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1 | /*============================================================================= |
2 | Copyright (c) 2009 Hartmut Kaiser | |
3 | Copyright (c) 2014 Joel de Guzman | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ==============================================================================*/ | |
8 | #if !defined(SPIRIT_X3_BOOL_SEP_29_2009_0709AM) | |
9 | #define SPIRIT_X3_BOOL_SEP_29_2009_0709AM | |
10 | ||
11 | #include <boost/spirit/home/x3/core/parser.hpp> | |
12 | #include <boost/spirit/home/x3/core/skip_over.hpp> | |
13 | #include <boost/spirit/home/x3/numeric/bool_policies.hpp> | |
14 | ||
15 | namespace boost { namespace spirit { namespace x3 | |
16 | { | |
17 | template <typename T, typename Encoding, typename BoolPolicies = bool_policies<T>> | |
18 | struct bool_parser : parser<bool_parser<T, Encoding, BoolPolicies>> | |
19 | { | |
20 | typedef Encoding encoding; | |
21 | typedef T attribute_type; | |
22 | static bool const has_attribute = true; | |
23 | ||
24 | bool_parser() | |
25 | : policies() {} | |
26 | ||
27 | bool_parser(BoolPolicies const& policies) | |
28 | : policies(policies) {} | |
29 | ||
30 | template <typename Iterator, typename Context> | |
31 | bool parse(Iterator& first, Iterator const& last | |
32 | , Context const& context, unused_type, T& attr) const | |
33 | { | |
34 | x3::skip_over(first, last, context); | |
35 | return policies.parse_true(first, last, attr, get_case_compare<encoding>(context)) | |
36 | || policies.parse_false(first, last, attr, get_case_compare<encoding>(context)); | |
37 | } | |
38 | ||
39 | template <typename Iterator, typename Context, typename Attribute> | |
40 | bool parse(Iterator& first, Iterator const& last | |
41 | , Context const& context, unused_type, Attribute& attr_param) const | |
42 | { | |
43 | // this case is called when Attribute is not T | |
44 | T attr_; | |
45 | if (parse(first, last, context, unused, attr_)) | |
46 | { | |
47 | traits::move_to(attr_, attr_param); | |
48 | return true; | |
49 | } | |
50 | return false; | |
51 | } | |
52 | ||
53 | BoolPolicies policies; | |
54 | }; | |
55 | ||
56 | template <typename T, typename Encoding, typename BoolPolicies = bool_policies<T>> | |
57 | struct literal_bool_parser : parser<bool_parser<T, Encoding, BoolPolicies>> | |
58 | { | |
59 | typedef Encoding encoding; | |
60 | typedef T attribute_type; | |
61 | static bool const has_attribute = true; | |
62 | ||
63 | template <typename Value> | |
64 | literal_bool_parser(Value const& n) | |
65 | : policies(), n_(n) {} | |
66 | ||
67 | template <typename Value> | |
68 | literal_bool_parser(Value const& n, BoolPolicies const& policies) | |
69 | : policies(policies), n_(n) {} | |
70 | ||
71 | template <typename Iterator, typename Context> | |
72 | bool parse_main(Iterator& first, Iterator const& last | |
73 | , Context& context, T& attr) const | |
74 | { | |
75 | x3::skip_over(first, last, context); | |
76 | return (n_ && policies.parse_true(first, last, attr, get_case_compare<encoding>(context))) | |
77 | || (!n_ && policies.parse_false(first, last, attr, get_case_compare<encoding>(context))); | |
78 | } | |
79 | ||
80 | template <typename Iterator, typename Context> | |
81 | bool parse(Iterator& first, Iterator const& last | |
82 | , Context& context, unused_type, T& attr) const | |
83 | { | |
84 | return parse_main(first, last, context, attr); | |
85 | } | |
86 | ||
87 | template <typename Iterator, typename Context, typename Attribute> | |
88 | bool parse(Iterator& first, Iterator const& last | |
89 | , Context const& context, unused_type, Attribute& attr_param) const | |
90 | { | |
91 | // this case is called when Attribute is not T | |
92 | T attr_; | |
93 | if (parse_main(first, last, context, attr_)) | |
94 | { | |
95 | traits::move_to(attr_, attr_param); | |
96 | return true; | |
97 | } | |
98 | return false; | |
99 | } | |
100 | ||
101 | BoolPolicies policies; | |
102 | T n_; | |
103 | }; | |
104 | ||
105 | namespace standard | |
106 | { | |
107 | typedef bool_parser<bool, char_encoding::standard> bool_type; | |
108 | bool_type const bool_ = {}; | |
109 | ||
110 | typedef literal_bool_parser<bool, char_encoding::standard> true_type; | |
111 | true_type const true_ = { true }; | |
112 | ||
113 | typedef literal_bool_parser<bool, char_encoding::standard> false_type; | |
114 | false_type const false_ = { false }; | |
115 | } | |
116 | ||
117 | namespace standard_wide | |
118 | { | |
119 | typedef bool_parser<bool, char_encoding::standard_wide> bool_type; | |
120 | bool_type const bool_ = {}; | |
121 | ||
122 | typedef literal_bool_parser<bool, char_encoding::standard_wide> true_type; | |
123 | true_type const true_ = { true }; | |
124 | ||
125 | typedef literal_bool_parser<bool, char_encoding::standard_wide> false_type; | |
126 | false_type const false_ = { false }; | |
127 | } | |
128 | ||
129 | namespace ascii | |
130 | { | |
131 | typedef bool_parser<bool, char_encoding::ascii> bool_type; | |
132 | bool_type const bool_ = {}; | |
133 | ||
134 | typedef literal_bool_parser<bool, char_encoding::ascii> true_type; | |
135 | true_type const true_ = { true }; | |
136 | ||
137 | typedef literal_bool_parser<bool, char_encoding::ascii> false_type; | |
138 | false_type const false_ = { false }; | |
139 | } | |
140 | ||
141 | namespace iso8859_1 | |
142 | { | |
143 | typedef bool_parser<bool, char_encoding::iso8859_1> bool_type; | |
144 | bool_type const bool_ = {}; | |
145 | ||
146 | typedef literal_bool_parser<bool, char_encoding::iso8859_1> true_type; | |
147 | true_type const true_ = { true }; | |
148 | ||
149 | typedef literal_bool_parser<bool, char_encoding::iso8859_1> false_type; | |
150 | false_type const false_ = { false }; | |
151 | } | |
152 | ||
153 | using standard::bool_; | |
154 | using standard::true_; | |
155 | using standard::false_; | |
156 | ||
157 | }}} | |
158 | ||
159 | #endif |