ToJSONVisitor.hpp

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/*
 * Copyright (C) 2017-2018  Christian Berger
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#ifndef CLUON_TOJSONVISITOR_HPP
#define CLUON_TOJSONVISITOR_HPP

#include "cluon/any/any.hpp"
#include "cluon/cluon.hpp"

#include <cstdint>
#include <map>
#include <sstream>
#include <string>

namespace cluon {
class LIBCLUON_API ToJSONVisitor {
   private:
    ToJSONVisitor(const ToJSONVisitor &) = delete;
    ToJSONVisitor(ToJSONVisitor &&)      = delete;
    ToJSONVisitor &operator=(const ToJSONVisitor &) = delete;
    ToJSONVisitor &operator=(ToJSONVisitor &&) = delete;

   public:
    ToJSONVisitor(bool withOuterCurlyBraces = true, const std::map<uint32_t, bool> &mask = {}) noexcept;

    std::string json() const noexcept;

   public:
    // The following methods are provided to allow an instance of this class to
    // be used as visitor for an instance with the method signature void accept<T>(T&);

    void preVisit(int32_t id, const std::string &shortName, const std::string &longName) noexcept;
    void postVisit() noexcept;

    void visit(uint32_t id, std::string &&typeName, std::string &&name, bool &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, char &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, int8_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, uint8_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, int16_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, uint16_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, int32_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, uint32_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, int64_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, uint64_t &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, float &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, double &v) noexcept;
    void visit(uint32_t id, std::string &&typeName, std::string &&name, std::string &v) noexcept;

    template <typename T>
    void visit(uint32_t &id, std::string &&typeName, std::string &&name, T &value) noexcept {
        (void)typeName;
        if ((0 == m_mask.count(id)) || m_mask[id]) {
            try {
                ToJSONVisitor jsonVisitor;
                value.accept(jsonVisitor);
                m_buffer << '\"' << name << '\"' << ':' << jsonVisitor.json() << ',' << '\n';
            } catch (const linb::bad_any_cast &) { // LCOV_EXCL_LINE
            }
        }
    }

   public:
    static std::string encodeBase64(const std::string &input) noexcept;

   private:
    bool m_withOuterCurlyBraces{true};
    std::map<uint32_t, bool> m_mask;
    std::stringstream m_buffer{};
};

} // namespace cluon
#endif