Parsing CSS properties for scroll snap points

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 631 matching lines @@
         Length length = StyleBuilderConverter::convertLength(state, pair->second());
         if (pair->first()->getValueID() == cssValueFor0)
             return length;
         ASSERT(pair->first()->getValueID() == cssValueFor100);
         return length.subtractFromOneHundredPercent();
     }
 
     return StyleBuilderConverter::convertLength(state, primitiveValue);
 }
 
-LengthPoint StyleBuilderConverter::convertObjectPosition(StyleResolverState& state, CSSValue* value)
+LengthPoint StyleBuilderConverter::convertPosition(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     Pair* pair = primitiveValue->getPairValue();
     return LengthPoint(
         convertPositionLength<CSSValueLeft, CSSValueRight>(state, pair->first()),
         convertPositionLength<CSSValueTop, CSSValueBottom>(state, pair->second())
     );
 }
 
 static float convertPerspectiveLength(StyleResolverState& state, CSSPrimitiveValue* primitiveValue)
@@ skipping 231 matching lines @@
     CSSPrimitiveValue* primitiveValueY = toCSSPrimitiveValue(list->item(1));
     CSSPrimitiveValue* primitiveValueZ = toCSSPrimitiveValue(list->item(2));
 
     return TransformOrigin(
         convertOriginLength<CSSValueLeft, CSSValueRight>(state, primitiveValueX),
         convertOriginLength<CSSValueTop, CSSValueBottom>(state, primitiveValueY),
         StyleBuilderConverter::convertComputedLength<float>(state, primitiveValueZ)
     );
 }
 
+ScrollSnapPoints StyleBuilderConverter::convertSnapPoints(StyleResolverState& state, CSSValue* value)
+{
+    // Handles: none | repeat(<length>)
+    ScrollSnapPoints points;
+    points.hasRepeat = false;
+
+    if (!value->isFunctionValue())
+        return points;
+
+    CSSFunctionValue* repeatFunction = toCSSFunctionValue(value);
+    ASSERT_WITH_SECURITY_IMPLICATION(repeatFunction->length() == 1);
+    points.repeatOffset = convertLength(state, toCSSPrimitiveValue(repeatFunction->item(0)));
+    points.hasRepeat = true;
+
+    return points;
+}
+
+Vector<LengthPoint> StyleBuilderConverter::convertSnapCoordinates(StyleResolverState& state, CSSValue* value)
+{
+    // Handles: none | <position>#
+    Vector<LengthPoint> coordinates;
+
+    if (!value->isValueList())
+        return coordinates;
+
+    CSSValueList* valueList = toCSSValueList(value);
+    coordinates.reserveInitialCapacity(valueList->length());
+    for (auto& snapCoordinate : *valueList) {
+        coordinates.uncheckedAppend(convertPosition(state, snapCoordinate.get()));
+    }
+
+    return coordinates;
+}
+
 } // namespace blink