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package Pod::Abstract::Filter;
use strict;
use warnings;
use Pod::Abstract;
our $VERSION = '0.20';
=head1 NAME
Pod::Abstract::Filter - Generic Pod-in to Pod-out filter.
=head1 DESCRIPTION
This is a superclass for filter modules using
Pod::Abstract. Subclasses should override the C<filter>
sub. Pod::Abstract::Filter classes in the Pod::Abstract::Filter
namespace will be used by the C<paf> utility.
To create a filter, you need to implement:
=over
=item filter
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>
based software.
=item require_params
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.
=back
=head1 METHODS
=head2 new
Create a new filter with the specified arguments.
=cut
sub new {
my $class = shift;
my %args = @_;
return bless { %args }, $class;
}
=head2 require_params
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> notation.
=cut
sub require_params {
return ( );
}
=head2 param
Get the named param. Read only.
=cut
sub param {
my $self = shift;
my $param_name = shift;
return $self->{$param_name};
}
=head2 filter
Stub method. Does nothing, just returns the original tree.
=cut
sub filter {
my $self = shift;
my $pa = shift;
return $pa;
}
=head2 run
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).
=cut
sub run {
my $self = shift;
my $arg = shift;
if( eval { $arg->isa( 'Pod::Abstract::Node' ) } ) {
return $self->filter($arg);
} else {
my $pa = Pod::Abstract->load_string($arg);
return $self->filter($pa);
}
}
=head1 AUTHOR
Ben Lilburne <bnej@mac.com>
=head1 COPYRIGHT AND LICENSE
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.
=cut
1;
|
