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43 lines
1.6 KiB
TypeScript
43 lines
1.6 KiB
TypeScript
//
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// Copyright © 2024 Hardcore Engineering Inc.
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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 LexoRankBucket from 'lexorank/lib/lexoRank/lexoRankBucket'
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import type { Rank } from './types'
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import { LexoDecimal, LexoNumeralSystem36, LexoRank } from 'lexorank'
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/** @public */
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export function genRanks (count: number): Rank[] {
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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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const res: string[] = []
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for (let i = 0; i < count; i++) {
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cur = cur.add(gap)
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res.push(new LexoRank(LexoRankBucket.BUCKET_0, cur).toString())
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}
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return res
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}
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/** @public */
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export function makeRank (prev: Rank | undefined, next: Rank | undefined): Rank {
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const prevLexoRank = prev === undefined ? LexoRank.min() : LexoRank.parse(prev)
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const nextLexoRank = next === undefined ? LexoRank.max() : LexoRank.parse(next)
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return prevLexoRank.equals(nextLexoRank)
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? prevLexoRank.genNext().toString()
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: prevLexoRank.between(nextLexoRank).toString()
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}
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