CSS Custom Properties (Variables)

third_party/WebKit/Source/core/css/CSSPrimitiveValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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.
  *
@@ skipping 20 matching lines @@
 #include "wtf/Forward.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/StringHash.h"
 
 namespace blink {
 
 class CSSBasicShape;
 class CSSCalcValue;
 class CSSToLengthConversionData;
+class CSSVariableData;
 class Length;
 class RGBColor;
 class ComputedStyle;
 
 // Dimension calculations are imprecise, often resulting in values of e.g.
 // 44.99998. We need to go ahead and round if we're really close to the next
 // integer value.
 template<typename T> inline T roundForImpreciseConversion(double value)
 {
     value += (value < 0) ? -0.01 : +0.01;
@@ skipping 57 matching lines @@
         String,
         PropertyID,
         ValueID,
 
         // This value is used to handle quirky margins in reflow roots (body, td, and th) like WinIE.
         // The basic idea is that a stylesheet can use the value __qem (for quirky em) instead of em.
         // When the quirky value is used, if you're in quirks mode, the margin will collapse away
         // inside a table cell. This quirk is specified in the HTML spec but our impl is different.
         // TODO: Remove this. crbug.com/443952
         QuirkyEms,
+        VariableReference,

[Timothy Loh, 2015/09/30 02:09:27]

I think we aren't adding any more random types to CSSPrimitiveValue (see
crbug.com/523893), so this should be a separate class too.

     };
 
     enum LengthUnitType {
         UnitTypePixels = 0,
         UnitTypePercentage,
         UnitTypeFontSize,
         UnitTypeFontXSize,
         UnitTypeRootFontSize,
         UnitTypeZeroCharacterWidth,
         UnitTypeViewportWidth,
@@ skipping 55 matching lines @@
     bool isNumber() const { return typeWithCalcResolved() == UnitType::Number || typeWithCalcResolved() == UnitType::Integer; }
     bool isPercentage() const { return typeWithCalcResolved() == UnitType::Percentage; }
     bool isPropertyID() const { return type() == UnitType::PropertyID; }
     bool isPx() const { return typeWithCalcResolved() == UnitType::Pixels; }
     bool isRGBColor() const { return type() == UnitType::RGBColor; }
     bool isShape() const { return type() == UnitType::Shape; }
     bool isString() const { return type() == UnitType::String; }
     bool isTime() const { return type() == UnitType::Seconds || type() == UnitType::Milliseconds; }
     bool isURI() const { return type() == UnitType::URI; }
     bool isCalculated() const { return type() == UnitType::Calc; }
+    bool isVariableReference() const { return type() == UnitType::VariableReference; }
     bool isCalculatedPercentageWithNumber() const { return typeWithCalcResolved() == UnitType::CalcPercentageWithNumber; }
     bool isCalculatedPercentageWithLength() const { return typeWithCalcResolved() == UnitType::CalcPercentageWithLength; }
     static bool isDotsPerInch(UnitType type) { return type == UnitType::DotsPerInch; }
     static bool isDotsPerPixel(UnitType type) { return type == UnitType::DotsPerPixel; }
     static bool isDotsPerCentimeter(UnitType type) { return type == UnitType::DotsPerCentimeter; }
     static bool isResolution(UnitType type) { return type >= UnitType::DotsPerPixel && type <= UnitType::DotsPerCentimeter; }
     bool isFlex() const { return typeWithCalcResolved() == UnitType::Fraction; }
     bool isValueID() const { return type() == UnitType::ValueID; }
     bool colorIsDerivedFromElement() const;
 
@@ skipping 46 matching lines @@
     int getIntValue() const { return getValue<int>(); }
     template<typename T> inline T getValue() const { return clampTo<T>(getDoubleValue()); }
 
     String getStringValue() const;
     RGBA32 getRGBA32Value() const { ASSERT(isRGBColor()); return m_value.rgbcolor; }
 
     CSSBasicShape* getShapeValue() const { ASSERT(isShape()); return m_value.shape; }
     CSSCalcValue* cssCalcValue() const { ASSERT(isCalculated()); return m_value.calc; }
     CSSPropertyID getPropertyID() const { ASSERT(isPropertyID()); return m_value.propertyID; }
 
+    CSSVariableData* getVariableDataValue() const
+    {
+        ASSERT(type() == UnitType::VariableReference);
+        return m_value.variableData;
+    }
+
     CSSValueID getValueID() const { return type() == UnitType::ValueID ? m_value.valueID : CSSValueInvalid; }
 
     template<typename T> inline operator T() const; // Defined in CSSPrimitiveValueMappings.h
 
     static const char* unitTypeToString(UnitType);
     String customCSSText() const;
 
     bool equals(const CSSPrimitiveValue&) const;
 
     DECLARE_TRACE_AFTER_DISPATCH();
@@ skipping 27 matching lines @@
     }
 
     static void create(int); // compile-time guard
     static void create(unsigned); // compile-time guard
     template<typename T> operator T*(); // compile-time guard
 
     void init(UnitType);
     void init(const Length&);
     void init(PassRefPtrWillBeRawPtr<CSSBasicShape>);
     void init(PassRefPtrWillBeRawPtr<CSSCalcValue>);
+    void init(PassRefPtrWillBeRawPtr<CSSVariableData>);
 
     double computeLengthDouble(const CSSToLengthConversionData&) const;
 
     inline UnitType type() const { return static_cast<UnitType>(m_primitiveUnitType); }
 
     union {
         CSSPropertyID propertyID;
         CSSValueID valueID;
         double num;
         StringImpl* string;
         RGBA32 rgbcolor;
         // FIXME: oilpan: Should be members, but no support for members in unions. Just trace the raw ptr for now.
         CSSBasicShape* shape;
         CSSCalcValue* calc;
+        CSSVariableData* variableData;
     } m_value;
 };
 
 using CSSLengthArray = CSSPrimitiveValue::CSSLengthArray;
 using CSSLengthTypeArray = CSSPrimitiveValue::CSSLengthTypeArray;
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
 
 } // namespace blink
 
 #endif // CSSPrimitiveValue_h