Change the way Patterns work in scheduled_test/descriptor.

pkg/scheduled_test/lib/src/descriptor/entry.dart

-// Copyright (c) 2013, 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.
-
-library descriptor.entry;
-
-import 'dart:async';
-
-import '../utils.dart';
-import 'utils.dart';
-
-/// The base class for various declarative descriptions of filesystem entries.
-/// All asynchronous operations on descriptors are [schedule]d unless otherwise
-/// noted.
-abstract class Entry {
-  /// The name of this entry. For most operations, this must be a [String];
-  /// however, if the entry will only be used for validation, it may be a
-  /// non-[String] [Pattern]. In this case, there must be only one entry
-  /// matching it in the physical filesystem for validation to succeed.
-  final Pattern name;
-
-  Entry(this.name);
-
-  /// Schedules the creation of the described entry within the [parent]
-  /// directory. Returns a [Future] that completes after the creation is done.
-  ///
-  /// [parent] defaults to [defaultRoot].
-  Future create([String parent]);
-
-  /// Schedules the validation of the described entry. This validates that the
-  /// physical file system under [parent] contains an entry that matches the one
-  /// described by [this]. Returns a [Future] that completes to `null` if the
-  /// entry is valid, or throws an error if it failed.
-  ///
-  /// [parent] defaults to [defaultRoot].
-  Future validate([String parent]);
-
-  /// Treats [this] as an in-memory filesystem and returns a stream of the
-  /// contents of the child entry located at [path]. This only works if [this]
-  /// is a directory entry. This operation is not [schedule]d.
-  ///
-  /// This method uses POSIX paths regardless of the underlying operating
-  /// system.
-  ///
-  /// All errors in loading the file will be passed through the returned
-  /// [Stream].
-  Stream<List<int>> load(String pathToLoad) => errorStream("Can't load "
-      "'$pathToLoad' from within $nameDescription: not a directory.");
-
-  /// Returns the contents of [this] as a stream. This only works if [this] is a
-  /// file entry. This operation is not [schedule]d.
-  ///
-  /// All errors in loading the file will be passed through the returned
-  /// [Stream].
-  Stream<List<int>> read();
-
-  /// Asserts that the name of the descriptor is a [String] and returns it.
-  String get stringName {
-    if (name is String) return name;
-    throw 'Pattern $nameDescription must be a string.';
-  }
-
-  /// Returns a human-readable description of [name], for error reporting. For
-  /// string names, this will just be the name in quotes; for regular
-  /// expressions, it will use JavaScript-style `/.../` notation.
-  String get nameDescription => describePattern(name);
-
-  /// Returns a detailed tree-style description of [this].
-  String describe();
-}