mirror of
https://github.com/dart-lang/sdk
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127 lines
4.5 KiB
Dart
127 lines
4.5 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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part of dart.io;
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class _Platform {
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external static int _numberOfProcessors();
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external static String _pathSeparator();
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external static String _operatingSystem();
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external static _localHostname();
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external static _executable();
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external static _resolvedExecutable();
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/**
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* Retrieve the entries of the process environment.
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*
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* The result is an [Iterable] of strings, where each string represents
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* an environment entry.
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*
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* Environment entries should be strings containing
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* a non-empty name and a value separated by a '=' character.
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* The name does not contain a '=' character,
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* so the name is everything up to the first '=' character.
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* Values are everything after the first '=' charcacter.
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* A value may contain further '=' characters, and it may be empty.
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*
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* Returns an [OSError] if retrieving the environment fails.
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*/
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external static _environment();
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external static List<String> _executableArguments();
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external static String _packageRoot();
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external static String _packageConfig();
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external static String _version();
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static String executable = _executable();
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static String resolvedExecutable = _resolvedExecutable();
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static String packageRoot = _packageRoot();
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static String packageConfig = _packageConfig();
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// Cache the OS environemnt. This can be an OSError instance if
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// retrieving the environment failed.
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static var/*OSError|Map<String,String>*/ _environmentCache;
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static int get numberOfProcessors => _numberOfProcessors();
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static String get pathSeparator => _pathSeparator();
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static String get operatingSystem => _operatingSystem();
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static Uri script;
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static String get localHostname {
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var result = _localHostname();
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if (result is OSError) {
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throw result;
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} else {
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return result;
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}
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}
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static List<String> get executableArguments => _executableArguments();
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static Map<String, String> get environment {
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if (_environmentCache == null) {
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var env = _environment();
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if (env is !OSError) {
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var isWindows = operatingSystem == 'windows';
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var result = isWindows
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? new _CaseInsensitiveStringMap<String>()
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: new Map<String, String>();
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for (var str in env) {
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if (str == null) {
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continue;
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}
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// The Strings returned by [_environment()] are expected to be
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// valid environment entries, but exceptions have been seen
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// (e.g., an entry of just '=' has been seen on OS/X).
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// Invalid entries (lines without a '=' or with an empty name)
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// are discarded.
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var equalsIndex = str.indexOf('=');
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if (equalsIndex > 0) {
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result[str.substring(0, equalsIndex)] =
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str.substring(equalsIndex + 1);
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}
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}
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_environmentCache = new UnmodifiableMapView<String, String>(result);
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} else {
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_environmentCache = env;
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}
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}
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if (_environmentCache is OSError) {
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throw _environmentCache;
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} else {
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return _environmentCache as Object/*=Map<String, String>*/;
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}
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}
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static String get version => _version();
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}
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// Environment variables are case-insensitive on Windows. In order
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// to reflect that we use a case-insensitive string map on Windows.
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class _CaseInsensitiveStringMap<V> implements Map<String, V> {
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final Map<String, V> _map = new Map<String, V>();
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bool containsKey(Object key) =>
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key is String && _map.containsKey(key.toUpperCase());
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bool containsValue(Object value) => _map.containsValue(value);
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V operator [](Object key) => key is String ? _map[key.toUpperCase()] : null;
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void operator []=(String key, V value) {
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_map[key.toUpperCase()] = value;
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}
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V putIfAbsent(String key, V ifAbsent()) {
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return _map.putIfAbsent(key.toUpperCase(), ifAbsent);
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}
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void addAll(Map<String, V> other) {
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other.forEach((key, value) => this[key.toUpperCase()] = value);
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}
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V remove(Object key) => key is String ? _map.remove(key.toUpperCase()) : null;
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void clear() { _map.clear(); }
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void forEach(void f(String key, V value)) { _map.forEach(f); }
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Iterable<String> get keys => _map.keys;
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Iterable<V> get values => _map.values;
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int get length => _map.length;
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bool get isEmpty => _map.isEmpty;
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bool get isNotEmpty => _map.isNotEmpty;
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String toString() => _map.toString();
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}
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