| // 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. |
| |
| library polymer.deserialize; |
| |
| import 'dart:convert' show JSON; |
| |
| final _typeHandlers = { |
| String: (x, _) => x, |
| Null: (x, _) => x, |
| DateTime: (x, def) { |
| // TODO(jmesserly): shouldn't need to try-catch here |
| // See: https://code.google.com/p/dart/issues/detail?id=1878 |
| try { |
| return DateTime.parse(x); |
| } catch (e) { |
| return def; |
| } |
| }, |
| bool: (x, _) => x != 'false', |
| int: (x, def) => int.parse(x, onError: (_) => def), |
| double: (x, def) => double.parse(x, (_) => def), |
| }; |
| |
| /// Convert representation of [value] based on [type] and [currentValue]. |
| Object deserializeValue(String value, Object currentValue, Type type) { |
| var handler = _typeHandlers[type]; |
| if (handler != null) return handler(value, currentValue); |
| |
| try { |
| // If the string is an object, we can parse is with the JSON library. |
| // include convenience replace for single-quotes. If the author omits |
| // quotes altogether, parse will fail. |
| return JSON.decode(value.replaceAll("'", '"')); |
| |
| // TODO(jmesserly): deserialized JSON is not assignable to most objects in |
| // Dart. We should attempt to convert it appropriately. |
| } catch(e) { |
| // The object isn't valid JSON, return the raw value |
| return value; |
| } |
| } |