CSS Motion Path: Support parsing of ray(<angle>) paths

third_party/WebKit/Source/core/css/CSSRayValue.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/CSSRayValue.h"
+
+#include "core/css/CSSIdentifierValue.h"
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSValueList.h"
+#include "platform/wtf/text/StringBuilder.h"
+
+namespace blink {
+
+CSSRayValue* CSSRayValue::Create(CSSValueList* arguments) {
+  return new CSSRayValue(arguments);
+}
+
+CSSRayValue::CSSRayValue(CSSValueList* arguments) : CSSValue(kRayClass) {
+  for (auto& member : *arguments) {
+    if (member->IsPrimitiveValue()) {
+      angle_ = ToCSSPrimitiveValue(member.Get());
+      continue;
+    }
+    const CSSIdentifierValue* identifier = ToCSSIdentifierValue(member.Get());
+    if (identifier->GetValueID() == CSSValueContain)
+      contain_ = identifier;
+    else
+      size_ = identifier;
+  }
+  DCHECK(angle_);
+  DCHECK(size_);
+  // contain_ is optional.
+}
+
+String CSSRayValue::CustomCSSText() const {
+  StringBuilder result;
+  result.Append("ray(");
+  result.Append(angle_->CssText());
+  result.Append(' ');
+  result.Append(size_->CssText());
+  if (contain_) {
+    result.Append(' ');
+    result.Append(contain_->CssText());
+  }
+  result.Append(')');
+  return result.ToString();
+}
+
+bool CSSRayValue::Equals(const CSSRayValue& other) const {
+  return DataEquivalent(angle_, other.angle_) &&
+         DataEquivalent(size_, other.size_) &&
+         DataEquivalent(contain_, other.contain_);
+}
+
+DEFINE_TRACE_AFTER_DISPATCH(CSSRayValue) {
+  visitor->Trace(angle_);
+  visitor->Trace(size_);
+  visitor->Trace(contain_);
+  CSSValue::TraceAfterDispatch(visitor);
+}
+
+}  // namespace blink