1 package Mouse::Meta::TypeConstraint;
2 use Mouse::Util qw(:meta); # enables strict and warnings
5 'bool' => sub { 1 }, # always true
7 '""' => sub { $_[0]->name }, # stringify to tc name
9 '|' => sub { # or-combination
10 require Mouse::Util::TypeConstraints;
11 return Mouse::Util::TypeConstraints::find_or_parse_type_constraint(
21 my($class, %args) = @_;
23 $args{name} = '__ANON__' if !defined $args{name};
25 my $check = delete $args{optimized};
28 $args{hand_optimized_type_constraint} = $check;
29 $args{compiled_type_constraint} = $check;
32 $check = $args{constraint};
34 if(defined($check) && ref($check) ne 'CODE'){
35 Carp::confess("Constraint for $args{name} is not a CODE reference");
38 $args{package_defined_in} ||= caller;
40 my $self = bless \%args, $class;
41 $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint};
43 if($self->{type_constraints}){ # Union
45 foreach my $type(@{$self->{type_constraints}}){
46 if($type->has_coercion){
47 push @coercions, $type;
51 $self->{_compiled_type_coercion} = sub {
53 foreach my $type(@coercions){
54 my $value = $type->coerce($thing);
55 return $value if $self->check($value);
65 sub create_child_type{
68 return ref($self)->new(
69 # a child inherits its parent's attributes
72 # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint'
73 compiled_type_constraint => undef,
74 hand_optimized_type_constraint => undef,
76 # and is given child-specific args, of course.
88 sub _compiled_type_constraint;
89 sub _compiled_type_coercion;
91 sub compile_type_constraint;
93 sub _add_type_coercions{
96 my $coercions = ($self->{_coercion_map} ||= []);
97 my %has = map{ $_->[0] => undef } @{$coercions};
99 for(my $i = 0; $i < @_; $i++){
101 my $action = $_[++$i];
103 if(exists $has{$from}){
104 Carp::confess("A coercion action already exists for '$from'");
107 my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
108 or Carp::confess("Could not find the type constraint ($from) to coerce from");
110 push @{$coercions}, [ $type => $action ];
114 if(exists $self->{type_constraints}){ # union type
115 Carp::confess("Cannot add additional type coercions to Union types");
118 $self->{_compiled_type_coercion} = sub {
120 foreach my $pair (@{$coercions}) {
121 #my ($constraint, $converter) = @$pair;
122 if ($pair->[0]->check($thing)) {
124 return $pair->[1]->($thing);
135 return $self->_compiled_type_constraint->(@_);
141 return $_[0] if $self->_compiled_type_constraint->(@_);
143 my $coercion = $self->_compiled_type_coercion;
144 return $coercion ? $coercion->(@_) : $_[0];
148 my ($self, $value) = @_;
149 if ( my $msg = $self->message ) {
151 return $msg->($value);
154 $value = ( defined $value ? overload::StrVal($value) : 'undef' );
155 return "Validation failed for '$self' failed with value $value";
160 my($self, $other) = @_;
162 # ->is_a_type_of('__ANON__') is always false
163 return 0 if !ref($other) && $other eq '__ANON__';
165 (my $other_name = $other) =~ s/\s+//g;
167 return 1 if $self->name eq $other_name;
169 if(exists $self->{type_constraints}){ # union
170 foreach my $type(@{$self->{type_constraints}}){
171 return 1 if $type->name eq $other_name;
175 for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){
176 return 1 if $parent->name eq $other_name;
182 # See also Moose::Meta::TypeConstraint::Parameterizable
184 my($self, $param, $name) = @_;
187 require Mouse::Util::TypeConstraints;
188 $param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param);
191 $name ||= sprintf '%s[%s]', $self->name, $param->name;
193 my $generator = $self->{constraint_generator}
194 || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type");
196 return Mouse::Meta::TypeConstraint->new(
200 constraint => $generator->($param), # must be 'constraint', not 'optimized'
202 type => 'Parameterized',
211 Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
215 This document describes Mouse version 0.49
219 For the most part, the only time you will ever encounter an
220 instance of this class is if you are doing some serious deep
221 introspection. This API should not be considered final, but
222 it is B<highly unlikely> that this will matter to a regular
239 L<Moose::Meta::TypeConstraint>