/usr/share/perl5/Tree/Simple/Visitor/VariableDepthClone.pm is in libtree-simple-visitorfactory-perl 0.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | package Tree::Simple::Visitor::VariableDepthClone;
use strict;
use warnings;
use Scalar::Util 'blessed';
our $VERSION = '0.15';
use base qw(Tree::Simple::Visitor);
sub new {
my ($_class) = @_;
my $class = ref($_class) || $_class;
my $visitor = {};
bless($visitor, $class);
$visitor->_init();
return $visitor;
}
sub _init {
my ($self) = @_;
$self->{clone_depth} = undef;
$self->SUPER::_init();
}
sub setCloneDepth {
my ($self, $clone_depth) = @_;
(defined($clone_depth))
|| die "Insufficient Arguments : you must supply a clone depth";
$self->{clone_depth} = $clone_depth;
}
sub getClone {
my ($self) = @_;
return $self->getResults()->[0];
}
sub visit {
my ($self, $tree) = @_;
(blessed($tree) && $tree->isa("Tree::Simple"))
|| die "Insufficient Arguments : You must supply a valid Tree::Simple object";
my $filter = $self->getNodeFilter();
# get a new instance of the root tree type
my $new_root = blessed($tree)->new($tree->ROOT);
my $new_tree = $new_root;
if ($self->includeTrunk()) {
my $cloned_trunk = blessed($tree)->new();
$cloned_trunk->setNodeValue(
Tree::Simple::_cloneNode($tree->getNodeValue())
);
$filter->($tree, $cloned_trunk) if defined $filter;
$new_tree->addChild($cloned_trunk);
$new_tree = $cloned_trunk;
}
$self->_cloneTree($tree, $new_tree, $self->{clone_depth}, $filter);
$self->setResults($new_root);
}
sub _cloneTree {
my ($self, $tree, $clone, $depth, $filter) = @_;
return if $depth <= 0;
foreach my $child ($tree->getAllChildren()) {
my $cloned_child = blessed($child)->new();
$cloned_child->setNodeValue(
Tree::Simple::_cloneNode($child->getNodeValue())
);
$filter->($child, $cloned_child) if defined $filter;
$clone->addChild($cloned_child);
$self->_cloneTree($child, $cloned_child, $depth - 1, $filter) unless $child->isLeaf();
}
}
1;
__END__
=head1 NAME
Tree::Simple::Visitor::VariableDepthClone - A Visitor for cloning parts of Tree::Simple hierarchy
=head1 SYNOPSIS
use Tree::Simple::Visitor::VariableDepthClone;
# create an visitor
my $visitor = Tree::Simple::Visitor::VariableDepthClone->new();
$visitor->setCloneDepth(3);
# pass our visitor to the tree
$tree->accept($visitor);
my $partial_tree = $visitor->getClone();
=head1 DESCRIPTION
This visitor will clone
=head1 METHODS
=over 4
=item B<new>
There are no arguments to the constructor the object will be in its default state. You can use the C<setNodeFilter> method to customize its behavior.
=item B<includeTrunk ($boolean)>
Based upon the value of C<$boolean>, this will tell the visitor to include the trunk of the tree in the traversal as well. This basically means it will clone the root node as well.
=item B<setCloneDepth ($number)>
=item B<setNodeFilter ($filter_function)>
This method accepts a CODE reference as its C<$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 cloned.
=item B<visit ($tree)>
This is the method that is used by Tree::Simple's C<accept> method. It can also be used on its own, it requires the C<$tree> argument to be a Tree::Simple object (or derived from a Tree::Simple object), and will throw and exception otherwise.
=item B<getClone>
This method returns the cloned partial tree.
=back
=head1 BUGS
None that I am aware of. Of course, if you find a bug, let me know, and I will be sure to fix it.
=head1 CODE COVERAGE
See the B<CODE COVERAGE> section in L<Tree::Simple::VisitorFactory> for more information.
=head1 SEE ALSO
These Visitor classes are all subclasses of B<Tree::Simple::Visitor>, which can be found in the B<Tree::Simple> module, you should refer to that module for more information.
=head1 AUTHOR
stevan little, E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2005 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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