https://github.com/awncorp/data-object-attributes
Attribute Builder for Perl 5
https://github.com/awncorp/data-object-attributes
object-oriented perl perl5
Last synced: 1 day ago
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Attribute Builder for Perl 5
- Host: GitHub
- URL: https://github.com/awncorp/data-object-attributes
- Owner: awncorp
- License: other
- Created: 2020-10-03T19:04:21.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-10-03T20:33:28.000Z (over 5 years ago)
- Last Synced: 2025-01-01T11:27:39.517Z (over 1 year ago)
- Topics: object-oriented, perl, perl5
- Language: Perl
- Size: 39.1 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README
- Changelog: CHANGES
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
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README
NAME
Data::Object::Attributes
ABSTRACT
Attribute Builder for Perl 5
SYNOPSIS
package Example;
use Moo;
use Data::Object::Attributes;
has 'data';
package main;
my $example = Example->new;
DESCRIPTION
This package provides options for defining class attributes.
Specifically, this package wraps the has attribute keyword and adds
shortcuts and enhancements. If no directives are specified, the
attribute is declared as read-write and optional.
SCENARIOS
This package supports the following scenarios:
has
package Example::Has;
use Moo;
has 'data' => (
is => 'ro',
isa => sub { die }
);
package Example::HasData;
use Moo;
use Data::Object::Attributes;
extends 'Example::Has';
has '+data' => (
is => 'ro',
isa => sub { 1 }
);
package main;
my $example = Example::HasData->new(data => time);
This package supports the has keyword function and all of its
configurations. See the Moo documentation for more details.
has-bld
package Example::HasBld;
use Moo;
use routines;
use Data::Object::Attributes;
has data => (
is => 'ro',
bld => 1
);
method _build_data() {
return time;
}
package main;
my $example = Example::HasBld->new;
This package supports the bld and builder directives, expects a 1, a
method name, or coderef and builds the attribute value if it wasn't
provided to the constructor. See the Moo documentation for more
details.
has-clr
package Example::HasClr;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
clr => 1
);
package main;
my $example = Example::HasClr->new(data => time);
# $example->clear_data;
This package supports the clr and clearer directives expects a 1 or a
method name of the clearer method. See the Moo documentation for more
details.
has-crc
package Example::HasCrc;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
crc => sub {'0'}
);
package main;
my $example = Example::HasCrc->new(data => time);
This package supports the crc and coerce directives denotes whether an
attribute's value should be automatically coerced. See the Moo
documentation for more details.
has-def
package Example::HasDef;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
def => '0'
);
package main;
my $example = Example::HasDef->new;
This package supports the def and default directives expects a
non-reference or a coderef to be used to build a default value if one
is not provided to the constructor. See the Moo documentation for more
details.
has-hnd
package Example::Time;
use Moo;
use routines;
method maketime() {
return time;
}
package Example::HasHnd;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
hnd => ['maketime']
);
package main;
my $example = Example::HasHnd->new(data => Example::Time->new);
This package supports the hnd and handles directives denotes the
methods created on the object which dispatch to methods available on
the attribute's object. See the Moo documentation for more details.
has-is
package Example::HasIs;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro'
);
package main;
my $example = Example::HasIs->new(data => time);
This package supports the is directive, used to denote whether the
attribute is read-only or read-write. See the Moo documentation for
more details.
has-isa
package Example::HasIsa;
use Moo;
use registry;
use Data::Object::Attributes;
has data => (
is => 'ro',
isa => 'Str' # e.g. Types::Standard::Str
);
package main;
my $example = Example::HasIsa->new(data => time);
This package supports the isa directive, used to define the type
constraint to validate the attribute against. See the Moo documentation
for more details.
has-lzy
package Example::HasLzy;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
def => sub {time},
lzy => 1
);
package main;
my $example = Example::HasLzy->new;
This package supports the lzy and lazy directives denotes whether the
attribute will be constructed on-demand, or on-construction. See the
Moo documentation for more details.
has-mod
package Example::HasNomod;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'rw',
opt => 1
);
package Example::HasMod;
use Moo;
use Data::Object::Attributes;
extends 'Example::HasNomod';
has data => (
is => 'ro',
req => 1,
mod => 1
);
package main;
my $example = Example::HasMod->new;
This package supports the mod and modify directives denotes whether a
pre-existing attribute's definition is being modified. This ability is
not supported by the Moo object superclass.
has-new
package Example::HasNew;
use Moo;
use routines;
use Data::Object::Attributes;
has data => (
is => 'ro',
new => 1
);
fun new_data($self) {
return time;
}
package main;
my $example = Example::HasNew->new(data => time);
This package supports the new directive, if truthy, denotes that the
attribute will be constructed on-demand, i.e. is lazy, with a builder
named new_{attribute}. This ability is not supported by the Moo object
superclass.
has-opt
package Example::HasOpt;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
opt => 1
);
package main;
my $example = Example::HasOpt->new(data => time);
This package supports the opt and optional directives, used to denote
if an attribute is optional or required. See the Moo documentation for
more details.
has-pre
package Example::HasPre;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
pre => 1
);
package main;
my $example = Example::HasPre->new(data => time);
This package supports the pre and predicate directives expects a 1 or a
method name and generates a method for checking the existance of the
attribute. See the Moo documentation for more details.
has-rdr
package Example::HasRdr;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
rdr => 'get_data'
);
package main;
my $example = Example::HasRdr->new(data => time);
This package supports the rdr and reader directives denotes the name of
the method to be used to "read" and return the attribute's value. See
the Moo documentation for more details.
has-req
package Example::HasReq;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
req => 1 # required
);
package main;
my $example = Example::HasReq->new(data => time);
This package supports the req and required directives, used to denote
if an attribute is required or optional. See the Moo documentation for
more details.
has-tgr
package Example::HasTgr;
use Moo;
use routines;
use Data::Object::Attributes;
has data => (
is => 'ro',
tgr => 1
);
method _trigger_data() {
$self->{triggered} = 1;
return $self;
}
package main;
my $example = Example::HasTgr->new(data => time);
This package supports the tgr and trigger directives expects a 1 or a
coderef and is executed whenever the attribute's value is changed. See
the Moo documentation for more details.
has-use
package Example::HasUse;
use Moo;
use routines;
use Data::Object::Attributes;
has data => (
is => 'ro',
use => ['service', 'time']
);
method service($type, @args) {
$self->{serviced} = 1;
return time if $type eq 'time';
}
package main;
my $example = Example::HasUse->new;
This package supports the use directive denotes that the attribute will
be constructed on-demand, i.e. is lazy, using a custom builder meant to
perform service construction. This directive exists to provide a simple
dependency injection mechanism for class attributes. This ability is
not supported by the Moo object superclass.
has-wkr
package Example::HasWkr;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
wkr => 1
);
package main;
my $data = do {
my ($a, $b);
$a = { time => time };
$b = { time => $a };
$a->{time} = $b;
$a
};
my $example = Example::HasWkr->new(data => $data);
This package supports the wkr and weak_ref directives is used to denote
if the attribute's value should be weakened. See the Moo documentation
for more details.
has-wrt
package Example::HasWrt;
use Moo;
use Data::Object::Attributes;
has data => (
is => 'ro',
wrt => 'set_data'
);
package main;
my $example = Example::HasWrt->new;
This package supports the wrt and writer directives denotes the name of
the method to be used to "write" and return the attribute's value. See
the Moo documentation for more details.
AUTHOR
Al Newkirk, awncorp@cpan.org
LICENSE
Copyright (C) 2011-2019, Al Newkirk, et al.
This is free software; you can redistribute it and/or modify it under
the terms of the The Apache License, Version 2.0, as elucidated in the
"license file"
.
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