Class::Forward (3pm)

version 0.100006

    use Class::Forward;

    # create a resolution object
    my $res = Class::Forward->new(namespace => 'MyApp');

    # returns MyApp::Data
    say $res->forward('data');

    # returns a MyApp::Data instance
    my $data  = $res->forward('data.new');

    # returns the string /my_app/data
    my $string = $res->reverse('data.new');

    # returns MyApp::Data
    say $res->forward($string);

Class::Forward is designed to resolve Perl namespaces from shorthand (which is simply a file-path-like specification). Class::Forward can also be used to dispatch method calls using said shorthand. See the following exported functions for examples on how this can be used.

clsf

The exported function clsf is responsible for resolving your shorthand. The following is an example of how it functions:

package App::Store;

use CGI; use Class::Forward;

clsf; # returns App::Store clsf './user'; # returns App::Store::User clsf './user.new', name => 'N30'; # return a new App::Store::User object clsf './user_profile.new'; # ... App::Store::UserProfile object clsf '../user'; # returns App::User clsf '//'; # returns App; (top of the calling class) clsf '//.new'; # returns a new App object clsf '//view'; # ... returns App::View clsf '//view.new'; # ... returns a new App::View object clsf '//view.new.render'; # ... dispatches methods in succession clsf 'cgi'; # returns App::Store::Cgi clsf '/cgi'; # returns Cgi (or CGI if already loaded)

1;

The clsf function takes two arguments, the shorthand to be translated, and an optional list of arguments to be passed to the last method appended to the shorthand.

clsr

The exported function clsr is responsible for resolving your shorthand. The following is an example of how it functions:

package App::Store;

use CGI; use Class::Forward;

clsr; # returns /app/store clsr './user'; # returns /app/store/user clsr './user.new', name => 'N30'; # returns /app/store/user clsr './user_profile'; # returns /app/store/user_profile clsr '../user'; # returns /app/user clsr '//'; # returns /app clsr '//.new'; # returns /app clsr '//view'; # returns /app/view clsr '//view.new'; # returns /app/view clsr '//view.new.render'; # returns /app/view clsr 'cgi'; # returns /app/store/cgi clsr '/cgi'; # returns /cgi

1;

The clsr function takes three arguments, the shorthand to be translated (required), the offset (optional level of namespace nodes to omit left-to-right), and the delimiter to be used to generate the resulting path (defaults to forward-slash).

new

The new method is used to instantiate a new instance.

namespace

The namespace method is used to get/set the root namespace used as an anchor for all resolution requests.

my $namespace = $self->namespace('MyApp');

forward

The forward (or forward_lookup) method is used to resolve Perl namespaces from path-like shorthand.

say $self->forward('example'); # given a default namespace of MyApp # prints MyApp::Example

reverse

The reverse method (or reverse_lookup) is used to generate path-like shorthand from Perl namespaces.

say $self->reverse('Simple::Example'); # given a default namespace of MyApp # prints /my_app/simple/example

say $self->reverse('Simple::Example', 1); # given a default namespace of MyApp # prints simple/example

say $self->reverse('Simple::Example', 1, '_'); # given a default namespace of MyApp # prints simple_example

Class::Forward was designed to provide shorthand and easy access to class namespaces in an environment where you're dealing with a multitude of long well-named classes. In that vein, it provides an alternative to modules like aliased, aliased::factory, as, and the like, and also modules like Namespace::Dispatch which are similar enough to be mentioned but really address a completely different issue.

Al Newkirk <[email protected]>

This software is copyright (c) 2012 by Al Newkirk.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.