Svyatoslav Kuzmich
46 lines
1.1 KiB
Kotlin
46 lines
1.1 KiB
Kotlin
/*
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* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
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* 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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// Adopted from misc.js
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fun compareTo(a: dynamic, b: dynamic): Int = when (typeOf(a)) {
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"number" -> when {
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typeOf(b) == "number" ->
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doubleCompareTo(a, b)
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b is Long ->
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doubleCompareTo(a, b.toDouble())
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else ->
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primitiveCompareTo(a, b)
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}
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"string", "boolean" -> primitiveCompareTo(a, b)
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else -> compareToDoNotIntrinsicify(a, b)
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}
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@DoNotIntrinsify
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private fun <T : Comparable<T>> compareToDoNotIntrinsicify(a: Comparable<T>, b: T) =
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a.compareTo(b)
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fun primitiveCompareTo(a: dynamic, b: dynamic): Int =
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js("a < b ? -1 : a > b ? 1 : 0").unsafeCast<Int>()
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fun doubleCompareTo(a: dynamic, b: dynamic): Int =
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js("""
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if (a < b) return -1;
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if (a > b) return 1;
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if (a === b) {
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if (a !== 0) return 0;
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var ia = 1 / a;
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return ia === 1 / b ? 0 : (ia < 0 ? -1 : 1);
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}
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return a !== a ? (b !== b ? 0 : 1) : -1
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""").unsafeCast<Int>() |