Skeleton implementation of CSS Properties and Values API

third_party/WebKit/Source/core/css/CSSSyntaxDescriptor.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 CSSSyntaxDescriptor_h
+#define CSSSyntaxDescriptor_h
+
+#include "core/css/parser/CSSParserTokenRange.h"
+
+namespace blink {
+
+class CSSValue;
+
+enum class CSSSyntaxType {
+    TokenStream,
+    Length,
+    // TODO(timloh): Add all the other types
+};
+
+struct CSSSyntaxComponent {
+    CSSSyntaxComponent(CSSSyntaxType type)
+        : m_type(type)
+    {
+    }
+
+    CSSSyntaxType m_type;
+    // TODO(timloh): This will need to support arbitrary idents and list types
+};
+
+class CSSSyntaxDescriptor {
+public:
+    CSSSyntaxDescriptor(String syntax);
+
+    const CSSValue* parse(CSSParserTokenRange) const;
+    const CSSValue* parse(const String&) const;
+    bool isValid() const { return !m_syntaxComponents.isEmpty(); }
+    bool isTokenStream() const { return m_syntaxComponents.size() == 1 && m_syntaxComponents[0].m_type == CSSSyntaxType::TokenStream; }
+
+private:
+    Vector<CSSSyntaxComponent> m_syntaxComponents;
+};
+
+} // namespace blink
+
+#endif // CSSSyntaxDescriptor_h