Implements CSSPropertyAPI for the paint-order property.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintOrder.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/css/properties/CSSPropertyAPIPaintOrder.h"
+
+#include "core/css/CSSValueList.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIPaintOrder::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  if (range.peek().id() == CSSValueNormal)
+    return CSSPropertyParserHelpers::consumeIdent(range);
+
+  Vector<CSSValueID, 3> paintTypeList;
+  CSSIdentifierValue* fill = nullptr;
+  CSSIdentifierValue* stroke = nullptr;
+  CSSIdentifierValue* markers = nullptr;
+  do {
+    CSSValueID id = range.peek().id();
+    if (id == CSSValueFill && !fill)
+      fill = CSSPropertyParserHelpers::consumeIdent(range);
+    else if (id == CSSValueStroke && !stroke)
+      stroke = CSSPropertyParserHelpers::consumeIdent(range);
+    else if (id == CSSValueMarkers && !markers)
+      markers = CSSPropertyParserHelpers::consumeIdent(range);
+    else
+      return nullptr;
+    paintTypeList.push_back(id);
+  } while (!range.atEnd());
+
+  // After parsing we serialize the paint-order list. Since it is not possible
+  // to pop a last list items from CSSValueList without bigger cost, we create
+  // the list after parsing.
+  CSSValueID firstPaintOrderType = paintTypeList.at(0);
+  CSSValueList* paintOrderList = CSSValueList::createSpaceSeparated();
+  switch (firstPaintOrderType) {
+    case CSSValueFill:
+    case CSSValueStroke:
+      paintOrderList->append(firstPaintOrderType == CSSValueFill ? *fill
+                                                                 : *stroke);
+      if (paintTypeList.size() > 1) {
+        if (paintTypeList.at(1) == CSSValueMarkers)
+          paintOrderList->append(*markers);
+      }
+      break;
+    case CSSValueMarkers:
+      paintOrderList->append(*markers);
+      if (paintTypeList.size() > 1) {
+        if (paintTypeList.at(1) == CSSValueStroke)
+          paintOrderList->append(*stroke);
+      }
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  return paintOrderList;
+}
+
+}  // namespace blink