Move string-related runtime functions into separate files.

src/runtime/runtime-json.cc

+// Copyright 2014 the V8 project 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 "src/v8.h"
+
+#include "src/arguments.h"
+#include "src/json-parser.h"
+#include "src/json-stringifier.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+RUNTIME_FUNCTION(Runtime_QuoteJSONString) {
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
+  DCHECK(args.length() == 1);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, BasicJsonStringifier::StringifyString(isolate, string));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_BasicJSONStringify) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  BasicJsonStringifier stringifier(isolate);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     stringifier.Stringify(object));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_ParseJson) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, source, 0);
+
+  source = String::Flatten(source);
+  // Optimized fast case where we only have Latin1 characters.
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     source->IsSeqOneByteString()
+                                         ? JsonParser<true>::Parse(source)
+                                         : JsonParser<false>::Parse(source));
+  return *result;
+}
+}
+}  // namespace v8::internal