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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_TOKEN_JANUARY_20_2013_0814AM)
#define BOOST_SPIRIT_X3_PRINT_TOKEN_JANUARY_20_2013_0814AM
#include <boost/mpl/if.hpp>
#include <boost/mpl/and.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <cctype>
namespace boost { namespace spirit { namespace x3 { namespace traits
{
///////////////////////////////////////////////////////////////////////////
// generate debug output for lookahead token (character) stream
namespace detail
{
struct token_printer_debug_for_chars
{
template<typename Out, typename Char>
static void print(Out& o, Char c)
{
using namespace std; // allow for ADL to find the proper iscntrl
switch (c)
{
case '\a': o << "\\a"; break;
case '\b': o << "\\b"; break;
case '\f': o << "\\f"; break;
case '\n': o << "\\n"; break;
case '\r': o << "\\r"; break;
case '\t': o << "\\t"; break;
case '\v': o << "\\v"; break;
default:
if (c >= 0 && c < 127 && iscntrl(c))
o << "\\" << std::oct << int(c);
else
o << Char(c);
}
}
};
// for token types where the comparison with char constants wouldn't work
struct token_printer_debug
{
template<typename Out, typename T>
static void print(Out& o, T const& val)
{
o << val;
}
};
}
template <typename T, typename Enable = void>
struct token_printer_debug
: mpl::if_<
mpl::and_<
is_convertible<T, char>, is_convertible<char, T> >
, detail::token_printer_debug_for_chars
, detail::token_printer_debug>::type
{};
template <typename Out, typename T>
inline void print_token(Out& out, T const& val)
{
// allow to customize the token printer routine
token_printer_debug<T>::print(out, val);
}
}}}}
#endif
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