ExpressionHelpers.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#ifndef O2_FRAMEWORK_EXPRESSIONS_HELPERS_H_
#define O2_FRAMEWORK_EXPRESSIONS_HELPERS_H_
#include "Framework/Expressions.h"
 
#include <iosfwd>
#include <fmt/format.h>
 
namespace o2::framework::expressions
{
 
struct DatumSpec {
  using datum_t = std::variant<std::monostate, size_t, LiteralNode::var_t, std::string>;
  datum_t datum = std::monostate{};
  size_t hash = 0;
  atype::type type = atype::NA;
 
  explicit constexpr DatumSpec(size_t index, atype::type type_) : datum{index}, type{type_} {}
  explicit constexpr DatumSpec(LiteralNode::var_t literal, atype::type type_) : datum{literal}, type{type_} {}
  explicit constexpr DatumSpec(std::string binding, size_t hash_, atype::type type_) : datum{binding}, hash{hash_}, type{type_} {}
  DatumSpec() = default;
  DatumSpec(DatumSpec const&) = default;
  DatumSpec(DatumSpec&&) = default;
  DatumSpec& operator=(DatumSpec const&) = default;
  DatumSpec& operator=(DatumSpec&&) = default;
 
  bool operator==(DatumSpec const& rhs) const
  {
    bool eqValue = this->datum == rhs.datum;
    bool eqHash = true;
    if (this->datum.index() == 3 && eqValue) {
      eqHash = this->hash == rhs.hash;
    }
    bool eqType = this->type == rhs.type;
    return eqValue && eqHash && eqType;
  }
};
 
std::ostream& operator<<(std::ostream& os, DatumSpec const& spec);
 
struct ColumnOperationSpec {
  size_t index = 0;
  BasicOp op;
  DatumSpec left;
  DatumSpec right;
  DatumSpec condition;
  DatumSpec result;
  atype::type type = atype::NA;
  ColumnOperationSpec() = default;
  explicit ColumnOperationSpec(BasicOp op_, size_t index_ = 0)
    : index{index_},
      op{op_},
      left{},
      right{},
      condition{},
      result{}
  {
    switch (op) {
      case BasicOp::LogicalOr:
      case BasicOp::LogicalAnd:
      case BasicOp::LessThan:
      case BasicOp::LessThanOrEqual:
      case BasicOp::GreaterThan:
      case BasicOp::GreaterThanOrEqual:
      case BasicOp::Equal:
      case BasicOp::NotEqual:
        type = atype::BOOL;
        break;
      case BasicOp::Division:
        type = atype::FLOAT;
      default:
        type = atype::NA;
    }
    result.type = type;
  }
};
} // namespace o2::framework::expressions
 
#endif // O2_FRAMEWORK_EXPRESSIONS_HELPERS_H_