NAME

UNIVERSAL::AUTHORITY::Lexical - an AUTHORITY method for every class, within a lexical scope

SYNOPSIS

 if (HTML::HTML5::Writer->AUTHORITY ne HTML::HTML5::Builder->AUTHORITY)
 {
   warn "Closely intertwined modules with different authors!\n";
   warn "There may be trouble ahead...";
 }

 # Only trust STEVAN's releases
 Moose->AUTHORITY('cpan:STEVAN'); # dies if doesn't match

DESCRIPTION

This module adds an AUTHORITY method to the UNIVERSAL package, which works along the same lines as the VERSION function. Because it is defined in UNIVERSAL, it becomes instantly available as a method for any blessed objects, and as a class method for any package.

The method is defined only for the lexical scope you import this package into. For example:

  {
    use UNIVERSAL::AUTHORITY::Lexical;
    say Moose->AUTHORITY;
  }
  say Moose->AUTHORITY;  # no such method, dies.

The authority of a package can be defined like this:

 package MyApp;
 BEGIN { $MyApp::AUTHORITY = 'cpan:JOEBLOGGS'; }

The authority should be a URI identifying the person, team, organisation or trained chimp responsible for the release of the package. The pseudo-URI scheme cpan: is the most commonly used identifier.

AUTHORITY

Called with no parameters returns the authority of a CPAN release.

AUTHORITY($test)

If passed a test, will croak if the test fails. The authority is tested against the test using something approximating Perl 5.10's smart match operator. (Briefly, you can pass a string for eq comparison, a regular expression, a code reference to use as a callback, or an array reference that will be grepped.)

BUGS

Currently UNIVERSAL->can('AUTHORITY') returns false.

Please report any bugs to http://rt.cpan.org/Dist/Display.html?Queue=UNIVERSAL-AUTHORITY-Lexical.

SEE ALSO

  • Object::AUTHORITY - an AUTHORITY method for your class

  • authority::shared - a more sophisticated AUTHORITY method for your class

  • UNIVERSAL::AUTHORITY - an AUTHORITY method for every class (deprecated)

  • UNIVERSAL::AUTHORITY::Lexical (this module) - an AUTHORITY method for every class, within a lexical scope

  • authority - load modules only if they have a particular authority

Background reading: http://feather.perl6.nl/syn/S11.html, http://www.perlmonks.org/?node_id=694377.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2011 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.

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.