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1 // Copyright (c) 2011, 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 // Generic utility functions. | |
6 | |
7 /** Invokes [callback] and returns how long it took to execute in ms. */ | |
8 num time(callback()) { | |
9 final watch = new Stopwatch(); | |
10 watch.start(); | |
11 callback(); | |
12 watch.stop(); | |
13 return watch.elapsedInMs(); | |
14 } | |
15 | |
16 /** Turns [name] into something that's safe to use as a file name. */ | |
17 String sanitize(String name) => name.replaceAll(':', '_').replaceAll('/', '_'); | |
18 | |
19 /** Returns the number of times [search] occurs in [text]. */ | |
20 int countOccurrences(String text, String search) { | |
21 int start = 0; | |
22 int count = 0; | |
23 | |
24 while (true) { | |
25 start = text.indexOf(search, start); | |
26 if (start == -1) break; | |
27 count++; | |
28 // Offsetting by search length means overlapping results are not counted. | |
29 start += search.length; | |
30 } | |
31 | |
32 return count; | |
33 } | |
34 | |
35 /** Repeats [text] [count] times, separated by [separator] if given. */ | |
36 String repeat(String text, int count, [String separator]) { | |
37 // TODO(rnystrom): Should be in corelib. | |
38 final buffer = new StringBuffer(); | |
39 for (int i = 0; i < count; i++) { | |
40 buffer.add(text); | |
41 if ((i < count - 1) && (separator !== null)) buffer.add(separator); | |
42 } | |
43 | |
44 return buffer.toString(); | |
45 } | |
46 | |
47 /** Removes up to [indentation] leading whitespace characters from [text]. */ | |
48 String unindent(String text, int indentation) { | |
49 var start; | |
50 for (start = 0; start < Math.min(indentation, text.length); start++) { | |
51 // Stop if we hit a non-whitespace character. | |
52 if (text[start] != ' ') break; | |
53 } | |
54 | |
55 return text.substring(start); | |
56 } | |
57 | |
58 /** Sorts the map by the key, doing a case-insensitive comparison. */ | |
59 List orderByName(Map<String, Dynamic> map) { | |
60 // TODO(rnystrom): it'd be nice to have this in corelib. | |
61 List keys = map.getKeys(); | |
62 keys.sort((x, y) => x.toUpperCase().compareTo(y.toUpperCase())); | |
63 final values = []; | |
64 for (var k in keys) { | |
65 values.add(map[k]); | |
66 } | |
67 return values; | |
68 } | |
69 | |
70 /** | |
71 * Joins [items] into a single, comma-separated string using [conjunction]. | |
72 * E.g. `['A', 'B', 'C']` becomes `"A, B, and C"`. | |
73 */ | |
74 String joinWithCommas(List<String> items, [String conjunction = 'and']) { | |
75 if (items.length == 1) return items[0]; | |
76 if (items.length == 2) return "${items[0]} $conjunction ${items[1]}"; | |
77 return Strings.join(items.getRange(0, items.length - 1), ', ') + | |
78 ', $conjunction ' + items[items.length - 1]; | |
79 } | |
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