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

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Resolution-agnostic API for logic solvers

There is a newer version: 1.0.4

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

import it.unibo.tuprolog.core.Atom
import it.unibo.tuprolog.core.Integer
import it.unibo.tuprolog.core.Substitution
import it.unibo.tuprolog.core.Term
import it.unibo.tuprolog.core.Var
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.exception.error.InstantiationError
import it.unibo.tuprolog.solve.exception.error.TypeError
import it.unibo.tuprolog.solve.primitive.BinaryRelation
import it.unibo.tuprolog.solve.primitive.Solve
import it.unibo.tuprolog.core.List as LogicList

object AtomCodes : BinaryRelation.Functional("atom_codes") {
    override fun Solve.Request.computeOneSubstitution(
        first: Term,
        second: Term,
    ): Substitution =
        when (first) {
            is Var -> {
                ensuringArgumentIsInstantiated(1)
                ensuringArgumentIsList(1)
                val codeList = second as LogicList
                val chars: List =
                    codeList.toList().map {
                        when (it) {
                            is Integer -> {
                                ensuringTermIsCharCode(it)
                                it.intValue.toChar()
                            }
                            is Var -> {
                                throw InstantiationError.forArgument(context, signature, it, 1)
                            }
                            else -> {
                                throw TypeError.forArgument(context, signature, TypeError.Expected.INTEGER, it, 1)
                            }
                        }
                    }
                Substitution.of(first, Atom.of(chars.joinToString(separator = "")))
            }
            else -> {
                ensuringArgumentIsInstantiated(0)
                ensuringArgumentIsAtom(0)
                if (second !is Var) {
                    ensuringArgumentIsList(1)
                }
                val charArray = (first as Atom).value
                val result = LogicList.of(charArray.map { Integer.of(it.code) })
                mgu(second, result)
            }
        }
}