Andrew Zambazos
143 lines
3.4 KiB
JavaScript
143 lines
3.4 KiB
JavaScript
/*
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* Copyright (C) 2018-2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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class Multimap
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{
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constructor(items = [])
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{
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this._map = new Map;
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for (let [key, value] of items)
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this.add(key, value);
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}
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// Public
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get size()
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{
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return this._map.size;
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}
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has(key, value)
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{
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let valueSet = this._map.get(key);
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if (!valueSet)
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return false;
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return value === undefined || valueSet.has(value);
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}
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get(key)
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{
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return this._map.get(key);
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}
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add(key, value)
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{
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let valueSet = this._map.get(key);
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if (!valueSet) {
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valueSet = new Set;
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this._map.set(key, valueSet);
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}
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valueSet.add(value);
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return this;
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}
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delete(key, value)
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{
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// Allow an entire key to be removed by not passing a value.
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if (arguments.length === 1)
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return this._map.delete(key);
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let valueSet = this._map.get(key);
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if (!valueSet)
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return false;
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let deleted = valueSet.delete(value);
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if (!valueSet.size)
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this._map.delete(key);
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return deleted;
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}
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take(key, value)
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{
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// Allow an entire key to be removed by not passing a value.
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if (arguments.length === 1)
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return this._map.take(key);
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let valueSet = this._map.get(key);
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if (!valueSet)
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return undefined;
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let result = valueSet.take(value);
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if (!valueSet.size)
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this._map.delete(key);
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return result;
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}
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clear()
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{
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this._map.clear();
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}
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keys()
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{
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return this._map.keys();
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}
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*values()
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{
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for (let valueSet of this._map.values()) {
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for (let value of valueSet)
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yield value;
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}
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}
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sets()
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{
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return this._map.entries();
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}
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*[Symbol.iterator]()
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{
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for (let [key, valueSet] of this._map) {
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for (let value of valueSet)
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yield [key, value];
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}
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}
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copy()
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{
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return new Multimap(this.toJSON());
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}
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toJSON()
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{
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return Array.from(this);
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}
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}
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