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