unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/lib/io/platform_impl.dart

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