gapt.expr.formula.fol.FOLHead.scala Maven / Gradle / Ivy

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General Architecture for Proof Theory

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package gapt.expr.formula.fol

import gapt.expr.Const
import gapt.expr.Expr
import gapt.expr.formula.NonLogicalConstant
import gapt.expr.ty.Ty

private[expr] class FOLHead(ret: Ty) {
  def apply(sym: String, arity: Int): Const =
    Const(sym, FOLHeadType(ret, arity))
  def unapply(e: Expr): Option[(String, Int)] = e match {
    case NonLogicalConstant(sym, FOLHeadType(`ret`, arity), Nil) => Some((sym, arity))
    case _                                                       => None
  }
}