note
	description: "Convertor to do hexadecimal string to integer/natural conversion"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2017-03-23 20:46:07 +0000 (Thu, 23 Mar 2017) $"
	revision: "$Revision: 100037 $"

frozen class 
	HEXADECIMAL_STRING_TO_INTEGER_CONVERTER

create 
	make

feature {NONE} -- Initialization

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

	make
			-- Initialize.
		do
			reset (Type_no_limitation)
			create leading_separators.make_from_string (" ")
			create trailing_separators.make_from_string (" ")
		ensure
			leading_separators_set: leading_separators ~ " "
			trailing_separators_set: trailing_separators ~ " "
			leading_separators_not_acceptable: not leading_separators_acceptable
			trailing_separatorsnot_acceptable: not trailing_separators_acceptable
		end
	
feature -- Access

	generating_type: TYPE [detachable HEXADECIMAL_STRING_TO_INTEGER_CONVERTER]
			-- 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
	
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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER): 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER): 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER): 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

	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 -- Status setting

	set_leading_separators (separators: STRING_8)
			-- Set leading_separators with separators.
			-- (from STRING_TO_NUMERIC_CONVERTOR)
		require -- from STRING_TO_NUMERIC_CONVERTOR
			separators_not_void: separators /= Void
			separators_valid: separators_valid (separators)
		do
			create leading_separators.make_from_string (separators)
		ensure -- from STRING_TO_NUMERIC_CONVERTOR
			leading_separators_set: leading_separators ~ separators
		end

	set_leading_separators_acceptable (b: BOOLEAN)
			-- Set leading_separators_acceptable to b.
			-- (from STRING_TO_NUMERIC_CONVERTOR)
		do
			leading_separators_acceptable := b
		ensure -- from STRING_TO_NUMERIC_CONVERTOR
			leading_separators_acceptable_set: leading_separators_acceptable = b
		end

	set_trailing_separators (separators: STRING_8)
			-- Set trailing_separators with separators.
			-- (from STRING_TO_NUMERIC_CONVERTOR)
		require -- from STRING_TO_NUMERIC_CONVERTOR
			separators_not_void: separators /= Void
			separators_valid: separators_valid (separators)
		do
			create trailing_separators.make_from_string (separators)
		ensure -- from STRING_TO_NUMERIC_CONVERTOR
			trailing_separators_set: trailing_separators ~ separators
		end

	set_trailing_separators_acceptable (b: BOOLEAN)
			-- Set trailing_separators_acceptable to b.
			-- (from STRING_TO_NUMERIC_CONVERTOR)
		do
			trailing_separators_acceptable := b
		ensure -- from STRING_TO_NUMERIC_CONVERTOR
			trailing_separators_acceptable_set: trailing_separators_acceptable = b
		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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER)
			-- 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER)
			-- 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER
			-- 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER)
			-- 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER
			-- 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: HEXADECIMAL_STRING_TO_INTEGER_CONVERTER
			-- 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 HEXADECIMAL_STRING_TO_INTEGER_CONVERTER
		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 HEXADECIMAL_STRING_TO_INTEGER_CONVERTER
			-- 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

	last_state: INTEGER_32
			-- Last state of this state machine
			-- (from STRING_TO_NUMERIC_CONVERTOR)

	sign: INTEGER_32
			-- Sign of this integer, 0: positive; 1: negative.
			-- (from STRING_TO_NUMERIC_CONVERTOR)
	
feature {NONE} -- Attributes

	internal_lookahead: CHARACTER_8
			-- Lookahead to decide to which state to jump on certain charaters.

	internal_overflowed: BOOLEAN
			-- Internal overflow bit.

	Overflow_checker: INTEGER_OVERFLOW_CHECKER
			-- Overflow checker.
		once
			create Result.make
		ensure
			overflow_checker_not_void: Result /= Void
		end

	part1: like max_natural_type
			-- Naturals used for conversion.

	part2: like max_natural_type
			-- Naturals used for conversion.
	
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 -- Parse

	parse_character (c: CHARACTER_8)
			-- Parse c in current parse session.
			-- Make result available in overflowed, underflowed and parse_successful.			
		local
			temp_p1: like max_natural_type
			temp_p2: like max_natural_type
			l_state: like last_state
		do
			l_state := last_state
			if l_state <= 5 then
				inspect l_state
				when 0 then
					if (c = '0' and (internal_lookahead = 'x' or internal_lookahead = 'X')) or c = '&' then
						l_state := 1
					elseif c = '-' or c = '+' then
						l_state := 1
						if c = '-' then
							sign := 1
						else
							sign := 0
						end
					elseif c.is_hexa_digit then
						l_state := 3
						part1 := 0
						if c >= '0' and c <= '9' then
							part2 := (c.code - 48).to_natural_64
						elseif c >= 'a' and c <= 'f' then
							part2 := (c.code - 87).to_natural_64
						elseif c >= 'A' and c <= 'F' then
							part2 := (c.code - 55).to_natural_64
						end
					elseif leading_separators_acceptable and then leading_separators.has (c) then
					else
						l_state := 4
					end
				when 1 then
					if c.is_hexa_digit then
						part1 := 0
						if c >= '0' and c <= '9' then
							part2 := (c.code - 48).to_natural_64
						elseif c >= 'a' and c <= 'f' then
							part2 := (c.code - 87).to_natural_64
						elseif c >= 'A' and c <= 'F' then
							part2 := (c.code - 55).to_natural_64
						end
						l_state := 3
						if conversion_type /= Type_no_limitation and then Overflow_checker.will_overflow (part1, part2, conversion_type, sign) then
							internal_overflowed := True
							part2 := 0
							l_state := 6
						end
					elseif c = '#' then
						l_state := 1
					elseif c = 'x' or c = 'X' then
						l_state := 2
					end
				when 2 then
					if c.is_hexa_digit then
						part1 := 0
						if c >= '0' and c <= '9' then
							part2 := (c.code - 48).to_natural_64
						elseif c >= 'a' and c <= 'f' then
							part2 := (c.code - 87).to_natural_64
						elseif c >= 'A' and c <= 'F' then
							part2 := (c.code - 55).to_natural_64
						end
						l_state := 3
						if conversion_type /= Type_no_limitation and then Overflow_checker.will_overflow (part1, part2, conversion_type, sign) then
							internal_overflowed := True
							part2 := 0
							l_state := 6
						end
					end
				when 3 then
					if c.is_hexa_digit then
						temp_p1 := part1
						temp_p2 := part2
						part1 := part1 * 16 + part2
						if c >= '0' and c <= '9' then
							part2 := (c.code - 48).to_natural_64
						elseif c >= 'a' and c <= 'f' then
							part2 := (c.code - 87).to_natural_64
						elseif c >= 'A' and c <= 'F' then
							part2 := (c.code - 55).to_natural_64
						end
						if conversion_type /= Type_no_limitation then
							internal_overflowed := Overflow_checker.will_overflow (part1, part2, conversion_type, sign)
							if overflowed then
								part1 := temp_p1
								part2 := temp_p2
								l_state := 6
							end
						end
					elseif trailing_separators_acceptable and then trailing_separators.has (c) then
						l_state := 4
					else
						l_state := 5
					end
				when 4 then
					if not trailing_separators_acceptable or else not trailing_separators.has (c) then
						l_state := 5
					end
				end
			end
			last_state := l_state
		end

	parse_string_with_type (s: READABLE_STRING_GENERAL; type: INTEGER_32)
			-- reset convertor to start a new parse session and
			-- parse s to see if it is a number of type.
			-- Make result available in overflowed, underflowed and parse_successful.
			-- See NUMERIC_INFORMATION for more information about type.
			-- (Case insensitive) Hexadecimal prefixes can be '0x' or '&#x'.
		require -- from STRING_TO_NUMERIC_CONVERTOR
			s_not_void: s /= Void
			type_valid: conversion_type_valid (type)
		local
			i: INTEGER_32
			l_area8: SPECIAL [CHARACTER_8]
			l_area32: SPECIAL [CHARACTER_32]
			nb: INTEGER_32
			l_code: NATURAL_32
			l_c: CHARACTER_32
		do
			reset (type)
			i := 0
			nb := s.count
			if attached {READABLE_STRING_8} s as l_str8 then
				from
					l_area8 := l_str8.area
				until
					i = nb or last_state >= 4
				loop
					if i + 1 < nb then
						internal_lookahead := l_area8.item (i + 1)
					else
						internal_lookahead := ' '
					end
					parse_character (l_area8.item (i))
					i := i + 1
				end
			elseif attached {READABLE_STRING_32} s as l_str32 then
				from
					l_area32 := l_str32.area
				until
					i = nb or last_state >= 4
				loop
					if i + 1 < nb then
						internal_lookahead := l_area32.item (i + 1).to_character_8
					else
						internal_lookahead := ' '
					end
					l_c := l_area32.item (i)
					if l_c.is_character_8 then
						parse_character (l_c.to_character_8)
					else
						last_state := 4
					end
					i := i + 1
				end
			else
				from
					i := 1
					nb := s.count
				until
					i > nb or last_state >= 4
				loop
					if i + 1 < nb then
						internal_lookahead := s.code (i + 1).to_character_8
					else
						internal_lookahead := ' '
					end
					l_code := s.code (i)
					if l_code.is_valid_character_8_code then
						parse_character (l_code.to_character_8)
					else
						last_state := 4
					end
					i := i + 1
				end
			end
		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 -- Reset

	reset (type: INTEGER_32)
			-- Reset this convertor to start a new parse session
			-- and get ready for parsing integer of type.
			-- Always call this feature before every new parse session.
			-- See NUMERIC_INFORMATION for more information about type.
		require -- from STRING_TO_NUMERIC_CONVERTOR
			type_valid: conversion_type_valid (type)
		do
			last_state := 0
			sign := 0
			conversion_type := type
			internal_overflowed := False
		ensure -- from STRING_TO_NUMERIC_CONVERTOR
			last_state_set: last_state = 0
			sign_set: sign = 0
			conversion_type_set: conversion_type = type
			not_overflowed: not overflowed
			not_underflowed: not underflowed
			parse_successful: parse_successful
		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 -- Status Report

	conversion_type_valid (type: INTEGER_32): BOOLEAN
			-- If conversion type valid?
		do
			Result := integer_natural_type_valid (type)
		end

	is_integral_integer: BOOLEAN
			-- Is character sequence that has been parsed so far a valid integral integer?
		do
			Result := (last_state = 2 or last_state = 3) and not internal_overflowed
		end

	is_part_of_integer: BOOLEAN
			-- Is character sequence that has been parsed so far a valid start part of an integer?
		do
			Result := (last_state = 0 or last_state = 1 or last_state = 2 or last_state = 3) and not internal_overflowed
		end

	parsed_integer: INTEGER_32
			-- INTEGER representation of parsed string.
			-- Was declared in HEXADECIMAL_STRING_TO_INTEGER_CONVERTER as synonym of parsed_integer_32.
		do
			if sign = 1 then
				Result := - (part1 * 16 + part2).as_integer_32
			else
				Result := (part1 * 16 + part2).as_integer_32
			end
		end

	parsed_integer_16: INTEGER_16
			-- INTEGER_16 representation of parsed string.
		do
			if sign = 1 then
				Result := - (part1 * 16 + part2).as_integer_16
			else
				Result := (part1 * 16 + part2).as_integer_16
			end
		end

	parsed_integer_32: INTEGER_32
			-- INTEGER representation of parsed string.
			-- Was declared in HEXADECIMAL_STRING_TO_INTEGER_CONVERTER as synonym of parsed_integer.
		do
			if sign = 1 then
				Result := - (part1 * 16 + part2).as_integer_32
			else
				Result := (part1 * 16 + part2).as_integer_32
			end
		end

	parsed_integer_64: INTEGER_64
			-- INTEGER_64 representation of parsed string.
		do
			if sign = 1 then
				Result := - (part1 * 16 + part2).as_integer_64
			else
				Result := (part1 * 16 + part2).as_integer_64
			end
		end

	parsed_integer_8: INTEGER_8
			-- INTEGER_8 representation of parsed string.
		do
			if sign = 1 then
				Result := - (part1 * 16 + part2).as_integer_8
			else
				Result := (part1 * 16 + part2).as_integer_8
			end
		end

	parsed_natural: NATURAL_32
			-- NATURAL_32 representation of parsed string.
			-- Was declared in HEXADECIMAL_STRING_TO_INTEGER_CONVERTER as synonym of parsed_natural_32.
		do
			Result := (part1 * 16 + part2).as_natural_32
		end

	parsed_natural_16: NATURAL_16
			-- NATURAL_16 representation of parsed string.
		do
			Result := (part1 * 16 + part2).as_natural_16
		end

	parsed_natural_32: NATURAL_32
			-- NATURAL_32 representation of parsed string.
			-- Was declared in HEXADECIMAL_STRING_TO_INTEGER_CONVERTER as synonym of parsed_natural.
		do
			Result := (part1 * 16 + part2).as_natural_32
		end

	parsed_natural_64: NATURAL_64
			-- NATURAL_64 representation of parsed string.
		do
			Result := part1 * 16 + part2
		end

	parsed_natural_8: NATURAL_8
			-- NATURAL_8 representation of parsed string.
		do
			Result := (part1 * 16 + part2).as_natural_8
		end
	
feature -- Status Reporting

	overflowed: BOOLEAN
			-- Is integer parsed so far overflowed?
		do
			Result := internal_overflowed and then sign = 0
		end

	parse_successful: BOOLEAN
			-- This only means we didn't enter an invalid state when parsing,
			-- it doesn't mean that we have got an valid integer.
			-- You need to check is_integral_integer or is_part_of_integer.
		do
			Result := last_state /= 5 and last_state /= 6
		end

	separators_valid (separators: STRING_8): BOOLEAN
			-- Are separators valid?
		require -- from STRING_TO_NUMERIC_CONVERTOR
			separators_not_void: separators /= Void
		local
			c: CHARACTER_8
			done: BOOLEAN
			i: INTEGER_32
			l_c: INTEGER_32
		do
			from
				i := 1
				l_c := separators.count
				done := False
				Result := True
			until
				i > l_c or done
			loop
				c := separators.item (i)
				if (c >= '0' and c <= '9') or c = '+' or c = '-' or c = 'X' or c = '&' or c = '#' then
					done := True
					Result := False
				end
				i := i + 1
			end
		end

	underflowed: BOOLEAN
			-- Is integer parsed so far underflowed?
		do
			Result := internal_overflowed and then sign = 1
		end
	
feature -- Status reporting

	conversion_type: INTEGER_32
			-- Type to which a string will be converted
			-- See NUMERIC_INFORMATION for more information.
			-- (from STRING_TO_NUMERIC_CONVERTOR)

	leading_separators: STRING_8
			-- Leading separators
			-- (from STRING_TO_NUMERIC_CONVERTOR)

	leading_separators_acceptable: BOOLEAN
			-- Are leading separators acceptable?
			-- (from STRING_TO_NUMERIC_CONVERTOR)

	trailing_separators: STRING_8
			-- Trailing separators
			-- (from STRING_TO_NUMERIC_CONVERTOR)

	trailing_separators_acceptable: BOOLEAN
			-- Are trailing separators acceptable?
			-- (from STRING_TO_NUMERIC_CONVERTOR)
	
feature -- Type checking

	double_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid double type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := type = Type_double
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	integer_natural_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid integer/natural type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_no_limitation) or (type = Type_integer_8) or (type = Type_integer_16) or (type = Type_integer_32) or (type = Type_integer_64) or (type = Type_natural_8) or (type = Type_natural_16) or (type = Type_natural_32) or (type = Type_natural_64)
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	integer_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid integer type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_integer_8) or (type = Type_integer_16) or (type = Type_integer_32) or (type = Type_integer_64)
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	natural_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid natural type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_natural_8) or (type = Type_natural_16) or (type = Type_natural_32) or (type = Type_natural_64)
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	real_double_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid real/double type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := type = Type_no_limitation or type = Type_real or type = Type_double
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	real_type_valid (type: INTEGER_32): BOOLEAN
			-- Is type a valid real type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := type = Type_real
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end
	
feature -- Types

	max_integer_type: INTEGER_64
			-- INTEGER type of max word length
			-- (from NUMERIC_INFORMATION)
		do
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	max_natural_type: NATURAL_64
			-- NATURAL type of max word length
			-- (from NUMERIC_INFORMATION)
		do
		ensure -- from NUMERIC_INFORMATION
			instance_free: class
		end

	Type_count: INTEGER_32 = 4
			-- Number of types of integer/natural in Eiffel
			-- (from NUMERIC_INFORMATION)

	Type_double: INTEGER_32 = 101
			-- Real/Double type indicators
			-- (from NUMERIC_INFORMATION)

	Type_integer: INTEGER_32 = 3
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_integer_32.
			-- (from NUMERIC_INFORMATION)

	Type_integer_16: INTEGER_32 = 2
			-- (from NUMERIC_INFORMATION)

	Type_integer_32: INTEGER_32 = 3
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_integer.
			-- (from NUMERIC_INFORMATION)

	Type_integer_64: INTEGER_32 = 4
			-- (from NUMERIC_INFORMATION)

	Type_integer_8: INTEGER_32 = 1
			-- (from NUMERIC_INFORMATION)

	Type_integer_natural_separator: INTEGER_32 = 10
			-- (from NUMERIC_INFORMATION)

	Type_natural: INTEGER_32 = 13
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_natural_32.
			-- (from NUMERIC_INFORMATION)

	Type_natural_16: INTEGER_32 = 12
			-- (from NUMERIC_INFORMATION)

	Type_natural_32: INTEGER_32 = 13
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_natural.
			-- (from NUMERIC_INFORMATION)

	Type_natural_64: INTEGER_32 = 14
			-- Integer/natural type indicators
			-- (from NUMERIC_INFORMATION)

	Type_natural_8: INTEGER_32 = 11
			-- (from NUMERIC_INFORMATION)

	Type_no_limitation: INTEGER_32 = 0
			-- Type representing a number sequence (no length limitation)
			-- (from NUMERIC_INFORMATION)

	Type_real: INTEGER_32 = 100
			-- (from NUMERIC_INFORMATION)
	
invariant
		-- from STRING_TO_NUMERIC_CONVERTOR
	leading_separators_not_void: leading_separators /= Void
	trailing_separators_not_void: trailing_separators /= Void

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

note
	copyright: "Copyright (c) 1984-2017, 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 HEXADECIMAL_STRING_TO_INTEGER_CONVERTER

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