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115 lines
3.5 KiB
115 lines
3.5 KiB
// 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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