Reference

Tree::Simple::Visitor::ToNestedArray(3pm)

A Visitor for creating nested array trees from Tree::Simple objects.

NAME

Tree::Simple::Visitor::ToNestedArray - A Visitor for creating nested array trees from Tree::Simple objects.

SYNOPSIS

  use Tree::Simple::Visitor::ToNestedArray;
  my $visitor = Tree::Simple::Visitor::ToNestedArray->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"),
                );
  # include the trunk (Root)
  $visitor->includeTrunk(1);
  # visit the tree
  $tree->accept($visitor);
  my $array_tree = $visitor->getResults();
  # this then creates the equivalent nested array tree:
  # [
  # 'Root', [
  #     'Child1', [
  #             'GrandChild1',
  #             'GrandChild2'
  #             ],
  #     'Child2'
  #     ]
  # ]
  # if you don't include the trunk (Root) then ...
  $tree->accept($visitor);
  my $array_tree = $visitor->getResults();
  # this then creates the following nested array tree:
  # [
  #   'Child1', [
  #           'GrandChild1',
  #           'GrandChild2'
  #           ],
  #   'Child2'
  # ]

DESCRIPTION

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

METHODS

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 array 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 array tree. The $filter_function is passed a Tree::Simple object, and is expected to return the value desired for inclusion into the array 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 array tree constructed.

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, <[email protected]>

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.

History