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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Hartmut Kaiser | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_STREAM_MAY_05_2007_1228PM) | |
8 | #define BOOST_SPIRIT_STREAM_MAY_05_2007_1228PM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/qi/detail/string_parse.hpp> | |
15 | #include <boost/spirit/home/qi/stream/detail/match_manip.hpp> | |
16 | #include <boost/spirit/home/qi/stream/detail/iterator_source.hpp> | |
17 | #include <boost/spirit/home/support/detail/hold_any.hpp> | |
18 | ||
19 | #include <iosfwd> | |
20 | #include <sstream> | |
21 | ||
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | namespace boost { namespace spirit | |
24 | { | |
25 | /////////////////////////////////////////////////////////////////////////// | |
26 | // Enablers | |
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | template <> | |
29 | struct use_terminal<qi::domain, tag::stream> // enables stream | |
30 | : mpl::true_ {}; | |
31 | ||
32 | template <> | |
33 | struct use_terminal<qi::domain, tag::wstream> // enables wstream | |
34 | : mpl::true_ {}; | |
35 | }} | |
36 | ||
37 | /////////////////////////////////////////////////////////////////////////////// | |
38 | namespace boost { namespace spirit { namespace qi | |
39 | { | |
40 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
41 | using spirit::stream; | |
42 | using spirit::wstream; | |
43 | #endif | |
44 | using spirit::stream_type; | |
45 | using spirit::wstream_type; | |
46 | ||
47 | template <typename Char = char, typename T = spirit::basic_hold_any<char> > | |
48 | struct stream_parser | |
49 | : primitive_parser<stream_parser<Char, T> > | |
50 | { | |
51 | template <typename Context, typename Iterator> | |
52 | struct attribute | |
53 | { | |
54 | typedef T type; | |
55 | }; | |
56 | ||
57 | template <typename Iterator, typename Context | |
58 | , typename Skipper, typename Attribute> | |
59 | bool parse(Iterator& first, Iterator const& last | |
60 | , Context& /*context*/, Skipper const& skipper | |
61 | , Attribute& attr_) const | |
62 | { | |
63 | typedef qi::detail::iterator_source<Iterator> source_device; | |
64 | typedef boost::iostreams::stream<source_device> instream; | |
65 | ||
66 | qi::skip_over(first, last, skipper); | |
67 | ||
68 | instream in(first, last); // copies 'first' | |
69 | in >> attr_; // use existing operator>>() | |
70 | ||
71 | // advance the iterator if everything is ok | |
72 | if (in) { | |
73 | if (!in.eof()) { | |
74 | std::streamsize pos = in.tellg(); | |
75 | std::advance(first, pos); | |
76 | } else { | |
77 | first = last; | |
78 | } | |
79 | return true; | |
80 | } | |
81 | ||
82 | return false; | |
83 | } | |
84 | ||
85 | template <typename Context> | |
86 | info what(Context& /*context*/) const | |
87 | { | |
88 | return info("stream"); | |
89 | } | |
90 | }; | |
91 | ||
92 | template <typename T, typename Char = char> | |
93 | struct typed_stream | |
94 | : proto::terminal<stream_parser<Char, T> >::type | |
95 | { | |
96 | }; | |
97 | ||
98 | /////////////////////////////////////////////////////////////////////////// | |
99 | // Parser generators: make_xxx function (objects) | |
100 | /////////////////////////////////////////////////////////////////////////// | |
101 | template <typename Char> | |
102 | struct make_stream | |
103 | { | |
104 | typedef stream_parser<Char> result_type; | |
105 | result_type operator()(unused_type, unused_type) const | |
106 | { | |
107 | return result_type(); | |
108 | } | |
109 | }; | |
110 | ||
111 | template <typename Modifiers> | |
112 | struct make_primitive<tag::stream, Modifiers> : make_stream<char> {}; | |
113 | ||
114 | template <typename Modifiers> | |
115 | struct make_primitive<tag::wstream, Modifiers> : make_stream<wchar_t> {}; | |
116 | }}} | |
117 | ||
118 | #endif |