module Ruby # Logical Statements are guaranteed to return boolean # either :and or :or, which may be written as && and || # # Also they guarantee that the right expression does not get evaluated # if the whole expression fails on the left expression. # ie: false && non_existant_method # will never call the non_existant_method , but instead evaluate to false # # Vool has no concept of this, so the Statement is expanded into the if # that it really is class LogicalStatement < Statement attr_reader :name , :left , :right def initialize(name , left , right) @name , @left , @right = name , left , right end def to_s(depth = 0) at_depth(depth , "#{left} #{name} #{right}") end end end