redAcore/ConfigCore.h

/*
 * ConfigCore.h
 *
 *  Created on: 5 Mar 2017
 *      Author: wentzelc
 */

#ifndef REDACORE_CONFIGCORE_H_
#define REDACORE_CONFIGCORE_H_

// redA Libraries
/* none */

// Standard C/C++ Libraries
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>

//---------------------------------------------------------------------------

typedef enum { jtNull = 0, jtBool = 1, jtInt = 2, jtFloat = 3, jtString = 4, jtArray = 5, jtObject = 6 } EJSONtype;

//---------------------------------------------------------------------------

// Structure prototypes
typedef struct SConfigParam TConfigParam;

// One Config Parameters
struct SConfigParam {
    char            * Name;
    EJSONtype       Type;
    char            * Value;
    int             Len;

    TConfigParam    * Next;
};

//---------------------------------------------------------------------------

class CConfigCore
{
private:
    TConfigParam    * FirstParam;

    // File operation
    FILE    * InputFile;
    char    * Buffer;
    int     BufLen;

    // Parsing operation
    char    * BufEnd;

    char    * BufPos;
    char    * LineMark;
    int     LineNo;

    bool    Error;
    char    ErrorText[100];

    // File Buffer operation
    bool CreateBuffer( int pBufLen );
    bool FillBuffer();
    void FreeBuffer();

    // Parsing functions
    inline void SkipWhiteSpace() {
        while (isspace(*BufPos)) {
            if (*BufPos == '\n') {
                LineMark = BufPos;
                LineNo++;
            }
            BufPos++;
        }
    }
    bool ParseObject( TConfigParam * Object );
    bool ParseString( char ** Value, int * pLen = NULL, EJSONtype * pType = NULL );
    bool ParsePrimitive( char ** Value, int * pLen = NULL, EJSONtype * pType = NULL );

    // Find Param
    inline TConfigParam * GetParam( const char * Name ) {
        TConfigParam     * Param  = FirstParam;
        while (Param && strcasecmp( Param->Name, Name ))
            Param = Param->Next;
        return Param;
    }
    inline TConfigParam ** GetParamPtr( const char * Name ) {
        TConfigParam     ** Param  = &FirstParam;
        while (*Param && strcasecmp( (*Param)->Name, Name ))
            Param = &((*Param)->Next);
        return Param;
    }

    // Create Param
    inline TConfigParam * FindCreateParam( const char * Name ) {
        TConfigParam    ** Param    = NULL;
        if (!*(Param = GetParamPtr( Name ))) {
            *Param  = (TConfigParam *)calloc( 1, sizeof(TConfigParam) );
            (*Param)->Name = (char *)calloc( 1, strlen( Name )+1 );
            strcpy( (*Param)->Name, Name );
        }
        return (*Param);
    }

    // Manage Parameters
    bool SetParam( TConfigParam * Param, EJSONtype Type, const char * Value, const int Len );
    bool DestroyParam( TConfigParam ** Param );

public:
    CConfigCore();
    ~CConfigCore();

    bool SetParamStr( const char * Name, const char * Value = NULL, const int Len = -1 );   // Use Len param if Value contains NULL values
    bool SetParamInt( const char * Name, const long Value );
    bool SetParamFloat( const char * Name, const double Value );
    bool SetParamBool( const char * Name, const bool Value );
    bool SetParamNull( const char * Name );

    const EJSONtype GetParamType( const char * Name );

    const char *    GetParamStr( const char * Name, const char * Default = NULL );
    const char *    GetParamStr( const char * Name, int &Len, const char * Default = NULL );
    const long      GetParamInt( const char * Name, long Default = 0 );
    const double    GetParamFloat( const char * Name, double Default = 0.0 );
    const bool      GetParamBool( const char * Name, bool Default = false );

    bool DeleteParam( const char * Name );
    bool DeleteAll();

    bool LoadFile( const char * FilePath, int pBufLen = 500 );
    bool SaveFile( const char * FilePath, const int ValueTab = 20 );

    const char * GetError() { return ((Error)? ErrorText : "Success"); };
};

#endif /* REDACORE_CONFIGCORE_H_ */