X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FTypeConstraint.pm;h=34bc437f108539b618dae088df651560a9046d26;hb=1b2aea393ea1e336731ca6831f57e17615f769d9;hp=785ba5c61be733a49ee8d4e29e7c871c245d77b6;hpb=4e036ee4269310099ef139f2fa14673d821f629a;p=gitmo%2FMoose.git

diff --git a/lib/Moose/Meta/TypeConstraint.pm b/lib/Moose/Meta/TypeConstraint.pm
index 785ba5c..34bc437 100644
--- a/lib/Moose/Meta/TypeConstraint.pm
+++ b/lib/Moose/Meta/TypeConstraint.pm
@@ -5,29 +5,224 @@ use strict;
 use warnings;
 use metaclass;
 
-Moose::Meta::TypeConstraint->meta->add_attribute(
-    Class::MOP::Attribute->new('name' => (
-        reader => 'name'
-    ))	
-);
-
-Moose::Meta::TypeConstraint->meta->add_attribute(
-    Class::MOP::Attribute->new('constraint_code' => (
-        reader => 'constraint_code'
-    ))	
-);
-
-Moose::Meta::TypeConstraint->meta->add_attribute(
-    Class::MOP::Attribute->new('coercion_code' => (
-        reader    => 'coercion_code',
-        writer    => 'set_coercion_code',        
-        predicate => 'has_coercion'
-    ))	
-);
-
-sub new    { (shift)->meta->new_object(@_)  }
-sub check  { (shift)->constraint_code->(@_) }
-sub coerce { (shift)->coercion_code->(@_)   }
+use overload '""'     => sub { shift->name },   # stringify to tc name
+             fallback => 1;
+
+use Carp         'confess';
+use Scalar::Util qw(blessed refaddr);
+
+our $VERSION   = '0.13';
+our $AUTHORITY = 'cpan:STEVAN';
+
+__PACKAGE__->meta->add_attribute('name'       => (reader => 'name'));
+__PACKAGE__->meta->add_attribute('parent'     => (
+    reader    => 'parent',
+    predicate => 'has_parent',
+));
+__PACKAGE__->meta->add_attribute('constraint' => (
+    reader  => 'constraint',
+    writer  => '_set_constraint',
+    default => sub { sub { 1 } }
+));
+__PACKAGE__->meta->add_attribute('message'   => (
+    accessor  => 'message',
+    predicate => 'has_message'
+));
+__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' => (
+    accessor  => '_compiled_type_constraint',
+    predicate => '_has_compiled_type_constraint'
+));
+__PACKAGE__->meta->add_attribute('package_defined_in' => (
+    accessor => '_package_defined_in'
+));
+
+sub new {
+    my $class = shift;
+    my $self  = $class->meta->new_object(@_);
+    $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]) ? 1 : undef }
+sub validate {
+    my ($self, $value) = @_;
+    if ($self->_compiled_type_constraint->($value)) {
+        return undef;
+    }
+    else {
+        $self->get_message($value);
+    }
+}
+
+sub get_message {
+    my ($self, $value) = @_;
+    $value = (defined $value ? overload::StrVal($value) : 'undef');
+    if (my $msg = $self->message) {
+        local $_ = $value;
+        return $msg->($value);
+    }
+    else {
+        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);
+
+    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_or_name) = @_;
+
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+
+    ($self->equals($type) || $self->is_subtype_of($type));
+}
+
+sub is_subtype_of {
+    my ($self, $type_or_name) = @_;
+
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+
+    my $current = $self;
+
+    while (my $parent = $current->parent) {
+        return 1 if $parent->equals($type);
+        $current = $parent;
+    }
+
+    return 0;
+}
+
+## compiling the type constraint
+
+sub compile_type_constraint {
+    my $self = shift;
+    $self->_compiled_type_constraint($self->_actually_compile_type_constraint);
+}
+
+## type compilers ...
+
+sub _actually_compile_type_constraint {
+    my $self = shift;
+
+    return $self->_compile_hand_optimized_type_constraint
+        if $self->has_hand_optimized_type_constraint;
+
+    my $check = $self->constraint;
+    (defined $check)
+        || confess "Could not compile type constraint '"
+                . $self->name
+                . "' because no constraint check";
+
+    return $self->_compile_subtype($check)
+        if $self->has_parent;
+
+    return $self->_compile_type($check);
+}
+
+sub _compile_hand_optimized_type_constraint {
+    my $self = shift;
+
+    my $type_constraint = $self->hand_optimized_type_constraint;
+
+    confess unless ref $type_constraint;
+
+    return $type_constraint;
+}
+
+sub _compile_subtype {
+    my ($self, $check) = @_;
+
+    # so we gather all the parents in order
+    # and grab their constraints ...
+    my @parents;
+    foreach my $parent ($self->_collect_all_parents) {
+        if ($parent->has_hand_optimized_type_constraint) {
+            unshift @parents => $parent->hand_optimized_type_constraint;
+            last;
+        }
+        else {
+            unshift @parents => $parent->constraint;
+        }
+    }
+
+    # then we compile them to run without
+    # having to recurse as we did before
+    return Class::MOP::subname($self->name => sub {
+        local $_ = $_[0];
+        foreach my $parent (@parents) {
+            return undef unless $parent->($_[0]);
+        }
+        return undef unless $check->($_[0]);
+        1;
+    });
+}
+
+sub _compile_type {
+    my ($self, $check) = @_;
+    return Class::MOP::subname($self->name => sub {
+        local $_ = $_[0];
+        return undef unless $check->($_[0]);
+        1;
+    });
+}
+
+## other utils ...
+
+sub _collect_all_parents {
+    my $self = shift;
+    my @parents;
+    my $current = $self->parent;
+    while (defined $current) {
+        push @parents => $current;
+        $current = $current->parent;
+    }
+    return @parents;
+}
+
+## this should get deprecated actually ...
+
+sub union { Carp::croak "DEPRECATED" }
 
 1;
 
@@ -37,12 +232,19 @@ __END__
 
 =head1 NAME
 
-Moose::Meta::TypeConstraint - The Moose Type Constraint metaobject
-
-=head1 SYNOPSIS
+Moose::Meta::TypeConstraint - The Moose Type Constraint metaclass
 
 =head1 DESCRIPTION
 
+For the most part, the only time you will ever encounter an
+instance of this class is if you are doing some serious deep
+introspection. This API should not be considered final, but
+it is B<highly unlikely> that this will matter to a regular
+Moose user.
+
+If you wish to use features at this depth, please come to the
+#moose IRC channel on irc.perl.org and we can talk :)
+
 =head1 METHODS
 
 =over 4
@@ -51,25 +253,73 @@ Moose::Meta::TypeConstraint - The Moose Type Constraint metaobject
 
 =item B<new>
 
+=item B<equals ($type_name_or_object)>
+
+=item B<is_a_type_of ($type_name_or_object)>
+
+This checks the current type name, and if it does not match,
+checks if it is a subtype of it.
+
+=item B<is_subtype_of ($type_name_or_object)>
+
+=item B<compile_type_constraint>
+
+=item B<coerce ($value)>
+
+This will apply the type-coercion if applicable.
+
+=item B<check ($value)>
+
+This method will return a true (C<1>) if the C<$value> passes the
+constraint, and false (C<0>) otherwise.
+
+=item B<validate ($value)>
+
+This method is similar to C<check>, but it deals with the error
+message. If the C<$value> passes the constraint, C<undef> will be
+returned. If the C<$value> does B<not> pass the constraint, then
+the C<message> will be used to construct a custom error message.
+
 =item B<name>
 
-=item B<check>
+=item B<parent>
 
-=item B<coerce>
+=item B<has_parent>
 
-=item B<coercion_code>
+=item B<parents>
 
-=item B<set_coercion_code>
+=item B<constraint>
 
-=item B<constraint_code>
+=item B<has_message>
+
+=item B<message>
+
+=item B<get_message ($value)>
 
 =item B<has_coercion>
 
+=item B<coercion>
+
+=item B<hand_optimized_type_constraint>
+
+=item B<has_hand_optimized_type_constraint>
+
+=back
+
+=head2 DEPRECATED METHOD
+
+=over 4
+
+=item B<union>
+
+This was just bad idea on my part,.. use the L<Moose::Meta::TypeConstraint::Union>
+itself instead.
+
 =back
 
 =head1 BUGS
 
-All complex software has bugs lurking in it, and this module is no 
+All complex software has bugs lurking in it, and this module is no
 exception. If you find a bug please either email me, or add the bug
 to cpan-RT.
 
@@ -79,11 +329,11 @@ Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
 
 L<http://www.iinteractive.com>
 
 This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself. 
+it under the same terms as Perl itself.
 
-=cut
\ No newline at end of file
+=cut