1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2001-2011 Hartmut Kaiser
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#ifndef BOOST_SPIRIT_QI_DIRECTIVE_NO_SKIP_HPP
9#define BOOST_SPIRIT_QI_DIRECTIVE_NO_SKIP_HPP
10
11#if defined(_MSC_VER)
12#pragma once
13#endif
14
15#include <boost/spirit/home/qi/meta_compiler.hpp>
16#include <boost/spirit/home/qi/skip_over.hpp>
17#include <boost/spirit/home/qi/parser.hpp>
18#include <boost/spirit/home/qi/detail/unused_skipper.hpp>
19#include <boost/spirit/home/support/unused.hpp>
20#include <boost/spirit/home/support/common_terminals.hpp>
21#include <boost/spirit/home/support/attributes.hpp>
22#include <boost/spirit/home/support/info.hpp>
23#include <boost/spirit/home/support/has_semantic_action.hpp>
24#include <boost/spirit/home/support/handles_container.hpp>
25#include <boost/utility/enable_if.hpp>
26
27namespace boost { namespace spirit
28{
29 ///////////////////////////////////////////////////////////////////////////
30 // Enablers
31 ///////////////////////////////////////////////////////////////////////////
32 template <>
33 struct use_directive<qi::domain, tag::no_skip> // enables no_skip
34 : mpl::true_ {};
35}}
36
37namespace boost { namespace spirit { namespace qi
38{
39#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
40 using spirit::no_skip;
41#endif
42 using spirit::no_skip_type;
43
44 // same as lexeme[], but does not pre-skip
45 template <typename Subject>
46 struct no_skip_directive : unary_parser<no_skip_directive<Subject> >
47 {
48 typedef Subject subject_type;
49 no_skip_directive(Subject const& subject_)
50 : subject(subject_) {}
51
52 template <typename Context, typename Iterator>
53 struct attribute
54 {
55 typedef typename
56 traits::attribute_of<subject_type, Context, Iterator>::type
57 type;
58 };
59
60 template <typename Iterator, typename Context
61 , typename Skipper, typename Attribute>
62 typename disable_if<detail::is_unused_skipper<Skipper>, bool>::type
63 parse(Iterator& first, Iterator const& last
64 , Context& context, Skipper const& skipper
65 , Attribute& attr_) const
66 {
67 return subject.parse(first, last, context
68 , detail::unused_skipper<Skipper>(skipper), attr_);
69 }
70 template <typename Iterator, typename Context
71 , typename Skipper, typename Attribute>
72 typename enable_if<detail::is_unused_skipper<Skipper>, bool>::type
73 parse(Iterator& first, Iterator const& last
74 , Context& context, Skipper const& skipper
75 , Attribute& attr_) const
76 {
77 return subject.parse(first, last, context
78 , skipper, attr_);
79 }
80
81 template <typename Context>
82 info what(Context& context) const
83 {
84 return info("no_skip", subject.what(context));
85
86 }
87
88 Subject subject;
89 };
90
91 ///////////////////////////////////////////////////////////////////////////
92 // Parser generators: make_xxx function (objects)
93 ///////////////////////////////////////////////////////////////////////////
94 template <typename Subject, typename Modifiers>
95 struct make_directive<tag::no_skip, Subject, Modifiers>
96 {
97 typedef no_skip_directive<Subject> result_type;
98 result_type operator()(unused_type, Subject const& subject, unused_type) const
99 {
100 return result_type(subject);
101 }
102 };
103}}}
104
105namespace boost { namespace spirit { namespace traits
106{
107 ///////////////////////////////////////////////////////////////////////////
108 template <typename Subject>
109 struct has_semantic_action<qi::no_skip_directive<Subject> >
110 : unary_has_semantic_action<Subject> {};
111
112 ///////////////////////////////////////////////////////////////////////////
113 template <typename Subject, typename Attribute, typename Context
114 , typename Iterator>
115 struct handles_container<qi::no_skip_directive<Subject>, Attribute
116 , Context, Iterator>
117 : unary_handles_container<Subject, Attribute, Context, Iterator> {};
118}}}
119
120#endif
121

source code of boost/libs/spirit/include/boost/spirit/home/qi/directive/no_skip.hpp