X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FTypeConstraint.pm;h=0318f679c15a8a169667f6e905ac956818e97a20;hb=4b2189ce8dae168787b635b71a918bd64461ed7a;hp=e7eaf1827a3f5b385e93263979f2363e32c84a5c;hpb=8de73ff1824ee835a072b36cd603deb7037983b5;p=gitmo%2FMoose.git

diff --git a/lib/Moose/Meta/TypeConstraint.pm b/lib/Moose/Meta/TypeConstraint.pm
index e7eaf18..0318f67 100644
--- a/lib/Moose/Meta/TypeConstraint.pm
+++ b/lib/Moose/Meta/TypeConstraint.pm
@@ -8,11 +8,12 @@ use metaclass;
 use overload '""'     => sub { shift->name },   # stringify to tc name
              fallback => 1;
 
-use Sub::Name    'subname';
-use Carp         'confess';
-use Scalar::Util 'blessed';
+use Scalar::Util qw(blessed refaddr);
 
-our $VERSION   = '0.10';
+use base qw(Class::MOP::Object);
+
+our $VERSION   = '0.72';
+$VERSION = eval $VERSION;
 our $AUTHORITY = 'cpan:STEVAN';
 
 __PACKAGE__->meta->add_attribute('name'       => (reader => 'name'));
@@ -20,10 +21,12 @@ __PACKAGE__->meta->add_attribute('parent'     => (
     reader    => 'parent',
     predicate => 'has_parent',
 ));
+
+my $null_constraint = sub { 1 };
 __PACKAGE__->meta->add_attribute('constraint' => (
     reader  => 'constraint',
     writer  => '_set_constraint',
-    default => sub { sub { 1 } }
+    default => sub { $null_constraint }
 ));
 __PACKAGE__->meta->add_attribute('message'   => (
     accessor  => 'message',
@@ -33,12 +36,18 @@ __PACKAGE__->meta->add_attribute('coercion'   => (
     accessor  => 'coercion',
     predicate => 'has_coercion'
 ));
+
 __PACKAGE__->meta->add_attribute('hand_optimized_type_constraint' => (
     init_arg  => 'optimized',
     accessor  => 'hand_optimized_type_constraint',
     predicate => 'has_hand_optimized_type_constraint',
 ));
 
+sub parents {
+    my $self;
+    $self->parent;
+}
+
 # private accessors
 
 __PACKAGE__->meta->add_attribute('compiled_type_constraint' => (
@@ -51,44 +60,104 @@ __PACKAGE__->meta->add_attribute('package_defined_in' => (
 
 sub new {
     my $class = shift;
-    my $self  = $class->meta->new_object(@_);
+    my ($first, @rest) = @_;
+    my %args = ref $first ? %$first : $first ? ($first, @rest) : ();
+    $args{name} = $args{name} ? "$args{name}" : "__ANON__";
+
+    my $self  = $class->_new(%args);
     $self->compile_type_constraint()
         unless $self->_has_compiled_type_constraint;
     return $self;
 }
 
-sub coerce   { ((shift)->coercion || confess "Cannot coerce without a type coercion")->coerce(@_) }
-sub check    { $_[0]->_compiled_type_constraint->($_[1]) }
+
+
+sub coerce {
+    my $self = shift;
+
+    my $coercion = $self->coercion;
+
+    unless ($coercion) {
+        require Moose;
+        Moose->throw_error("Cannot coerce without a type coercion");
+    }
+
+    return $coercion->coerce(@_);
+}
+
+sub check {
+    my ($self, @args) = @_;
+    my $constraint_subref = $self->_compiled_type_constraint;
+    return $constraint_subref->(@args) ? 1 : undef;
+}
+
 sub validate {
     my ($self, $value) = @_;
     if ($self->_compiled_type_constraint->($value)) {
         return undef;
     }
     else {
-        if ($self->has_message) {
-            local $_ = $value;
-            return $self->message->($value);
-        }
-        else {
-            return "Validation failed for '" . $self->name . "' failed";
-        }
+        $self->get_message($value);
+    }
+}
+
+sub get_message {
+    my ($self, $value) = @_;
+    if (my $msg = $self->message) {
+        local $_ = $value;
+        return $msg->($value);
     }
+    else {
+        $value = (defined $value ? overload::StrVal($value) : 'undef');        
+        return "Validation failed for '" . $self->name . "' failed with value $value";
+    }    
 }
 
 ## type predicates ...
 
+sub equals {
+    my ( $self, $type_or_name ) = @_;
+
+    my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
+
+    return 1 if refaddr($self) == refaddr($other);
+
+    if ( $self->has_hand_optimized_type_constraint and $other->has_hand_optimized_type_constraint ) {
+        return 1 if $self->hand_optimized_type_constraint == $other->hand_optimized_type_constraint;
+    }
+
+    return unless $self->constraint == $other->constraint;
+
+    if ( $self->has_parent ) {
+        return unless $other->has_parent;
+        return unless $self->parent->equals( $other->parent );
+    } else {
+        return if $other->has_parent;
+    }
+
+    return 1;
+}
+
 sub is_a_type_of {
-    my ($self, $type_name) = @_;
-    ($self->name eq $type_name || $self->is_subtype_of($type_name));
+    my ($self, $type_or_name) = @_;
+
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
+
+    ($self->equals($type) || $self->is_subtype_of($type));
 }
 
 sub is_subtype_of {
-    my ($self, $type_name) = @_;
+    my ($self, $type_or_name) = @_;
+
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
+
     my $current = $self;
+
     while (my $parent = $current->parent) {
-        return 1 if $parent->name eq $type_name;
+        return 1 if $parent->equals($type);
         $current = $parent;
     }
+
     return 0;
 }
 
@@ -108,10 +177,12 @@ sub _actually_compile_type_constraint {
         if $self->has_hand_optimized_type_constraint;
 
     my $check = $self->constraint;
-    (defined $check)
-        || confess "Could not compile type constraint '"
+    unless ( defined $check ) {
+        require Moose;
+        Moose->throw_error( "Could not compile type constraint '"
                 . $self->name
-                . "' because no constraint check";
+                . "' because no constraint check" );
+    }
 
     return $self->_compile_subtype($check)
         if $self->has_parent;
@@ -124,48 +195,75 @@ sub _compile_hand_optimized_type_constraint {
 
     my $type_constraint = $self->hand_optimized_type_constraint;
 
-    return sub {
-        confess unless ref $type_constraint;
-        return undef unless $type_constraint->($_[0]);
-        return 1;
-    };
+    unless ( ref $type_constraint ) {
+        require Moose;
+        Carp::confess ("Hand optimized type constraint for " . $self->name . " is not a code reference");
+        Moose->throw_error("Hand optimized type constraint is not a code reference");
+    }
+
+    return $type_constraint;
 }
 
 sub _compile_subtype {
     my ($self, $check) = @_;
 
-    # so we gather all the parents in order
-    # and grab their constraints ...
+    # gather all the parent constraintss in order
     my @parents;
+    my $optimized_parent;
     foreach my $parent ($self->_collect_all_parents) {
+        # if a parent is optimized, the optimized constraint already includes
+        # all of its parents tcs, so we can break the loop
         if ($parent->has_hand_optimized_type_constraint) {
-            unshift @parents => $parent->hand_optimized_type_constraint;
+            push @parents => $optimized_parent = $parent->hand_optimized_type_constraint;
             last;
         }
         else {
-            unshift @parents => $parent->constraint;
+            push @parents => $parent->constraint;
         }
     }
 
-    # then we compile them to run without
-    # having to recurse as we did before
-        return subname $self->name => sub {
-                local $_ = $_[0];
-        foreach my $parent (@parents) {
-            return undef unless $parent->($_[0]);
+    @parents = grep { $_ != $null_constraint } reverse @parents;
+
+    unless ( @parents ) {
+        return $self->_compile_type($check);
+    } elsif( $optimized_parent and @parents == 1 ) {
+        # the case of just one optimized parent is optimized to prevent
+        # looping and the unnecessary localization
+        if ( $check == $null_constraint ) {
+            return $optimized_parent;
+        } else {
+            return Class::MOP::subname($self->name, sub {
+                return undef unless $optimized_parent->($_[0]);
+                my (@args) = @_;
+                local $_ = $args[0];
+                $check->(@args);
+            });
         }
-                return undef unless $check->($_[0]);
-                1;
-        };
+    } else {
+        # general case, check all the constraints, from the first parent to ourselves
+        my @checks = @parents;
+        push @checks, $check if $check != $null_constraint;
+        return Class::MOP::subname($self->name => sub {
+            my (@args) = @_;
+            local $_ = $args[0];
+            foreach my $check (@checks) {
+                return undef unless $check->(@args);
+            }
+            return 1;
+        });
+    }
 }
 
 sub _compile_type {
     my ($self, $check) = @_;
-        return subname $self->name => sub {
-                local $_ = $_[0];
-                return undef unless $check->($_[0]);
-                1;
-        };
+
+    return $check if $check == $null_constraint; # Item, Any
+
+    return Class::MOP::subname($self->name => sub {
+        my (@args) = @_;
+        local $_ = $args[0];
+        $check->(@args);
+    });
 }
 
 ## other utils ...
@@ -181,9 +279,15 @@ sub _collect_all_parents {
     return @parents;
 }
 
+sub create_child_type {
+    my ($self, %opts) = @_;
+    my $class = ref $self;
+    return $class->new(%opts, parent => $self);
+}
+
 ## this should get deprecated actually ...
 
-sub union { die "DEPRECATED" }
+sub union { Carp::croak "DEPRECATED" }
 
 1;
 
@@ -214,12 +318,25 @@ If you wish to use features at this depth, please come to the
 
 =item B<new>
 
-=item B<is_a_type_of ($type_name)>
+=item B<equals ($type_name_or_object)>
 
-This checks the current type name, and if it does not match,
-checks if it is a subtype of it.
+This checks the current type against the supplied type (only).
+Returns false if the two types are not equal. It also returns false if
+you provide the type as a name, and the type name isn't found in the
+type registry.
 
-=item B<is_subtype_of ($type_name)>
+=item B<is_a_type_of ($type_name_or_object)>
+
+This checks the current type against the supplied type, or if the
+current type is a sub-type of the type name or object supplied. It
+also returns false if you provide the type as a name, and the type
+name isn't found in the type registry.
+
+=item B<is_subtype_of ($type_name_or_object)>
+
+This checks the current type is a sub-type of the type name or object
+supplied. It also returns false if you provide the type as a name, and
+the type name isn't found in the type registry.
 
 =item B<compile_type_constraint>
 
@@ -241,24 +358,51 @@ the C<message> will be used to construct a custom error message.
 
 =item B<name>
 
+The name of the type in the global type registry.
+
 =item B<parent>
 
+This type's parent type.
+
 =item B<has_parent>
 
+Returns true if this type has a parent type.
+
+=item B<parents>
+
+Synonym for C<parent>.
+
 =item B<constraint>
 
+Returns this type's constraint.  This is the value of C<where> provided
+when defining a type.
+
 =item B<has_message>
 
+Returns true if this type has a message.
+
 =item B<message>
 
+Returns this type's message.
+
+=item B<get_message ($value)>
+
+Generate message for $value.
+
 =item B<has_coercion>
 
+Returns true if this type has a coercion.
+
 =item B<coercion>
 
+Returns this type's L<Moose::Meta::TypeCoercion> if one exists.
+
 =item B<hand_optimized_type_constraint>
 
 =item B<has_hand_optimized_type_constraint>
 
+=item B<create_child_type>
+
 =back
 
 =head2 DEPRECATED METHOD
@@ -284,7 +428,7 @@ Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2006, 2007 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
 
 L<http://www.iinteractive.com>