Split CSSPrimitiveValue into CSSPrimitiveValue and CSSIdentifierValue

third_party/WebKit/Source/core/css/CSSIdentifierValue.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/CSSIdentifierValue.h"
+
+#include "core/css/CSSMarkup.h"
+#include "core/css/CSSValuePool.h"
+#include "platform/Length.h"
+#include "wtf/text/StringBuilder.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+static const AtomicString& valueName(CSSValueID valueID)
+{
+    DCHECK_GE(valueID, 0);
+    DCHECK_LT(valueID, numCSSValueKeywords);
+
+    if (valueID < 0)
+        return nullAtom;
+
+    static AtomicString* keywordStrings = new AtomicString[numCSSValueKeywords]; // Leaked intentionally.
+    AtomicString& keywordString = keywordStrings[valueID];
+    if (keywordString.isNull())
+        keywordString = getValueName(valueID);
+    return keywordString;
+}
+
+CSSIdentifierValue* CSSIdentifierValue::create(CSSValueID valueID)
+{
+    CSSIdentifierValue* cssValue = cssValuePool().identifierCacheValue(valueID);
+    if (!cssValue)
+        cssValue = cssValuePool().setIdentifierCacheValue(valueID, new CSSIdentifierValue(valueID));
+    return cssValue;
+}
+
+String CSSIdentifierValue::customCSSText() const
+{
+    return valueName(m_valueID);
+}
+
+CSSIdentifierValue::CSSIdentifierValue(CSSValueID valueID)
+    : CSSValue(IdentifierClass)
+    , m_valueID(valueID)
+{
+    // TODO(sashab): Add a DCHECK_NE(valueID, CSSValueInvalid) once no code paths
+    // cause this to happen.
+}
+
+CSSIdentifierValue::CSSIdentifierValue(const Length& length)
+    : CSSValue(IdentifierClass)
+{
+    switch (length.type()) {
+    case Auto:
+        m_valueID = CSSValueAuto;
+        break;
+    case MinContent:
+        m_valueID = CSSValueMinContent;
+        break;
+    case MaxContent:
+        m_valueID = CSSValueMaxContent;
+        break;
+    case FillAvailable:
+        m_valueID = CSSValueWebkitFillAvailable;
+        break;
+    case FitContent:
+        m_valueID = CSSValueFitContent;
+        break;
+    case ExtendToZoom:
+        m_valueID = CSSValueInternalExtendToZoom;
+    case Percent:
+    case Fixed:
+    case Calculated:
+    case DeviceWidth:
+    case DeviceHeight:
+    case MaxSizeNone:
+        NOTREACHED();
+        break;
+    }
+}
+
+DEFINE_TRACE_AFTER_DISPATCH(CSSIdentifierValue)
+{
+    CSSValue::traceAfterDispatch(visitor);
+}
+
+} // namespace blink