1 //  Copyright (c) 2001-2011 Hartmut Kaiser
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 #ifndef BOOST_SPIRIT_KARMA_OPERATOR_AND_PREDICATE_HPP
8 #define BOOST_SPIRIT_KARMA_OPERATOR_AND_PREDICATE_HPP
9 
10 #if defined(_MSC_VER)
11 #pragma once
12 #endif
13 
14 #include <boost/spirit/home/karma/domain.hpp>
15 #include <boost/spirit/home/karma/meta_compiler.hpp>
16 #include <boost/spirit/home/karma/generator.hpp>
17 #include <boost/spirit/home/karma/detail/output_iterator.hpp>
18 #include <boost/spirit/home/karma/detail/attributes.hpp>
19 #include <boost/spirit/home/support/info.hpp>
20 #include <boost/spirit/home/support/has_semantic_action.hpp>
21 #include <boost/spirit/home/support/handles_container.hpp>
22 #include <boost/proto/operators.hpp>
23 #include <boost/proto/tags.hpp>
24 
25 namespace boost { namespace spirit
26 {
27     ///////////////////////////////////////////////////////////////////////////
28     // Enablers
29     ///////////////////////////////////////////////////////////////////////////
30     template <>
31     struct use_operator<karma::domain, proto::tag::address_of> // enables &g
32       : mpl::true_ {};
33 }}
34 
35 namespace boost { namespace spirit { namespace karma
36 {
37     template <typename Subject>
38     struct and_predicate : unary_generator<and_predicate<Subject> >
39     {
40         typedef Subject subject_type;
41         typedef mpl::int_<
42             generator_properties::disabling | subject_type::properties::value
43         > properties;
44 
45         template <typename Context, typename Iterator>
46         struct attribute
47           : traits::attribute_of<subject_type, Context, Iterator>
48         {};
49 
and_predicateboost::spirit::karma::and_predicate50         and_predicate(Subject const& subject)
51           : subject(subject) {}
52 
53         template <
54             typename OutputIterator, typename Context, typename Delimiter
55           , typename Attribute>
generateboost::spirit::karma::and_predicate56         bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
57           , Attribute const& attr) const
58         {
59             // inhibits output
60             detail::disable_output<OutputIterator> disable(sink);
61             return subject.generate(sink, ctx, d, attr);
62         }
63 
64         template <typename Context>
whatboost::spirit::karma::and_predicate65         info what(Context& context) const
66         {
67             return info("and-predicate", subject.what(context));
68         }
69 
70         Subject subject;
71     };
72 
73     ///////////////////////////////////////////////////////////////////////////
74     // Generator generators: make_xxx function (objects)
75     ///////////////////////////////////////////////////////////////////////////
76     template <typename Elements, typename Modifiers>
77     struct make_composite<proto::tag::address_of, Elements, Modifiers>
78       : make_unary_composite<Elements, and_predicate> {};
79 
80 }}}
81 
82 namespace boost { namespace spirit { namespace traits
83 {
84     ///////////////////////////////////////////////////////////////////////////
85     template <typename Subject>
86     struct has_semantic_action<karma::and_predicate<Subject> >
87       : unary_has_semantic_action<Subject> {};
88 
89     ///////////////////////////////////////////////////////////////////////////
90     template <typename Subject, typename Attribute, typename Context
91       , typename Iterator>
92     struct handles_container<karma::and_predicate<Subject>, Attribute
93       , Context, Iterator>
94       : unary_handles_container<Subject, Attribute, Context, Iterator> {};
95 }}}
96 
97 #endif
98