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Data::Grove::VisiUser3Contributed Perl DocumeData::Grove::Visitor(3)

       Data::Grove::Visitor - add visitor/callback methods to
       Data::Grove objects

        use Data::Grove::Visitor;

        @results = $object->accept ($visitor, ...);
        @results = $object->accept_name ($visitor, ...);
        @results = $object->children_accept ($visitor, ...);
        @results = $object->children_accept_name ($visitor, ...);

       Data::Grove::Visitor adds visitor methods (callbacks) to
       Data::Grove objects.  A ``visitor'' is a class (a package)
       you write that has methods (subs) corresponding to the
       objects in the classes being visited.  You use the visitor
       methods by creating an instance of your visitor class, and
       then calling `"accept($my_visitor)"' on the top-most object
       you want to visit, that object will in turn call your visitor
       back with `"visit_OBJECT"', where OBJECT is the type of

       There are several forms of `"accept"'.  Simply calling
       `"accept"' calls your package back using the object type of
       the object you are visiting.  Calling `"accept_name"' on an
       element object calls you back with `"visit_name_NAME"' where
       NAME is the tag name of the element, on all other objects
       it's as if you called `"accept"'.

       All of the forms of `"accept"' return a concatenated list of
       the result of all `"visit"' methods.

       `"children_accept"' calls `"accept"' on each of the children
       of the element.  This is generally used in element callbacks
       to recurse down into the element's children, you don't need
       to get the element's contents and call `"accept"' on each
       item.  `"children_accept_name"' does the same but calling
       `"accept_name"' on each of the children.  `"attr_accept"'
       calls `"accept"' on each of the objects in the named

       Refer to the documentation of the classes you are visiting
       (XML::Grove, etc.) for the type names (`"element"', `"docu‐
       ment"', etc.) of the objects it implements.

       The hash keys `"Contents"' and `"Name"' are used to indicate
       objects with children (for `"children_accept"') and named
       objects (for `"accept_name"').

       These are random ideas that haven't been implemented yet:

       ·   Several objects fall into subclasses, or you may want to
           be able to subclass a visited object and still be able to
           tell the difference.  In SGML::Grove I had used the pack‐
           age name in the callback (`"visit_SGML_Element"') instead
           of a generic name (`"visit_element"').  The idea here
           would be to try calling `"visit_PACKAGE"' with the most
           specific class first, then try superclasses, and lastly
           to try the generic.

       Ken MacLeod,

       perl(1), Data::Grove

       Extensible Markup Language (XML) <>

3rd Berkeley Distribution    perl v5.6.1     Data::Grove::Visitor(3)
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