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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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