| // 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. |
| |
| part of dart._collection.dev; |
| |
| /** |
| * Implementation of [core.Symbol]. This class uses the same name as |
| * a core class so a user can't tell the difference. |
| * |
| * The purpose of this class is to hide [_name] from user code, but |
| * make it accessible to Dart platform code via the static method |
| * [getName]. |
| */ |
| class Symbol implements core.Symbol { |
| final String _name; |
| |
| static final RegExp validationPattern = |
| new RegExp(r'^(?:[a-zA-Z$][a-zA-Z$0-9_]*\.)*(?:[a-zA-Z$][a-zA-Z$0-9_]*=?|' |
| r'-|' |
| r'unary-|' |
| r'\[\]=|' |
| r'~|' |
| r'==|' |
| r'\[\]|' |
| r'\*|' |
| r'/|' |
| r'%|' |
| r'~/|' |
| r'\+|' |
| r'<<|' |
| r'>>|' |
| r'>=|' |
| r'>|' |
| r'<=|' |
| r'<|' |
| r'&|' |
| r'\^|' |
| r'\|' |
| r')$'); |
| |
| external const Symbol(String name); |
| |
| /** |
| * Platform-private method used by the mirror system to create |
| * otherwise invalid names. |
| */ |
| const Symbol.unvalidated(this._name); |
| |
| // This is called by dart2js. |
| Symbol.validated(String name) |
| : this._name = validate(name); |
| |
| bool operator ==(other) => other is Symbol && _name == other._name; |
| |
| int get hashCode { |
| const arbitraryPrime = 664597; |
| return 0x1fffffff & (arbitraryPrime * _name.hashCode); |
| } |
| |
| toString() => 'Symbol("$_name")'; |
| |
| /// Platform-private accessor which cannot be called from user libraries. |
| static String getName(Symbol symbol) => symbol._name; |
| |
| static String validate(String name) { |
| if (name.isEmpty) return name; |
| 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; |
| } |
| } |