// This file is part of Cait <https://github.com/Fuwn/cait>.
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
// SPDX-License-Identifier: GPL-3.0-only

#include "lexer.hh"

namespace cait {

lexer::lexer(std::ifstream &file) {
  std::string line;
  std::size_t line_number = 1;

  for (;;) {
    while (std::getline(file, line)) {
      std::vector<token> token_line;

      this->_lines.push_back(line);

    start:
      std::istringstream line_stream(line);
      std::string word;
      std::size_t character = 1;

      while (std::getline(line_stream, word, ' ')) {
        if (word.empty()) {
          continue;
        }

        token_line.emplace_back(line_number, character, character + word.size(),
                                word);

        character += word.size() + 1;
      }

      if (word == "$") {
        token_line.pop_back();
        std::getline(file, line);

        goto start;
      }

      this->_tree.push_back(token_line);

      line_number += 1;
    }

    break;
  }
}

auto lexer::tree() -> token_tree & { return this->_tree; }

auto lexer::lines() -> const std::vector<std::string> & { return this->_lines; }

} // namespace cait