| // 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. |
| |
| import 'dart:_js_primitives' show printString; |
| import 'dart:_js_helper' show patch; |
| import 'dart:_interceptors' show JSArray; |
| import 'dart:_foreign_helper' show JS; |
| |
| @patch |
| class Symbol implements core.Symbol { |
| @patch |
| const Symbol(String name) : this._name = name; |
| |
| @patch |
| int get hashCode { |
| int hash = JS('int|Null', '#._hashCode', this); |
| if (hash != null) return hash; |
| const arbitraryPrime = 664597; |
| hash = 0x1fffffff & (arbitraryPrime * _name.hashCode); |
| JS('', '#._hashCode = #', this, hash); |
| return hash; |
| } |
| |
| @patch |
| toString() => 'Symbol("$_name")'; |
| } |
| |
| /// Used internally by DDC to map ES6 symbols to Dart. |
| class PrivateSymbol implements core.Symbol { |
| // TODO(jmesserly): could also get this off the native symbol instead of |
| // storing it. Mirrors already does this conversion. |
| final String _name; |
| final Object _nativeSymbol; |
| |
| const PrivateSymbol(this._name, this._nativeSymbol); |
| |
| static String getName(core.Symbol symbol) => (symbol as PrivateSymbol)._name; |
| |
| static Object getNativeSymbol(core.Symbol symbol) { |
| if (symbol is PrivateSymbol) return symbol._nativeSymbol; |
| return null; |
| } |
| |
| bool operator ==(other) => |
| other is PrivateSymbol && identical(_nativeSymbol, other._nativeSymbol); |
| |
| // TODO(jmesserly): is this equivalent to _nativeSymbol toString? |
| toString() => 'Symbol("$_name")'; |
| } |
| |
| @patch |
| void printToConsole(String line) { |
| printString('$line'); |
| } |
| |
| @patch |
| List/*<E>*/ makeListFixedLength/*<E>*/(List/*<E>*/ growableList) { |
| JSArray.markFixedList(growableList); |
| return growableList; |
| } |
| |
| @patch |
| List/*<E>*/ makeFixedListUnmodifiable/*<E>*/(List/*<E>*/ fixedLengthList) { |
| JSArray.markUnmodifiableList(fixedLengthList); |
| return fixedLengthList; |
| } |