1 files changed, 79 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/support/traits/print_token.hpp b/boost/spirit/home/x3/support/traits/print_token.hpp
new file mode 100644
index 0000000000..f1429f4776
--- /dev/null
+++ b/boost/spirit/home/x3/support/traits/print_token.hpp
@@ -0,0 +1,79 @@
+/*=============================================================================
+    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
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#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