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[catagits/Gitalist.git] / local-lib5 / man / man3 / Tree::Simple::Visitor::PathToRoot.3pm

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.\" ========================================================================
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.IX Title "Tree::Simple::Visitor::PathToRoot 3"
.TH Tree::Simple::Visitor::PathToRoot 3 "2005-07-14" "perl v5.8.7" "User Contributed Perl Documentation"
.SH "NAME"
Tree::Simple::Visitor::PathToRoot \- A Visitor for finding the path back a Tree::Simple object's root
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Tree::Simple::Visitor::PathToRoot;
.Ve
.PP
.Vb 2
\&  # create an instance of our visitor
\&  my $visitor = Tree::Simple::Visitor::PathToRoot\->new();
.Ve
.PP
.Vb 2
\&  # pass the visitor to a Tree::Simple object
\&  $tree\->accept($visitor);
.Ve
.PP
.Vb 3
\&  # now get the accumulated path as a string 
\&  # with the '/' character as the delimiter
\&  print $visitor\->getPathAsString("/");
.Ve
.PP
.Vb 3
\&  # include the tree's trunk in your
\&  # output as well 
\&  $visitor\->includeTrunk();
.Ve
.PP
.Vb 7
\&  # 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();
\&                });
.Ve
.PP
.Vb 2
\&  # you can also get the path back as an array
\&  my @path = $visitor\->getPath();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Given a Tree::Simple object, this Visitor will find the path back to the tree's root node. 
.SH "METHODS"
.IX Header "METHODS"
.IP "\fBnew\fR" 4
.IX Item "new"
There are no arguments to the constructor the object will be in its default state. You can use the \f(CW\*(C`includeTrunk\*(C'\fR and \f(CW\*(C`setNodeFilter\*(C'\fR methods to customize its behavior.
.IP "\fBincludeTrunk ($boolean)\fR" 4
.IX Item "includeTrunk ($boolean)"
Based upon the value of \f(CW$boolean\fR, this will tell the visitor to collect the trunk of the tree as well. 
.IP "\fBsetNodeFilter ($filter_function)\fR" 4
.IX Item "setNodeFilter ($filter_function)"
This method accepts a \s-1CODE\s0 reference as its \f(CW$filter_function\fR argument and throws an exception if it is not a code reference. This code reference is used to filter the tree nodes as they are collected. This can be used to customize output, or to gather specific information from a more complex tree node. The filter function should accept a single argument, which is the current Tree::Simple object.
.IP "\fBvisit ($tree)\fR" 4
.IX Item "visit ($tree)"
This is the method that is used by Tree::Simple's \f(CW\*(C`accept\*(C'\fR method. It can also be used on its own, it requires the \f(CW$tree\fR argument to be a Tree::Simple object (or derived from a Tree::Simple object), and will throw and exception otherwise.
.IP "\fBgetPath\fR" 4
.IX Item "getPath"
This will return the collected path as an array, or in scalar context, as an array reference.
.IP "\fBgetPathAsString ($delimiter)\fR" 4
.IX Item "getPathAsString ($delimiter)"
This will return the collected path as a string with the path elements joined by a \f(CW$delimiter\fR. If no \f(CW$delimiter\fR is specified, the default (', ') will be used.
.SH "BUGS"
.IX Header "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. 
.SH "CODE COVERAGE"
.IX Header "CODE COVERAGE"
See the \fB\s-1CODE\s0 \s-1COVERAGE\s0\fR section in Tree::Simple::VisitorFactory for more inforamtion.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
These Visitor classes are all subclasses of \fBTree::Simple::Visitor\fR, which can be found in the \fBTree::Simple\fR module, you should refer to that module for more information.
.SH "AUTHOR"
.IX Header "AUTHOR"
stevan little, <stevan@iinteractive.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2004, 2005 by Infinity Interactive, Inc.
.PP
<http://www.iinteractive.com>
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.