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45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
//
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// Copyright © 2020, 2021 Anticrm Platform Contributors.
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//
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// Licensed under the Eclipse Public License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License. You may
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// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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//
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import { LexoRank, LexoDecimal, LexoNumeralSystem36 } from 'lexorank'
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import LexoRankBucket from 'lexorank/lib/lexoRank/lexoRankBucket'
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/**
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* @public
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*/
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export const genRanks = (count: number): Generator<string, void, unknown> =>
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(function * () {
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const sys = new LexoNumeralSystem36()
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const base = 36
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const max = base ** 6
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const gap = LexoDecimal.parse(Math.trunc(max / (count + 2)).toString(base), sys)
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let cur = LexoDecimal.parse('0', sys)
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for (let i = 0; i < count; i++) {
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cur = cur.add(gap)
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yield new LexoRank(LexoRankBucket.BUCKET_0, cur).toString()
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}
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})()
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/**
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* @public
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*/
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export const calcRank = (prev?: { rank: string }, next?: { rank: string }): string => {
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const a = prev?.rank !== undefined ? LexoRank.parse(prev.rank) : LexoRank.min()
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const b = next?.rank !== undefined ? LexoRank.parse(next.rank) : LexoRank.max()
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return a.between(b).toString()
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}
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