print.hpp

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// Copyright 2015 TIER IV, 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 OPENSCENARIO_INTERPRETER__UTILITY__PRINT_HPP_
#define OPENSCENARIO_INTERPRETER__UTILITY__PRINT_HPP_
 
#include <iomanip>
#include <iostream>
#include <openscenario_interpreter/type_traits/has_stream_output_operator.hpp>
#include <openscenario_interpreter/type_traits/iterable.hpp>
#include <type_traits>
 
namespace openscenario_interpreter
{
inline namespace utility
{
template <typename T>
auto print_to(std::ostream & os, const T & value)
  -> std::enable_if_t<concepts::HasStreamOutputOperator<T>::value, std::ostream &>
{
  return os << value;
}
 
template <typename T>
auto print_to(std::ostream & os, const T & iterable) -> std::enable_if_t<
  not concepts::HasStreamOutputOperator<T>::value and type_traits::Iterable<T>::value,
  std::ostream &>
{
  os << "[";
  const auto * separator = "";
  for (const auto & value : iterable) {
    os << std::exchange(separator, ", ");
    print_to(os, value);
  }
  return os << "]";
}
 
inline auto print_keys_to = [](auto & os, const auto & xs) -> decltype(auto) {
  if (not xs.empty()) {
    for (auto iter = std::begin(xs); iter != std::end(xs); ++iter) {
      os << std::get<0>(*iter);
      switch (std::distance(iter, std::end(xs))) {
        case 1:
          return os;
        case 2:
          os << " and ";
          break;
        default:
          os << ", ";
          break;
      }
    }
  }
  return os;
};
}  // namespace utility
}  // namespace openscenario_interpreter
 
#endif  // OPENSCENARIO_INTERPRETER__UTILITY__PRINT_HPP_