unit dpgrtl.types;

interface
uses
   Generics.Collections,
   System.SysUtils;

const
   // -------------------------------------------------------------------------
   // autogen values
   // -------------------------------------------------------------------------
   AUTOGEN_INVALID   = 0;
   AUTOGEN_NONE      = 1;
   AUTOGEN_CARET     = 2;
   AUTOGEN_BANG      = 3;

   // -------------------------------------------------------------------------
   // predefined token types
   // -------------------------------------------------------------------------
   TT_SKIP           = $FF;
   TT_INVALID        =  0;
   TT_EOF            =  1;
   TT_NTLA           =  2;    // null tree lookahead
   TT_USER           =  4;

   EOF_CHAR          = #0;

type
   TByteSet       = set of 0..255;
   TCharSet       = set of AnsiChar;
   TCharMatrix    = array of array of AnsiChar;

   TTokenNameMap  = TDictionary<integer,AnsiString>;

   // ===================================================================================
   // IToken interface
   // ===================================================================================
   IToken = interface
      ['{BFB516D6-7175-40C8-9AA0-592CA11AD391}']

      function    GetTokenType   : byte;
      function    GetTokenText   : AnsiString;
      function    GetTokenLine   : integer;
      function    GetTokenColumn : integer;

      procedure   SetTokenType(     Value: byte);
      procedure   SetTokenText(     Value: AnsiString);
      procedure   SetTokenLine(     Value: integer);
      procedure   SetTokenColumn(   Value: integer);

      function    Clone: IToken;

      property    TokenType   : byte         read  GetTokenType   write SetTokenType;
      property    TokenText   : AnsiString   read  GetTokenText   write SetTokenText;
      property    TokenLine   : integer      read  GetTokenLine   write SetTokenLine;
      property    TokenColumn : integer      read  GetTokenColumn write SetTokenColumn;
   end;

   // ===================================================================================
   // ITokenStream interface
   // ===================================================================================
   ITokenStream = interface
      ['{48293450-4B0C-455B-BC3C-313363C503D2}']

      function    NextToken: IToken;
   end;

   // ===================================================================================
   // IInputBuffer interface
   // ===================================================================================
   IInputBuffer = interface
      ['{936C26A0-E25F-4B4E-9FD3-5E8E7FC23B17}']

      function    GetMarked: boolean;

      procedure   Consume;
      procedure   Commit;

      function    Mark: integer;
      procedure   Rewind( Value: integer);

      property    Marked: boolean read GetMarked;
   end;

   // ===================================================================================
   // ICharBuffer interface
   // ===================================================================================
   ICharBuffer = interface( IInputBuffer)
      ['{AA5CD21F-7982-4FF4-BB52-7A02B65C35A8}']

      function    LA(i: integer): AnsiChar;
   end;

   // ===================================================================================
   // ITokenBuffer interface
   // ===================================================================================
   ITokenBuffer = interface( IInputBuffer)
      ['{1FD2EB56-5385-49B0-815D-8B7F96E33F1A}']

      function    LA(i: integer): integer;
      function    LT(i: integer): IToken;
   end;

   // ===================================================================================
   // ILexerState
   // ===================================================================================
   ILexerState = interface
      ['{D6E15235-CADC-48BA-9390-376284515FAA}']

      function    GetFileName          : string;
      function    GetLine              : integer;
      function    GetColumn            : integer;
      function    GetGuessing          : integer;

      function    GetInputBuffer       : ICharBuffer;

      function    GetTokenStartLine    : integer;
      function    GetTokenStartColumn  : integer;

      procedure   SetFileName(         Value: string);
      procedure   SetLine(             Value: integer);
      procedure   SetColumn(           Value: integer);
      procedure   SetGuessing(         Value: integer);

      procedure   SetTokenStartLine(   Value: integer);
      procedure   SetTokenStartColumn( Value: integer);

      property    FileName          : string       read  GetFileName
                                                   write SetFileName;

      property    Line              : integer      read  GetLine
                                                   write SetLine;

      property    Column            : integer      read  GetColumn
                                                   write SetColumn;

      property    Guessing          : integer      read  GetGuessing
                                                   write SetGuessing;

      property    TokenStartLine    : integer      read  GetTokenStartLine
                                                   write SetTokenStartLine;

      property    TokenStartColumn  : integer      read  GetTokenStartColumn
                                                   write SetTokenStartColumn;

      property    InputBuffer       : ICharBuffer  read  GetInputBuffer;
   end;

   // ===================================================================================
   // IParserState
   // ===================================================================================
   IParserState = interface
      ['{763A4DAD-91F5-4225-A68D-8FE4B1A29164}']

      function    GetFileName       : string;
      function    GetGuessing       : integer;
      function    GetInputBuffer    : ITokenBuffer;

      procedure   SetFileName(   Value: string);
      procedure   SetGuessing(   Value: integer);

      property    FileName    : string       read  GetFileName    write SetFileName;
      property    Guessing    : integer      read  GetGuessing    write SetGuessing;
      property    InputBuffer : ITokenBuffer read  GetInputBuffer;
   end;

   // ===================================================================================
   // ITreeParserState
   // ===================================================================================
   ITreeParserState = interface
      ['{439DCDAA-B1AB-482A-BAAE-843917F60E42}']

      function    GetGuessing: integer;
      procedure   SetGuessing( Value: integer);

      property    Guessing: integer read GetGuessing write SetGuessing;
   end;


implementation

end.