1/*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
3 Copyright (c) 2013 Agustin Berge
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(BOOST_SPIRIT_X3_SKIP_JANUARY_26_2008_0422PM)
9#define BOOST_SPIRIT_X3_SKIP_JANUARY_26_2008_0422PM
10
11#include <boost/spirit/home/x3/support/context.hpp>
12#include <boost/spirit/home/x3/support/unused.hpp>
13#include <boost/spirit/home/x3/core/skip_over.hpp>
14#include <boost/spirit/home/x3/core/parser.hpp>
15#include <boost/utility/enable_if.hpp>
16
17namespace boost { namespace spirit { namespace x3
18{
19 template <typename Subject>
20 struct reskip_directive : unary_parser<Subject, reskip_directive<Subject>>
21 {
22 typedef unary_parser<Subject, reskip_directive<Subject>> base_type;
23 static bool const is_pass_through_unary = true;
24 static bool const handles_container = Subject::handles_container;
25
26 constexpr reskip_directive(Subject const& subject)
27 : base_type(subject) {}
28
29 template <typename Iterator, typename Context
30 , typename RContext, typename Attribute>
31 typename disable_if<has_skipper<Context>, bool>::type
32 parse(Iterator& first, Iterator const& last
33 , Context const& context, RContext& rcontext, Attribute& attr) const
34 {
35 auto const& skipper =
36 detail::get_unused_skipper(x3::get<skipper_tag>(context));
37
38 return this->subject.parse(
39 first, last
40 , make_context<skipper_tag>(skipper, context)
41 , rcontext
42 , attr);
43 }
44 template <typename Iterator, typename Context
45 , typename RContext, typename Attribute>
46 typename enable_if<has_skipper<Context>, bool>::type
47 parse(Iterator& first, Iterator const& last
48 , Context const& context, RContext& rcontext, Attribute& attr) const
49 {
50 return this->subject.parse(
51 first, last
52 , context
53 , rcontext
54 , attr);
55 }
56 };
57
58 template <typename Subject, typename Skipper>
59 struct skip_directive : unary_parser<Subject, skip_directive<Subject, Skipper>>
60 {
61 typedef unary_parser<Subject, skip_directive<Subject, Skipper>> base_type;
62 static bool const is_pass_through_unary = true;
63 static bool const handles_container = Subject::handles_container;
64
65 constexpr skip_directive(Subject const& subject, Skipper const& skipper)
66 : base_type(subject)
67 , skipper(skipper)
68 {}
69
70 template <typename Iterator, typename Context
71 , typename RContext, typename Attribute>
72 bool parse(Iterator& first, Iterator const& last
73 , Context const& context, RContext& rcontext, Attribute& attr) const
74 {
75 return this->subject.parse(
76 first, last
77 , make_context<skipper_tag>(skipper, context)
78 , rcontext
79 , attr);
80 }
81
82 Skipper const skipper;
83 };
84
85 struct reskip_gen
86 {
87 template <typename Skipper>
88 struct skip_gen
89 {
90 constexpr skip_gen(Skipper const& skipper)
91 : skipper_(skipper) {}
92
93 template <typename Subject>
94 constexpr skip_directive<typename extension::as_parser<Subject>::value_type, Skipper>
95 operator[](Subject const& subject) const
96 {
97 return { as_parser(subject), skipper_ };
98 }
99
100 Skipper skipper_;
101 };
102
103 template <typename Skipper>
104 constexpr skip_gen<Skipper> const operator()(Skipper const& skipper) const
105 {
106 return { skipper };
107 }
108
109 template <typename Subject>
110 constexpr reskip_directive<typename extension::as_parser<Subject>::value_type>
111 operator[](Subject const& subject) const
112 {
113 return { as_parser(subject) };
114 }
115 };
116
117 constexpr auto skip = reskip_gen{};
118}}}
119
120#endif
121

source code of boost/libs/spirit/include/boost/spirit/home/x3/directive/skip.hpp