Add base::Value::GetTypeName().

base/values.cc

 // Copyright (c) 2012 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 "base/values.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <cmath>
 #include <ostream>
 #include <utility>
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 
 namespace base {
 
 namespace {
 
+const char* const kTypeNames[] = {"null",   "boolean", "integer",    "double",
+                                  "string", "binary",  "dictionary", "list"};
+static_assert(arraysize(kTypeNames) == Value::TYPE_LIST + 1,
+              "kTypeNames Has Wrong Size");
+
 std::unique_ptr<Value> CopyWithoutEmptyChildren(const Value& node);
 
 // Make a deep copy of |node|, but don't include empty lists or dictionaries
 // in the copy. It's possible for this function to return NULL and it
 // expects |node| to always be non-NULL.
 std::unique_ptr<ListValue> CopyListWithoutEmptyChildren(const ListValue& list) {
   std::unique_ptr<ListValue> copy;
   for (const auto& entry : list) {
     std::unique_ptr<Value> child_copy = CopyWithoutEmptyChildren(*entry);
     if (child_copy) {
@@ skipping 36 matching lines @@
 }  // namespace
 
 Value::~Value() {
 }
 
 // static
 std::unique_ptr<Value> Value::CreateNullValue() {
   return WrapUnique(new Value(TYPE_NULL));
 }
 
+// static
+const char* Value::GetTypeName(Value::Type type) {
+  return kTypeNames[type];

[dcheng, 2016/07/15 07:05:12]

Or perhaps just DCHECK(type < arraysize(kTypeNames)) here.

[Lei Zhang, 2016/07/15 07:34:10]

Done.

+}
+
 bool Value::GetAsBinary(const BinaryValue** out_value) const {
   return false;
 }
 
 bool Value::GetAsBoolean(bool* out_value) const {
   return false;
 }
 
 bool Value::GetAsInteger(int* out_value) const {
   return false;
@@ skipping 1070 matching lines @@
 ValueDeserializer::~ValueDeserializer() {
 }
 
 std::ostream& operator<<(std::ostream& out, const Value& value) {
   std::string json;
   JSONWriter::WriteWithOptions(value, JSONWriter::OPTIONS_PRETTY_PRINT, &json);
   return out << json;
 }
 
 }  // namespace base