FXJSON.h

/********************************************************************************
*                                                                               *
*                      J S O N   R e a d e r  &  W r i t e r                    *
*                                                                               *
*********************************************************************************
* Copyright (C) 2013,2024 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* 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 3 of the License, or             *
* (at your option) any later version.                                           *
*                                                                               *
* 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 program.  If not, see <http://www.gnu.org/licenses/>          *
********************************************************************************/
#ifndef FXJSON_H
#define FXJSON_H

#ifndef FXPARSEBUFFER_H
#include "FXParseBuffer.h"
#endif

namespace FX {


class FXAPI FXJSON : public FXParseBuffer {
public:

  enum Error {
    ErrOK,              
    ErrSave,            
    ErrLoad,            
    ErrToken,           
    ErrColon,           
    ErrComma,           
    ErrBracket,         
    ErrBrace,           
    ErrQuotes,          
    ErrQuote,           
    ErrNumber,          
    ErrIdent,           
    ErrDuplicate,       
    ErrEnd              
    };

  enum Flow {
    Stream,             
    Compact,            
    Pretty              
    };
protected:
  enum Token {
    TK_ERROR,
    TK_EOF,
    TK_COMMA,
    TK_COLON,
    TK_IDENT,
    TK_NAN,
    TK_INF,
    TK_NULL,
    TK_FALSE,
    TK_TRUE,
    TK_STRING,
    TK_PLUS,
    TK_MINUS,
    TK_INT,
    TK_HEX,
    TK_REAL,
    TK_LBRACK,
    TK_LBRACE,
    TK_RBRACK,
    TK_RBRACE
    };
protected:
  FXString  value;      // Token value
  FXlong    offset;     // Position from start
  Token     token;      // Token
  FXint     column;     // Column number
  FXint     indent;     // Indent level
  FXint     line;       // Line number
  FXint     wrap;       // Line wrap column
  FXchar    quote;      // Quote type used
  FXuchar   flow;       // Output flow
  FXuchar   prec;       // Float precision
  FXuchar   fmt;        // Float format
  FXuchar   esc;        // Escape mode
  FXuchar   dent;       // Indentation amount
  FXuchar   ver;        // Version
protected:
  static const FXchar *const errors[];
protected:
  virtual Token next();
  Token ident();
  Token string();
  static Token identoken(const FXString& str);
  Error loadMap(FXVariant& var);
  Error loadArray(FXVariant& var);
  Error loadVariant(FXVariant& var);
  Error saveString(const FXString& str);
  Error saveIdent(const FXString& str);
  Error saveMap(const FXVariant& var);
  Error saveArray(const FXVariant& var);
  Error saveVariant(const FXVariant& var);
private:
  FXJSON(const FXJSON&);
  FXJSON &operator=(const FXJSON&);
public:

  FXJSON();

  FXJSON(FXchar* buffer,FXuval sz=8192,Direction d=Load);

  FXbool open(FXchar* buffer=nullptr,FXuval sz=8192,Direction d=Load);

  FXint getLine() const { return line; }

  FXint getColumn() const { return column; }

  FXlong getOffset() const { return offset; }

  virtual Error load(FXVariant& variant);

  virtual Error save(const FXVariant& variant);

  static const FXchar* getError(Error err){ return errors[err]; }

  void setNumericPrecision(FXuchar p){ prec=p; }
  FXuchar getNumericPrecision() const { return prec; }

  void setNumericFormat(FXuchar f){ fmt=f; }
  FXuchar getNumericFormat() const { return fmt; }

  void setOutputFlow(FXuchar f){ flow=f; }
  FXuchar getOutputFlow() const { return flow; }

  void setIndentation(FXuchar d){ dent=d; }
  FXuchar getIndentation() const { return dent; }

  void setLineWrap(FXint w){ wrap=w; }
  FXint getLineWrap() const { return wrap; }

  void setEscapeMode(FXuchar e){ esc=e; }
  FXuchar getEscapeMode() const { return esc; }

  void setVersion(FXuchar v){ ver=v; }
  FXuchar getVersion() const { return ver; }

  void setQuote(FXchar q){ quote=q; }
  FXchar getQuote() const { return quote; }

  FXbool close();

  virtual ~FXJSON();
  };

}

#endif