37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
// Pleroma uses base62 IDs, Mastodon uses 0-9 big ints encoded as strings.
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// Using base62 for both works, since the first 10 characters of base62
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// are 0-9.
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import { padStart } from './lodash-lite'
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// Pleroma uses the 0-9A-Za-z alphabet for base62, which is the same as ASCII, which
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// is the same as JavaScript sort order and IndexedDB order.
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const MIN_CHAR_CODE = 48 // '0'.charCodeAt(0)
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const MAX_CHAR_CODE = 122 // 'z'.charCodeAt(0)
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const MAX_ID_LENGTH = 30 // assume that Mastodon/Pleroma IDs won't get any bigger than this
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export function zeroPad (str, toSize) {
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return padStart(str, toSize, '0')
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}
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export function toPaddedBigInt (id) {
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return zeroPad(id, MAX_ID_LENGTH)
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}
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export function toReversePaddedBigInt (id) {
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let padded = toPaddedBigInt(id)
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let reversed = ''
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for (let i = 0; i < padded.length; i++) {
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let charCode = padded.charCodeAt(i)
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let inverseCharCode = MIN_CHAR_CODE + MAX_CHAR_CODE - charCode
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reversed += String.fromCharCode(inverseCharCode)
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}
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return reversed
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}
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export function compareTimelineItemSummaries (left, right) {
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let leftPadded = toPaddedBigInt(left.id)
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let rightPadded = toPaddedBigInt(right.id)
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return leftPadded < rightPadded ? -1 : leftPadded === rightPadded ? 0 : 1
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}
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