| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:async'; |
| import 'dart:convert'; |
| import 'dart:typed_data'; |
| |
| import 'byte_stream.dart'; |
| |
| /// Converts a [Map] from parameter names to values to a URL query string. |
| /// |
| /// mapToQuery({"foo": "bar", "baz": "bang"}); |
| /// //=> "foo=bar&baz=bang" |
| String mapToQuery(Map<String, String> map, {Encoding encoding}) { |
| var pairs = <List<String>>[]; |
| map.forEach((key, value) => pairs.add([ |
| Uri.encodeQueryComponent(key, encoding: encoding), |
| Uri.encodeQueryComponent(value, encoding: encoding) |
| ])); |
| return pairs.map((pair) => "${pair[0]}=${pair[1]}").join("&"); |
| } |
| |
| /// Like [String.split], but only splits on the first occurrence of the pattern. |
| /// This will always return an array of two elements or fewer. |
| /// |
| /// split1("foo,bar,baz", ","); //=> ["foo", "bar,baz"] |
| /// split1("foo", ","); //=> ["foo"] |
| /// split1("", ","); //=> [] |
| List<String> split1(String toSplit, String pattern) { |
| if (toSplit.isEmpty) return <String>[]; |
| |
| var index = toSplit.indexOf(pattern); |
| if (index == -1) return [toSplit]; |
| return [ |
| toSplit.substring(0, index), |
| toSplit.substring(index + pattern.length) |
| ]; |
| } |
| |
| /// Returns the [Encoding] that corresponds to [charset]. Returns [fallback] if |
| /// [charset] is null or if no [Encoding] was found that corresponds to |
| /// [charset]. |
| Encoding encodingForCharset(String charset, [Encoding fallback = latin1]) { |
| if (charset == null) return fallback; |
| var encoding = Encoding.getByName(charset); |
| return encoding == null ? fallback : encoding; |
| } |
| |
| /// Returns the [Encoding] that corresponds to [charset]. Throws a |
| /// [FormatException] if no [Encoding] was found that corresponds to [charset]. |
| /// [charset] may not be null. |
| Encoding requiredEncodingForCharset(String charset) { |
| var encoding = Encoding.getByName(charset); |
| if (encoding != null) return encoding; |
| throw new FormatException('Unsupported encoding "$charset".'); |
| } |
| |
| /// A regular expression that matches strings that are composed entirely of |
| /// ASCII-compatible characters. |
| final RegExp _ASCII_ONLY = new RegExp(r"^[\x00-\x7F]+$"); |
| |
| /// Returns whether [string] is composed entirely of ASCII-compatible |
| /// characters. |
| bool isPlainAscii(String string) => _ASCII_ONLY.hasMatch(string); |
| |
| /// Converts [input] into a [Uint8List]. |
| /// |
| /// If [input] is a [TypedData], this just returns a view on [input]. |
| Uint8List toUint8List(List<int> input) { |
| if (input is Uint8List) return input; |
| if (input is TypedData) { |
| // TODO(nweiz): remove "as" when issue 11080 is fixed. |
| return new Uint8List.view((input as TypedData).buffer); |
| } |
| return new Uint8List.fromList(input); |
| } |
| |
| /// If [stream] is already a [ByteStream], returns it. Otherwise, wraps it in a |
| /// [ByteStream]. |
| ByteStream toByteStream(Stream<List<int>> stream) { |
| if (stream is ByteStream) return stream; |
| return new ByteStream(stream); |
| } |
| |
| /// Calls [onDone] once [stream] (a single-subscription [Stream]) is finished. |
| /// The return value, also a single-subscription [Stream] should be used in |
| /// place of [stream] after calling this method. |
| Stream<T> onDone<T>(Stream<T> stream, void onDone()) => |
| stream.transform(new StreamTransformer.fromHandlers(handleDone: (sink) { |
| sink.close(); |
| onDone(); |
| })); |
| |
| // TODO(nweiz): remove this when issue 7786 is fixed. |
| /// Pipes all data and errors from [stream] into [sink]. When [stream] is done, |
| /// [sink] is closed and the returned [Future] is completed. |
| Future store(Stream stream, EventSink sink) { |
| var completer = new Completer(); |
| stream.listen(sink.add, onError: sink.addError, onDone: () { |
| sink.close(); |
| completer.complete(); |
| }); |
| return completer.future; |
| } |
| |
| /// Pipes all data and errors from [stream] into [sink]. Completes [Future] once |
| /// [stream] is done. Unlike [store], [sink] remains open after [stream] is |
| /// done. |
| Future writeStreamToSink(Stream stream, EventSink sink) { |
| var completer = new Completer(); |
| stream.listen(sink.add, |
| onError: sink.addError, onDone: () => completer.complete()); |
| return completer.future; |
| } |
| |
| /// A pair of values. |
| class Pair<E, F> { |
| E first; |
| F last; |
| |
| Pair(this.first, this.last); |
| |
| String toString() => '($first, $last)'; |
| |
| bool operator ==(other) { |
| if (other is! Pair) return false; |
| return other.first == first && other.last == last; |
| } |
| |
| int get hashCode => first.hashCode ^ last.hashCode; |
| } |
| |
| /// Configures [future] so that its result (success or exception) is passed on |
| /// to [completer]. |
| void chainToCompleter(Future future, Completer completer) { |
| future.then(completer.complete, onError: completer.completeError); |
| } |