Generic pod-in to pod-out filter.
This is a superclass for filter modules using Pod::Abstract. Subclasses should override the \*(C`filter\*(C' sub. Pod::Abstract::Filter classes in the Pod::Abstract::Filter namespace will be used by the \*(C`paf\*(C' utility.
To create a filter, you need to implement:
Takes a Pod::Abstract::Node tree, and returns either another tree, or a string. If a string is returned, it will be re-parsed to be input to any following filter, or output directly if it is the last filter in the list. It is recommended your filter method produce a Node tree if you are able to, as this will improve interoperability with other \*(C`Pod::Abstract\*(C' based software.
If you want positional arguments following your filter in the style of:
paf find [thing] Pod::Abstract
then override require_params to list the named arguments that are to be accepted after the filter name.
Create a new filter with the specified arguments.
Override to return a list of parameters that must be provided. This will be accepted in order on the command line, unless they are first set using the \*(C`-flag=xxx\*(C' notation.
Get the named param. Read only.
Stub method. Does nothing, just returns the original tree.
Run the filter. If $arg is a string, it will be parsed first. Otherwise, the Abstract tree will be used. Returns either a string or an abstract tree (which may be the original tree, modified).
Ben Lilburne <[email protected]>
Copyright (C) 2009 Ben Lilburne
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.