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65748864 |
1 | package MooseX::Meta::TypeConstraint::Structured; |
2 | |
3 | use 5.8.8; ## Minimum tested Perl Version |
4 | use Moose; |
5 | use Moose::Util::TypeConstraints; |
6 | |
7 | extends 'Moose::Meta::TypeConstraint'; |
8 | |
9 | our $AUTHORITY = 'cpan:JJNAPIORK'; |
10 | |
11 | =head1 NAME |
12 | |
13 | MooseX::Meta::TypeConstraint::Structured - Structured Type Constraints |
14 | |
15 | =head1 VERSION |
16 | |
17 | 0.01 |
18 | |
19 | =cut |
20 | |
21 | our $VERSION = '0.01'; |
22 | |
23 | =head1 DESCRIPTION |
24 | |
25 | Structured type constraints let you assign an internal pattern of type |
26 | constraints to a 'container' constraint. The goal is to make it easier to |
27 | declare constraints like "ArrayRef[Int, Int, Str]" where the constraint is an |
28 | ArrayRef of three elements and the internal constraint on the three is Int, Int |
29 | and Str. |
30 | |
31 | =head1 ATTRIBUTES |
32 | |
33 | This class defines the following attributes. |
34 | |
35 | =head2 parent |
36 | |
37 | additional details on the inherited parent attribute |
38 | |
39 | =head2 signature |
40 | |
41 | This is a signature of internal contraints for the contents of the outer |
42 | contraint container. |
43 | |
44 | =cut |
45 | |
bc64165b |
46 | subtype 'MooseX::Meta::TypeConstraint::Structured::Signature', |
47 | as 'HashRef[Object]', |
48 | where { |
49 | my %signature = %$_; |
50 | foreach my $key (keys %signature) { |
51 | $signature{$key}->isa('Moose::Meta::TypeConstraint'); |
52 | } 1; |
53 | }; |
54 | |
55 | coerce 'MooseX::Meta::TypeConstraint::Structured::Signature', |
56 | from 'ArrayRef[Object]', |
57 | via { |
58 | my @signature = @$_; |
59 | my %hashed_signature = map { $_ => $signature[$_] } 0..$#signature; |
60 | \%hashed_signature; |
61 | }; |
62 | |
65748864 |
63 | has 'signature' => ( |
64 | is=>'ro', |
bc64165b |
65 | isa=>'MooseX::Meta::TypeConstraint::Structured::Signature', |
66 | coerce=>1, |
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67 | required=>1, |
68 | ); |
69 | |
70 | =head1 METHODS |
71 | |
72 | This class defines the following methods. |
73 | |
74 | =head2 _normalize_args |
75 | |
bc64165b |
76 | Get arguments into a known state or die trying. Ideally we try to make this |
77 | into a HashRef so we can match it up with the L</signature> HashRef. |
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78 | |
79 | =cut |
80 | |
81 | sub _normalize_args { |
82 | my ($self, $args) = @_; |
bc64165b |
83 | if(defined $args) { |
84 | if(ref $args eq 'ARRAY') { |
85 | return map { $_ => $args->[$_] } (0..$#$args); |
86 | } elsif (ref $args eq 'HASH') { |
87 | return %$args; |
88 | } else { |
89 | confess 'Signature must be a reference'; |
90 | } |
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91 | } else { |
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92 | confess 'Signature cannot be empty'; |
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93 | } |
94 | } |
95 | |
96 | =head2 constraint |
97 | |
98 | The constraint is basically validating the L</signature> against the incoming |
99 | |
100 | =cut |
101 | |
102 | sub constraint { |
103 | my $self = shift; |
104 | return sub { |
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105 | my %args = $self->_normalize_args(shift); |
106 | foreach my $idx (keys %{$self->signature}) { |
107 | my $type_constraint = $self->signature->{$idx}; |
108 | if(my $error = $type_constraint->validate($args{$idx})) { |
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109 | confess $error; |
110 | } |
111 | } 1; |
112 | }; |
113 | } |
114 | |
bc64165b |
115 | =head2 equals |
116 | |
117 | modifier to make sure equals descends into the L</signature> |
118 | |
119 | =cut |
120 | |
121 | around 'equals' => sub { |
122 | my ($equals, $self, $compared_type_constraint) = @_; |
123 | |
124 | ## Make sure we are comparing typeconstraints of the same base class |
125 | return unless $compared_type_constraint->isa(__PACKAGE__); |
126 | |
127 | ## Make sure the base equals is also good |
128 | return unless $self->$equals($compared_type_constraint); |
129 | |
130 | ## Make sure the signatures match |
131 | return unless $self->signature_equals($compared_type_constraint); |
132 | |
133 | ## If we get this far, the two are equal |
134 | return 1; |
135 | }; |
136 | |
137 | =head2 signature_equals |
138 | |
139 | Check that the signature equals another signature. |
140 | |
141 | =cut |
142 | |
143 | sub signature_equals { |
144 | my ($self, $compared_type_constraint) = @_; |
145 | |
146 | foreach my $idx (keys %{$self->signature}) { |
147 | my $this = $self->signature->{$idx}; |
148 | my $that = $compared_type_constraint->signature->{$idx}; |
149 | return unless $this->equals($that); |
150 | } |
151 | |
152 | return 1; |
153 | } |
154 | |
65748864 |
155 | =head1 AUTHOR |
156 | |
157 | John James Napiorkowski <jjnapiork@cpan.org> |
158 | |
159 | =head1 LICENSE |
160 | |
161 | You may distribute this code under the same terms as Perl itself. |
162 | |
163 | =cut |
164 | |
165 | no Moose; 1; |