Index: sdk/lib/_internal/compiler/implementation/lib/json_patch.dart |
diff --git a/sdk/lib/_internal/compiler/implementation/lib/json_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/json_patch.dart |
new file mode 100644 |
index 0000000000000000000000000000000000000000..01cce1a0acf915537b717b57237cf0a44e174cfb |
--- /dev/null |
+++ b/sdk/lib/_internal/compiler/implementation/lib/json_patch.dart |
@@ -0,0 +1,91 @@ |
+// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
+// for details. All rights reserved. Use of this source code is governed by a |
+// BSD-style license that can be found in the LICENSE file. |
+ |
+// Patch file for dart:json library. |
+ |
+import 'dart:_foreign_helper' show JS; |
+ |
+/** |
+ * Parses [json] and builds the corresponding parsed JSON value. |
+ * |
+ * Parsed JSON values are of the types [num], [String], [bool], [Null], |
+ * [List]s of parsed JSON values or [Map]s from [String] to parsed |
+ * JSON values. |
+ * |
+ * The optional [reviver] function, if provided, is called once for each object |
+ * or list property parsed. The arguments are the property name ([String]) or |
+ * list index ([int]), and the value is the parsed value. The return value of |
+ * the reviver will be used as the value of that property instead of the parsed |
+ * value. The top level value is passed to the reviver with the empty string as |
+ * a key. |
+ * |
+ * Throws [FormatException] if the input is not valid JSON text. |
+ */ |
+patch parse(String json, [reviver(var key, var value)]) { |
+ if (json is! String) throw new ArgumentError(json); |
+ |
+ var parsed; |
+ try { |
+ parsed = JS('=Object|=List|Null|bool|num|String', 'JSON.parse(#)', json); |
+ } catch (e) { |
+ throw new FormatException(JS('String', 'String(#)', e)); |
+ } |
+ |
+ return _convertJsonToDart(parsed, reviver); |
+} |
+ |
+/** |
+ * Walks the raw JavaScript value [json], replacing JavaScript Objects with |
+ * Maps. [json] is expected to be freshly allocated so elements can be replaced |
+ * in-place. |
+ */ |
+_convertJsonToDart(json, reviver(key, value)) { |
+ |
+ var revive = reviver == null ? (key, value) => value : reviver; |
+ |
+ walk(e) { |
+ // JavaScript null, string, number, bool are in the correct representation. |
+ if (JS('bool', '# == null', e) || JS('bool', 'typeof # != "object"', e)) { |
+ return e; |
+ } |
+ |
+ // This test is needed to avoid identifing '{"__proto__":[]}' as an Array. |
+ // TODO(sra): Replace this test with cheaper '#.constructor === Array' when |
+ // bug 621 below is fixed. |
+ if (JS('bool', 'Object.getPrototypeOf(#) === Array.prototype', e)) { |
+ var list = JS('=List', '#', e); // Teach compiler the type is known. |
+ // In-place update of the elements since JS Array is a Dart List. |
+ for (int i = 0; i < list.length; i++) { |
+ // Use JS indexing to avoid range checks. We know this is the only |
+ // reference to the list, but the compiler will likely never be able to |
+ // tell that this instance of the list cannot have its length changed by |
+ // the reviver even though it later will be passed to the reviver at the |
+ // outer level. |
+ var item = JS('', '#[#]', list, i); |
+ JS('', '#[#]=#', list, i, revive(i, walk(item))); |
+ } |
+ return list; |
+ } |
+ |
+ // Otherwise it is a plain Object, so copy to a Map. |
+ var keys = JS('=List', 'Object.keys(#)', e); |
+ Map map = {}; |
+ for (int i = 0; i < keys.length; i++) { |
+ String key = keys[i]; |
+ map[key] = revive(key, walk(JS('', '#[#]', e, key))); |
+ } |
+ // V8 has a bug with properties named "__proto__" |
+ // https://code.google.com/p/v8/issues/detail?id=621 |
+ var proto = JS('', '#.__proto__', e); |
+ // __proto__ can be undefined on IE9. |
+ if (JS('bool', |
+ 'typeof # !== "undefined" && # !== Object.prototype', |
+ proto, proto)) { |
+ map['__proto__'] = revive('__proto__', walk(proto)); |
+ } |
+ return map; |
+ } |
+ |
+ return revive('', walk(json)); |
+} |