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// 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_COLUMNS_DEC_03_2009_0736AM)
#define BOOST_SPIRIT_KARMA_COLUMNS_DEC_03_2009_0736AM
#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/delimit_out.hpp>
#include <boost/spirit/home/karma/detail/default_width.hpp>
#include <boost/spirit/home/karma/auxiliary/eol.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/fusion/include/at.hpp>
#include <boost/fusion/include/vector.hpp>
#include <boost/integer_traits.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <>
struct use_directive<karma::domain, tag::columns> // enables columns[]
: mpl::true_ {};
// enables columns(c)[g], where c provides the number of require columns
template <typename T>
struct use_directive<karma::domain
, terminal_ex<tag::columns, fusion::vector1<T> > >
: mpl::true_ {};
// enables *lazy* columns(c)[g]
template <>
struct use_lazy_directive<karma::domain, tag::columns, 1>
: mpl::true_ {};
// enables columns(c, d)[g], where c provides the number of require columns
// and d is the custom column-delimiter (default is karma::endl)
template <typename T1, typename T2>
struct use_directive<karma::domain
, terminal_ex<tag::columns, fusion::vector2<T1, T2> > >
: boost::spirit::traits::matches<karma::domain, T2> {};
// enables *lazy* columns(c, d)[g]
template <>
struct use_lazy_directive<karma::domain, tag::columns, 2>
: mpl::true_ {};
}}
namespace boost { namespace spirit { namespace karma
{
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
using spirit::columns;
#endif
using spirit::columns_type;
namespace detail
{
template <typename Delimiter, typename ColumnDelimiter>
struct columns_delimiter
{
columns_delimiter(Delimiter const& delim
, ColumnDelimiter const& cdelim, unsigned int const numcols)
: delimiter(delim), column_delimiter(cdelim)
, numcolumns(numcols), count(0) {}
template <typename OutputIterator, typename Context
, typename Delimiter_, typename Attribute>
bool generate(OutputIterator& sink, Context&, Delimiter_ const&
, Attribute const&) const
{
// first invoke the embedded delimiter
if (!karma::delimit_out(sink, delimiter))
return false;
// now we count the number of invocations and emit the column
// delimiter if needed
if ((++count % numcolumns) == 0)
return karma::delimit_out(sink, column_delimiter);
return true;
}
// generate a final column delimiter if the last invocation didn't
// emit one
template <typename OutputIterator>
bool delimit_out(OutputIterator& sink) const
{
if (count % numcolumns)
return karma::delimit_out(sink, column_delimiter);
return true;
}
Delimiter const& delimiter;
ColumnDelimiter const& column_delimiter;
unsigned int const numcolumns;
mutable unsigned int count;
private:
// silence MSVC warning C4512: assignment operator could not be generated
columns_delimiter& operator= (columns_delimiter const&);
};
}
///////////////////////////////////////////////////////////////////////////
// The columns_generator is used for columns(c, d)[...] directives.
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename NumColumns, typename ColumnsDelimiter>
struct columns_generator
: unary_generator<columns_generator<Subject, NumColumns, ColumnsDelimiter> >
{
typedef Subject subject_type;
typedef ColumnsDelimiter delimiter_type;
typedef mpl::int_<
subject_type::properties::value | delimiter_type::properties::value
> properties;
template <typename Context, typename Iterator>
struct attribute
: traits::attribute_of<subject_type, Context, Iterator>
{};
columns_generator(Subject const& subject, NumColumns const& cols
, ColumnsDelimiter const& cdelimiter)
: subject(subject), numcolumns(cols), column_delimiter(cdelimiter)
{
// having zero number of columns doesn't make any sense
BOOST_ASSERT(numcolumns > 0);
}
template <typename OutputIterator, typename Context
, typename Delimiter, typename Attribute>
bool generate(OutputIterator& sink, Context& ctx
, Delimiter const& delimiter, Attribute const& attr) const
{
// The columns generator dispatches to the embedded generator
// while supplying a new delimiter to use, wrapping the outer
// delimiter.
typedef detail::columns_delimiter<
Delimiter, ColumnsDelimiter
> columns_delimiter_type;
columns_delimiter_type d(delimiter, column_delimiter, numcolumns);
return subject.generate(sink, ctx, d, attr) && d.delimit_out(sink);
}
template <typename Context>
info what(Context& context) const
{
return info("columns", subject.what(context));
}
Subject subject;
NumColumns numcolumns;
ColumnsDelimiter column_delimiter;
};
///////////////////////////////////////////////////////////////////////////
// Generator generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
// creates columns[] directive
template <typename Subject, typename Modifiers>
struct make_directive<tag::columns, Subject, Modifiers>
{
typedef typename
result_of::compile<karma::domain, eol_type, Modifiers>::type
columns_delimiter_type;
typedef columns_generator<
Subject, detail::default_columns, columns_delimiter_type>
result_type;
result_type operator()(unused_type, Subject const& subject
, unused_type) const
{
#if defined(BOOST_SPIRIT_NO_PREDEFINED_TERMINALS)
eol_type const eol = eol_type();
#endif
return result_type(subject, detail::default_columns()
, compile<karma::domain>(eol));
}
};
// creates columns(c)[] directive generator (c is the number of columns)
template <typename T, typename Subject, typename Modifiers>
struct make_directive<
terminal_ex<tag::columns, fusion::vector1<T> >
, Subject, Modifiers
, typename enable_if_c<integer_traits<T>::is_integral>::type>
{
typedef typename
result_of::compile<karma::domain, eol_type, Modifiers>::type
columns_delimiter_type;
typedef columns_generator<
Subject, T, columns_delimiter_type
> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, Subject const& subject
, unused_type) const
{
#if defined(BOOST_SPIRIT_NO_PREDEFINED_TERMINALS)
eol_type const eol = eol_type();
#endif
return result_type(subject, fusion::at_c<0>(term.args)
, compile<karma::domain>(eol));
}
};
// creates columns(d)[] directive generator (d is the column delimiter)
template <typename T, typename Subject, typename Modifiers>
struct make_directive<
terminal_ex<tag::columns, fusion::vector1<T> >
, Subject, Modifiers
, typename enable_if<
mpl::and_<
spirit::traits::matches<karma::domain, T>,
mpl::not_<mpl::bool_<integer_traits<T>::is_integral> >
>
>::type>
{
typedef typename
result_of::compile<karma::domain, T, Modifiers>::type
columns_delimiter_type;
typedef columns_generator<
Subject, detail::default_columns, columns_delimiter_type
> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, Subject const& subject
, unused_type) const
{
return result_type(subject, detail::default_columns()
, compile<karma::domain>(fusion::at_c<0>(term.args)));
}
};
// creates columns(c, d)[] directive generator (c is the number of columns
// and d is the column delimiter)
template <typename T1, typename T2, typename Subject, typename Modifiers>
struct make_directive<
terminal_ex<tag::columns, fusion::vector2<T1, T2> >
, Subject, Modifiers>
{
typedef typename
result_of::compile<karma::domain, T2, Modifiers>::type
columns_delimiter_type;
typedef columns_generator<
Subject, T1, columns_delimiter_type
> 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)
, compile<karma::domain>(fusion::at_c<1>(term.args)));
}
};
}}}
namespace boost { namespace spirit { namespace traits
{
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename T1, typename T2>
struct has_semantic_action<karma::columns_generator<Subject, T1, T2> >
: unary_has_semantic_action<Subject> {};
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename T1, typename T2, typename Attribute
, typename Context, typename Iterator>
struct handles_container<
karma::columns_generator<Subject, T1, T2>, Attribute
, Context, Iterator>
: unary_handles_container<Subject, Attribute, Context, Iterator> {};
}}}
#endif
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