char_range.rb in rley-0.6.01

- old
+ new
@@ -1,52 +1,51 @@
 # File: char_range.rb
 
-require_relative 'polyadic_expression'	# Access the superclass
+require_relative 'polyadic_expression' # Access the superclass
 
 module Regex # This module is used as a namespace
+  # A binary expression that represents a contiguous range of characters.
+  # Assumption: characters are ordered by codepoint
+  class CharRange < PolyadicExpression
+    # Constructor.
+    # [thelowerBound] 
+    #   A character that will be the lower bound value for the range.
+    # [theUpperBound] 
+    #   A character that will be the upper bound value for the range.
+    # TODO: optimisation. Build a Character if lower bound == upper bound.
+    def initialize(theLowerBound, theUpperBound)
+      range = validated_range(theLowerBound, theUpperBound)
+      super(range)
+    end
 
-# A binary expression that represents a contiguous range of characters.
-# Assumption: characters are ordered by codepoint
-class CharRange < PolyadicExpression
-	
-	# Constructor.
-	# [thelowerBound] A character that will be the lower bound value for the range.
-	# [theUpperBound] A character that will be the upper bound value for the range.
-	# TODO: optimisation. Build a Character if lower bound == upper bound.
-	def initialize(theLowerBound, theUpperBound)
-		range = validated_range(theLowerBound, theUpperBound)
-		super(range)
-	end
+    # Return the lower bound of the range.
+    def lower()
+      return children.first
+    end
 
-public
-	# Return the lower bound of the range.
-	def lower()
-		return children.first
-	end
-	
-	# Return the upper bound of the range.
-	def upper()
-		return children.last
-	end
+    # Return the upper bound of the range.
+    def upper()
+      return children.last
+    end
 
-  protected
+    protected
 
-	# Conversion method re-definition.
-	# Purpose: Return the String representation of the concatented expressions.
-	def text_repr()
-		result = lower.to_str() + '-' + upper.to_str()
-		
-		return result
-	end
+    # Conversion method re-definition.
+    # Purpose: Return the String representation of the concatented expressions.
+    def text_repr()
+      result = lower.to_str + '-' + upper.to_str
 
-private
-	# Validation method. Returns a couple of Characters.after their validation.
-	def validated_range(theLowerBound, theUpperBound)
-		raise StandardError, "Character range error: lower bound is greater than upper bound." if theLowerBound.codepoint > theUpperBound.codepoint
-		return [theLowerBound, theUpperBound]
-	end
+      return result
+    end
 
-end # class
+    private
 
+    # Validation method. Returns a couple of Characters.after their validation.
+    def validated_range(theLowerBound, theUpperBound)
+      msg = 'Character range error: lower bound is greater than upper bound.'
+      raise StandardError, msg if theLowerBound.codepoint > theUpperBound.codepoint
+      return [theLowerBound, theUpperBound]
+    end
+  end # class
 end # module
 
-# End of file
\ No newline at end of file
+# End of file