/*
 * Copyright (C) 2011 Tommi Maekitalo
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef CXXTOOLS_JSONPARSER_H
#define CXXTOOLS_JSONPARSER_H

#include <cxxtools/api.h>
#include <cxxtools/string.h>

namespace cxxtools
{
    class DeserializerBase;

    class CXXTOOLS_API JsonParser
    {
            class JsonStringParser
            {
                    String _str;
                    unsigned _count;
                    unsigned short _value;

                    enum
                    {
                        state_0,
                        state_esc,
                        state_hex
                    } _state;

                public:
                    JsonStringParser()
                        : _state(state_0)
                        { }

                    bool advance(Char ch);

                    void clear()
                    { _state = state_0; _str.clear(); }

                    const String& str() const
                    { return _str; }
            };

        public:
            JsonParser();

            void begin(DeserializerBase& handler)
            {
                _state = state_0;
                _token.clear();
                _deserializer = &handler;
            }

            int advance(Char ch); // 1: end character detected; -1: end but char not consumed; 0: no end
            void finish();

        private:
            enum
            {
                state_0,
                state_object,
                state_object_name,
                state_object_after_name,
                state_object_value,
                state_object_e,
                state_object_next_member,
                state_array,
                state_array_value,
                state_array_e,
                state_string,
                state_number,
                state_float,
                state_token,
                state_end
            } _state;

            String _token;

            DeserializerBase* _deserializer;
            JsonStringParser _stringParser;
            JsonParser* _next;
    };
}

#endif // CXXTOOLS_JSONPARSER_H
