indexing
	description:
		"Comparators for character ranges"

	status:	"See note at end of class"
	date: "$Date$"
	revision: "$Revision$"

class RANGE_COMPARATOR inherit

	COMPARATOR

create

	make

feature {NONE} -- Initialization

	make (lo, up: CHARACTER) is
			-- Create comparator.
		do
			lower := lo
			upper := up
		ensure
			lower_set: lower = lo
			upper_set: upper = up
		end

feature -- Access

	character_set: STRING is
			-- Character set represented by comparator
		do
			create Result.make (3)
			Result.extend (lower)
			Result.extend ('-')
			Result.extend (upper)
		end

	contains (c: CHARACTER): BOOLEAN is
			-- Does comparator contain `c'?
		do
			Result := lower <= c and c <= upper
		end
		
feature {NONE} -- Implementation

	lower: CHARACTER
	
	upper: CHARACTER

end -- class RANGE_COMPARATOR

--|----------------------------------------------------------------
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