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1 | |
2 | package Moose::Meta::TypeConstraint::Intersection; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
8 | use Moose::Meta::TypeCoercion::Intersection; |
9 | |
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10 | use List::Util qw(first); |
11 | use List::MoreUtils qw(all); |
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12 | |
13 | use base 'Moose::Meta::TypeConstraint'; |
14 | |
15 | __PACKAGE__->meta->add_attribute('type_constraints' => ( |
16 | accessor => 'type_constraints', |
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17 | default => sub { [] }, |
18 | Class::MOP::_definition_context(), |
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19 | )); |
20 | |
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21 | sub new { |
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22 | my ($class, %options) = @_; |
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23 | |
24 | my $name = join '&' => sort {$a cmp $b} |
25 | map { $_->name } @{$options{type_constraints}}; |
26 | |
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27 | my $self = $class->SUPER::new( |
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28 | name => $name, |
29 | %options, |
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30 | ); |
31 | $self->_set_constraint(sub { $self->check($_[0]) }); |
32 | $self->coercion(Moose::Meta::TypeCoercion::Intersection->new( |
33 | type_constraint => $self |
34 | )); |
35 | return $self; |
36 | } |
37 | |
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38 | sub _actually_compile_type_constraint { |
39 | my $self = shift; |
40 | |
41 | my @constraints = @{ $self->type_constraints }; |
42 | |
43 | return sub { |
44 | my $value = shift; |
45 | my $count = 0; |
46 | foreach my $type (@constraints){ |
47 | $count++ if $type->check($value); |
48 | } |
49 | return $count==scalar @constraints ? 1: undef; |
50 | }; |
51 | } |
52 | |
53 | sub can_be_inlined { |
54 | my $self = shift; |
55 | for my $tc ( @{ $self->type_constraints }) { |
56 | return 0 unless $tc->can_be_inlined; |
57 | } |
58 | return 1; |
59 | } |
60 | |
61 | sub _inline_check { |
62 | my $self = shift; |
63 | my $val = shift; |
64 | return '(' . |
65 | ( |
66 | join ' && ' , map { '(' . $_->_inline_check($val) . ')' } @{ $self->type_constraints } |
67 | ) . ')'; |
68 | } |
69 | |
70 | sub inline_environment { |
71 | my $self = shift; |
72 | |
73 | return { map { %{ $_->inline_environment } } @{ $self->type_constraints } }; |
74 | } |
75 | |
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76 | sub equals { |
77 | my ( $self, $type_or_name ) = @_; |
78 | |
79 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
80 | |
81 | return unless $other->isa(__PACKAGE__); |
82 | |
83 | my @self_constraints = @{ $self->type_constraints }; |
84 | my @other_constraints = @{ $other->type_constraints }; |
85 | |
86 | return unless @self_constraints == @other_constraints; |
87 | |
88 | # FIXME presort type constraints for efficiency? |
89 | constraint: foreach my $constraint ( @self_constraints ) { |
90 | for ( my $i = 0; $i < @other_constraints; $i++ ) { |
91 | if ( $constraint->equals($other_constraints[$i]) ) { |
92 | splice @other_constraints, $i, 1; |
93 | next constraint; |
94 | } |
95 | } |
96 | } |
97 | |
98 | return @other_constraints == 0; |
99 | } |
100 | |
101 | sub parents { |
102 | my $self = shift; |
103 | $self->type_constraints; |
104 | } |
105 | |
106 | sub validate { |
107 | my ($self, $value) = @_; |
108 | my $message; |
109 | foreach my $type (@{$self->type_constraints}) { |
110 | my $err = $type->validate($value); |
111 | return unless defined $err; |
112 | $message .= ($message ? ' and ' : '') . $err |
113 | if defined $err; |
114 | } |
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115 | return ($message . ' in (' . $self->name . ')') ; |
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116 | } |
117 | |
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118 | sub find_type_for { |
119 | my ($self, $value) = @_; |
120 | return first { $_->check($value) } @{ $self->type_constraints }; |
121 | } |
122 | |
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123 | sub is_a_type_of { |
124 | my ($self, $type_name) = @_; |
125 | foreach my $type (@{$self->type_constraints}) { |
126 | return 1 if $type->is_a_type_of($type_name); |
127 | } |
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128 | return 0; |
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129 | } |
130 | |
131 | sub is_subtype_of { |
132 | my ($self, $type_name) = @_; |
133 | foreach my $type (@{$self->type_constraints}) { |
134 | return 1 if $type->is_subtype_of($type_name); |
135 | } |
136 | return 0; |
137 | } |
138 | |
139 | sub create_child_type { |
140 | my ( $self, %opts ) = @_; |
141 | |
142 | my $constraint |
143 | = Moose::Meta::TypeConstraint->new( %opts, parent => $self ); |
144 | |
145 | # if we have a type constraint intersection, and no |
146 | # type check, this means we are just aliasing |
147 | # the intersection constraint, which means we need to |
148 | # handle this differently. |
149 | # - SL |
150 | if ( not( defined $opts{constraint} ) |
151 | && $self->has_coercion ) { |
152 | $constraint->coercion( |
153 | Moose::Meta::TypeCoercion::Intersection->new( |
154 | type_constraint => $self, |
155 | ) |
156 | ); |
157 | } |
158 | |
159 | return $constraint; |
160 | } |
161 | |
162 | 1; |
163 | |
164 | __END__ |
165 | |
166 | =pod |
167 | |
168 | =head1 NAME |
169 | |
170 | Moose::Meta::TypeConstraint::Intersection - An intersection of Moose type constraints |
171 | |
172 | =head1 DESCRIPTION |
173 | |
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174 | This metaclass represents an intersection of Moose type constraints. More |
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175 | details to be explained later (possibly in a Cookbook recipe). |
176 | |
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177 | This actually used to be part of Moose::Meta::TypeConstraint, but it |
178 | is now better off in it's own file. |
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179 | |
180 | =head1 METHODS |
181 | |
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182 | This class is not a subclass of Moose::Meta::TypeConstraint, |
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183 | but it does provide the same API |
184 | |
185 | =over 4 |
186 | |
187 | =item B<meta> |
188 | |
189 | =item B<new> |
190 | |
191 | =item B<name> |
192 | |
193 | =item B<type_constraints> |
194 | |
195 | =item B<parents> |
196 | |
197 | =item B<constraint> |
198 | |
199 | =item B<includes_type> |
200 | |
201 | =item B<equals> |
202 | |
203 | =back |
204 | |
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205 | =head2 Overridden methods |
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206 | |
207 | =over 4 |
208 | |
209 | =item B<check> |
210 | |
211 | =item B<coerce> |
212 | |
213 | =item B<validate> |
214 | |
215 | =item B<is_a_type_of> |
216 | |
217 | =item B<is_subtype_of> |
218 | |
219 | =back |
220 | |
221 | =head2 Empty or Stub methods |
222 | |
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223 | These methods tend to not be very relevant in |
224 | the context of an intersection. Either that or they are |
225 | just difficult to specify and not very useful |
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226 | anyway. They are here for completeness. |
227 | |
228 | =over 4 |
229 | |
230 | =item B<parent> |
231 | |
232 | =item B<coercion> |
233 | |
234 | =item B<has_coercion> |
235 | |
236 | =item B<message> |
237 | |
238 | =item B<has_message> |
239 | |
240 | =item B<hand_optimized_type_constraint> |
241 | |
242 | =item B<has_hand_optimized_type_constraint> |
243 | |
244 | =item B<create_child_type> |
245 | |
246 | =back |
247 | |
248 | =head1 BUGS |
249 | |
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250 | All complex software has bugs lurking in it, and this module is no |
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251 | exception. If you find a bug please either email me, or add the bug |
252 | to cpan-RT. |
253 | |
254 | =head1 AUTHOR |
255 | |
256 | Stevan Little E<lt>stevan@iinteractive.comE<gt> and |
257 | Adam Foxson E<lt>afoxson@pobox.comE<gt> |
258 | |
259 | =head1 COPYRIGHT AND LICENSE |
260 | |
261 | Copyright 2006-2009 by Infinity Interactive, Inc. |
262 | |
263 | L<http://www.iinteractive.com> |
264 | |
265 | This library is free software; you can redistribute it and/or modify |
266 | it under the same terms as Perl itself. |
267 | |
268 | =cut |