perl-Data-Hierarchy

Handle data in a hierarchical structure

the Data::Hierarchy manpage provides a simple interface for manipulating inheritable data attached to a hierarchical environment (like a filesystem). One use of the Data::Hierarchy manpage is to allow an application to annotate paths in a real filesystem in a single compact data structure. However, the hierarchy does not actually need to correspond to an actual filesystem. Paths in a hierarchy are referred to in a Unix-like syntax; '"/"' is the root "directory". (You can specify a different separator character than the slash when you construct a Data::Hierarchy object.) With the exception of the root path, paths should never contain trailing slashes. You can associate properties, which are arbitrary name/value pairs, with any path. (Properties cannot contain the undefined value.) By default, properties are inherited by child paths: thus, if you store some data at '/some/path': $tree->store('/some/path', {color =>'red'}); you can fetch it again at a '/some/path/below/that': print $tree->get('/some/path/below/that')->{'color'}; On the other hand, properties whose names begin with dots are uninherited, or "sticky": $tree->store('/some/path', {'.color' =>'blue'}); print $tree->get('/some/path')->{'.color'}; # prints blue print $tree->get('/some/path/below/that')->{'.color'}; # undefined Note that you do not need to (and in fact, cannot) explicitly add "files" or "directories" to the hierarchy; you simply add and delete properties to paths.

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