
/*
 *   _____    _ _        .      .    .
 *  |_   _|  | | |  .       .           .
 *    | |  __| | | ___         .    .        .
 *    | | / _` | |/ _ \                .
 *   _| || (_| | |  __/ github.com/Naios/idle
 *  |_____\__,_|_|\___| AGPL v3 (Early Access)
 *
 * Copyright(c) 2018 - 2021 Denis Blank <denis.blank at outlook dot com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef IDLE_CORE_UTIL_TEXT_HPP_INCLUDED
#define IDLE_CORE_UTIL_TEXT_HPP_INCLUDED

#include <idle/core/util/string_view.hpp>

namespace idle {
constexpr StringView trim(StringView str) noexcept {
  auto begin = str.begin();
  auto end = str.end();

  while (begin != end) {
    char const current = *begin;
    if (!(current == ' ' || current == '\n' || current == '\r')) {
      break;
    }

    ++begin;
  }

  while (begin != end) {
    auto previous = end;
    --previous;

    char const current = *previous;
    if (!(current == ' ' || current == '\n' || current == '\r')) {
      break;
    }

    end = previous;
  }

  if (begin == end) {
    return {};
  } else {
    return StringView{&*begin, static_cast<std::size_t>(end - begin)};
  }
}

constexpr StringView operator"" _txt(char const* str,
                                     std::size_t length) noexcept {
  return trim({str, length});
}
} // namespace idle

#endif // IDLE_CORE_UTIL_TEXT_HPP_INCLUDED
