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