[WASM] Implement std kotlin.time

libraries/stdlib/wasm/src/kotlin/time/Duration.kt

@@ -1,9 +1,38 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+
 package kotlin.time
 
+import kotlin.math.*
+
 internal actual inline val durationAssertionsEnabled: Boolean get() = true
-internal actual fun formatToExactDecimals(value: Double, decimals: Int): String = TODO("Wasm stdlib: Duration")
+
-internal actual fun formatUpToDecimals(value: Double, decimals: Int): String = TODO("Wasm stdlib: Duration")
+@JsFun("(value, decimals) => value.toFixed(decimals)")
+private external fun toFixed(value: Double, decimals: Int): String
+
+@JsFun("(value, decimals) => value.toPrecision(decimals)")
+private external fun toPrecision(value: Double, decimals: Int): String
+
+internal actual fun formatToExactDecimals(value: Double, decimals: Int): String {
+    val rounded = if (decimals == 0) {
+        value
+    } else {
+        val pow = (10.0).pow(decimals)
+        round(abs(value) * pow) / pow * sign(value)
+        round(abs(value) * pow) / pow * sign(value)
+    }
+    return if (abs(rounded) < 1e21) {
+        // toFixed switches to scientific format after 1e21
+        toFixed(rounded, decimals)
+    } else {
+        // toPrecision outputs the specified number of digits, but only for positive numbers
+        val positive = abs(rounded)
+        val positiveString = toPrecision(positive, ceil(log10(positive)).toInt() + decimals)
+        if (rounded < 0) "-$positiveString" else positiveString
+    }
+}
+
+@JsFun("(value, decimals) => value.toLocaleString(\"en-us\", ({\"maximumFractionDigits\": decimals}))")
+external internal actual fun formatUpToDecimals(value: Double, decimals: Int): String

libraries/stdlib/wasm/src/kotlin/time/DurationUnit.kt

@@ -1,55 +1,77 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package kotlin.time
 
-
-/**
- * The list of possible time measurement units, in which a duration can be expressed.
- *
- * The smallest time unit is [NANOSECONDS] and the largest is [DAYS], which corresponds to exactly 24 [HOURS].
- */
 @SinceKotlin("1.6")
 @WasExperimental(ExperimentalTime::class)
-public actual enum class DurationUnit {
+public actual enum class DurationUnit(internal val scale: Double) {
     /**
      * Time unit representing one nanosecond, which is 1/1000 of a microsecond.
      */
-    NANOSECONDS,
+    NANOSECONDS(1e0),
     /**
      * Time unit representing one microsecond, which is 1/1000 of a millisecond.
      */
-    MICROSECONDS,
+    MICROSECONDS(1e3),
     /**
      * Time unit representing one millisecond, which is 1/1000 of a second.
      */
-    MILLISECONDS,
+    MILLISECONDS(1e6),
     /**
      * Time unit representing one second.
      */
-    SECONDS,
+    SECONDS(1e9),
     /**
      * Time unit representing one minute.
      */
-    MINUTES,
+    MINUTES(60e9),
     /**
      * Time unit representing one hour.
      */
-    HOURS,
+    HOURS(3600e9),
     /**
      * Time unit representing one day, which is always equal to 24 hours.
      */
-    DAYS;
+    DAYS(86400e9);
 }
 
-/** Converts the given time duration [value] expressed in the specified [sourceUnit] into the specified [targetUnit]. */
 @SinceKotlin("1.3")
-internal actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double = TODO("Wasm stdlib: convertDurationUnit Double")
+internal actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
+    val sourceCompareTarget = sourceUnit.scale.compareTo(targetUnit.scale)
+    return when {
+        sourceCompareTarget > 0 -> value * (sourceUnit.scale / targetUnit.scale)
+        sourceCompareTarget < 0 -> value / (targetUnit.scale / sourceUnit.scale)
+        else -> value
+    }
+}
 
 @SinceKotlin("1.5")
-internal actual fun convertDurationUnitOverflow(value: Long, sourceUnit: DurationUnit, targetUnit: DurationUnit): Long = TODO("Wasm stdlib: convertDurationUnitOverflow Long")
+internal actual fun convertDurationUnitOverflow(value: Long, sourceUnit: DurationUnit, targetUnit: DurationUnit): Long {
+    val sourceCompareTarget = sourceUnit.scale.compareTo(targetUnit.scale)
+    return when {
+        sourceCompareTarget > 0 -> value * (sourceUnit.scale / targetUnit.scale).toLong()
+        sourceCompareTarget < 0 -> value / (targetUnit.scale / sourceUnit.scale).toLong()
+        else -> value
+    }
+}
 
 @SinceKotlin("1.5")
-internal actual fun convertDurationUnit(value: Long, sourceUnit: DurationUnit, targetUnit: DurationUnit): Long = TODO("Wasm stdlib: convertDurationUnit Long")
+internal actual fun convertDurationUnit(value: Long, sourceUnit: DurationUnit, targetUnit: DurationUnit): Long {
+    val sourceCompareTarget = sourceUnit.scale.compareTo(targetUnit.scale)
+    return when {
+        sourceCompareTarget > 0 -> {
+            val scale = (sourceUnit.scale / targetUnit.scale).toLong()
+            val result = value * scale
+            when {
+                result / scale == value -> result
+                value > 0 -> Long.MAX_VALUE
+                else -> Long.MIN_VALUE
+            }
+        }
+        sourceCompareTarget < 0 -> value / (targetUnit.scale / sourceUnit.scale).toLong()
+        else -> value
+    }
+}

libraries/stdlib/wasm/src/kotlin/time/TimeSources.kt

@@ -1,11 +1,29 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+
 package kotlin.time
 
+import kotlin.wasm.internal.ExternalInterfaceType
+
+@JsFun("() => typeof globalThis !== 'undefined' && typeof globalThis.performance !== 'undefined' ? globalThis.performance : null")
+private external fun tryGetPerformance(): ExternalInterfaceType?
+
+@JsFun("(performance) => performance.now()")
+private external fun getPerformanceNow(performance: ExternalInterfaceType): Double
+
+@JsFun("() => Date.now()")
+private external fun dateNow(): Double
+
 @SinceKotlin("1.3")
 @ExperimentalTime
-internal actual object MonotonicTimeSource : TimeSource {
+internal actual object MonotonicTimeSource : TimeSource, AbstractDoubleTimeSource(unit = DurationUnit.MILLISECONDS) {
-    override fun markNow(): TimeMark = TODO("Wasm stdlib: MonotonicTimeSource::markNow")
+    private val performance: ExternalInterfaceType? = tryGetPerformance()
+
+    override fun read(): Double =
+        if (performance != null) getPerformanceNow(performance) else dateNow()
+
+    override fun toString(): String =
+        if (performance != null) "TimeSource(globalThis.performance.now())" else "TimeSource(Date.now())"
 }