[Boost-commit] svn:boost r56446 - trunk/boost/spirit/home/qi/nonterminal

Subject: [Boost-commit] svn:boost r56446 - trunk/boost/spirit/home/qi/nonterminal
From: hartmut.kaiser_at_[hidden]
Date: 2009-09-27 17:09:20

Author: hkaiser
Date: 2009-09-27 17:09:19 EDT (Sun, 27 Sep 2009)
New Revision: 56446
URL: http://svn.boost.org/trac/boost/changeset/56446

Log:
Spirit: added simple token printer for parser trace output
Text files modified: 
   trunk/boost/spirit/home/qi/nonterminal/simple_trace.hpp |    63 +++++++++++++++++++++++++++++++++++++++ 
   1 files changed, 62 insertions(+), 1 deletions(-)

Modified: trunk/boost/spirit/home/qi/nonterminal/simple_trace.hpp
==============================================================================
--- trunk/boost/spirit/home/qi/nonterminal/simple_trace.hpp	(original)
+++ trunk/boost/spirit/home/qi/nonterminal/simple_trace.hpp	2009-09-27 17:09:19 EDT (Sun, 27 Sep 2009)
@@ -32,6 +32,67 @@
 
 namespace boost { namespace spirit { namespace qi
 {
+    namespace detail
+    {
+        struct token_printer_aux_for_chars
+        {
+            template<typename Char>
+            static void print(std::ostream& o, Char c)
+            {
+                using namespace std;    // allow for ADL to find the proper iscntrl
+
+                if (c == static_cast<Char>('\a'))
+                    o << "\\a";
+                else if (c == static_cast<Char>('\b'))
+                    o << "\\b";
+                else if (c == static_cast<Char>('\f'))
+                    o << "\\f";
+                else if (c == static_cast<Char>('\n'))
+                    o << "\\n";
+                else if (c == static_cast<Char>('\r'))
+                    o << "\\r";
+                else if (c == static_cast<Char>('\t'))
+                    o << "\\t";
+                else if (c == static_cast<Char>('\v'))
+                    o << "\\v";
+                else if (iscntrl(c))
+                    o << "\\" << std::oct << static_cast<int>(c);
+                else
+                    o << static_cast<char>(c);
+            }
+        };
+
+        // for token types where the comparison with char constants wouldn't work
+        struct token_printer_aux_for_other_types
+        {
+            template<typename Char>
+            static void print(std::ostream& o, Char c)
+            {
+                o << c;
+            }
+        };
+
+        template <typename Char>
+        struct token_printer_aux
+          : mpl::if_<
+                mpl::and_<
+                    is_convertible<Char, char>, is_convertible<char, Char> >
+              , token_printer_aux_for_chars
+              , token_printer_aux_for_other_types>::type
+        {};
+
+        template<typename Char>
+        inline void token_printer(std::ostream& o, Char c)
+        {
+            // allow to customize the token printer routine
+#if !defined(BOOST_SPIRIT_DEBUG_TOKEN_PRINTER)
+            token_printer_aux<Char>::print(o, c);
+#else
+            BOOST_SPIRIT_DEBUG_TOKEN_PRINTER(o, c);
+#endif
+        }
+    }
+
     struct simple_trace
     {
         void print_indent(int n) const
@@ -51,7 +112,7 @@
             BOOST_SPIRIT_DEBUG_OUT << '<' << tag << '>';
             int const n = BOOST_SPIRIT_DEBUG_PRINT_SOME;
             for (int i = 0; first != last && i != n && *first; ++i, ++first)
-                BOOST_SPIRIT_DEBUG_OUT << *first;
+                detail::token_printer(BOOST_SPIRIT_DEBUG_OUT, *first);
             BOOST_SPIRIT_DEBUG_OUT << "</" << tag << '>' << std::endl;
         }