UTF-8-aligned start to an SRT subtitle group parser.

subtitle_group_parser_utf8_fix.swift

let timecodeHours = Prefix(2).pipe(Int.parser(isSigned: false)).utf8 // ⇐
let timecodeMinutes = Prefix(2).pipe(Int.parser(isSigned: false)).utf8 // ⇐
let timecodeSeconds = Prefix(2).pipe(Int.parser(isSigned: false)).utf8 // ⇐
let timecodeMilliseconds = Prefix(3).pipe(Int.parser(isSigned: false)).utf8 // ⇐

let timecodeParser = timecodeHours
	.skip(StartsWith(":".utf8)) // ⇐
	.take(timecodeMinutes)
	.skip(StartsWith(":".utf8)) // ⇐
	.take(timecodeSeconds)
	.skip(StartsWith(",".utf8)) // ⇐
	.take(timecodeMilliseconds)
	.map { hours, minutes, seconds, milliseconds -> TimeInterval in
		let hoursInSeconds = Double(hours) * 60 * 60
		let minutesInSeconds = Double(minutes) * 60
		let millisecondsInSeconds = Double(milliseconds) * 1 / 1_000

		return hoursInSeconds + minutesInSeconds + Double(seconds) + millisecondsInSeconds
	}

let timecodeLineParser = timecodeParser
	.skip(StartsWith(" --> ".utf8)) // ⇐
	.take(timecodeParser)

let srtGroupParser = Int.parser(isSigned: false)
	.skip(Newline())
	.take(timecodeLineParser)
	.skip(Newline()) // ✅ Back in compilin’ order.
	// …