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• 0.12.0
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• ArithmeticRelation.kt

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commonMain.it.unibo.tuprolog.solve.primitive.ArithmeticRelation.kt Maven / Gradle / Ivy

package it.unibo.tuprolog.solve.primitive

import it.unibo.tuprolog.core.Numeric
import it.unibo.tuprolog.core.Term
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.function.evalAsArithmeticExpression

/** Base class for implementing arithmetic relation between [Numeric] terms */
abstract class ArithmeticRelation(operator: String) : BinaryRelation.Predicative(operator) {

    final override fun Solve.Request.compute(first: Term, second: Term): Boolean {
        ensuringAllArgumentsAreInstantiated()
        return evaluateAndCompute(first, second)
    }

    private fun Solve.Request.evaluateAndCompute(x: Term, y: Term): Boolean =
        computeNumeric(x.evalAsArithmeticExpression(this, 0), y.evalAsArithmeticExpression(this, 1))

    abstract fun computeNumeric(x: Numeric, y: Numeric): Boolean
}