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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 lazy_trace; | 5 library lazy_trace; |
6 | 6 |
7 import 'frame.dart'; | 7 import 'frame.dart'; |
8 import 'trace.dart'; | 8 import 'trace.dart'; |
9 | 9 |
10 /// A thunk for lazily constructing a [Trace]. | 10 /// A thunk for lazily constructing a [Trace]. |
11 typedef Trace TraceThunk(); | 11 typedef Trace TraceThunk(); |
12 | 12 |
13 /// A wrapper around a [TraceThunk]. This works around issue 9579 by avoiding | 13 /// A wrapper around a [TraceThunk]. This works around issue 9579 by avoiding |
14 /// the conversion of native [StackTrace]s to strings until it's absolutely | 14 /// the conversion of native [StackTrace]s to strings until it's absolutely |
15 /// necessary. | 15 /// necessary. |
16 class LazyTrace implements Trace { | 16 class LazyTrace implements Trace { |
17 final TraceThunk _thunk; | 17 final TraceThunk _thunk; |
18 Trace _inner; | 18 Trace _inner; |
19 | 19 |
20 LazyTrace(this._thunk); | 20 LazyTrace(this._thunk); |
21 | 21 |
22 Trace get _trace { | 22 Trace get _trace { |
23 if (_inner == null) _inner = _thunk(); | 23 if (_inner == null) _inner = _thunk(); |
24 return _inner; | 24 return _inner; |
25 } | 25 } |
26 | 26 |
27 List<Frame> get frames => _trace.frames; | 27 List<Frame> get frames => _trace.frames; |
28 StackTrace get vmTrace => _trace.vmTrace; | 28 StackTrace get vmTrace => _trace.vmTrace; |
29 Trace get terse => new LazyTrace(() => _trace.terse); | 29 Trace get terse => new LazyTrace(() => _trace.terse); |
30 Trace foldFrames(bool predicate(frame)) => | 30 Trace foldFrames(bool predicate(frame), {bool terse: false}) => |
31 new LazyTrace(() => _trace.foldFrames(predicate)); | 31 new LazyTrace(() => _trace.foldFrames(predicate, terse: terse)); |
32 String toString() => _trace.toString(); | 32 String toString() => _trace.toString(); |
33 | 33 |
34 // Work around issue 14075. | 34 // Work around issue 14075. |
35 set frames(_) => throw new UnimplementedError(); | 35 set frames(_) => throw new UnimplementedError(); |
36 } | 36 } |
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