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use 5.008;
use strict;
use warnings;
package Sub::HandlesVia::Declare;
our $AUTHORITY = 'cpan:TOBYINK';
our $VERSION = '0.052000';
use Sub::HandlesVia ();
my %cache;
sub import {
my ( $class, $attr ) = ( shift, shift );
my ( $via, %delegations ) = ( @_ % 2 ) ? @_ : ( undef, @_ );
if ( not defined $via ) {
$via = 'Array' if $attr =~ /^@/;
$via = 'Hash' if $attr =~ /^%/;
if ( not defined $via ) {
require Sub::HandlesVia::Mite;
Sub::HandlesVia::Mite::croak(
'Expected usage: '.
'use Sub::HandlesVia::Declare ( $attr, $via, %delegations );'
);
}
}
my $caller = caller;
if ( not $cache{$caller} ) {
'Sub::HandlesVia'->import(
{
into => $caller,
installer => sub { $cache{$caller} = $_[1][1] },
},
qw( delegations ),
);
}
$cache{$caller}->(
attribute => $attr,
handles_via => $via,
handles => \%delegations,
);
}
1;
__END__
=pod
=encoding utf-8
=head1 NAME
Sub::HandlesVia::Declare - declare delegations at compile-time
=head1 SYNOPSIS
use Sub::HandlesVia::Declare( $attr, $via => %delegations );
This is roughly equivalent to the following:
use Sub::HandlesVia qw(delegations);
BEGIN {
delegations(
attribute => $attr,
handles_via => $via,
handles => \%delegations,
);
};
Except it doesn't import the C<delegations> function into your namespace.
=head1 DESCRIPTION
Useful for L<Object::Pad> and kind of nice for L<Class::Tiny>. Basically
any class builder than does its stuff at compile time.
=head2 Object::Pad
use Object::Pad;
class Kitchen {
has @foods;
use Sub::HandlesVia::Declare '@foods', Array => (
all_foods => 'all',
add_food => 'push',
);
}
If an attribute begins with a '@' or '%', C<< $via >> can be omitted.
use Object::Pad;
class Kitchen {
has @foods;
use Sub::HandlesVia::Declare '@foods', (
all_foods => 'all',
add_food => 'push',
);
}
=head2 Class::Tiny
package Kitchen;
use Class::Tiny {
foods => sub { [] },
drinks => sub { [ 'water' ] },
};
use Sub::HandlesVia::Declare 'foods', Array => (
all_foods => 'all',
add_food => 'push',
);
use Sub::HandlesVia::Declare 'drinks', Array => (
all_drinks => 'all',
add_drink => 'push',
);
=head1 BUGS
Please report any bugs to
L<https://github.com/tobyink/p5-sub-handlesvia/issues>.
=head1 SEE ALSO
L<Sub::HandlesVia>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2022 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=head1 DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
