ESP8266_swiss_army_board/src/app/CFGFileParser.cpp

#include "CFGFileParser.h"

CFGFileParser::CFGFileParser(SDCardManager &sdCardManager, const char *file):AbstractParser(file), _state(INIT), _type(PARAMETER), _sdCardManager(sdCardManager)
{

}

void *CFGFileParser::parseFile()
{
    //Here is the logic for the file parser
    File file;
    
    CFGDictionary *dictioRef = new CFGDictionary;
    char readChar(0), *parsedParameter(NULL), *parsedValue(NULL);

    file = _sdCardManager.open(_resource);
    if(!file)
    {
      delete dictioRef;
      return NULL;
    }
        
    while(file.available())
    {
      readChar = (char)file.read();
        //Do work
        switch(_state)
        {
        case INIT:
            if(readChar == '#') _state = COMMENT_SECTION;
            else if((readChar >= 65 && readChar <= 90) || (readChar >= 97 && readChar <= 122) || (readChar >= 48 && readChar <= 57))
            {
                _state = PARAM_SECTION;
                parsedParameter = addChar(parsedParameter, readChar);
                if(parsedParameter == NULL)
                    _state = ERROR;
                //printf("%c",readChar);
            }
            else
                _state = ERROR;
            break;
        case COMMENT_SECTION:
            if(readChar == '\r') _state = LINE_BREAK;
            if(readChar == '\n') _state = LINE_BREAK;
            break;
        case LINE_BREAK:
            if(readChar == '#')
                _state = COMMENT_SECTION;
            else if(readChar == '\n') _state = LINE_BREAK;
            else if(readChar == '\r') _state = LINE_BREAK;
            else if((readChar >= 65 && readChar <= 90) || (readChar >= 97 && readChar <= 122) || (readChar >= 48 && readChar <= 57))
            {
                _state = PARAM_SECTION;
                //printf("%c",readChar);
                _type = PARAMETER;
                parsedParameter = addChar(parsedParameter, readChar);
                if(parsedParameter == NULL)
                    _state = ERROR;
            }
            else if(readChar == '\'')
            {
                _state = OPENING_QUOTE;
                _type = PARAMETER;
            }
            else
                _state = ERROR;

            break;
        case PARAM_SECTION:
            if(readChar == '\'')_state = OPENING_QUOTE;
            else if(readChar == ':') _state = SEPARATION;
            else if(readChar == '\n')
            {
                _state = LINE_BREAK;
                if(parsedParameter != NULL)
                {
                    //printf("%s --> %s\n", parsedParameter, parsedValue);
                    dictioRef->addParameter(parsedParameter, parsedValue == NULL ? "":parsedValue);
                    free(parsedParameter);free(parsedValue);
                    parsedParameter = NULL;
                    parsedValue = NULL;
                }
            }
            else if(readChar == '\r')
            {
                _state = LINE_BREAK;
                if(parsedParameter != NULL)
                {
                    //printf("%s --> %s\n", parsedParameter, parsedValue);
                    dictioRef->addParameter(parsedParameter, parsedValue == NULL ? "":parsedValue);
                    free(parsedParameter);free(parsedValue);
                    parsedParameter = NULL;
                    parsedValue = NULL;
                }
            }
            else if(readChar == ' ') _state = PARAM_SECTION;
            else if((readChar >= 65 && readChar <= 90) || (readChar >= 97 && readChar <= 122) || readChar == '_' || (readChar >= 48 && readChar <= 57))
            {
                if(_type == PARAMETER)
                {
                    parsedParameter = addChar(parsedParameter, readChar);
                    if(parsedParameter == NULL)
                        _state = ERROR;
                }
                else
                {
                    parsedValue = addChar(parsedValue, readChar);
                    if(parsedValue == NULL)
                        _state = ERROR;
                }
                //printf("%c",readChar);
            }
            else
                _state = ERROR;
            break;
        case OPENING_QUOTE:
            if(readChar == '\'') _state = PARAM_SECTION;
            else if((readChar >= 65 && readChar <= 90) || (readChar >= 97 && readChar <= 122) || readChar == ' ' || readChar == '_' || (readChar >= 48 && readChar <= 57))
            {
                //printf("%c",readChar);
                if(_type == PARAMETER)
                {
                    parsedParameter = addChar(parsedParameter, readChar);
                    if(parsedParameter == NULL)
                        _state = ERROR;
                }
                else
                {
                    parsedValue = addChar(parsedValue, readChar);
                    if(parsedValue == NULL)
                        _state = ERROR;
                }
            }
            else
                _state = ERROR;

            break;
        case SEPARATION:
            _type = VALUE;
            if(readChar == '\'')_state = OPENING_QUOTE;
            else _state = PARAM_SECTION;
            break;
        case ERROR:
            dictioRef->dispose();
            delete dictioRef;
            free(parsedValue);
            free(parsedParameter);
            parsedValue = NULL;
            parsedParameter = NULL;
            file.close();
            return NULL;
            break;
        }
    }

    file.close();
    return dictioRef;
}

boolean CFGFileParser::save(void *data)
{
    return true;
}

char *CFGFileParser::addChar(char *pointer, const char character)
{
    char *tempAddr = NULL;
    if(pointer == NULL)
    {
        tempAddr = (char *) realloc(pointer, 2*sizeof(char));
        if(tempAddr == NULL)
            return NULL;
        else
        {
            pointer = tempAddr;
            pointer[0] = character;
            pointer[1] = '\0';
        }
    }
    else
    {
        tempAddr = (char *) realloc(pointer, (strlen(pointer)+2)*sizeof(char));
        if(tempAddr == NULL)
        {
            free(pointer);
            return NULL;
        }
        else
        {
            pointer = tempAddr;
            pointer[strlen(pointer)+1] = '\0';
            pointer[strlen(pointer)] = character;
        }
    }

    return pointer;
}