tdpeuter/2025LogProg-project-GhentProlog
tdpeuter/2025LogProg-project-GhentProlog
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This commit is contained in:
Tibo De Peuter 2025-04-11 19:27:01 +02:00
parent e3c84e1761
commit e73e5cbfc8
32 changed files with 1354 additions and 92 deletions
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14
src/prolog/ast/terms/Variable.kt
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@ -1,8 +1,10 @@
package prolog.ast.terms
import prolog.ast.arithmetic.Expression
import prolog.logic.Substituted
import java.util.*
data class Variable(val name: String) : Term {
data class Variable(val name: String) : Term, Expression {
private var alias: Optional<Term> = Optional.empty()
fun alias(): Optional<Term> {
@ -21,6 +23,16 @@ data class Variable(val name: String) : Term {
alias = Optional.empty()
}
override fun evaluate(subs: Substituted): Pair<Term, Substituted> {
// If the variable is bound, return the value of the binding
// If the variable is not bound, return the variable itself
return if (alias.isPresent) {
alias.get().evaluate(subs)
} else {
Pair(this, emptyMap())
}
}
override fun compareTo(other: Term): Int {
return when (other) {
is Variable -> name.compareTo(other.name)