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54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
// FILE: BufFileInput.h
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// AUTHOR: Alexey Demakov (AVD) demakov@kazbek.ispras.ru
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// CREATION: 26-JAN-1998
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// DESCRIPTION: File Input Stream with lookahead for Scanner
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// Tested under Win32 with ANTLR 1.33 MR10 and MSVC 5.0
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// Change History:
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//
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// 28-May-1998 Add virtual destructor to release buffer
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// Manfred Kogler (km@cast.uni-linz.ac.at)
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// (1.33MR14)
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#ifndef BufFileInput_h
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#define BufFileInput_h
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#include "pcctscfg.h"
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#include "pccts_stdio.h"
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PCCTS_NAMESPACE_STD
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#include "DLexerBase.h"
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class DllExportPCCTS BufFileInput : public DLGInputStream
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{
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public:
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// constructor
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// f - input stream
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// buf_size - size of buffer (maximal length for string in is_in)
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BufFileInput(FILE *f, int buf_size = 8 );
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virtual ~BufFileInput();
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// gets next char from stream
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virtual int nextChar( void );
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// looks in stream and compares next l characters with s
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// returns the result of comparision
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int lookahead( char* s );
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private:
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FILE *input; // input stream;
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int* buf; // buffer
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int size; // size of buffer
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int start; // position of the first symbol in buffer
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int len; // count of characters in buffers
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};
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#endif
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// end of file BufFileInput.h
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