1/*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
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_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM)
8#define BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM
9
10#include <boost/spirit/home/x3/support/unused.hpp>
11#include <boost/spirit/home/x3/support/context.hpp>
12#include <boost/spirit/home/x3/char/char_class_tags.hpp>
13
14namespace boost { namespace spirit { namespace x3
15{
16 struct no_case_tag {};
17
18 template <typename Encoding>
19 struct case_compare
20 {
21 template <typename Char, typename CharSet>
22 bool in_set(Char ch, CharSet const& set)
23 {
24 return set.test(ch);
25 }
26
27 template <typename Char>
28 int32_t operator()(Char lc, Char rc) const
29 {
30 return lc - rc;
31 }
32
33 template <typename CharClassTag>
34 CharClassTag get_char_class_tag(CharClassTag tag) const
35 {
36 return tag;
37 }
38 };
39
40 template <typename Encoding>
41 struct no_case_compare
42 {
43 template <typename Char, typename CharSet>
44 bool in_set(Char ch_, CharSet const& set)
45 {
46 using char_type = typename Encoding::classify_type;
47 auto ch = char_type(ch_);
48 return set.test(ch)
49 || set.test(Encoding::islower(ch)
50 ? Encoding::toupper(ch) : Encoding::tolower(ch));
51 }
52
53 template <typename Char>
54 int32_t operator()(Char lc_, Char const rc_) const
55 {
56 using char_type = typename Encoding::classify_type;
57 auto lc = char_type(lc_);
58 auto rc = char_type(rc_);
59 return Encoding::islower(rc)
60 ? Encoding::tolower(lc) - rc : Encoding::toupper(lc) - rc;
61 }
62
63 template <typename CharClassTag>
64 CharClassTag get_char_class_tag(CharClassTag tag) const
65 {
66 return tag;
67 }
68
69 alpha_tag get_char_class_tag(lower_tag ) const
70 {
71 return {};
72 }
73
74 alpha_tag get_char_class_tag(upper_tag ) const
75 {
76 return {};
77 }
78
79 };
80
81 template <typename Encoding>
82 case_compare<Encoding> get_case_compare_impl(unused_type const&)
83 {
84 return {};
85 }
86
87 template <typename Encoding>
88 no_case_compare<Encoding> get_case_compare_impl(no_case_tag const&)
89 {
90 return {};
91 }
92
93 template <typename Encoding, typename Context>
94 inline decltype(auto) get_case_compare(Context const& context)
95 {
96 return get_case_compare_impl<Encoding>(x3::get<no_case_tag>(context));
97 }
98
99 auto const no_case_compare_ = no_case_tag{};
100
101}}}
102
103#endif
104

source code of boost/libs/spirit/include/boost/spirit/home/x3/support/no_case.hpp