1 files changed, 14 insertions, 0 deletions
diff --git a/lib/puppet/parser/ast.rb b/lib/puppet/parser/ast.rb
index 2773a240e..54e034acb 100644
--- a/lib/puppet/parser/ast.rb
+++ b/lib/puppet/parser/ast.rb
@@ -87,6 +87,20 @@ class Puppet::Parser::AST
   def initialize(args)
     set_options(args)
   end
+
+  # evaluate ourselves, and match
+  def evaluate_match(value, scope)
+    obj = self.safeevaluate(scope)
+
+    obj   = obj.downcase   if obj.respond_to?(:downcase)
+    value = value.downcase if value.respond_to?(:downcase)
+
+    obj   = Puppet::Parser::Scope.number?(obj)   || obj
+    value = Puppet::Parser::Scope.number?(value) || value
+
+    # "" == undef for case/selector/if
+    obj == value or (obj == "" and value == :undef)
+  end
 end
 
 # And include all of the AST subclasses.