Jennifer Messerly
fe294f3753
There's some changes in strong mode errors we may want to follow up on. Unforks the following: async, collection, convert, core, developer, internal, io, isolate, math, mirrors. Does not unfork: html, indexed_db, js, js_util, svg, typed_data, web_audio, web_gl, web_sql. R=vsm@google.com Review-Url: https://codereview.chromium.org/2698353003 .
70 lines
1.9 KiB
Dart
70 lines
1.9 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:_js_primitives' show printString;
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import 'dart:_js_helper' show patch;
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import 'dart:_interceptors' show JSArray;
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import 'dart:_foreign_helper' show JS;
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@patch
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class Symbol implements core.Symbol {
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@patch
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const Symbol(String name)
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: this._name = name;
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@patch
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int get hashCode {
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int hash = JS('int|Null', '#._hashCode', this);
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if (hash != null) return hash;
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const arbitraryPrime = 664597;
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hash = 0x1fffffff & (arbitraryPrime * _name.hashCode);
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JS('', '#._hashCode = #', this, hash);
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return hash;
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}
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@patch
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toString() => 'Symbol("$_name")';
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}
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/// Used internally by DDC to map ES6 symbols to Dart.
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class PrivateSymbol implements core.Symbol {
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// TODO(jmesserly): could also get this off the native symbol instead of
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// storing it. Mirrors already does this conversion.
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final String _name;
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final Object _nativeSymbol;
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const PrivateSymbol(this._name, this._nativeSymbol);
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static String getName(core.Symbol symbol) =>
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(symbol as PrivateSymbol)._name;
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static Object getNativeSymbol(core.Symbol symbol) {
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if (symbol is PrivateSymbol) return symbol._nativeSymbol;
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return null;
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}
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bool operator ==(other) => other is PrivateSymbol &&
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identical(_nativeSymbol, other._nativeSymbol);
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// TODO(jmesserly): is this equivalent to _nativeSymbol toString?
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toString() => 'Symbol("$_name")';
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}
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@patch
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void printToConsole(String line) {
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printString('$line');
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}
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@patch
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List/*<E>*/ makeListFixedLength/*<E>*/(List/*<E>*/ growableList) {
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JSArray.markFixedList(growableList);
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return growableList;
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}
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@patch
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List/*<E>*/ makeFixedListUnmodifiable/*<E>*/(List/*<E>*/ fixedLengthList) {
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JSArray.markUnmodifiableList(fixedLengthList);
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return fixedLengthList;
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}
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