File: Rule4b.h

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//
//
//  Copyright (C) 2020 Schrödinger, LLC
//
//   @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//
#pragma once

#include <vector>

#include "SequenceRule.h"

namespace RDKit {
namespace CIPLabeler {

/**
 * A descriptor pair rule. This rule defines that like descriptor pairs have
 * priority over unlike descriptor pairs.
 *
 */
class Rule4b : public SequenceRule {
 public:
  Rule4b();

  Rule4b(Descriptor ref);

  int compare(const Edge *a, const Edge *b) const override;

 private:
  const Descriptor d_ref = Descriptor::NONE;

  std::vector<Descriptor> getReferenceDescriptors(const Node *node) const;

  bool hasDescriptors(const Node *node) const;

  bool getReference(const std::vector<const Node *> &nodes,
                    std::vector<Descriptor> &result) const;

  std::vector<std::vector<const Node *>> initialLevel(const Node *node) const;

  std::vector<std::vector<const Node *>> getNextLevel(
      const std::vector<std::vector<const Node *>> &prevLevel) const;

  std::vector<const Node *> toNodeList(
      const std::vector<Edge *> &eqEdges) const;

  std::vector<PairList> newPairLists(
      const std::vector<Descriptor> &descriptors) const;

  void fillPairs(const Node *beg, PairList &plist) const;

  int comparePairs(const Node *a, const Node *b, Descriptor refA,
                   Descriptor refB) const;

  Sort getRefSorter(const SequenceRule *replacement_rule) const;
};

}  // namespace CIPLabeler
}  // namespace RDKit