Revert "simplify enrichStatus method by using regexes"

This reverts commit 4644405add.

backend/src/mastodon/microformats.ts

@@ -9,38 +9,66 @@ function tag(name: string, content: string, attrs: Record<string, string> = {}):
 	return `<${name}${htmlAttrs}>${content}</${name}>`
 }
 
-const mentionedEmailRegex = /\s@([^@\s]+@[^.\s]+\.[^.\s]+)\s/g
-const linkRegex = /\s(https?:\/\/[^.\s]+\.[^.\s]+(?:\/[^.\s/]+)*)\s/g
-
 /// Transform a text status into a HTML status; enriching it with links / mentions.
 export function enrichStatus(status: string): string {
-	const enrichedStatus = status
-		.replace(mentionedEmailRegex, (_, email: string) => ` ${getMentionSpan(email)} `)
-		.replace(linkRegex, (_, link: string) => ` ${getLinkAnchor(link)} `)
+	let out = ''
+	let state = 'normal'
+	let buffer = ''
 
-	return tag('p', enrichedStatus)
-}
+	for (let i = 0, len = status.length; i < len; i++) {
+		const char = status[i]
+		if (char === '@') {
+			state = 'mention'
+		}
 
-function getMentionSpan(mentionedEmail: string) {
-	const handle = parseHandle(mentionedEmail)
+		if (status.slice(i, i + 5) === 'http:' || status.slice(i, i + 6) === 'https:') {
+			state = 'link'
+		}
 
-	// TODO: the link to the profile is a guess, we could rely on
-	// the cached Actors to find the right link.
-	const linkToProfile = `https://${handle.domain}/@${handle.localPart}`
+		if (state === 'link') {
+			if (char === ' ') {
+				try {
+					const url = new URL(buffer)
+					buffer = ''
 
-	const mention = `@${tag('span', handle.localPart)}`
-	return tag('span', tag('a', mention, { href: linkToProfile, class: 'u-url mention' }), {
-		class: 'h-card',
-	})
-}
+					out += tag('a', url.hostname + url.pathname, { href: url.href })
+				} catch (err: unknown) {
+					console.warn('failed to parse link', err)
+					out += buffer
+				}
 
-function getLinkAnchor(link: string) {
-	try {
-		const url = new URL(link)
+				out += char
+				state = 'normal'
+			} else {
+				buffer += char
+			}
+			continue
+		}
 
-		return tag('a', url.hostname + url.pathname, { href: url.href })
-	} catch (err: unknown) {
-		console.warn('failed to parse link', err)
-		return link
+		if (state === 'mention') {
+			if (char === ' ') {
+				const handle = parseHandle(buffer)
+				buffer = ''
+
+				// TODO: the link to the profile is a guess, we could rely on
+				// the cached Actors to find the right link.
+				const linkToProfile = `https://${handle.domain}/@${handle.localPart}`
+
+				const mention = '@' + tag('span', handle.localPart)
+				out += tag('span', tag('a', mention, { href: linkToProfile, class: 'u-url mention' }), { class: 'h-card' })
+				out += char
+				state = 'normal'
+			} else {
+				buffer += char
+			}
+			continue
+		}
+
+		if (state === 'normal') {
+			out += char
+			continue
+		}
 	}
+
+	return tag('p', out)
 }