Provided by: libtree-simple-visitorfactory-perl_0.15-1_all bug


       Tree::Simple::Visitor::PreOrderTraversal - A Visitor for pre-order traversal a
       Tree::Simple hierarchy


         use Tree::Simple::Visitor::PreOrderTraversal;

         # create an visitor
         my $visitor = Tree::Simple::Visitor::PreOrderTraversal->new();

         # pass our visitor to the tree

         # print our results
         print join ", " => $visitor->getResults();

         # this will print this:
         #   1 1.1 1.1.1 1.2 2 2.1 3 3.1
         # assuming your tree is like this:
         #   1
         #     1.1
         #       1.1.1
         #     1.2
         #   2
         #     2.1
         #   3
         #     3.1


       Pre-order traversal is a depth-first traversal method in which the sub-tree's are
       processed after the parent. It is essentially a wrapper around the base
       Tree::Simple::Visitor class, and is a separate module here for completeness. (If you have
       a post-order, you should have a pre-order too).


       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.

       includeTrunk ($boolean)
           Based upon the value of $boolean, this will tell the visitor to include the trunk of
           the tree in the traversal as well.

       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.

           This method returns the accumulated results of the application of the node filter to
           the tree.


       None that I am aware of. Of course, if you find a bug, let me know, and I will be sure to
       fix it.


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


       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.


       stevan little, <>


       Copyright 2004, 2005 by Infinity Interactive, Inc.


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

perl v5.22.2                                2016-05-Tree::Simple::Visitor::PreOrderTraversal(3pm)