1 files changed, 25 insertions, 4 deletions
diff --git a/lib/Tree/Transform/XSLTish.pm b/lib/Tree/Transform/XSLTish.pm
index 3889b3a..97a6f1f 100644
--- a/lib/Tree/Transform/XSLTish.pm
+++ b/lib/Tree/Transform/XSLTish.pm
@@ -9,12 +9,15 @@ use Carp::Clan qw(^Tree::Transform::XSLTish);
 
 our $VERSION='0.1';
 
+my @DEFAULT_EXPORTS=('tree_rule',
+                     'default_rules',
+                     'new_transformer' => {-as => 'new'});
+
 Sub::Exporter::setup_exporter({
-    exports => [qw(tree_rule default_rules new_transformer)],
+    exports => [qw(tree_rule default_rules new_transformer engine_class engine_factory)],
     groups => {
-        default => [ 'tree_rule',
-                     'default_rules',
-                     'new_transformer' => {-as => 'new'} ],
+        default => \@DEFAULT_EXPORTS,
+        engine => [@DEFAULT_EXPORTS, qw(engine_class engine_factory)],
     }
 });
 
@@ -55,6 +58,24 @@ sub tree_rule {
     return;
 }
 
+sub engine_class {
+    my ($classname)=@_;
+
+    my $factory=Tree::Transform::XSLTish::Utils::_engine_factory(scalar caller);
+    $$factory=sub{$classname->new()};
+
+    return;
+}
+
+sub engine_factory {
+    my ($new_factory)=@_;
+
+    my $factory=Tree::Transform::XSLTish::Utils::_engine_factory(scalar caller);
+    $$factory=$new_factory;
+
+    return;
+}
+
 sub _transformer_class { 'Tree::Transform::XSLTish::Transformer' };
 
 sub new_transformer {