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_MAXWIDTH_MAR_18_2009_0827AM)
Chris@16: #define BOOST_SPIRIT_KARMA_MAXWIDTH_MAR_18_2009_0827AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/karma/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/karma/generator.hpp>
Chris@16: #include <boost/spirit/home/karma/domain.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/output_iterator.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/default_width.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/support/unused.hpp>
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/has_semantic_action.hpp>
Chris@16: #include <boost/spirit/home/support/handles_container.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/attributes.hpp>
Chris@16: #include <boost/spirit/home/support/info.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: #include <boost/lexical_cast.hpp>
Chris@16: #include <boost/detail/workaround.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 maxwidth[]
Chris@16:     template <>
Chris@16:     struct use_directive<karma::domain, tag::maxwidth>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables maxwidth(w)[g], where w provides a maxwidth
Chris@16:     template <typename T>
Chris@16:     struct use_directive<karma::domain
Chris@16:           , terminal_ex<tag::maxwidth, fusion::vector1<T> > > 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables *lazy* maxwidth(w)[g], where w provides a maxwidth
Chris@16:     template <>
Chris@16:     struct use_lazy_directive<karma::domain, tag::maxwidth, 1> 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables maxwidth(w, r)[g], where w provides a maxwidth and r is an output
Chris@16:     // iterator used to receive the rest of the output not fitting into the 
Chris@16:     // maxwidth limit
Chris@16:     template <typename T, typename RestIter>
Chris@16:     struct use_directive<karma::domain
Chris@16:           , terminal_ex<tag::maxwidth, fusion::vector2<T, RestIter> > > 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables *lazy* maxwidth(w, r)[g], where w provides a maxwidth and r is 
Chris@16:     // an output iterator used to receive the rest of the output not fitting 
Chris@16:     // into the maxwidth limit
Chris@16:     template <>
Chris@16:     struct use_lazy_directive<karma::domain, tag::maxwidth, 2> 
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 spirit::maxwidth;
Chris@16: #endif
Chris@16:     using spirit::maxwidth_type;
Chris@16: 
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         template <typename OutputIterator, typename RestIterator>
Chris@16:         bool buffer_copy_rest(detail::enable_buffering<OutputIterator>& buff
Chris@16:           , std::size_t start_at, RestIterator& dest)
Chris@16:         {
Chris@16:             return buff.buffer_copy_rest(dest, start_at);
Chris@16:         }
Chris@16: 
Chris@16:         template <typename OutputIterator>
Chris@16:         bool buffer_copy_rest(detail::enable_buffering<OutputIterator>&
Chris@16:           , std::size_t, unused_type)
Chris@16:         {
Chris@16:             return true;
Chris@16:         }
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         //  The maxwidth_generate template function is used for all the 
Chris@16:         //  different flavors of the maxwidth[] directive. 
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter, 
Chris@16:             typename Attribute, typename Embedded, typename Rest>
Chris@16:         inline static bool 
Chris@16:         maxwidth_generate(OutputIterator& sink, Context& ctx, 
Chris@16:             Delimiter const& d, Attribute const& attr, Embedded const& e, 
Chris@16:             unsigned int const maxwidth, Rest& restdest) 
Chris@16:         {
Chris@16: #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600))
Chris@16:             e; // suppresses warning: C4100: 'e' : unreferenced formal parameter
Chris@16: #endif
Chris@16:             // wrap the given output iterator to allow buffering, but disable 
Chris@16:             // counting
Chris@16:             detail::enable_buffering<OutputIterator> buffering(sink);
Chris@16: 
Chris@16:             // generate the underlying output and copy the embedded 
Chris@16:             // output to the target output iterator applying the given 
Chris@16:             // maxwidth
Chris@16:             bool r = false;
Chris@16:             {
Chris@16:                 detail::disable_counting<OutputIterator> nocounting(sink);
Chris@16:                 r = e.generate(sink, ctx, d, attr);
Chris@16:             }   // re-enable counting
Chris@16: 
Chris@16:             return r && buffering.buffer_copy(maxwidth) &&
Chris@16:                    buffer_copy_rest(buffering, maxwidth, restdest);
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     //  The maxwidth directive is used for maxwidth[...]
Chris@16:     //  generators. It uses default values for the generated width (defined via
Chris@16:     //  the BOOST_KARMA_DEFAULT_FIELD_MAXWIDTH constant).
Chris@16:     // 
Chris@16:     //  The maxwidth with width directive, is used for generators
Chris@16:     //  like maxwidth(width)[...]. 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename Width = detail::default_max_width
Chris@16:       , typename Rest = unused_type>
Chris@16:     struct maxwidth_width
Chris@16:       : unary_generator<maxwidth_width<Subject, Width, Rest> >
Chris@16:     {
Chris@16:         typedef Subject subject_type;
Chris@16: 
Chris@16:         typedef mpl::int_<
Chris@16:             generator_properties::countingbuffer | subject_type::properties::value
Chris@16:         > properties;
Chris@16: 
Chris@16:         template <typename Context, typename Iterator>
Chris@16:         struct attribute
Chris@16:           : traits::attribute_of<subject_type, Context, Iterator>
Chris@16:         {};
Chris@16: 
Chris@16:         maxwidth_width(Subject const& subject, Width const& w = Width()
Chris@16:             , Rest const& r = Rest())
Chris@16:           : subject(subject), width(w), rest(r) {}
Chris@16: 
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
Chris@16:           , Attribute const& attr) const
Chris@16:         {
Chris@16:             return detail::maxwidth_generate(sink, ctx, d, attr, subject
Chris@16:               , width, rest);
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         info what(Context& context) const
Chris@16:         {
Chris@16:             return info("maxwidth", subject.what(context));
Chris@16:         }
Chris@16: 
Chris@16:         Subject subject;
Chris@16:         Width width;
Chris@16:         Rest rest;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Generator generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16:     // creates maxwidth[] directive generator
Chris@16:     template <typename Subject, typename Modifiers>
Chris@16:     struct make_directive<tag::maxwidth, Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef maxwidth_width<Subject> result_type;
Chris@16:         result_type operator()(unused_type, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     // creates maxwidth(width)[] directive generator
Chris@16:     template <typename T, typename Subject, typename Modifiers>
Chris@16:     struct make_directive<
Chris@16:         terminal_ex<tag::maxwidth, fusion::vector1<T> >
Chris@16:       , Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef maxwidth_width<Subject, T> result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject, fusion::at_c<0>(term.args), unused);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     // creates maxwidth(width, restiter)[] directive generator
Chris@16:     template <
Chris@16:         typename T, typename RestIter, typename Subject, typename Modifiers>
Chris@16:     struct make_directive<
Chris@16:         terminal_ex<tag::maxwidth, fusion::vector2<T, RestIter> >
Chris@16:       , Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef maxwidth_width<Subject, T, RestIter> result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject, fusion::at_c<0>(term.args)
Chris@16:               , fusion::at_c<1>(term.args));
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: }}} // namespace boost::spirit::karma
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace traits
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename Width, typename Rest>
Chris@16:     struct has_semantic_action<karma::maxwidth_width<Subject, Width, Rest> >
Chris@16:       : unary_has_semantic_action<Subject> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename Attribute, typename Context
Chris@16:         , typename Iterator>
Chris@16:     struct handles_container<karma::maxwidth_width<Subject>, Attribute
Chris@16:         , Context, Iterator>
Chris@16:       : unary_handles_container<Subject, Attribute, Context, Iterator> {};
Chris@16: }}}
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: