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The Aya proof assistant

There is a newer version: 0.36.0

// Copyright (c) 2020-2024 Tesla (Yinsen) Zhang.
// Use of this source code is governed by the MIT license that can be found in the LICENSE.md file.
package org.aya.tyck.tycker;

import org.aya.normalize.Finalizer;
import org.aya.normalize.Normalizer;
import org.aya.syntax.core.term.Term;
import org.aya.syntax.literate.CodeOptions;
import org.aya.syntax.ref.MetaVar;
import org.aya.tyck.TyckState;
import org.aya.util.ForLSP;
import org.jetbrains.annotations.NotNull;

import java.util.function.Supplier;

/**
 * Indicating something is {@link TyckState}ful,
 * therefore we can perform weak-head normalizing and Freeze Spell 「 Perfect Freeze 」
 *
 * @see #state()
 * @see #whnf(Term)
 * @see #freezeHoles(Term)
 * @see Contextful
 */
public interface Stateful {
  @NotNull TyckState state();
  default @NotNull Term whnf(@NotNull Term term) {
    return new Normalizer(state()).apply(term);
  }
  /**
   * Does not validate solution.
   */
  default void solve(MetaVar meta, Term solution) {
    state().solve(meta, solution);
  }
  default @NotNull Term freezeHoles(@NotNull Term term) {
    return new Finalizer.Freeze(this).zonk(term);
  }

  @ForLSP default @NotNull Term fullNormalize(Term result) {
    return new Normalizer(state()).normalize(result, CodeOptions.NormalizeMode.FULL);
  }

  default  R withConnection(@NotNull Term lhs, @NotNull Term rhs, @NotNull Supplier action) {
    state().connect(lhs, rhs);
    var result = action.get();
    state().disconnect(lhs, rhs);
    return result;
  }
}