| 878ddf1f |
1 | // FILE: BufFileInput.cpp\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 | // See file BufFileInput.h for details\r |
| 6 | \r |
| 7 | // Change History:\r |
| 8 | //\r |
| 9 | // 22-Jun-1998 assert.h -> PCCTS_ASSERT_H\r |
| 10 | // string.h -> PCCTS_STRING_H\r |
| 11 | //\r |
| 12 | // 28-May-1998 Add virtual destructor to release buffer.\r |
| 13 | //\r |
| 14 | // Add dummy definition for ANTLRTokenType\r |
| 15 | // to allow compilation without knowing\r |
| 16 | // token type codes.\r |
| 17 | //\r |
| 18 | // Manfred Kogler (km@cast.uni-linz.ac.at)\r |
| 19 | // (1.33MR14)\r |
| 20 | //\r |
| 21 | // 20-Jul-1998 MR14a - Reorder initialization list for ctor.\r |
| 22 | //\r |
| 23 | \r |
| 24 | enum ANTLRTokenType {TER_HATES_CPP=0, SO_DO_OTHERS=9999 };\r |
| 25 | \r |
| 26 | #include "pcctscfg.h"\r |
| 27 | #include "pccts_assert.h"\r |
| 28 | #include "pccts_string.h"\r |
| 29 | \r |
| 30 | PCCTS_NAMESPACE_STD\r |
| 31 | \r |
| 32 | #include "BufFileInput.h"\r |
| 33 | \r |
| 34 | BufFileInput::BufFileInput( FILE *f, int buf_size )\r |
| 35 | : input( f ),\r |
| 36 | buf( new int[buf_size] ),\r |
| 37 | size( buf_size ),\r |
| 38 | start( 0 ),\r |
| 39 | len( 0 )\r |
| 40 | {\r |
| 41 | }\r |
| 42 | \r |
| 43 | BufFileInput::~BufFileInput()\r |
| 44 | {\r |
| 45 | delete [] buf;\r |
| 46 | }\r |
| 47 | \r |
| 48 | int BufFileInput::nextChar( void )\r |
| 49 | {\r |
| 50 | if( len > 0 )\r |
| 51 | {\r |
| 52 | // get char from buffer\r |
| 53 | int c = buf[start];\r |
| 54 | \r |
| 55 | if( c != EOF )\r |
| 56 | {\r |
| 57 | start++; start %= size;\r |
| 58 | len--;\r |
| 59 | }\r |
| 60 | return c;\r |
| 61 | } else {\r |
| 62 | // get char from file\r |
| 63 | int c = getc( input );\r |
| 64 | \r |
| 65 | if( c == EOF )\r |
| 66 | {\r |
| 67 | // if EOF - put it in the buffer as indicator\r |
| 68 | buf[start] = EOF;\r |
| 69 | len++;\r |
| 70 | }\r |
| 71 | return c;\r |
| 72 | }\r |
| 73 | }\r |
| 74 | \r |
| 75 | int BufFileInput::lookahead( char* s )\r |
| 76 | {\r |
| 77 | int l = strlen( s );\r |
| 78 | \r |
| 79 | assert( 0 < l && l <= size );\r |
| 80 | \r |
| 81 | while( len < l )\r |
| 82 | {\r |
| 83 | int c = getc( input );\r |
| 84 | \r |
| 85 | buf[ (start+len) % size ] = c;\r |
| 86 | \r |
| 87 | len++;\r |
| 88 | \r |
| 89 | if( c == EOF ) return 0;\r |
| 90 | }\r |
| 91 | \r |
| 92 | for( int i = 0; i < l; i++ )\r |
| 93 | {\r |
| 94 | if( s[i] != buf[ (start+i) % size ] ) return 0;\r |
| 95 | }\r |
| 96 | return 1;\r |
| 97 | }\r |
| 98 | \r |
| 99 | // End of file BufFileInput.cpp\r |
| 100 | \r |
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