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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 | =============================================================================*/ | |
8 | #if !defined(SPIRIT_KLEENE_JANUARY_07_2007_0818AM) | |
9 | #define SPIRIT_KLEENE_JANUARY_07_2007_0818AM | |
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> | |
24 | ||
25 | namespace boost { namespace spirit | |
26 | { | |
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | // Enablers | |
29 | /////////////////////////////////////////////////////////////////////////// | |
30 | //[composite_parsers_kleene_enable_ | |
31 | template <> | |
32 | struct use_operator<qi::domain, proto::tag::dereference> // enables *p | |
33 | : mpl::true_ {}; | |
34 | //] | |
35 | }} | |
36 | ||
37 | namespace boost { namespace spirit { namespace qi | |
38 | { | |
39 | //[composite_parsers_kleene | |
40 | template <typename Subject> | |
41 | struct kleene : unary_parser<kleene<Subject> > | |
42 | { | |
43 | typedef Subject subject_type; | |
44 | ||
45 | template <typename Context, typename Iterator> | |
46 | struct attribute | |
47 | { | |
48 | // Build a std::vector from the subject's attribute. Note | |
49 | // that build_std_vector may return unused_type if the | |
50 | // subject's attribute is an unused_type. | |
51 | typedef typename | |
52 | traits::build_std_vector< | |
53 | typename traits:: | |
54 | attribute_of<Subject, Context, Iterator>::type | |
55 | >::type | |
56 | type; | |
57 | }; | |
58 | ||
59 | kleene(Subject const& subject_) | |
60 | : subject(subject_) {} | |
61 | ||
62 | template <typename F> | |
63 | bool parse_container(F f) const | |
64 | { | |
65 | while (!f (subject)) | |
66 | ; | |
67 | return true; | |
68 | } | |
69 | ||
70 | template <typename Iterator, typename Context | |
71 | , typename Skipper, typename Attribute> | |
72 | bool parse(Iterator& first, Iterator const& last | |
73 | , Context& context, Skipper const& skipper | |
74 | , Attribute& attr_) const | |
75 | { | |
76 | // ensure the attribute is actually a container type | |
77 | traits::make_container(attr_); | |
78 | ||
79 | typedef detail::fail_function<Iterator, Context, Skipper> | |
80 | fail_function; | |
81 | ||
82 | Iterator iter = first; | |
83 | fail_function f(iter, last, context, skipper); | |
84 | parse_container(detail::make_pass_container(f, attr_)); | |
85 | ||
86 | first = f.first; | |
87 | return true; | |
88 | } | |
89 | ||
90 | template <typename Context> | |
91 | info what(Context& context) const | |
92 | { | |
93 | return info("kleene", subject.what(context)); | |
94 | } | |
95 | ||
96 | Subject subject; | |
97 | }; | |
98 | //] | |
99 | ||
100 | /////////////////////////////////////////////////////////////////////////// | |
101 | // Parser generators: make_xxx function (objects) | |
102 | /////////////////////////////////////////////////////////////////////////// | |
103 | //[composite_parsers_kleene_generator | |
104 | template <typename Elements, typename Modifiers> | |
105 | struct make_composite<proto::tag::dereference, Elements, Modifiers> | |
106 | : make_unary_composite<Elements, kleene> | |
107 | {}; | |
108 | //] | |
109 | ||
110 | // /////////////////////////////////////////////////////////////////////////// | |
111 | // // Define what attributes are compatible with a kleene | |
112 | // template <typename Attribute, typename Subject, typename Context, typename Iterator> | |
113 | // struct is_attribute_compatible<Attribute, kleene<Subject>, Context, Iterator> | |
114 | // : traits::is_container_compatible<qi::domain, Attribute | |
115 | // , kleene<Subject>, Context, Iterator> | |
116 | // {}; | |
117 | }}} | |
118 | ||
119 | namespace boost { namespace spirit { namespace traits | |
120 | { | |
121 | /////////////////////////////////////////////////////////////////////////// | |
122 | template <typename Subject> | |
123 | struct has_semantic_action<qi::kleene<Subject> > | |
124 | : unary_has_semantic_action<Subject> {}; | |
125 | ||
126 | /////////////////////////////////////////////////////////////////////////// | |
127 | template <typename Subject, typename Attribute, typename Context | |
128 | , typename Iterator> | |
129 | struct handles_container<qi::kleene<Subject>, Attribute | |
130 | , Context, Iterator> | |
131 | : mpl::true_ {}; | |
132 | }}} | |
133 | ||
134 | #endif |