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| 1 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file | 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 | 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 dart_style.benchmark.benchmark; | 5 library dart_style.benchmark.benchmark; | 
| 6 | 6 | 
| 7 import 'dart:io'; | 7 import 'dart:io'; | 
| 8 | 8 | 
| 9 import 'package:path/path.dart' as p; | 9 import 'package:path/path.dart' as p; | 
| 10 | 10 | 
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| 26   // us see how much variance there is. | 26   // us see how much variance there is. | 
| 27   for (var i = 0; i <= NUM_TRIALS; i++) { | 27   for (var i = 0; i <= NUM_TRIALS; i++) { | 
| 28     var start = new DateTime.now(); | 28     var start = new DateTime.now(); | 
| 29 | 29 | 
| 30     // For a single benchmark, format the source multiple times. | 30     // For a single benchmark, format the source multiple times. | 
| 31     var result; | 31     var result; | 
| 32     for (var j = 0; j < FORMATS_PER_TRIAL; j++) { | 32     for (var j = 0; j < FORMATS_PER_TRIAL; j++) { | 
| 33       result = formatSource(); | 33       result = formatSource(); | 
| 34     } | 34     } | 
| 35 | 35 | 
| 36     var elapsed = new DateTime.now() | 36     var elapsed = | 
| 37         .difference(start).inMilliseconds / FORMATS_PER_TRIAL; | 37         new DateTime.now().difference(start).inMilliseconds / FORMATS_PER_TRIAL; | 
| 38 | 38 | 
| 39     // Keep track of the best run so far. | 39     // Keep track of the best run so far. | 
| 40     if (elapsed >= best) continue; | 40     if (elapsed >= best) continue; | 
| 41     best = elapsed; | 41     best = elapsed; | 
| 42 | 42 | 
| 43     // Sanity check to make sure the output is what we expect and to make sure | 43     // Sanity check to make sure the output is what we expect and to make sure | 
| 44     // the VM doesn't optimize "dead" code away. | 44     // the VM doesn't optimize "dead" code away. | 
| 45     if (result != expected) { | 45     if (result != expected) { | 
| 46       print("Incorrect output:\n$result"); | 46       print("Incorrect output:\n$result"); | 
| 47       exit(1); | 47       exit(1); | 
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| 72     result = " " * (length - result.length) + result; | 72     result = " " * (length - result.length) + result; | 
| 73   } | 73   } | 
| 74 | 74 | 
| 75   return result; | 75   return result; | 
| 76 } | 76 } | 
| 77 | 77 | 
| 78 String formatSource() { | 78 String formatSource() { | 
| 79   var formatter = new DartFormatter(); | 79   var formatter = new DartFormatter(); | 
| 80   return formatter.format(source); | 80   return formatter.format(source); | 
| 81 } | 81 } | 
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