MooX::VariantAttribute - a щ（ﾟДﾟщ）Attribute...
Version 0.11
package Backwards::World; use Moo; use MooX::VariantAttribute; use Type::Standards qw/Object Str/; variant parser => ( given => Object, when => [ 'Test::Parser::One' => { alias => { parse_string => 'parse', # parse_file exists }, }, 'Random::Parser::Two' => { alias => { # parse_string exists parse_file => 'parse_from_file', }, }, 'Another::Parser::Three' => { alias => { parse_string => 'meth_one', parse_file => 'meth_two', }, }, ], ); variant string => ( given => Str, when => [ 'one' => { run => sub { return "$_[2] - cold, cold, cold inside" }, }, 'two' => { run => sub { return "$_[2] - don't look at me that way"; }, }, 'three' => { run => sub { return "$_[2] - how hard will i fall if I live a double life"; }, }, ], ); variant refs => ( given => sub { ref $_[1] or ref \$_[1] }, when => [ 'SCALAR' => { run => sub { return sprintf "refs returned - %s - %s", $_[1], $_[2]; }, }, 'HASH' => { run => sub { return sprintf "refs returned - %s - %s", $_[1], (join(',', map { sprintf '%s=>%s', $_, $_[2]->{$_} } keys %{ $_[2] })); }, }, 'ARRAY' => { run => sub { return sprintf "refs returned - %s - %s", $_[1], join(',', @{ $_[2] }) }, }, ], );
"I'm just a attribute with a trigger", when you...
use MooX::VariantAttribute;
Magically a role is added..
with 'MooX::VariantAttribute::Role';
MooX::VariantAttribute::Role is a Moo::Role that contains the variant attributes *trigger* logic.
Multiple variant attributes can be declared, they are read in as a list. Each will be transformed into a Moo Attribute with a trigger.
variant 'one' => ( given => Str, when => [ one => { run => sub { return 'one' } }, ], ); ..... has one => ( is => 'rw', trigger => sub { return $_[0]->_given_when($_[1], $spec{given}, $spec{when}, $name); } );
These attributes have to be read-write as the trigger is used to set the final *stored* value.
The Variants should always have two key/value pairs, given and when, given accepts a code reference or Type::Tiny object. When the code reference is called two parameters are passed, the first $self and the second the $new value. Type::Tiny objects are called with just the $new value.
given => sub { my $self = shift; ref $_[0] },
*when* should always be an array reference of pairs. The first value is the *matching* value it can be an SCALAR, ARRAY, HASH maybe even an Object. The second value has to be an hash reference with two optional keys run and alias. *run* can either be a code reference or a scalar that references a sub routine available to $self, bot will be passed $self, the $value returned from given and the $new passed value.
package Backwards::World; use Moo; use MooX::VariantAttribute; use Types::Standard qw/Any/; variant hello => ( given => Any, when => [ { one => 'two' } => { run => sub { return keys %{ $_[2] } }, }, { three => 'four' } => { run => sub { return values %{ $_[2] } }, }, [ qw/five six/ ] => { run => sub { return $_[2]->[1] }, }, seven => { run => 'seven', } ], ); sub seven { return $_[0]->hello({ one => 'two' }); } .... my $object = Backwards::World->new( hello => 'one' ); $object->hello # one; $object->hello({ three => 'four' }); # four; $object->hello, # four; $object->hello([ qw/five six/ ]), # six; $object->hello, # six; $object->hello('seven'), # one; $object->hello, # one;
Accepts an code reference.
given => sub { my $self = shift; return $_[0] },
Accepts an array reference.
when => [ one => { run => sub { return 'Hey' } }, ],
Accepts any kind of reference, object or scalar.
default => sub { one => two }, default => { one => two },
Accepts a scalar, set 1 for the default (_build_$name).
builder => 1, builder => '_build_hello',
Accepts a scalar.
predicate => 'has_hello',
Accepts a scalar, set 1 for the default (clear_$name).
clearer => 1,
Accepts a Boolean, Set this if the attribute must be passed on object instantiation.
required => 1,
reader => 'get_hello',
writer => 'set_hello',
Robert Acock, <thisusedtobeanemail at gmail.com>
<thisusedtobeanemail at gmail.com>
Please report any bugs or feature requests to bug-moox-variantattribute at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=MooX-VariantAttribute. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
bug-moox-variantattribute at rt.cpan.org
You can find documentation for this module with the perldoc command.
perldoc MooX::VariantAttribute
You can also look for information at:
RT: CPAN's request tracker (report bugs here)
http://rt.cpan.org/NoAuth/Bugs.html?Dist=MooX-VariantAttribute
AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/MooX-VariantAttribute
CPAN Ratings
http://cpanratings.perl.org/d/MooX-VariantAttribute
Search CPAN
http://search.cpan.org/dist/MooX-VariantAttribute/
Copyright 2017 Robert Acock.
This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:
http://www.perlfoundation.org/artistic_license_2_0
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To install MooX::VariantAttribute, copy and paste the appropriate command in to your terminal.
cpanm
cpanm MooX::VariantAttribute
CPAN shell
perl -MCPAN -e shell install MooX::VariantAttribute
For more information on module installation, please visit the detailed CPAN module installation guide.