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| 1 // Copyright (c) 2017, 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 import 'chain.dart'; |
| 6 import 'frame.dart'; |
| 7 import 'lazy_trace.dart'; |
| 8 import 'trace.dart'; |
| 9 |
| 10 /// A thunk for lazily constructing a [Chain]. |
| 11 typedef Chain ChainThunk(); |
| 12 |
| 13 /// A wrapper around a [ChainThunk]. This works around issue 9579 by avoiding |
| 14 /// the conversion of native [StackTrace]s to strings until it's absolutely |
| 15 /// necessary. |
| 16 class LazyChain implements Chain { |
| 17 final ChainThunk _thunk; |
| 18 Chain _inner; |
| 19 |
| 20 LazyChain(this._thunk); |
| 21 |
| 22 Chain get _chain { |
| 23 if (_inner == null) _inner = _thunk(); |
| 24 return _inner; |
| 25 } |
| 26 |
| 27 List<Trace> get traces => _chain.traces; |
| 28 Chain get terse => _chain.terse; |
| 29 Chain foldFrames(bool predicate(Frame frame), {bool terse: false}) => |
| 30 new LazyChain(() => _chain.foldFrames(predicate, terse: terse)); |
| 31 Trace toTrace() => new LazyTrace(() => _chain.toTrace()); |
| 32 String toString() => _chain.toString(); |
| 33 } |
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