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8ee73eeb |
1 | |
2 | package Moose::Meta::TypeConstraint::Union; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
3726f905 |
8 | use Moose::Meta::TypeCoercion::Union; |
9 | |
09532816 |
10 | use List::MoreUtils qw(all); |
1aae641c |
11 | use List::Util qw(first); |
12 | |
d67145ed |
13 | use base 'Moose::Meta::TypeConstraint'; |
14 | |
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15 | __PACKAGE__->meta->add_attribute('type_constraints' => ( |
16 | accessor => 'type_constraints', |
17 | default => sub { [] } |
18 | )); |
19 | |
d03bd989 |
20 | sub new { |
3726f905 |
21 | my ($class, %options) = @_; |
816ef2e2 |
22 | |
23 | my $name = join '|' => sort { $a cmp $b } |
24 | map { $_->name } @{ $options{type_constraints} }; |
25 | |
3726f905 |
26 | my $self = $class->SUPER::new( |
816ef2e2 |
27 | name => $name, |
28 | %options, |
3726f905 |
29 | ); |
816ef2e2 |
30 | |
3726f905 |
31 | $self->_set_constraint(sub { $self->check($_[0]) }); |
4beacd39 |
32 | |
70f676ca |
33 | return $self; |
34 | } |
35 | |
36 | # XXX - this is a rather gross implementation of laziness for the benefit of |
37 | # MX::Types. If we try to call ->has_coercion on the objects during object |
38 | # construction, this does not work when defining a recursive constraint with |
39 | # MX::Types. |
40 | sub coercion { |
41 | my $self = shift; |
42 | |
43 | return $self->{coercion} if exists $self->{coercion}; |
44 | |
5c56b608 |
45 | # Using any instead of grep here causes a weird error with some corner |
46 | # cases when MX::Types is in use. See RT #61001. |
47 | if ( grep { $_->has_coercion } @{ $self->type_constraints } ) { |
70f676ca |
48 | return $self->{coercion} = Moose::Meta::TypeCoercion::Union->new( |
49 | type_constraint => $self ); |
50 | } |
51 | else { |
52 | return $self->{coercion} = undef; |
4beacd39 |
53 | } |
70f676ca |
54 | } |
4beacd39 |
55 | |
70f676ca |
56 | sub has_coercion { |
57 | return defined $_[0]->coercion; |
8ee73eeb |
58 | } |
59 | |
816ef2e2 |
60 | sub _actually_compile_type_constraint { |
61 | my $self = shift; |
62 | |
63 | my @constraints = @{ $self->type_constraints }; |
64 | |
65 | return sub { |
66 | my $value = shift; |
67 | foreach my $type (@constraints) { |
68 | return 1 if $type->check($value); |
69 | } |
70 | return undef; |
71 | }; |
72 | } |
73 | |
7c047a36 |
74 | sub can_be_inlined { |
09532816 |
75 | my $self = shift; |
76 | |
7c047a36 |
77 | return all { $_->can_be_inlined } @{ $self->type_constraints }; |
09532816 |
78 | } |
79 | |
80 | sub _inline_check { |
81 | my $self = shift; |
82 | my $val = shift; |
83 | |
84 | return |
85 | join ' || ', map { '(' . $_->_inline_check($val) . ')' } |
86 | @{ $self->type_constraints }; |
87 | }; |
816ef2e2 |
88 | |
ca789903 |
89 | sub inline_environment { |
90 | my $self = shift; |
91 | |
92 | return { map { %{ $_->inline_environment } } |
93 | @{ $self->type_constraints } }; |
94 | } |
95 | |
dabed765 |
96 | sub equals { |
97 | my ( $self, $type_or_name ) = @_; |
98 | |
99 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
100 | |
101 | return unless $other->isa(__PACKAGE__); |
102 | |
103 | my @self_constraints = @{ $self->type_constraints }; |
104 | my @other_constraints = @{ $other->type_constraints }; |
105 | |
106 | return unless @self_constraints == @other_constraints; |
107 | |
108 | # FIXME presort type constraints for efficiency? |
109 | constraint: foreach my $constraint ( @self_constraints ) { |
110 | for ( my $i = 0; $i < @other_constraints; $i++ ) { |
111 | if ( $constraint->equals($other_constraints[$i]) ) { |
112 | splice @other_constraints, $i, 1; |
113 | next constraint; |
114 | } |
115 | } |
116 | } |
117 | |
118 | return @other_constraints == 0; |
119 | } |
120 | |
121 | sub parents { |
122 | my $self = shift; |
123 | $self->type_constraints; |
124 | } |
125 | |
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126 | sub validate { |
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127 | my ($self, $value) = @_; |
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128 | my $message; |
129 | foreach my $type (@{$self->type_constraints}) { |
130 | my $err = $type->validate($value); |
131 | return unless defined $err; |
132 | $message .= ($message ? ' and ' : '') . $err |
133 | if defined $err; |
134 | } |
d03bd989 |
135 | return ($message . ' in (' . $self->name . ')') ; |
8ee73eeb |
136 | } |
137 | |
1aae641c |
138 | sub find_type_for { |
139 | my ($self, $value) = @_; |
140 | |
141 | return first { $_->check($value) } @{ $self->type_constraints }; |
142 | } |
143 | |
8ee73eeb |
144 | sub is_a_type_of { |
145 | my ($self, $type_name) = @_; |
146 | foreach my $type (@{$self->type_constraints}) { |
147 | return 1 if $type->is_a_type_of($type_name); |
148 | } |
d03bd989 |
149 | return 0; |
8ee73eeb |
150 | } |
151 | |
152 | sub is_subtype_of { |
153 | my ($self, $type_name) = @_; |
154 | foreach my $type (@{$self->type_constraints}) { |
155 | return 1 if $type->is_subtype_of($type_name); |
156 | } |
157 | return 0; |
158 | } |
159 | |
85a9908f |
160 | sub create_child_type { |
622c9332 |
161 | my ( $self, %opts ) = @_; |
162 | |
163 | my $constraint |
164 | = Moose::Meta::TypeConstraint->new( %opts, parent => $self ); |
165 | |
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166 | # if we have a type constraint union, and no |
167 | # type check, this means we are just aliasing |
168 | # the union constraint, which means we need to |
169 | # handle this differently. |
170 | # - SL |
622c9332 |
171 | if ( not( defined $opts{constraint} ) |
172 | && $self->has_coercion ) { |
173 | $constraint->coercion( |
174 | Moose::Meta::TypeCoercion::Union->new( |
175 | type_constraint => $self, |
176 | ) |
177 | ); |
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178 | } |
622c9332 |
179 | |
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180 | return $constraint; |
181 | } |
182 | |
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183 | 1; |
184 | |
ad46f524 |
185 | # ABSTRACT: A union of Moose type constraints |
186 | |
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187 | __END__ |
188 | |
189 | =pod |
190 | |
39b3bc94 |
191 | =head1 DESCRIPTION |
192 | |
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193 | This metaclass represents a union of type constraints. A union takes |
194 | multiple type constraints, and is true if any one of its member |
195 | constraints is true. |
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196 | |
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197 | =head1 INHERITANCE |
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198 | |
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199 | C<Moose::Meta::TypeConstraint::Union> is a subclass of |
200 | L<Moose::Meta::TypeConstraint>. |
ecb59493 |
201 | |
39b3bc94 |
202 | =over 4 |
203 | |
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204 | =item B<< Moose::Meta::TypeConstraint::Union->new(%options) >> |
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205 | |
ae2f99ea |
206 | This creates a new class type constraint based on the given |
207 | C<%options>. |
1b58cb9f |
208 | |
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209 | It takes the same options as its parent. It also requires an |
210 | additional option, C<type_constraints>. This is an array reference |
211 | containing the L<Moose::Meta::TypeConstraint> objects that are the |
212 | members of the union type. The C<name> option defaults to the names |
213 | all of these member types sorted and then joined by a pipe (|). |
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214 | |
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215 | The constructor sets the implementation of the constraint so that is |
216 | simply calls C<check> on the newly created object. |
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217 | |
ae2f99ea |
218 | Finally, the constructor also makes sure that the object's C<coercion> |
219 | attribute is a L<Moose::Meta::TypeCoercion::Union> object. |
ecb59493 |
220 | |
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221 | =item B<< $constraint->type_constraints >> |
ecb59493 |
222 | |
ae2f99ea |
223 | This returns the array reference of C<type_constraints> provided to |
224 | the constructor. |
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225 | |
ae2f99ea |
226 | =item B<< $constraint->parents >> |
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227 | |
ae2f99ea |
228 | This returns the same constraint as the C<type_constraints> method. |
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229 | |
ae2f99ea |
230 | =item B<< $constraint->check($value) >> |
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231 | |
ae2f99ea |
232 | =item B<< $constraint->validate($value) >> |
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233 | |
ae2f99ea |
234 | These two methods simply call the relevant method on each of the |
235 | member type constraints in the union. If any type accepts the value, |
236 | the value is valid. |
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237 | |
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238 | With C<validate> the error message returned includes all of the error |
239 | messages returned by the member type constraints. |
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240 | |
ae2f99ea |
241 | =item B<< $constraint->equals($type_name_or_object) >> |
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242 | |
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243 | A type is considered equal if it is also a union type, and the two |
244 | unions have the same member types. |
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245 | |
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246 | =item B<< $constraint->find_type_for($value) >> |
247 | |
248 | This returns the first member type constraint for which C<check($value)> is |
249 | true, allowing you to determine which of the Union's member type constraints |
250 | a given value matches. |
251 | |
ae2f99ea |
252 | =item B<< $constraint->is_a_type_of($type_name_or_object) >> |
ecb59493 |
253 | |
ae2f99ea |
254 | This returns true if any of the member type constraints return true |
255 | for the C<is_a_type_of> method. |
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256 | |
ae2f99ea |
257 | =item B<< $constraint->is_subtype_of >> |
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258 | |
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259 | This returns true if any of the member type constraints return true |
260 | for the C<is_a_subtype_of> method. |
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261 | |
ae2f99ea |
262 | =item B<< $constraint->create_child_type(%options) >> |
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263 | |
ae2f99ea |
264 | This returns a new L<Moose::Meta::TypeConstraint> object with the type |
265 | as its parent. |
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266 | |
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267 | =back |
268 | |
269 | =head1 BUGS |
270 | |
d4048ef3 |
271 | See L<Moose/BUGS> for details on reporting bugs. |
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272 | |
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273 | =cut |