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• Is.kt

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

package it.unibo.tuprolog.solve.stdlib.primitive

import it.unibo.tuprolog.core.Substitution
import it.unibo.tuprolog.core.Term
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.function.evalAsExpression
import it.unibo.tuprolog.solve.primitive.BinaryRelation
import it.unibo.tuprolog.solve.primitive.Solve
import it.unibo.tuprolog.unify.Unificator.Companion.mguWith

/**
 * Implementation of 'is'/2 predicate
 *
 * @author Enrico
 */
object Is : BinaryRelation.Functional("is") {

    override fun Solve.Request.computeOneSubstitution(first: Term, second: Term): Substitution =
        ensuringArgumentIsInstantiated(1).run {
            first mguWith second.evalAsExpression(this, 1)
        }
}