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26 lines
759 B
26 lines
759 B
import { getRandomBytesAsync } from 'expo-random'
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import { urlAlphabet } from '../url-alphabet/index.js'
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let random = getRandomBytesAsync
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let customAlphabet = (alphabet, size) => {
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let mask = (2 << (31 - Math.clz32((alphabet.length - 1) | 1))) - 1
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let step = Math.ceil((1.6 * mask * size) / alphabet.length)
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let tick = id =>
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random(step).then(bytes => {
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let i = step
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while (i--) {
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id += alphabet[bytes[i] & mask] || ''
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if (id.length === size) return id
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}
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return tick(id)
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})
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return () => tick('')
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}
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let nanoid = (size = 21) =>
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random(size).then(bytes => {
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let id = ''
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while (size--) {
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id += urlAlphabet[bytes[size] & 63]
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}
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return id
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})
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export { nanoid, customAlphabet, random }
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