note description: "Comparators for character ranges" legal: "See notice at end of class." status: "See notice at end of class." date: "$Date$" revision: "$Revision$" class RANGE_COMPARATOR inherit COMPARATOR create make feature {NONE} -- Initialization make (lo, up: CHARACTER) -- Create comparator. do lower := lo upper := up ensure lower_set: lower = lo upper_set: upper = up end feature -- Access character_set: STRING -- Character set represented by comparator do create Result.make (3) Result.extend (lower) Result.extend ('-') Result.extend (upper) end contains (c: CHARACTER): BOOLEAN -- Does comparator contain `c'? do Result := lower <= c and c <= upper end feature {NONE} -- Implementation lower: CHARACTER upper: CHARACTER; note copyright: "Copyright (c) 1984-2006, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 356 Storke Road, Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class RANGE_COMPARATOR