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131 .IX Title "Tree::Simple::Visitor::PathToRoot 3"
132 .TH Tree::Simple::Visitor::PathToRoot 3 "2005-07-14" "perl v5.8.7" "User Contributed Perl Documentation"
134 Tree::Simple::Visitor::PathToRoot \- A Visitor for finding the path back a Tree::Simple object's root
136 .IX Header "SYNOPSIS"
138 \& use Tree::Simple::Visitor::PathToRoot;
142 \& # create an instance of our visitor
143 \& my $visitor = Tree::Simple::Visitor::PathToRoot\->new();
147 \& # pass the visitor to a Tree::Simple object
148 \& $tree\->accept($visitor);
152 \& # now get the accumulated path as a string
153 \& # with the '/' character as the delimiter
154 \& print $visitor\->getPathAsString("/");
158 \& # include the tree's trunk in your
160 \& $visitor\->includeTrunk();
164 \& # for more complex node objects, you can specify
165 \& # a node filter which will be used to extract the
166 \& # information desired from each node
167 \& $visitor\->setNodeFilter(sub {
169 \& return $t\->getNodeValue()\->description();
174 \& # you can also get the path back as an array
175 \& my @path = $visitor\->getPath();
178 .IX Header "DESCRIPTION"
179 Given a Tree::Simple object, this Visitor will find the path back to the tree's root node.
184 There are no arguments to the constructor the object will be in its default state. You can use the \f(CW\*(C`includeTrunk\*(C'\fR and \f(CW\*(C`setNodeFilter\*(C'\fR methods to customize its behavior.
185 .IP "\fBincludeTrunk ($boolean)\fR" 4
186 .IX Item "includeTrunk ($boolean)"
187 Based upon the value of \f(CW$boolean\fR, this will tell the visitor to collect the trunk of the tree as well.
188 .IP "\fBsetNodeFilter ($filter_function)\fR" 4
189 .IX Item "setNodeFilter ($filter_function)"
190 This method accepts a \s-1CODE\s0 reference as its \f(CW$filter_function\fR argument and throws an exception if it is not a code reference. This code reference is used to filter the tree nodes as they are collected. This can be used to customize output, or to gather specific information from a more complex tree node. The filter function should accept a single argument, which is the current Tree::Simple object.
191 .IP "\fBvisit ($tree)\fR" 4
192 .IX Item "visit ($tree)"
193 This is the method that is used by Tree::Simple's \f(CW\*(C`accept\*(C'\fR method. It can also be used on its own, it requires the \f(CW$tree\fR argument to be a Tree::Simple object (or derived from a Tree::Simple object), and will throw and exception otherwise.
194 .IP "\fBgetPath\fR" 4
196 This will return the collected path as an array, or in scalar context, as an array reference.
197 .IP "\fBgetPathAsString ($delimiter)\fR" 4
198 .IX Item "getPathAsString ($delimiter)"
199 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.
202 None that I am aware of. Of course, if you find a bug, let me know, and I will be sure to fix it.
204 .IX Header "CODE COVERAGE"
205 See the \fB\s-1CODE\s0 \s-1COVERAGE\s0\fR section in Tree::Simple::VisitorFactory for more inforamtion.
207 .IX Header "SEE ALSO"
208 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.
211 stevan little, <stevan@iinteractive.com>
212 .SH "COPYRIGHT AND LICENSE"
213 .IX Header "COPYRIGHT AND LICENSE"
214 Copyright 2004, 2005 by Infinity Interactive, Inc.
216 <http://www.iinteractive.com>
218 This library is free software; you can redistribute it and/or modify
219 it under the same terms as Perl itself.