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1 | package ## Hide from PAUSE |
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2 | MooseX::Dependent::Meta::TypeCoercion::Dependent; |
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3 | |
4 | use Moose; |
5 | extends 'Moose::Meta::TypeCoercion'; |
6 | |
7 | =head1 NAME |
8 | |
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9 | MooseX::Meta::TypeCoercion::Dependent - Coerce Dependent type constraints. |
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10 | |
11 | =head1 DESCRIPTION |
12 | |
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13 | This class is not intended for public consumption. Please don't subclass it |
14 | or rely on it. Chances are high stuff here is going to change a lot. |
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15 | |
16 | =head1 METHODS |
17 | |
18 | This class defines the following methods. |
19 | |
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20 | =head add_type_coercions |
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21 | |
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22 | method modification to throw exception should we try to add a coercion on a |
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23 | dependent type that is already defined by a constraining value. We do this |
24 | since defined dependent type constraints inherit their coercion from the parent |
25 | constraint. It makes no sense to even be using dependent types if you know the |
26 | constraining value beforehand! |
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27 | |
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28 | =cut |
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29 | |
30 | around 'add_type_coercions' => sub { |
31 | my ($add_type_coercions, $self, @args) = @_; |
32 | if($self->type_constraint->has_constraining_value) { |
33 | Moose->throw_error("Cannot add type coercions to a dependent type constraint that's been defined."); |
34 | } else { |
35 | return $self->$add_type_coercions(@args); |
36 | } |
37 | }; |
38 | |
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39 | |
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40 | ## These two are here until I can merge change upstream to Moose. These are two |
41 | ## very minor changes we can probably just put into Moose without breaking stuff |
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42 | sub coerce { |
43 | my $self = shift @_; |
44 | my $coderef = $self->_compiled_type_coercion; |
45 | return $coderef->(@_); |
46 | } |
47 | |
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48 | sub compile_type_coercion { |
49 | my $self = shift; |
50 | my @coercion_map = @{$self->type_coercion_map}; |
51 | my @coercions; |
52 | while (@coercion_map) { |
53 | my ($constraint_name, $action) = splice(@coercion_map, 0, 2); |
54 | my $type_constraint = ref $constraint_name ? $constraint_name : Moose::Util::TypeConstraints::find_or_parse_type_constraint($constraint_name); |
55 | |
56 | unless ( defined $type_constraint ) { |
57 | require Moose; |
58 | Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from"); |
59 | } |
60 | |
61 | push @coercions => [ |
62 | $type_constraint->_compiled_type_constraint, |
63 | $action |
64 | ]; |
65 | } |
66 | $self->_compiled_type_coercion(sub { |
67 | my $thing = shift; |
68 | foreach my $coercion (@coercions) { |
69 | my ($constraint, $converter) = @$coercion; |
70 | if ($constraint->($thing)) { |
71 | local $_ = $thing; |
72 | return $converter->($thing, @_); |
73 | } |
74 | } |
75 | return $thing; |
76 | }); |
77 | } |
78 | |
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79 | =head1 SEE ALSO |
80 | |
81 | The following modules or resources may be of interest. |
82 | |
83 | L<Moose>, L<Moose::Meta::TypeCoercion> |
84 | |
85 | =head1 AUTHOR |
86 | |
87 | John Napiorkowski, C<< <jjnapiork@cpan.org> >> |
88 | |
89 | =head1 COPYRIGHT & LICENSE |
90 | |
91 | This program is free software; you can redistribute it and/or modify |
92 | it under the same terms as Perl itself. |
93 | |
94 | =cut |
95 | |
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96 | __PACKAGE__->meta->make_immutable(inline_constructor => 0); |