weex_core/Source/wson/wson_parser.h

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * c++ friendly interface for wson
 * */
//
// Created by furture on 2018/5/15.
//

#ifndef WSON_PARSER_H
#define WSON_PARSER_H

#include "wson.h"

#include <vector>
#include <string>

typedef std::basic_string<uint16_t, std::char_traits<uint16_t>, std::allocator<uint16_t> > u16string;

/** utf16 support which is so fast and cross javascriptcore java and c plus*/
class wson_parser {

public:
    wson_parser(const char* data);
    wson_parser(const char* data, int length);
    ~wson_parser();

    /**
     * has next type
     * */
    inline bool hasNext(){
        return wson_has_next(this->wsonBuffer);
    }

    /**
     * return value type
     * */
    inline uint8_t nextType(){
        if(wsonBuffer->data && wson_has_next(wsonBuffer)){
            return  wson_next_type(wsonBuffer);
        }
        return WSON_NULL_TYPE;
    }

    /**
     * return back type, move parse postion--;
     * */
    inline void backType(){
        if(wsonBuffer && wsonBuffer->position > 0){
            wsonBuffer->position--;
        }
    }

    /**
     * return is map object
     * */
    inline bool isMap(uint8_t type){
        return type == WSON_MAP_TYPE;
    }

    /**
     * return is array object
     * */
    inline bool isArray(uint8_t type){
        return type == WSON_ARRAY_TYPE;
    }

    /**
     * return is string object
     * */
    inline bool isString(uint8_t type){
        return type == WSON_STRING_TYPE
               || type == WSON_UINT8_STRING_TYPE
               || type == WSON_NUMBER_BIG_INT_TYPE
               || type == WSON_NUMBER_BIG_DECIMAL_TYPE;
    }

    /**
     * return is bool object
     * */
    inline bool isBool(uint8_t type){
        return type == WSON_BOOLEAN_TYPE_FALSE || type == WSON_BOOLEAN_TYPE_TRUE;
    }

    /**
     * return is number object
     * */
    inline bool isNumber(uint8_t type){
        return type == WSON_NUMBER_INT_TYPE
               || type == WSON_NUMBER_FLOAT_TYPE
               || type == WSON_NUMBER_LONG_TYPE
               || type == WSON_NUMBER_DOUBLE_TYPE;
    }

    /**
     * return is null object
     * */
    inline bool isNull(uint8_t type){
        return type == WSON_NULL_TYPE;
    }

    /**
     * return map size
     * */
    inline  int  nextMapSize(){
        return wson_next_uint(wsonBuffer);
    }

    /**
     * return array size
     * */
    inline  int  nextArraySize(){
        return wson_next_uint(wsonBuffer);
    }

    /**
     * auto convert  utf-16 string number to utf-8 string
     * */
    std::string nextMapKeyUTF8();

    /**
     * auto convert object or number to string
     * */
    std::string nextStringUTF8(uint8_t type);

    /**
     * return number value, if type is string convert to number
     * */
    double nextNumber(uint8_t type);

    /** return bool value */
    bool  nextBool(uint8_t type);

    /**
     * skip current value type
     * */
    void skipValue(uint8_t type);


    /**
     * reset to start position
     * */
    inline void  resetState(){
        if(this->wsonBuffer){
            this->wsonBuffer->position = 0;
        }
    }

    /**
     * get current state position
     * */
    inline int getState(){
        return this->wsonBuffer->position;
    }

    /**restore parse to state */
    inline int restoreToState(int state){
        return this->wsonBuffer->position = state;
    }
    
    /** conver wson to json string */
    std::string toStringUTF8();


private:
    wson_buffer* wsonBuffer;
    void toJSONtring(std::string &builder);

    /**reuse buffer for decoding */
    char *requireDecodingBuffer(int length);
    char* decodingBuffer = nullptr;
    int  decodingBufferSize = 0;
};




#endif //WEEX_PROJECT_WSON_PARSER_H