38 lines
1.4 KiB
TypeScript
38 lines
1.4 KiB
TypeScript
//---------------------------------------------------------------------------
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// @syndicate-lang/core, an implementation of Syndicate dataspaces for JS.
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// Copyright (C) 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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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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