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import {AppBskyFeedPost} from '@atproto/api'
type Entity = AppBskyFeedPost.Entity
import {isValidDomain} from './url-helpers'
export function extractEntities(
text: string,
knownHandles?: Set<string>,
): Entity[] | undefined {
let match
let ents: Entity[] = []
{
// mentions
const re = /(^|\s|\()(@)([a-zA-Z0-9.-]+)(\b)/g
while ((match = re.exec(text))) {
if (knownHandles && !knownHandles.has(match[3])) {
continue // not a known handle
} else if (!match[3].includes('.')) {
continue // probably not a handle
}
const start = text.indexOf(match[3], match.index) - 1
ents.push({
type: 'mention',
value: match[3],
index: {start, end: start + match[3].length + 1},
})
}
}
{
// links
const re =
/(^|\s|\()((https?:\/\/[\S]+)|((?<domain>[a-z][a-z0-9]*(\.[a-z0-9]+)+)[\S]*))/gim
while ((match = re.exec(text))) {
let value = match[2]
if (!value.startsWith('http')) {
const domain = match.groups?.domain
if (!domain || !isValidDomain(domain)) {
continue
}
value = `https://${value}`
}
const start = text.indexOf(match[2], match.index)
const index = {start, end: start + match[2].length}
// strip ending puncuation
if (/[.,;!?]$/.test(value)) {
value = value.slice(0, -1)
index.end--
}
if (/[)]$/.test(value) && !value.includes('(')) {
value = value.slice(0, -1)
index.end--
}
ents.push({
type: 'link',
value,
index,
})
}
}
return ents.length > 0 ? ents : undefined
}
interface DetectedLink {
link: string
}
type DetectedLinkable = string | DetectedLink
export function detectLinkables(text: string): DetectedLinkable[] {
const re =
/((^|\s|\()@[a-z0-9.-]*)|((^|\s|\()https?:\/\/[\S]+)|((^|\s|\()(?<domain>[a-z][a-z0-9]*(\.[a-z0-9]+)+)[\S]*)/gi
const segments = []
let match
let start = 0
while ((match = re.exec(text))) {
let matchIndex = match.index
let matchValue = match[0]
if (match.groups?.domain && !isValidDomain(match.groups?.domain)) {
continue
}
if (/\s|\(/.test(matchValue)) {
// HACK
// skip the starting space
// we have to do this because RN doesnt support negative lookaheads
// -prf
matchIndex++
matchValue = matchValue.slice(1)
}
// strip ending puncuation
if (/[.,;!?]$/.test(matchValue)) {
matchValue = matchValue.slice(0, -1)
}
if (/[)]$/.test(matchValue) && !matchValue.includes('(')) {
matchValue = matchValue.slice(0, -1)
}
if (start !== matchIndex) {
segments.push(text.slice(start, matchIndex))
}
segments.push({link: matchValue})
start = matchIndex + matchValue.length
}
if (start < text.length) {
segments.push(text.slice(start))
}
return segments
}
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