writer.hpp

/*
 * CoNLL-U - https://github.com/tugrulgungor/CoNLL-U
 *
 * Copyright (c) 2026. All rights reserved.
 * Tuğrul Güngör - https://conll-u.tugrulgungor.me
 *
 * Distributed under the MIT License.
 * https://opensource.org/license/mit/
 */

 
#ifndef TG_CONLLU_WRITER_HPP
#define TG_CONLLU_WRITER_HPP 1
 
#include "conllu/treebank.hpp"
 
#include <filesystem>
#include <ostream>
 
namespace tg::conllu {
    struct WriterOptions final {
        char empty_value_indicator{'_'};
    };

    class Writer final {
        WriterOptions options_{};
 
        [[nodiscard]] static std::error_code write_columns_(std::ostream &output, const Treebank *treebank) noexcept;
        [[nodiscard]] std::error_code write_sentence_(std::ostream &output, const Sentence *sentence) const noexcept;
        [[nodiscard]] static std::error_code write_token_(std::ostream &output, const Token *token) noexcept;
        [[nodiscard]] std::error_code write_word_(std::ostream &output, const Word *word) const noexcept;
 
        static std::ostream &write_(std::ostream &output) noexcept(false);
 
    public:
        constexpr Writer() noexcept = default;
        explicit(true) constexpr Writer(WriterOptions options) noexcept;
        [[nodiscard]] std::error_code write(const Treebank *treebank, std::ostream &&stream) const noexcept;
        [[nodiscard]] std::error_code write_file(const Treebank *treebank,
                                                 const std::filesystem::path &path) const noexcept;
        constexpr ~Writer() noexcept = default;
    };
} // namespace tg::conllu
 
#include "conllu/impl/writer.ipp"
 
#endif // TG_CONLLU_WRITER_HPP