23 lines
603 B
TypeScript
23 lines
603 B
TypeScript
/// SPDX-License-Identifier: GPL-3.0-or-later
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/// SPDX-FileCopyrightText: Copyright © 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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// Utilities for Maps of Sets
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import { FlexSet, FlexMap, Canonicalizer } from '@preserves/core';
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export function add<K,V>(m: FlexMap<K, FlexSet<V>>, k: K, v: V, c: Canonicalizer<V>) {
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let s = m.get(k);
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if (!s) {
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s = new FlexSet(c);
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m.set(k, s);
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}
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s.add(v);
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}
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export function del<K,V>(m: FlexMap<K, FlexSet<V>>, k: K, v: V) {
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const s = m.get(k);
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if (!s) return;
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s.delete(v);
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if (s.size === 0) m.delete(k);
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}
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