ceph/src/boost/libs/spirit/include/boost/spirit/home/karma/directive/no_delimit.hpp

   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
  25 namespace 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
  36 namespace 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
 101 namespace 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