muParserToken.h

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/*
                 __________                                      
    _____   __ __\______   \_____  _______  ______  ____ _______ 
   /     \ |  |  \|     ___/\__  \ \_  __ \/  ___/_/ __ \\_  __ \
  |  Y Y  \|  |  /|    |     / __ \_|  | \/\___ \ \  ___/ |  | \/
  |__|_|  /|____/ |____|    (____  /|__|  /____  > \___  >|__|   
        \/                       \/            \/      \/        
  Copyright (C) 2004-2008 Ingo Berg

  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 MU_PARSER_TOKEN_H
#define MU_PARSER_TOKEN_H

#include <cassert>
#include <string>
#include <stack>
#include <vector>
#include <memory>

#include "muParserError.h"
#include "muParserCallback.h"

namespace mu
{
  template<typename TBase, typename TString>
  class ParserToken
  {
  public:

      enum ETokFlags
            {
              flVOLATILE = 1    
            };

  private:

      ECmdCode  m_iCode;  
      ETypeCode m_iType;
      void  *m_pTok;      
          int  m_iFlags;      
      int  m_iIdx;        
      TString m_strTok;   
      TString m_strVal;   
      value_type m_fVal;
      std::auto_ptr<ParserCallback> m_pCallback;

  public:

      //---------------------------------------------------------------------------
      ParserToken()
        :m_iCode(cmUNKNOWN)
        ,m_iType(tpVOID)
        ,m_pTok(0)
        ,m_iFlags(0)
        ,m_iIdx(-1)
        ,m_strTok()
        ,m_pCallback()
      {}

      //------------------------------------------------------------------------------
      ParserToken(const ParserToken &a_Tok)
      {
        Assign(a_Tok);
      }
      
      //------------------------------------------------------------------------------
      ParserToken& operator=(const ParserToken &a_Tok)
      {
        Assign(a_Tok);
        return *this;
      }

      //------------------------------------------------------------------------------
      void Assign(const ParserToken &a_Tok)
      {
        m_iCode = a_Tok.m_iCode;
        m_pTok = a_Tok.m_pTok;
        m_iFlags = a_Tok.m_iFlags;
        m_strTok = a_Tok.m_strTok;
        m_iIdx = a_Tok.m_iIdx;
        m_strVal = a_Tok.m_strVal;
        m_iType = a_Tok.m_iType;
        m_fVal = a_Tok.m_fVal;
        // create new callback object if a_Tok has one 
        m_pCallback.reset(a_Tok.m_pCallback.get() ? a_Tok.m_pCallback->Clone() : 0);
      }

      //------------------------------------------------------------------------------
      void AddFlags(int a_iFlags)
      {
        m_iFlags |= a_iFlags;
      }

      //------------------------------------------------------------------------------
      bool IsFlagSet(int a_iFlags) const
      {
        #if defined(_MSC_VER)
          #pragma warning( disable : 4800 )
        #endif
          
        return (bool)(m_iFlags & a_iFlags);

        #if defined(_MSC_VER)
          #pragma warning( default : 4800 ) // int: Variable set to boolean value (may degrade performance)
        #endif
      }

      //------------------------------------------------------------------------------
      ParserToken& Set(ECmdCode a_iType, const TString &a_strTok=TString())
      {
        // The following types cant be set this way, they have special Set functions
        assert(a_iType!=cmVAR);
        assert(a_iType!=cmVAL);
        assert(a_iType!=cmFUNC);

        m_iCode = a_iType;
        m_iType = tpVOID;
        m_pTok = 0;
        m_iFlags = 0;
        m_strTok = a_strTok;
        m_iIdx = -1;

        return *this;
      }

      //------------------------------------------------------------------------------
      ParserToken& Set(const ParserCallback &a_pCallback, const TString &a_sTok)
      {
        assert(a_pCallback.GetAddr());

        m_iCode = a_pCallback.GetCode();
        m_iType = tpVOID;
        m_strTok = a_sTok;
        m_pCallback.reset(new ParserCallback(a_pCallback));

        m_pTok = 0;
        m_iFlags = 0;
        m_iIdx = -1;
        
        if (!m_pCallback->IsOptimizable())
          AddFlags(flVOLATILE);

        return *this;
      }

      //------------------------------------------------------------------------------
      ParserToken& SetVal(TBase a_fVal, const TString &a_strTok=TString())
      {
        m_iCode = cmVAL;
        m_iType = tpDBL;
        m_fVal = a_fVal;
        m_iFlags = 0;
        m_strTok = a_strTok;
        m_iIdx = -1;
        
        m_pTok = 0;
        m_pCallback.reset(0);

        return *this;
      }

      //------------------------------------------------------------------------------
      ParserToken& SetVar(TBase *a_pVar, const TString &a_strTok)
      {
        m_iCode = cmVAR;
        m_iType = tpDBL;
        m_iFlags = 0;
        m_strTok = a_strTok;
        m_iIdx = -1;
        m_pTok = (void*)a_pVar;
        m_pCallback.reset(0);

        AddFlags(ParserToken::flVOLATILE);
        return *this;
      }

      //------------------------------------------------------------------------------
      ParserToken& SetString(const TString &a_strTok, std::size_t a_iSize)
      {
        m_iCode = cmSTRING;
        m_iType = tpSTR;
        m_iFlags = 0;
        m_strTok = a_strTok;
        m_iIdx = static_cast<int>(a_iSize);

        m_pTok = 0;
        m_pCallback.reset(0);

        AddFlags(ParserToken::flVOLATILE);
        return *this;
      }

      //------------------------------------------------------------------------------
      void SetIdx(int a_iIdx)
      {
        if (m_iCode!=cmSTRING || a_iIdx<0)
                throw ParserError(ecINTERNAL_ERROR);
        
        m_iIdx = a_iIdx;
      }

      //------------------------------------------------------------------------------
      int GetIdx() const
      {
        if (m_iIdx<0 || m_iCode!=cmSTRING )
          throw ParserError(ecINTERNAL_ERROR);

        return m_iIdx;
      }

      //------------------------------------------------------------------------------
      ECmdCode GetCode() const
      {
        if (m_pCallback.get())
        {
          return m_pCallback->GetCode();
        }
        else
        {
          return m_iCode;
        }
      }

      //------------------------------------------------------------------------------
      ETypeCode GetType() const
      {
        if (m_pCallback.get())
        {
          return m_pCallback->GetType();
        }
        else
        {
          return m_iType;
        }
      }
      
      //------------------------------------------------------------------------------
      int GetPri() const
      {
        if ( !m_pCallback.get())
                throw ParserError(ecINTERNAL_ERROR);
            
        if ( m_pCallback->GetCode()!=cmOPRT_BIN && m_pCallback->GetCode()!=cmOPRT_INFIX)
                throw ParserError(ecINTERNAL_ERROR);

        return m_pCallback->GetPri();
      }

      //------------------------------------------------------------------------------
      void* GetFuncAddr() const
      {
        return (m_pCallback.get()) ? m_pCallback->GetAddr() : 0;
      }

      //------------------------------------------------------------------------------
      TBase GetVal() const
      {
        switch (m_iCode)
        {
          case cmVAL:  return m_fVal;
          case cmVAR:  return *((TBase*)m_pTok);
          default:     throw ParserError(ecVAL_EXPECTED);
        }
      }

      //------------------------------------------------------------------------------
      TBase* GetVar() const
      {
        if (m_iCode!=cmVAR)
                throw ParserError(ecINTERNAL_ERROR);

        return (TBase*)m_pTok;
      }

      //------------------------------------------------------------------------------
      int GetArgCount() const
      {
        assert(m_pCallback.get());

        if (!m_pCallback->GetAddr())
                throw ParserError(ecINTERNAL_ERROR);

        return m_pCallback->GetArgc();
      }

      //------------------------------------------------------------------------------
      const TString& GetAsString() const
      {
        return m_strTok;
      }
  };
} // namespace mu

#endif