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Code Issues Releases Wiki Activity

Move two more operators into separate classes.

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This commit is contained in:
Danila Fedorin
2017-09-23 16:19:45 -07:00
parent 81d0999c11
commit 579ff78a99
3 changed files with 52 additions and 45 deletions
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32
core/src/main/kotlin/org/nwapw/abacus/plugin/standard/OperatorFactorial.kt Normal file
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package org.nwapw.abacus.plugin.standard
import org.nwapw.abacus.context.MutableEvaluationContext
import org.nwapw.abacus.function.NumberOperator
import org.nwapw.abacus.function.OperatorAssociativity
import org.nwapw.abacus.function.OperatorType
import org.nwapw.abacus.number.NumberInterface
class OperatorFactorial: NumberOperator(OperatorAssociativity.LEFT, OperatorType.UNARY_POSTFIX, 0) {
override fun matchesParams(context: MutableEvaluationContext, params: Array<out NumberInterface>) =
params.size == 1
&& params[0].fractionalPart().compareTo(context.inheritedNumberImplementation.instanceForString("0")) == 0
&& params[0].signum() >= 0
override fun applyInternal(context: MutableEvaluationContext, params: Array<out NumberInterface>): NumberInterface {
val implementation = context.inheritedNumberImplementation
val one = implementation.instanceForString("1")
if (params[0].signum() == 0) {
return one
}
var factorial = params[0]
var multiplier = params[0] - one
//It is necessary to later prevent calls of factorial on anything but non-negative integers.
while (multiplier.signum() == 1) {
factorial *= multiplier
multiplier -= one
}
return factorial
}
}

17
core/src/main/kotlin/org/nwapw/abacus/plugin/standard/OperatorNegate.kt Normal file
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package org.nwapw.abacus.plugin.standard
import org.nwapw.abacus.context.MutableEvaluationContext
import org.nwapw.abacus.function.NumberOperator
import org.nwapw.abacus.function.OperatorAssociativity
import org.nwapw.abacus.function.OperatorType
import org.nwapw.abacus.number.NumberInterface
class OperatorNegate: NumberOperator(OperatorAssociativity.LEFT, OperatorType.UNARY_PREFIX, 0) {
override fun matchesParams(context: MutableEvaluationContext, params: Array<out NumberInterface>) =
params.size == 1
override fun applyInternal(context: MutableEvaluationContext, params: Array<out NumberInterface>) =
-params[0]
}