DtGLSLToken.h

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/******************************************************************************
** Copyright (c) 2018 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <cstring>

namespace makVrv 
{
   class DtGLSLToken
   {
   public:
      enum Kind
      {
         TK_EOS,          // End of input stream
         TK_ERROR,        // An error has been encountered
         TK_WHITESPACE,   // A whitespace span (but not newline)
         TK_NEWLINE,      // A single newline (CR & LF)
         TK_LINECONT,     // Line continuation ('\' followed by LF)
         TK_NUMBER,       // A number
         TK_KEYWORD,      // A keyword
         TK_PUNCTUATION,  // A punctuation character
         TK_DIRECTIVE,    // A preprocessor directive
         TK_STRING,       // A string
         TK_COMMENT,      // A block comment
         TK_LINECOMMENT,  // A line comment
         TK_TEXT          // An unparsed text (cannot be returned from GetToken())
      };

      Kind Type;
      mutable size_t Allocated;
      union
      {
         const char *String;
         char *Buffer;
      };
      size_t Length;

      DtGLSLToken();

      DtGLSLToken(Kind iType);

      DtGLSLToken(Kind iType, const char *iString, size_t iLength);

      DtGLSLToken(const DtGLSLToken &iOther);

      ~DtGLSLToken();

      DtGLSLToken &operator = (const DtGLSLToken &iOther);

      void Append(const char *iString, size_t iLength);

      void Append(const DtGLSLToken &iOther);

      void AppendNL(int iCount);

      int CountNL();

      bool GetValue(long &oValue) const;

      void SetValue(long iValue);

      bool operator == (const DtGLSLToken &iOther) const;
   };
}