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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2001-2011 Hartmut Kaiser | |
4 | Copyright (c) 2010 Bryce Lelbach | |
5 | ||
6 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
7 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
8 | =============================================================================*/ | |
9 | #if !defined(SPIRIT_AS_DECEMBER_6_2010_1013AM) | |
10 | #define SPIRIT_AS_DECEMBER_6_2010_1013AM | |
11 | ||
12 | #if defined(_MSC_VER) | |
13 | #pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
17 | #include <boost/spirit/home/qi/skip_over.hpp> | |
18 | #include <boost/spirit/home/qi/parser.hpp> | |
19 | #include <boost/spirit/home/qi/detail/assign_to.hpp> | |
20 | #include <boost/spirit/home/support/unused.hpp> | |
21 | #include <boost/spirit/home/support/info.hpp> | |
22 | #include <boost/spirit/home/support/common_terminals.hpp> | |
23 | #include <boost/spirit/home/support/unused.hpp> | |
24 | #include <boost/spirit/home/support/has_semantic_action.hpp> | |
25 | #include <boost/spirit/home/support/handles_container.hpp> | |
26 | #include <boost/spirit/home/support/assert_msg.hpp> | |
27 | #include <boost/spirit/home/support/container.hpp> | |
28 | #include <boost/range/iterator_range.hpp> | |
29 | #include <string> | |
30 | ||
31 | namespace boost { namespace spirit { namespace qi | |
32 | { | |
33 | template <typename T> | |
34 | struct as | |
35 | : stateful_tag_type<T, tag::as> | |
36 | { | |
37 | //~ BOOST_SPIRIT_ASSERT_MSG( | |
38 | //~ (traits::is_container<T>::type::value), | |
39 | //~ error_type_must_be_a_container, | |
40 | //~ (T)); | |
41 | }; | |
42 | }}} | |
43 | ||
44 | namespace boost { namespace spirit | |
45 | { | |
46 | /////////////////////////////////////////////////////////////////////////// | |
47 | // Enablers | |
48 | /////////////////////////////////////////////////////////////////////////// | |
49 | // enables as_string[...] | |
50 | template <> | |
51 | struct use_directive<qi::domain, tag::as_string> | |
52 | : mpl::true_ {}; | |
53 | ||
54 | // enables as_wstring[...] | |
55 | template <> | |
56 | struct use_directive<qi::domain, tag::as_wstring> | |
57 | : mpl::true_ {}; | |
58 | ||
59 | // enables as<T>[...] | |
60 | template <typename T> | |
61 | struct use_directive<qi::domain, tag::stateful_tag<T, tag::as> > | |
62 | : mpl::true_ | |
63 | {}; | |
64 | }} | |
65 | ||
66 | namespace boost { namespace spirit { namespace qi | |
67 | { | |
68 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
69 | using spirit::as_string; | |
70 | using spirit::as_wstring; | |
71 | #endif | |
72 | using spirit::as_string_type; | |
73 | using spirit::as_wstring_type; | |
74 | ||
75 | template <typename Subject, typename T> | |
76 | struct as_directive : unary_parser<as_directive<Subject, T> > | |
77 | { | |
78 | typedef Subject subject_type; | |
79 | as_directive(Subject const& subject_) | |
80 | : subject(subject_) {} | |
81 | ||
82 | template <typename Context, typename Iterator> | |
83 | struct attribute | |
84 | { | |
85 | typedef T type; | |
86 | }; | |
87 | ||
88 | template <typename Iterator, typename Context | |
89 | , typename Skipper, typename Attribute> | |
90 | bool parse(Iterator& first, Iterator const& last | |
91 | , Context& context, Skipper const& skipper, Attribute& attr_) const | |
92 | { | |
93 | Iterator i = first; | |
94 | T as_attr; | |
95 | if (subject.parse(i, last, context, skipper, as_attr)) | |
96 | { | |
97 | spirit::traits::assign_to(as_attr, attr_); | |
98 | first = i; | |
99 | return true; | |
100 | } | |
101 | return false; | |
102 | } | |
103 | ||
104 | template <typename Iterator, typename Context, typename Skipper> | |
105 | bool parse(Iterator& first, Iterator const& last | |
106 | , Context& context, Skipper const& skipper, T& attr_) const | |
107 | { | |
108 | Iterator i = first; | |
109 | if (subject.parse(i, last, context, skipper, attr_)) | |
110 | { | |
111 | first = i; | |
112 | return true; | |
113 | } | |
114 | return false; | |
115 | } | |
116 | ||
117 | template <typename Context> | |
118 | info what(Context& context) const | |
119 | { | |
120 | return info("as", subject.what(context)); | |
121 | } | |
122 | ||
123 | Subject subject; | |
124 | }; | |
125 | ||
126 | /////////////////////////////////////////////////////////////////////////// | |
127 | // Parser generators: make_xxx function (objects) | |
128 | /////////////////////////////////////////////////////////////////////////// | |
129 | template <typename Subject, typename Modifiers> | |
130 | struct make_directive<tag::as_string, Subject, Modifiers> | |
131 | { | |
132 | typedef as_directive<Subject, std::string> result_type; | |
133 | result_type operator()(unused_type, Subject const& subject | |
134 | , unused_type) const | |
135 | { | |
136 | return result_type(subject); | |
137 | } | |
138 | }; | |
139 | ||
140 | template <typename Subject, typename Modifiers> | |
141 | struct make_directive<tag::as_wstring, Subject, Modifiers> | |
142 | { | |
143 | typedef as_directive<Subject, std::basic_string<wchar_t> > result_type; | |
144 | result_type operator()(unused_type, Subject const& subject | |
145 | , unused_type) const | |
146 | { | |
147 | return result_type(subject); | |
148 | } | |
149 | }; | |
150 | ||
151 | template <typename T, typename Subject, typename Modifiers> | |
152 | struct make_directive<tag::stateful_tag<T, tag::as>, Subject, Modifiers> | |
153 | { | |
154 | typedef as_directive<Subject, T> result_type; | |
155 | result_type operator()(unused_type, Subject const& subject | |
156 | , unused_type) const | |
157 | { | |
158 | return result_type(subject); | |
159 | } | |
160 | }; | |
161 | }}} | |
162 | ||
163 | namespace boost { namespace spirit { namespace traits | |
164 | { | |
165 | /////////////////////////////////////////////////////////////////////////// | |
166 | template <typename Subject, typename T> | |
167 | struct has_semantic_action<qi::as_directive<Subject, T> > | |
168 | : unary_has_semantic_action<Subject> {}; | |
169 | ||
170 | /////////////////////////////////////////////////////////////////////////// | |
171 | template <typename Subject, typename T, typename Attribute | |
172 | , typename Context, typename Iterator> | |
173 | struct handles_container<qi::as_directive<Subject, T>, Attribute | |
174 | , Context, Iterator> | |
175 | : mpl::false_ {}; | |
176 | }}} | |
177 | ||
178 | #endif |