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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 |