bump version to 1.25

[gitmo/Moose.git] / lib / Moose / Meta / TypeConstraint / Union.pm

diff --git a/lib/Moose/Meta/TypeConstraint/Union.pm b/lib/Moose/Meta/TypeConstraint/Union.pm
index 4603d55..ad9b414 100644 (file)
--- a/lib/Moose/Meta/TypeConstraint/Union.pm
+++ b/lib/Moose/Meta/TypeConstraint/Union.pm
@@ -7,7 +7,9 @@ use metaclass;
 
 use Moose::Meta::TypeCoercion::Union;
 
-our $VERSION   = '0.93_01';
+use List::Util qw(first);
+
+our $VERSION   = '1.25';
 $VERSION = eval $VERSION;
 our $AUTHORITY = 'cpan:STEVAN';
 
@@ -30,12 +32,34 @@ sub new {
     );
 
     $self->_set_constraint(sub { $self->check($_[0]) });
-    $self->coercion(Moose::Meta::TypeCoercion::Union->new(
-        type_constraint => $self
-    ));
+
     return $self;
 }
 
+# XXX - this is a rather gross implementation of laziness for the benefit of
+# MX::Types. If we try to call ->has_coercion on the objects during object
+# construction, this does not work when defining a recursive constraint with
+# MX::Types.
+sub coercion {
+    my $self = shift;
+
+    return $self->{coercion} if exists $self->{coercion};
+
+    # Using any instead of grep here causes a weird error with some corner
+    # cases when MX::Types is in use. See RT #61001.
+    if ( grep { $_->has_coercion } @{ $self->type_constraints } ) {
+        return $self->{coercion} = Moose::Meta::TypeCoercion::Union->new(
+            type_constraint => $self );
+    }
+    else {
+        return $self->{coercion} = undef;
+    }
+}
+
+sub has_coercion {
+    return defined $_[0]->coercion;
+}
+
 sub _actually_compile_type_constraint {
     my $self = shift;
 
@@ -93,6 +117,12 @@ sub validate {
     return ($message . ' in (' . $self->name . ')') ;
 }
 
+sub find_type_for {
+    my ($self, $value) = @_;
+
+    return first { $_->check($value) } @{ $self->type_constraints };
+}
+
 sub is_a_type_of {
     my ($self, $type_name) = @_;
     foreach my $type (@{$self->type_constraints}) {
@@ -197,6 +227,12 @@ messages returned by the member type constraints.
 A type is considered equal if it is also a union type, and the two
 unions have the same member types.
 
+=item B<< $constraint->find_type_for($value) >>
+
+This returns the first member type constraint for which C<check($value)> is
+true, allowing you to determine which of the Union's member type constraints
+a given value matches.
+
 =item B<< $constraint->is_a_type_of($type_name_or_object) >>
 
 This returns true if any of the member type constraints return true