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package moe.nea.firmament.features.texturepack
import com.google.gson.JsonElement
import io.github.moulberry.repo.data.Rarity
import moe.nea.firmament.util.useMatch
abstract class RarityMatcher {
abstract fun match(rarity: Rarity): Boolean
companion object {
fun parse(jsonElement: JsonElement): RarityMatcher {
val string = jsonElement.asString
val range = parseRange(string)
if (range != null) return range
return Exact(Rarity.valueOf(string))
}
private val allRarities = Rarity.entries.joinToString("|", "(?:", ")")
private val intervalSpec =
"(?<beginningOpen>[\\[\\(])(?<beginning>$allRarities)?,(?<ending>$allRarities)?(?<endingOpen>[\\]\\)])"
.toPattern()
fun parseRange(string: String): RangeMatcher? {
intervalSpec.useMatch<Nothing>(string) {
// Open in the set-theory sense, meaning does not include its end.
val beginningOpen = group("beginningOpen") == "("
val endingOpen = group("endingOpen") == ")"
val beginning = group("beginning")?.let(Rarity::valueOf)
val ending = group("ending")?.let(Rarity::valueOf)
return RangeMatcher(beginning, !beginningOpen, ending, !endingOpen)
}
return null
}
}
data class Exact(val expected: Rarity) : RarityMatcher() {
override fun match(rarity: Rarity): Boolean {
return rarity == expected
}
}
data class RangeMatcher(
val beginning: Rarity?,
val beginningInclusive: Boolean,
val ending: Rarity?,
val endingInclusive: Boolean,
) : RarityMatcher() {
override fun match(rarity: Rarity): Boolean {
if (beginning != null) {
if (beginningInclusive) {
if (rarity < beginning) return false
} else {
if (rarity <= beginning) return false
}
}
if (ending != null) {
if (endingInclusive) {
if (rarity > ending) return false
} else {
if (rarity >= ending) return false
}
}
return true
}
}
}
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