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