Allow passing a type constraint as the parent to LT::Meta::TypeConstraint::Autocoerce

[perl/modules/LaTeX-TikZ.git] / lib / LaTeX / TikZ / Meta / TypeConstraint / Autocoerce.pm

diff --git a/lib/LaTeX/TikZ/Meta/TypeConstraint/Autocoerce.pm b/lib/LaTeX/TikZ/Meta/TypeConstraint/Autocoerce.pm
index 4706998ef34e0610da97cdbf8da8073b55584ff8..9c65f364c181cbcd19bfdbeed1e4802ef2e74f49 100644 (file)
--- a/lib/LaTeX/TikZ/Meta/TypeConstraint/Autocoerce.pm
+++ b/lib/LaTeX/TikZ/Meta/TypeConstraint/Autocoerce.pm
@@ -15,92 +15,124 @@ Version 0.01
 
 our $VERSION = '0.01';
 
+use Scalar::Util qw/blessed/;
+
 use Sub::Name ();
 
 use Any::Moose;
+use Any::Moose 'Util' => [ 'find_meta' ];
 
 extends any_moose('Meta::TypeConstraint');
 
+=head1 ATTRIBUTES
+
+=head2 C<mapper>
+
+=cut
+
 has 'mapper' => (
  is  => 'ro',
  isa => 'CodeRef',
 );
 
-has 'parent_name' => (
+=head2 C<parent>
+
+=cut
+
+has 'parent' => (
  is       => 'ro',
- isa      => 'ClassName',
+ isa      => any_moose('Meta::TypeConstraint'),
  required => 1,
 );
 
+=head2 C<user_constraint>
+
+=cut
+
 has 'user_constraint' => (
  is       => 'ro',
  isa      => 'Maybe[CodeRef]',
  required => 1,
 );
 
+=head1 METHODS
+
+=cut
+
 around 'new' => sub {
  my ($orig, $class, %args) = @_;
 
  unless (exists $args{mapper}) {
-  $args{mapper} = sub { join '::', $_[0]->parent_name, $_[1] };
+  $args{mapper} = sub { join '::', $_[0]->parent->name, $_[1] };
  }
 
  my $parent = delete $args{parent};
- $args{parent_name} = defined $parent
-                      ? (blessed($parent) ? $parent->name : $parent)
-                      : '__ANON__';
+ unless (blessed $parent) {
+  $parent = find_meta($parent)->type_constraint;
+ }
+ __PACKAGE__->meta->find_attribute_by_name('parent')
+                  ->type_constraint->assert_valid($parent);
+ $args{parent} = $parent;
 
- $args{user_constraint} = $args{constraint};
+ $args{user_constraint} = delete $args{constraint};
 
  if (any_moose() eq 'Moose') {
   $args{coercion} = Moose::Meta::TypeCoercion->new;
  }
 
- my $parent_name = $args{parent_name};
- $parent_name =~ s/::+/_/g;
-
  my $tc;
- $args{constraint} = Sub::Name::subname("${parent_name}_load" => sub {
-  my ($thing) = @_;
+ $args{constraint} = Sub::Name::subname('_load' => sub {
+  $tc->load(@_);
+ });
 
-  # First, try a possible user defined constraint
-  my $user = $tc->user_constraint;
-  if (defined $user) {
-   my $ok = $user->($thing);
-   return 1 if $ok;
-  }
+ $tc = $class->$orig(%args);
+};
 
-  # When ->check is called inside coerce, a return value of 0 means that
-  # coercion should take place, while 1 signifies that the value is already
-  # OK.
+=head2 C<load>
 
-  my $class = blessed($thing);
-  return 0 unless $class;
-  return 1 if     $class->isa($tc->parent_name);
+=cut
 
-  my $mapper = $tc->mapper;
-  my $pm = $class = $tc->$mapper($class);
+sub load {
+ my ($tc, $thing) = @_;
 
-  $pm =~ s{::}{/}g;
-  $pm .= '.pm';
-  return 0 if $INC{$pm}; # already loaded
+ # When ->check is called inside coerce, a return value of 0 means that
+ # coercion should take place, while 1 signifies that the value is already
+ # OK.
 
-  local $@;
-  eval { require $pm; 1 };
+ # First, try a possible user defined constraint
+ my $user = $tc->user_constraint;
+ if (defined $user) {
+  my $ok = $user->($thing);
+  return 1 if $ok;
+ }
 
-  return 0;
- });
+ # Then, try the parent constraint
+ return 1 if $tc->parent->check($thing);
 
- $tc = $class->$orig(%args);
-};
+ # If $thing isn't even an object, don't bother trying to coerce it
+ my $class = blessed($thing);
+ return 0 unless defined $class;
+
+ # Find the file to autoload
+ my $mapper = $tc->mapper;
+ my $pm = $class = $tc->$mapper($class);
+ $pm =~ s{::}{/}g;
+ $pm .= '.pm';
+ return 0 if $INC{$pm}; # already loaded
+
+ local $@;
+ eval { require $pm; 1 };
+
+ return 0;
+}
 
 around 'coerce' => sub {
  my ($orig, $tc, $thing) = @_;
 
  # The original coerce gets an hold onto the type coercions *before* calling
  # the constraint. Thus, we have to force the loading before recalling into
- # $orig. This is achieved by calling ->check.
- return $thing if $tc->check($thing);
+ # $orig. This is achieved by calling ->load.
+ return $thing if $tc->load($thing);
 
  $tc->$orig($thing);
 };