Split CSSPrimitiveValue into CSSPrimitiveValue and CSSIdentifierValue

third_party/WebKit/Source/core/css/CSSIdentifierValue.h

+// Copyright 2016 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.
+
+#ifndef CSSIdentifierValue_h
+#define CSSIdentifierValue_h
+
+#include "core/CSSValueKeywords.h"
+#include "core/css/CSSValue.h"
+#include "wtf/TypeTraits.h"
+
+namespace blink {
+
+// CSSIdentifierValue stores CSS value keywords, e.g. 'none', 'auto', 'lower-roman'.
+// TODO(sashab): Rename this class to CSSKeywordValue once it no longer conflicts
+// with CSSOM's CSSKeywordValue class.
+class CORE_EXPORT CSSIdentifierValue : public CSSValue {
+ public:
+  static CSSIdentifierValue* create(CSSValueID);
+
+  // TODO(sashab): Rename this to createFromPlatformValue().
+  template <typename T>
+  static CSSIdentifierValue* create(T value) {
+    static_assert(!std::is_same<T, CSSValueID>::value,
+                  "Do not call create() with a CSSValueID; call "
+                  "createIdentifier() instead");
+    return new CSSIdentifierValue(value);
+  }
+
+  static CSSIdentifierValue* create(const Length& value) {
+    return new CSSIdentifierValue(value);
+  }
+
+  CSSValueID getValueID() const { return m_valueID; }
+
+  String customCSSText() const;
+
+  bool equals(const CSSIdentifierValue& other) const {
+    return m_valueID == other.m_valueID;
+  }
+
+  template <typename T>
+  inline T convertTo() const;  // Defined in CSSPrimitiveValueMappings.h
+
+  DECLARE_TRACE_AFTER_DISPATCH();
+
+ private:
+  explicit CSSIdentifierValue(CSSValueID);
+
+  // TODO(sashab): Remove this function, and update mapping methods to specialize
+  // the create() method instead.
+  template <typename T>
+  CSSIdentifierValue(T);  // Defined in CSSPrimitiveValueMappings.h
+
+  CSSIdentifierValue(const Length&);
+
+  CSSValueID m_valueID;
+};
+
+DEFINE_CSS_VALUE_TYPE_CASTS(CSSIdentifierValue, isIdentifierValue());
+
+}  // namespace blink
+
+#endif  // CSSIdentifierValue_h