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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
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_NOT_PREDICATE_MARCH_23_2007_0618PM) | |
8 | #define SPIRIT_NOT_PREDICATE_MARCH_23_2007_0618PM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/qi/domain.hpp> | |
15 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
16 | #include <boost/spirit/home/qi/parser.hpp> | |
17 | #include <boost/spirit/home/qi/detail/attributes.hpp> | |
18 | #include <boost/spirit/home/support/has_semantic_action.hpp> | |
19 | #include <boost/spirit/home/support/handles_container.hpp> | |
20 | #include <boost/spirit/home/support/info.hpp> | |
21 | ||
22 | namespace boost { namespace spirit | |
23 | { | |
24 | /////////////////////////////////////////////////////////////////////////// | |
25 | // Enablers | |
26 | /////////////////////////////////////////////////////////////////////////// | |
27 | template <> | |
28 | struct use_operator<qi::domain, proto::tag::logical_not> // enables !p | |
29 | : mpl::true_ {}; | |
30 | }} | |
31 | ||
32 | namespace boost { namespace spirit { namespace qi | |
33 | { | |
34 | template <typename Subject> | |
35 | struct not_predicate : unary_parser<not_predicate<Subject> > | |
36 | { | |
37 | typedef Subject subject_type; | |
38 | ||
39 | template <typename Context, typename Iterator> | |
40 | struct attribute | |
41 | { | |
42 | typedef unused_type type; | |
43 | }; | |
44 | ||
45 | not_predicate(Subject const& subject_) | |
46 | : subject(subject_) {} | |
47 | ||
48 | template <typename Iterator, typename Context | |
49 | , typename Skipper, typename Attribute> | |
50 | bool parse(Iterator& first, Iterator const& last | |
51 | , Context& context, Skipper const& skipper | |
52 | , Attribute& /*attr*/) const | |
53 | { | |
54 | Iterator i = first; | |
55 | return !subject.parse(i, last, context, skipper, unused); | |
56 | } | |
57 | ||
58 | template <typename Context> | |
59 | info what(Context& context) const | |
60 | { | |
61 | return info("not-predicate", subject.what(context)); | |
62 | } | |
63 | ||
64 | Subject subject; | |
65 | }; | |
66 | ||
67 | /////////////////////////////////////////////////////////////////////////// | |
68 | // Parser generators: make_xxx function (objects) | |
69 | /////////////////////////////////////////////////////////////////////////// | |
70 | template <typename Elements, typename Modifiers> | |
71 | struct make_composite<proto::tag::logical_not, Elements, Modifiers> | |
72 | : make_unary_composite<Elements, not_predicate> | |
73 | {}; | |
74 | }}} | |
75 | ||
76 | namespace boost { namespace spirit { namespace traits | |
77 | { | |
78 | /////////////////////////////////////////////////////////////////////////// | |
79 | template <typename Subject> | |
80 | struct has_semantic_action<qi::not_predicate<Subject> > | |
81 | : unary_has_semantic_action<Subject> {}; | |
82 | ||
83 | /////////////////////////////////////////////////////////////////////////// | |
84 | template <typename Subject, typename Attribute, typename Context | |
85 | , typename Iterator> | |
86 | struct handles_container<qi::not_predicate<Subject>, Attribute | |
87 | , Context, Iterator> | |
88 | : unary_handles_container<Subject, Attribute, Context, Iterator> {}; | |
89 | }}} | |
90 | ||
91 | #endif |