Implement CSSValue::equals(const CSSValue&) to optimise CSSValue comparison

Implement CSSValue::equals(const CSSValue&) to optimise CSSValue comparison
https://bugs.webkit.org/show_bug.cgi?id=102901

Patch by Alexander Shalamov <alexander.shalamov@intel.com> on 2013-02-11
Reviewed by Antti Koivisto.

Source/WebCore:

Added comparison method to CSSValue and its children, so that the
css values could be compared efficiently. Before this patch, CSSValue
objects were compared using strings that were generated by the cssText() method.

Test: cssom/cssvalue-comparison.html

* css/CSSAspectRatioValue.cpp:
(WebCore::CSSAspectRatioValue::equals):
(WebCore):
* css/CSSAspectRatioValue.h:
(CSSAspectRatioValue):
* css/CSSBasicShapes.cpp:
(WebCore::CSSBasicShapeRectangle::equals):
(WebCore):
(WebCore::CSSBasicShapeCircle::equals):
(WebCore::CSSBasicShapeEllipse::equals):
(WebCore::CSSBasicShapePolygon::equals):
* css/CSSBasicShapes.h:
(CSSBasicShapeRectangle):
(CSSBasicShapeCircle):
(CSSBasicShapeEllipse):
(CSSBasicShapePolygon):
* css/CSSBorderImageSliceValue.cpp:
(WebCore::CSSBorderImageSliceValue::equals):
(WebCore):
* css/CSSBorderImageSliceValue.h:
(CSSBorderImageSliceValue):
* css/CSSCalculationValue.cpp:
(WebCore::CSSCalcValue::equals):
(WebCore):
(WebCore::CSSCalcPrimitiveValue::equals):
(CSSCalcPrimitiveValue):
(WebCore::CSSCalcPrimitiveValue::type):
(WebCore::CSSCalcBinaryOperation::equals):
(CSSCalcBinaryOperation):
(WebCore::CSSCalcBinaryOperation::type):
* css/CSSCalculationValue.h:
(WebCore::CSSCalcExpressionNode::equals):
(CSSCalcExpressionNode):
(CSSCalcValue):
* css/CSSCanvasValue.cpp:
(WebCore::CSSCanvasValue::equals):
(WebCore):
* css/CSSCanvasValue.h:
(CSSCanvasValue):
* css/CSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue):
(WebCore::CSSComputedStyleDeclaration::cssPropertyMatches):
(WebCore::CSSComputedStyleDeclaration::getCSSPropertyValuesForSidesShorthand):
* css/CSSCrossfadeValue.cpp:
(WebCore::CSSCrossfadeValue::equals):
(WebCore):
* css/CSSCrossfadeValue.h:
(CSSCrossfadeValue):
* css/CSSCursorImageValue.cpp:
(WebCore::CSSCursorImageValue::equals):
(WebCore):
* css/CSSCursorImageValue.h:
(CSSCursorImageValue):
* css/CSSFontFaceSrcValue.cpp:
(WebCore::CSSFontFaceSrcValue::equals):
(WebCore):
* css/CSSFontFaceSrcValue.h:
(CSSFontFaceSrcValue):
* css/CSSFunctionValue.cpp:
(WebCore::CSSFunctionValue::equals):
(WebCore):
* css/CSSFunctionValue.h:
(CSSFunctionValue):
* css/CSSGradientValue.cpp:
(WebCore::CSSLinearGradientValue::equals):
(WebCore):
(WebCore::CSSRadialGradientValue::equals):
* css/CSSGradientValue.h:
(WebCore::CSSGradientColorStop::operator==):
(CSSLinearGradientValue):
(CSSRadialGradientValue):
* css/CSSImageValue.cpp:
(WebCore::CSSImageValue::equals):
(WebCore):
* css/CSSImageValue.h:
(CSSImageValue):
* css/CSSInheritedValue.h:
(WebCore::CSSInheritedValue::equals):
(CSSInheritedValue):
* css/CSSInitialValue.h:
(WebCore::CSSInitialValue::equals):
(CSSInitialValue):
* css/CSSLineBoxContainValue.h:
(WebCore::CSSLineBoxContainValue::equals):
* css/CSSPrimitiveValue.cpp:
(WebCore::CSSPrimitiveValue::equals):
(WebCore):
* css/CSSPrimitiveValue.h:
(CSSPrimitiveValue):
* css/CSSReflectValue.cpp:
(WebCore::CSSReflectValue::equals):
(WebCore):
* css/CSSReflectValue.h:
(CSSReflectValue):
* css/CSSTimingFunctionValue.cpp:
(WebCore::CSSCubicBezierTimingFunctionValue::equals):
(WebCore):
(WebCore::CSSStepsTimingFunctionValue::equals):
* css/CSSTimingFunctionValue.h:
(WebCore::CSSLinearTimingFunctionValue::equals):
(CSSLinearTimingFunctionValue):
(CSSCubicBezierTimingFunctionValue):
(CSSStepsTimingFunctionValue):
* css/CSSUnicodeRangeValue.cpp:
(WebCore::CSSUnicodeRangeValue::equals):
(WebCore):
* css/CSSUnicodeRangeValue.h:
(CSSUnicodeRangeValue):
* css/CSSValue.cpp:
(WebCore):
(WebCore::compareCSSValues):
(WebCore::CSSValue::equals):
* css/CSSValue.h:
(CSSValue):
(WebCore):
(WebCore::compareCSSValueVector):
(WebCore::compareCSSValuePtr):
* css/CSSValueList.cpp:
(WebCore::CSSValueList::removeAll):
(WebCore::CSSValueList::hasValue):
(WebCore::CSSValueList::equals):
(WebCore):
* css/CSSValueList.h:
(CSSValueList):
* css/CSSVariableValue.h:
(WebCore::CSSVariableValue::equals):
(CSSVariableValue):
* css/Counter.h:
(Counter):
(WebCore::Counter::equals):
* css/DashboardRegion.h:
(WebCore::DashboardRegion::equals):
* css/FontFeatureValue.cpp:
(WebCore::FontFeatureValue::equals):
(WebCore):
* css/FontFeatureValue.h:
(FontFeatureValue):
* css/FontValue.cpp:
(WebCore::FontValue::equals):
(WebCore):
* css/FontValue.h:
(FontValue):
* css/MediaQueryExp.h:
(WebCore::MediaQueryExp::operator==):
* css/Pair.h:
(WebCore::Pair::equals):
(Pair):
* css/Rect.h:
(WebCore::RectBase::equals):
(RectBase):
* css/ShadowValue.cpp:
(WebCore::ShadowValue::equals):
(WebCore):
* css/ShadowValue.h:
(ShadowValue):
* css/StylePropertySet.cpp:
(WebCore::StylePropertySet::get4Values):
(WebCore::StylePropertySet::propertyMatches):
* css/WebKitCSSArrayFunctionValue.cpp:
(WebCore::WebKitCSSArrayFunctionValue::equals):
(WebCore):
* css/WebKitCSSArrayFunctionValue.h:
(WebKitCSSArrayFunctionValue):
* css/WebKitCSSFilterValue.cpp:
(WebCore::WebKitCSSFilterValue::equals):
(WebCore):
* css/WebKitCSSFilterValue.h:
(WebKitCSSFilterValue):
* css/WebKitCSSMixFunctionValue.cpp:
(WebCore::WebKitCSSMixFunctionValue::equals):
(WebCore):
* css/WebKitCSSMixFunctionValue.h:
(WebKitCSSMixFunctionValue):
* css/WebKitCSSSVGDocumentValue.cpp:
(WebCore::WebKitCSSSVGDocumentValue::equals):
(WebCore):
* css/WebKitCSSSVGDocumentValue.h:
(WebKitCSSSVGDocumentValue):
* css/WebKitCSSShaderValue.cpp:
(WebCore::WebKitCSSShaderValue::equals):
(WebCore):
* css/WebKitCSSShaderValue.h:
(WebKitCSSShaderValue):
* css/WebKitCSSTransformValue.h:
(WebCore::WebKitCSSTransformValue::equals):
* editing/EditingStyle.cpp:
(WebCore::HTMLAttributeEquivalent::valueIsPresentInStyle):
* svg/SVGColor.cpp:
(WebCore::SVGColor::equals):
(WebCore):
* svg/SVGColor.h:
(SVGColor):
* svg/SVGPaint.cpp:
(WebCore::SVGPaint::equals):
(WebCore):
* svg/SVGPaint.h:
(SVGPaint):

LayoutTests:

New layout test to verify that CSSValue objects comparison works properly.

* cssom/cssvalue-comparison-expected.txt: Added.
* cssom/cssvalue-comparison.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@142444 268f45cc-cd09-0410-ab3c-d52691b4dbfc