NAME

Moose::Util - Utilities for working with Moose classes

SYNOPSIS

  use Moose::Util qw/find_meta does_role search_class_by_role/;

  my $meta = find_meta($object) || die "No metaclass found";

  if (does_role($object, $role)) {
    print "The object can do $role!\n";
  }

  my $class = search_class_by_role($object, 'FooRole');
  print "Nearest class with 'FooRole' is $class\n";

DESCRIPTION

This module provides a set of utility functions. Many of these functions are intended for use in Moose itself or MooseX modules, but some of them may be useful for use in your own code.

EXPORTED FUNCTIONS

find_meta($class_or_obj)

This method takes a class name or object and attempts to find a metaclass for the class, if one exists. It will not create one if it does not yet exist.

does_role($class_or_obj, $role_name)

Returns true if $class_or_obj does the given $role_name.

The class must already have a metaclass for this to work.

search_class_by_role($class_or_obj, $role_name)

Returns the first class in the class's precedence list that does $role_name, if any.

The class must already have a metaclass for this to work.

apply_all_roles($applicant, @roles)

This function applies one or more roles to the given $applicant The applicant can be a role name, class name, or object.

The $applicant must already have a metaclass object.

The list of @roles should be a list of names, each of which can be followed by an optional hash reference of options (exclude and alias).

ensure_all_roles($applicant, @roles)

This function is similar to "apply_all_roles", but only applies roles that $applicant does not already consume.

get_all_attribute_values($meta, $instance)

Returns a hash reference containing all of the $instance's attributes. The keys are attribute names.

get_all_init_args($meta, $instance)

Returns a hash reference containing all of the init_arg values for the instance's attributes. The values are the associated attribute values. If an attribute does not have a defined init_arg, it is skipped.

This could be useful in cloning an object.

resolve_metaclass_alias($category, $name, %options)

resolve_metatrait_alias($category, $name, %options)

Resolves a short name to a full class name. Short names are often used when specifying the metaclass or traits option for an attribute:

    has foo => (
        metaclass => "Bar",
    );

The name resolution mechanism is covered in "Trait Name Resolution" in Moose.

english_list(@items)

Given a list of scalars, turns them into a proper list in English ("one and two", "one, two, three, and four"). This is used to help us make nicer error messages.

TODO

Here is a list of possible functions to write

discovering original method from modified method

search for origin class of a method or attribute

BUGS

All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT.

AUTHOR

Anders Nor Berle <debolaz@gmail.com>

with contributions from:

Robert (phaylon) Sedlacek

Stevan Little

COPYRIGHT AND LICENSE

Copyright 2007-2009 by Infinity Interactive, Inc.

http://www.iinteractive.com

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