utf8.hpp

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#ifndef _json_utf8_hpp_
#define _json_utf8_hpp_

/*
 * Copyright (c) 2017 Andrew Haisley
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


#include <memory>
#include <string>

#include "common.hpp"

namespace NAMESPACE
{
    class utf8
    {
    public:

        static std::unique_ptr<std::string> json_string_to_utf8(const std::string &src);

        static std::unique_ptr<std::string> utf8_to_json_string(const std::string &src);

    private:

        static char next_char(const std::string &s, size_t &index);

        static unsigned int from_hex(char c);

        static char to_hex(unsigned int i);

        static void set_and_check_unicode_byte(std::string &dst, size_t &dst_index, char c);

        static void parse_unicode(
                const std::string &src, 
                size_t            &src_index, 
                std::string       &dst,
                size_t            &dst_index);

        static char32_t parse_hex(
                const std::string &src, 
                size_t            &src_index);

        static unsigned int utf8_length(uint8_t c);

        static bool valid_unicode(char32_t uc);

        static void add_hex_string(std::unique_ptr<std::string> &dst, char32_t uc);
    };
}

#endif