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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2001-2011 Hartmut Kaiser | |
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 | =============================================================================*/ | |
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8 | #ifndef BOOST_SPIRIT_QI_OPERATOR_KLEENE_HPP |
9 | #define BOOST_SPIRIT_QI_OPERATOR_KLEENE_HPP | |
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10 | |
11 | #if defined(_MSC_VER) | |
12 | #pragma once | |
13 | #endif | |
14 | ||
15 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
16 | #include <boost/spirit/home/qi/parser.hpp> | |
17 | #include <boost/spirit/home/support/container.hpp> | |
18 | #include <boost/spirit/home/qi/detail/attributes.hpp> | |
19 | #include <boost/spirit/home/qi/detail/fail_function.hpp> | |
20 | #include <boost/spirit/home/qi/detail/pass_container.hpp> | |
21 | #include <boost/spirit/home/support/has_semantic_action.hpp> | |
22 | #include <boost/spirit/home/support/handles_container.hpp> | |
23 | #include <boost/spirit/home/support/info.hpp> | |
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24 | #include <boost/proto/operators.hpp> |
25 | #include <boost/proto/tags.hpp> | |
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26 | |
27 | namespace boost { namespace spirit | |
28 | { | |
29 | /////////////////////////////////////////////////////////////////////////// | |
30 | // Enablers | |
31 | /////////////////////////////////////////////////////////////////////////// | |
32 | //[composite_parsers_kleene_enable_ | |
33 | template <> | |
34 | struct use_operator<qi::domain, proto::tag::dereference> // enables *p | |
35 | : mpl::true_ {}; | |
36 | //] | |
37 | }} | |
38 | ||
39 | namespace boost { namespace spirit { namespace qi | |
40 | { | |
41 | //[composite_parsers_kleene | |
42 | template <typename Subject> | |
43 | struct kleene : unary_parser<kleene<Subject> > | |
44 | { | |
45 | typedef Subject subject_type; | |
46 | ||
47 | template <typename Context, typename Iterator> | |
48 | struct attribute | |
49 | { | |
50 | // Build a std::vector from the subject's attribute. Note | |
51 | // that build_std_vector may return unused_type if the | |
52 | // subject's attribute is an unused_type. | |
53 | typedef typename | |
54 | traits::build_std_vector< | |
55 | typename traits:: | |
56 | attribute_of<Subject, Context, Iterator>::type | |
57 | >::type | |
58 | type; | |
59 | }; | |
60 | ||
61 | kleene(Subject const& subject_) | |
62 | : subject(subject_) {} | |
63 | ||
64 | template <typename F> | |
65 | bool parse_container(F f) const | |
66 | { | |
67 | while (!f (subject)) | |
68 | ; | |
69 | return true; | |
70 | } | |
71 | ||
72 | template <typename Iterator, typename Context | |
73 | , typename Skipper, typename Attribute> | |
74 | bool parse(Iterator& first, Iterator const& last | |
75 | , Context& context, Skipper const& skipper | |
76 | , Attribute& attr_) const | |
77 | { | |
78 | // ensure the attribute is actually a container type | |
79 | traits::make_container(attr_); | |
80 | ||
81 | typedef detail::fail_function<Iterator, Context, Skipper> | |
82 | fail_function; | |
83 | ||
84 | Iterator iter = first; | |
85 | fail_function f(iter, last, context, skipper); | |
86 | parse_container(detail::make_pass_container(f, attr_)); | |
87 | ||
88 | first = f.first; | |
89 | return true; | |
90 | } | |
91 | ||
92 | template <typename Context> | |
93 | info what(Context& context) const | |
94 | { | |
95 | return info("kleene", subject.what(context)); | |
96 | } | |
97 | ||
98 | Subject subject; | |
99 | }; | |
100 | //] | |
101 | ||
102 | /////////////////////////////////////////////////////////////////////////// | |
103 | // Parser generators: make_xxx function (objects) | |
104 | /////////////////////////////////////////////////////////////////////////// | |
105 | //[composite_parsers_kleene_generator | |
106 | template <typename Elements, typename Modifiers> | |
107 | struct make_composite<proto::tag::dereference, Elements, Modifiers> | |
108 | : make_unary_composite<Elements, kleene> | |
109 | {}; | |
110 | //] | |
111 | ||
112 | // /////////////////////////////////////////////////////////////////////////// | |
113 | // // Define what attributes are compatible with a kleene | |
114 | // template <typename Attribute, typename Subject, typename Context, typename Iterator> | |
115 | // struct is_attribute_compatible<Attribute, kleene<Subject>, Context, Iterator> | |
116 | // : traits::is_container_compatible<qi::domain, Attribute | |
117 | // , kleene<Subject>, Context, Iterator> | |
118 | // {}; | |
119 | }}} | |
120 | ||
121 | namespace boost { namespace spirit { namespace traits | |
122 | { | |
123 | /////////////////////////////////////////////////////////////////////////// | |
124 | template <typename Subject> | |
125 | struct has_semantic_action<qi::kleene<Subject> > | |
126 | : unary_has_semantic_action<Subject> {}; | |
127 | ||
128 | /////////////////////////////////////////////////////////////////////////// | |
129 | template <typename Subject, typename Attribute, typename Context | |
130 | , typename Iterator> | |
131 | struct handles_container<qi::kleene<Subject>, Attribute | |
132 | , Context, Iterator> | |
133 | : mpl::true_ {}; | |
134 | }}} | |
135 | ||
136 | #endif |