package Mouse::Meta::TypeConstraint;
-use strict;
-use warnings;
+use Mouse::Util qw(:meta); # enables strict and warnings
use overload
'""' => sub { shift->{name} }, # stringify to tc name
use Carp qw(confess);
use Scalar::Util qw(blessed reftype);
-use Mouse::Util qw(:meta);
-
my $null_check = sub { 1 };
sub new {
my $self = bless \%args, $class;
$self->compile_type_constraint() if !$self->{hand_optimized_type_constraint};
+ if($self->{type_constraints}){ # Union
+ my @coercions;
+ foreach my $type(@{$self->{type_constraints}}){
+ if($type->has_coercion){
+ push @coercions, $type;
+ }
+ }
+ if(@coercions){
+ $self->{_compiled_type_coercion} = sub {
+ my($thing) = @_;
+ foreach my $type(@coercions){
+ my $value = $type->coerce($thing);
+ return $value if $self->check($value);
+ }
+ return $thing;
+ };
+ }
+ }
+
return $self;
}
sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} }
+sub has_coercion{ exists $_[0]->{_compiled_type_coercion} }
sub compile_type_constraint{
my($self) = @_;
return;
}
+sub _add_type_coercions{
+ my $self = shift;
+
+ my $coercions = ($self->{_coercion_map} ||= []);
+ my %has = map{ $_->[0] => undef } @{$coercions};
+
+ for(my $i = 0; $i < @_; $i++){
+ my $from = $_[ $i];
+ my $action = $_[++$i];
+
+ if(exists $has{$from}){
+ confess("A coercion action already exists for '$from'");
+ }
+
+ my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
+ or confess("Could not find the type constraint ($from) to coerce from");
+
+ push @{$coercions}, [ $type => $action ];
+ }
+
+ # compile
+ if(exists $self->{type_constraints}){ # union type
+ confess("Cannot add additional type coercions to Union types");
+ }
+ else{
+ $self->{_compiled_type_coercion} = sub {
+ my($thing) = @_;\r
+ foreach my $pair (@{$coercions}) {\r
+ #my ($constraint, $converter) = @$pair;\r
+ if ($pair->[0]->check($thing)) {\r
+ local $_ = $thing;
+ return $pair->[1]->($thing);
+ }\r
+ }\r
+ return $thing;\r
+ };
+ }
+ return;
+}
+
sub check {
my $self = shift;
- $self->_compiled_type_constraint->(@_);
+ return $self->_compiled_type_constraint->(@_);
+}
+
+sub coerce {
+ my $self = shift;
+ if(!$self->{_compiled_type_coercion}){
+ confess("Cannot coerce without a type coercion ($self)");
+ }
+
+ return $_[0] if $self->_compiled_type_constraint->(@_);
+
+ return $self->{_compiled_type_coercion}->(@_);
}
sub get_message {