/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Copyright (c) 2001-2011 Hartmut Kaiser
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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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================================================_==============================*/
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#if !defined(BOOST_SPIRIT_X3_PRINT_TOKEN_JANUARY_20_2013_0814AM)
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#define BOOST_SPIRIT_X3_PRINT_TOKEN_JANUARY_20_2013_0814AM
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <cctype>
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namespace boost { namespace spirit { namespace x3 { namespace traits
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{
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///////////////////////////////////////////////////////////////////////////
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// generate debug output for lookahead token (character) stream
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namespace detail
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{
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struct token_printer_debug_for_chars
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{
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template<typename Out, typename Char>
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static void print(Out& o, Char c)
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{
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using namespace std; // allow for ADL to find the proper iscntrl
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switch (c)
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{
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case '\a': o << "\\a"; break;
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case '\b': o << "\\b"; break;
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case '\f': o << "\\f"; break;
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case '\n': o << "\\n"; break;
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case '\r': o << "\\r"; break;
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case '\t': o << "\\t"; break;
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case '\v': o << "\\v"; break;
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default:
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if (c >= 0 && c < 127 && iscntrl(c))
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o << "\\" << std::oct << int(c);
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else
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o << Char(c);
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}
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}
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};
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// for token types where the comparison with char constants wouldn't work
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struct token_printer_debug
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{
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template<typename Out, typename T>
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static void print(Out& o, T const& val)
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{
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o << val;
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}
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};
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}
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template <typename T, typename Enable = void>
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struct token_printer_debug
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: mpl::if_<
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mpl::and_<
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is_convertible<T, char>, is_convertible<char, T> >
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, detail::token_printer_debug_for_chars
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, detail::token_printer_debug>::type
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{};
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template <typename Out, typename T>
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inline void print_token(Out& out, T const& val)
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{
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// allow to customize the token printer routine
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token_printer_debug<T>::print(out, val);
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}
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}}}}
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#endif
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