_allowSingleArgument = true;
                m_argCount = 3;
            }
            CASE("skewx(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::SkewXTransformOperation;
            }
            CASE("skewy(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::SkewYTransformOperation;
            }
            CASE("matrix(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::MatrixTransformOperation;
                m_argCount = 11;
            }
            CASE("rotate(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::RotateTransformOperation;
            }
            CASE("scalex(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::ScaleXTransformOperation;
            }
            CASE("scaley(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::ScaleYTransformOperation;
            }
            CASE("scalez(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::ScaleZTransformOperation;
            }
            CASE("scale3d(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::Scale3DTransformOperation;
                m_argCount = 5;
            }
            CASE("rotatex(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::RotateXTransformOperation;
            }
            CASE("rotatey(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::RotateYTransformOperation;
            }
            CASE("rotatez(") {
                m_unit = CSSPropertyParser::FAngle;
                m_type = CSSTransformValue::RotateZTransformOperation;
            }
            CASE("matrix3d(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::Matrix3DTransformOperation;
                m_argCount = 31;
            }
            CASE("rotate3d(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::Rotate3DTransformOperation;
                m_argCount = 7;
            }
            CASE("translate(") {
                m_unit = CSSPropertyParser::FLength | CSSPropertyParser::FPercent;
                m_type = CSSTransformValue::TranslateTransformOperation;
                m_allowSingleArgument = true;
                m_argCount = 3;
            }
            CASE("translatex(") {
                m_unit = CSSPropertyParser::FLength | CSSPropertyParser::FPercent;
                m_type = CSSTransformValue::TranslateXTransformOperation;
            }
            CASE("translatey(") {
                m_unit = CSSPropertyParser::FLength | CSSPropertyParser::FPercent;
                m_type = CSSTransformValue::TranslateYTransformOperation;
            }
            CASE("translatez(") {
                m_unit = CSSPropertyParser::FLength | CSSPropertyParser::FPercent;
                m_type = CSSTransformValue::TranslateZTransformOperation;
            }
            CASE("perspective(") {
                m_unit = CSSPropertyParser::FNumber;
                m_type = CSSTransformValue::PerspectiveTransformOperation;
            }
            CASE("translate3d(") {
                m_unit = CSSPropertyParser::FLength | CSSPropertyParser::FPercent;
                m_type = CSSTransformValue::Translate3DTransformOperation;
                m_argCount = 5;
            }
        }
    }

    CSSTransformValue::TransformOperationType type() const { return m_type; }
    unsigned argCount() const { return m_argCount; }
    CSSPropertyParser::Units unit() const { return m_unit; }

    bool unknown() const { return m_type == CSSTransformValue::UnknownTransformOperation; }
    bool hasCorrectArgCount(unsigned argCount) { return m_argCount == argCount || (m_allowSingleArgument && argCount == 1); }

private:
    CSSTransformValue::TransformOperationType m_type;
    unsigned m_argCount;
    bool m_allowSingleArgument;
    CSSPropertyParser::Units m_unit;
};

PassRefPtrWillBeRawPtr<CSSValueList> CSSPropertyParser::parseTransform(CSSPropertyID propId)
{
    if (!m_valueList)
        return nullptr;

    RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
    for (CSSParserValue* value = m_valueList->current(); value; value = m_valueList->next()) {
        RefPtrWillBeRawPtr<CSSValue> parsedTransformValue = parseTransformValue(propId, value);
        if (!parsedTransformValue)
            return nullptr;

        list->append(parsedTransformValue.release());
    }

    return list.release();
}

PassRefPtrWillBeRawPtr<CSSValue> CSSPropertyParser::parseTransformValue(CSSPropertyID propId, CSSParserValue *value)
{
    if (value->unit != CSSParserValue::Function || !value->function)
        return nullptr;

    // Every primitive requires at least one argument.
    CSSParserValueList* args = value->function->args.get();
    if (!args)
        return nullptr;

    // See if the specified primitive is one we understand.
    TransformOperationInfo info(value->function->name);
    if (info.unknown())
        return nullptr;

    if (!info.hasCorrectArgCount(args->size()))
        return nullptr;

    // The transform is a list of functional primitives that specify transform operations.
    // We collect a list of CSSTransformValues, where each value specifies a single operation.

    // Create the new CSSTransformValue for this operation and add it to our list.
    RefPtrWillBeRawPtr<CSSTransformValue> transformValue = CSSTransformValue::create(info.type());

    // Snag our values.
    CSSParserValue* a = args->current();
    unsigned argNumber = 0;
    while (a) {
        CSSPropertyParser::Units unit = info.unit();

        if (info.type() == CSSTransformValue::Rotate3DTransformOperation && argNumber == 3) {
            // 4th param of rotate3d() is an angle rather than a bare number, validate it as such
            if (!validUnit(a, FAngle, HTMLStandardMode))
                return nullptr;
        } else if (info.type() == CSSTransformValue::Translate3DTransformOperation && argNumber == 2) {
            // 3rd param of translate3d() cannot be a percentage
            if (!validUnit(a, FLength, HTMLStandardMode))
                return nullptr;
        } else if (info.type() == CSSTransformValue::TranslateZTransformOperation && !argNumber) {
            // 1st param of translateZ() cannot be a percentage
            if (!validUnit(a, FLength, HTMLStandardMode))
                return nullptr;
        } else if (info.type() == CSSTransformValue::PerspectiveTransformOperation && !argNumber) {
            // 1st param of perspective() must be a non-negative number (deprecated) or length.
            if ((propId == CSSPropertyWebkitTransform && !validUnit(a, FNumber | FLength | FNonNeg, HTMLStandardMode))
                || (propId == CSSPropertyTransform && !validUnit(a, FLength | FNonNeg, HTMLStandardMode)))
                return nullptr;
        } else if (!validUnit(a, unit, HTMLStandardMode)) {
            return nullptr;
        }

        // Add the value to the current transform operation.
        transformValue->append(createPrimitiveNumericValue(a));

        a = args->next();
        if (!a)
            break;
        if (a->unit != CSSParserValue::Operator || a->iValue != ',')
            return nullptr;
        a = args->next();

        argNumber++;
    }

    return transformValue.release();
}

void BisonCSSParser::ensureLineEndings()
{
    if (!m_lineEndings)
        m_lineEndings = lineEndings(*m_source);
}

CSSParserSelector* BisonCSSParser::createFloatingSelectorWithTagName(const QualifiedName& tagQName)
{
    CSSParserSelector* selector = new CSSParserSelector(tagQName);
    m_floatingSelectors.append(selector);
    return selector;
}

CSSParserSelector* BisonCSSParser::createFloatingSelector()
{
    CSSParserSelector* selector = new CSSParserSelector;
    m_floatingSelectors.append(selector);
    return selector;
}

PassOwnPtr<CSSParserSelector> BisonCSSParser::sinkFloatingSelector(CSSParserSelector* selector)
{
    if (selector) {
        size_t index = m_floatingSelectors.reverseFind(selector);
        ASSERT(index != kNotFound);
        m_floatingSelectors.remove(index);
    }
    return adoptPtr(selector);
}

Vector<OwnPtr<CSSParserSelector> >* BisonCSSParser::createFloatingSelectorVector()
{
    Vector<OwnPtr<CSSParserSelector> >* selectorVector = new Vector<OwnPtr<CSSParserSelector> >;
    m_floatingSelectorVectors.append(selectorVector);
    return selectorVector;
}

PassOwnPtr<Vector<OwnPtr<CSSParserSelector> > > BisonCSSParser::sinkFloatingSelectorVector(Vector<OwnPtr<CSSParserSelector> >* selectorVector)
{
    if (selectorVector) {
        size_t index = m_floatingSelectorVectors.reverseFind(selectorVector);
        ASSERT(index != kNotFound);
        m_floatingSelectorVectors.remove(index);
    }
    return adoptPtr(selectorVector);
}

CSSParserValueList* BisonCSSParser::createFloatingValueList()
{
    CSSParserValueList* list = new CSSParserValueList;
    m_floatingValueLists.append(list);
    return list;
}

PassOwnPtr<CSSParserValueList> BisonCSSParser::sinkFloatingValueList(CSSParserValueList* list)
{
    if (list) {
        size_t index = m_floatingValueLists.reverseFind(list);
        ASSERT(index != kNotFound);
        m_floatingValueLists.remove(index);
    }
    return adoptPtr(list);
}

CSSParserFunction* BisonCSSParser::createFloatingFunction()
{
    CSSParserFunction* function = new CSSParserFunction;
    m_floatingFunctions.append(function);
    return function;
}

CSSParserFunction* BisonCSSParser::createFloatingFunction(const CSSParserString& name, PassOwnPtr<CSSParserValueList> args)
{
    CSSParserFunction* function = createFloatingFunction();
    function->name = name;
    function->args = args;
    return function;
}

PassOwnPtr<CSSParserFunction> BisonCSSParser::sinkFloatingFunction(CSSParserFunction* function)
{
    if (function) {
        size_t index = m_floatingFunctions.reverseFind(function);
        ASSERT(index != kNotFound);
        m_floatingFunctions.remove(index);
    }
    return adoptPtr(function);
}

CSSParserValue& BisonCSSParser::sinkFloatingValue(CSSParserValue& value)
{
    if (value.unit == CSSParserValue::Function) {
        size_t index = m_floatingFunctions.reverseFind(value.function);
        ASSERT(index != kNotFound);
        m_floatingFunctions.remove(index);
    }
    return value;
}

MediaQueryExp* BisonCSSParser::createFloatingMediaQueryExp(const AtomicString& mediaFeature, CSSParserValueList* values)
{
    m_floatingMediaQueryExp = MediaQueryExp::createIfValid(mediaFeature, values);
    return m_floatingMediaQueryExp.get();
}

PassOwnPtrWillBeRawPtr<MediaQueryExp> BisonCSSParser::sinkFloatingMediaQueryExp(MediaQueryExp* expression)
{
    ASSERT_UNUSED(expression, expression == m_floatingMediaQueryExp);
    return m_floatingMediaQueryExp.release();
}

WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> >* BisonCSSParser::createFloatingMediaQueryExpList()
{
    m_floatingMediaQueryExpList = adoptPtrWillBeNoop(new WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> >);
    return m_floatingMediaQueryExpList.get();
}

PassOwnPtrWillBeRawPtr<WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> > > BisonCSSParser::sinkFloatingMediaQueryExpList(WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> >* list)
{
    ASSERT_UNUSED(list, list == m_floatingMediaQueryExpList);
    return m_floatingMediaQueryExpList.release();
}

MediaQuery* BisonCSSParser::createFloatingMediaQuery(MediaQuery::Restrictor restrictor, const AtomicString& mediaType, PassOwnPtrWillBeRawPtr<WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> > > expressions)
{
    m_floatingMediaQuery = adoptPtrWillBeNoop(new MediaQuery(restrictor, mediaType, expressions));
    return m_floatingMediaQuery.get();
}

MediaQuery* BisonCSSParser::createFloatingMediaQuery(PassOwnPtrWillBeRawPtr<WillBeHeapVector<OwnPtrWillBeMember<MediaQueryExp> > > expressions)
{
    return createFloatingMediaQuery(MediaQuery::None, AtomicString("all", AtomicString::ConstructFromLiteral), expressions);
}

MediaQuery* BisonCSSParser::createFloatingNotAllQuery()
{
    return createFloatingMediaQuery(MediaQuery::Not, AtomicString("all", AtomicString::ConstructFromLiteral), sinkFloatingMediaQueryExpList(createFloatingMediaQueryExpList()));
}

PassOwnPtrWillBeRawPtr<MediaQuery> BisonCSSParser::sinkFloatingMediaQuery(MediaQuery* query)
{
    ASSERT_UNUSED(query, query == m_floatingMediaQuery);
    return m_floatingMediaQuery.release();
}

WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> >* BisonCSSParser::createFloatingKeyframeVector()
{
    m_floatingKeyframeVector = adoptPtrWillBeNoop(new WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> >());
    return m_floatingKeyframeVector.get();
}

PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> > > BisonCSSParser::sinkFloatingKeyframeVector(WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> >* keyframeVector)
{
    ASSERT_UNUSED(keyframeVector, m_floatingKeyframeVector == keyframeVector);
    return m_floatingKeyframeVector.release();
}

MediaQuerySet* BisonCSSParser::createMediaQuerySet()
{
    RefPtrWillBeRawPtr<MediaQuerySet> queries = MediaQuerySet::create();
    MediaQuerySet* result = queries.get();
    m_parsedMediaQuerySets.append(queries.release());
    return result;
}

StyleRuleBase* BisonCSSParser::createImportRule(const CSSParserString& url, MediaQuerySet* media)
{
    if (!media || !m_allowImportRules)
        return 0;
    RefPtrWillBeRawPtr<StyleRuleImport> rule = StyleRuleImport::create(url, media);
    StyleRuleImport* result = rule.get();
    m_parsedRules.append(rule.release());
    return result;
}

StyleRuleBase* BisonCSSParser::createMediaRule(MediaQuerySet* media, RuleList* rules)
{
    m_allowImportRules = m_allowNamespaceDeclarations = false;
    RefPtrWillBeRawPtr<StyleRuleMedia> rule = nullptr;
    if (rules) {
        rule = StyleRuleMedia::create(media ? media : MediaQuerySet::create().get(), *rules);
    } else {
        RuleList emptyRules;
        rule = StyleRuleMedia::create(media ? media : MediaQuerySet::create().get(), emptyRules);
    }
    StyleRuleMedia* result = rule.get();
    m_parsedRules.append(rule.release());
    return result;
}

StyleRuleBase* BisonCSSParser::createSupportsRule(bool conditionIsSupported, RuleList* rules)
{
    m_allowImportRules = m_allowNamespaceDeclarations = false;

    RefPtrWillBeRawPtr<CSSRuleSourceData> data = popSupportsRuleData();
    RefPtrWillBeRawPtr<StyleRuleSupports> rule = nullptr;
    String conditionText;
    unsigned conditionOffset = data->ruleHeaderRange.start + 9;
    unsigned conditionLength = data->ruleHeaderRange.length() - 9;

    if (m_tokenizer.is8BitSource())
        conditionText = String(m_tokenizer.m_dataStart8.get() + conditionOffset, conditionLength).stripWhiteSpace();
    else
        conditionText = String(m_tokenizer.m_dataStart16.get() + conditionOffset, conditionLength).stripWhiteSpace();

    if (rules) {
        rule = StyleRuleSupports::create(conditionText, conditionIsSupported, *rules);
    } else {
        RuleList emptyRules;
        rule = StyleRuleSupports::create(conditionText, conditionIsSupported, emptyRules);
    }

    StyleRuleSupports* result = rule.get();
    m_parsedRules.append(rule.release());

    return result;
}

void BisonCSSParser::markSupportsRuleHeaderStart()
{
    if (!m_supportsRuleDataStack)
        m_supportsRuleDataStack = adoptPtrWillBeNoop(new RuleSourceDataList());

    RefPtrWillBeRawPtr<CSSRuleSourceData> data = CSSRuleSourceData::create(CSSRuleSourceData::SUPPORTS_RULE);
    data->ruleHeaderRange.start = m_tokenizer.tokenStartOffset();
    m_supportsRuleDataStack->append(data);
}

void BisonCSSParser::markSupportsRuleHeaderEnd()
{
    ASSERT(m_supportsRuleDataStack && !m_supportsRuleDataStack->isEmpty());

    if (m_tokenizer.is8BitSource())
        m_supportsRuleDataStack->last()->ruleHeaderRange.end = m_tokenizer.tokenStart<LChar>() - m_tokenizer.m_dataStart8.get();
    else
        m_supportsRuleDataStack->last()->ruleHeaderRange.end = m_tokenizer.tokenStart<UChar>() - m_tokenizer.m_dataStart16.get();
}

PassRefPtrWillBeRawPtr<CSSRuleSourceData> BisonCSSParser::popSupportsRuleData()
{
    ASSERT(m_supportsRuleDataStack && !m_supportsRuleDataStack->isEmpty());
    RefPtrWillBeRawPtr<CSSRuleSourceData> data = m_supportsRuleDataStack->last();
    m_supportsRuleDataStack->removeLast();
    return data.release();
}

BisonCSSParser::RuleList* BisonCSSParser::createRuleList()
{
    OwnPtrWillBeRawPtr<RuleList> list = adoptPtrWillBeNoop(new RuleList);
    RuleList* listPtr = list.get();

    m_parsedRuleLists.append(list.release());
    return listPtr;
}

BisonCSSParser::RuleList* BisonCSSParser::appendRule(RuleList* ruleList, StyleRuleBase* rule)
{
    if (rule) {
        if (!ruleList)
            ruleList = createRuleList();
        ruleList->append(rule);
    }
    return ruleList;
}

template <typename CharacterType>
ALWAYS_INLINE static void makeLower(const CharacterType* input, CharacterType* output, unsigned length)
{
    // 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(input, length)) {
        // Fast case for all-ASCII.
        for (unsigned i = 0; i < length; i++)
            output[i] = toASCIILower(input[i]);
    } else {
        for (unsigned i = 0; i < length; i++)
            output[i] = Unicode::toLower(input[i]);
    }
}

void BisonCSSParser::tokenToLowerCase(CSSParserString& token)
{
    // Since it's our internal token, we know that we created it out
    // of our writable work buffers. Therefore the const_cast is just
    // ugly and not a potential crash.
    size_t length = token.length();
    if (token.is8Bit()) {
        makeLower(token.characters8(), const_cast<LChar*>(token.characters8()), length);
    } else {
        makeLower(token.characters16(), const_cast<UChar*>(token.characters16()), length);
    }
}

void BisonCSSParser::endInvalidRuleHeader()
{
    if (m_ruleHeaderType == CSSRuleSourceData::UNKNOWN_RULE)
        return;

    CSSParserLocation location;
    location.lineNumber = m_tokenizer.m_lineNumber;
    location.offset = m_ruleHeaderStartOffset;
    if (m_tokenizer.is8BitSource())
        location.token.init(m_tokenizer.m_dataStart8.get() + m_ruleHeaderStartOffset, 0);
    else
        location.token.init(m_tokenizer.m_dataStart16.get() + m_ruleHeaderStartOffset, 0);

    reportError(location, m_ruleHeaderType == CSSRuleSourceData::STYLE_RULE ? InvalidSelectorCSSError : InvalidRuleCSSError);

    endRuleHeader();
}

void BisonCSSParser::reportError(const CSSParserLocation&, CSSParserError)
{
    // FIXME: error reporting temporatily disabled.
}

bool BisonCSSParser::isLoggingErrors()
{
    return m_logErrors && !m_ignoreErrors;
}

void BisonCSSParser::logError(const String& message, const CSSParserLocation& location)
{
    unsigned lineNumberInStyleSheet;
    unsigned columnNumber = 0;
    if (InspectorInstrumentation::hasFrontends()) {
        ensureLineEndings();
        TextPosition tokenPosition = TextPosition::fromOffsetAndLineEndings(location.offset, *m_lineEndings);
        lineNumberInStyleSheet = tokenPosition.m_line.zeroBasedInt();
        columnNumber = (lineNumberInStyleSheet ? 0 : m_startPosition.m_column.zeroBasedInt()) + tokenPosition.m_column.zeroBasedInt();
    } else {
        lineNumberInStyleSheet = location.lineNumber;
    }
    PageConsole& console = m_styleSheet->singleOwnerDocument()->frameHost()->console();
    console.addMessage(CSSMessageSource, WarningMessageLevel, message, m_styleSheet->baseURL().string(), lineNumberInStyleSheet + m_startPosition.m_line.zeroBasedInt() + 1, columnNumber + 1);
}

StyleRuleKeyframes* BisonCSSParser::createKeyframesRule(const String& name, PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> > > popKeyframes, bool isPrefixed)
{
    OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<StyleKeyframe> > > keyframes = popKeyframes;
    m_allowImportRules = m_allowNamespaceDeclarations = false;
    RefPtrWillBeRawPtr<StyleRuleKeyframes> rule = StyleRuleKeyframes::create();
    for (size_t i = 0; i < keyframes->size(); ++i)
        rule->parserAppendKeyframe(keyframes->at(i));
    rule->setName(name);
    rule->setVendorPrefixed(isPrefixed);
    StyleRuleKeyframes* rulePtr = rule.get();
    m_parsedRules.append(rule.release());
    return rulePtr;
}

StyleRuleBase* BisonCSSParser::createStyleRule(Vector<OwnPtr<CSSParserSelector> >* selectors)
{
    StyleRule* result = 0;
    if (selectors) {
        m_allowImportRules = m_allowNamespaceDeclarations = false;
        RefPtrWillBeRawPtr<StyleRule> rule = StyleRule::create();
        rule->parserAdoptSelectorVector(*selectors);
        if (m_hasFontFaceOnlyValues)
            deleteFontFaceOnlyValues();
        rule->setProperties(createStylePropertySet());
        result = rule.get();
        m_parsedRules.append(rule.release());
    }
    clearProperties();
    return result;
}

StyleRuleBase* BisonCSSParser::createFontFaceRule()
{
    m_allowImportRules = m_allowNamespaceDeclarations = false;
    for (unsigned i = 0; i < m_parsedProperties.size(); ++i) {
        CSSProperty& property = m_parsedProperties[i];
        if (property.id() == CSSPropertyFontVariant && property.value()->isPrimitiveValue())
            property.wrapValueInCommaSeparatedList();
        else if (property.id() == CSSPropertyFontFamily && (!property.value()->isValueList() || toCSSValueList(property.value())->length() != 1)) {
            // Unlike font-family property, font-family descriptor in @font-face rule
            // has to be a value list with exactly one family name. It cannot have a
            // have 'initial' value and cannot 'inherit' from parent.
            // See http://dev.w3.org/csswg/css3-fonts/#font-family-desc
            clearProperties();
            return 0;
        }
    }
    RefPtrWillBeRawPtr<StyleRuleFontFace> rule = StyleRuleFontFace::create();
    rule->setProperties(createStylePropertySet());
    clearProperties();
    StyleRuleFontFace* result = rule.get();
    m_parsedRules.append(rule.release());
    if (m_styleSheet)
        m_styleSheet->setHasFontFaceRule(true);
    return result;
}

void BisonCSSParser::addNamespace(const AtomicString& prefix, const AtomicString& uri)
{
    if (!m_styleSheet || !m_allowNamespaceDeclarations)
        return;
    m_allowImportRules = false;
    m_styleSheet->parserAddNamespace(prefix, uri);
    if (prefix.isEmpty() && !uri.isNull())
        m_defaultNamespace = uri;
}

QualifiedName BisonCSSParser::determineNameInNamespace(const AtomicString& prefix, const AtomicString& localName)
{
    if (!m_styleSheet)
        return QualifiedName(prefix, localName, m_defaultNamespace);
    return QualifiedName(prefix, localName, m_styleSheet->determineNamespace(prefix));
}

CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithNamespaceIfNeeded(CSSParserSelector* specifiers)
{
    if (m_defaultNamespace != starAtom || specifiers->crossesTreeScopes())
        return rewriteSpecifiersWithElementName(nullAtom, starAtom, specifiers, /*tagIsForNamespaceRule*/true);
    return specifiers;
}

CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementName(const AtomicString& namespacePrefix, const AtomicString& elementName, CSSParserSelector* specifiers, bool tagIsForNamespaceRule)
{
    AtomicString determinedNamespace = namespacePrefix != nullAtom && m_styleSheet ? m_styleSheet->determineNamespace(namespacePrefix) : m_defaultNamespace;
    QualifiedName tag(namespacePrefix, elementName, determinedNamespace);

    if (specifiers->crossesTreeScopes())
        return rewriteSpecifiersWithElementNameForCustomPseudoElement(tag, elementName, specifiers, tagIsForNamespaceRule);

    if (specifiers->isContentPseudoElement())
        return rewriteSpecifiersWithElementNameForContentPseudoElement(tag, elementName, specifiers, tagIsForNamespaceRule);

    // *:host never matches, so we can't discard the * otherwise we can't tell the
    // difference between *:host and just :host.
    if (tag == anyQName() && !specifiers->hasHostPseudoSelector())
        return specifiers;
    if (specifiers->pseudoType() != CSSSelector::PseudoCue)
        specifiers->prependTagSelector(tag, tagIsForNamespaceRule);
    return specifiers;
}

CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementNameForCustomPseudoElement(const QualifiedName& tag, const AtomicString& elementName, CSSParserSelector* specifiers, bool tagIsForNamespaceRule)
{
    if (m_context.useCounter() && specifiers->pseudoType() == CSSSelector::PseudoUserAgentCustomElement)
        m_context.useCounter()->count(UseCounter::CSSPseudoElementUserAgentCustomPseudo);

    CSSParserSelector* lastShadowPseudo = specifiers;
    CSSParserSelector* history = specifiers;
    while (history->tagHistory()) {
        history = history->tagHistory();
        if (history->crossesTreeScopes() || history->hasShadowPseudo())
            lastShadowPseudo = history;
    }

    if (lastShadowPseudo->tagHistory()) {
        if (tag != anyQName())
            lastShadowPseudo->tagHistory()->prependTagSelector(tag, tagIsForNamespaceRule);
        return specifiers;
    }

    // For shadow-ID pseudo-elements to be correctly matched, the ShadowPseudo combinator has to be used.
    // We therefore create a new Selector with that combinator here in any case, even if matching any (host) element in any namespace (i.e. '*').
    OwnPtr<CSSParserSelector> elementNameSelector = adoptPtr(new CSSParserSelector(tag));
    lastShadowPseudo->setTagHistory(elementNameSelector.release());
    lastShadowPseudo->setRelation(CSSSelector::ShadowPseudo);
    return specifiers;
}

CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementNameForContentPseudoElement(const QualifiedName& tag, const AtomicString& elementName, CSSParserSelector* specifiers, bool tagIsForNamespaceRule)
{
    CSSParserSelector* last = specifiers;
    CSSParserSelector* history = specifiers;
    while (history->tagHistory()) {
        history = history->tagHistory();
        if (history->isContentPseudoElement() || history->relationIsAffectedByPseudoContent())
            last = history;
    }

    if (last->tagHistory()) {
        if (tag != anyQName())
            last->tagHistory()->prependTagSelector(tag, tagIsForNamespaceRule);
        return specifiers;
    }

    // For shadow-ID pseudo-elements to be correctly matched, the ShadowPseudo combinator has to be used.
    // We therefore create a new Selector with that combinator here in any case, even if matching any (host) element in any namespace (i.e. '*').
    OwnPtr<CSSParserSelector> elementNameSelector = adoptPtr(new CSSParserSelector(tag));
    last->setTagHistory(elementNameSelector.release());
    last->setRelation(CSSSelector::SubSelector);
    return specifiers;
}

CSSParserSelector* BisonCSSParser::rewriteSpecifiers(CSSParserSelector* specifiers, CSSParserSelector* newSpecifier)
{
    if (newSpecifier->crossesTreeScopes()) {
        // Unknown pseudo element always goes at the top of selector chain.
        newSpecifier->appendTagHistory(CSSSelector::ShadowPseudo, sinkFloatingSelector(specifiers));
        return newSpecifier;
    }
    if (newSpecifier->isContentPseudoElement()) {
        newSpecifier->appendTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(specifiers));
        return newSpecifier;
    }
    if (specifiers->crossesTreeScopes()) {
        // Specifiers for unknown pseudo element go right behind it in the chain.
        specifiers->insertTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier), CSSSelector::ShadowPseudo);
        return specifiers;
    }
    if (specifiers->isContentPseudoElement()) {
        specifiers->insertTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier), CSSSelector::SubSelector);
        return specifiers;
    }
    specifiers->appendTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier));
    return specifiers;
}

StyleRuleBase* BisonCSSParser::createPageRule(PassOwnPtr<CSSParserSelector> pageSelector)
{
    // FIXME: Margin at-rules are ignored.
    m_allowImportRules = m_allowNamespaceDeclarations = false;
    StyleRulePage* pageRule = 0;
    if (pageSelector) {
        RefPtrWillBeRawPtr<StyleRulePage> rule = StyleRulePage::create();
        Vector<OwnPtr<CSSParserSelector> > selectorVector;
        selectorVector.append(pageSelector);
        rule->parserAdoptSelectorVector(selectorVector);
        rule->setProperties(createStylePropertySet());
        pageRule = rule.get();
        m_parsedRules.append(rule.release());
    }
    clearProperties();
    return pageRule;
}

StyleRuleBase* BisonCSSParser::createMarginAtRule(CSSSelector::MarginBoxType /* marginBox */)
{
    // FIXME: Implement margin at-rule here, using:
    //        - marginBox: margin box
    //        - m_parsedProperties: properties at [m_numParsedPropertiesBeforeMarginBox, m_parsedProperties.size()] are for this at-rule.
    // Don't forget to also update the action for page symbol in CSSGrammar.y such that margin at-rule data is cleared if page_selector is invalid.

    endDeclarationsForMarginBox();
    return 0; // until this method is implemented.
}

void BisonCSSParser::startDeclarationsForMarginBox()
{
    m_numParsedPropertiesBeforeMarginBox = m_parsedProperties.size();
}

void BisonCSSParser::endDeclarationsForMarginBox()
{
    rollbackLastProperties(m_parsedProperties.size() - m_numParsedPropertiesBeforeMarginBox);
    m_numParsedPropertiesBeforeMarginBox = INVALID_NUM_PARSED_PROPERTIES;
}

void BisonCSSParser::deleteFontFaceOnlyValues()
{
    ASSERT(m_hasFontFaceOnlyValues);
    for (unsigned i = 0; i < m_parsedProperties.size();) {
        CSSProperty& property = m_parsedProperties[i];
        if (property.id() == CSSPropertyFontVariant && property.value()->isValueList()) {
            m_parsedProperties.remove(i);
            continue;
        }
        ++i;
    }
}

StyleKeyframe* BisonCSSParser::createKeyframe(CSSParserValueList* keys)
{
    OwnPtr<Vector<double> > keyVector = StyleKeyframe::createKeyList(keys);
    if (keyVector->isEmpty())
        return 0;

    RefPtrWillBeRawPtr<StyleKeyframe> keyframe = StyleKeyframe::create();
    keyframe->setKeys(keyVector.release());
    keyframe->setProperties(createStylePropertySet());

    clearProperties();

    StyleKeyframe* keyframePtr = keyframe.get();
    m_parsedKeyframes.append(keyframe.release());
    return keyframePtr;
}

void BisonCSSParser::invalidBlockHit()
{
    if (m_styleSheet && !m_hadSyntacticallyValidCSSRule)
        m_styleSheet->setHasSyntacticallyValidCSSHeader(false);
}

void BisonCSSParser::startRule()
{
    if (!m_observer)
        return;

    ASSERT(m_ruleHasHeader);
    m_ruleHasHeader = false;
}

void BisonCSSParser::endRule(bool valid)
{
    if (!m_observer)
        return;

    if (m_ruleHasHeader)
        m_observer->endRuleBody(m_tokenizer.safeUserStringTokenOffset(), !valid);
    m_ruleHasHeader = true;
}

void BisonCSSParser::startRuleHeader(CSSRuleSourceData::Type ruleType)
{
    resumeErrorLogging();
    m_ruleHeaderType = ruleType;
    m_ruleHeaderStartOffset = m_tokenizer.safeUserStringTokenOffset();
    m_ruleHeaderStartLineNumber = m_tokenizer.m_tokenStartLineNumber;
    if (m_observer) {
        ASSERT(!m_ruleHasHeader);
        m_observer->startRuleHeader(ruleType, m_ruleHeaderStartOffset);
        m_ruleHasHeader = true;
    }
}

void BisonCSSParser::endRuleHeader()
{
    ASSERT(m_ruleHeaderType != CSSRuleSourceData::UNKNOWN_RULE);
    m_ruleHeaderType = CSSRuleSourceData::UNKNOWN_RULE;
    if (m_observer) {
        ASSERT(m_ruleHasHeader);
        m_observer->endRuleHeader(m_tokenizer.safeUserStringTokenOffset());
    }
}

void BisonCSSParser::startSelector()
{
    if (m_observer)
        m_observer->startSelector(m_tokenizer.safeUserStringTokenOffset());
}

void BisonCSSParser::endSelector()
{
    if (m_observer)
        m_observer->endSelector(m_tokenizer.safeUserStringTokenOffset());
}

void BisonCSSParser::startRuleBody()
{
    if (m_observer)
        m_observer->startRuleBody(m_tokenizer.safeUserStringTokenOffset());
}

void BisonCSSParser::startProperty()
{
    resumeErrorLogging();
    if (m_observer)
        m_observer->startProperty(m_tokenizer.safeUserStringTokenOffset());
}

void BisonCSSParser::endProperty(bool isImportantFound, bool isPropertyParsed, CSSParserError errorType)
{
    m_id = CSSPropertyInvalid;
    if (m_observer)
        m_observer->endProperty(isImportantFound, isPropertyParsed, m_tokenizer.safeUserStringTokenOffset(), errorType);
}

void BisonCSSParser::startEndUnknownRule()
{
    if (m_observer)
        m_observer->startEndUnknownRule();
}

StyleRuleBase* BisonCSSParser::createViewportRule()
{
    // Allow @viewport rules from UA stylesheets even if the feature is disabled.
    if (!RuntimeEnabledFeatures::cssViewportEnabled() && !isUASheetBehavior(m_context.mode()))
        return 0;

    m_allowImportRules = m_allowNamespaceDeclarations = false;

    RefPtrWillBeRawPtr<StyleRuleViewport> rule = StyleRuleViewport::create();

    rule->setProperties(createStylePropertySet());
    clearProperties();

    StyleRuleViewport* result = rule.get();
    m_parsedRules.append(rule.release());

    return result;
}

}