/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FRUIT_PROOF_TREE_COMPARISON_H
#define FRUIT_PROOF_TREE_COMPARISON_H
#if !FRUIT_EXTRA_DEBUG && !FRUIT_IN_META_TEST
#error "This file should only be included in debug mode or in tests."
#endif
namespace fruit {
namespace impl {
namespace meta {
// Checks whether Proof is entailed by Forest, i.e. whether there is a corresponding Proof1 in Forest with the same
// thesis
// and with the same hypotheses as Proof (or a subset).
struct IsProofEntailedByForest {
template <typename ProofTh, typename ProofHps, typename Forest>
struct apply {
using ForestHps = FindInMap(Forest, ProofTh);
using type = If(IsNone(ForestHps), Bool<false>, IsContained(ForestHps, ProofHps));
};
};
struct IsForestEntailedByForest {
template <typename EntailedForest, typename Forest>
struct apply {
struct Helper {
template <typename CurrentResult, typename EntailedProof>
struct apply;
template <typename CurrentResult, typename EntailedProofTh, typename EntailedProofHps>
struct apply<CurrentResult, Pair<EntailedProofTh, EntailedProofHps>> {
using type = And(CurrentResult, IsProofEntailedByForest(EntailedProofTh, EntailedProofHps, Forest));
};
};
using type = FoldVector(EntailedForest, Helper, Bool<true>);
};
};
// Given two proof trees, check if they are equal.
// Only for debugging.
struct IsProofTreeEqualTo {
template <typename Proof1, typename Proof2>
struct apply {
using type = And(IsSame(typename Proof1::First, typename Proof2::First),
IsSameSet(typename Proof1::Second, typename Proof2::Second));
};
};
// Given two proofs forests, check if they are equal.
// This is not very efficient, consider re-implementing if it will be used often.
// Only for debugging.
struct IsForestEqualTo {
template <typename Forest1, typename Forest2>
struct apply {
using type = And(IsForestEntailedByForest(Forest1, Forest2), IsForestEntailedByForest(Forest2, Forest1));
};
};
// Only for debugging, similar to checking IsProofEntailedByForest but gives a detailed error.
// Only for debugging.
struct CheckProofEntailedByForest {
template <typename ProofTh, typename ProofHps, typename Forest>
struct apply {
using ForestHps = FindInMap(Forest, ProofTh);
using type = If(IsNone(ForestHps),
ConstructError(ProofNotEntailedByForestBecauseThNotFoundErrorTag, ProofTh, GetMapKeys(Forest)),
If(IsContained(ForestHps, ProofHps), Bool<true>,
ConstructError(ProofNotEntailedByForestBecauseHpsNotASubsetErrorTag, ForestHps, ProofHps,
SetDifference(ForestHps, ProofHps))));
};
};
// Only for debugging, similar to checking IsProofEntailedByForest but gives a detailed error.
// Only for debugging.
struct CheckForestEntailedByForest {
template <typename EntailedForest, typename Forest>
struct apply {
struct Helper {
template <typename CurrentResult, typename EntailedProof>
struct apply;
template <typename CurrentResult, typename EntailedProofTh, typename EntailedProofHps>
struct apply<CurrentResult, Pair<EntailedProofTh, EntailedProofHps>> {
using type = PropagateError(CurrentResult,
CheckProofEntailedByForest(EntailedProofTh, EntailedProofHps, Forest));
};
};
using type = FoldVector(EntailedForest, Helper, Bool<true>);
};
};
// Given two proofs forests, check if they are equal.
// This is not very efficient, consider re-implementing if it will be used often.
// Only for debugging.
struct CheckForestEqualTo {
template <typename Forest1, typename Forest2>
struct apply {
using type = PropagateError(CheckForestEntailedByForest(Forest1, Forest2),
CheckForestEntailedByForest(Forest2, Forest1));
};
};
} // namespace meta
} // namespace impl
} // namespace fruit
#endif // FRUIT_PROOF_TREE_COMPARISON_H