| // 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. |
| |
| patch class Symbol { |
| final String _name; |
| /* patch */ const Symbol(String name) |
| : this._name = _validate(name); |
| |
| |
| static final RegExp _validationPattern = |
| new RegExp(r'^[a-zA-Z$][a-zA-Z$0-9_]*=?'); |
| |
| static _validate(String name) { |
| if (name is! String) throw new ArgumentError('name must be a String'); |
| if (name.isEmpty) return; |
| if (name.startsWith('_')) { |
| throw new ArgumentError('"$name" is a private identifier'); |
| } |
| if (!_validationPattern.hasMatch(name)) { |
| throw new ArgumentError( |
| '"$name" is not an identifier or an empty String'); |
| } |
| return name; |
| } |
| |
| /* patch */ bool operator ==(other) { |
| return other is Symbol && _name == other._name; |
| } |
| |
| /* patch */ int get hashCode { |
| const arbitraryPrime = 664597; |
| return 0x1fffffff & (arbitraryPrime * _name.hashCode); |
| } |
| } |