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Change Duration.toString scientific exponent formatting

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- use 'e+' for positive exponents in scientific format
This commit is contained in:
Ilya Gorbunov
2019-06-17 16:28:07 +03:00
parent a5b7c270ae
commit a2b1c537af
3 changed files with 17 additions and 12 deletions
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libraries/stdlib/jvm/src/kotlin/time/formatToDecimals.kt
+8 -3
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@@ -11,10 +11,11 @@ import java.text.DecimalFormatSymbols
import java.util.*
import kotlin.concurrent.getOrSet
private val rootFormatSymbols = DecimalFormatSymbols(Locale.ROOT).apply { exponentSeparator = "e" }
private val rootNegativeExpFormatSymbols = DecimalFormatSymbols(Locale.ROOT).apply { exponentSeparator = "e" }
private val rootPositiveExpFormatSymbols = DecimalFormatSymbols(Locale.ROOT).apply { exponentSeparator = "e+" }
private val precisionFormats = Array(4) { ThreadLocal<DecimalFormat>() }
private fun createFormatForDecimals(decimals: Int) = DecimalFormat("0", rootFormatSymbols).apply {
private fun createFormatForDecimals(decimals: Int) = DecimalFormat("0", rootNegativeExpFormatSymbols).apply {
if (decimals > 0) minimumFractionDigits = decimals
roundingMode = RoundingMode.HALF_UP
}
@@ -34,4 +35,8 @@ internal actual fun formatUpToDecimals(value: Double, decimals: Int): String =
private val scientificFormat = ThreadLocal<DecimalFormat>()
internal actual fun formatScientific(value: Double): String =
scientificFormat.getOrSet { DecimalFormat("0E0", rootFormatSymbols).apply { minimumFractionDigits = 2 } }.format(value)
scientificFormat.getOrSet { DecimalFormat("0E0", rootNegativeExpFormatSymbols).apply { minimumFractionDigits = 2 } }
.apply {
decimalFormatSymbols = if (value >= 1 || value <= -1) rootPositiveExpFormatSymbols else rootNegativeExpFormatSymbols
}
.format(value)