Samuel Newman
107 lines
2.7 KiB
TypeScript
107 lines
2.7 KiB
TypeScript
import {useCallback, useMemo} from 'react'
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import Graphemer from 'graphemer'
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export function enforceLen(
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str: string,
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len: number,
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ellipsis = false,
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mode: 'end' | 'middle' = 'end',
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): string {
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str = str || ''
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if (str.length > len) {
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if (ellipsis) {
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if (mode === 'end') {
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return str.slice(0, len) + '…'
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} else if (mode === 'middle') {
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const half = Math.floor(len / 2)
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return str.slice(0, half) + '…' + str.slice(-half)
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} else {
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// fallback
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return str.slice(0, len)
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}
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} else {
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return str.slice(0, len)
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}
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}
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return str
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}
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export function useEnforceMaxGraphemeCount() {
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const splitter = useMemo(() => new Graphemer(), [])
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return useCallback(
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(text: string, maxCount: number) => {
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if (splitter.countGraphemes(text) > maxCount) {
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return splitter.splitGraphemes(text).slice(0, maxCount).join('')
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} else {
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return text
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}
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},
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[splitter],
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)
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}
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export function useWarnMaxGraphemeCount({
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text,
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maxCount,
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}: {
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text: string
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maxCount: number
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}) {
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const splitter = useMemo(() => new Graphemer(), [])
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return useMemo(() => {
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return splitter.countGraphemes(text) > maxCount
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}, [splitter, maxCount, text])
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}
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// https://stackoverflow.com/a/52171480
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export function toHashCode(str: string, seed = 0): number {
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let h1 = 0xdeadbeef ^ seed,
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h2 = 0x41c6ce57 ^ seed
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for (let i = 0, ch; i < str.length; i++) {
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ch = str.charCodeAt(i)
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h1 = Math.imul(h1 ^ ch, 2654435761)
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h2 = Math.imul(h2 ^ ch, 1597334677)
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}
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h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507)
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h1 ^= Math.imul(h2 ^ (h2 >>> 13), 3266489909)
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h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507)
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h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909)
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return 4294967296 * (2097151 & h2) + (h1 >>> 0)
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}
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export function countLines(str: string | undefined): number {
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if (!str) return 0
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return str.match(/\n/g)?.length ?? 0
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}
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// Augments search query with additional syntax like `from:me`
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export function augmentSearchQuery(query: string, {did}: {did?: string}) {
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// Don't do anything if there's no DID
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if (!did) {
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return query
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}
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// replace “smart quotes” with normal ones
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// iOS keyboard will add fancy unicode quotes, but only normal ones work
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query = query.replaceAll(/[“”]/g, '"')
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// We don't want to replace substrings that are being "quoted" because those
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// are exact string matches, so what we'll do here is to split them apart
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// Even-indexed strings are unquoted, odd-indexed strings are quoted
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const splits = query.split(/("(?:[^"\\]|\\.)*")/g)
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return splits
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.map((str, idx) => {
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if (idx % 2 === 0) {
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return str.replaceAll(/(^|\s)from:me(\s|$)/g, `$1${did}$2`)
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}
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return str
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})
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.join('')
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}
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