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package io.dico.parcels2.blockvisitor
import io.dico.parcels2.util.Region
import io.dico.parcels2.util.Vec3i
import kotlin.coroutines.experimental.SequenceBuilder
import kotlin.coroutines.experimental.buildIterator
enum class RegionTraversal(private val builder: suspend SequenceBuilder<Vec3i>.(Region) -> Unit) {
DOWNWARD({ region ->
val origin = region.origin
val size = region.size
repeat(size.y) { y ->
repeat(size.z) { z ->
repeat(size.x) { x ->
yield(origin.add(x, size.y - y - 1, z))
}
}
}
}),
UPWARD({ region ->
val origin = region.origin
val size = region.size
repeat(size.y) { y ->
repeat(size.z) { z ->
repeat(size.x) { x ->
yield(origin.add(x, y, z))
}
}
}
}),
;
fun regionTraverser(region: Region) = Iterable { buildIterator { builder(region) } }
}
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