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parse.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2006 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/gob/parse.h $
 * $Id: parse.h 22568 2006-05-21 21:18:23Z wjpalenstijn $
 *
 */
#ifndef GOB_PARSE_H
#define GOB_PARSE_H

namespace Gob {

class Parse {
public:
      void skipExpr(char stopToken);
      void printExpr(char stopToken);
      void printVarIndex(void);
      virtual int16 parseVarIndex(void) = 0;
      virtual int16 parseValExpr(unsigned stopToken=99) = 0;
      virtual int16 parseExpr(char stopToken, byte *resultPtr) = 0;
      
      Parse(GobEngine *vm);
      virtual ~Parse() {};

protected:
      enum PointerType {
            kExecPtr = 0,
            kInterVar = 1,
            kResStr = 2
      };

      GobEngine *_vm;

      int32 encodePtr(char *ptr, int type);
      char *decodePtr(int32 n);

      void printExpr_internal(char stopToken);
};

class Parse_v1 : public Parse {
public:
      Parse_v1(GobEngine *vm);
      virtual ~Parse_v1() {};

      virtual int16 parseVarIndex(void);
      virtual int16 parseValExpr(unsigned stopToken=99);
      virtual int16 parseExpr(char stopToken, byte *resultPtr);
};

class Parse_v2 : public Parse_v1 {
public:
      Parse_v2(GobEngine *vm);
      virtual ~Parse_v2() {};

      virtual int16 parseVarIndex(void);
      virtual int16 parseValExpr(unsigned stopToken=99);
      virtual int16 parseExpr(char stopToken, byte *resultPtr);
};

}                       // End of namespace Gob

#endif

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