| // Copyright (c) 2001-2011 Hartmut Kaiser | |
| // | |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| #if !defined(BOOST_SPIRIT_KARMA_STREAM_MAY_01_2007_0310PM) | |
| #define BOOST_SPIRIT_KARMA_STREAM_MAY_01_2007_0310PM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/spirit/home/support/common_terminals.hpp> | |
| #include <boost/spirit/home/support/info.hpp> | |
| #include <boost/spirit/home/support/container.hpp> | |
| #include <boost/spirit/home/support/detail/hold_any.hpp> | |
| #include <boost/spirit/home/support/detail/get_encoding.hpp> | |
| #include <boost/spirit/home/karma/domain.hpp> | |
| #include <boost/spirit/home/karma/meta_compiler.hpp> | |
| #include <boost/spirit/home/karma/delimit_out.hpp> | |
| #include <boost/spirit/home/karma/auxiliary/lazy.hpp> | |
| #include <boost/spirit/home/karma/stream/detail/format_manip.hpp> | |
| #include <boost/spirit/home/karma/stream/detail/iterator_sink.hpp> | |
| #include <boost/spirit/home/karma/detail/get_casetag.hpp> | |
| #include <boost/spirit/home/karma/detail/extract_from.hpp> | |
| #include <boost/fusion/include/at.hpp> | |
| #include <boost/fusion/include/vector.hpp> | |
| #include <boost/fusion/include/cons.hpp> | |
| #include <boost/utility/enable_if.hpp> | |
| #include <boost/type_traits/is_same.hpp> | |
| #include <iosfwd> | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace boost { namespace spirit | |
| { | |
| namespace tag | |
| { | |
| template <typename Char = char> | |
| struct stream_tag {}; | |
| } | |
| namespace karma | |
| { | |
| /////////////////////////////////////////////////////////////////////// | |
| // This one is the class that the user can instantiate directly in | |
| // order to create a customized int generator | |
| template <typename Char = char> | |
| struct stream_generator | |
| : spirit::terminal<tag::stream_tag<Char> > | |
| {}; | |
| } | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Enablers | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <> | |
| struct use_terminal<karma::domain, tag::stream> // enables stream | |
| : mpl::true_ {}; | |
| template <> | |
| struct use_terminal<karma::domain, tag::wstream> // enables wstream | |
| : mpl::true_ {}; | |
| template <typename A0> | |
| struct use_terminal<karma::domain // enables stream(...) | |
| , terminal_ex<tag::stream, fusion::vector1<A0> > | |
| > : mpl::true_ {}; | |
| template <typename A0> | |
| struct use_terminal<karma::domain // enables wstream(...) | |
| , terminal_ex<tag::wstream, fusion::vector1<A0> > | |
| > : mpl::true_ {}; | |
| template <> // enables stream(f) | |
| struct use_lazy_terminal< | |
| karma::domain, tag::stream, 1 /*arity*/ | |
| > : mpl::true_ {}; | |
| template <> // enables wstream(f) | |
| struct use_lazy_terminal< | |
| karma::domain, tag::wstream, 1 /*arity*/ | |
| > : mpl::true_ {}; | |
| // enables stream_generator<char_type> | |
| template <typename Char> | |
| struct use_terminal<karma::domain, tag::stream_tag<Char> > | |
| : mpl::true_ {}; | |
| template <typename Char, typename A0> | |
| struct use_terminal<karma::domain | |
| , terminal_ex<tag::stream_tag<Char>, fusion::vector1<A0> > | |
| > : mpl::true_ {}; | |
| template <typename Char> | |
| struct use_lazy_terminal< | |
| karma::domain, tag::stream_tag<Char>, 1 /*arity*/ | |
| > : mpl::true_ {}; | |
| }} | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace boost { namespace spirit { namespace karma | |
| { | |
| using spirit::stream; | |
| using spirit::wstream; | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Char, typename CharEncoding, typename Tag> | |
| struct any_stream_generator | |
| : primitive_generator<any_stream_generator<Char, CharEncoding, Tag> > | |
| { | |
| template <typename Context, typename Unused = unused_type> | |
| struct attribute | |
| { | |
| typedef spirit::hold_any type; | |
| }; | |
| // any_stream_generator has an attached attribute | |
| template < | |
| typename OutputIterator, typename Context, typename Delimiter | |
| , typename Attribute | |
| > | |
| static bool generate(OutputIterator& sink, Context& context | |
| , Delimiter const& d, Attribute const& attr) | |
| { | |
| typedef karma::detail::iterator_sink< | |
| OutputIterator, Char, CharEncoding, Tag | |
| > sink_device; | |
| if (!traits::has_optional_value(attr)) | |
| return false; | |
| // use existing operator<<() | |
| typedef typename attribute<Context>::type attribute_type; | |
| boost::iostreams::stream<sink_device> ostr(sink); | |
| ostr << traits::extract_from<attribute_type>(attr, context) << std::flush; | |
| if (ostr.good()) | |
| return karma::delimit_out(sink, d); // always do post-delimiting | |
| return false; | |
| } | |
| // this is a special overload to detect if the output iterator has been | |
| // generated by a format_manip object. | |
| template < | |
| typename T, typename Traits, typename Properties, typename Context | |
| , typename Delimiter, typename Attribute | |
| > | |
| static bool generate( | |
| karma::detail::output_iterator< | |
| karma::ostream_iterator<T, Char, Traits>, Properties | |
| >& sink, Context& context, Delimiter const& d | |
| , Attribute const& attr) | |
| { | |
| typedef karma::detail::output_iterator< | |
| karma::ostream_iterator<T, Char, Traits>, Properties | |
| > output_iterator; | |
| typedef karma::detail::iterator_sink< | |
| output_iterator, Char, CharEncoding, Tag | |
| > sink_device; | |
| if (!traits::has_optional_value(attr)) | |
| return false; | |
| // use existing operator<<() | |
| typedef typename attribute<Context>::type attribute_type; | |
| boost::iostreams::stream<sink_device> ostr(sink); | |
| ostr.imbue(sink.get_ostream().getloc()); | |
| ostr << traits::extract_from<attribute_type>(attr, context) | |
| << std::flush; | |
| if (ostr.good()) | |
| return karma::delimit_out(sink, d); // always do post-delimiting | |
| return false; | |
| } | |
| // this any_stream has no parameter attached, it needs to have been | |
| // initialized from a value/variable | |
| template <typename OutputIterator, typename Context | |
| , typename Delimiter> | |
| static bool | |
| generate(OutputIterator&, Context&, Delimiter const&, unused_type) | |
| { | |
| // It is not possible (doesn't make sense) to use stream generators | |
| // without providing any attribute, as the generator doesn't 'know' | |
| // what to output. The following assertion fires if this situation | |
| // is detected in your code. | |
| BOOST_SPIRIT_ASSERT_MSG(false, stream_not_usable_without_attribute, ()); | |
| return false; | |
| } | |
| template <typename Context> | |
| info what(Context& /*context*/) const | |
| { | |
| return info("stream"); | |
| } | |
| }; | |
| template <typename T, typename Char, typename CharEncoding, typename Tag> | |
| struct lit_stream_generator | |
| : primitive_generator<lit_stream_generator<T, Char, CharEncoding, Tag> > | |
| { | |
| template <typename Context, typename Unused> | |
| struct attribute | |
| { | |
| typedef unused_type type; | |
| }; | |
| lit_stream_generator(typename add_reference<T>::type t) | |
| : t_(t) | |
| {} | |
| // lit_stream_generator has an attached parameter | |
| // this overload will be used in the normal case (not called from | |
| // format_manip). | |
| template < | |
| typename OutputIterator, typename Context, typename Delimiter | |
| , typename Attribute> | |
| bool generate(OutputIterator& sink, Context&, Delimiter const& d | |
| , Attribute const&) | |
| { | |
| typedef karma::detail::iterator_sink< | |
| OutputIterator, Char, CharEncoding, Tag | |
| > sink_device; | |
| boost::iostreams::stream<sink_device> ostr(sink); | |
| ostr << t_ << std::flush; // use existing operator<<() | |
| if (ostr.good()) | |
| return karma::delimit_out(sink, d); // always do post-delimiting | |
| return false; | |
| } | |
| // this is a special overload to detect if the output iterator has been | |
| // generated by a format_manip object. | |
| template < | |
| typename T1, typename Traits, typename Properties | |
| , typename Context, typename Delimiter, typename Attribute> | |
| bool generate( | |
| karma::detail::output_iterator< | |
| karma::ostream_iterator<T1, Char, Traits>, Properties | |
| >& sink, Context&, Delimiter const& d, Attribute const&) | |
| { | |
| typedef karma::detail::output_iterator< | |
| karma::ostream_iterator<T1, Char, Traits>, Properties | |
| > output_iterator; | |
| typedef karma::detail::iterator_sink< | |
| output_iterator, Char, CharEncoding, Tag | |
| > sink_device; | |
| boost::iostreams::stream<sink_device> ostr(sink); | |
| ostr.imbue(sink.get_ostream().getloc()); | |
| ostr << t_ << std::flush; // use existing operator<<() | |
| if (ostr.good()) | |
| return karma::delimit_out(sink, d); // always do post-delimiting | |
| return false; | |
| } | |
| template <typename Context> | |
| info what(Context& /*context*/) const | |
| { | |
| return info("any-stream"); | |
| } | |
| T t_; | |
| private: | |
| // silence MSVC warning C4512: assignment operator could not be generated | |
| lit_stream_generator& operator= (lit_stream_generator const&); | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Generator generators: make_xxx function (objects) | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Char, typename Modifiers> | |
| struct make_stream | |
| { | |
| static bool const lower = | |
| has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; | |
| static bool const upper = | |
| has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; | |
| typedef any_stream_generator< | |
| Char | |
| , typename spirit::detail::get_encoding_with_case< | |
| Modifiers, unused_type, lower || upper>::type | |
| , typename detail::get_casetag<Modifiers, lower || upper>::type | |
| > result_type; | |
| result_type operator()(unused_type, unused_type) const | |
| { | |
| return result_type(); | |
| } | |
| }; | |
| // stream | |
| template <typename Modifiers> | |
| struct make_primitive<tag::stream, Modifiers> | |
| : make_stream<char, Modifiers> {}; | |
| // wstream | |
| template <typename Modifiers> | |
| struct make_primitive<tag::wstream, Modifiers> | |
| : make_stream<wchar_t, Modifiers> {}; | |
| // any_stream_generator<char_type> | |
| template <typename Char, typename Modifiers> | |
| struct make_primitive<tag::stream_tag<Char>, Modifiers> | |
| : make_stream<Char, Modifiers> {}; | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Char, typename A0, typename Modifiers> | |
| struct make_any_stream | |
| { | |
| static bool const lower = | |
| has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; | |
| static bool const upper = | |
| has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; | |
| typedef typename add_const<A0>::type const_attribute; | |
| typedef lit_stream_generator< | |
| const_attribute, Char | |
| , typename spirit::detail::get_encoding_with_case< | |
| Modifiers, unused_type, lower || upper>::type | |
| , typename detail::get_casetag<Modifiers, lower || upper>::type | |
| > result_type; | |
| template <typename Terminal> | |
| result_type operator()(Terminal const& term, unused_type) const | |
| { | |
| return result_type(fusion::at_c<0>(term.args)); | |
| } | |
| }; | |
| // stream(...) | |
| template <typename Modifiers, typename A0> | |
| struct make_primitive< | |
| terminal_ex<tag::stream, fusion::vector1<A0> >, Modifiers> | |
| : make_any_stream<char, A0, Modifiers> {}; | |
| // wstream(...) | |
| template <typename Modifiers, typename A0> | |
| struct make_primitive< | |
| terminal_ex<tag::wstream, fusion::vector1<A0> >, Modifiers> | |
| : make_any_stream<wchar_t, A0, Modifiers> {}; | |
| // any_stream_generator<char_type>(...) | |
| template <typename Char, typename Modifiers, typename A0> | |
| struct make_primitive< | |
| terminal_ex<tag::stream_tag<Char>, fusion::vector1<A0> > | |
| , Modifiers> | |
| : make_any_stream<Char, A0, Modifiers> {}; | |
| }}} | |
| #endif |