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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 /** | 5 /** |
6 * Support for interoperating with JavaScript. | 6 * Support for interoperating with JavaScript. |
7 * | 7 * |
8 * This library provides access to JavaScript objects from Dart, allowing | 8 * This library provides access to JavaScript objects from Dart, allowing |
9 * Dart code to get and set properties, and call methods of JavaScript objects | 9 * Dart code to get and set properties, and call methods of JavaScript objects |
10 * and invoke JavaScript functions. The library takes care of converting | 10 * and invoke JavaScript functions. The library takes care of converting |
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85 * | 85 * |
86 * var jsArray = new JsObject.jsify([1, 2, 3]); | 86 * var jsArray = new JsObject.jsify([1, 2, 3]); |
87 */ | 87 */ |
88 library dart.js; | 88 library dart.js; |
89 | 89 |
90 import 'dart:html' show Blob, Event, ImageData, Node, Window; | 90 import 'dart:html' show Blob, Event, ImageData, Node, Window; |
91 import 'dart:collection' show HashMap, ListMixin; | 91 import 'dart:collection' show HashMap, ListMixin; |
92 import 'dart:indexed_db' show KeyRange; | 92 import 'dart:indexed_db' show KeyRange; |
93 import 'dart:typed_data' show TypedData; | 93 import 'dart:typed_data' show TypedData; |
94 | 94 |
95 import 'dart:_foreign_helper' show JS, DART_CLOSURE_TO_JS; | 95 import 'dart:_foreign_helper' show JS, JS_CONST, DART_CLOSURE_TO_JS; |
96 import 'dart:_interceptors' show JavaScriptObject, UnknownJavaScriptObject; | 96 import 'dart:_interceptors' |
97 import 'dart:_js_helper' show Primitives, convertDartClosureToJS, | 97 show JavaScriptObject, UnknownJavaScriptObject, DART_CLOSURE_PROPERTY_NAME; |
98 getIsolateAffinityTag; | 98 import 'dart:_js_helper' |
99 show Primitives, convertDartClosureToJS, getIsolateAffinityTag; | |
100 | |
101 export 'dart:_interceptors' show JavaScriptObject; | |
99 | 102 |
100 final JsObject context = _wrapToDart(JS('', 'self')); | 103 final JsObject context = _wrapToDart(JS('', 'self')); |
101 | 104 |
102 _convertDartFunction(Function f, {bool captureThis: false}) { | 105 _convertDartFunction(Function f, {bool captureThis: false}) { |
103 return JS('', | 106 return JS( |
104 'function(_call, f, captureThis) {' | 107 '', |
sra1
2015/10/01 20:55:29
fix indentation
return JS('', r'''
functi
Jacob
2015/10/02 20:08:16
made the indentation beautiful
| |
108 'function(_call, f, captureThis) {' | |
105 'return function() {' | 109 'return function() {' |
106 'return _call(f, captureThis, this, ' | 110 'return _call(f, captureThis, this, ' |
107 'Array.prototype.slice.apply(arguments));' | 111 'Array.prototype.slice.apply(arguments));' |
108 '}' | 112 '}' |
109 '}(#, #, #)', DART_CLOSURE_TO_JS(_callDartFunction), f, captureThis); | 113 '}(#, #, #)', |
114 DART_CLOSURE_TO_JS(_callDartFunction), | |
115 f, | |
116 captureThis); | |
110 } | 117 } |
111 | 118 |
112 _callDartFunction(callback, bool captureThis, self, List arguments) { | 119 _callDartFunction(callback, bool captureThis, self, List arguments) { |
113 if (captureThis) { | 120 if (captureThis) { |
114 arguments = [self]..addAll(arguments); | 121 arguments = [self]..addAll(arguments); |
115 } | 122 } |
116 var dartArgs = new List.from(arguments.map(_convertToDart)); | 123 var dartArgs = new List.from(arguments.map(_convertToDart)); |
117 return _convertToJS(Function.apply(callback, dartArgs)); | 124 return _convertToJS(Function.apply(callback, dartArgs)); |
118 } | 125 } |
119 | 126 |
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205 * | 212 * |
206 * Use this constructor only if you wish to get access to JavaScript | 213 * Use this constructor only if you wish to get access to JavaScript |
207 * properties attached to a browser host object, such as a Node or Blob, that | 214 * properties attached to a browser host object, such as a Node or Blob, that |
208 * is normally automatically converted into a native Dart object. | 215 * is normally automatically converted into a native Dart object. |
209 * | 216 * |
210 * An exception will be thrown if [object] either is `null` or has the type | 217 * An exception will be thrown if [object] either is `null` or has the type |
211 * `bool`, `num`, or `String`. | 218 * `bool`, `num`, or `String`. |
212 */ | 219 */ |
213 factory JsObject.fromBrowserObject(object) { | 220 factory JsObject.fromBrowserObject(object) { |
214 if (object is num || object is String || object is bool || object == null) { | 221 if (object is num || object is String || object is bool || object == null) { |
215 throw new ArgumentError( | 222 throw new ArgumentError("object cannot be a num, string, bool, or null"); |
216 "object cannot be a num, string, bool, or null"); | |
217 } | 223 } |
218 return _wrapToDart(_convertToJS(object)); | 224 return _wrapToDart(_convertToJS(object)); |
219 } | 225 } |
220 | 226 |
221 /** | 227 /** |
222 * Recursively converts a JSON-like collection of Dart objects to a | 228 * Recursively converts a JSON-like collection of Dart objects to a |
223 * collection of JavaScript objects and returns a [JsObject] proxy to it. | 229 * collection of JavaScript objects and returns a [JsObject] proxy to it. |
224 * | 230 * |
225 * [object] must be a [Map] or [Iterable], the contents of which are also | 231 * [object] must be a [Map] or [Iterable], the contents of which are also |
226 * converted. Maps and Iterables are copied to a new JavaScript object. | 232 * converted. Maps and Iterables are copied to a new JavaScript object. |
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260 | 266 |
261 return _convert(data); | 267 return _convert(data); |
262 } | 268 } |
263 | 269 |
264 /** | 270 /** |
265 * Returns the value associated with [property] from the proxied JavaScript | 271 * Returns the value associated with [property] from the proxied JavaScript |
266 * object. | 272 * object. |
267 * | 273 * |
268 * The type of [property] must be either [String] or [num]. | 274 * The type of [property] must be either [String] or [num]. |
269 */ | 275 */ |
270 dynamic operator[](property) { | 276 dynamic operator [](property) { |
271 if (property is! String && property is! num) { | 277 if (property is! String && property is! num) { |
272 throw new ArgumentError("property is not a String or num"); | 278 throw new ArgumentError("property is not a String or num"); |
273 } | 279 } |
274 return _convertToDart(JS('', '#[#]', _jsObject, property)); | 280 return _convertToDart(JS('', '#[#]', _jsObject, property)); |
275 } | 281 } |
276 | 282 |
277 /** | 283 /** |
278 * Sets the value associated with [property] on the proxied JavaScript | 284 * Sets the value associated with [property] on the proxied JavaScript |
279 * object. | 285 * object. |
280 * | 286 * |
281 * The type of [property] must be either [String] or [num]. | 287 * The type of [property] must be either [String] or [num]. |
282 */ | 288 */ |
283 operator[]=(property, value) { | 289 operator []=(property, value) { |
284 if (property is! String && property is! num) { | 290 if (property is! String && property is! num) { |
285 throw new ArgumentError("property is not a String or num"); | 291 throw new ArgumentError("property is not a String or num"); |
286 } | 292 } |
287 JS('', '#[#]=#', _jsObject, property, _convertToJS(value)); | 293 JS('', '#[#]=#', _jsObject, property, _convertToJS(value)); |
288 } | 294 } |
289 | 295 |
290 int get hashCode => 0; | 296 int get hashCode => 0; |
291 | 297 |
292 bool operator==(other) => other is JsObject && | 298 bool operator ==(other) => |
293 JS('bool', '# === #', _jsObject, other._jsObject); | 299 other is JsObject && JS('bool', '# === #', _jsObject, other._jsObject); |
294 | 300 |
295 /** | 301 /** |
296 * Returns `true` if the JavaScript object contains the specified property | 302 * Returns `true` if the JavaScript object contains the specified property |
297 * either directly or though its prototype chain. | 303 * either directly or though its prototype chain. |
298 * | 304 * |
299 * This is the equivalent of the `in` operator in JavaScript. | 305 * This is the equivalent of the `in` operator in JavaScript. |
300 */ | 306 */ |
301 bool hasProperty(property) { | 307 bool hasProperty(property) { |
302 if (property is! String && property is! num) { | 308 if (property is! String && property is! num) { |
303 throw new ArgumentError("property is not a String or num"); | 309 throw new ArgumentError("property is not a String or num"); |
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325 bool instanceof(JsFunction type) { | 331 bool instanceof(JsFunction type) { |
326 return JS('bool', '# instanceof #', _jsObject, _convertToJS(type)); | 332 return JS('bool', '# instanceof #', _jsObject, _convertToJS(type)); |
327 } | 333 } |
328 | 334 |
329 /** | 335 /** |
330 * Returns the result of the JavaScript objects `toString` method. | 336 * Returns the result of the JavaScript objects `toString` method. |
331 */ | 337 */ |
332 String toString() { | 338 String toString() { |
333 try { | 339 try { |
334 return JS('String', 'String(#)', _jsObject); | 340 return JS('String', 'String(#)', _jsObject); |
335 } catch(e) { | 341 } catch (e) { |
336 return super.toString(); | 342 return super.toString(); |
337 } | 343 } |
338 } | 344 } |
339 | 345 |
340 /** | 346 /** |
341 * Calls [method] on the JavaScript object with the arguments [args] and | 347 * Calls [method] on the JavaScript object with the arguments [args] and |
342 * returns the result. | 348 * returns the result. |
343 * | 349 * |
344 * The type of [method] must be either [String] or [num]. | 350 * The type of [method] must be either [String] or [num]. |
345 */ | 351 */ |
346 dynamic callMethod(method, [List args]) { | 352 dynamic callMethod(method, [List args]) { |
347 if (method is! String && method is! num) { | 353 if (method is! String && method is! num) { |
348 throw new ArgumentError("method is not a String or num"); | 354 throw new ArgumentError("method is not a String or num"); |
349 } | 355 } |
350 return _convertToDart(JS('', '#[#].apply(#, #)', _jsObject, method, | 356 return _convertToDart(JS( |
357 '', | |
358 '#[#].apply(#, #)', | |
359 _jsObject, | |
360 method, | |
351 _jsObject, | 361 _jsObject, |
352 args == null ? null : new List.from(args.map(_convertToJS)))); | 362 args == null ? null : new List.from(args.map(_convertToJS)))); |
353 } | 363 } |
354 } | 364 } |
355 | 365 |
356 /** | 366 /** |
357 * Proxies a JavaScript Function object. | 367 * Proxies a JavaScript Function object. |
358 */ | 368 */ |
359 class JsFunction extends JsObject { | 369 class JsFunction extends JsObject { |
360 | |
361 /** | 370 /** |
362 * Returns a [JsFunction] that captures its 'this' binding and calls [f] | 371 * Returns a [JsFunction] that captures its 'this' binding and calls [f] |
363 * with the value of this passed as the first argument. | 372 * with the value of this passed as the first argument. |
364 */ | 373 */ |
365 factory JsFunction.withThis(Function f) { | 374 factory JsFunction.withThis(Function f) { |
366 var jsFunc = _convertDartFunction(f, captureThis: true); | 375 var jsFunc = _convertDartFunction(f, captureThis: true); |
367 return new JsFunction._fromJs(jsFunc); | 376 return new JsFunction._fromJs(jsFunc); |
368 } | 377 } |
369 | 378 |
370 JsFunction._fromJs(jsObject) : super._fromJs(jsObject); | 379 JsFunction._fromJs(jsObject) : super._fromJs(jsObject); |
371 | 380 |
372 /** | 381 /** |
373 * Invokes the JavaScript function with arguments [args]. If [thisArg] is | 382 * Invokes the JavaScript function with arguments [args]. If [thisArg] is |
374 * supplied it is the value of `this` for the invocation. | 383 * supplied it is the value of `this` for the invocation. |
375 */ | 384 */ |
376 dynamic apply(List args, { thisArg }) => | 385 dynamic apply(List args, {thisArg}) => _convertToDart(JS( |
377 _convertToDart(JS('', '#.apply(#, #)', _jsObject, | 386 '', |
378 _convertToJS(thisArg), | 387 '#.apply(#, #)', |
379 args == null ? null : new List.from(args.map(_convertToJS)))); | 388 _jsObject, |
389 _convertToJS(thisArg), | |
390 args == null ? null : new List.from(args.map(_convertToJS)))); | |
380 } | 391 } |
381 | 392 |
382 /** | 393 /** |
383 * A [List] that proxies a JavaScript array. | 394 * A [List] that proxies a JavaScript array. |
384 */ | 395 */ |
385 class JsArray<E> extends JsObject with ListMixin<E> { | 396 class JsArray<E> extends JsObject with ListMixin<E> { |
386 | |
387 /** | 397 /** |
388 * Creates a new JavaScript array. | 398 * Creates a new JavaScript array. |
389 */ | 399 */ |
390 JsArray() : super._fromJs([]); | 400 JsArray() : super._fromJs([]); |
391 | 401 |
392 /** | 402 /** |
393 * Creates a new JavaScript array and initializes it to the contents of | 403 * Creates a new JavaScript array and initializes it to the contents of |
394 * [other]. | 404 * [other]. |
395 */ | 405 */ |
396 JsArray.from(Iterable<E> other) | 406 JsArray.from(Iterable<E> other) |
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442 int get length { | 452 int get length { |
443 // Check the length honours the List contract. | 453 // Check the length honours the List contract. |
444 var len = JS('', '#.length', _jsObject); | 454 var len = JS('', '#.length', _jsObject); |
445 // JavaScript arrays have lengths which are unsigned 32-bit integers. | 455 // JavaScript arrays have lengths which are unsigned 32-bit integers. |
446 if (JS('bool', 'typeof # === "number" && (# >>> 0) === #', len, len, len)) { | 456 if (JS('bool', 'typeof # === "number" && (# >>> 0) === #', len, len, len)) { |
447 return JS('int', '#', len); | 457 return JS('int', '#', len); |
448 } | 458 } |
449 throw new StateError('Bad JsArray length'); | 459 throw new StateError('Bad JsArray length'); |
450 } | 460 } |
451 | 461 |
452 void set length(int length) { super['length'] = length; } | 462 void set length(int length) { |
453 | 463 super['length'] = length; |
464 } | |
454 | 465 |
455 // Methods overriden for better performance | 466 // Methods overriden for better performance |
456 | 467 |
457 void add(E value) { | 468 void add(E value) { |
458 callMethod('push', [value]); | 469 callMethod('push', [value]); |
459 } | 470 } |
460 | 471 |
461 void addAll(Iterable<E> iterable) { | 472 void addAll(Iterable<E> iterable) { |
462 var list = (JS('bool', '# instanceof Array', iterable)) | 473 var list = (JS('bool', '# instanceof Array', iterable)) |
463 ? iterable | 474 ? iterable |
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496 | 507 |
497 void sort([int compare(E a, E b)]) { | 508 void sort([int compare(E a, E b)]) { |
498 // Note: arr.sort(null) is a type error in FF | 509 // Note: arr.sort(null) is a type error in FF |
499 callMethod('sort', compare == null ? [] : [compare]); | 510 callMethod('sort', compare == null ? [] : [compare]); |
500 } | 511 } |
501 } | 512 } |
502 | 513 |
503 // property added to a Dart object referencing its JS-side DartObject proxy | 514 // property added to a Dart object referencing its JS-side DartObject proxy |
504 final String _DART_OBJECT_PROPERTY_NAME = | 515 final String _DART_OBJECT_PROPERTY_NAME = |
505 getIsolateAffinityTag(r'_$dart_dartObject'); | 516 getIsolateAffinityTag(r'_$dart_dartObject'); |
506 final String _DART_CLOSURE_PROPERTY_NAME = | |
507 getIsolateAffinityTag(r'_$dart_dartClosure'); | |
508 | 517 |
509 // property added to a JS object referencing its Dart-side JsObject proxy | 518 // property added to a JS object referencing its Dart-side JsObject proxy |
510 const _JS_OBJECT_PROPERTY_NAME = r'_$dart_jsObject'; | 519 const _JS_OBJECT_PROPERTY_NAME = r'_$dart_jsObject'; |
511 const _JS_FUNCTION_PROPERTY_NAME = r'$dart_jsFunction'; | 520 const _JS_FUNCTION_PROPERTY_NAME = r'$dart_jsFunction'; |
521 const _JS_FUNCTION_PROPERTY_NAME_CAPTURE_THIS = r'_$dart_jsFunctionCaptureThis'; | |
512 | 522 |
513 bool _defineProperty(o, String name, value) { | 523 bool _defineProperty(o, String name, value) { |
514 if (_isExtensible(o) && | 524 if (_isExtensible(o) && |
515 // TODO(ahe): Calling _hasOwnProperty to work around | 525 // TODO(ahe): Calling _hasOwnProperty to work around |
516 // https://code.google.com/p/dart/issues/detail?id=21331. | 526 // https://code.google.com/p/dart/issues/detail?id=21331. |
517 !_hasOwnProperty(o, name)) { | 527 !_hasOwnProperty(o, name)) { |
518 try { | 528 try { |
519 JS('void', 'Object.defineProperty(#, #, { value: #})', o, name, value); | 529 JS('void', 'Object.defineProperty(#, #, { value: #})', o, name, value); |
520 return true; | 530 return true; |
521 } catch (e) { | 531 } catch (e) { |
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547 dynamic _convertToJS(dynamic o) { | 557 dynamic _convertToJS(dynamic o) { |
548 // Note: we don't write `if (o == null) return null;` to make sure dart2js | 558 // Note: we don't write `if (o == null) return null;` to make sure dart2js |
549 // doesn't convert `return null;` into `return;` (which would make `null` be | 559 // doesn't convert `return null;` into `return;` (which would make `null` be |
550 // `undefined` in Javascprit). See dartbug.com/20305 for details. | 560 // `undefined` in Javascprit). See dartbug.com/20305 for details. |
551 if (o == null || o is String || o is num || o is bool) { | 561 if (o == null || o is String || o is num || o is bool) { |
552 return o; | 562 return o; |
553 } | 563 } |
554 if (o is JsObject) { | 564 if (o is JsObject) { |
555 return o._jsObject; | 565 return o._jsObject; |
556 } | 566 } |
557 if (o is Blob || o is Event || o is KeyRange || o is ImageData || o is Node || | 567 if (o is Blob || |
558 o is TypedData || o is Window) { | 568 o is Event || |
569 o is KeyRange || | |
570 o is ImageData || | |
571 o is Node || | |
572 o is TypedData || | |
573 o is Window) { | |
559 return o; | 574 return o; |
560 } | 575 } |
561 if (o is DateTime) { | 576 if (o is DateTime) { |
562 return Primitives.lazyAsJsDate(o); | 577 return Primitives.lazyAsJsDate(o); |
563 } | 578 } |
564 if (o is Function) { | 579 if (o is Function) { |
565 return _getJsProxy(o, _JS_FUNCTION_PROPERTY_NAME, (o) { | 580 return _getJsProxy(o, _JS_FUNCTION_PROPERTY_NAME, (o) { |
566 var jsFunction = _convertDartFunction(o); | 581 var jsFunction = _convertDartFunction(o); |
567 // set a property on the JS closure referencing the Dart closure | 582 // set a property on the JS closure referencing the Dart closure |
568 _defineProperty(jsFunction, _DART_CLOSURE_PROPERTY_NAME, o); | 583 _defineProperty(jsFunction, DART_CLOSURE_PROPERTY_NAME, o); |
569 return jsFunction; | 584 return jsFunction; |
570 }); | 585 }); |
571 } | 586 } |
572 var ctor = _dartProxyCtor; | 587 var ctor = _dartProxyCtor; |
573 return _getJsProxy(o, _JS_OBJECT_PROPERTY_NAME, | 588 return _getJsProxy( |
574 (o) => JS('', 'new #(#)', ctor, o)); | 589 o, _JS_OBJECT_PROPERTY_NAME, (o) => JS('', 'new #(#)', ctor, o)); |
575 } | 590 } |
576 | 591 |
577 Object _getJsProxy(o, String propertyName, createProxy(o)) { | 592 Object _getJsProxy(o, String propertyName, createProxy(o)) { |
578 var jsProxy = _getOwnProperty(o, propertyName); | 593 var jsProxy = _getOwnProperty(o, propertyName); |
579 if (jsProxy == null) { | 594 if (jsProxy == null) { |
580 jsProxy = createProxy(o); | 595 jsProxy = createProxy(o); |
581 _defineProperty(o, propertyName, jsProxy); | 596 _defineProperty(o, propertyName, jsProxy); |
582 } | 597 } |
583 return jsProxy; | 598 return jsProxy; |
584 } | 599 } |
585 | 600 |
586 // converts a Dart object to a reference to a native JS object | 601 // converts a Dart object to a reference to a native JS object |
587 // which might be a DartObject JS->Dart proxy | 602 // which might be a DartObject JS->Dart proxy |
588 Object _convertToDart(o) { | 603 Object _convertToDart(o) { |
589 if (JS('bool', '# == null', o) || | 604 if (JS('bool', '# == null', o) || |
590 JS('bool', 'typeof # == "string"', o) || | 605 JS('bool', 'typeof # == "string"', o) || |
591 JS('bool', 'typeof # == "number"', o) || | 606 JS('bool', 'typeof # == "number"', o) || |
592 JS('bool', 'typeof # == "boolean"', o)) { | 607 JS('bool', 'typeof # == "boolean"', o)) { |
593 return o; | 608 return o; |
594 } else if (_isLocalObject(o) | 609 } else if (_isLocalObject(o) && |
595 && (o is Blob || o is Event || o is KeyRange || o is ImageData | 610 (o is Blob || |
596 || o is Node || o is TypedData || o is Window)) { | 611 o is Event || |
612 o is KeyRange || | |
613 o is ImageData || | |
614 o is Node || | |
615 o is TypedData || | |
616 o is Window)) { | |
597 // long line: dart2js doesn't allow string concatenation in the JS() form | 617 // long line: dart2js doesn't allow string concatenation in the JS() form |
598 return JS('Blob|Event|KeyRange|ImageData|Node|TypedData|Window', '#', o); | 618 return JS('Blob|Event|KeyRange|ImageData|Node|TypedData|Window', '#', o); |
599 } else if (JS('bool', '# instanceof Date', o)) { | 619 } else if (JS('bool', '# instanceof Date', o)) { |
600 var ms = JS('num', '#.getTime()', o); | 620 var ms = JS('num', '#.getTime()', o); |
601 return new DateTime.fromMillisecondsSinceEpoch(ms); | 621 return new DateTime.fromMillisecondsSinceEpoch(ms); |
602 } else if (JS('bool', '#.constructor === #', o, _dartProxyCtor)) { | 622 } else if (JS('bool', '#.constructor === #', o, _dartProxyCtor)) { |
603 return JS('', '#.o', o); | 623 return JS('', '#.o', o); |
604 } else { | 624 } else { |
605 return _wrapToDart(o); | 625 return _wrapToDart(o); |
606 } | 626 } |
607 } | 627 } |
608 | 628 |
609 JsObject _wrapToDart(o) { | 629 JsObject _wrapToDart(o) { |
610 if (JS('bool', 'typeof # == "function"', o)) { | 630 if (JS('bool', 'typeof # == "function"', o)) { |
611 return _getDartProxy(o, _DART_CLOSURE_PROPERTY_NAME, | 631 return _getDartProxy( |
612 (o) => new JsFunction._fromJs(o)); | 632 o, DART_CLOSURE_PROPERTY_NAME, (o) => new JsFunction._fromJs(o)); |
613 } | 633 } |
614 if (JS('bool', '# instanceof Array', o)) { | 634 if (JS('bool', '# instanceof Array', o)) { |
615 return _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME, | 635 return _getDartProxy( |
616 (o) => new JsArray._fromJs(o)); | 636 o, _DART_OBJECT_PROPERTY_NAME, (o) => new JsArray._fromJs(o)); |
617 } | 637 } |
618 return _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME, | 638 return _getDartProxy( |
619 (o) => new JsObject._fromJs(o)); | 639 o, _DART_OBJECT_PROPERTY_NAME, (o) => new JsObject._fromJs(o)); |
620 } | 640 } |
621 | 641 |
622 Object _getDartProxy(o, String propertyName, createProxy(o)) { | 642 Object _getDartProxy(o, String propertyName, createProxy(o)) { |
623 var dartProxy = _getOwnProperty(o, propertyName); | 643 var dartProxy = _getOwnProperty(o, propertyName); |
624 // Temporary fix for dartbug.com/15193 | 644 // Temporary fix for dartbug.com/15193 |
625 // In some cases it's possible to see a JavaScript object that | 645 // In some cases it's possible to see a JavaScript object that |
626 // came from a different context and was previously proxied to | 646 // came from a different context and was previously proxied to |
627 // Dart in that context. The JS object will have a cached proxy | 647 // Dart in that context. The JS object will have a cached proxy |
628 // but it won't be a valid Dart object in this context. | 648 // but it won't be a valid Dart object in this context. |
629 // For now we throw away the cached proxy, but we should be able | 649 // For now we throw away the cached proxy, but we should be able |
630 // to cache proxies from multiple JS contexts and Dart isolates. | 650 // to cache proxies from multiple JS contexts and Dart isolates. |
631 if (dartProxy == null || !_isLocalObject(o)) { | 651 if (dartProxy == null || !_isLocalObject(o)) { |
632 dartProxy = createProxy(o); | 652 dartProxy = createProxy(o); |
633 _defineProperty(o, propertyName, dartProxy); | 653 _defineProperty(o, propertyName, dartProxy); |
634 } | 654 } |
635 return dartProxy; | 655 return dartProxy; |
636 } | 656 } |
657 | |
658 // Start of methods for new style Dart-JS interop. | |
659 | |
660 class _JavaScriptFunctionHack implements Function { | |
661 call( | |
662 [a = const JS_CONST('void 0'), | |
sra1
2015/10/01 20:55:29
probably best to give this a name
const _UNDEFINE
| |
663 b = const JS_CONST('void 0'), | |
664 c = const JS_CONST('void 0'), | |
665 d = const JS_CONST('void 0'), | |
666 e = const JS_CONST('void 0'), | |
667 f = const JS_CONST('void 0'), | |
668 g = const JS_CONST('void 0'), | |
669 h = const JS_CONST('void 0'), | |
670 i = const JS_CONST('void 0'), | |
671 j = const JS_CONST('void 0')]) { | |
672 // Exceedingly slow default implementation. | |
673 return JS('', '#.apply(null, #)', this, | |
674 _stripUndefinedArgs([a, b, c, d, e, f, g, h, i, j])); | |
sra1
2015/10/01 20:55:29
I can't find this function.
Jacob
2015/10/02 20:08:16
arg. clearly I don't have a test case that uses mo
| |
675 } | |
676 } | |
677 | |
678 void _copyOwnProperties(src, dest) { | |
679 JS( | |
680 '', | |
sra1
2015/10/01 20:55:29
Why line-break?
Jacob
2015/10/02 20:08:16
reran the formatter.
| |
681 r"""(function(src, dest) { | |
682 var properties = Object.getOwnPropertyNames(src); | |
683 for (var i = 0, len = properties.length; i < len; i++) { | |
684 var name = properties[i]; | |
685 dest[name] = src[name]; | |
686 } | |
687 })(#, #)""", | |
688 src, | |
689 dest); | |
690 } | |
691 | |
692 // TODO(jacobr): remove this method. So far it appears that specifying the list | |
693 // of registered types in Dart2Js has significant negative code size | |
694 // implications so it is better to specify usage purely based on which | |
695 // libraries are imported. Remove after Dartium is modified to function without | |
696 // requiring this method. | |
697 void registerJsInterfaces([List<Type> types]) { | |
698 // No need to actually register in Dart2JS. | |
699 var fnHackProto = JS('', '#.__proto__', new _JavaScriptFunctionHack()); | |
700 var fnProto = JS('', 'Function.prototype'); | |
701 _copyOwnProperties(fnHackProto, fnProto); | |
702 // Add optimized call methods for small numbers of arguments. | |
703 if (JS('bool', r'#.hasOwnProperty("call$0") ', fnHackProto)) { | |
704 JS('', r'#.call$0 = function() { return this(); }', fnProto); | |
705 JS('', r'#.call$1 = function(a) { return this(a); }', fnProto); | |
706 JS('', r'#.call$2 = function(a, b) { return this(a, b); }', fnProto); | |
707 JS('', r'#.call$3 = function(a, b, c) { return this(a, b, c); }', fnProto); | |
708 JS('', r'#.call$4 = function(a, b, c, d) { return this(a, b, c, d); }', | |
709 fnProto); | |
710 } else { | |
711 if (!JS('bool', r'#.hasOwnProperty("$0") ', fnHackProto)) { | |
712 throw 'Internal error. Unexpected minified output'; | |
713 } | |
714 JS('', r'#.$0 = function() { return this(); }', fnProto); | |
715 JS('', r'#.$1 = function(a) { return this(a); }', fnProto); | |
716 JS('', r'#.$2 = function(a, b) { return this(a, b); }', fnProto); | |
717 JS('', r'#.$3 = function(a, b, c) { return this(a, b, c); }', fnProto); | |
718 JS('', r'#.$4 = function(a, b, c, d) { return this(a, b, c, d); }', | |
719 fnProto); | |
720 } | |
721 } | |
722 | |
723 _convertDartFunctionFast(Function f, {bool captureThis: false}) { | |
sra1
2015/10/01 20:55:29
captureThis is unused
Jacob
2015/10/02 20:08:16
removed
| |
724 var existing = JS('', '#.#', f, _JS_FUNCTION_PROPERTY_NAME); | |
725 if (existing != null) return existing; | |
726 var ret = JS( | |
727 '', | |
728 'function(_call, f) {' | |
sra1
2015/10/01 20:55:29
Use multiline string to fix indentation
Jacob
2015/10/02 20:08:16
Done.
| |
729 'return function() {' | |
730 'return _call(f, Array.prototype.slice.apply(arguments));' | |
731 '}' | |
732 '}(#, #)', | |
733 DART_CLOSURE_TO_JS(_callDartFunctionFast), | |
734 f); | |
735 JS('', '#.# = #', ret, DART_CLOSURE_PROPERTY_NAME, f); | |
736 JS('', '#.# = #', f, _JS_FUNCTION_PROPERTY_NAME, ret); | |
737 return ret; | |
738 } | |
739 | |
740 _convertDartFunctionFastCaptureThis(Function f) { | |
741 var existing = | |
742 JS('', '#.#', f, _JS_FUNCTION_PROPERTY_NAME_CAPTURE_THIS); | |
743 if (existing != null) return existing; | |
744 var ret = JS( | |
745 '', | |
746 'function(_call, f) {' | |
747 'return function() {' | |
748 'return _call(f, this, ' | |
749 'Array.prototype.slice.apply(arguments));' | |
750 '}' | |
751 '}(#, #)', | |
752 DART_CLOSURE_TO_JS(_callDartFunctionFastCaptureThis), | |
753 f); | |
754 JS('', '#.# = #', ret, DART_CLOSURE_PROPERTY_NAME, f); | |
755 JS('', '#.# = #', f, _JS_FUNCTION_PROPERTY_NAME_CAPTURE_THIS, ret); | |
756 return ret; | |
757 } | |
758 | |
759 _callDartFunctionFast(callback, List arguments) { | |
760 return Function.apply(callback, arguments); | |
761 } | |
762 | |
763 _callDartFunctionFastCaptureThis(callback, self, List arguments) { | |
764 return _convertToJS(Function.apply(callback, [self]..addAll(arguments))); | |
765 } | |
766 | |
767 Function allowInterop(Function f) { | |
768 if (JS('bool', 'typeof(#) == "function"', f)) { | |
769 // Already supports interop, just use the existing function. | |
770 return f; | |
771 } else { | |
772 return _convertDartFunctionFast(f); | |
773 } | |
774 } | |
775 | |
776 Function allowInteropCaptureThis(Function f) { | |
777 if (JS('bool', 'typeof(#) == "function"', f)) { | |
778 // Behavior when the function is already a JS function is unspecified. | |
779 throw new ArgumentError( | |
780 "Function is already a JS function so cannot capture this."); | |
781 return f; | |
782 } else { | |
783 return _convertDartFunctionFastCaptureThis(f); | |
784 } | |
785 } | |
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