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Merge pull request #262 from kleis-technology/feature/improve-number-…
…display utility class to display a numeric value
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src/main/kotlin/ch/kleis/lcaplugin/ui/toolwindow/FloatingPointRepresentation.kt
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package ch.kleis.lcaplugin.ui.toolwindow | ||
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import arrow.core.flatten | ||
import arrow.core.replicate | ||
import com.intellij.util.containers.tail | ||
import kotlin.math.* | ||
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data class FloatingPointRepresentation( | ||
val isPositive: Boolean, | ||
val digits: List<Int>, | ||
val positionalExponent: Int, | ||
val nbSignificantDigits: Int, | ||
) { | ||
companion object { | ||
fun of(value: Double, nbSignificantDigits: Int = 3): FloatingPointRepresentation { | ||
if (value == 0.0) { | ||
return FloatingPointRepresentation( | ||
true, | ||
IntRange(1, nbSignificantDigits).map { 0 }, | ||
0, | ||
nbSignificantDigits | ||
) | ||
} | ||
val isPositive = value > 0.0 | ||
val w = abs(value) | ||
val e = ceil(log10(w)).toInt() | ||
val positionalExponent = | ||
if (w == 10.0.pow(e)) e | ||
else e - 1 | ||
val shift = nbSignificantDigits - positionalExponent | ||
val reversedDigits = ArrayList<Int>() | ||
var u = floor(w * (10.0.pow(shift))).toInt() | ||
while (u > 0) { | ||
reversedDigits.add(u.mod(10)) | ||
u /= 10 | ||
} | ||
val digits = reversedDigits.reversed().take(nbSignificantDigits) | ||
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if (digits.tail().take(nbSignificantDigits - 1).all { it == 9 }) { | ||
val hd = digits[0] | ||
if (hd == 9) { | ||
val zeros = listOf(0).replicate(nbSignificantDigits - 2).flatten() | ||
return FloatingPointRepresentation( | ||
isPositive, | ||
listOf(1, 0) + zeros, | ||
positionalExponent + 1, | ||
nbSignificantDigits | ||
) | ||
} | ||
val zeros = listOf(0).replicate(nbSignificantDigits - 1).flatten() | ||
return FloatingPointRepresentation( | ||
isPositive, | ||
listOf(hd + 1) + zeros, | ||
positionalExponent, | ||
nbSignificantDigits | ||
) | ||
} | ||
return FloatingPointRepresentation(isPositive, digits, positionalExponent, nbSignificantDigits) | ||
} | ||
} | ||
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override fun toString(): String { | ||
return when (positionalExponent) { | ||
in -2..-1 -> { | ||
val hd = listOf(0).replicate(-positionalExponent - 1).flatten() | ||
.joinToString("") | ||
.let { "0.$it" } | ||
val tl = digits.take(nbSignificantDigits - positionalExponent + 1) | ||
.dropLastWhile { it == 0 } | ||
.joinToString("") | ||
val sign = if (isPositive) "" else "-" | ||
"$sign$hd$tl" | ||
} | ||
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in 0..2 -> { | ||
val midpoint = min(positionalExponent + 1, nbSignificantDigits) | ||
val hd = digits.subList(0, midpoint) | ||
.joinToString("") | ||
val tl = digits.subList(midpoint, nbSignificantDigits) | ||
.dropLastWhile { it == 0 } | ||
.joinToString("") | ||
.let { if (it.isEmpty()) "" else ".$it" } | ||
val sign = if (isPositive) "" else "-" | ||
"$sign$hd$tl" | ||
} | ||
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else -> { | ||
val hd = digits.subList(0, 1) | ||
.joinToString("") | ||
val tl = digits.subList(1, nbSignificantDigits) | ||
.dropLastWhile { it == 0 } | ||
.joinToString("") | ||
.let { if (it.isEmpty()) "" else ".$it" } | ||
val sign = if (isPositive) "" else "-" | ||
val e = "E$positionalExponent" | ||
"$sign$hd$tl$e" | ||
} | ||
} | ||
} | ||
} |
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68 changes: 68 additions & 0 deletions
68
src/test/kotlin/ch/kleis/lcaplugin/ui/toolwindow/DisplayedNumberTest.kt
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package ch.kleis.lcaplugin.ui.toolwindow | ||
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import org.junit.Assert.assertEquals | ||
import org.junit.Test | ||
import org.junit.runner.RunWith | ||
import org.junit.runners.Parameterized | ||
import org.junit.runners.Parameterized.Parameters | ||
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@RunWith(Parameterized::class) | ||
class DisplayedNumberTest( | ||
private val value: Double, | ||
private val expected: String, | ||
) { | ||
companion object { | ||
@Parameters | ||
@JvmStatic | ||
fun getDisplayedStrings(): Collection<Array<Any>> { | ||
return listOf( | ||
arrayOf(0.0, "0"), | ||
arrayOf(0.0001, "1E-4"), | ||
arrayOf(0.001, "1E-3"), | ||
arrayOf(0.01, "0.01"), | ||
arrayOf(0.1, "0.1"), | ||
arrayOf(1.0, "1"), | ||
arrayOf(10.0, "10"), | ||
arrayOf(100.0, "100"), | ||
arrayOf(1000.0, "1E3"), | ||
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arrayOf(0.000999, "1E-3"), | ||
arrayOf(0.00999, "0.01"), | ||
arrayOf(0.0999, "0.1"), | ||
arrayOf(0.999, "1"), | ||
arrayOf(9.99, "10"), | ||
arrayOf(99.9, "100"), | ||
arrayOf(999.0, "1E3"), | ||
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arrayOf(0.00123, "1.23E-3"), | ||
arrayOf(0.0123, "0.0123"), | ||
arrayOf(0.123, "0.123"), | ||
arrayOf(1.2345, "1.23"), | ||
arrayOf(12.345, "12.3"), | ||
arrayOf(123.45, "123"), | ||
arrayOf(1234.5, "1.23E3"), | ||
arrayOf(12345.123, "1.23E4"), | ||
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arrayOf(-0.0, "0"), | ||
arrayOf(-0.00123, "-1.23E-3"), | ||
arrayOf(-0.0123, "-0.0123"), | ||
arrayOf(-0.123, "-0.123"), | ||
arrayOf(-1.2345, "-1.23"), | ||
arrayOf(-12.345, "-12.3"), | ||
arrayOf(-123.45, "-123"), | ||
arrayOf(-1234.5, "-1.23E3"), | ||
arrayOf(-12345.123, "-1.23E4"), | ||
) | ||
} | ||
} | ||
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@Test | ||
fun run() { | ||
// when | ||
val actual = FloatingPointRepresentation.of(value).toString() | ||
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// then | ||
assertEquals(expected, actual) | ||
} | ||
} |
123 changes: 123 additions & 0 deletions
123
src/test/kotlin/ch/kleis/lcaplugin/ui/toolwindow/FloatingPointRepresentationTest.kt
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package ch.kleis.lcaplugin.ui.toolwindow | ||
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import org.junit.runner.RunWith | ||
import org.junit.runners.Parameterized | ||
import org.junit.runners.Parameterized.Parameters | ||
import org.junit.Test | ||
import kotlin.test.assertEquals | ||
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private fun digits(s: String): List<Int> { | ||
return s.map { Integer.parseInt(it.toString()) } | ||
} | ||
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@RunWith(Parameterized::class) | ||
class FloatingPointRepresentationTest( | ||
private val value: Double, | ||
private val expected: FloatingPointRepresentation, | ||
) { | ||
companion object { | ||
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@Parameters | ||
@JvmStatic | ||
fun getFloatingPointRepresentationSamples(): Collection<Array<Any>> { | ||
return listOf( | ||
arrayOf(0.0012345, FloatingPointRepresentation(true, digits("123"), -3, 3)), | ||
arrayOf(0.012345, FloatingPointRepresentation(true, digits("123"), -2, 3)), | ||
arrayOf(0.12345, FloatingPointRepresentation(true, digits("123"), -1, 3)), | ||
arrayOf(1.2345, FloatingPointRepresentation(true, digits("123"), 0, 3)), | ||
arrayOf(12.345, FloatingPointRepresentation(true, digits("123"), 1, 3)), | ||
arrayOf(123.45, FloatingPointRepresentation(true, digits("123"), 2, 3)), | ||
arrayOf(1234.5, FloatingPointRepresentation(true, digits("123"), 3, 3)), | ||
arrayOf(12345.0, FloatingPointRepresentation(true, digits("123"), 4, 3)), | ||
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arrayOf(0.0, FloatingPointRepresentation(true, digits("000"), 0, 3)), | ||
arrayOf(0.0001, FloatingPointRepresentation(true, digits("100"), -4, 3)), | ||
arrayOf(0.001, FloatingPointRepresentation(true, digits("100"), -3, 3)), | ||
arrayOf(0.01, FloatingPointRepresentation(true, digits("100"), -2, 3)), | ||
arrayOf(0.1, FloatingPointRepresentation(true, digits("100"), -1, 3)), | ||
arrayOf(1.0, FloatingPointRepresentation(true, digits("100"), 0, 3)), | ||
arrayOf(10.0, FloatingPointRepresentation(true, digits("100"), 1, 3)), | ||
arrayOf(100.0, FloatingPointRepresentation(true, digits("100"), 2, 3)), | ||
arrayOf(1000.0, FloatingPointRepresentation(true, digits("100"), 3, 3)), | ||
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arrayOf(0.000999, FloatingPointRepresentation(true, digits("100"), -3, 3)), | ||
arrayOf(0.00999, FloatingPointRepresentation(true, digits("100"), -2, 3)), | ||
arrayOf(0.0999, FloatingPointRepresentation(true, digits("100"), -1, 3)), | ||
arrayOf(0.999, FloatingPointRepresentation(true, digits("100"), 0, 3)), | ||
arrayOf(9.99, FloatingPointRepresentation(true, digits("100"), 1, 3)), | ||
arrayOf(99.9, FloatingPointRepresentation(true, digits("100"), 2, 3)), | ||
arrayOf(999.0, FloatingPointRepresentation(true, digits("100"), 3, 3)), | ||
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arrayOf(0.001001, FloatingPointRepresentation(true, digits("100"), -3, 3)), | ||
arrayOf(0.01001, FloatingPointRepresentation(true, digits("100"), -2, 3)), | ||
arrayOf(0.1001, FloatingPointRepresentation(true, digits("100"), -1, 3)), | ||
arrayOf(1.001, FloatingPointRepresentation(true, digits("100"), 0, 3)), | ||
arrayOf(10.01, FloatingPointRepresentation(true, digits("100"), 1, 3)), | ||
arrayOf(100.1, FloatingPointRepresentation(true, digits("100"), 2, 3)), | ||
arrayOf(1001.0, FloatingPointRepresentation(true, digits("100"), 3, 3)), | ||
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arrayOf(0.0002999, FloatingPointRepresentation(true, digits("300"), -4, 3)), | ||
arrayOf(0.003999, FloatingPointRepresentation(true, digits("400"), -3, 3)), | ||
arrayOf(0.04999, FloatingPointRepresentation(true, digits("500"), -2, 3)), | ||
arrayOf(0.5999, FloatingPointRepresentation(true, digits("600"), -1, 3)), | ||
arrayOf(6.999, FloatingPointRepresentation(true, digits("700"), 0, 3)), | ||
arrayOf(79.99, FloatingPointRepresentation(true, digits("800"), 1, 3)), | ||
arrayOf(899.9, FloatingPointRepresentation(true, digits("900"), 2, 3)), | ||
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arrayOf(-0.0012345, FloatingPointRepresentation(false, digits("123"), -3, 3)), | ||
arrayOf(-0.012345, FloatingPointRepresentation(false, digits("123"), -2, 3)), | ||
arrayOf(-0.12345, FloatingPointRepresentation(false, digits("123"), -1, 3)), | ||
arrayOf(-1.2345, FloatingPointRepresentation(false, digits("123"), 0, 3)), | ||
arrayOf(-12.345, FloatingPointRepresentation(false, digits("123"), 1, 3)), | ||
arrayOf(-123.45, FloatingPointRepresentation(false, digits("123"), 2, 3)), | ||
arrayOf(-1234.5, FloatingPointRepresentation(false, digits("123"), 3, 3)), | ||
arrayOf(-12345.0, FloatingPointRepresentation(false, digits("123"), 4, 3)), | ||
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arrayOf(-0.0, FloatingPointRepresentation(true, digits("000"), 0, 3)), | ||
arrayOf(-0.0001, FloatingPointRepresentation(false, digits("100"), -4, 3)), | ||
arrayOf(-0.001, FloatingPointRepresentation(false, digits("100"), -3, 3)), | ||
arrayOf(-0.01, FloatingPointRepresentation(false, digits("100"), -2, 3)), | ||
arrayOf(-0.1, FloatingPointRepresentation(false, digits("100"), -1, 3)), | ||
arrayOf(-1.0, FloatingPointRepresentation(false, digits("100"), 0, 3)), | ||
arrayOf(-10.0, FloatingPointRepresentation(false, digits("100"), 1, 3)), | ||
arrayOf(-100.0, FloatingPointRepresentation(false, digits("100"), 2, 3)), | ||
arrayOf(-1000.0, FloatingPointRepresentation(false, digits("100"), 3, 3)), | ||
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arrayOf(-0.000999, FloatingPointRepresentation(false, digits("100"), -3, 3)), | ||
arrayOf(-0.00999, FloatingPointRepresentation(false, digits("100"), -2, 3)), | ||
arrayOf(-0.0999, FloatingPointRepresentation(false, digits("100"), -1, 3)), | ||
arrayOf(-0.999, FloatingPointRepresentation(false, digits("100"), 0, 3)), | ||
arrayOf(-9.99, FloatingPointRepresentation(false, digits("100"), 1, 3)), | ||
arrayOf(-99.9, FloatingPointRepresentation(false, digits("100"), 2, 3)), | ||
arrayOf(-999.0, FloatingPointRepresentation(false, digits("100"), 3, 3)), | ||
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arrayOf(-0.001001, FloatingPointRepresentation(false, digits("100"), -3, 3)), | ||
arrayOf(-0.01001, FloatingPointRepresentation(false, digits("100"), -2, 3)), | ||
arrayOf(-0.1001, FloatingPointRepresentation(false, digits("100"), -1, 3)), | ||
arrayOf(-1.001, FloatingPointRepresentation(false, digits("100"), 0, 3)), | ||
arrayOf(-10.01, FloatingPointRepresentation(false, digits("100"), 1, 3)), | ||
arrayOf(-100.1, FloatingPointRepresentation(false, digits("100"), 2, 3)), | ||
arrayOf(-1001.0, FloatingPointRepresentation(false, digits("100"), 3, 3)), | ||
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arrayOf(-0.0002999, FloatingPointRepresentation(false, digits("300"), -4, 3)), | ||
arrayOf(-0.003999, FloatingPointRepresentation(false, digits("400"), -3, 3)), | ||
arrayOf(-0.04999, FloatingPointRepresentation(false, digits("500"), -2, 3)), | ||
arrayOf(-0.5999, FloatingPointRepresentation(false, digits("600"), -1, 3)), | ||
arrayOf(-6.999, FloatingPointRepresentation(false, digits("700"), 0, 3)), | ||
arrayOf(-79.99, FloatingPointRepresentation(false, digits("800"), 1, 3)), | ||
arrayOf(-899.9, FloatingPointRepresentation(false, digits("900"), 2, 3)), | ||
) | ||
} | ||
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} | ||
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@Test | ||
fun run() { | ||
// when | ||
val actual = FloatingPointRepresentation.of(value, 3) | ||
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// then | ||
assertEquals(expected, actual, "value = $value") | ||
} | ||
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} |
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