Commit | Line | Data |
684db121 |
1 | package Mouse::Meta::TypeConstraint; |
bc69ee88 |
2 | use Mouse::Util qw(:meta); # enables strict and warnings |
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3 | |
f5ee065f |
4 | use overload |
c489a477 |
5 | 'bool' => sub { 1 }, # always true |
6 | |
93540011 |
7 | '""' => sub { $_[0]->name }, # stringify to tc name |
8adc0b23 |
8 | |
9 | '|' => sub { # or-combination |
10 | require Mouse::Util::TypeConstraints; |
11 | return Mouse::Util::TypeConstraints::find_or_parse_type_constraint( |
12 | "$_[0] | $_[1]", |
13 | ); |
14 | }, |
15 | |
f5ee065f |
16 | fallback => 1; |
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17 | |
ca352580 |
18 | use Carp (); |
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19 | |
684db121 |
20 | sub new { |
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21 | my($class, %args) = @_; |
22 | |
23 | $args{name} = '__ANON__' if !defined $args{name}; |
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24 | |
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25 | my $check = delete $args{optimized}; |
26 | |
3b89ea91 |
27 | if($check){ |
28 | $args{hand_optimized_type_constraint} = $check; |
29 | $args{compiled_type_constraint} = $check; |
30 | } |
31 | |
32 | $check = $args{constraint}; |
f5ee065f |
33 | |
f5ee065f |
34 | if(defined($check) && ref($check) ne 'CODE'){ |
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35 | Carp::confess("Constraint for $args{name} is not a CODE reference"); |
f5ee065f |
36 | } |
37 | |
38 | my $self = bless \%args, $class; |
3b89ea91 |
39 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
f5ee065f |
40 | |
536e3c33 |
41 | $self->_compile_union_type_coercion() if $self->{type_constraints}; |
f5ee065f |
42 | return $self; |
43 | } |
44 | |
45 | sub create_child_type{ |
46 | my $self = shift; |
e98220ab |
47 | # XXX: FIXME |
48 | return ref($self)->new( |
3b89ea91 |
49 | # a child inherits its parent's attributes |
50 | %{$self}, |
51 | |
52 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
53 | compiled_type_constraint => undef, |
54 | hand_optimized_type_constraint => undef, |
55 | |
56 | # and is given child-specific args, of course. |
57 | @_, |
58 | |
59 | # and its parent |
60 | parent => $self, |
e98220ab |
61 | ); |
684db121 |
62 | } |
63 | |
4c99ea95 |
64 | sub name; |
65 | sub parent; |
66 | sub message; |
67 | sub has_coercion; |
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68 | |
69 | sub type_parameter; |
70 | sub __is_parameterized; |
71 | |
4c99ea95 |
72 | sub _compiled_type_constraint; |
73 | sub _compiled_type_coercion; |
74 | |
75 | sub compile_type_constraint; |
76 | |
ffbbf459 |
77 | sub _add_type_coercions{ |
78 | my $self = shift; |
79 | |
80 | my $coercions = ($self->{_coercion_map} ||= []); |
81 | my %has = map{ $_->[0] => undef } @{$coercions}; |
82 | |
83 | for(my $i = 0; $i < @_; $i++){ |
84 | my $from = $_[ $i]; |
85 | my $action = $_[++$i]; |
86 | |
87 | if(exists $has{$from}){ |
ca352580 |
88 | Carp::confess("A coercion action already exists for '$from'"); |
ffbbf459 |
89 | } |
90 | |
91 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
ca352580 |
92 | or Carp::confess("Could not find the type constraint ($from) to coerce from"); |
ffbbf459 |
93 | |
94 | push @{$coercions}, [ $type => $action ]; |
95 | } |
96 | |
97 | # compile |
98 | if(exists $self->{type_constraints}){ # union type |
ca352580 |
99 | Carp::confess("Cannot add additional type coercions to Union types"); |
ffbbf459 |
100 | } |
101 | else{ |
536e3c33 |
102 | $self->_compile_type_coercion(); |
103 | } |
104 | return; |
105 | } |
106 | |
107 | sub _compile_type_coercion { |
108 | my($self) = @_; |
109 | |
110 | my @coercions = @{$self->{_coercion_map}}; |
111 | |
112 | $self->{_compiled_type_coercion} = sub { |
113 | my($thing) = @_; |
114 | foreach my $pair (@coercions) { |
115 | #my ($constraint, $converter) = @$pair; |
116 | if ($pair->[0]->check($thing)) { |
117 | local $_ = $thing; |
118 | return $pair->[1]->($thing); |
119 | } |
120 | } |
121 | return $thing; |
122 | }; |
123 | return; |
124 | } |
125 | |
126 | sub _compile_union_type_coercion { |
127 | my($self) = @_; |
128 | |
129 | my @coercions; |
130 | foreach my $type(@{$self->{type_constraints}}){ |
131 | if($type->has_coercion){ |
132 | push @coercions, $type; |
133 | } |
134 | } |
135 | if(@coercions){ |
ffbbf459 |
136 | $self->{_compiled_type_coercion} = sub { |
536e3c33 |
137 | my($thing) = @_; |
138 | foreach my $type(@coercions){ |
139 | my $value = $type->coerce($thing); |
140 | return $value if $self->check($value); |
141 | } |
142 | return $thing; |
ffbbf459 |
143 | }; |
144 | } |
145 | return; |
146 | } |
147 | |
feb0e21b |
148 | sub check { |
149 | my $self = shift; |
ffbbf459 |
150 | return $self->_compiled_type_constraint->(@_); |
151 | } |
152 | |
153 | sub coerce { |
154 | my $self = shift; |
ffbbf459 |
155 | |
de0d4152 |
156 | my $coercion = $self->_compiled_type_coercion; |
157 | if(!$coercion){ |
158 | Carp::confess("Cannot coerce without a type coercion"); |
159 | } |
160 | |
ffbbf459 |
161 | return $_[0] if $self->_compiled_type_constraint->(@_); |
162 | |
de0d4152 |
163 | return $coercion->(@_); |
feb0e21b |
164 | } |
165 | |
166 | sub get_message { |
167 | my ($self, $value) = @_; |
168 | if ( my $msg = $self->message ) { |
169 | local $_ = $value; |
170 | return $msg->($value); |
171 | } |
172 | else { |
173 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
174 | return "Validation failed for '$self' failed with value $value"; |
175 | } |
176 | } |
177 | |
178 | sub is_a_type_of{ |
179 | my($self, $other) = @_; |
180 | |
181 | # ->is_a_type_of('__ANON__') is always false |
ca352580 |
182 | return 0 if !ref($other) && $other eq '__ANON__'; |
feb0e21b |
183 | |
184 | (my $other_name = $other) =~ s/\s+//g; |
185 | |
186 | return 1 if $self->name eq $other_name; |
187 | |
188 | if(exists $self->{type_constraints}){ # union |
189 | foreach my $type(@{$self->{type_constraints}}){ |
190 | return 1 if $type->name eq $other_name; |
191 | } |
192 | } |
193 | |
194 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
195 | return 1 if $parent->name eq $other_name; |
196 | } |
197 | |
198 | return 0; |
199 | } |
200 | |
b4d791ba |
201 | # See also Moose::Meta::TypeConstraint::Parameterizable |
202 | sub parameterize{ |
203 | my($self, $param, $name) = @_; |
204 | |
205 | if(!ref $param){ |
206 | require Mouse::Util::TypeConstraints; |
207 | $param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param); |
208 | } |
209 | |
210 | $name ||= sprintf '%s[%s]', $self->name, $param->name; |
211 | |
212 | my $generator = $self->{constraint_generator} |
213 | || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type"); |
214 | |
215 | return Mouse::Meta::TypeConstraint->new( |
fc83f4cf |
216 | name => $name, |
217 | parent => $self, |
218 | type_parameter => $param, |
219 | constraint => $generator->($param), # must be 'constraint', not 'optimized' |
b4d791ba |
220 | |
fc83f4cf |
221 | type => 'Parameterized', |
b4d791ba |
222 | ); |
223 | } |
feb0e21b |
224 | |
78508064 |
225 | sub assert_valid { |
226 | my ($self, $value) = @_; |
227 | |
228 | if(!$self->_compiled_type_constraint->($value)){ |
229 | Carp::confess($self->get_message($value)); |
230 | } |
231 | return 1; |
232 | } |
233 | |
684db121 |
234 | 1; |
235 | __END__ |
236 | |
237 | =head1 NAME |
238 | |
1820fffe |
239 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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240 | |
a25ca8d6 |
241 | =head1 VERSION |
242 | |
4bc73e47 |
243 | This document describes Mouse version 0.50_03 |
a25ca8d6 |
244 | |
684db121 |
245 | =head1 DESCRIPTION |
246 | |
247 | For the most part, the only time you will ever encounter an |
248 | instance of this class is if you are doing some serious deep |
249 | introspection. This API should not be considered final, but |
250 | it is B<highly unlikely> that this will matter to a regular |
251 | Mouse user. |
252 | |
253 | Don't use this. |
254 | |
255 | =head1 METHODS |
256 | |
257 | =over 4 |
258 | |
259 | =item B<new> |
260 | |
261 | =item B<name> |
262 | |
263 | =back |
264 | |
1820fffe |
265 | =head1 SEE ALSO |
266 | |
267 | L<Moose::Meta::TypeConstraint> |
268 | |
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269 | =cut |
270 | |