Data::Visitor::Callback - A Data::Visitor with callbacks.

NAME

Data::Visitor::Callback - A Data::Visitor with callbacks.

SYNOPSIS

        use Data::Visitor::Callback;
        my $v = Data::Visitor::Callback->new(
                value => sub { ... },
                array => sub { ... },
        );
        $v->visit( $some_perl_value );

DESCRIPTION

This is a the Data::Visitor manpage subclass that lets you invoke callbacks instead of needing to subclass yourself.

METHODS

new %opts, %callbacks
Construct a new visitor.

The options supported are:

ignore_return_values
When this is true (off by default) the return values from the callbacks are ignored, thus disabling the fmapping behavior as documented in the Data::Visitor manpage.

This is useful when you want to modify $_ directly

CALLBACKS

Use these keys for the corresponding callbacks.

The callback is in the form:

        sub {
                my ( $visitor, $data ) = @_;
                # or you can use $_, it's aliased
                return $data; # or modified data
        }

Within the callback $_ is aliased to the data, and this is also passed in the parameter list.

visit
Called for all values

value
Called for non objects, non container (hash, array, glob or scalar ref) values.

ref_value
Called after value, for references to regexes, globs and code.

plain_value
Called after value for non references.

object
Called for blessed objects.

array
Called for array references.

hash
Called for hash references.

glob
Called for glob references.

scalar
Called for scalar references.

AUTHOR

Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT & LICENSE

        Copyright (c) 2006 Yuval Kogman. All rights reserved
        This program is free software; you can redistribute
        it and/or modify it under the same terms as Perl itself.
 Data::Visitor::Callback - A Data::Visitor with callbacks.