1Tree::Simple::Visitor::UPsaetrhTCooRnotorti(b3u)ted PerlTrDeoec:u:mSeinmtpaltei:o:nVisitor::PathToRoot(3)
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NAME

6       Tree::Simple::Visitor::PathToRoot - A Visitor for finding the path back
7       a Tree::Simple object's root
8

SYNOPSIS

10         use Tree::Simple::Visitor::PathToRoot;
11
12         # create an instance of our visitor
13         my $visitor = Tree::Simple::Visitor::PathToRoot->new();
14
15         # pass the visitor to a Tree::Simple object
16         $tree->accept($visitor);
17
18         # now get the accumulated path as a string
19         # with the '/' character as the delimiter
20         print $visitor->getPathAsString("/");
21
22         # include the tree's trunk in your
23         # output as well
24         $visitor->includeTrunk();
25
26         # for more complex node objects, you can specify
27         # a node filter which will be used to extract the
28         # information desired from each node
29         $visitor->setNodeFilter(sub {
30                       my ($t) = @_;
31                       return $t->getNodeValue()->description();
32                       });
33
34         # you can also get the path back as an array
35         my @path = $visitor->getPath();
36

DESCRIPTION

38       Given a Tree::Simple object, this Visitor will find the path back to
39       the tree's root node.
40

METHODS

42       new There are no arguments to the constructor the object will be in its
43           default state. You can use the "includeTrunk" and "setNodeFilter"
44           methods to customize its behavior.
45
46       includeTrunk ($boolean)
47           Based upon the value of $boolean, this will tell the visitor to
48           collect the trunk of the tree as well.
49
50       setNodeFilter ($filter_function)
51           This method accepts a CODE reference as its $filter_function argu‐
52           ment and throws an exception if it is not a code reference. This
53           code reference is used to filter the tree nodes as they are col‐
54           lected. This can be used to customize output, or to gather specific
55           information from a more complex tree node. The filter function
56           should accept a single argument, which is the current Tree::Simple
57           object.
58
59       visit ($tree)
60           This is the method that is used by Tree::Simple's "accept" method.
61           It can also be used on its own, it requires the $tree argument to
62           be a Tree::Simple object (or derived from a Tree::Simple object),
63           and will throw and exception otherwise.
64
65       getPath
66           This will return the collected path as an array, or in scalar con‐
67           text, as an array reference.
68
69       getPathAsString ($delimiter)
70           This will return the collected path as a string with the path ele‐
71           ments joined by a $delimiter. If no $delimiter is specified, the
72           default (', ') will be used.
73

BUGS

75       None that I am aware of. Of course, if you find a bug, let me know, and
76       I will be sure to fix it.
77

CODE COVERAGE

79       See the CODE COVERAGE section in Tree::Simple::VisitorFactory for more
80       inforamtion.
81

SEE ALSO

83       These Visitor classes are all subclasses of Tree::Simple::Visitor,
84       which can be found in the Tree::Simple module, you should refer to that
85       module for more information.
86

AUTHOR

88       stevan little, <stevan@iinteractive.com>
89

91       Copyright 2004, 2005 by Infinity Interactive, Inc.
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93       <http://www.iinteractive.com>
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95       This library is free software; you can redistribute it and/or modify it
96       under the same terms as Perl itself.
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100perl v5.8.8                       2005-07-1T3ree::Simple::Visitor::PathToRoot(3)
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