[enhance] add 'lib/erubis/util.rb' which contains 'Kernel#not_implemented()'

2 files changed, 23 insertions, 0 deletions

diff --git a/lib/erubis.rb b/lib/erubis.rb
index 0c2071b..92d6507 100644
--- a/lib/erubis.rb
+++ b/lib/erubis.rb
@@ -56,6 +56,7 @@ require 'erubis/engine'
 #require 'erubis/evaluator'
 #require 'erubis/error'
 #require 'erubis/context'
+#requier 'erubis/util'
 require 'erubis/helper'
 require 'erubis/enhancer'
 #require 'erubis/tiny'
diff --git a/lib/erubis/util.rb b/lib/erubis/util.rb
new file mode 100644
index 0000000..d1611ce
--- /dev/null
+++ b/lib/erubis/util.rb
@@ -0,0 +1,22 @@
+##
+## $Release:$
+## $Copyright$
+##
+
+module Kernel
+
+  ##
+  ## raise NotImplementedError
+  ##
+  def not_implemented     #:doc:
+    backtrace = caller()
+    method_name = (backtrace.shift =~ /`(\w+)'$/) && $1
+    mesg = "class #{self.class.name} must implement abstract method '#{method_name}()'."
+    #mesg = "#{self.class.name}##{method_name}() is not implemented."
+    err = NotImplementedError.new mesg
+    err.set_backtrace backtrace
+    raise err
+  end
+  private :not_implemented
+
+end