fix whitespace

[gitmo/MooseX-UndefTolerant.git] / lib / MooseX / UndefTolerant / Constructor.pm

diff --git a/lib/MooseX/UndefTolerant/Constructor.pm b/lib/MooseX/UndefTolerant/Constructor.pm
index b9ccc0b..4406f2c 100644 (file)
--- a/lib/MooseX/UndefTolerant/Constructor.pm
+++ b/lib/MooseX/UndefTolerant/Constructor.pm
@@ -2,29 +2,33 @@ package MooseX::UndefTolerant::Constructor;
 use Moose::Role;
 
 if ( $Moose::VERSION < 1.9900 ) {
-        around('_generate_slot_initializer', sub {
-                my $orig = shift;
-                my $self = shift;
+    around('_generate_slot_initializer', sub {
+        my $orig = shift;
+        my $self = shift;
 
-                # note the key in the params may not match the attr name.
-                my $key_name = $self->_attributes->[$_[0]]->init_arg;
+        # note the key in the params may not match the attr name.
+        my $key_name = $self->_attributes->[$_[0]]->init_arg;
 
-                # insert a line of code at the start of the initializer,
-                # clearing the param if it's undefined.
+        # insert a line of code at the start of the initializer,
+        # clearing the param if it's undefined.
 
-                if (defined $key_name) {
-                        my $tolerant_code = 
-                             qq# delete \$params->{'$key_name'} unless # . 
-                             qq# exists \$params->{'$key_name'} && defined \$params->{'$key_name'};\n#;
+        if (defined $key_name)
+        {
+            # leave the value unscathed if the attribute's type constraint can
+            # handle undef (or doesn't have one, which implicitly means it can)
+            my $type_constraint = $self->_attributes->[$_[0]]->type_constraint;
+            if ($type_constraint and not $type_constraint->check(undef))
+            {
+                my $tolerant_code =
+                    qq# delete \$params->{'$key_name'} unless # .
+                    qq# exists \$params->{'$key_name'} && defined \$params->{'$key_name'};\n#;
 
-                        return $tolerant_code . $self->$orig(@_);
-                }
-                else {
-                        return $self->$orig(@_);
-                }
-        });
-}
+                return $tolerant_code . $self->$orig(@_);
+            }
+        }
 
-no Moose::Role;
+        return $self->$orig(@_);
+});
 
+no Moose::Role;
 1;