1// Copyright (c) 2001-2011 Hartmut Kaiser
2//
3// Distributed under the Boost Software License, Version 1.0. (See accompanying
4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6#if !defined(BOOST_SPIRIT_KARMA_NO_DELIMIT_JAN_19_2010_0920AM)
7#define BOOST_SPIRIT_KARMA_NO_DELIMIT_JAN_19_2010_0920AM
8
9#if defined(_MSC_VER)
10#pragma once
11#endif
12
13#include <boost/spirit/home/karma/meta_compiler.hpp>
14#include <boost/spirit/home/karma/generator.hpp>
15#include <boost/spirit/home/karma/domain.hpp>
16#include <boost/spirit/home/karma/detail/unused_delimiter.hpp>
17#include <boost/spirit/home/karma/auxiliary/lazy.hpp>
18#include <boost/spirit/home/support/unused.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#include <boost/spirit/home/karma/detail/attributes.hpp>
23#include <boost/spirit/home/support/info.hpp>
24
25namespace boost { namespace spirit
26{
27 ///////////////////////////////////////////////////////////////////////////
28 // Enablers
29 ///////////////////////////////////////////////////////////////////////////
30 template <>
31 struct use_directive<karma::domain, tag::no_delimit> // enables no_delimit[]
32 : mpl::true_ {};
33
34}}
35
36namespace boost { namespace spirit { namespace karma
37{
38#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
39 using spirit::no_delimit;
40#endif
41 using spirit::no_delimit_type;
42
43 ///////////////////////////////////////////////////////////////////////////
44 // The no_delimit generator is used for no_delimit[...] directives.
45 ///////////////////////////////////////////////////////////////////////////
46 template <typename Subject>
47 struct no_delimit_generator
48 : unary_generator<no_delimit_generator<Subject> >
49 {
50 typedef Subject subject_type;
51 typedef typename subject_type::properties properties;
52
53 template <typename Context, typename Iterator>
54 struct attribute
55 : traits::attribute_of<subject_type, Context, Iterator>
56 {};
57
58 no_delimit_generator(Subject const& subject)
59 : subject(subject) {}
60
61 template <typename OutputIterator, typename Context, typename Delimiter
62 , typename Attribute>
63 bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
64 , Attribute const& attr) const
65 {
66 // the no_delimit generator simply dispatches to the embedded
67 // generator while supplying unused_delimiter as the new delimiter
68 // to avoid delimiting down the generator stream
69 typedef detail::unused_delimiter<Delimiter> unused_delimiter;
70
71 // the difference to verbatim[] is that this does not post-delimit
72 return subject.generate(sink, ctx, unused_delimiter(d), attr);
73 }
74
75 template <typename Context>
76 info what(Context& context) const
77 {
78 return info("no_delimit", subject.what(context));
79 }
80
81 Subject subject;
82 };
83
84 ///////////////////////////////////////////////////////////////////////////
85 // Generator generators: make_xxx function (objects)
86 ///////////////////////////////////////////////////////////////////////////
87 template <typename Subject, typename Modifiers>
88 struct make_directive<tag::no_delimit, Subject, Modifiers>
89 {
90 typedef no_delimit_generator<Subject> result_type;
91
92 result_type
93 operator()(unused_type, Subject const& subject, unused_type) const
94 {
95 return result_type(subject);
96 }
97 };
98
99}}}
100
101namespace boost { namespace spirit { namespace traits
102{
103 ///////////////////////////////////////////////////////////////////////////
104 template <typename Subject>
105 struct has_semantic_action<karma::no_delimit_generator<Subject> >
106 : unary_has_semantic_action<Subject> {};
107
108 ///////////////////////////////////////////////////////////////////////////
109 template <typename Subject, typename Attribute, typename Context
110 , typename Iterator>
111 struct handles_container<karma::no_delimit_generator<Subject>, Attribute
112 , Context, Iterator>
113 : unary_handles_container<Subject, Attribute, Context, Iterator> {};
114}}}
115
116#endif
117

source code of boost/libs/spirit/include/boost/spirit/home/karma/directive/no_delimit.hpp