note
	description: "[
		Access to internal object properties.
		This class may be used as ancestor by classes needing its facilities.
	]"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2020-05-19 14:25:56 +0000 (Tue, 19 May 2020) $"
	revision: "$Revision: 104258 $"

class 
	REFLECTOR

create 
	default_create

feature {NONE} -- Initialization

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

	attached_type (type_id: INTEGER_32): INTEGER_32
			-- Attached version of type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.attached_type (type_id)
		ensure
			instance_free: class
			unchanged_if_attached: is_attached_type (type_id) implies type_id = Result
		end

	Bit_type: INTEGER_32 = 8
			-- This type is obsolete and is not used anymore.
			-- (from REFLECTOR_CONSTANTS)

	Boolean_type: INTEGER_32 = 3
			-- Abstract type ID for predefined type BOOLEAN.
			-- (from REFLECTOR_CONSTANTS)

	Character_32_type: INTEGER_32 = 12
			-- Abstract type ID for predefined type CHARACTER_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Wide_character_type.
			-- (from REFLECTOR_CONSTANTS)

	Character_8_type: INTEGER_32 = 2
			-- Abstract type ID for predefined type CHARACTER_8.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Character_type.
			-- (from REFLECTOR_CONSTANTS)

	Character_type: INTEGER_32 = 2
			-- Abstract type ID for predefined type CHARACTER_8.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Character_8_type.
			-- (from REFLECTOR_CONSTANTS)

	class_name_8_of_type (type_id: INTEGER_32): STRING_8
			-- Name of class associated with dynamic type type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.generator_8_of_type (type_id)
		ensure
			instance_free: class
		end

	class_name_of_type (type_id: INTEGER_32): STRING_8
			-- Name of class associated with dynamic type type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.generator_of_type (type_id)
		ensure
			instance_free: class
		end

	detachable_type (type_id: INTEGER_32): INTEGER_32
			-- Detachable version of type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.detachable_type (type_id)
		ensure
			instance_free: class
			unchanged_if_detachable: not is_attached_type (type_id) implies type_id = Result
		end

	Double_type: INTEGER_32 = 6
			-- Abstract type ID for predefined type REAL_64.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Real_64_type.
			-- (from REFLECTOR_CONSTANTS)

	Expanded_type: INTEGER_32 = 7
			-- Abstract type ID for a non-predefined expanded type.
			-- (from REFLECTOR_CONSTANTS)

	field_name_8_of_type (i: INTEGER_32; type_id: INTEGER_32): STRING_8
			-- Name of i-th field of dynamic type type_id.
		require
			type_id_nonnegative: type_id >= 0
			index_large_enough: i >= 1
			index_small_enought: i <= field_count_of_type (type_id)
		do
			create Result.make_from_c ({ISE_RUNTIME}.field_name_of_type (i, type_id))
		ensure
			instance_free: class
		end

	field_name_of_type (i: INTEGER_32; type_id: INTEGER_32): STRING_8
			-- Name of i-th field of dynamic type type_id.
		require
			type_id_nonnegative: type_id >= 0
			index_large_enough: i >= 1
			index_small_enought: i <= field_count_of_type (type_id)
		do
			create Result.make_from_c ({ISE_RUNTIME}.field_name_of_type (i, type_id))
		ensure
			instance_free: class
		end

	field_static_type_of_type (i: INTEGER_32; type_id: INTEGER_32): INTEGER_32
			-- Static type of declared i-th field of dynamic type type_id
		require
			type_id_nonnegative: type_id >= 0
			index_large_enough: i >= 1
			index_small_enough: i <= field_count_of_type (type_id)
		do
			Result := {ISE_RUNTIME}.field_static_type_of_type (i, type_id)
		ensure
			instance_free: class
			field_type_nonnegative: Result >= 0
		end

	field_type_of_type (i: INTEGER_32; type_id: INTEGER_32): INTEGER_32
			-- Abstract type of i-th field of dynamic type type_id
		require
			type_id_nonnegative: type_id >= 0
			index_large_enough: i >= 1
			index_small_enough: i <= field_count_of_type (type_id)
		do
			Result := {ISE_RUNTIME}.field_type_of_type (i, type_id)
		ensure
			instance_free: class
			field_type_nonnegative: Result >= 0
		end

	generating_type: TYPE [detachable REFLECTOR]
			-- 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

	generic_count_of_type (type_id: INTEGER_32): INTEGER_32
			-- Number of generic parameter in type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.generic_parameter_count (type_id)
		ensure
			instance_free: class
		end

	generic_dynamic_type_of_type (type_id: INTEGER_32; i: INTEGER_32): INTEGER_32
			-- Dynamic type of generic parameter of type_id at position i.
		require
			type_id_nonnegative: type_id >= 0
			type_id_generic: generic_count_of_type (type_id) > 0
			i_valid: i > 0 and i <= generic_count_of_type (type_id)
		do
			Result := {ISE_RUNTIME}.eif_gen_param_id (type_id, i)
		ensure
			instance_free: class
			dynamic_type_nonnegative: Result >= 0
		end

	Integer_16_type: INTEGER_32 = 10
			-- Abstract type ID for predefined type INTEGER_16.
			-- (from REFLECTOR_CONSTANTS)

	Integer_32_type: INTEGER_32 = 4
			-- Abstract type ID for predefined type INTEGER_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Integer_type.
			-- (from REFLECTOR_CONSTANTS)

	Integer_64_type: INTEGER_32 = 11
			-- Abstract type ID for predefined type INTEGER_64.
			-- (from REFLECTOR_CONSTANTS)

	Integer_8_type: INTEGER_32 = 9
			-- Abstract type ID for predefined type INTEGER_8.
			-- (from REFLECTOR_CONSTANTS)

	Integer_type: INTEGER_32 = 4
			-- Abstract type ID for predefined type INTEGER_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Integer_32_type.
			-- (from REFLECTOR_CONSTANTS)

	Max_predefined_type: INTEGER_32 = 16
			-- (from REFLECTOR_CONSTANTS)

	Min_predefined_type: INTEGER_32 = -2
			-- (from REFLECTOR_CONSTANTS)

	Natural_16_type: INTEGER_32 = 14
			-- Abstract type ID for predefined type NATURAL_16.
			-- (from REFLECTOR_CONSTANTS)

	Natural_32_type: INTEGER_32 = 15
			-- Abstract type ID for predefined type NATURAL_32.
			-- (from REFLECTOR_CONSTANTS)

	Natural_64_type: INTEGER_32 = 16
			-- Abstract type ID for predefined type NATURAL_64.
			-- (from REFLECTOR_CONSTANTS)

	Natural_8_type: INTEGER_32 = 13
			-- Abstract type ID for predefined type NATURAL_8.
			-- (from REFLECTOR_CONSTANTS)

	None_type: INTEGER_32 = -2
			-- Type ID representation for NONE.
			-- (from REFLECTOR_CONSTANTS)

	Pointer_type: INTEGER_32 = 0
			-- Abstract type ID for predefined type POINTER.
			-- (from REFLECTOR_CONSTANTS)

	Real_32_type: INTEGER_32 = 5
			-- Abstract type ID for predefined type REAL_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Real_type.
			-- (from REFLECTOR_CONSTANTS)

	Real_64_type: INTEGER_32 = 6
			-- Abstract type ID for predefined type REAL_64.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Double_type.
			-- (from REFLECTOR_CONSTANTS)

	Real_type: INTEGER_32 = 5
			-- Abstract type ID for predefined type REAL_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Real_32_type.
			-- (from REFLECTOR_CONSTANTS)

	Reference_type: INTEGER_32 = 1
			-- Abstract type ID for a reference type.
			-- (from REFLECTOR_CONSTANTS)

	storable_version_of_type (a_type_id: INTEGER_32): detachable IMMUTABLE_STRING_8
			-- Storable version if any specified.
		require
			a_type_id_nonnegative: a_type_id >= 0
		local
			l_result: detachable STRING_8
		do
			Id_to_storable_version.search (a_type_id)
			if Id_to_storable_version.found then
				Result := Id_to_storable_version.found_item
			else
				l_result := {ISE_RUNTIME}.storable_version_of_type (a_type_id)
				if l_result /= Void then
					create Result.make_from_string (l_result)
				end;
				Id_to_storable_version.put (Result, a_type_id)
			end
		ensure
			instance_free: class
		end

	type_name_8_of_type (type_id: INTEGER_32): STRING_8
			-- Name of type_id's generating type (type of which type_id
			-- is a direct instance).
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.generating_type_8_of_type (type_id)
		ensure
			instance_free: class
		end

	type_name_of_type (type_id: INTEGER_32): STRING_8
			-- Name of type_id's generating type (type of which type_id
			-- is a direct instance).
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.generating_type_of_type (type_id)
		ensure
			instance_free: class
		end

	Wide_character_type: INTEGER_32 = 12
			-- Abstract type ID for predefined type CHARACTER_32.
			-- Was declared in REFLECTOR_CONSTANTS as synonym of Character_32_type.
			-- (from REFLECTOR_CONSTANTS)
	
feature -- Measurement

	field_count_of_type (type_id: INTEGER_32): INTEGER_32
			-- Number of logical fields in dynamic type type_id.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.field_count_of_type (type_id)
		ensure
			instance_free: class
		end

	persistent_field_count_of_type (a_type_id: INTEGER_32): INTEGER_32
			-- Number of logical fields in dynamic type type_id that are not transient.
		require
			a_type_non_negative: a_type_id >= 0
		do
			Result := {ISE_RUNTIME}.persistent_field_count_of_type (a_type_id)
		ensure
			instance_free: class
		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: REFLECTOR): 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: REFLECTOR): 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 alias "≜" (other: REFLECTOR): 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

	is_attached_type (a_type_id: INTEGER_32): BOOLEAN
			-- Is a_type_id an attached type?
		require
			a_type_non_negative: a_type_id >= 0
		do
			Result := {ISE_RUNTIME}.is_attached_type (a_type_id)
		ensure
			instance_free: class
		end

	is_field_expanded_of_type (i: INTEGER_32; a_type_id: INTEGER_32): BOOLEAN
			-- Is i-th field of type a_type_id a user-defined expanded attribute?
		require
			a_type_non_negative: a_type_id >= 0
			index_large_enough: i >= 1
			index_small_enough: i <= field_count_of_type (a_type_id)
		do
			Result := {ISE_RUNTIME}.is_field_expanded_of_type (i, a_type_id)
		ensure
			instance_free: class
		end

	is_field_transient_of_type (i: INTEGER_32; a_type_id: INTEGER_32): BOOLEAN
			-- Is i-th field of object a transient attribute?
			-- I.e. an attribute that does not need to be stored?
		require
			a_type_non_negative: a_type_id >= 0
			index_large_enough: i >= 1
			index_small_enough: i <= field_count_of_type (a_type_id)
		do
			Result := {ISE_RUNTIME}.is_field_transient_of_type (i, a_type_id)
		ensure
			instance_free: class
		end

	is_pre_ecma_mapping_disabled: BOOLEAN
			-- Are we mapping old names to new ECMA names?
			-- False means mapping STRING to STRING_8, INTEGER to INTEGER_32,...
			-- Redefine in descendants of REFLECTOR to modify the behavior of inspection queries of REFLECTOR.
			-- (from REFLECTOR_HELPER)
		do
			Result := False
		ensure -- from REFLECTOR_HELPER
			instance_free: class
		end

	is_special_any_type (type_id: INTEGER_32): BOOLEAN
			-- Is type represented by type_id represent
			-- a SPECIAL [XX] where XX is a reference type.
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.is_special_of_reference_type (type_id)
		ensure
			instance_free: class
		end

	is_special_type (type_id: INTEGER_32): BOOLEAN
			-- Is type represented by type_id represent
			-- a SPECIAL [XX] where XX is a reference type
			-- or a basic expanded type (note that user-defined
			-- expanded types are excluded).
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.is_special_of_reference_or_basic_type (type_id)
		ensure
			instance_free: class
		end

	is_tuple_type (type_id: INTEGER_32): BOOLEAN
			-- Is type represented by type_id represent a TUPLE?
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.is_tuple_type (type_id)
		ensure
			instance_free: class
		end

	is_valid_type_string (s: READABLE_STRING_GENERAL): BOOLEAN
			-- Is s a valid string representation for a TYPE.
			-- (from REFLECTOR_HELPER)
		local
			l_type_name: STRING_32
			l_start_pos, l_end_pos: INTEGER_32
			l_class_type_name: STRING_32
			l_parameters: like parameters_decomposition
		do
			if s /= Void and then not s.is_empty then
				create l_class_type_name.make_from_string_general (s);
				l_class_type_name.adjust
				l_start_pos := l_class_type_name.index_of ('['.to_character_32, 1)
				if l_start_pos > 1 then
					l_end_pos := l_class_type_name.count
					if l_class_type_name.item (l_end_pos) /= ']'.to_character_32 then
						l_end_pos := 0
					end
					if l_end_pos = l_class_type_name.count and l_start_pos < l_end_pos and l_class_type_name.occurrences ('['.to_character_32) = l_class_type_name.occurrences (']'.to_character_32) then
						l_type_name := l_class_type_name.substring (1, l_start_pos - 1);
						l_type_name.adjust
						if is_valid_identifier (l_type_name) then
							l_parameters := parameters_decomposition (l_class_type_name.substring (l_start_pos + 1, l_end_pos - 1))
							if l_parameters /= Void then
								from
									Result := True;
									l_parameters.start
								until
									l_parameters.after or not Result
								loop
									Result := is_valid_type_string (l_parameters.item);
									l_parameters.forth
								end
							end
						end
					end
				else
					Result := is_valid_identifier (l_class_type_name)
				end
			end
		ensure -- from REFLECTOR_HELPER
			instance_free: class
		end

	mapped_type (a_type: READABLE_STRING_GENERAL): READABLE_STRING_GENERAL
			-- If is_pre_ecma_mapping_disabled a_type, otherwise
			-- the mapped typed.
			-- (from REFLECTOR_HELPER)
		require -- from REFLECTOR_HELPER
			a_type_not_void: a_type /= Void
		local
			l_table: like Pre_ecma_type_mapping
		do
			if not is_pre_ecma_mapping_disabled then
				l_table := Pre_ecma_type_mapping;
				l_table.search (a_type)
				if l_table.found then
					Result := l_table.found_item
				end
			end
			if Result = Void then
				Result := a_type
			end
		ensure -- from REFLECTOR_HELPER
			instance_free: class
			mapped_type_not_void: Result /= Void
		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 -- 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: REFLECTOR)
			-- 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: REFLECTOR)
			-- 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: REFLECTOR
			-- 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: REFLECTOR)
			-- 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: REFLECTOR
			-- 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: REFLECTOR
			-- 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 REFLECTOR
		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 REFLECTOR
			-- 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

	Id_to_storable_version: HASH_TABLE [detachable IMMUTABLE_STRING_8, INTEGER_32]
			-- Buffer for storable_version_of_type lookups index by type_id.
		once
			create Result.make (100)
		ensure
			instance_free: class
			id_to_storable_version_not_void: Result /= Void
		end

	Internal_dynamic_type_string_table: STRING_TABLE [INTEGER_32]
			-- Table of dynamic type indexed by type name
		once
			create Result.make (100)
		ensure
			instance_free: class
			internal_dynamic_type_string_table_not_void: Result /= Void
		end
	
feature -- Conformance

	field_conforms_to (a_source_type, a_field_type: INTEGER_32): BOOLEAN
			-- Does a_source_type conform to a_field_type?
		require
			a_source_type_non_negative: a_source_type >= 0
			a_field_type_non_negative: a_field_type >= 0
		do
			Result := {ISE_RUNTIME}.type_conforms_to (a_source_type, {ISE_RUNTIME}.detachable_type (a_field_type))
		ensure
			instance_free: class
		end

	type_conforms_to (type1, type2: INTEGER_32): BOOLEAN
			-- Does type1 conform to type2?
		require
			type1_nonnegative: type1 >= 0
			type2_nonnegative: type2 >= 0
		do
			Result := {ISE_RUNTIME}.type_conforms_to (type1, type2)
		ensure
			instance_free: class
		end
	
feature -- Creation

	dynamic_type_from_string (class_type: READABLE_STRING_GENERAL): INTEGER_32
			-- Dynamic type corresponding to class_type.
			-- If no dynamic type available, returns -1.
		require
			class_type_not_void: class_type /= Void
			class_type_not_empty: not class_type.is_empty
			is_valid_type_string: is_valid_type_string (class_type)
		local
			l_cstr: C_STRING
			l_table: like Internal_dynamic_type_string_table
			l_pre_ecma_status: BOOLEAN
		do
			l_table := Internal_dynamic_type_string_table;
			l_table.search (class_type)
			if l_table.found then
				Result := l_table.found_item
			else
				create l_cstr.make (class_type)
				l_pre_ecma_status := {ISE_RUNTIME}.pre_ecma_mapping_status
				{ISE_RUNTIME}.set_pre_ecma_mapping (not is_pre_ecma_mapping_disabled)
				Result := {ISE_RUNTIME}.type_id_from_name (l_cstr.item)
				{ISE_RUNTIME}.set_pre_ecma_mapping (l_pre_ecma_status);
				l_table.put (Result, class_type)
			end
		ensure
			instance_free: class
			dynamic_type_from_string_valid: Result = -1 or Result = None_type or Result >= 0
		end

	new_instance_of (type_id: INTEGER_32): ANY
			-- New instance of dynamic type_id.
			-- Note: returned object is not initialized and may
			-- hence violate its invariant.
			-- type_id cannot represent a SPECIAL type, use
			-- new_special_any_instance instead.
		require
			type_id_nonnegative: type_id >= 0
			not_special_type: not is_special_type (type_id)
			not_deferred: not type_of_type (type_id).is_deferred
		do
			Result := {ISE_RUNTIME}.new_instance_of (type_id)
		ensure
			instance_free: class
			not_special_type: not attached {SPECIAL [detachable ANY]} Result
			dynamic_type_set: attached_type (Result.generating_type.type_id) = attached_type (type_id)
		end

	new_special_any_instance (type_id, a_capacity: INTEGER_32): SPECIAL [detachable ANY]
			-- New instance of dynamic type_id that represents
			-- a SPECIAL which can contain a_capacity elements of reference type.
			-- To create a SPECIAL of basic type, use class SPECIAL directly.
		require
			a_capacity_valid: a_capacity >= 0
			type_id_nonnegative: type_id >= 0
			special_type: is_special_any_type (type_id)
		do
			Result := {ISE_RUNTIME}.new_special_of_reference_instance_of (type_id, a_capacity)
		ensure
			instance_free: class
			dynamic_type_set: Result.generating_type.type_id = type_id
			count_set: Result.count = 0
			capacity_set: Result.capacity = a_capacity
		end

	new_tuple_from_special (type_id: INTEGER_32; values: SPECIAL [detachable separate ANY]): detachable TUPLE
			-- New instance of a tuple of type type_id filled with values if all types of items are suitable.
			-- Void if some items from values are inappropriate for a tuple of type type_id.
		require
			type_id_nonnegative: type_id >= 0
			is_tuple_type: is_tuple_type (type_id)
		local
			i: INTEGER_32
			v: detachable separate ANY
		do
			Result := {ISE_RUNTIME}.new_tuple_instance_of (type_id)
			i := Result.count
			if i <= values.count then
				from
				until
					i <= 0 or else not attached Result
				loop
					v := values [i - 1]
					if Result.valid_type_for_index (v, i) then
						Result [i] := v
					else
						Result := Void
					end
					i := i - 1
				end
			else
				Result := Void
			end
		ensure
			instance_free: class
			dynamic_type_set: attached Result implies Result.generating_type.type_id = type_id
			values_set: attached Result implies ∀ k: 1 |..| Result.count ¦
					Result.item (k) = values [k - 1]
		end

	new_tuple_from_tuple (type_id: INTEGER_32; source: separate TUPLE): detachable TUPLE
			-- New instance of a tuple of type type_id filled with values fom source if all value types are suitable.
			-- Void if some values from source are inappropriate for a tuple of type type_id.
		require
			type_id_nonnegative: type_id >= 0
			is_tuple_type: is_tuple_type (type_id)
		local
			i: INTEGER_32
			v: detachable separate ANY
		do
			Result := {ISE_RUNTIME}.new_tuple_instance_of (type_id)
			i := Result.count
			if i <= source.count then
				if source.object_comparison then
					Result.compare_objects
				end
				from
				until
					i <= 0 or else not attached Result
				loop
					v := source [i]
					if Result.valid_type_for_index (v, i) then
						Result [i] := v
					else
						Result := Void
					end
					i := i - 1
				end
			else
				Result := Void
			end
		ensure
			instance_free: class
			dynamic_type_set: attached Result implies Result.generating_type.type_id = type_id
			object_comparison_set: attached Result implies Result.object_comparison = source.object_comparison
			values_set: attached Result implies ∀ k: 1 |..| Result.count ¦
					Result.item (k) = source [k]
		end

	type_of_type (type_id: INTEGER_32): TYPE [detachable ANY]
			-- Associated TYPE instance for an object of type id type_id
		require
			type_id_nonnegative: type_id >= 0
		do
			Result := {ISE_RUNTIME}.new_type_instance_of (type_id)
		ensure
			instance_free: class
			result_not_void: Result /= Void
		end
	
feature {NONE} -- Decompose string type

	parameters_decomposition (a_str: READABLE_STRING_32): detachable ARRAYED_LIST [READABLE_STRING_32]
			-- Decompose a_str which should be of the form "A, B, D [G], H [E ,F]"
			-- into a list of strings "A", "B", "D [G]", "H [E, F]"
			-- If decomposition is not possible, Void.
			-- (from REFLECTOR_HELPER)
		require -- from REFLECTOR_HELPER
			a_str_not_void: a_str /= Void
		local
			i, nb: INTEGER_32
			l_invalid: BOOLEAN
			l_first_pos: INTEGER_32
			l_nesting: INTEGER_32
		do
			from
				create Result.make (5)
				i := 1
				l_first_pos := 1
				nb := a_str.count
			until
				i > nb or l_invalid
			loop
				inspect a_str.item (i)
				when ',' then
					if l_nesting = 0 then
						Result.extend (a_str.substring (l_first_pos, i - 1))
						l_first_pos := i + 1
					end
				when '[' then
					l_nesting := l_nesting + 1
				when ']' then
					l_nesting := l_nesting - 1
					l_invalid := l_nesting < 0
				else
				end
				i := i + 1
			end
			if not l_invalid and then l_nesting = 0 then
				Result.extend (a_str.substring (l_first_pos, i - 1))
			else
				Result := Void
			end
		ensure -- from REFLECTOR_HELPER
			instance_free: class
		end
	
feature {NONE} -- ECMA mapping helper

	Attached_keyword: STRING_8 = "attached"
			-- (from REFLECTOR_HELPER)

	Attached_mark: CHARACTER_32 = '!'
			-- (from REFLECTOR_HELPER)

	Detachable_keyword: STRING_8 = "detachable"
			-- (from REFLECTOR_HELPER)

	Detachable_mark: CHARACTER_32 = '?'
			-- (from REFLECTOR_HELPER)

	Expanded_keyword: STRING_8 = "expanded"
			-- Symbols use for attachment marks.
			-- (from REFLECTOR_HELPER)

	Pre_ecma_type_mapping: STRING_TABLE [STRING_8]
			-- Mapping between pre-ECMA type naming and new names.
			-- (from REFLECTOR_HELPER)
		once
			create Result.make (12);
			Result.put ("STRING_8", "STRING");
			Result.put ("INTEGER_32", "INTEGER");
			Result.put ("INTEGER_32_REF", "INTEGER_REF");
			Result.put ("CHARACTER_8", "CHARACTER");
			Result.put ("CHARACTER_8_REF", "CHARACTER_REF");
			Result.put ("CHARACTER_32", "WIDE_CHARACTER");
			Result.put ("CHARACTER_32_REF", "WIDE_CHARACTER_REF");
			Result.put ("REAL_32", "REAL");
			Result.put ("REAL_32_REF", "REAL_REF");
			Result.put ("REAL_64", "DOUBLE");
			Result.put ("REAL_64_REF", "DOUBLE_REF")
		ensure -- from REFLECTOR_HELPER
			instance_free: class
			pre_ecma_type_mapping_not_void: Result /= Void
		end
	
feature {NONE} -- Implementation: status report

	is_valid_identifier (s: READABLE_STRING_GENERAL): BOOLEAN
			-- Is s a valid Eiffel identifier?
			-- (from REFLECTOR_HELPER)
		require -- from REFLECTOR_HELPER
			name_not_void: s /= Void
		local
			i, nb: INTEGER_32
			cc: CHARACTER_32
		do
			if not s.is_empty then
				cc := s.item (1)
				nb := s.count + 1
				if cc = Attached_mark or cc = Detachable_mark then
					i := 2
				elseif s.substring_index (Attached_keyword, 1) = 1 then
					i := Attached_keyword.count + 1
				elseif s.substring_index (Detachable_keyword, 1) = 1 then
					i := Detachable_keyword.count + 1
				elseif s.substring_index (Expanded_keyword, 1) = 1 then
					i := Expanded_keyword.count + 1
				else
					i := 1
				end
				if i > 1 then
					from
					until
						i = nb or not s.item (i).is_space
					loop
						i := i + 1
					end
				end
				if s.item (i).is_alpha then
					from
						Result := True
					until
						i = nb
					loop
						cc := s.item (i)
						if not (cc.is_alpha or cc.is_digit or cc = '_'.to_character_32) then
							Result := False
							i := nb - 1
						end
						i := i + 1
					end
				end
			end
		ensure -- from REFLECTOR_HELPER
			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)
		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
	
feature {NONE} -- Type creation

	Type_keyword: STRING_8 = "TYPE"
			-- Used for creating type objects.
			-- (from REFLECTOR_HELPER)
	
feature -- Version

	compiler_version: INTEGER_32
		do
			Result := 0
		ensure
			instance_free: class
		end
	
invariant
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

note
	copyright: "Copyright (c) 1984-2020, 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 REFLECTOR

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