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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // as_inverse.hpp | |
3 | // | |
4 | // Copyright 2008 Eric Niebler. Distributed under the Boost | |
5 | // Software License, Version 1.0. (See accompanying file | |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007 | |
9 | #define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007 | |
10 | ||
11 | // MS compatible compilers support #pragma once | |
12 | #if defined(_MSC_VER) | |
13 | # pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/mpl/sizeof.hpp> | |
17 | #include <boost/mpl/not.hpp> | |
18 | #include <boost/xpressive/detail/detail_fwd.hpp> | |
19 | #include <boost/xpressive/detail/static/static.hpp> | |
20 | #include <boost/proto/core.hpp> | |
21 | ||
22 | #define UNCV(x) typename remove_const<x>::type | |
23 | #define UNREF(x) typename remove_reference<x>::type | |
24 | #define UNCVREF(x) UNCV(UNREF(x)) | |
25 | ||
26 | namespace boost { namespace xpressive { namespace grammar_detail | |
27 | { | |
28 | ||
29 | template<typename T> | |
30 | struct inverter | |
31 | { | |
32 | typedef T type; | |
33 | static T call(T t) | |
34 | { | |
35 | t.inverse(); | |
36 | return t; | |
37 | } | |
38 | }; | |
39 | ||
40 | template<typename Traits, typename ICase, typename Not> | |
41 | struct inverter<detail::literal_matcher<Traits, ICase, Not> > | |
42 | { | |
43 | typedef detail::literal_matcher<Traits, ICase, typename mpl::not_<Not>::type> type; | |
44 | static type call(detail::literal_matcher<Traits, ICase, Not> t) | |
45 | { | |
46 | return type(t.ch_); | |
47 | } | |
48 | }; | |
49 | ||
50 | template<typename Traits> | |
51 | struct inverter<detail::logical_newline_matcher<Traits> > | |
52 | { | |
53 | // ~_ln matches any one character that is not in the "newline" character class | |
54 | typedef detail::posix_charset_matcher<Traits> type; | |
55 | static type call(detail::logical_newline_matcher<Traits> t) | |
56 | { | |
57 | return type(t.newline(), true); | |
58 | } | |
59 | }; | |
60 | ||
61 | template<typename Traits> | |
62 | struct inverter<detail::assert_word_matcher<detail::word_boundary<mpl::true_>, Traits> > | |
63 | { | |
64 | typedef detail::assert_word_matcher<detail::word_boundary<mpl::false_>, Traits> type; | |
65 | static type call(detail::assert_word_matcher<detail::word_boundary<mpl::true_>, Traits> t) | |
66 | { | |
67 | return type(t.word()); | |
68 | } | |
69 | }; | |
70 | ||
71 | struct as_inverse : proto::callable | |
72 | { | |
73 | template<typename Sig> | |
74 | struct result; | |
75 | ||
76 | template<typename This, typename Matcher> | |
77 | struct result<This(Matcher)> | |
78 | : inverter<UNCVREF(Matcher)> | |
79 | {}; | |
80 | ||
81 | template<typename Matcher> | |
82 | typename inverter<Matcher>::type operator ()(Matcher const &matcher) const | |
83 | { | |
84 | return inverter<Matcher>::call(matcher); | |
85 | } | |
86 | }; | |
87 | ||
88 | }}} | |
89 | ||
90 | #undef UNCV | |
91 | #undef UNREF | |
92 | #undef UNCVREF | |
93 | ||
94 | #endif |