Create a glob package.

pkg/glob/lib/src/utils.dart

+// Copyright (c) 2014, 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 glob.utils;
+
+/// A range from [min] to [max], inclusive.
+class Range {
+  /// The minimum value included by the range.
+  final int min;
+
+  /// The maximum value included by the range.
+  final int max;
+
+  /// Whether this range covers only a single number.
+  bool get isSingleton => min == max;
+
+  Range(this.min, this.max);
+
+  /// Returns a range that covers only [value].
+  Range.singleton(int value)
+      : this(value, value);
+
+  /// Whether [this] contains [value].
+  bool contains(int value) => value >= min && value <= max;
+}
+
+/// An implementation of [Match] constructed by [Glob]s.
+class GlobMatch implements Match {
+  final String input;
+  final Pattern pattern;
+  final int start = 0;
+
+  int get end => input.length;
+  int get groupCount => 0;
+
+  GlobMatch(this.input, this.pattern);
+
+  String operator [](int group) => this.group(group);
+
+  String group(int group) {
+    if (group != 0) throw new RangeError.range(group, 0, 0);
+    return input;
+  }
+
+  List<String> groups(List<int> groupIndices) =>
+      groupIndices.map((index) => group(index)).toList();
+}
+
+final _quote = new RegExp(r"[+*?{}|[\]\\().^$-]");
+
+/// Returns [contents] with characters that are meaningful in regular
+/// expressions backslash-escaped.
+String regExpQuote(String contents) =>
+    contents.replaceAllMapped(_quote, (char) => "\\${char[0]}");