examples: simplify/improve

* examples/variant.yy: Put yylex in yy::, and simplify accordingly.
Minor formatting changes.

examples/variant.yy

@@ -38,7 +38,10 @@ typedef std::list<std::string> strings_type;
 #include <sstream>
 
   // Prototype of the yylex function providing subsequent tokens.
-  static yy::parser::symbol_type yylex ();
+  namespace yy
+  {
+    static parser::symbol_type yylex ();
+  }
 
   // Printing a list of strings.
   // Koening look up will look into std, since that's an std::list.
@@ -91,42 +94,45 @@ item:
 ;
 %%
 
+namespace yy
+{
   // The yylex function providing subsequent tokens:
-// TEXT         "I have three numbers for you:"
+  // TEXT         "I have three numbers for you."
   // NUMBER       1
   // NUMBER       2
   // NUMBER       3
-// TEXT         " and that's all!"
+  // TEXT         "And that's all!"
   // END_OF_FILE
 
   static
-yy::parser::symbol_type
+  parser::symbol_type
   yylex ()
   {
     static int stage = -1;
     ++stage;
-  yy::parser::location_type loc(0, stage + 1, stage + 1);
+    parser::location_type loc(0, stage + 1, stage + 1);
     switch (stage)
       {
       case 0:
-      return yy::parser::make_TEXT ("I have three numbers for you.", loc);
+        return parser::make_TEXT ("I have three numbers for you.", loc);
       case 1:
       case 2:
       case 3:
-      return yy::parser::make_NUMBER (stage, loc);
+        return parser::make_NUMBER (stage, loc);
       case 4:
-      return yy::parser::make_TEXT ("And that's all!", loc);
+        return parser::make_TEXT ("And that's all!", loc);
       default:
-      return yy::parser::make_END_OF_FILE (loc);
+        return parser::make_END_OF_FILE (loc);
       }
   }
 
   // Mandatory error function
   void
-yy::parser::error (const yy::parser::location_type& loc, const std::string& msg)
+  parser::error (const parser::location_type& loc, const std::string& msg)
   {
     std::cerr << loc << ": " << msg << std::endl;
   }
+}
 
 int
 main ()