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