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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 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. | |
| 4 | |
| 5 library pub.asset.transformer_isolate; | |
| 6 | |
| 7 import 'dart:convert'; | |
| 8 import 'dart:isolate'; | |
| 9 import 'dart:mirrors'; | |
| 10 | |
| 11 import 'package:barback/barback.dart'; | |
| 12 | |
| 13 import 'serialize.dart'; | |
| 14 | |
| 15 /// The mirror system. | |
| 16 /// | |
| 17 /// Cached to avoid re-instantiating each time a transformer is initialized. | |
| 18 final _mirrors = currentMirrorSystem(); | |
| 19 | |
| 20 /// Sets up the initial communication with the host isolate. | |
| 21 void loadTransformers(SendPort replyTo) { | |
| 22 var port = new ReceivePort(); | |
| 23 replyTo.send(port.sendPort); | |
| 24 port.listen((wrappedMessage) { | |
| 25 // TODO(nweiz): When issue 19228 is fixed, spin up a separate isolate for | |
| 26 // libraries loaded beyond the first so they can run in parallel. | |
| 27 respond(wrappedMessage, (message) { | |
| 28 var configuration = JSON.decode(message['configuration']); | |
| 29 var mode = new BarbackMode(message['mode']); | |
| 30 return _initialize(message['library'], configuration, mode). | |
| 31 map(serializeTransformerLike).toList(); | |
| 32 }); | |
| 33 }); | |
| 34 } | |
| 35 | |
| 36 /// Loads all the transformers and groups defined in [uri]. | |
| 37 /// | |
| 38 /// Loads the library, finds any [Transformer] or [TransformerGroup] subclasses | |
| 39 /// in it, instantiates them with [configuration] and [mode], and returns them. | |
| 40 List _initialize(String uri, Map configuration, BarbackMode mode) { | |
| 41 var transformerClass = reflectClass(Transformer); | |
| 42 var aggregateClass = _aggregateTransformerClass; | |
| 43 var groupClass = reflectClass(TransformerGroup); | |
| 44 | |
| 45 var seen = new Set(); | |
| 46 var transformers = []; | |
| 47 | |
| 48 loadFromLibrary(library) { | |
| 49 if (seen.contains(library)) return; | |
| 50 seen.add(library); | |
| 51 | |
| 52 // Load transformers from libraries exported by [library]. | |
| 53 for (var dependency in library.libraryDependencies) { | |
| 54 if (!dependency.isExport) continue; | |
| 55 loadFromLibrary(dependency.targetLibrary); | |
| 56 } | |
| 57 | |
| 58 // TODO(nweiz): if no valid transformers are found, throw an error message | |
| 59 // describing candidates and why they were rejected. | |
| 60 transformers.addAll(library.declarations.values.map((declaration) { | |
| 61 if (declaration is! ClassMirror) return null; | |
| 62 var classMirror = declaration; | |
| 63 if (classMirror.isPrivate) return null; | |
| 64 if (classMirror.isAbstract) return null; | |
| 65 if (!classMirror.isSubtypeOf(transformerClass) && | |
| 66 !classMirror.isSubtypeOf(groupClass) && | |
| 67 (aggregateClass == null || | |
| 68 !classMirror.isSubtypeOf(aggregateClass))) { | |
| 69 return null; | |
| 70 } | |
| 71 | |
| 72 var constructor = _getConstructor(classMirror, 'asPlugin'); | |
| 73 if (constructor == null) return null; | |
| 74 if (constructor.parameters.isEmpty) { | |
| 75 if (configuration.isNotEmpty) return null; | |
| 76 return classMirror.newInstance(const Symbol('asPlugin'), []).reflectee; | |
| 77 } | |
| 78 if (constructor.parameters.length != 1) return null; | |
| 79 | |
| 80 return classMirror.newInstance(const Symbol('asPlugin'), | |
| 81 [new BarbackSettings(configuration, mode)]).reflectee; | |
| 82 }).where((classMirror) => classMirror != null)); | |
| 83 } | |
| 84 | |
| 85 var library = _mirrors.libraries[Uri.parse(uri)]; | |
| 86 | |
| 87 // This should only happen if something's wrong with the logic in pub itself. | |
| 88 // If it were user error, the entire isolate would fail to load. | |
| 89 if (library == null) throw "Couldn't find library at $uri."; | |
| 90 | |
| 91 loadFromLibrary(library); | |
| 92 return transformers; | |
| 93 } | |
| 94 | |
| 95 // TODO(nweiz): clean this up when issue 13248 is fixed. | |
| 96 MethodMirror _getConstructor(ClassMirror classMirror, String constructor) { | |
| 97 var name = new Symbol("${MirrorSystem.getName(classMirror.simpleName)}" | |
| 98 ".$constructor"); | |
| 99 var candidate = classMirror.declarations[name]; | |
| 100 if (candidate is MethodMirror && candidate.isConstructor) return candidate; | |
| 101 return null; | |
| 102 } | |
| 103 | |
| 104 // Older barbacks don't support [AggregateTransformer], and calling | |
| 105 // [reflectClass] on an undefined class will throw an error, so we just define a | |
| 106 // null getter for them. | |
| 107 //# if barback >=0.14.1 | |
| 108 ClassMirror get _aggregateTransformerClass => | |
| 109 reflectClass(AggregateTransformer); | |
| 110 //# else | |
| 111 //> ClassMirror get _aggregateTransformerClass => null; | |
| 112 //# end | |
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Chromium Code Reviews
Issue 937243002:
Revert "Revert "Use native async/await support in pub."" (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart