Tools/Source/TianoTools/Pccts/h/BufFileInput.h

   1 // FILE:        BufFileInput.h
   2 // AUTHOR:      Alexey Demakov (AVD) demakov@kazbek.ispras.ru
   3 // CREATION:    26-JAN-1998
   4 // DESCRIPTION: File Input Stream with lookahead for Scanner
   5 // Tested under Win32 with ANTLR 1.33 MR10 and MSVC 5.0
   6
   7 // Change History:
   8 //
   9 //   28-May-1998    Add virtual destructor to release buffer
  10 //                  Manfred Kogler (km@cast.uni-linz.ac.at)
  11 //                  (1.33MR14)
  12
  13 #ifndef BufFileInput_h
  14 #define BufFileInput_h
  15
  16 #include "pcctscfg.h"
  17
  18 #include "pccts_stdio.h"
  19
  20 PCCTS_NAMESPACE_STD
  21
  22 #include "DLexerBase.h"
  23
  24 class DllExportPCCTS BufFileInput : public DLGInputStream
  25 {
  26 public:
  27     // constructor
  28     // f - input stream
  29     // buf_size - size of buffer (maximal length for string in is_in)
  30
  31     BufFileInput(FILE *f, int buf_size = 8 );
  32
  33     virtual ~BufFileInput();
  34
  35     // gets next char from stream
  36
  37     virtual int nextChar( void );
  38
  39     // looks in stream and compares next l characters with s
  40     // returns the result of comparision
  41
  42     int lookahead( char* s );
  43
  44 private:
  45     FILE *input; // input stream;
  46     int* buf;    // buffer
  47     int  size;   // size of buffer
  48     int  start;  // position of the first symbol in buffer
  49     int  len;    // count of characters in buffers
  50 };
  51
  52 #endif
  53 // end of file BufFileInput.h