noble (3) Tree::Simple::Visitor::GetAllDescendents.3pm.gz

NAME

       Tree::Simple::Visitor::GetAllDescendents - A Visitor for fetching all the descendents of a Tree::Simple
       object

SYNOPSIS

         use Tree::Simple::Visitor::GetAllDescendents;

         # create an instance of our visitor
         my $visitor = Tree::Simple::Visitor::GetAllDescendents->new();

         # pass the visitor to a Tree::Simple object
         $tree->accept($visitor);

         # you can also get the descendents
         # back as an array of node values
         my @descendents = $visitor->getDescendents();

         # for more complex node objects, you can specify
         # a node filter which will be used to extract the
         # information desired from each node
         $visitor->setNodeFilter(sub {
                       my ($t) = @_;
                       return $t->getNodeValue()->description();
                       });

DESCRIPTION

       Given a Tree::Simple instance this Visitor will return all the descendents recursively on down the
       hierarchy.

METHODS

       new There are no arguments to the constructor the object will be in its default state. You can use the
           "setNodeFilter" method to customize its behavior.

       setTraversalMethod ($visitor)
           By default we will use Tree::Simple's built in depth-first (pre-order) traverse method. If however,
           you desire the descendents to be returned in a different ordering, this can be accomplished using a
           different traversal method, you can supply a $visitor object implementing that traversal type to this
           method (See  Tree::Simple::Visitor::BreadthFirstTraversal, Tree::Simple::Visitor::PreOrderTraversal
           and Tree::Simple::Visitor::PostOrderTraversal).

       setNodeFilter ($filter_function)
           This method accepts a CODE reference as its $filter_function argument and throws an exception if it
           is not a code reference. This code reference is used to filter the tree nodes as they are collected.
           This can be used to customize output, or to gather specific information from a more complex tree
           node. The filter function should accept a single argument, which is the current Tree::Simple object.

       visit ($tree)
           This is the method that is used by Tree::Simple's "accept" method. It can also be used on its own, it
           requires the $tree argument to be a Tree::Simple object (or derived from a Tree::Simple object), and
           will throw and exception otherwise.

       getAllDescendents
           This method will give back and array of descendents in depth-first order (pre-order) or in the order
           specified by the "setTraversalMethod". If called in scalar context it will give an array reference,
           in list context it will return a regular array. This method is the same as calling "getResults".

Repository

       <https://github.com/ronsavage/Tree-Simple-VisitorFactory>

SUPPORT

       Bugs should be reported via the CPAN bug tracker at

       <https://github.com/ronsavage/Tree-Simple-VisitorFactory/issues>

CODE COVERAGE

       See the CODE COVERAGE section in Tree::Simple::VisitorFactory for more information.

SEE ALSO

       These Visitor classes are all subclasses of Tree::Simple::Visitor, which can be found in the Tree::Simple
       module, you should refer to that module for more information.

AUTHOR

       stevan little, <stevan@iinteractive.com>

COPYRIGHT AND LICENSE

       Copyright 2004, 2005 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.