Add ability to turn unicode regexes into strings.

lib/twitter_cldr/parsers/unicode_regex/character_class.rb

@@ -14,7 +14,7 @@ class CharacterClass < Component
           close_bracket: :open_bracket
         }
 
-        # Character classes can include set operations (eg. union, intersection, etc).      
+        # Character classes can include set operations (eg. union, intersection, etc).
         BinaryOperator = Struct.new(:operator, :left, :right)
         UnaryOperator = Struct.new(:operator, :child)
 
@@ -50,10 +50,34 @@ def to_set
           evaluate(root)
         end
 
+        def to_s
+          stringify(root)
+        end
+
         private
 
         attr_reader :root
 
+        def stringify(node)
+          case node
+            when UnaryOperator, BinaryOperator
+              op_str = case node.operator
+                when :negate then '^'
+                when :union, :pipe then ''
+                when :dash then '-'
+                when :ampersand then '&'
+              end
+
+              left = stringify(node.left)
+              right = stringify(node.right)
+
+              "#{left}#{op_str}#{right}"
+
+            else
+              node.to_s
+          end
+        end
+
         def evaluate(node)
           case node
             when UnaryOperator, BinaryOperator

lib/twitter_cldr/parsers/unicode_regex/character_range.rb

@@ -33,6 +33,10 @@ def to_set
           )
         end
 
+        def to_s
+          "#{initial.to_s}-#{final.to_s}"
+        end
+
       end
     end
   end

lib/twitter_cldr/parsers/unicode_regex/character_set.rb

@@ -32,6 +32,14 @@ def to_set
           )
         end
 
+        def to_s
+          if property_value
+            "[:#{property_name}=#{property_value}:]"
+          else
+            "[:#{property_name}:]"
+          end
+        end
+
         private
 
         def codepoints

lib/twitter_cldr/parsers/unicode_regex/literal.rb

@@ -56,6 +56,10 @@ def to_set
           end
         end
 
+        def to_s
+          text
+        end
+
         private
 
         def set_for_special_char(char)

lib/twitter_cldr/parsers/unicode_regex/unicode_string.rb

@@ -31,11 +31,14 @@ def to_set
         end
 
         def to_regexp_str
-          cps = codepoints.is_a?(Array) ? codepoints : [codepoints]
-          array_to_regex(cps)
+          array_to_regex(Array(codepoints))
+        end
+
+        def to_s
+          to_regexp_str
         end
 
       end
     end
   end
-end
+end

lib/twitter_cldr/shared/unicode_regex.rb

@@ -68,6 +68,12 @@ def to_regexp_str
         @regexp_str ||= elements.map(&:to_regexp_str).join
       end
 
+      def to_s
+        @elements.inject('') do |ret, element|
+          ret + element.to_s
+        end
+      end
+
     end
   end
 end