note
	description: "Formatter for non-integral numbers"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	names: format_double
	date: "$Date: 2016-12-05 17:39:47 +0000 (Mon, 05 Dec 2016) $"
	revision: "$Revision: 99631 $"

class 
	FORMAT_DOUBLE

create 
	make

feature -- Initialization

	make (w, d: INTEGER_32)
		require
			reasonable_field: w >= 1
			reasonable_decimals: d <= w
		do
			set_defaults (w)
			decimals := d
			decimal := '.'
			trailing_zeros_shown := True
		ensure
			blank_fill: fill_character = ' '
			show_sign_negative: show_sign_negative
			no_separator: no_separator
			width_set: width = w
			right_justified: right_justified
			leading_sign: leading_sign
			decimals_set: decimals = d
			decimal_point: decimal = '.'
			trailing_zeros_shown: trailing_zeros_shown
		end

	set_defaults (w: INTEGER_32)
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			reasonable_field: w >= 1
		do
			blank_fill
			width := w
			sign_normal
			sign_negative_only
			right_justify
		ensure -- from FORMAT_INTEGER
			blank_fill: fill_character = ' '
			show_sign_negative: show_sign_negative
			no_separator: no_separator
			width_set: width = w
			right_justified: right_justified
			leading_sign: leading_sign
		end
	
feature {NONE} -- Initialization

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

	after_decimal_separate: BOOLEAN
			-- Use separators after the decimal?

	arc_cosine (v: REAL_64): REAL_64
			-- Trigonometric arccosine of radian v
			-- in the range [0, pi].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"acos"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	arc_sine (v: REAL_64): REAL_64
			-- Trigonometric arcsine of radian v
			-- in the range [-pi/2, +pi/2].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"asin"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	arc_tangent (v: REAL_64): REAL_64
			-- Trigonometric arctangent of radian v
			-- in the range [-pi/2, +pi/2].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"atan"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	bracketted_negative: BOOLEAN
			-- Enclose negative numbers in brackets?
			-- (from FORMAT_INTEGER)

	ceiling (v: REAL_64): REAL_64
			-- Least integral greater than or equal to v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"ceil"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	cosine (v: REAL_64): REAL_64
			-- Trigonometric cosine of radian v approximated
			-- in the range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"cos"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	dabs (v: REAL_64): REAL_64
			-- Absolute of v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"fabs"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	decimal: CHARACTER_8
			-- What is used for the decimal

	decimals: INTEGER_32
			-- Number of digits after the decimal point.

	Euler: REAL_64 = 2.7182818284590452353602874713526625
			-- Logarithm base
			-- (from MATH_CONST)

	exp (x: REAL_64): REAL_64
			-- Exponential of v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	fill_character: CHARACTER_8
			-- Padding character.
			-- (from FORMAT_INTEGER)

	floor (v: REAL_64): REAL_64
			-- Greatest integral less than or equal to v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	generating_type: TYPE [detachable FORMAT_DOUBLE]
			-- 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

	justification: INTEGER_32
			-- Where in the field the format goes.
			-- (from FORMAT_INTEGER)

	log (v: REAL_64): REAL_64
			-- Natural logarithm of v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	log10 (v: REAL_64): REAL_64
			-- Base 10 logarithm of v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	log_2 (v: REAL_64): REAL_64
			-- Base 2 logarithm of v.
			-- (from DOUBLE_MATH)
		do
			Result := log (v) / log ({REAL_64} 2.0)
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	Pi: REAL_64 = 3.1415926535897932384626433832795029
			-- (from MATH_CONST)

	Pi_2: REAL_64 = 1.5707963267948966192313216916397514
			-- (from MATH_CONST)

	Pi_4: REAL_64 = 0.7853981633974483096156608458198757
			-- (from MATH_CONST)

	separator: CHARACTER_8
			-- Separator between 1000's of numbers.
			-- (from FORMAT_INTEGER)

	sign_format: INTEGER_32
			-- How the sign is formatted.
			-- (from FORMAT_INTEGER)

	sign_string: STRING_8
			-- Formatting details for the sign.
			-- (from FORMAT_INTEGER)

	sine (v: REAL_64): REAL_64
			-- Trigonometric sine of radian v approximated
			-- in range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"sin"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	sqrt (v: REAL_64): REAL_64
			-- Square root of v.
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	Sqrt2: REAL_64 = 1.4142135623730950488016887242096981
			-- Square root of 2
			-- (from MATH_CONST)

	tangent (v: REAL_64): REAL_64
			-- Trigonometric tangent of radian v approximated
			-- in range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		external
			"C signature (double): double use <math.h>"
		alias
			"tan"
		ensure -- from DOUBLE_MATH
			instance_free: class
		end

	trailing_sign: BOOLEAN
			-- Is the sign at the end?
			-- (from FORMAT_INTEGER)

	trailing_zeros_shown: BOOLEAN
			-- Show 0.5000 as 0.5 or 0.5000?

	width: INTEGER_32
			-- Width of the field.
			-- (from FORMAT_INTEGER)

	zero_not_shown: BOOLEAN
			-- Show 0.5 as .5 or 0.5?
	
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: FORMAT_DOUBLE): 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: FORMAT_DOUBLE): 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: FORMAT_DOUBLE): 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

	centered: BOOLEAN
			-- Are numbers to be formatted centered?
			-- (from FORMAT_INTEGER)
		do
			Result := justification = Center_justification
		ensure -- from FORMAT_INTEGER
				Result = (justification = Center_justification)
		end

	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

	ignore_sign: BOOLEAN
			-- Ignore the sign of a number?
			-- (from FORMAT_INTEGER)
		do
			Result := sign_format = Ignore_sign_value
		ensure -- from FORMAT_INTEGER
				Result = (sign_format = Ignore_sign_value)
		end

	leading_sign: BOOLEAN
			-- Is the sign leading?
			-- (from FORMAT_INTEGER)
		do
			Result := not trailing_sign
		ensure -- from FORMAT_INTEGER
				Result = not trailing_sign
		end

	left_justified: BOOLEAN
			-- Are numbers to be formatted with spaces on the right?
			-- (from FORMAT_INTEGER)
		do
			Result := justification = Left_justification
		ensure -- from FORMAT_INTEGER
				Result = (justification = Left_justification)
		end

	no_separator: BOOLEAN
			-- Is there a separator?
			-- (from FORMAT_INTEGER)
		do
			Result := separator = '%U'
		ensure -- from FORMAT_INTEGER
				Result = (separator = '%U')
		end

	not_justified: BOOLEAN
			-- Are numbers to be formatted in smallest string possible
			-- (from FORMAT_INTEGER)
		do
			Result := justification = No_justification
		ensure -- from FORMAT_INTEGER
				Result = (justification = No_justification)
		end

	right_justified: BOOLEAN
			-- Are numbers to be formatted with spaces on the left?
			-- (from FORMAT_INTEGER)
		do
			Result := justification = Right_justification
		ensure -- from FORMAT_INTEGER
				Result = (justification = Right_justification)
		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

	show_sign: BOOLEAN
			-- Are numbers to show sign whether positive or negative?
			-- (from FORMAT_INTEGER)
		do
			Result := sign_format = Show_sign_value
		ensure -- from FORMAT_INTEGER
				Result = (sign_format = Show_sign_value)
		end

	show_sign_negative: BOOLEAN
			-- Are numbers to show sign only when negative?
			-- (from FORMAT_INTEGER)
		do
			Result := sign_format = Sign_negative_value
		ensure -- from FORMAT_INTEGER
				Result = (sign_format = Sign_negative_value)
		end

	show_sign_positive: BOOLEAN
			-- Are numbers to show sign only when positive?
			-- (from FORMAT_INTEGER)
		do
			Result := sign_format = Sign_positive_value
		ensure -- from FORMAT_INTEGER
				Result = (sign_format = Sign_positive_value)
		end
	
feature -- Status setting

	asterisk_fill
			-- Fill numbers with asterisks.
			-- (from FORMAT_INTEGER)
		do
			fill_character := '*'
		ensure -- from FORMAT_INTEGER
				fill_character = '*'
		end

	blank_fill
			-- Fill numbers with blanks.
			-- (from FORMAT_INTEGER)
		do
			fill_character := ' '
		ensure -- from FORMAT_INTEGER
				fill_character = ' '
		end

	bracket_negative
			-- Bracket negative numbers.
			-- (from FORMAT_INTEGER)
		do
			bracketted_negative := True
		ensure -- from FORMAT_INTEGER
				bracketted_negative
		end

	center_justify
			-- Put padding on right and left
			-- (from FORMAT_INTEGER)
		do
			justification := Center_justification
		ensure -- from FORMAT_INTEGER
				centered
		end

	comma_decimal
			-- Use , as the decimal point.
		do
			decimal := ','
		ensure
				decimal = ','
		end

	comma_separate
			-- Set the separator to be comma.
		require -- from  FORMAT_INTEGER
			True
		do
			separator := ','
			separate_after_decimal
		ensure -- from FORMAT_INTEGER
				separator = ','
		ensure then
				after_decimal_separate
		end

	dollar_fill
			-- Fill numbers with dollars.
			-- (from FORMAT_INTEGER)
		do
			fill_character := '$'
		ensure -- from FORMAT_INTEGER
				fill_character = '$'
		end

	dot_separate
			-- Set separator to period.
			-- (from FORMAT_INTEGER)
		do
			separator := '.'
		ensure -- from FORMAT_INTEGER
				separator = '.'
		end

	hide_trailing_zeros
			-- Show 0.5000 as 0.5, and 0.0000 as 0.0.
		do
			trailing_zeros_shown := False
		ensure
			trailing_zeros_shown_set: not trailing_zeros_shown
		end

	hide_zero
			-- Show 0.5 as .5 .
		do
			zero_not_shown := True
		ensure
				zero_not_shown
		end

	left_justify
			--Put padding on right
			-- (from FORMAT_INTEGER)
		do
			justification := Left_justification
		ensure -- from FORMAT_INTEGER
				left_justified
		end

	no_justify
			-- Always return the smallest string possible
			-- (from FORMAT_INTEGER)
		do
			justification := No_justification
		ensure -- from FORMAT_INTEGER
				not_justified
		end

	no_separate_after_decimal
			-- Do not use separators after the decimal.
		do
			after_decimal_separate := False
		ensure
				not after_decimal_separate
		end

	point_decimal
			-- Use . as the decimal point.
		do
			decimal := '.'
		ensure
				decimal = '.'
		end

	remove_separator
			-- Remove the separator.
		require -- from  FORMAT_INTEGER
			True
		do
			separator := '%U'
			no_separate_after_decimal
		ensure -- from FORMAT_INTEGER
				separator = '%U'
		ensure then
				not after_decimal_separate
		end

	right_justify
			-- Put padding on left
			-- (from FORMAT_INTEGER)
		do
			justification := Right_justification
		ensure -- from FORMAT_INTEGER
				right_justified
		end

	separate_after_decimal
			-- Use separators after the decimal.
		do
			after_decimal_separate := True
		ensure
				after_decimal_separate
		end

	set_decimals (d: INTEGER_32)
			-- d decimals to be displayed.
		require
				d <= width
		do
			decimals := d
		ensure
				decimals = d
		end

	set_fill (c: CHARACTER_8)
			-- Fill numbers with c
			-- (from FORMAT_INTEGER)
		do
			fill_character := c
		ensure -- from FORMAT_INTEGER
				fill_character = c
		end

	set_separator (c: CHARACTER_8)
			-- Set the separator to c
			-- (from FORMAT_INTEGER)
		do
			separator := c
		ensure -- from FORMAT_INTEGER
				separator = c
		end

	set_sign (s: STRING_8)
			-- Set sign values for positive, zero, negative
			-- All values must be the same length.
			-- Stored as negative, zero, positive.
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
				s /= Void
				s.count >= 3
				s.count \\ 3 = 0
		do
			sign_string := s.twin
		ensure -- from FORMAT_INTEGER
			sign_set: sign_string ~ s
		end

	set_width (w: INTEGER_32)
			-- Set width to w
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			wide_enough: w >= 1
		do
			width := w
		ensure -- from FORMAT_INTEGER
				width = w
		end

	show_trailing_zeros
			-- Show 0.5000 as 0.5000.
		do
			trailing_zeros_shown := True
		ensure
			trailing_zeros_shown_set: trailing_zeros_shown
		end

	show_zero
			-- Show 0.5 as 0.5 .
		do
			zero_not_shown := False
		ensure
				not zero_not_shown
		end

	sign_cr_dr
			-- Set sign for CR/DR
			-- (from FORMAT_INTEGER)
		do
			sign_string := "CR  DR"
		ensure -- from FORMAT_INTEGER
				sign_string ~ "CR  DR"
		end

	sign_dr_cr
			-- Set sign for DR/CR
			-- (from FORMAT_INTEGER)
		do
			sign_string := "DR  CR"
		ensure -- from FORMAT_INTEGER
				sign_string ~ "DR  CR"
		end

	sign_floating_dollar
			-- Set sign for floating dollar.
			-- (from FORMAT_INTEGER)
		do
			sign_string := "$$$"
			sign_leading
		ensure -- from FORMAT_INTEGER
				sign_string ~ "$$$"
		end

	sign_floating_dollar_signed
			-- Set sign for floating dollar include sign.
			-- (from FORMAT_INTEGER)
		do
			sign_string := "-$ $+$"
			sign_leading
		ensure -- from FORMAT_INTEGER
				sign_string ~ "-$ $+$"
		end

	sign_ignore
			-- Do not show sign.
			-- (from FORMAT_INTEGER)
		do
			sign_format := Ignore_sign_value
		ensure -- from FORMAT_INTEGER
				ignore_sign
		end

	sign_leading
			-- Set the sign to lead
			-- (from FORMAT_INTEGER)
		do
			trailing_sign := False
		ensure -- from FORMAT_INTEGER
				leading_sign
		end

	sign_negative_only
			-- Show sign for negative numbers only.
			-- (from FORMAT_INTEGER)
		do
			sign_format := Sign_negative_value
		ensure -- from FORMAT_INTEGER
				show_sign_negative
		end

	sign_normal
			-- Set sign for - and +.
			-- (from FORMAT_INTEGER)
		do
			sign_string := "- +"
		ensure -- from FORMAT_INTEGER
				sign_string ~ "- +"
		end

	sign_positive_only
			-- Show sign for positive numbers only.
			-- (from FORMAT_INTEGER)
		do
			sign_format := Sign_positive_value
		ensure -- from FORMAT_INTEGER
				show_sign_positive
		end

	sign_show
			-- Show sign for all numbers.
			-- (from FORMAT_INTEGER)
		do
			sign_format := Show_sign_value
		ensure -- from FORMAT_INTEGER
				show_sign
		end

	sign_trailing
			-- Set the sign to trail
			-- (from FORMAT_INTEGER)
		do
			trailing_sign := True
		ensure -- from FORMAT_INTEGER
				trailing_sign
		end

	unbracket_negative
			-- Do not bracket negative numbers.
			-- (from FORMAT_INTEGER)
		do
			bracketted_negative := False
		ensure -- from FORMAT_INTEGER
				not bracketted_negative
		end

	underscore_separate
			-- Set the separator to be underscore.
		require -- from  FORMAT_INTEGER
			True
		do
			separator := '_'
			separate_after_decimal
		ensure -- from FORMAT_INTEGER
				separator = '_'
		ensure then
				after_decimal_separate
		end

	zero_fill
			-- Fill numbers with zeros.
			-- (from FORMAT_INTEGER)
		do
			fill_character := '0'
		ensure -- from FORMAT_INTEGER
				fill_character = '0'
		end
	
feature -- Conversion

	formatted (d: REAL_64): STRING_8
			-- Format d.
		local
			sign: INTEGER_32
			integral, fraction: REAL_64
			ints, fracs: STRING_8
			value: REAL_64
		do
			value := d
			sign := 1
			if d < 0.to_double then
				sign := -1
				value := - value
			end
			value := value + 5.to_double * 10 ^ (- decimals - 1).to_double
			integral := floor (value)
			fraction := floor ((value - integral) * 10 ^ (decimals + 1).to_double)
			if not no_separator then
				ints := split_integral (integral.out)
				if after_decimal_separate then
					fracs := separate_fraction (pad_fraction (fraction))
				else
					fracs := pad_fraction (fraction)
				end
			else
				ints := integral.out
				fracs := pad_fraction (fraction)
			end
			create Result.make (width)
			if integral /= 0.to_double or else not zero_not_shown then
				Result.append (ints)
			end
			if not Result.has ('e') then
				Result.extend (decimal)
				if decimals > 0 then
					Result.append (fracs)
				end
				if not ignore_sign then
					Result := process_sign (Result, sign)
				end
			end
			if justification /= No_justification and then Result.count < width then
				Result := justify (Result)
			end
		ensure
			exists: Result /= Void
			correct_length: not_justified or Result.count >= width
		end

	fm_formatted (i: INTEGER_32): STRING_8
			-- Format the integer.
			-- (from FORMAT_INTEGER)
		local
			sign: INTEGER_32
			unsigned: INTEGER_32
		do
			if i < 0 then
				sign := -1
				unsigned := - i
			elseif i > 0 then
				sign := 1
				unsigned := i
			end
			if not no_separator then
				Result := split_integral (unsigned.out)
			else
				Result := unsigned.out
			end
			if not ignore_sign or bracketted_negative then
				Result := process_sign (Result, sign)
			end
			if justification /= No_justification and then Result.count < width then
				Result := justify (Result)
			end
		ensure -- from FORMAT_INTEGER
			exists: Result /= Void
			correct_length: not_justified or Result.count >= width
		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: FORMAT_DOUBLE)
			-- 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: FORMAT_DOUBLE)
			-- 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: FORMAT_DOUBLE
			-- 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: FORMAT_DOUBLE)
			-- 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: FORMAT_DOUBLE
			-- 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: FORMAT_DOUBLE
			-- 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 FORMAT_DOUBLE
		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 FORMAT_DOUBLE
			-- 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

	Center_justification: INTEGER_32 = 2
			-- (from FORMAT_INTEGER)

	Ignore_sign_value: INTEGER_32 = 1
			-- (from FORMAT_INTEGER)

	justify (s: STRING_8): STRING_8
			-- Justify s.
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			room: s.count < width
			justification: justification /= No_justification
		local
			l, r: STRING_8
			i, t: INTEGER_32
		do
			Result := s
			if not centered then
				create l.make (width - s.count)
				from
					i := 1
				until
					i > l.capacity
				loop
					l.extend (fill_character)
					i := i + 1
				end
				if left_justified then
					Result.append (l)
				else
					Result.prepend (l)
				end
			else
				t := (width - s.count) // 2
				if 2 * t + s.count < width then
					create l.make (t + 1)
				else
					create l.make (t)
				end
				create r.make (t)
				from
					i := 1
				until
					i > r.capacity
				loop
					l.extend (fill_character);
					r.extend (fill_character)
					i := i + 1
				end
				if i = l.capacity then
					l.extend (fill_character)
				end;
				Result.prepend (l);
				Result.append (r)
			end
		end

	Left_justification: INTEGER_32 = 1
			-- (from FORMAT_INTEGER)

	No_justification: INTEGER_32 = 0
			-- (from FORMAT_INTEGER)

	pad_fraction (f: REAL_64): STRING_8
			-- Stretch or shrink f to length decimals .
		local
			i: INTEGER_32
		do
			Result := f.out;
			Result.remove_tail (1)
			if Result.count > decimals then
				Result := Result.substring (1, decimals)
			else
				from
				until
					Result.count = decimals
				loop
					Result.precede ('0')
				end
			end
			if not trailing_zeros_shown then
				from
					i := Result.count
				until
					i <= 1 or else Result.item (i) /= '0'
				loop
					Result.remove (i)
					i := i - 1
				end
			end
		ensure
			valid_result: trailing_zeros_shown implies Result.count = decimals
		end

	process_sign (s: STRING_8; sn: INTEGER_32): STRING_8
			-- Process sign related values.
			-- (from FORMAT_INTEGER)
		local
			sstring: detachable STRING_8
		do
			Result := s
			if bracketted_negative and sn = -1 then
				Result.precede ('(');
				Result.extend (')')
			end
			if ((show_sign_negative or show_sign) and sn = -1) or else ((show_sign_positive or show_sign) and sn = 1) or else (show_sign and sn = 0) then
				sstring := sign_value (sn)
			end
			if sstring /= Void then
				if trailing_sign then
					Result.append (sstring)
				else
					Result.prepend (sstring)
				end
			end
		end

	Right_justification: INTEGER_32 = 3
			-- (from FORMAT_INTEGER)

	separate_fraction (s: STRING_8): STRING_8
			-- Apply separators to the fraction.
		require
			efficiency: separator /= '%U'
		local
			count, sep_length: INTEGER_32
		do
			from
				count := 1
				create Result.make (width)
			until
				count > s.count - 3
			loop
				from
					sep_length := 0
				until
					sep_length = 3
				loop
					Result.extend (s.item (count))
					count := count + 1
					sep_length := sep_length + 1
				end;
				Result.extend (separator)
			end
			from
			until
				count > s.count
			loop
				Result.extend (s.item (count))
				count := count + 1
			end
		end

	Show_sign_value: INTEGER_32 = 0
			-- (from FORMAT_INTEGER)

	Sign_negative_value: INTEGER_32 = 3
			-- (from FORMAT_INTEGER)

	Sign_positive_value: INTEGER_32 = 2
			-- (from FORMAT_INTEGER)

	sign_size: INTEGER_32
			-- Size of the sign.
			-- (from FORMAT_INTEGER)
		do
			Result := sign_string.count // 3
		ensure -- from FORMAT_INTEGER
				Result * 3 = sign_string.count
		end

	sign_value (i: INTEGER_32): STRING_8
			-- Value of the sign.
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			correct_sign: -1 <= i and i <= 1
		local
			t: INTEGER_32
		do
			t := sign_size * (i + 1) + 1
			Result := sign_string.substring (t, t + sign_size - 1)
		end

	split_integral (s: STRING_8): STRING_8
			-- Apply separators to an integer
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			efficiency: separator /= '%U'
		local
			count, sep_length: INTEGER_32
		do
			from
				count := s.count
				create Result.make (width)
			until
				count <= 3
			loop
				from
					sep_length := 0
				until
					sep_length = 3
				loop
					Result.precede (s.item (count))
					count := count - 1
					sep_length := sep_length + 1
				end;
				Result.precede (separator)
			end
			from
			until
				count = 0
			loop
				Result.precede (s.item (count))
				count := count - 1
			end
		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
	
invariant
	separate_all: no_separator implies not after_decimal_separate

		-- from FORMAT_INTEGER
	sign_string_attached: sign_string /= Void
	sign_string_count: sign_string.count >= 3
	sign_string_equal_parts: sign_string.count \\ 3 = 0
	wide_enough: width >= 1
		No_justification <= justification and justification <= Right_justification

		-- 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 FORMAT_DOUBLE

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