Parse new circle shape syntax

Source/core/css/CSSParser-in.cpp

Index: Source/core/css/CSSParser-in.cpp
diff --git a/Source/core/css/CSSParser-in.cpp b/Source/core/css/CSSParser-in.cpp
index 132b74d87b4636fc05205c29bf99b1fae646f71b..98689989b10e78d214f4559be623ce84e5ab1862 100755
--- a/Source/core/css/CSSParser-in.cpp
+++ b/Source/core/css/CSSParser-in.cpp
@@ -5157,15 +5157,73 @@ PassRefPtr<CSSBasicShape> CSSParser::parseBasicShapeInsetRectangle(CSSParserValu
     return shape;
 }
 
+PassRefPtr<CSSPrimitiveValue> CSSParser::parseShapeRadius(CSSParserValue* value)
+{
+    if (value->id == CSSValueClosestSide || value->id == CSSValueFarthestSide)
+        return cssValuePool().createIdentifierValue(value->id);
+
+    if (!validUnit(value, FLength | FPercent | FNonNeg))
+        return 0;
+
+    return createPrimitiveNumericValue(value);
+}
+
 PassRefPtr<CSSBasicShape> CSSParser::parseBasicShapeCircle(CSSParserValueList* args)
 {
     ASSERT(args);
 
+    // circle(radius)
+    // circle(radius at <position>
+    // circle(at <position>)
+    // where position defines centerX and centerY using a CSS <position> data type.
+    RefPtr<CSSBasicShapeCircle> shape = CSSBasicShapeCircle::create();
+
+    for (CSSParserValue* argument = args->current(); argument; argument = args->next()) {
+        // The call to parseFillPosition below should consume all of the
+        // arguments except the first two. Thus, and index greater than one
+        // indicates an invalid production.
+        if (args->currentIndex() > 1)
+            return 0;
+
+        if (!args->currentIndex() && argument->id != CSSValueAt) {
+            if (RefPtr<CSSPrimitiveValue> radius = parseShapeRadius(argument)) {
+                shape->setRadius(radius);
+                continue;
+            }
+
+            return 0;
+        }
+
+        if (argument->id == CSSValueAt) {
+            RefPtr<CSSValue> centerX;
+            RefPtr<CSSValue> centerY;
+            args->next(); // set list to start of position center
+            parseFillPosition(args, centerX, centerY);
+            if (centerX && centerY) {
+                ASSERT(centerX->isPrimitiveValue());
+                ASSERT(centerY->isPrimitiveValue());
+                shape->setCenterX(toCSSPrimitiveValue(centerX.get()));
+                shape->setCenterY(toCSSPrimitiveValue(centerY.get()));
+            } else {
+                return 0;
+            }
+        } else {
+            return 0;
+        }
+    }
+
+    return shape;
+}
+
+PassRefPtr<CSSBasicShape> CSSParser::parseDeprecatedBasicShapeCircle(CSSParserValueList* args)
+{
+    ASSERT(args);
+
     // circle(centerX, centerY, radius)
     if (args->size() != 5)
         return 0;
 
-    RefPtr<CSSBasicShapeCircle> shape = CSSBasicShapeCircle::create();
+    RefPtr<CSSDeprecatedBasicShapeCircle> shape = CSSDeprecatedBasicShapeCircle::create();
 
     unsigned argumentNumber = 0;
     CSSParserValue* argument = args->current();
@@ -5324,6 +5382,20 @@ static bool isBoxValue(CSSValueID valueId)
     return false;
 }
 
+// FIXME This function is temporary to allow for an orderly transition between
+// the new CSS Shapes circle and ellipse syntax. It will be removed when the
+// old syntax is removed.
+static bool isDeprecatedBasicShape(CSSParserValueList* args)
+{
+    for (unsigned i = args->currentIndex(); i < args->size(); ++i) {
+        CSSParserValue* value = args->valueAt(i);
+        if (isComma(value))
+            return true;
+    }
+
+    return false;
+}
+
 PassRefPtr<CSSValue> CSSParser::parseShapeProperty(CSSPropertyID propId)
 {
     if (!RuntimeEnabledFeatures::cssShapesEnabled())
@@ -5396,7 +5468,10 @@ PassRefPtr<CSSPrimitiveValue> CSSParser::parseBasicShape()
     if (equalIgnoringCase(value->function->name, "rectangle("))
         shape = parseBasicShapeRectangle(args);
     else if (equalIgnoringCase(value->function->name, "circle("))
-        shape = parseBasicShapeCircle(args);
+        if (isDeprecatedBasicShape(args))
+            shape = parseDeprecatedBasicShapeCircle(args);
+        else
+            shape = parseBasicShapeCircle(args);
     else if (equalIgnoringCase(value->function->name, "ellipse("))
         shape = parseBasicShapeEllipse(args);
     else if (equalIgnoringCase(value->function->name, "polygon("))