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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_OMIT_MARCH_24_2007_0802AM) | |
8 | #define SPIRIT_OMIT_MARCH_24_2007_0802AM | |
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/skip_over.hpp> | |
16 | #include <boost/spirit/home/qi/parser.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::omit> // enables omit | |
30 | : mpl::true_ {}; | |
31 | }} | |
32 | ||
33 | namespace boost { namespace spirit { namespace qi | |
34 | { | |
35 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
36 | using spirit::omit; | |
37 | #endif | |
38 | using spirit::omit_type; | |
39 | ||
40 | /////////////////////////////////////////////////////////////////////////// | |
41 | // omit_directive forces the attribute of subject parser | |
42 | // to be unused_type | |
43 | /////////////////////////////////////////////////////////////////////////// | |
44 | template <typename Subject> | |
45 | struct omit_directive : unary_parser<omit_directive<Subject> > | |
46 | { | |
47 | typedef Subject subject_type; | |
48 | omit_directive(Subject const& subject_) | |
49 | : subject(subject_) {} | |
50 | ||
51 | template <typename Context, typename Iterator> | |
52 | struct attribute | |
53 | { | |
54 | typedef unused_type type; | |
55 | }; | |
56 | ||
57 | template <typename Iterator, typename Context | |
58 | , typename Skipper, typename Attribute> | |
59 | bool parse(Iterator& first, Iterator const& last | |
60 | , Context& context, Skipper const& skipper, Attribute& attr_) const | |
61 | { | |
62 | return subject.parse(first, last, context, skipper, attr_); | |
63 | } | |
64 | ||
65 | template <typename Context> | |
66 | info what(Context& context) const | |
67 | { | |
68 | return info("omit", subject.what(context)); | |
69 | } | |
70 | ||
71 | Subject subject; | |
72 | ||
73 | private: | |
74 | // silence MSVC warning C4512: assignment operator could not be generated | |
75 | omit_directive& operator= (omit_directive const&); | |
76 | }; | |
77 | ||
78 | /////////////////////////////////////////////////////////////////////////// | |
79 | // Parser generators: make_xxx function (objects) | |
80 | /////////////////////////////////////////////////////////////////////////// | |
81 | template <typename Subject, typename Modifiers> | |
82 | struct make_directive<tag::omit, Subject, Modifiers> | |
83 | { | |
84 | typedef omit_directive<Subject> result_type; | |
85 | result_type operator()(unused_type, Subject const& subject, unused_type) const | |
86 | { | |
87 | return result_type(subject); | |
88 | } | |
89 | }; | |
90 | }}} | |
91 | ||
92 | namespace boost { namespace spirit { namespace traits | |
93 | { | |
94 | /////////////////////////////////////////////////////////////////////////// | |
95 | template <typename Subject> | |
96 | struct has_semantic_action<qi::omit_directive<Subject> > | |
97 | : mpl::false_ {}; | |
98 | ||
99 | /////////////////////////////////////////////////////////////////////////// | |
100 | template <typename Subject, typename Attribute, typename Context | |
101 | , typename Iterator> | |
102 | struct handles_container<qi::omit_directive<Subject>, Attribute | |
103 | , Context, Iterator> | |
104 | : unary_handles_container<Subject, Attribute, Context, Iterator> {}; | |
105 | }}} | |
106 | ||
107 | #endif |