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