OLD | NEW |
1 // Copyright (c) 2013, 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 /// Utilities that shouldn't be in this package. | 5 library source_span.utils; |
6 library source_maps.utils; | 6 |
| 7 /// Returns the minimum of [obj1] and [obj2] according to |
| 8 /// [Comparable.compareTo]. |
| 9 Comparable min(Comparable obj1, Comparable obj2) => |
| 10 obj1.compareTo(obj2) > 0 ? obj2 : obj1; |
| 11 |
| 12 /// Returns the maximum of [obj1] and [obj2] according to |
| 13 /// [Comparable.compareTo]. |
| 14 Comparable max(Comparable obj1, Comparable obj2) => |
| 15 obj1.compareTo(obj2) > 0 ? obj1 : obj2; |
7 | 16 |
8 /// Find the first entry in a sorted [list] that matches a monotonic predicate. | 17 /// Find the first entry in a sorted [list] that matches a monotonic predicate. |
| 18 /// |
9 /// Given a result `n`, that all items before `n` will not match, `n` matches, | 19 /// Given a result `n`, that all items before `n` will not match, `n` matches, |
10 /// and all items after `n` match too. The result is -1 when there are no | 20 /// and all items after `n` match too. The result is -1 when there are no |
11 /// items, 0 when all items match, and list.length when none does. | 21 /// items, 0 when all items match, and list.length when none does. |
12 // TODO(sigmund): remove this function after dartbug.com/5624 is fixed. | |
13 int binarySearch(List list, bool matches(item)) { | 22 int binarySearch(List list, bool matches(item)) { |
14 if (list.length == 0) return -1; | 23 if (list.length == 0) return -1; |
15 if (matches(list.first)) return 0; | 24 if (matches(list.first)) return 0; |
16 if (!matches(list.last)) return list.length; | 25 if (!matches(list.last)) return list.length; |
17 | 26 |
18 int min = 0; | 27 int min = 0; |
19 int max = list.length - 1; | 28 int max = list.length - 1; |
20 while (min < max) { | 29 while (min < max) { |
21 var half = min + ((max - min) ~/ 2); | 30 var half = min + ((max - min) ~/ 2); |
22 if (matches(list[half])) { | 31 if (matches(list[half])) { |
23 max = half; | 32 max = half; |
24 } else { | 33 } else { |
25 min = half + 1; | 34 min = half + 1; |
26 } | 35 } |
27 } | 36 } |
28 return max; | 37 return max; |
29 } | 38 } |
| 39 |
OLD | NEW |