Is there an existing way of getting regex capture group value by delegate? Maybe it falls under the realm of easy-enough-to-wing-it, or why-would-you-need-it, but something like this in stdlib
operator fun MatchResult.getValue(parent: Nothing?, property: KProperty<*>): String =
groups[property.name]?.value ?: ""
I wanted a nicer way to deal with missing values during serialization, so ended up using this for my deserialization, but I'd love to know what the caveats are
@Serializable(with = PidSerializer::class)
data class Pid(
val first: Digits,
val second: Digits? = null,
)
...
override fun deserialize(decoder: Decoder): Pid =
decoder.decodeString().toOption()
.flatMap { pidPattern.matchEntire(it).toOption() }
.map {
val first by it
val second by it
Pid(first, second.ifBlank { null })
}.getOrNull() ?: throw MissingFieldException("first", "PID")
