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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Hartmut Kaiser | |
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(SPIRIT_MATCHES_JAN_07_2010_0745PM) | |
8 | #define SPIRIT_MATCHES_JAN_07_2010_0745PM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
15 | #include <boost/spirit/home/qi/parser.hpp> | |
16 | #include <boost/spirit/home/qi/detail/assign_to.hpp> | |
17 | #include <boost/spirit/home/support/unused.hpp> | |
18 | #include <boost/spirit/home/support/info.hpp> | |
19 | #include <boost/spirit/home/support/common_terminals.hpp> | |
20 | #include <boost/spirit/home/support/has_semantic_action.hpp> | |
21 | #include <boost/spirit/home/support/handles_container.hpp> | |
22 | ||
23 | namespace boost { namespace spirit | |
24 | { | |
25 | /////////////////////////////////////////////////////////////////////////// | |
26 | // Enablers | |
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | template <> | |
29 | struct use_directive<qi::domain, tag::matches> // enables matches | |
30 | : mpl::true_ {}; | |
31 | }} | |
32 | ||
33 | namespace boost { namespace spirit { namespace qi | |
34 | { | |
35 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
36 | using spirit::matches; | |
37 | #endif | |
38 | using spirit::matches_type; | |
39 | ||
40 | /////////////////////////////////////////////////////////////////////////// | |
41 | // matches_directive returns whether the embedded parser matched | |
42 | /////////////////////////////////////////////////////////////////////////// | |
43 | template <typename Subject> | |
44 | struct matches_directive : unary_parser<matches_directive<Subject> > | |
45 | { | |
46 | typedef Subject subject_type; | |
47 | matches_directive(Subject const& subject_) | |
48 | : subject(subject_) {} | |
49 | ||
50 | template <typename Context, typename Iterator> | |
51 | struct attribute | |
52 | { | |
53 | typedef bool type; | |
54 | }; | |
55 | ||
56 | template <typename Iterator, typename Context | |
57 | , typename Skipper, typename Attribute> | |
58 | bool parse(Iterator& first, Iterator const& last | |
59 | , Context& context, Skipper const& skipper, Attribute& attr_) const | |
60 | { | |
61 | bool result = subject.parse(first, last, context, skipper, unused); | |
62 | spirit::traits::assign_to(result, attr_); | |
63 | return true; | |
64 | } | |
65 | ||
66 | template <typename Context> | |
67 | info what(Context& context) const | |
68 | { | |
69 | return info("matches", subject.what(context)); | |
70 | } | |
71 | ||
72 | Subject subject; | |
73 | ||
74 | private: | |
75 | // silence MSVC warning C4512: assignment operator could not be generated | |
76 | matches_directive& operator= (matches_directive const&); | |
77 | }; | |
78 | ||
79 | /////////////////////////////////////////////////////////////////////////// | |
80 | // Parser generators: make_xxx function (objects) | |
81 | /////////////////////////////////////////////////////////////////////////// | |
82 | template <typename Subject, typename Modifiers> | |
83 | struct make_directive<tag::matches, Subject, Modifiers> | |
84 | { | |
85 | typedef matches_directive<Subject> result_type; | |
86 | result_type operator()(unused_type, Subject const& subject, unused_type) const | |
87 | { | |
88 | return result_type(subject); | |
89 | } | |
90 | }; | |
91 | }}} | |
92 | ||
93 | namespace boost { namespace spirit { namespace traits | |
94 | { | |
95 | /////////////////////////////////////////////////////////////////////////// | |
96 | template <typename Subject> | |
97 | struct has_semantic_action<qi::matches_directive<Subject> > | |
98 | : unary_has_semantic_action<Subject> {}; | |
99 | ||
100 | /////////////////////////////////////////////////////////////////////////// | |
101 | template <typename Subject, typename Attribute, typename Context | |
102 | , typename Iterator> | |
103 | struct handles_container<qi::matches_directive<Subject>, Attribute | |
104 | , Context, Iterator> | |
105 | : unary_handles_container<Subject, Attribute, Context, Iterator> {}; | |
106 | }}} | |
107 | ||
108 | #endif |