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/*=============================================================================
Copyright (c) 2001-2014 Joel de Guzman
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_X3_PRINT_ATTRIBUTE_JANUARY_20_2013_0814AM)
#define BOOST_SPIRIT_X3_PRINT_ATTRIBUTE_JANUARY_20_2013_0814AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/variant.hpp>
#include <boost/optional/optional.hpp>
#include <boost/fusion/include/is_sequence.hpp>
#include <boost/fusion/include/for_each.hpp>
#include <boost/spirit/home/x3/support/traits/attribute_category.hpp>
#include <boost/spirit/home/x3/support/traits/is_variant.hpp>
namespace boost { namespace spirit { namespace x3 { namespace traits
{
template <typename Out, typename T>
void print_attribute(Out& out, T const& val);
template <typename Out>
inline void print_attribute(Out&, unused_type) {}
///////////////////////////////////////////////////////////////////////////
namespace detail
{
template <typename Out>
struct print_fusion_sequence
{
print_fusion_sequence(Out& out)
: out(out), is_first(true) {}
typedef void result_type;
template <typename T>
void operator()(T const& val) const
{
if (is_first)
is_first = false;
else
out << ", ";
x3::traits::print_attribute(out, val);
}
Out& out;
mutable bool is_first;
};
// print elements in a variant
template <typename Out>
struct print_visitor : static_visitor<>
{
print_visitor(Out& out) : out(out) {}
template <typename T>
void operator()(T const& val) const
{
x3::traits::print_attribute(out, val);
}
Out& out;
};
}
template <typename Out, typename T, typename Enable = void>
struct print_attribute_debug
{
// for plain data types
template <typename T_>
static void call(Out& out, T_ const& val, unused_attribute)
{
out << "unused";
}
// for plain data types
template <typename T_>
static void call(Out& out, T_ const& val, plain_attribute)
{
out << val;
}
// for fusion data types
template <typename T_>
static void call(Out& out, T_ const& val, tuple_attribute)
{
out << '[';
fusion::for_each(val, detail::print_fusion_sequence<Out>(out));
out << ']';
}
// stl container
template <typename T_>
static void call(Out& out, T_ const& val, container_attribute)
{
out << '[';
if (!traits::is_empty(val))
{
bool first = true;
typename container_iterator<T_ const>::type iend = traits::end(val);
for (typename container_iterator<T_ const>::type i = traits::begin(val);
!traits::compare(i, iend); traits::next(i))
{
if (!first)
out << ", ";
first = false;
x3::traits::print_attribute(out, traits::deref(i));
}
}
out << ']';
}
// for variant types
template <typename T_>
static void call(Out& out, T_ const& val, variant_attribute)
{
apply_visitor(detail::print_visitor<Out>(out), val);
}
// for optional types
template <typename T_>
static void call(Out& out, T_ const& val, optional_attribute)
{
if (val)
x3::traits::print_attribute(out, *val);
else
out << "[empty]";
}
// main entry point
static void call(Out& out, T const& val)
{
call(out, val, typename attribute_category<T>::type());
}
};
///////////////////////////////////////////////////////////////////////////
template <typename Out, typename T>
inline void print_attribute(Out& out, T const& val)
{
print_attribute_debug<Out, T>::call(out, val);
}
}}}}
#endif
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