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