GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
Tree::Simple::Visitor::ToNestedHash(3) User Contributed Perl Documentation Tree::Simple::Visitor::ToNestedHash(3)

Tree::Simple::Visitor::ToNestedHash - A Visitor for creating nested hash trees from Tree::Simple objects.

  use Tree::Simple::Visitor::ToNestedHash;

  my $visitor = Tree::Simple::Visitor::ToNestedHash->new();

  # given this Tree::Simple tree
  my $tree = Tree::Simple->new("Root")
                ->addChildren(
                    Tree::Simple->new("Child1")
                        ->addChildren(
                            Tree::Simple->new("GrandChild1"),
                            Tree::Simple->new("GrandChild2")
                        ),
                    Tree::Simple->new("Child2"),
                );

  $tree->accept($visitor);

  my $array_tree = $visitor->getResults();

  # this then creates the equivalent nested array tree:
  # {
  # Root => {
  #         Child1 => {
  #                 GrandChild1 => {},
  #                 GrandChild2 => {}
  #                 },
  #         Child2 => {}
  #         }
  # }

Given a tree constructed from a Tree::Simple hierarchy, this Visitor will create the equivalent tree of nested hashes.

new
There are no arguments to the constructor the object will be in its default state. You can use the "setNodeFilter" and "includTrunk" methods to customize its behavior.
includTrunk ($boolean)
Setting the $boolean value to true (1) will cause the node value of the tree's root to be included in the nested hash output, setting it to false will do the opposite.
setNodeFilter ($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 placed into the hash tree. The $filter_function is passed a Tree::Simple object, and is expected to return the value desired for inclusion into the hash tree.
visit ($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.
getResults
This method will return the hash tree constructed.

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

Bugs should be reported via the CPAN bug tracker at

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

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, <stevan@iinteractive.com>

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.

2021-02-02 perl v5.32.1

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.