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+.\" ========================================================================
+.\"
+.IX Title "Tree::Simple::Visitor::PreOrderTraversal 3"
+.TH Tree::Simple::Visitor::PreOrderTraversal 3 "2005-07-14" "perl v5.8.7" "User Contributed Perl Documentation"
+.SH "NAME"
+Tree::Simple::Visitor::PreOrderTraversal \- A Visitor for pre\-order traversal a Tree::Simple hierarchy
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& use Tree::Simple::Visitor::PreOrderTraversal;
+.Ve
+.PP
+.Vb 2
+\& # create an visitor
+\& my $visitor = Tree::Simple::Visitor::PreOrderTraversal\->new();
+.Ve
+.PP
+.Vb 2
+\& # pass our visitor to the tree
+\& $tree\->accept($visitor);
+.Ve
+.PP
+.Vb 2
+\& # print our results
+\& print join ", " => $visitor\->getResults();
+.Ve
+.PP
+.Vb 11
+\& # this will print this:
+\& # 1 1.1 1.1.1 1.2 2 2.1 3 3.1
+\& # assuming your tree is like this:
+\& # 1
+\& # 1.1
+\& # 1.1.1
+\& # 1.2
+\& # 2
+\& # 2.1
+\& # 3
+\& # 3.1
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+Pre-order traversal is a depth-first traversal method in which the sub\-tree's are processed \fIafter\fR the parent. It is essentially a wrapper around the base Tree::Simple::Visitor class, and is a seperate module here for completeness. (If you have a post\-order, you should have a pre-order too).
+.SH "METHODS"
+.IX Header "METHODS"
+.IP "\fBnew\fR" 4
+.IX Item "new"
+There are no arguments to the constructor the object will be in its default state. You can use the \f(CW\*(C`setNodeFilter\*(C'\fR method to customize its behavior.
+.IP "\fBincludeTrunk ($boolean)\fR" 4
+.IX Item "includeTrunk ($boolean)"
+Based upon the value of \f(CW$boolean\fR, this will tell the visitor to include the trunk of the tree in the traversal 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 "\fBgetResults\fR" 4
+.IX Item "getResults"
+This method returns the accumulated results of the application of the node filter to the tree.
+.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.
projects / catagits/Gitalist.git / blobdiff