rnystrom@google.com
0bc9b19740
Review URL: https://chromiumcodereview.appspot.com//10850034 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10354 260f80e4-7a28-3924-810f-c04153c831b5
122 lines
2.8 KiB
Dart
122 lines
2.8 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/**
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* Generic utility functions. Stuff that should possibly be in core.
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*/
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#library('utils');
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#import('dart:crypto');
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#import('dart:isolate');
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/** A pair of values. */
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class Pair<E, F> {
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E first;
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F last;
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Pair(this.first, this.last);
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String toString() => '($first, $last)';
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bool operator==(other) {
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if (other is! Pair) return false;
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return other.first == first && other.last == last;
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}
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}
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// TODO(rnystrom): Move into String?
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/** Pads [source] to [length] by adding spaces at the end. */
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String padRight(String source, int length) {
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final result = new StringBuffer();
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result.add(source);
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while (result.length < length) {
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result.add(' ');
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}
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return result.toString();
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}
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/**
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* Runs [fn] after [future] completes, whether it completes successfully or not.
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* Essentially an asynchronous `finally` block.
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*/
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always(Future future, fn()) {
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var completer = new Completer();
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future.then((_) => fn());
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future.handleException((_) {
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fn();
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return false;
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});
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}
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/**
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* Flattens nested lists into a single list containing only non-list elements.
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*/
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List flatten(List nested) {
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var result = [];
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helper(list) {
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for (var element in list) {
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if (element is List) {
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helper(element);
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} else {
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result.add(element);
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}
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}
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}
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helper(nested);
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return result;
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}
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/**
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* Asserts that [iter] contains only one element, and returns it.
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*/
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only(Iterable iter) {
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var iterator = iter.iterator();
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assert(iterator.hasNext());
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var obj = iterator.next();
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assert(!iterator.hasNext());
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return obj;
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}
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/**
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* Replace each instance of [matcher] in [source] with the return value of [fn].
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*/
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String replace(String source, Pattern matcher, String fn(Match)) {
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var buffer = new StringBuffer();
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var start = 0;
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for (var match in matcher.allMatches(source)) {
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buffer.add(source.substring(start, match.start()));
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start = match.end();
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buffer.add(fn(match));
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}
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buffer.add(source.substring(start));
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return buffer.toString();
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}
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/**
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* Returns whether or not [str] ends with [matcher].
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*/
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bool endsWithPattern(String str, Pattern matcher) {
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for (var match in matcher.allMatches(str)) {
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if (match.end() == str.length) return true;
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}
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return false;
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}
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/**
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* Returns the hex-encoded sha1 hash of [source].
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*/
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String sha1(String source) =>
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CryptoUtils.bytesToHex(new SHA1().update(source.charCodes()).digest());
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/**
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* Returns a [Future] that completes in [milliSeconds].
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*/
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Future sleep(int milliSeconds) {
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var completer = new Completer();
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new Timer(milliSeconds, completer.complete);
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return completer.future;
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}
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