gapt.provers.viper.aip.axioms.UserDefinedInductionAxioms.scala Maven / Gradle / Ivy

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General Architecture for Proof Theory

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package gapt.provers.viper.aip.axioms

import gapt.expr._
import gapt.expr.formula.Formula
import gapt.proofs.Sequent
import gapt.proofs.context.Context
import gapt.proofs.gaptic.OpenAssumption
import gapt.provers.viper.aip.ThrowsError

case class UserDefinedInductionAxioms(axioms: List[String]) extends AxiomFactory {

  /**
   * Returns user defined induction axioms.
   *
   * @param ctx Defines inductive types etc.
   * @return Either a list of induction axioms or a non empty list of strings describing why induction axioms
   *         could not be generated.
   */
  override def apply(sequent: Sequent[(String, Formula)])(implicit ctx: Context): ThrowsError[List[Axiom]] =
    try {
      Right(
        axioms map { s =>
          new Axiom() {
            val formula = StringContext(s).hof(s)
            val proof = new OpenAssumption(Sequent() :+ ("" -> formula))
          }
        }
      )
    } catch {
      case e: IllegalArgumentException => Left(e.getMessage())
    }
}