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1 | package Mouse::Meta::TypeConstraint; |
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2 | use Mouse::Util qw(:meta); # enables strict and warnings |
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3 | |
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4 | use overload |
5 | '""' => sub { shift->{name} }, # stringify to tc name |
6 | fallback => 1; |
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7 | |
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8 | use Carp qw(confess); |
9 | use Scalar::Util qw(blessed reftype); |
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10 | |
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11 | my $null_check = sub { 1 }; |
12 | |
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13 | sub new { |
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14 | my($class, %args) = @_; |
15 | |
16 | $args{name} = '__ANON__' if !defined $args{name}; |
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17 | |
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18 | my $check = delete $args{optimized}; |
19 | |
20 | if($args{_compiled_type_constraint}){ |
21 | Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead"); |
22 | $check = $args{_compiled_type_constraint}; |
23 | |
24 | if(blessed($check)){ |
25 | Carp::cluck("Constraint must be a CODE reference"); |
26 | $check = $check->{compiled_type_constraint}; |
27 | } |
28 | } |
29 | |
30 | if($check){ |
31 | $args{hand_optimized_type_constraint} = $check; |
32 | $args{compiled_type_constraint} = $check; |
33 | } |
34 | |
35 | $check = $args{constraint}; |
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36 | |
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37 | if(blessed($check)){ |
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38 | Carp::cluck("Constraint for $args{name} must be a CODE reference"); |
39 | $check = $check->{compiled_type_constraint}; |
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40 | } |
41 | |
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42 | if(defined($check) && ref($check) ne 'CODE'){ |
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43 | confess("Constraint for $args{name} is not a CODE reference"); |
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44 | } |
45 | |
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46 | $args{package_defined_in} ||= caller; |
47 | |
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48 | my $self = bless \%args, $class; |
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49 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
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50 | |
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51 | if($self->{type_constraints}){ # Union |
52 | my @coercions; |
53 | foreach my $type(@{$self->{type_constraints}}){ |
54 | if($type->has_coercion){ |
55 | push @coercions, $type; |
56 | } |
57 | } |
58 | if(@coercions){ |
59 | $self->{_compiled_type_coercion} = sub { |
60 | my($thing) = @_; |
61 | foreach my $type(@coercions){ |
62 | my $value = $type->coerce($thing); |
63 | return $value if $self->check($value); |
64 | } |
65 | return $thing; |
66 | }; |
67 | } |
68 | } |
69 | |
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70 | return $self; |
71 | } |
72 | |
73 | sub create_child_type{ |
74 | my $self = shift; |
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75 | # XXX: FIXME |
76 | return ref($self)->new( |
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77 | # a child inherits its parent's attributes |
78 | %{$self}, |
79 | |
80 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
81 | compiled_type_constraint => undef, |
82 | hand_optimized_type_constraint => undef, |
83 | |
84 | # and is given child-specific args, of course. |
85 | @_, |
86 | |
87 | # and its parent |
88 | parent => $self, |
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89 | ); |
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90 | } |
91 | |
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92 | sub name { $_[0]->{name} } |
93 | sub parent { $_[0]->{parent} } |
94 | sub message { $_[0]->{message} } |
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95 | |
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96 | sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} } |
97 | |
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98 | sub has_coercion{ exists $_[0]->{_compiled_type_coercion} } |
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99 | |
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100 | sub compile_type_constraint{ |
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101 | my($self) = @_; |
102 | |
103 | # add parents first |
104 | my @checks; |
105 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
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106 | if($parent->{hand_optimized_type_constraint}){ |
107 | push @checks, $parent->{hand_optimized_type_constraint}; |
108 | last; # a hand optimized constraint must include all the parents |
109 | } |
110 | elsif($parent->{constraint}){ |
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111 | push @checks, $parent->{constraint}; |
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112 | } |
113 | } |
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114 | |
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115 | # then add child |
116 | if($self->{constraint}){ |
117 | push @checks, $self->{constraint}; |
118 | } |
119 | |
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120 | if($self->{type_constraints}){ # Union |
121 | my @types = map{ $_->_compiled_type_constraint } @{ $self->{type_constraints} }; |
122 | push @checks, sub{ |
123 | foreach my $c(@types){ |
124 | return 1 if $c->($_[0]); |
125 | } |
126 | return 0; |
127 | }; |
128 | } |
129 | |
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130 | if(@checks == 0){ |
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131 | $self->{compiled_type_constraint} = $null_check; |
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132 | } |
133 | elsif(@checks == 1){ |
134 | my $c = $checks[0]; |
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135 | $self->{compiled_type_constraint} = sub{ |
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136 | my(@args) = @_; |
137 | local $_ = $args[0]; |
138 | return $c->(@args); |
139 | }; |
140 | } |
141 | else{ |
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142 | $self->{compiled_type_constraint} = sub{ |
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143 | my(@args) = @_; |
144 | local $_ = $args[0]; |
145 | foreach my $c(@checks){ |
146 | return undef if !$c->(@args); |
147 | } |
148 | return 1; |
149 | }; |
150 | } |
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151 | return; |
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152 | } |
153 | |
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154 | sub _add_type_coercions{ |
155 | my $self = shift; |
156 | |
157 | my $coercions = ($self->{_coercion_map} ||= []); |
158 | my %has = map{ $_->[0] => undef } @{$coercions}; |
159 | |
160 | for(my $i = 0; $i < @_; $i++){ |
161 | my $from = $_[ $i]; |
162 | my $action = $_[++$i]; |
163 | |
164 | if(exists $has{$from}){ |
165 | confess("A coercion action already exists for '$from'"); |
166 | } |
167 | |
168 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
169 | or confess("Could not find the type constraint ($from) to coerce from"); |
170 | |
171 | push @{$coercions}, [ $type => $action ]; |
172 | } |
173 | |
174 | # compile |
175 | if(exists $self->{type_constraints}){ # union type |
176 | confess("Cannot add additional type coercions to Union types"); |
177 | } |
178 | else{ |
179 | $self->{_compiled_type_coercion} = sub { |
180 | my($thing) = @_;\r |
181 | foreach my $pair (@{$coercions}) {\r |
182 | #my ($constraint, $converter) = @$pair;\r |
183 | if ($pair->[0]->check($thing)) {\r |
184 | local $_ = $thing; |
185 | return $pair->[1]->($thing); |
186 | }\r |
187 | }\r |
188 | return $thing;\r |
189 | }; |
190 | } |
191 | return; |
192 | } |
193 | |
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194 | sub check { |
195 | my $self = shift; |
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196 | return $self->_compiled_type_constraint->(@_); |
197 | } |
198 | |
199 | sub coerce { |
200 | my $self = shift; |
201 | if(!$self->{_compiled_type_coercion}){ |
202 | confess("Cannot coerce without a type coercion ($self)"); |
203 | } |
204 | |
205 | return $_[0] if $self->_compiled_type_constraint->(@_); |
206 | |
207 | return $self->{_compiled_type_coercion}->(@_); |
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208 | } |
209 | |
210 | sub get_message { |
211 | my ($self, $value) = @_; |
212 | if ( my $msg = $self->message ) { |
213 | local $_ = $value; |
214 | return $msg->($value); |
215 | } |
216 | else { |
217 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
218 | return "Validation failed for '$self' failed with value $value"; |
219 | } |
220 | } |
221 | |
222 | sub is_a_type_of{ |
223 | my($self, $other) = @_; |
224 | |
225 | # ->is_a_type_of('__ANON__') is always false |
226 | return 0 if !blessed($other) && $other eq '__ANON__'; |
227 | |
228 | (my $other_name = $other) =~ s/\s+//g; |
229 | |
230 | return 1 if $self->name eq $other_name; |
231 | |
232 | if(exists $self->{type_constraints}){ # union |
233 | foreach my $type(@{$self->{type_constraints}}){ |
234 | return 1 if $type->name eq $other_name; |
235 | } |
236 | } |
237 | |
238 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
239 | return 1 if $parent->name eq $other_name; |
240 | } |
241 | |
242 | return 0; |
243 | } |
244 | |
245 | |
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246 | 1; |
247 | __END__ |
248 | |
249 | =head1 NAME |
250 | |
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251 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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252 | |
253 | =head1 DESCRIPTION |
254 | |
255 | For the most part, the only time you will ever encounter an |
256 | instance of this class is if you are doing some serious deep |
257 | introspection. This API should not be considered final, but |
258 | it is B<highly unlikely> that this will matter to a regular |
259 | Mouse user. |
260 | |
261 | Don't use this. |
262 | |
263 | =head1 METHODS |
264 | |
265 | =over 4 |
266 | |
267 | =item B<new> |
268 | |
269 | =item B<name> |
270 | |
271 | =back |
272 | |
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273 | =head1 SEE ALSO |
274 | |
275 | L<Moose::Meta::TypeConstraint> |
276 | |
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277 | =cut |
278 | |