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import React from 'react'
import {Text, TextStyle, StyleProp} from 'react-native'
import {TextLink} from './Link'
import {s} from '../../lib/styles'
import {toShortUrl} from '../../../lib/strings'
type TextSlice = {start: number; end: number}
type Entity = {
index: TextSlice
type: string
value: string
}
export function RichText({
text,
entities,
style,
}: {
text: string
entities?: Entity[]
style?: StyleProp<TextStyle>
}) {
if (!entities?.length) {
return <Text style={style}>{text}</Text>
}
if (!style) style = []
else if (!Array.isArray(style)) style = [style]
entities.sort(sortByIndex)
const segments = Array.from(toSegments(text, entities))
const els = []
let key = 0
for (const segment of segments) {
if (typeof segment === 'string') {
els.push(segment)
} else {
if (segment.entity.type === 'mention') {
els.push(
<TextLink
key={key}
text={segment.text}
href={`/profile/${segment.entity.value}`}
style={[style, s.blue3]}
/>,
)
} else if (segment.entity.type === 'link') {
els.push(
<TextLink
key={key}
text={toShortUrl(segment.text)}
href={segment.entity.value}
style={[style, s.blue3]}
/>,
)
}
}
key++
}
return <Text style={style}>{els}</Text>
}
function sortByIndex(a: Entity, b: Entity) {
return a.index.start - b.index.start
}
function* toSegments(text: string, entities: Entity[]) {
let cursor = 0
let i = 0
do {
let currEnt = entities[i]
if (cursor < currEnt.index.start) {
yield text.slice(cursor, currEnt.index.start)
} else if (cursor > currEnt.index.start) {
i++
continue
}
if (currEnt.index.start < currEnt.index.end) {
let subtext = text.slice(currEnt.index.start, currEnt.index.end)
if (
!subtext.trim() ||
stripUsername(subtext) !== stripUsername(currEnt.value)
) {
// dont yield links to empty strings or strings that don't match the entity value
yield subtext
} else {
yield {
entity: currEnt,
text: subtext,
}
}
}
cursor = currEnt.index.end
i++
} while (i < entities.length)
if (cursor < text.length) {
yield text.slice(cursor, text.length)
}
}
function stripUsername(v: string): string {
return v.trim().replace('@', '')
}
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