Clone of chromium aad1ce808763f59c7a3753e08f1500a104ecc6fd refs/remotes/origin/HEAD
diff --git a/base/json/json_writer.cc b/base/json/json_writer.cc
new file mode 100644
index 0000000..d14c92c
--- /dev/null
+++ b/base/json/json_writer.cc
@@ -0,0 +1,207 @@
+// 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/json/json_writer.h"
+
+#include <cmath>
+
+#include "base/json/string_escape.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+
+namespace base {
+
+#if defined(OS_WIN)
+const char kPrettyPrintLineEnding[] = "\r\n";
+#else
+const char kPrettyPrintLineEnding[] = "\n";
+#endif
+
+// static
+bool JSONWriter::Write(const Value* const node, std::string* json) {
+ return WriteWithOptions(node, 0, json);
+}
+
+// static
+bool JSONWriter::WriteWithOptions(const Value* const node, int options,
+ std::string* json) {
+ json->clear();
+ // Is there a better way to estimate the size of the output?
+ json->reserve(1024);
+
+ JSONWriter writer(options, json);
+ bool result = writer.BuildJSONString(node, 0U);
+
+ if (options & OPTIONS_PRETTY_PRINT)
+ json->append(kPrettyPrintLineEnding);
+
+ return result;
+}
+
+JSONWriter::JSONWriter(int options, std::string* json)
+ : omit_binary_values_((options & OPTIONS_OMIT_BINARY_VALUES) != 0),
+ omit_double_type_preservation_(
+ (options & OPTIONS_OMIT_DOUBLE_TYPE_PRESERVATION) != 0),
+ pretty_print_((options & OPTIONS_PRETTY_PRINT) != 0),
+ json_string_(json) {
+ DCHECK(json);
+}
+
+bool JSONWriter::BuildJSONString(const Value* const node, size_t depth) {
+ switch (node->GetType()) {
+ case Value::TYPE_NULL: {
+ json_string_->append("null");
+ return true;
+ }
+
+ case Value::TYPE_BOOLEAN: {
+ bool value;
+ bool result = node->GetAsBoolean(&value);
+ DCHECK(result);
+ json_string_->append(value ? "true" : "false");
+ return result;
+ }
+
+ case Value::TYPE_INTEGER: {
+ int value;
+ bool result = node->GetAsInteger(&value);
+ DCHECK(result);
+ json_string_->append(IntToString(value));
+ return result;
+ }
+
+ case Value::TYPE_DOUBLE: {
+ double value;
+ bool result = node->GetAsDouble(&value);
+ DCHECK(result);
+ if (omit_double_type_preservation_ &&
+ value <= kint64max &&
+ value >= kint64min &&
+ std::floor(value) == value) {
+ json_string_->append(Int64ToString(static_cast<int64>(value)));
+ return result;
+ }
+ std::string real = DoubleToString(value);
+ // Ensure that the number has a .0 if there's no decimal or 'e'. This
+ // makes sure that when we read the JSON back, it's interpreted as a
+ // real rather than an int.
+ if (real.find('.') == std::string::npos &&
+ real.find('e') == std::string::npos &&
+ real.find('E') == std::string::npos) {
+ real.append(".0");
+ }
+ // The JSON spec requires that non-integer values in the range (-1,1)
+ // have a zero before the decimal point - ".52" is not valid, "0.52" is.
+ if (real[0] == '.') {
+ real.insert(static_cast<size_t>(0), static_cast<size_t>(1), '0');
+ } else if (real.length() > 1 && real[0] == '-' && real[1] == '.') {
+ // "-.1" bad "-0.1" good
+ real.insert(static_cast<size_t>(1), static_cast<size_t>(1), '0');
+ }
+ json_string_->append(real);
+ return result;
+ }
+
+ case Value::TYPE_STRING: {
+ std::string value;
+ bool result = node->GetAsString(&value);
+ DCHECK(result);
+ EscapeJSONString(value, true, json_string_);
+ return result;
+ }
+
+ case Value::TYPE_LIST: {
+ json_string_->push_back('[');
+ if (pretty_print_)
+ json_string_->push_back(' ');
+
+ const ListValue* list = NULL;
+ bool first_value_has_been_output = false;
+ bool result = node->GetAsList(&list);
+ DCHECK(result);
+ for (ListValue::const_iterator it = list->begin(); it != list->end();
+ ++it) {
+ const Value* value = *it;
+ if (omit_binary_values_ && value->GetType() == Value::TYPE_BINARY)
+ continue;
+
+ if (first_value_has_been_output) {
+ json_string_->push_back(',');
+ if (pretty_print_)
+ json_string_->push_back(' ');
+ }
+
+ if (!BuildJSONString(value, depth))
+ result = false;
+
+ first_value_has_been_output = true;
+ }
+
+ if (pretty_print_)
+ json_string_->push_back(' ');
+ json_string_->push_back(']');
+ return result;
+ }
+
+ case Value::TYPE_DICTIONARY: {
+ json_string_->push_back('{');
+ if (pretty_print_)
+ json_string_->append(kPrettyPrintLineEnding);
+
+ const DictionaryValue* dict = NULL;
+ bool first_value_has_been_output = false;
+ bool result = node->GetAsDictionary(&dict);
+ DCHECK(result);
+ for (DictionaryValue::Iterator itr(*dict); !itr.IsAtEnd();
+ itr.Advance()) {
+ if (omit_binary_values_ &&
+ itr.value().GetType() == Value::TYPE_BINARY) {
+ continue;
+ }
+
+ if (first_value_has_been_output) {
+ json_string_->push_back(',');
+ if (pretty_print_)
+ json_string_->append(kPrettyPrintLineEnding);
+ }
+
+ if (pretty_print_)
+ IndentLine(depth + 1U);
+
+ EscapeJSONString(itr.key(), true, json_string_);
+ json_string_->push_back(':');
+ if (pretty_print_)
+ json_string_->push_back(' ');
+
+ if (!BuildJSONString(&itr.value(), depth + 1U))
+ result = false;
+
+ first_value_has_been_output = true;
+ }
+
+ if (pretty_print_) {
+ json_string_->append(kPrettyPrintLineEnding);
+ IndentLine(depth);
+ }
+
+ json_string_->push_back('}');
+ return result;
+ }
+
+ case Value::TYPE_BINARY:
+ // Successful only if we're allowed to omit it.
+ DLOG_IF(ERROR, !omit_binary_values_) << "Cannot serialize binary value.";
+ return omit_binary_values_;
+ }
+ NOTREACHED();
+ return false;
+}
+
+void JSONWriter::IndentLine(size_t depth) {
+ json_string_->append(depth * 3U, ' ');
+}
+
+} // namespace base
