valentina/src/libs/qmuparser/qmuparsertokenreader.h

/***************************************************************************************************
 **
 **  Original work Copyright (C) 2013 Ingo Berg
 **  Modified work Copyright 2014 Roman Telezhynskyi <dismine(at)gmail.com>
 **
 **  Permission is hereby granted, free of charge, to any person obtaining a copy of this
 **  software and associated documentation files (the "Software"), to deal in the Software
 **  without restriction, including without limitation the rights to use, copy, modify,
 **  merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 **  permit persons to whom the Software is furnished to do so, subject to the following conditions:
 **
 **  The above copyright notice and this permission notice shall be included in all copies or
 **  substantial portions of the Software.
 **
 **  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 **  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 **  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 **  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 **  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 **
 ******************************************************************************************************/

#ifndef QMUPARSERTOKENREADER_H
#define QMUPARSERTOKENREADER_H

#include <cassert>
#include <cstdio>
#include <cstring>
#include <list>
#include <map>
#include <memory>
#include <stack>
#include <string>

#include "qmuparserdef.h"
#include "qmuparsertoken.h"

/** @file
    @brief This file contains the parser token reader definition.
*/


namespace qmu
{
  // Forward declaration
  class QmuParserBase;

  /** @brief Token reader for the ParserBase class.

  */
  class QmuParserTokenReader
  {
  private:

      typedef QmuParserToken<qreal, QString> token_type;

  public:

      QmuParserTokenReader(QmuParserBase *a_pParent);
      QmuParserTokenReader* Clone(QmuParserBase *a_pParent) const;

      void AddValIdent(identfun_type a_pCallback);
      void SetVarCreator(facfun_type a_pFactory, void *pUserData);
      void SetFormula(const QString &a_strFormula);
      void SetArgSep(char_type cArgSep);

      int GetPos() const;
      const QString &GetExpr() const;
      varmap_type& GetUsedVar();
      QChar GetArgSep() const;

      void IgnoreUndefVar(bool bIgnore);
      void ReInit();
      token_type ReadNextToken();

  private:

      /** @brief Syntax codes. 
  	
	        The syntax codes control the syntax check done during the first time parsing of 
          the expression string. They are flags that indicate which tokens are allowed next
          if certain tokens are identified.
  	  */
      enum ESynCodes
      {
        noBO      = 1 << 0,  ///< to avoid i.e. "cos(7)(" 
        noBC      = 1 << 1,  ///< to avoid i.e. "sin)" or "()"
        noVAL     = 1 << 2,  ///< to avoid i.e. "tan 2" or "sin(8)3.14"
        noVAR     = 1 << 3,  ///< to avoid i.e. "sin a" or "sin(8)a"
        noARG_SEP = 1 << 4,  ///< to avoid i.e. ",," or "+," ...
        noFUN     = 1 << 5,  ///< to avoid i.e. "sqrt cos" or "(1)sin"	
        noOPT     = 1 << 6,  ///< to avoid i.e. "(+)"
        noPOSTOP  = 1 << 7,  ///< to avoid i.e. "(5!!)" "sin!"
	      noINFIXOP = 1 << 8,  ///< to avoid i.e. "++4" "!!4"
        noEND     = 1 << 9,  ///< to avoid unexpected end of formula
        noSTR     = 1 << 10, ///< to block numeric arguments on string functions
        noASSIGN  = 1 << 11, ///< to block assignement to constant i.e. "4=7"
        noIF      = 1 << 12,
        noELSE    = 1 << 13,
        sfSTART_OF_LINE = noOPT | noBC | noPOSTOP | noASSIGN | noIF | noELSE | noARG_SEP,
        noANY     = ~0       ///< All of he above flags set
      };	

      QmuParserTokenReader(const QmuParserTokenReader &a_Reader);
      QmuParserTokenReader& operator=(const QmuParserTokenReader &a_Reader);
      void Assign(const QmuParserTokenReader &a_Reader);

      void SetParent(QmuParserBase *a_pParent);
      int ExtractToken(const QString &a_szCharSet, QString &a_strTok, int a_iPos) const;
      int ExtractOperatorToken(QString &a_sTok, int a_iPos) const;

      bool IsBuiltIn(token_type &a_Tok);
      bool IsArgSep(token_type &a_Tok);
      bool IsEOF(token_type &a_Tok);
      bool IsInfixOpTok(token_type &a_Tok);
      bool IsFunTok(token_type &a_Tok);
      bool IsPostOpTok(token_type &a_Tok);
      bool IsOprt(token_type &a_Tok);
      bool IsValTok(token_type &a_Tok);
      bool IsVarTok(token_type &a_Tok);
      bool IsStrVarTok(token_type &a_Tok);
      bool IsUndefVarTok(token_type &a_Tok);
      bool IsString(token_type &a_Tok);
      void Error(EErrorCodes a_iErrc,
                 int a_iPos = -1,
                 const QString &a_sTok = QString() ) const;

      token_type& SaveBeforeReturn(const token_type &tok);

      QmuParserBase *m_pParser;
      QString m_strFormula;
      int  m_iPos;
      int  m_iSynFlags;
      bool m_bIgnoreUndefVar;

      const funmap_type *m_pFunDef;
      const funmap_type *m_pPostOprtDef;
      const funmap_type *m_pInfixOprtDef;
      const funmap_type *m_pOprtDef;
      const valmap_type *m_pConstDef;
      const strmap_type *m_pStrVarDef;
      varmap_type *m_pVarDef;  ///< The only non const pointer to parser internals
      facfun_type m_pFactory;
      void *m_pFactoryData;
      std::list<identfun_type> m_vIdentFun; ///< Value token identification function
      varmap_type m_UsedVar;
      qreal m_fZero;      ///< Dummy value of zero, referenced by undefined variables
      int m_iBrackets;
      token_type m_lastTok;
      QChar m_cArgSep;     ///< The character used for separating function arguments
  };
} // namespace qmu

#endif