Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: // 
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying 
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(BOOST_SPIRIT_KARMA_PADDING_MAY_06_2008_0436PM)
Chris@16: #define BOOST_SPIRIT_KARMA_PADDING_MAY_06_2008_0436PM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/info.hpp>
Chris@16: 
Chris@16: #include <boost/spirit/home/karma/domain.hpp>
Chris@16: #include <boost/spirit/home/karma/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/karma/delimit_out.hpp>
Chris@16: #include <boost/spirit/home/karma/auxiliary/lazy.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/generate_to.hpp>
Chris@16: #include <boost/spirit/home/support/unused.hpp>
Chris@16: #include <boost/fusion/include/at.hpp>
Chris@16: #include <boost/fusion/include/vector.hpp>
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Enablers
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16:     // enables pad(...)
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain
Chris@16:         , terminal_ex<tag::pad, fusion::vector1<A0> > > 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables lazy pad(...)
Chris@16:     template <>
Chris@16:     struct use_lazy_terminal<karma::domain, tag::pad, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit { namespace karma
Chris@16: {
Chris@16: #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
Chris@16:     using boost::spirit::pad;
Chris@16: #endif
Chris@16:     using boost::spirit::pad_type;
Chris@16: 
Chris@16:     struct binary_padding_generator 
Chris@16:       : primitive_generator<binary_padding_generator>
Chris@16:     {
Chris@16:         typedef mpl::int_<generator_properties::tracking> properties;
Chris@16: 
Chris@16:         template <typename Context, typename Unused>
Chris@16:         struct attribute
Chris@16:         {
Chris@16:             typedef unused_type type;
Chris@16:         };
Chris@16: 
Chris@16:         binary_padding_generator(int numpadbytes)
Chris@16:           : numpadbytes_(numpadbytes)
Chris@16:         {}
Chris@16: 
Chris@16:         template <
Chris@16:             typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context&, Delimiter const& d
Chris@16:           , Attribute const& /*attr*/) const
Chris@16:         {
Chris@16:             std::size_t count = sink.get_out_count() % numpadbytes_;
Chris@16:             if (count)
Chris@16:                 count = numpadbytes_ - count;
Chris@16: 
Chris@16:             bool result = true;
Chris@16:             while (result && count-- != 0)
Chris@16:                 result = detail::generate_to(sink, '\0');
Chris@16: 
Chris@16:             if (result)
Chris@16:                 result = karma::delimit_out(sink, d);  // always do post-delimiting
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static info what(Context const&)
Chris@16:         {
Chris@16:             return info("pad");
Chris@16:         }
Chris@16: 
Chris@16:         int numpadbytes_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Generator generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::pad, fusion::vector1<A0> >
Chris@16:       , Modifiers>
Chris@16:     {
Chris@16:         typedef binary_padding_generator result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, unused_type) const
Chris@16:         {
Chris@16:             return result_type(fusion::at_c<0>(term.args));
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif