lib/httpthumbnailer/thumbnail_specs.rb in httpthumbnailer-0.0.3 vs lib/httpthumbnailer/thumbnail_specs.rb in httpthumbnailer-0.0.4

@@ -1,17 +1,23 @@
 require 'httpthumbnailer/thumbnailer'
 
 class ThumbnailSpecs < Array
+	class BadThubnailSpecFormat < ArgumentError
+	end
+
 	def self.from_uri(specs)
 		ts = ThumbnailSpecs.new
 		specs.split('/').each do |spec|
 			method, width, height, format, *options = *spec.split(',')
+			raise BadThubnailSpecFormat, "missing argument in: #{spec}" unless method and width and height and format
+
 			width = width.to_i
 			height = height.to_i
 
 			opts = {}
 			options.each do |option|
 				key, value = option.split(':')
+				raise BadThubnailSpecFormat, "missing option key or value in: #{option}" unless key and value
 				opts[key] = value
 			end
 
 			ts << ThumbnailSpec.new(method, width, height, format, opts)
 		end