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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // traits_utils.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_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005 | |
9 | #define BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005 | |
10 | ||
11 | // MS compatible compilers support #pragma once | |
12 | #if defined(_MSC_VER) | |
13 | # pragma once | |
14 | # pragma warning(push) | |
15 | # pragma warning(disable : 4100) // unreferenced formal parameter | |
16 | #endif | |
17 | ||
18 | #include <string> | |
19 | #include <boost/mpl/bool.hpp> | |
20 | #include <boost/mpl/assert.hpp> | |
21 | #include <boost/utility/enable_if.hpp> | |
22 | #include <boost/type_traits/is_same.hpp> | |
23 | #include <boost/iterator/transform_iterator.hpp> | |
24 | #include <boost/xpressive/detail/utility/algorithm.hpp> | |
25 | ||
26 | namespace boost { namespace xpressive { namespace detail | |
27 | { | |
28 | ||
29 | /////////////////////////////////////////////////////////////////////////////// | |
30 | // char_cast | |
31 | // | |
32 | template<typename ToChar, typename FromChar, typename Traits> | |
33 | inline ToChar | |
34 | char_cast(FromChar from, Traits const &, typename enable_if<is_same<ToChar, FromChar> >::type * = 0) | |
35 | { | |
36 | return from; | |
37 | } | |
38 | ||
39 | template<typename ToChar, typename FromChar, typename Traits> | |
40 | inline ToChar | |
41 | char_cast(FromChar from, Traits const &tr, typename disable_if<is_same<ToChar, FromChar> >::type * = 0) | |
42 | { | |
43 | BOOST_MPL_ASSERT((is_same<FromChar, char>)); | |
44 | return tr.widen(from); | |
45 | } | |
46 | ||
47 | /////////////////////////////////////////////////////////////////////////////// | |
48 | // widen_fun | |
49 | // | |
50 | template<typename Traits> | |
51 | struct widen_fun | |
52 | { | |
53 | typedef typename Traits::char_type result_type; | |
54 | explicit widen_fun(Traits const &tr) | |
55 | : traits_(tr) | |
56 | {} | |
57 | ||
58 | result_type operator()(char ch) const | |
59 | { | |
60 | return this->traits_.widen(ch); | |
61 | } | |
62 | ||
63 | Traits const &traits_; | |
64 | }; | |
65 | ||
66 | /////////////////////////////////////////////////////////////////////////////// | |
67 | // string_cast_ | |
68 | // | |
69 | template< | |
70 | typename To | |
71 | , typename From | |
72 | , typename ToChar = typename detail::range_data<To>::type | |
73 | , typename FromChar = typename detail::range_data<From>::type | |
74 | > | |
75 | struct string_cast_ | |
76 | { | |
77 | BOOST_MPL_ASSERT((is_same<FromChar, char>)); | |
78 | typedef To const result_type; | |
79 | template<typename Traits> | |
80 | result_type operator()(From const &from, Traits const &tr) const | |
81 | { | |
82 | widen_fun<Traits> widen(tr); | |
83 | To to( | |
84 | boost::make_transform_iterator(detail::data_begin(from), widen) | |
85 | , boost::make_transform_iterator(detail::data_end(from), widen) | |
86 | ); | |
87 | return to; | |
88 | } | |
89 | }; | |
90 | ||
91 | template<typename To, typename From, typename Char> | |
92 | struct string_cast_<To, From, Char, Char> | |
93 | { | |
94 | typedef To const result_type; | |
95 | template<typename Traits> | |
96 | result_type operator()(From const &from, Traits const &) const | |
97 | { | |
98 | To to(detail::data_begin(from), detail::data_end(from)); | |
99 | return to; | |
100 | } | |
101 | }; | |
102 | ||
103 | template<typename From, typename Char> | |
104 | struct string_cast_<From, From, Char, Char> | |
105 | { | |
106 | typedef From const &result_type; | |
107 | template<typename Traits> | |
108 | result_type operator()(From const &from, Traits const &) const | |
109 | { | |
110 | return from; | |
111 | } | |
112 | }; | |
113 | ||
114 | /////////////////////////////////////////////////////////////////////////////// | |
115 | // string_cast | |
116 | // | |
117 | template<typename To, typename From, typename Traits> | |
118 | typename string_cast_<To, From>::result_type | |
119 | string_cast(From const &from, Traits const &tr) | |
120 | { | |
121 | return string_cast_<To, From>()(from, tr); | |
122 | } | |
123 | ||
124 | /////////////////////////////////////////////////////////////////////////////// | |
125 | // translate | |
126 | // | |
127 | template<typename Char, typename Traits> | |
128 | inline Char translate(Char ch, Traits const &tr, mpl::false_) // case-sensitive | |
129 | { | |
130 | return tr.translate(ch); | |
131 | } | |
132 | ||
133 | template<typename Char, typename Traits> | |
134 | inline Char translate(Char ch, Traits const &tr, mpl::true_) // case-insensitive | |
135 | { | |
136 | return tr.translate_nocase(ch); | |
137 | } | |
138 | ||
139 | }}} // namespace boost::xpressive::detail | |
140 | ||
141 | #if defined(_MSC_VER) | |
142 | # pragma warning(pop) | |
143 | #endif | |
144 | ||
145 | #endif |