lib/citeproc/number.rb in citeproc-1.0.0.pre12 vs lib/citeproc/number.rb in citeproc-1.0.0

@@ -1,24 +1,26 @@
+# -*- encoding: utf-8 -*-
+
 module CiteProc
   # A CiteProc Variable used for numeric values.
   class Number < Variable
 
-	  MAX_ROMAN = 5000
+    MAX_ROMAN = 5000
 
     FACTORS = [
       ['m', 1000], ['cm', 900], ['d', 500], ['cd', 400],
       ['c',  100], ['xc',  90], ['l',  50], ['xl',  40],
       ['x',   10], ['ix',   9], ['v',   5], ['iv',   4],
       ['i',    1]
     ].freeze
 
-		class << self
-			def pluralize?(string)
-				/\S\s*[,&-]\s*\S|\df/ === string
-			end
-			
-			# @param number [#to_i] the number to convert
+    class << self
+      def pluralize?(string)
+        /\S[\s,&–-]\S|\df/ === string
+      end
+
+      # @param number [#to_i] the number to convert
       # @return [String] roman equivalent of the passed-in number
       def romanize(number)
         number, roman = number.to_i, ''
 
         return number unless number > 0 || number < MAX_ROMAN
@@ -28,9 +30,26 @@
           roman << (code * count)
         end
 
         roman
       end
-		end
+    end
+
+    def <=>(other)
+      case
+      when other.nil?
+        1
+      when numeric?
+        if other.respond_to?(:to_i)
+          to_i <=> other.to_i
+        else
+          nil
+        end
+      when other.is_a?(Variable) || other.is_a?(String)
+        to_s <=> other.to_s
+      else
+        nil
+      end
+    end
   end
 
 end