TGeoParser.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Definitions/Algebra.hpp"
#include "Acts/Definitions/Units.hpp"
#include "Acts/Utilities/BinningType.hpp"

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "TGeoMatrix.h"

class TGeoNode;
class TGeoVolume;

namespace Acts {

struct TGeoParser {
  using ParseRange = std::pair<double, double>;

  struct SelectedNode {
    // The selected geo node
    const TGeoNode* node = nullptr;
    // The transform to global
    std::unique_ptr<TGeoMatrix> transform = nullptr;
  };

  struct State {
    // The current volume
    TGeoVolume* volume = nullptr;
    // The current node
    TGeoNode* node = nullptr;
    // Bool on branch
    bool onBranch = false;
    // The currently collected nodes
    std::vector<SelectedNode> selectedNodes = {};
  };

  struct Options {
    std::vector<std::string> volumeNames = {};
    std::vector<std::string> targetNames = {};
    std::string localAxes = "XYZ";
    double unit = 1 * UnitConstants::cm;
    std::vector<std::pair<BinningValue, ParseRange> > parseRanges = {};
  };

  static void select(State& state, const Options& options,
                     const TGeoMatrix& gmatrix = TGeoIdentity("ID"));
};

}  // namespace Acts