From bc9d5b9266e18d39ab5fd83db272bffde98c4161 Mon Sep 17 00:00:00 2001
From: Christoph Helma <helma@in-silico.ch>
Date: Wed, 19 Jun 2013 16:29:43 +0200
Subject: openbabel requirement removed. initial descriptor classes.

---
 lib/overwrite.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib/overwrite.rb')

diff --git a/lib/overwrite.rb b/lib/overwrite.rb
index 04de58d..b2382e0 100644
--- a/lib/overwrite.rb
+++ b/lib/overwrite.rb
@@ -28,6 +28,14 @@ class String
     downcase
   end
 
+  # convert strings to boolean values
+  # @return [TrueClass,FalseClass] true or false
+  def to_boolean
+    return true if self == true || self =~ (/(true|t|yes|y|1)$/i)
+    return false if self == false || self.nil? || self =~ (/(false|f|no|n|0)$/i)
+    bad_request_error "invalid value for Boolean: \"#{self}\""
+  end
+
   # encloses URI in text with with link tag
   # @return [String] new text with marked links
   def link_urls
-- 
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