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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 utils; | 5 library utils; |
6 | 6 |
7 import 'dart:async'; | 7 import 'dart:async'; |
8 | 8 |
9 import 'package:stack_trace/stack_trace.dart'; | 9 import 'package:stack_trace/stack_trace.dart'; |
10 | 10 |
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22 return other.first == first && other.last == last; | 22 return other.first == first && other.last == last; |
23 } | 23 } |
24 | 24 |
25 int get hashCode => first.hashCode ^ last.hashCode; | 25 int get hashCode => first.hashCode ^ last.hashCode; |
26 } | 26 } |
27 | 27 |
28 /// Configures [future] so that its result (success or exception) is passed on | 28 /// Configures [future] so that its result (success or exception) is passed on |
29 /// to [completer]. | 29 /// to [completer]. |
30 void chainToCompleter(Future future, Completer completer) { | 30 void chainToCompleter(Future future, Completer completer) { |
31 future.then((value) => completer.complete(value), | 31 future.then((value) => completer.complete(value), |
32 onError: (e) => completer.completeError(e)); | 32 onError: completer.completeError); |
33 } | 33 } |
34 | 34 |
35 /// Prepends each line in [text] with [prefix]. If [firstPrefix] is passed, the | 35 /// Prepends each line in [text] with [prefix]. If [firstPrefix] is passed, the |
36 /// first line is prefixed with that instead. | 36 /// first line is prefixed with that instead. |
37 String prefixLines(String text, {String prefix: '| ', String firstPrefix}) { | 37 String prefixLines(String text, {String prefix: '| ', String firstPrefix}) { |
38 var lines = text.split('\n'); | 38 var lines = text.split('\n'); |
39 if (firstPrefix == null) { | 39 if (firstPrefix == null) { |
40 return lines.map((line) => '$prefix$line').join('\n'); | 40 return lines.map((line) => '$prefix$line').join('\n'); |
41 } | 41 } |
42 | 42 |
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78 Stream errorStream(error) => new Future.error(error).asStream(); | 78 Stream errorStream(error) => new Future.error(error).asStream(); |
79 | 79 |
80 /// Returns a buffered stream that will emit the same values as the stream | 80 /// Returns a buffered stream that will emit the same values as the stream |
81 /// returned by [future] once [future] completes. If [future] completes to an | 81 /// returned by [future] once [future] completes. If [future] completes to an |
82 /// error, the return value will emit that error and then close. | 82 /// error, the return value will emit that error and then close. |
83 Stream futureStream(Future<Stream> future) { | 83 Stream futureStream(Future<Stream> future) { |
84 var controller = new StreamController(sync: true); | 84 var controller = new StreamController(sync: true); |
85 future.then((stream) { | 85 future.then((stream) { |
86 stream.listen( | 86 stream.listen( |
87 controller.add, | 87 controller.add, |
88 onError: (error) => controller.addError(error), | 88 onError: controller.addError, |
89 onDone: controller.close); | 89 onDone: controller.close); |
90 }).catchError((e) { | 90 }).catchError((e) { |
91 controller.addError(e); | 91 controller.addError(e); |
92 controller.close(); | 92 controller.close(); |
93 }); | 93 }); |
94 return controller.stream; | 94 return controller.stream; |
95 } | 95 } |
96 | 96 |
97 /// Returns the first element of a [StreamIterator]. | 97 /// Returns the first element of a [StreamIterator]. |
98 /// | 98 /// |
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136 /// Returns a wrapped version of [stream] along with a function that will cancel | 136 /// Returns a wrapped version of [stream] along with a function that will cancel |
137 /// the wrapped stream. Unlike [StreamSubscription], this canceller will send a | 137 /// the wrapped stream. Unlike [StreamSubscription], this canceller will send a |
138 /// "done" message to the wrapped stream. | 138 /// "done" message to the wrapped stream. |
139 Pair<Stream, StreamCanceller> streamWithCanceller(Stream stream) { | 139 Pair<Stream, StreamCanceller> streamWithCanceller(Stream stream) { |
140 var controller = | 140 var controller = |
141 stream.isBroadcast ? new StreamController.broadcast(sync: true) | 141 stream.isBroadcast ? new StreamController.broadcast(sync: true) |
142 : new StreamController(sync: true); | 142 : new StreamController(sync: true); |
143 var controllerStream = controller.stream; | 143 var controllerStream = controller.stream; |
144 var subscription = stream.listen((value) { | 144 var subscription = stream.listen((value) { |
145 if (!controller.isClosed) controller.add(value); | 145 if (!controller.isClosed) controller.add(value); |
146 }, onError: (error) { | 146 }, onError: (error, [StackTrace stackTrace]) { |
147 if (!controller.isClosed) controller.addError(error); | 147 if (!controller.isClosed) controller.addError(error, stackTrace); |
148 }, onDone: controller.close); | 148 }, onDone: controller.close); |
149 return new Pair<Stream, StreamCanceller>(controllerStream, controller.close); | 149 return new Pair<Stream, StreamCanceller>(controllerStream, controller.close); |
150 } | 150 } |
151 | 151 |
152 // TODO(nweiz): remove this when issue 7787 is fixed. | 152 // TODO(nweiz): remove this when issue 7787 is fixed. |
153 /// Creates two single-subscription [Stream]s that each emit all values and | 153 /// Creates two single-subscription [Stream]s that each emit all values and |
154 /// errors from [stream]. This is useful if [stream] is single-subscription but | 154 /// errors from [stream]. This is useful if [stream] is single-subscription but |
155 /// multiple subscribers are necessary. | 155 /// multiple subscribers are necessary. |
156 Pair<Stream, Stream> tee(Stream stream) { | 156 Pair<Stream, Stream> tee(Stream stream) { |
157 var controller1 = new StreamController(sync: true); | 157 var controller1 = new StreamController(sync: true); |
158 var controller2 = new StreamController(sync: true); | 158 var controller2 = new StreamController(sync: true); |
159 stream.listen((value) { | 159 stream.listen((value) { |
160 controller1.add(value); | 160 controller1.add(value); |
161 controller2.add(value); | 161 controller2.add(value); |
162 }, onError: (error) { | 162 }, onError: (error, [StackTrace stackTrace]) { |
163 controller1.addError(error); | 163 controller1.addError(error, stackTrace); |
164 controller2.addError(error); | 164 controller2.addError(error, stackTrace); |
165 }, onDone: () { | 165 }, onDone: () { |
166 controller1.close(); | 166 controller1.close(); |
167 controller2.close(); | 167 controller2.close(); |
168 }); | 168 }); |
169 return new Pair<Stream, Stream>(controller1.stream, controller2.stream); | 169 return new Pair<Stream, Stream>(controller1.stream, controller2.stream); |
170 } | 170 } |
171 | 171 |
172 /// Takes a simple data structure (composed of [Map]s, [Iterable]s, scalar | 172 /// Takes a simple data structure (composed of [Map]s, [Iterable]s, scalar |
173 /// objects, and [Future]s) and recursively resolves all the [Future]s contained | 173 /// objects, and [Future]s) and recursively resolves all the [Future]s contained |
174 /// within. Completes with the fully resolved structure. | 174 /// within. Completes with the fully resolved structure. |
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202 } | 202 } |
203 | 203 |
204 /// Returns a string representation of [trace] that has the core and test frames | 204 /// Returns a string representation of [trace] that has the core and test frames |
205 /// folded together. | 205 /// folded together. |
206 String terseTraceString(StackTrace trace) { | 206 String terseTraceString(StackTrace trace) { |
207 return new Trace.from(trace).terse.foldFrames((frame) { | 207 return new Trace.from(trace).terse.foldFrames((frame) { |
208 return frame.package == 'scheduled_test' || frame.package == 'unittest' || | 208 return frame.package == 'scheduled_test' || frame.package == 'unittest' || |
209 frame.isCore; | 209 frame.isCore; |
210 }).toString().trim(); | 210 }).toString().trim(); |
211 } | 211 } |
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