note
	description: "Unicode characters, with comparison operations"
	assembly: "mscorlib"
	external_name: "System.UInt32"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2012-10-30 15:32:46 +0000 (Tue, 30 Oct 2012) $"
	revision: "$Revision: 92022 $"

frozen expanded class 
	CHARACTER_32

create 
	default_create,
	make_from_reference

convert
	make_from_reference ({CHARACTER_32_REF})

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	make_from_reference (v: CHARACTER_32_REF)
			-- Initialize Current with v.item.
			-- (from CHARACTER_32_REF)
		require -- from CHARACTER_32_REF
			v_not_void: v /= Void
		do
			set_item (v.item)
		ensure -- from CHARACTER_32_REF
			item_set: item = v.item
		end
	
feature -- Access

	code: INTEGER_32
			-- Associated integer value
		do
			Result := natural_32_code.as_integer_32
		end

	generating_type: TYPE [detachable CHARACTER_32]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end

	hash_code: INTEGER_32
			-- Hash code value
			-- (from CHARACTER_32_REF)
		do
			Result := natural_32_code.hash_code
		ensure -- from HASHABLE
			good_hash_value: Result >= 0
		end

	item: CHARACTER_32
			-- Unicode character value
			-- (from CHARACTER_32_REF)


	Max_unicode_value: NATURAL_32 = 1114109
			-- Maximum Unicode characters.
			-- (from CHARACTER_32_REF)

	Max_value: NATURAL_32 = 4294967295
			-- Bounds for integer representation of CHARACTER_32
			-- (from CHARACTER_32_REF)

	Min_value: NATURAL_32 = 0
			-- (from CHARACTER_32_REF)

	natural_32_code: NATURAL_32
			-- Associated natural value
		do
			Result := Precursor
		ensure -- from CHARACTER_32_REF
			natural_32_code_in_range: Result >= Min_value and Result <= Max_value
		end
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal alias "≡≡≡" (other: CHARACTER_32): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: CHARACTER_32): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object and identical to it?
			-- (from CHARACTER_32_REF)
		require -- from ANY
			other_not_void: other /= Void
		do
			Result := other.item = item
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		ensure then -- from COMPARABLE
			trichotomy: Result = (not (Current < other) and not (other < Current))
		end

	is_greater alias ">" (other: CHARACTER_32): BOOLEAN
			-- 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

	is_greater_equal alias ">=" alias "≥" (other: CHARACTER_32): BOOLEAN
			-- 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

	is_less alias "<" (other: CHARACTER_32): BOOLEAN
			-- Is other greater than current character?
			-- (from CHARACTER_32_REF)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := natural_32_code < other.natural_32_code
		ensure then -- from COMPARABLE
			asymmetric: Result implies not (other < Current)
		ensure then -- from CHARACTER_32_REF
			definition: Result = (natural_32_code < other.natural_32_code)
		end

	is_less_equal alias "<=" alias "≤" (other: CHARACTER_32): BOOLEAN
			-- 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 (Current ~ other))
		end

	max alias "∨" (other: CHARACTER_32): CHARACTER_32
			-- 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 alias "∧" (other: CHARACTER_32): CHARACTER_32
			-- 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

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal alias "≜" (other: CHARACTER_32): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end

	three_way_comparison alias "⋚" (other: CHARACTER_32): INTEGER_32
			-- If current object equal to other, 0;
			-- if smaller, -1; if greater, 1
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current < other then
				Result := -1
			elseif other < Current then
				Result := 1
			end
		ensure -- from COMPARABLE
			equal_zero: (Result = 0) = (Current ~ other)
			smaller_negative: (Result = -1) = (Current < other)
			greater_positive: (Result = 1) = (Current > other)
		end
	
feature -- Status report

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	is_alpha: BOOLEAN
			-- Is item alphabetic?
			-- Alphabetic is is_upper or is_lower.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_alpha (item)
		end

	is_alpha_numeric: BOOLEAN
			-- Is item alphabetic or a digit?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_alpha (item) or Properties.is_digit (item)
		end

	is_character_8: BOOLEAN
			-- Can current be represented on a CHARACTER_8?
			-- (from CHARACTER_32_REF)
		do
			Result := natural_32_code <= {CHARACTER_8}.max_value.to_natural_32
		end

	is_control: BOOLEAN
			-- Is item a control character?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_control (item)
		end

	is_digit: BOOLEAN
			-- Is item a decimal digit as expected for ASCII characters?
			-- A digit is one of 0123456789.
			-- (from CHARACTER_32_REF)
		do
			Result := '0'.to_character_32 <= item and item <= '9'.to_character_32
		end

	is_hashable: BOOLEAN
			-- May current object be hashed?
			-- (True by default.)
			-- (from HASHABLE)
		do
			Result := True
		end

	is_hexa_digit: BOOLEAN
			-- Is item a hexadecimal digit as expected for ASCII characters?
			-- A digit is one of 0123456789ABCDEFabcedf.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_hexa_digit (item)
		end

	is_lower: BOOLEAN
			-- Is item lowercase?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_lower (item)
		end

	is_punctuation: BOOLEAN
			-- Is item a punctuation?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_punctuation (item)
		end

	is_space: BOOLEAN
			-- Is item a white space?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_space (item)
		end

	is_unicode_digit: BOOLEAN
			-- Is item a decimal digit as expected for Unicode characters?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_digit (item)
		end

	is_upper: BOOLEAN
			-- Is item uppercase?
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.is_upper (item)
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature -- Element change

	set_item (c: CHARACTER_32)
			-- Make c the item value.
			-- (from CHARACTER_32_REF)
		do
			item := c
		end
	
feature -- Conversion

	as_lower: CHARACTER_32
			-- Lowercase value of item.
			-- Returns item if not is_upper.
			-- Was declared in CHARACTER_32_REF as synonym of lower.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.to_lower (item)
		end

	as_upper: CHARACTER_32
			-- Uppercase value of item.
			-- Returns item if not is_lower.
			-- Was declared in CHARACTER_32_REF as synonym of upper.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.to_upper (item)
		end

	lower: CHARACTER_32
			-- Lowercase value of item.
			-- Returns item if not is_upper.
			-- Was declared in CHARACTER_32_REF as synonym of as_lower.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.to_lower (item)
		end

	to_character_32: CHARACTER_32
			-- Convert current to CHARACTER_32.
			-- (from CHARACTER_32_REF)
		do
			Result := item
		end

	to_character_8: CHARACTER_8
			-- Convert current to CHARACTER_8
		require -- from CHARACTER_32_REF
			is_character_8_compatible: is_character_8
		do
			Result := Precursor
		end

	to_reference: CHARACTER_32_REF
			-- Associated reference of Current.
			-- (from CHARACTER_32_REF)
		do
			create Result;
			Result.set_item (item)
		ensure -- from CHARACTER_32_REF
			to_reference_not_void: Result /= Void
		end

	upper: CHARACTER_32
			-- Uppercase value of item.
			-- Returns item if not is_lower.
			-- Was declared in CHARACTER_32_REF as synonym of as_upper.
			-- (from CHARACTER_32_REF)
		do
			Result := Properties.to_upper (item)
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: CHARACTER_32)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: CHARACTER_32)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: CHARACTER_32
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: CHARACTER_32)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: CHARACTER_32
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: CHARACTER_32
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached CHARACTER_32
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable CHARACTER_32
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature {NONE} -- Implementation

	Properties: CHARACTER_PROPERTY
			-- Property for Unicode characters.
			-- (from CHARACTER_32_REF)
		once
			create Result.make
		end
	
feature -- Basic routines

	difference alias "|-|" (other: CHARACTER_32): INTEGER_64
			-- Difference between the codes of item and other.
			-- (from CHARACTER_32_REF)
		do
			Result := item.natural_32_code.to_integer_64 - other.natural_32_code.to_integer_64
		ensure -- from CHARACTER_32_REF
			valid_non_negative_result: Result >= 0 implies ((other + Result.to_natural_32) = item)
			valid_negative_result: Result < 0 implies (other = (item + Result.to_natural_32))
		end

	minus alias "-" alias "−" (decr: NATURAL_32): CHARACTER_32
			-- Subtract decr from the code of item.
			-- (from CHARACTER_32_REF)
		require -- from CHARACTER_32_REF
			valid_decrement: (item.natural_32_code.to_integer_64 - decr.to_integer_64).is_valid_character_32_code
		do
			Result := (item.natural_32_code - decr).to_character_32
		ensure -- from CHARACTER_32_REF
			valid_result: item |-| Result = decr.to_integer_64
		end

	next: CHARACTER_32
			-- Next character.
			-- (from CHARACTER_32_REF)
		require -- from CHARACTER_32_REF
			valid_character: (item.natural_32_code.to_natural_64 + 1).is_valid_character_32_code
		do
			Result := item + 1
		ensure -- from CHARACTER_32_REF
			valid_result: Result |-| item = 1
		end

	plus alias "+" (incr: NATURAL_32): CHARACTER_32
			-- Add incr to the code of item.
			-- (from CHARACTER_32_REF)
		require -- from CHARACTER_32_REF
			valid_increment: (item.natural_32_code.to_natural_64 + incr.to_natural_64).is_valid_character_32_code
		do
			Result := (item.natural_32_code + incr).to_character_32
		ensure -- from CHARACTER_32_REF
			valid_result: Result |-| item = incr.to_integer_64
		end

	previous: CHARACTER_32
			-- Previous character.
			-- (from CHARACTER_32_REF)
		require -- from CHARACTER_32_REF
			valid_character: (item.natural_32_code.to_natural_64 - 1).is_valid_character_32_code
		do
			Result := item - 1
		ensure -- from CHARACTER_32_REF
			valid_result: Result |-| item = -1
		end
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result;
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- Printable representation of wide character.
			-- (from CHARACTER_32_REF)
		do
			create Result.make (6);
			Result.append_character ('U');
			Result.append_character ('+');
			Result.append_string (natural_32_code.to_hex_string)
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		local
			s: READABLE_STRING_8
		do
			if attached o then
				s := o.out
				if attached {READABLE_STRING_32} s as s32 then
					Io.put_string_32 (s32)
				elseif attached {READABLE_STRING_8} s as s8 then
					Io.put_string (s8)
				else
					Io.put_string_32 (s.as_string_32)
				end
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_32
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ".as_string_32)
				create l_exc;
				l_msg.append (generating_type.name_32);
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
invariant
		-- from COMPARABLE
	irreflexive_comparison: not (Current < Current)

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

note
	copyright: "Copyright (c) 1984-2012, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., 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 CHARACTER_32

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