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