CSS Custom Properties (Variables)

Source/core/css/CSSPrimitiveValue.cpp

Index: Source/core/css/CSSPrimitiveValue.cpp
diff --git a/Source/core/css/CSSPrimitiveValue.cpp b/Source/core/css/CSSPrimitiveValue.cpp
index 606a36e4e8f21f6cee51163d50559a86d7f89fce..90ea24c595b4df57693cb4019c1330ed77ee0e60 100644
--- a/Source/core/css/CSSPrimitiveValue.cpp
+++ b/Source/core/css/CSSPrimitiveValue.cpp
@@ -26,6 +26,7 @@
 #include "core/css/CSSHelper.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSToLengthConversionData.h"
+#include "core/css/CSSVariableData.h"
 #include "core/css/Counter.h"
 #include "core/css/Pair.h"
 #include "core/css/Rect.h"
@@ -191,6 +192,7 @@ CSSPrimitiveValue::UnitType CSSPrimitiveValue::primitiveType() const
         return CSS_CALC_PERCENTAGE_WITH_LENGTH;
     case CalcTime:
         return CSS_MS;
+    case CalcVariable: // The type of a calculation containing a variable cannot be known until the value of the variable is determined.
     case CalcOther:
         return CSS_UNKNOWN;
     }
@@ -248,6 +250,15 @@ CSSPrimitiveValue::CSSPrimitiveValue(const String& str, UnitType type)
         m_value.string->ref();
 }
 
+CSSPrimitiveValue::CSSPrimitiveValue(CSSVariableData* variableData)
+    : CSSValue(PrimitiveClass)
+{
+    m_primitiveUnitType = CSSPrimitiveValue::CSS_VARIABLE_REFERENCE;
+    m_value.variableData = variableData;
+    if (m_value.variableData)
+        m_value.variableData->ref();
+}
+
 CSSPrimitiveValue::CSSPrimitiveValue(const LengthSize& lengthSize, const ComputedStyle& style)
     : CSSValue(PrimitiveClass)
 {
@@ -397,6 +408,10 @@ void CSSPrimitiveValue::cleanup()
         if (m_value.string)
             m_value.string->deref();
         break;
+    case CSS_VARIABLE_REFERENCE:
+        if (m_value.variableData)
+            m_value.variableData->deref();
+        break;
     case CSS_COUNTER:
         // We must not call deref() when oilpan is enabled because m_value.counter is traced.
 #if !ENABLE(OILPAN)
@@ -819,6 +834,8 @@ String CSSPrimitiveValue::getStringValue() const
         return valueName(m_value.valueID);
     case CSS_PROPERTY_ID:
         return propertyName(m_value.propertyID);
+    case CSS_VARIABLE_REFERENCE:
+        return m_value.variableData->string();
     default:
         break;
     }
@@ -927,6 +944,7 @@ const char* CSSPrimitiveValue::unitTypeToString(UnitType type)
     case CSS_CALC_PERCENTAGE_WITH_NUMBER:
     case CSS_CALC_PERCENTAGE_WITH_LENGTH:
     case CSS_QEM:
+    case CSS_VARIABLE_REFERENCE:
         break;
     };
     ASSERT_NOT_REACHED();
@@ -1044,6 +1062,9 @@ String CSSPrimitiveValue::customCSSText() const
         case CSS_SHAPE:
             text = m_value.shape->cssText();
             break;
+        case CSS_VARIABLE_REFERENCE:
+            text = "var(" + String(m_value.string) + ")";
+            break;
     }
 
     ASSERT(!cssTextCache().contains(this));
@@ -1096,6 +1117,7 @@ bool CSSPrimitiveValue::equals(const CSSPrimitiveValue& other) const
     case CSS_STRING:
     case CSS_URI:
     case CSS_ATTR:
+    case CSS_VARIABLE_REFERENCE:
         return equal(m_value.string, other.m_value.string);
     case CSS_COUNTER:
         return m_value.counter && other.m_value.counter && m_value.counter->equals(*other.m_value.counter);