878ddf1f |
1 | \r |
2 | /************************************************************/\r |
3 | /* */\r |
4 | /* Predefined char stream: Input from (c++) stream. */\r |
5 | /* */\r |
6 | /* By Hubert Holin (Hubert.Holin@Bigfoot.com), 1998. */\r |
7 | /* */\r |
8 | /* This is completely free stuff, do whatever you want with */\r |
9 | /* it (but then, I will take no responsability for whatever */\r |
10 | /* may happen if you do either... caveat emptor!). */\r |
11 | /* */\r |
12 | /************************************************************/\r |
13 | \r |
14 | #ifndef _DLG_STREAM_INPUT_H\r |
15 | #define _DLG_STREAM_INPUT_H\r |
16 | \r |
17 | #include "pccts_istream.h"\r |
18 | \r |
19 | PCCTS_NAMESPACE_STD\r |
20 | \r |
21 | #ifndef DLGX_H\r |
22 | #include "DLexerBase.h"\r |
23 | #endif\r |
24 | \r |
25 | \r |
26 | // NOTES: The semantics of the copy constructor\r |
27 | // and the affectation operator may be unwaranted...\r |
28 | // and the stream may not be reset.\r |
29 | //\r |
30 | // It would have been so much nicer for nextChar()\r |
31 | // to throw (of for the DLGInputStream to change status)\r |
32 | // upon hiting EOF than to return an "int"...\r |
33 | \r |
34 | template <\r |
35 | class E,\r |
36 | class T = ::std::char_traits<E>\r |
37 | >\r |
38 | class DLG_stream_input : public DLGInputStream\r |
39 | {\r |
40 | public:\r |
41 | \r |
42 | DLG_stream_input(::std::basic_istream<E,T> * p_input_stream)\r |
43 | : input(p_input_stream)\r |
44 | {\r |
45 | // nothing to do!\r |
46 | };\r |
47 | \r |
48 | DLG_stream_input(const DLG_stream_input & a_recopier)\r |
49 | : input(a_recopier.input)\r |
50 | {\r |
51 | // nothing to do!\r |
52 | };\r |
53 | \r |
54 | virtual ~DLG_stream_input()\r |
55 | {\r |
56 | this->purge(); // bloody templarized lookup...\r |
57 | };\r |
58 | \r |
59 | DLG_stream_input operator = (const DLG_stream_input & a_affecter)\r |
60 | {\r |
61 | if (this != &a_affecter)\r |
62 | {\r |
63 | input = a_affecter.input;\r |
64 | }\r |
65 | \r |
66 | return(*this);\r |
67 | };\r |
68 | \r |
69 | virtual int nextChar()\r |
70 | {\r |
71 | E extracted_stuff;\r |
72 | \r |
73 | input->get(extracted_stuff);\r |
74 | \r |
75 | if (*input)\r |
76 | {\r |
77 | return(int(extracted_stuff));\r |
78 | }\r |
79 | else\r |
80 | {\r |
81 | return(EOF);\r |
82 | }\r |
83 | };\r |
84 | \r |
85 | protected:\r |
86 | \r |
87 | ::std::basic_istream<E,T> * input;\r |
88 | \r |
89 | private:\r |
90 | \r |
91 | void purge()\r |
92 | {\r |
93 | // nothing to do!\r |
94 | };\r |
95 | };\r |
96 | \r |
97 | #endif /* _DLG_STREAM_INPUT_H */\r |
98 | \r |