indexing
	description: "Formatter for non-integral numbers"
	names: format_double

class interface
	FORMAT_DOUBLE

create 

	make (w, d: INTEGER)
		require
			reasonable_field: w >= 1;
			reasonable_decimals: d <= w
		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 = '.'

feature -- Initialization

	make (w, d: INTEGER)
		require
			reasonable_field: w >= 1;
			reasonable_decimals: d <= w
		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 = '.'

	set_defaults (w: INTEGER)
			-- (from FORMAT_INTEGER)
		require -- from FORMAT_INTEGER
			reasonable_field: w >= 1
		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
	
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 -- Status report

	centered: BOOLEAN
			-- Are numbers to be formatted centered?
			-- (from FORMAT_INTEGER)

	ignore_sign: BOOLEAN
			-- Ignore the sign of a number?
			-- (from FORMAT_INTEGER)

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

	left_justified: BOOLEAN
			-- Are numbers to be formatted with spaces on the right?
			-- (from FORMAT_INTEGER)

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

	not_justified: BOOLEAN
			-- Are numbers to be formatted in smallest string possible
			-- (from FORMAT_INTEGER)

	right_justified: BOOLEAN
			-- Are numbers to be formatted with spaces on the left?
			-- (from FORMAT_INTEGER)

	show_sign: BOOLEAN
			-- Are numbers to show sign whether positive or negative?
			-- (from FORMAT_INTEGER)

	show_sign_negative: BOOLEAN
			-- Are numbers to show sign only when negative?
			-- (from FORMAT_INTEGER)

	show_sign_positive: BOOLEAN
			-- Are numbers to show sign only when positive?
			-- (from FORMAT_INTEGER)

feature -- Status setting

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

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

	bracket_negative
			-- Bracket negative numbers.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			bracketted_negative

	center_justify
			-- Put padding on right and left
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			centered

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

	comma_separate
			-- Set the separator to be comma.
		ensure -- from FORMAT_INTEGER
			separator = ','
		ensure then
			after_decimal_separate

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

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

	hide_zero
			-- Show 0.5 as .5 .
		ensure
			zero_not_shown

	left_justify
			--Put padding on right
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			left_justified

	no_justify
			-- Always return the smallest string possible
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			not_justified

	no_separate_after_decimal
			-- Do not use separators after the decimal.
		ensure
			not after_decimal_separate

	point_decimal
			-- Use . as the decimal point.
		ensure
			decimal = '.'

	remove_separator
			-- Remove the separator.
		ensure -- from FORMAT_INTEGER
			separator = '%U'
		ensure then
			not after_decimal_separate

	right_justify
			-- Put padding on left
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			right_justified

	separate_after_decimal
			-- Use separators after the decimal.
		ensure
			after_decimal_separate

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

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

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

	set_sign (s: STRING)
			-- 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
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal (s)

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

	show_zero
			-- Show 0.5 as 0.5 .
		ensure
			not zero_not_shown

	sign_cr_dr
			-- Set sign for CR/DR
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("CR  DR")

	sign_dr_cr
			-- Set sign for DR/CR
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("DR  CR")

	sign_floating_dollar
			-- Set sign for floating dollar.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("$$$")

	sign_floating_dollar_signed
			-- Set sign for floating dollar include sign.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("-$ $+$")

	sign_ignore
			-- Do not show sign.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			ignore_sign

	sign_leading
			-- Set the sign to lead
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			leading_sign

	sign_negative_only
			-- Show sign for negative numbers only.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			show_sign_negative

	sign_normal
			-- Set sign for - and +.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			sign_string.is_equal ("- +")

	sign_positive_only
			-- Show sign for positive numbers only.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			show_sign_positive

	sign_show
			-- Show sign for all numbers.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			show_sign

	sign_trailing
			-- Set the sign to trail
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			trailing_sign

	unbracket_negative
			-- Do not bracket negative numbers.
			-- (from FORMAT_INTEGER)
		ensure -- from FORMAT_INTEGER
			not bracketted_negative

	underscore_separate
			-- Set the separator to be underscore.
		ensure -- from FORMAT_INTEGER
			separator = '_'
		ensure then
			after_decimal_separate

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

	formatted (d: DOUBLE): STRING
			-- Format d.
		ensure
			exists: Result /= void;
			correct_width: Result.count >= width
	
invariant

		-- from GENERAL
	reflexive_equality: standard_is_equal (Current);
	reflexive_conformance: conforms_to (Current);
	separate_all: no_separator implies not after_decimal_separate;
		-- from FORMAT_INTEGER
	sign_string_constraint: sign_string /= void;
	wide_enough: width >= 1;

end -- class FORMAT_DOUBLE