note
	description: "Routines that ought to be in class ARRAY"
	library: "Gobo Eiffel Kernel Library"
	copyright: "Copyright (c) 1999-2018, Eric Bezault and others"
	license: "MIT License"
	date: "$Date: 2019-02-07 22:54:15 +0000 (Thu, 07 Feb 2019) $"
	revision: "$Revision: 102807 $"

class 
	KL_ARRAY_ROUTINES [G]

create 
	default_create

feature -- Initialization

	make_empty_with_lower (min_index: INTEGER_32): ARRAY [G]
			-- Create an empty array with min_index as lower bound.
		local
			l_array: KL_ARRAY [G]
		do
			if min_index = 1 then
				create Result.make_empty
			else
				create l_array.make_empty
				l_array.new_rebase (min_index)
				create Result.make_from_array (l_array)
			end
		ensure
			instance_free: class
			array_not_void: Result /= Void
			lower_set: Result.lower = min_index
			is_empty: Result.is_empty
		end

	make_from_array (an_array: ARRAY [G]; min_index: INTEGER_32): ARRAY [G]
			-- Create a new array and initialize it
			-- with items from an_array.
		require
			an_array_not_void: an_array /= Void
		do
			Result := subarray (an_array, an_array.lower, an_array.upper, min_index)
		ensure
			instance_free: class
			array_not_void: Result /= Void
			lower_set: Result.lower = min_index
			count_set: Result.count = an_array.count
			same_items: across
					Result.lower |..| Result.upper as i
				all
					{KL_TYPE [G]}.same_objects (Result.item (i.item), an_array.item (i.item + an_array.lower - min_index))
				end
		end
	
feature {NONE} -- Initialization

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

	Any_: KL_ANY_ROUTINES
			-- Routines that ought to be in class ANY
			-- (from KL_IMPORTED_ANY_ROUTINES)
		once
			create Result
		ensure -- from KL_IMPORTED_ANY_ROUTINES
			instance_free: class
			any_routines_not_void: Result /= Void
		end

	generating_type: TYPE [detachable KL_ARRAY_ROUTINES [G]]
			-- 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

	subarray (an_array: ARRAY [G]; start_pos, end_pos, min_index: INTEGER_32): ARRAY [G]
			-- Array made up of items from an_array within
			-- bounds start_pos and end_pos
			-- Reasons why we don't use ARRAY.subarray directly:
			-- * ELKS ARRAY 2000 returns an 'ARRAY [G]'
			--   whereas ISE 5.4/5.5 return a 'like Current'.
			-- * ISE 5.4/5.5 does not allow subarrays of empty array,
			--   and does not work with empty subarrays.
			-- * This routine has an extra argument min_index compared
			--   to the one provided by ELKS and the various compilers.
		require
			an_array_not_void: an_array /= Void
			start_pos_large_enough: start_pos >= an_array.lower
			end_pos_small_enough: end_pos <= an_array.upper
			valid_bounds: start_pos <= end_pos + 1
		do
			if end_pos < start_pos then
				Result := make_empty_with_lower (min_index)
			else
				create Result.make_filled (an_array.item (start_pos), min_index, min_index + end_pos - start_pos)
				subcopy (Result, an_array, start_pos, end_pos, min_index)
			end
		ensure
			instance_free: class
			array_not_void: Result /= Void
			lower_set: Result.lower = min_index
			count_set: Result.count = end_pos - start_pos + 1
			same_items: across
					Result.lower |..| Result.upper as i
				all
					{KL_TYPE [G]}.same_objects (Result.item (i.item), an_array.item (i.item + start_pos - min_index))
				end
		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 (other: KL_ARRAY_ROUTINES [G]): 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: KL_ARRAY_ROUTINES [G]): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		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 (other: KL_ARRAY_ROUTINES [G]): 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
	
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

	has (an_array: ARRAY [G]; v: G): BOOLEAN
			-- Does v appear in an_array (use '=' for item comparison).
			-- Reasons why we don't use ARRAY.has directly:
			-- * has is not in ELKS ARRAY 2000.
			-- * ISE may change this behavior with compare_objects.
		require
			an_array_not_void: an_array /= Void
		local
			i, nb: INTEGER_32
		do
			from
				i := an_array.lower
				nb := an_array.upper
			until
				i > nb
			loop
				if an_array.item (i) = v then
					Result := True
					i := nb + 1
				else
					i := i + 1
				end
			end
		ensure
			instance_free: class
		end

	has_void (a_array: ARRAY [G]): BOOLEAN
			-- Does 'Void' appear in an_array (use '=' for item comparison).
			-- Reason why we don't use has (Void) directly:
			-- * the actual generic parameter may be attached and
			--   'Void' would not conform to it.
		require
			a_array_not_void: a_array /= Void
		local
			i, nb: INTEGER_32
		do
			if attached {ARRAY [detachable G]} a_array as l_array then
				from
					i := l_array.lower
					nb := l_array.upper
				until
					i > nb
				loop
					if l_array.item (i) = Void then
						Result := True
						i := nb + 1
					else
						i := i + 1
					end
				end
			end
		ensure
			instance_free: class
		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

	subcopy (an_array: ARRAY [G]; other: ARRAY [G]; start_pos, end_pos, index_pos: INTEGER_32)
			-- Copy items of other within bounds start_pos and end_pos
			-- to an_array starting at index index_pos.
			-- Reasons why we don't use ARRAY.subcopy directly:
			-- * subcopy is not in ELKS ARRAY 2000.
		require
			an_array_not_void: an_array /= Void
			other_not_void: other /= Void
			not_same: an_array /= other
			start_pos_large_enough: start_pos >= other.lower
			end_pos_small_enough: end_pos <= other.upper
			valid_bounds: start_pos <= end_pos + 1
			index_pos_large_enough: index_pos >= an_array.lower
			enough_space: (an_array.upper - index_pos) >= (end_pos - start_pos)
		do
			if start_pos <= end_pos then
				an_array.subcopy (other, start_pos, end_pos, index_pos)
			end
		ensure
			instance_free: class
			copied: across
					0 |..| (end_pos - start_pos) as i
				all
					{KL_TYPE [G]}.same_objects (an_array.item (index_pos + i.item), other.item (start_pos + i.item))
				end
		end
	
feature -- Resizing

	resize (an_array: ARRAY [G]; min_index, max_index: INTEGER_32)
			-- Rearrange array so that it can accommodate
			-- indices down to min_index and up to max_index.
			-- Do not lose any previously entered item.
		require
			an_array_not_void: an_array /= Void
			valid_min_index: min_index <= an_array.lower
			valid_max_index: max_index >= an_array.upper
			has_default: ({G}).has_default
		do
			resize_with_default (an_array, ({G}).default, min_index, max_index)
		ensure
			instance_free: class
			lower_set: an_array.lower = min_index
			upper_set: an_array.upper = max_index
		end

	resize_with_default (an_array: ARRAY [G]; a_default_value: G; min_index, max_index: INTEGER_32)
			-- Rearrange array so that it can accommodate
			-- indices down to min_index and up to max_index.
			-- Do not lose any previously entered item.
		require
			an_array_not_void: an_array /= Void
			valid_min_index: min_index <= an_array.lower
			valid_max_index: max_index >= an_array.upper
		do
			if min_index <= max_index then
				an_array.conservative_resize_with_default (a_default_value, min_index, max_index)
			end
		ensure
			instance_free: class
			lower_set: an_array.lower = min_index
			upper_set: an_array.upper = max_index
		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

	cloned_array (an_array: ARRAY [G]): ARRAY [G]
			-- Clone of an_array
		require
			an_array_not_void: an_array /= Void
		do
			Result := an_array.twin
		ensure
			instance_free: class
			cloned_not_void: Result /= Void
			same_type: Any_.same_types (Result, an_array)
			is_equal: Result.is_equal (an_array)
		end

	copy (other: KL_ARRAY_ROUTINES [G])
			-- 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: KL_ARRAY_ROUTINES [G])
			-- 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: KL_ARRAY_ROUTINES [G]
			-- 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: KL_ARRAY_ROUTINES [G])
			-- 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: KL_ARRAY_ROUTINES [G]
			-- 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: KL_ARRAY_ROUTINES [G]
			-- 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 KL_ARRAY_ROUTINES [G]
		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 KL_ARRAY_ROUTINES [G]
			-- 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 -- 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
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		do
			if o /= Void then
				Io.put_string (o.out)
			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_8
			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: ")
				create l_exc
				l_msg.append (generating_type.name)
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
invariant
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

end -- class KL_ARRAY_ROUTINES

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