27 lines
1.1 KiB
JavaScript
27 lines
1.1 KiB
JavaScript
import { tuple } from './tuple.js';
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import { integer } from './integer.js';
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import { paddedUintToBase32StringMapper, uintToBase32StringUnmapper } from './_internals/mappers/UintToBase32String.js';
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const padded10Mapper = paddedUintToBase32StringMapper(10);
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const padded8Mapper = paddedUintToBase32StringMapper(8);
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function ulidMapper(parts) {
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return (padded10Mapper(parts[0]) +
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padded8Mapper(parts[1]) +
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padded8Mapper(parts[2]));
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}
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function ulidUnmapper(value) {
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if (typeof value !== 'string' || value.length !== 26) {
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throw new Error('Unsupported type');
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}
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return [
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uintToBase32StringUnmapper(value.slice(0, 10)),
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uintToBase32StringUnmapper(value.slice(10, 18)),
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uintToBase32StringUnmapper(value.slice(18)),
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];
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}
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export function ulid() {
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const timestampPartArbitrary = integer({ min: 0, max: 0xffffffffffff });
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const randomnessPartOneArbitrary = integer({ min: 0, max: 0xffffffffff });
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const randomnessPartTwoArbitrary = integer({ min: 0, max: 0xffffffffff });
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return tuple(timestampPartArbitrary, randomnessPartOneArbitrary, randomnessPartTwoArbitrary).map(ulidMapper, ulidUnmapper);
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}
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