pretty print for templates

src/xml-cxx/xml.hxx

@@ -458,6 +458,10 @@ namespace xml {
     public:
       Factory(const Node& t) throw();
       const Node& operator*() const throw();
+      friend std::ostream& operator<<(std::ostream& os,
+                                      const Factory& factory) throw();
+      static std::ostream& print(std::ostream& os, const Node& node,
+                                 unsigned int level=0) throw();
       std::auto_ptr<Node> read(std::istream& is)
           throw(wrong_end_tag, wrong_start_tag, tag_expected, type_mismatch,
                 second_slash_in_tag, character_after_slash,

src/xml.cxx

@@ -525,6 +525,63 @@ namespace xml {
   const Node& Factory::operator*() const throw() {
     return _template[0];
   }
+  std::ostream& operator<<(std::ostream& os, const Factory& factory) throw() {
+    return factory.print(os, *factory);
+  }
+  std::ostream& Factory::print(std::ostream& os, const Node& node,
+                               unsigned int level) throw() {
+    if (node.children()) {
+      os<<std::string(level, '\t')<<'<'<<node.name();
+      for (Attributes::const_iterator it(node.attributes().begin());
+           it!=node.attributes().end(); ++it)
+        os<<' '<<it->first<<"=\""<<it->second<<'"';
+      os<<'>';
+      if (dynamic_cast<const UnsignedInteger*>(&node))
+        os<<" (Unsigned Integer";
+      else if (dynamic_cast<const String*>(&node))
+        os<<" (String";
+      else
+        os<<" (Node";
+      if (node.min()==1 && node.max()==1)
+        os<<", required exactly once)";
+      else if (node.min()==1 && node.max()==0)
+        os<<", required at least once)";
+      else if (node.min()==0 && node.max()==0)
+        os<<", 0..n)";
+      else if (node.min()==0 && node.max()==1)
+        os<<", optional)";
+      else
+        os<<", "<<node.min()<<".."<<node.max()<<")";
+      os<<std::endl;
+      for (Node::size_type i(0); i<node.children(); ++i)
+        print(os, node[i], level+1);
+      os<<std::string(level, '\t')<<"</"<<node.name()<<'>';
+    } else {
+      os<<std::string(level, '\t')<<'<'<<node.name();
+      for (Attributes::const_iterator it(node.attributes().begin());
+           it!=node.attributes().end(); ++it)
+        os<<' '<<it->first<<"=\""<<it->second<<'"';
+      os<<"/>";
+      if (dynamic_cast<const UnsignedInteger*>(&node))
+        os<<" (Unsigned Integer";
+      else if (dynamic_cast<const String*>(&node))
+        os<<" (String";
+      else
+        os<<" (Node";
+      if (node.min()==1 && node.max()==1)
+        os<<", required exactly once)";
+      else if (node.min()==1 && node.max()==0)
+        os<<", required at least once)";
+      else if (node.min()==0 && node.max()==0)
+        os<<", 0..n)";
+      else if (node.min()==0 && node.max()==1)
+        os<<", optional)";
+      else
+        os<<", "<<node.min()<<".."<<node.max()<<")";
+      os<<std::endl;
+    }
+    return os;
+  }
   std::auto_ptr<Node> Factory::read(std::istream& is)
       throw(wrong_end_tag, wrong_start_tag, tag_expected, type_mismatch,
             second_slash_in_tag,