StringDate.rb

require "date"

class StringDate
	attr_reader :description,:date
	
	@@PREDEFINED_DATES={"yesterday"=>lambda{Date.today-1}, "tomorrow"=>lambda{Date.today+1}, "today"=>lambda{Date.today}}
	@@PREDEFINED_RANGES={"this_week"=>(Date.today..Date.today+7)}
	
	def initialize(string)
		if(@@PREDEFINED_DATES.has_key?(string))
			@date=@@PREDEFINED_DATES[string].call
		else
			@date=Date.strptime(string, '%d/%m/%Y')
		end
	end
	def to_s
		if (@date== Date.today)
			return "today"
		elsif (@date==(Date.today+1))
			return "tomorrow"
		elsif (@date==(Date.today-1))
			return "yesterday"
		else
			return @date.strftime('%d/%m/%Y')
		end
	end
	def ==(other)
		@date==other.date
	end
	def <=>(other)
		@date<=>other.date
	end
	def is_in?(range)
		if(@@PREDEFINED_RANGES.has_key?(range))
			return @@PREDEFINED_RANGES[range] === @date
		end
		range===@date
	end
end