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	description: "Characters, with comparison operations and an ASCII code"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

expanded class 
	CHARACTER

feature -- Access

	code: INTEGER is
			-- Associated integer value
			-- (from CHARACTER_REF)
		do
			Result := chcode (item)
		end

	hash_code: INTEGER is
			-- Hash code value
			-- (from CHARACTER_REF)
		do
			Result := code
		ensure -- from HASHABLE
			good_hash_value: Result >= 0
		end

	item: CHARACTER
			-- Character value
			-- (from CHARACTER_REF)
	
feature -- Comparison

	is_equal (other: like Current): BOOLEAN is
			-- Is other attached to an object of the same type
			-- as current object and identical to it?
			-- (from CHARACTER_REF)
		require -- from ANY
			other_not_void: other /= void
		do
			Result := other.item = item
		ensure -- from ANY
			symmetric: Result implies other.is_equal (Current)
			consistent: standard_is_equal (other) implies Result
		ensure then -- from COMPARABLE
			trichotomy: Result = (not (Current < other) and not (other < Current))
		end

	max (other: like Current): like Current is
			-- The greater of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= void
		do
			if Current >= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_smaller: Current >= other implies Result = Current
			other_if_smaller: Current < other implies Result = other
		end

	min (other: like Current): like Current is
			-- The smaller of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= void
		do
			if Current <= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_greater: Current <= other implies Result = Current
			other_if_greater: Current > other implies Result = other
		end

	three_way_comparison (other: CHARACTER_REF): INTEGER is
			-- If current object equal to other, 0;
			-- if smaller, -1; if greater, 1
			-- (from CHARACTER_REF)
		require -- from COMPARABLE
			other_exists: other /= void
		do
			if item < other.item then
				Result := - 1
			elseif other.item < item then
				Result := 1
			end
		ensure -- from COMPARABLE
			equal_zero: (Result = 0) = is_equal (other)
			smaller_negative: (Result = - 1) = (Current < other)
			greater_positive: (Result = 1) = (Current > other)
		end

	infix "<" (other: like Current): BOOLEAN is
			-- Is other greater than current character?
			-- (from CHARACTER_REF)
		require -- from PART_COMPARABLE
			other_exists: other /= void
		do
			Result := item < other.item
		ensure then -- from COMPARABLE
			asymmetric: Result implies not (other < Current)
		ensure then -- from CHARACTER_REF
			definition: Result = (code < other.code)
		end

	infix "<=" (other: like Current): BOOLEAN is
			-- Is current object less than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= void
		do
			Result := not (other < Current)
		ensure then -- from COMPARABLE
			definition: Result = ((Current < other) or is_equal (other))
		end

	infix ">" (other: like Current): BOOLEAN is
			-- Is current object greater than other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= void
		do
			Result := other < Current
		ensure then -- from COMPARABLE
			definition: Result = (other < Current)
		end

	infix ">=" (other: like Current): BOOLEAN is
			-- Is current object greater than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= void
		do
			Result := not (Current < other)
		ensure then -- from COMPARABLE
			definition: Result = (other <= Current)
		end
	
feature -- Status report

	is_alpha: BOOLEAN is
			-- Is item alphabetic?
			-- Alphabetic is is_upper or is_lower
			-- (from CHARACTER_REF)
		do
			Result := chis_alpha (item)
		end

	is_digit: BOOLEAN is
			-- Is item a digit?
			-- A digit is one of 0123456789
			-- (from CHARACTER_REF)
		do
			Result := chis_digit (item)
		end

	is_hashable: BOOLEAN is
			-- May current object be hashed?
			-- (True if it is not its type's default.)
			-- (from CHARACTER_REF)
		do
			Result := item /= '%U'
		ensure -- from HASHABLE
			ok_if_not_default: Result implies (Current /= default)
		end

	is_lower: BOOLEAN is
			-- Is item lowercase?
			-- (from CHARACTER_REF)
		do
			Result := chis_lower (item)
		end

	is_upper: BOOLEAN is
			-- Is item uppercase?
			-- (from CHARACTER_REF)
		do
			Result := chis_upper (item)
		end
	
feature -- Element change

	set_item (c: CHARACTER) is
			-- Make c the item value.
			-- (from CHARACTER_REF)
		do
			item := c
		end
	
feature -- Conversion

	lower: CHARACTER is
			-- Lowercase value of item
			-- Returns item if not is_upper
			-- (from CHARACTER_REF)
		do
			Result := chlower (item)
		end

	upper: CHARACTER is
			-- Uppercase value of item
			-- Returns item if not is_lower
			-- (from CHARACTER_REF)
		do
			Result := chupper (item)
		end
	
feature {NONE} -- Implementation

	c_outc (c: CHARACTER): STRING is
			-- Printable representation of character
			-- (from CHARACTER_REF)
		external
			"C | %"eif_out.h%""
		end

	chcode (c: like item): INTEGER is
			-- Associated integer value
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chconv (i: INTEGER): CHARACTER is
			-- Character associated with integer value i
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chis_alpha (c: CHARACTER): BOOLEAN is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chis_digit (c: CHARACTER): BOOLEAN is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chis_lower (c: CHARACTER): BOOLEAN is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chis_upper (c: CHARACTER): BOOLEAN is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chlower (c: CHARACTER): CHARACTER is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end

	chupper (c: CHARACTER): CHARACTER is
			-- (from CHARACTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		end
	
feature -- Basic routines

	next: CHARACTER is
			-- Next character
			-- (from CHARACTER_REF)
		require -- from CHARACTER_REF
			valid_character: item /= 'ÿ'
		do
			Result := item + 1
		ensure -- from CHARACTER_REF
			valid_result: Result |-| item = 1
		end

	previous: CHARACTER is
			-- Previous character
			-- (from CHARACTER_REF)
		require -- from CHARACTER_REF
			valid_character: item /= '%U'
		do
			Result := item - 1
		ensure -- from CHARACTER_REF
			valid_result: Result |-| item = - 1
		end

	infix "+" (incr: INTEGER): CHARACTER is
			-- Add incr to the code of item
			-- (from CHARACTER_REF)
		require -- from CHARACTER_REF
			valid_upper_increment: item.code + incr <= 255
			valid_lower_increment: item.code + incr >= 0
		do
			Result := chconv (chcode (item) + incr)
		ensure -- from CHARACTER_REF
			valid_result: Result |-| item = incr
		end

	infix "-" (decr: INTEGER): CHARACTER is
			-- Subtract decr to the code of item
			-- (from CHARACTER_REF)
		require -- from CHARACTER_REF
			valid_upper_decrement: item.code - decr <= 255
			valid_lower_decrement: item.code - decr >= 0
		do
			Result := chconv (chcode (item) - decr)
		ensure -- from CHARACTER_REF
			valid_result: item |-| Result = decr
		end

	infix "|-|" (other: CHARACTER): INTEGER is
			-- Difference between the codes of item and other
			-- (from CHARACTER_REF)
		do
			Result := chcode (item) - chcode (other)
		ensure -- from CHARACTER_REF
			valid_result: other + Result = item
		end
	
feature -- Output

	out: STRING is
			-- Printable representation of character
			-- (from CHARACTER_REF)
		do
			Result := c_outc (item)
		end
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)
		-- from COMPARABLE
	irreflexive_comparison: not (Current < Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class CHARACTER


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