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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 library dart.js; | 5 library dart.js; |
6 | 6 |
7 import 'dart:_foreign_helper' show JS, DART_CLOSURE_TO_JS; | 7 import 'dart:_foreign_helper' show JS; |
8 import 'dart:_js_helper' show Primitives, convertDartClosureToJS; | 8 import 'dart:_js_helper' show Primitives, convertDartClosureToJS; |
9 | 9 |
10 final JsObject context = new JsObject._fromJs(Primitives.computeGlobalThis()); | 10 final JsObject context = new JsObject._fromJs(Primitives.computeGlobalThis()); |
11 | 11 |
12 JsObject jsify(dynamic data) => data == null ? null : new JsObject._json(data); | 12 JsObject jsify(dynamic data) => data == null ? null : new JsObject._json(data); |
13 | 13 |
14 class Callback implements Serializable<JsFunction> { | 14 class Callback implements Serializable<JsFunction> { |
15 final Function _f; // here to allow capture in closure | 15 final Function _f; // here to allow capture in closure |
16 final bool _withThis; // here to allow capture in closure | 16 final bool _withThis; // here to allow capture in closure |
17 dynamic _jsFunction; | 17 dynamic _jsFunction; |
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32 _call(thisArg, List args) { | 32 _call(thisArg, List args) { |
33 final arguments = new List.from(args); | 33 final arguments = new List.from(args); |
34 if (_withThis) arguments.insert(0, thisArg); | 34 if (_withThis) arguments.insert(0, thisArg); |
35 final dartArgs = arguments.map(_convertToDart).toList(); | 35 final dartArgs = arguments.map(_convertToDart).toList(); |
36 return _convertToJS(Function.apply(_f, dartArgs)); | 36 return _convertToJS(Function.apply(_f, dartArgs)); |
37 } | 37 } |
38 | 38 |
39 JsFunction toJs() => new JsFunction._fromJs(_jsFunction); | 39 JsFunction toJs() => new JsFunction._fromJs(_jsFunction); |
40 } | 40 } |
41 | 41 |
42 /* | |
43 * TODO(justinfagnani): add tests and make public when we remove Callback. | |
44 * | |
45 * Returns a [JsFunction] that captures its 'this' binding and calls [f] | |
46 * with the value of this passed as the first argument. | |
47 */ | |
48 JsFunction _captureThis(Function f) => | |
49 new JsFunction._fromJs(_convertDartFunction(f, captureThis: true)); | |
50 | |
51 _convertDartFunction(Function f, {bool captureThis: false}) { | |
52 return JS('', | |
53 'function(_call, f, captureThis) {' | |
54 'return function() {' | |
55 'return _call(f, captureThis, this, ' | |
56 'Array.prototype.slice.apply(arguments));' | |
57 '}' | |
58 '}(#, #, #)', DART_CLOSURE_TO_JS(_callDartFunction), f, captureThis); | |
59 } | |
60 | |
61 _callDartFunction(callback, bool captureThis, self, List arguments) { | |
62 if (captureThis) { | |
63 arguments = [self]..addAll(arguments); | |
64 } | |
65 var dartArgs = arguments.map(_convertToDart).toList(); | |
66 return _convertToJS(Function.apply(callback, dartArgs)); | |
67 } | |
68 | |
69 | |
70 class JsObject implements Serializable<JsObject> { | 42 class JsObject implements Serializable<JsObject> { |
71 final dynamic _jsObject; | 43 final dynamic _jsObject; |
72 | 44 |
73 JsObject._fromJs(this._jsObject) { | 45 JsObject._fromJs(this._jsObject); |
74 // remember this proxy for the JS object | |
75 _getDartProxy(_jsObject, _DART_OBJECT_PROPERTY_NAME, (o) => this); | |
76 } | |
77 | 46 |
78 // TODO(vsm): Type constructor as Serializable<JsFunction> when | 47 // TODO(vsm): Type constructor as Serializable<JsFunction> when |
79 // dartbug.com/11854 is fixed. | 48 // dartbug.com/11854 is fixed. |
80 factory JsObject(var constructor, [List arguments]) { | 49 factory JsObject(var constructor, [List arguments]) { |
81 final constr = _convertToJS(constructor); | 50 final constr = _convertToJS(constructor); |
82 if (arguments == null) { | 51 if (arguments == null) { |
83 return new JsObject._fromJs(JS('=Object', 'new #()', constr)); | 52 return new JsObject._fromJs(JS('=Object', 'new #()', constr)); |
84 } | 53 } |
85 final args = arguments.map(_convertToJS).toList(); | 54 final args = arguments.map(_convertToJS).toList(); |
86 switch (args.length) { | 55 switch (args.length) { |
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144 return data.map(_convertDataTree).toList(); | 113 return data.map(_convertDataTree).toList(); |
145 } else { | 114 } else { |
146 return _convertToJS(data); | 115 return _convertToJS(data); |
147 } | 116 } |
148 } | 117 } |
149 | 118 |
150 JsObject toJs() => this; | 119 JsObject toJs() => this; |
151 | 120 |
152 operator[](key) => | 121 operator[](key) => |
153 _convertToDart(JS('=Object', '#[#]', _convertToJS(this), key)); | 122 _convertToDart(JS('=Object', '#[#]', _convertToJS(this), key)); |
154 | |
155 operator[]=(key, value) => JS('void', '#[#]=#', _convertToJS(this), key, | 123 operator[]=(key, value) => JS('void', '#[#]=#', _convertToJS(this), key, |
156 _convertToJS(value)); | 124 _convertToJS(value)); |
157 | 125 |
158 int get hashCode => 0; | 126 int get hashCode => 0; |
159 | 127 |
160 operator==(other) => other is JsObject && | 128 operator==(other) => other is JsObject && |
161 JS('bool', '# === #', _convertToJS(this), _convertToJS(other)); | 129 JS('bool', '# === #', _convertToJS(this), _convertToJS(other)); |
162 | 130 |
163 bool hasProperty(String property) => JS('bool', '# in #', property, | 131 bool hasProperty(String property) => JS('bool', '# in #', property, |
164 _convertToJS(this)); | 132 _convertToJS(this)); |
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191 apply(thisArg, [List args]) => | 159 apply(thisArg, [List args]) => |
192 _convertToDart(JS('=Object', '#.apply(#, #)', _convertToJS(this), | 160 _convertToDart(JS('=Object', '#.apply(#, #)', _convertToJS(this), |
193 _convertToJS(thisArg), | 161 _convertToJS(thisArg), |
194 args == null ? null : args.map(_convertToJS).toList())); | 162 args == null ? null : args.map(_convertToJS).toList())); |
195 } | 163 } |
196 | 164 |
197 abstract class Serializable<T> { | 165 abstract class Serializable<T> { |
198 T toJs(); | 166 T toJs(); |
199 } | 167 } |
200 | 168 |
201 // property added to a Dart object referencing its JS-side DartObject proxy | |
202 const _DART_OBJECT_PROPERTY_NAME = r'_$dart_dartObject'; | |
203 const _DART_CLOSURE_PROPERTY_NAME = r'_$dart_dartClosure'; | |
204 | |
205 // property added to a JS object referencing its Dart-side JsObject proxy | |
206 const _JS_OBJECT_PROPERTY_NAME = r'_$dart_jsObject'; | |
207 const _JS_FUNCTION_PROPERTY_NAME = r'$dart_jsFunction'; | |
208 | |
209 _defineProperty(o, String name, value) => | |
210 JS('void', 'Object.defineProperty(#, #, { value: #})', o, name, value); | |
211 | |
212 dynamic _convertToJS(dynamic o) { | 169 dynamic _convertToJS(dynamic o) { |
213 if (o == null) { | 170 if (o == null) { |
214 return null; | 171 return null; |
215 } else if (o is String || o is num || o is bool) { | 172 } else if (o is String || o is num || o is bool) { |
216 return o; | 173 return o; |
217 } else if (o is JsObject) { | 174 } else if (o is JsObject) { |
218 return o._jsObject; | 175 return o._jsObject; |
219 } else if (o is Serializable) { | 176 } else if (o is Serializable) { |
220 return _convertToJS(o.toJs()); | 177 return _convertToJS(o.toJs()); |
221 } else if (o is Function) { | 178 } else if (o is Function) { |
222 return _getJsProxy(o, _JS_FUNCTION_PROPERTY_NAME, (o) { | 179 return _convertToJS(new Callback(o)); |
223 var jsFunction = _convertDartFunction(o); | |
224 // set a property on the JS closure referencing the Dart closure | |
225 _defineProperty(jsFunction, _DART_CLOSURE_PROPERTY_NAME, o); | |
226 return jsFunction; | |
227 }); | |
228 } else { | 180 } else { |
229 return _getJsProxy(o, _JS_OBJECT_PROPERTY_NAME, | 181 return JS('=Object', 'new DartProxy(#)', o); |
230 (o) => JS('', 'new DartObject(#)', o)); | |
231 } | 182 } |
232 } | 183 } |
233 | 184 |
234 dynamic _getJsProxy(o, String propertyName, createProxy(o)) { | |
235 var jsProxy = JS('', '#[#]', o, propertyName); | |
236 if (jsProxy == null) { | |
237 jsProxy = createProxy(o); | |
238 _defineProperty(o, propertyName, jsProxy); | |
239 } | |
240 return jsProxy; | |
241 } | |
242 | |
243 // converts a Dart object to a reference to a native JS object | |
244 // which might be a DartObject JS->Dart proxy | |
245 dynamic _convertToDart(dynamic o) { | 185 dynamic _convertToDart(dynamic o) { |
246 if (JS('bool', '# == null', o)) { | 186 if (JS('bool', '# == null', o)) { |
247 return null; | 187 return null; |
248 } else if (JS('bool', 'typeof # == "string" || # instanceof String', o, o) || | 188 } else if (JS('bool', 'typeof # == "string" || # instanceof String', o, o) || |
249 JS('bool', 'typeof # == "number" || # instanceof Number', o, o) || | 189 JS('bool', 'typeof # == "number" || # instanceof Number', o, o) || |
250 JS('bool', 'typeof # == "boolean" || # instanceof Boolean', o, o)) { | 190 JS('bool', 'typeof # == "boolean" || # instanceof Boolean', o, o)) { |
251 return o; | 191 return o; |
252 } else if (JS('bool', '# instanceof Function', o)) { | 192 } else if (JS('bool', '# instanceof Function', o)) { |
253 return _getDartProxy(o, _DART_CLOSURE_PROPERTY_NAME, | 193 return new JsFunction._fromJs(JS('=Object', '#', o)); |
254 (o) => new JsFunction._fromJs(o)); | 194 } else if (JS('bool', '# instanceof DartProxy', o)) { |
255 } else if (JS('bool', '# instanceof DartObject', o)) { | |
256 return JS('var', '#.o', o); | 195 return JS('var', '#.o', o); |
257 } else { | 196 } else { |
258 return _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME, | 197 return new JsObject._fromJs(JS('=Object', '#', o)); |
259 (o) => new JsObject._fromJs(o)); | |
260 } | 198 } |
261 } | 199 } |
262 | |
263 dynamic _getDartProxy(o, String propertyName, createProxy(o)) { | |
264 var dartProxy = JS('', '#[#]', o, propertyName); | |
265 if (dartProxy == null) { | |
266 dartProxy = createProxy(o); | |
267 _defineProperty(o, propertyName, dartProxy); | |
268 } | |
269 return dartProxy; | |
270 } | |
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