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	description: "Formatter for non-integral numbers"
	status: "See notice at end of class"
	names: format_double
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	FORMAT_DOUBLE

create 
	make

feature -- Initialization

	make (w, d: INTEGER) is
		require
			reasonable_field: w >= 1
			reasonable_decimals: d <= w
		do
			set_defaults (w)
			decimals := d
			decimal := '.'
		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 = '.'
		end

	set_defaults (w: INTEGER) is
			-- (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 -- Access

	after_decimal_separate: BOOLEAN
			-- Use separators after the decimal?

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

	decimal: CHARACTER
			-- What is used for the decimal

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

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

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

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

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

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

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

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

	zero_not_shown: BOOLEAN
			-- Show 0.5 as .5 or 0.5?
	
feature {NONE} -- Access

	arc_cosine (v: DOUBLE): DOUBLE is
			-- Trigonometric arccosine of radian v
			-- in the range [0, pi]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"acos"
		end

	arc_sine (v: DOUBLE): DOUBLE is
			-- Trigonometric arcsine of radian v
			-- in the range [-pi/2, +pi/2]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"asin"
		end

	arc_tangent (v: DOUBLE): DOUBLE is
			-- Trigonometric arctangent of radian v
			-- in the range [-pi/2, +pi/2]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"atan"
		end

	ceiling (v: DOUBLE): DOUBLE is
			-- Least integral greater than or equal to v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"ceil"
		end

	cosine (v: DOUBLE): DOUBLE is
			-- Trigonometric cosine of radian v approximated
			-- in the range [-pi/4, +pi/4]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"cos"
		end

	dabs (v: DOUBLE): DOUBLE is
			-- Absolute of v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"fabs"
		end

	Euler: DOUBLE is 2.7182818284590452354
			-- Logarithm base
			-- (from MATH_CONST)

	exp (x: DOUBLE): DOUBLE is
			-- Exponential of v.
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		end

	floor (v: DOUBLE): DOUBLE is
			-- Greatest integral less than or equal to v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		end

	log (v: DOUBLE): DOUBLE is
			-- Natural logarithm of v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		end

	log10 (v: DOUBLE): DOUBLE is
			-- Base 10 logarithm of v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		end

	log_2 (v: DOUBLE): DOUBLE is
			-- Base 2 logarithm of v
			-- (from DOUBLE_MATH)
		local
			a: DOUBLE
		do
			a := 2.0
			Result := log (v) / log (a)
		end

	Pi: DOUBLE is 3.14159265358979323846
			-- (from MATH_CONST)

	sine (v: DOUBLE): DOUBLE is
			-- Trigonometric sine of radian v approximated
			-- in range [-pi/4, +pi/4]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"sin"
		end

	sqrt (v: DOUBLE): DOUBLE is
			-- Square root of v
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		end

	Sqrt2: DOUBLE is 1.41421356237309504880
			-- Square root of 2
			-- (from MATH_CONST)

	tangent (v: DOUBLE): DOUBLE is
			-- Trigonometric tangent of radian v approximated
			-- in range [-pi/4, +pi/4]
			-- (from DOUBLE_MATH)
		external
			"C | <math.h>"
		alias
			"tan"
		end
	
feature -- Status report

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

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

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

	not_justified: BOOLEAN is
			-- 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 is
			-- 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	set_sign (s: STRING) is
			-- 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 := clone (s)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal (s)
		end

	set_width (w: INTEGER) is
			-- 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_zero is
			-- Show 0.5 as 0.5 .
		do
			zero_not_shown := False
		ensure
			not zero_not_shown
		end

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

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

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

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

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

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

	sign_negative_only is
			-- 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 is
			-- Set sign for - and +.
			-- (from FORMAT_INTEGER)
		do
			sign_string := "- +"
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("- +")
		end

	sign_positive_only is
			-- 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 is
			-- Show sign for all numbers.
			-- (from FORMAT_INTEGER)
		do
			sign_format := show_sign_value
		ensure -- from FORMAT_INTEGER
			show_sign
		end

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

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

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

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

	formatted (d: DOUBLE): STRING is
			-- Format d.
		local
			sign: INTEGER
			integral, fraction: DOUBLE
			ints, fracs: STRING
			value: DOUBLE
		do
			value := d
			sign := 1
			if d < 0 then
				sign := - 1
				value := - value
			end
			value := value + 5 * 10 ^ (- decimals - 1)
			integral := floor (value)
			fraction := floor ((value - integral) * 10 ^ (decimals + 1))
			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 := clone (integral.out)
				fracs := pad_fraction (fraction)
			end
			create Result.make (width)
			if integral /= 0 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
	
feature {NONE} -- Conversion

	fm_formatted (i: INTEGER): STRING is
			-- Format the integer.
			-- (from FORMAT_INTEGER)
		local
			sign: INTEGER
			unsigned: INTEGER
		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 := clone (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 {NONE} -- Implementation

	Center_justification: INTEGER is 2
			-- (from FORMAT_INTEGER)

	Ignore_sign_value: INTEGER is 1
			-- (from FORMAT_INTEGER)

	justify (s: STRING): STRING is
			-- Justify s.
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			room: s.count < width
			justification: justification /= no_justification
		local
			l, r: STRING
			i, t: INTEGER
		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 is 1
			-- (from FORMAT_INTEGER)

	No_justification: INTEGER is 0
			-- (from FORMAT_INTEGER)

	pad_fraction (f: DOUBLE): STRING is
			-- Stretch or shrink f to length decimals .
		do
			Result := f.out
			Result.head (Result.count - 1)
			if Result.count > decimals then
				Result := Result.substring (1, decimals)
			else
				from
				until
					Result.count = decimals
				loop
					Result.precede ('0')
				end
			end
		ensure
			Result.count = decimals
		end

	process_sign (s: STRING; sn: INTEGER): STRING is
			-- Process sign related values.
			-- (from FORMAT_INTEGER)
		local
			sstring: STRING
		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 is 3
			-- (from FORMAT_INTEGER)

	separate_fraction (s: STRING): STRING is
			-- Apply separators to the fraction.
		require
			efficiency: separator /= '%U'
		local
			count, sep_length: INTEGER
		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 is 0
			-- (from FORMAT_INTEGER)

	Sign_negative_value: INTEGER is 3
			-- (from FORMAT_INTEGER)

	Sign_positive_value: INTEGER is 2
			-- (from FORMAT_INTEGER)

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

	split_integral (s: STRING): STRING is
			-- Apply separators to an integer
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			efficiency: separator /= '%U'
		local
			count, sep_length: INTEGER
		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
	
invariant

	separate_all: no_separator implies not after_decimal_separate
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)
		-- from FORMAT_INTEGER
	sign_string_constraint: sign_string /= void
	wide_enough: width >= 1
	no_justification <= justification and justification <= right_justification

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class FORMAT_DOUBLE


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