Artem Kobzar
72 lines
2.2 KiB
Kotlin
72 lines
2.2 KiB
Kotlin
/*
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* Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.js
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internal fun implement(vararg interfaces: dynamic): BitMask {
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var maxSize = 1
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val masks = js("[]")
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for (i in interfaces) {
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var currentSize = maxSize
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val imask: BitMask? = i.prototype.`$imask$` ?: i.`$imask$`
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if (imask != null) {
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masks.push(imask)
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currentSize = imask.intArray.size
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}
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val iid: Int? = i.`$metadata$`.iid
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val iidImask: BitMask? = iid?.let { BitMask(arrayOf(it)) }
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if (iidImask != null) {
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masks.push(iidImask)
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currentSize = JsMath.max(currentSize, iidImask.intArray.size)
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}
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if (currentSize > maxSize) {
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maxSize = currentSize
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}
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}
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val resultIntArray = IntArray(maxSize) { i ->
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masks.reduce({ acc: Int, it: BitMask ->
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if (i >= it.intArray.size)
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acc
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else
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acc or it.intArray[i]
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}, 0)
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}
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val result = BitMask(emptyArray())
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result.intArray = resultIntArray
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return result
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}
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internal class BitMask(activeBits: Array<Int>) {
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var intArray: IntArray = run {
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if (activeBits.size == 0) {
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IntArray(0)
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} else {
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val max: Int = JsMath.asDynamic().max.apply(null, activeBits)
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val intArray = IntArray((max shr 5) + 1)
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for (activeBit in activeBits) {
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val numberIndex = activeBit shr 5
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val positionInNumber = activeBit and 31
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val numberWithSettledBit = 1 shl positionInNumber
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intArray[numberIndex] = intArray[numberIndex] or numberWithSettledBit
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}
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intArray
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}
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}
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fun isBitSet(possibleActiveBit: Int): Boolean {
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val numberIndex = possibleActiveBit shr 5
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if (numberIndex > intArray.size) return false
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val positionInNumber = possibleActiveBit and 31
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val numberWithSettledBit = 1 shl positionInNumber
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return intArray[numberIndex] and numberWithSettledBit != 0
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}
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} |