From a0441cc7f68abcde11eb8fc6111c8d0fb9f925a8 Mon Sep 17 00:00:00 2001
From: makoto kuwata <kwa@kuwata-lab.com>
Date: Mon, 21 Mar 2011 09:47:05 +0900
Subject: [enhance] add 'lib/erubis/util.rb' which contains
 'Kernel#not_implemented()'

---
 lib/erubis.rb      |  1 +
 lib/erubis/util.rb | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 lib/erubis/util.rb

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
-- 
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