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246 lines
9.1 KiB
246 lines
9.1 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_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/lexical_cast.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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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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