lexer.hpp

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#ifndef _json_lexer_hpp_
#define _json_lexer_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 "common.hpp"
#include "token.hpp"
#include "reader.hpp"

namespace NAMESPACE
{
    class lexer
    {
    public:

        lexer(reader &r, size_t max_token_length);

        virtual ~lexer();

        const token &next();

        void put_back_last();

    private:

        void consume_white_space();

        void read_token();

        void read_number();

        void read_string();

        void read_false();

        void read_true();

        void read_null();

        void read_matching(const char *s);

        void append_to_number_buffer(char *s, size_t &index, int c);
    
        size_t read_digits(size_t &index);

        void throw_number_exception(int c);

        reader &m_reader;

        bool m_last_put_back;

        token m_token;

        size_t m_max_token_length;

        /*
         * Buffer holding the token raw value. This is dynamically allocated so
         * as to avoid placing a very large object on the stack.
         */
        char *m_buffer;
    };
}

#endif