Revert "Use browsers JSON.parse for parsing JSON."

sdk/lib/_internal/compiler/implementation/lib/json_patch.dart

-// 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++) {
-        list[i] = revive(i, walk(list[i]));
-      }
-      return list;
-    }
-
-    // Otherwise it is a plain Object, so copy to a Map.
-    var keys = JS('=List', 'Object.keys(#)', e);
-    var 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);
-    if (JS('bool', '# !== Object.prototype', proto)) {
-      map['__proto__'] = revive('__proto__', walk(proto));
-    }
-    return map;
-  }
-
-  return revive('', walk(json));
-}