1Tree::Simple::Visitor::UTsoeNresCtoendtHraisbhu(t3e)d PeTrrleeD:o:cSuimmepnltea:t:iVoinsitor::ToNestedHash(3)
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6 Tree::Simple::Visitor::ToNestedHash - A Visitor for creating nested
7 hash trees from Tree::Simple objects.
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10 use Tree::Simple::Visitor::ToNestedHash;
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12 my $visitor = Tree::Simple::Visitor::ToNestedHash->new();
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14 # given this Tree::Simple tree
15 my $tree = Tree::Simple->new("Root")
16 ->addChildren(
17 Tree::Simple->new("Child1")
18 ->addChildren(
19 Tree::Simple->new("GrandChild1"),
20 Tree::Simple->new("GrandChild2")
21 ),
22 Tree::Simple->new("Child2"),
23 );
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25 $tree->accept($visitor);
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27 my $array_tree = $visitor->getResults();
28
29 # this then creates the equivalent nested array tree:
30 # {
31 # Root => {
32 # Child1 => {
33 # GrandChild1 => {},
34 # GrandChild2 => {}
35 # },
36 # Child2 => {}
37 # }
38 # }
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41 Given a tree constructed from a Tree::Simple hierarchy, this Visitor
42 will create the equivalent tree of nested hashes.
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45 new There are no arguments to the constructor the object will be in its
46 default state. You can use the "setNodeFilter" and "includTrunk"
47 methods to customize its behavior.
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49 includTrunk ($boolean)
50 Setting the $boolean value to true (1) will cause the node value of
51 the tree's root to be included in the nested hash output, setting
52 it to false will do the opposite.
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54 setNodeFilter ($filter_function)
55 This method accepts a CODE reference as its $filter_function
56 argument and throws an exception if it is not a code reference.
57 This code reference is used to filter the tree nodes as they are
58 placed into the hash tree. The $filter_function is passed a
59 Tree::Simple object, and is expected to return the value desired
60 for inclusion into the hash tree.
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62 visit ($tree)
63 This is the method that is used by Tree::Simple's "accept" method.
64 It can also be used on its own, it requires the $tree argument to
65 be a Tree::Simple object (or derived from a Tree::Simple object),
66 and will throw and exception otherwise.
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68 getResults
69 This method will return the hash tree constructed.
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72 <https://github.com/ronsavage/Tree-Simple-VisitorFactory>
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75 Bugs should be reported via the CPAN bug tracker at
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77 <https://github.com/ronsavage/Tree-Simple-VisitorFactory/issues>
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80 See the CODE COVERAGE section in Tree::Simple::VisitorFactory for more
81 information.
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84 These Visitor classes are all subclasses of Tree::Simple::Visitor,
85 which can be found in the Tree::Simple module, you should refer to that
86 module for more information.
87
89 stevan little, <stevan@iinteractive.com>
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92 Copyright 2004, 2005 by Infinity Interactive, Inc.
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94 <http://www.iinteractive.com>
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96 This library is free software; you can redistribute it and/or modify it
97 under the same terms as Perl itself.
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101perl v5.36.0 2023-01T-r2e0e::Simple::Visitor::ToNestedHash(3)