/usr/lib/perl5/Moose/Meta/TypeCoercion.pm is in libmoose-perl 2.0401-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | package Moose::Meta::TypeCoercion;
BEGIN {
$Moose::Meta::TypeCoercion::AUTHORITY = 'cpan:STEVAN';
}
{
$Moose::Meta::TypeCoercion::VERSION = '2.0401';
}
use strict;
use warnings;
use metaclass;
use Moose::Meta::Attribute;
use Moose::Util::TypeConstraints ();
__PACKAGE__->meta->add_attribute('type_coercion_map' => (
reader => 'type_coercion_map',
default => sub { [] },
Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute(
Moose::Meta::Attribute->new('type_constraint' => (
reader => 'type_constraint',
weak_ref => 1,
Class::MOP::_definition_context(),
))
);
# private accessor
__PACKAGE__->meta->add_attribute('compiled_type_coercion' => (
accessor => '_compiled_type_coercion',
Class::MOP::_definition_context(),
));
sub new {
my $class = shift;
my $self = Class::MOP::class_of($class)->new_object(@_);
$self->compile_type_coercion;
return $self;
}
sub compile_type_coercion {
my $self = shift;
my @coercion_map = @{$self->type_coercion_map};
my @coercions;
while (@coercion_map) {
my ($constraint_name, $action) = splice(@coercion_map, 0, 2);
my $type_constraint = ref $constraint_name ? $constraint_name : Moose::Util::TypeConstraints::find_or_parse_type_constraint($constraint_name);
unless ( defined $type_constraint ) {
require Moose;
Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from");
}
push @coercions => [
$type_constraint->_compiled_type_constraint,
$action
];
}
$self->_compiled_type_coercion(sub {
my $thing = shift;
foreach my $coercion (@coercions) {
my ($constraint, $converter) = @$coercion;
if ($constraint->($thing)) {
local $_ = $thing;
return $converter->($thing);
}
}
return $thing;
});
}
sub has_coercion_for_type {
my ($self, $type_name) = @_;
my %coercion_map = @{$self->type_coercion_map};
exists $coercion_map{$type_name} ? 1 : 0;
}
sub add_type_coercions {
my ($self, @new_coercion_map) = @_;
my $coercion_map = $self->type_coercion_map;
my %has_coercion = @$coercion_map;
while (@new_coercion_map) {
my ($constraint_name, $action) = splice(@new_coercion_map, 0, 2);
if ( exists $has_coercion{$constraint_name} ) {
require Moose;
Moose->throw_error("A coercion action already exists for '$constraint_name'")
}
push @{$coercion_map} => ($constraint_name, $action);
}
# and re-compile ...
$self->compile_type_coercion;
}
sub coerce { $_[0]->_compiled_type_coercion->($_[1]) }
1;
# ABSTRACT: The Moose Type Coercion metaclass
=pod
=head1 NAME
Moose::Meta::TypeCoercion - The Moose Type Coercion metaclass
=head1 VERSION
version 2.0401
=head1 DESCRIPTION
A type coercion object is basically a mapping of one or more type
constraints and the associated coercions subroutines.
It's unlikely that you will need to instantiate an object of this
class directly, as it's part of the deep internals of Moose.
=head1 METHODS
=over 4
=item B<< Moose::Meta::TypeCoercion->new(%options) >>
Creates a new type coercion object, based on the options provided.
=over 8
=item * type_constraint
This is the L<Moose::Meta::TypeConstraint> object for the type that is
being coerced I<to>.
=back
=item B<< $coercion->type_coercion_map >>
This returns the map of type constraints to coercions as an array
reference. The values of the array alternate between type names and
subroutine references which implement the coercion.
The value is an array reference because coercions are tried in the
order they are added.
=item B<< $coercion->type_constraint >>
This returns the L<Moose::Meta::TypeConstraint> that was passed to the
constructor.
=item B<< $coercion->has_coercion_for_type($type_name) >>
Returns true if the coercion can coerce the named type.
=item B<< $coercion->add_type_coercions( $type_name => $sub, ... ) >>
This method takes a list of type names and subroutine references. If
the coercion already has a mapping for a given type, it throws an
exception.
Coercions are actually
=item B<< $coercion->coerce($value) >>
This method takes a value and applies the first valid coercion it
finds.
This means that if the value could belong to more than type in the
coercion object, the first coercion added is used.
=item B<< Moose::Meta::TypeCoercion->meta >>
This will return a L<Class::MOP::Class> instance for this class.
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See L<Moose/CABAL> and L<Moose/CONTRIBUTORS> for details.
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Infinity Interactive, Inc..
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
__END__
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