[Typed-OM] Add CSSTokenStreamValue

third_party/WebKit/Source/core/css/cssom/CSSTokenStreamValue.cpp

+// 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.
+
+#include "core/css/cssom/CSSTokenStreamValue.h"
+
+#include "core/css/CSSVariableReferenceValue.h"
+#include "core/css/parser/CSSTokenizer.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+namespace {
+
+class TokenStreamValueIterationSource final : public ValueIterable<String>::IterationSource {
+public:
+    explicit TokenStreamValueIterationSource(CSSTokenStreamValue* tokenStreamValue)
+        : m_tokenStreamValue(tokenStreamValue)
+    {
+    }
+
+    bool next(ScriptState*, String& value, ExceptionState&) override
+    {
+        if (m_index >= m_tokenStreamValue->size())
+            return false;
+        value = m_tokenStreamValue->fragmentAtIndex(m_index);
+        return true;
+    }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        visitor->trace(m_tokenStreamValue);
+        ValueIterable<String>::IterationSource::trace(visitor);
+    }
+
+private:
+    const Member<CSSTokenStreamValue> m_tokenStreamValue;
+};
+
+} // namespace
+
+ValueIterable<String>::IterationSource* CSSTokenStreamValue::startIteration(ScriptState*, ExceptionState&)
+{
+    return new TokenStreamValueIterationSource(this);
+}
+
+CSSValue* CSSTokenStreamValue::toCSSValue() const
+{
+    StringBuilder tokens;
+
+    for (unsigned i = 0; i < m_fragments.size(); i++) {
+        if (i)
+            tokens.append("/**/");
+        tokens.append(m_fragments[i]);
+    }
+
+    CSSTokenizer::Scope scope(tokens.toString());
+
+    return CSSVariableReferenceValue::create(CSSVariableData::create(scope.tokenRange()));
+}
+
+} // namespace blink