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module ActiveSupport
module NumberHelper
class NumberToRoundedConverter < NumberConverter # :nodoc:
self.namespace = :precision
self.validate_float = true
def convert
precision = options.delete :precision
if precision
case number
when Float, String
@number = BigDecimal(number.to_s)
when Rational
@number = BigDecimal(number, digit_count(number.to_i) + precision)
else
@number = number.to_d
end
if options.delete(:significant) && precision > 0
digits, rounded_number = digits_and_rounded_number(precision)
precision -= digits
precision = 0 if precision < 0 # don't let it be negative
else
rounded_number = number.round(precision)
rounded_number = rounded_number.to_i if precision == 0 && rounded_number.finite?
rounded_number = rounded_number.abs if rounded_number.zero? # prevent showing negative zeros
end
formatted_string =
if BigDecimal === rounded_number && rounded_number.finite?
s = rounded_number.to_s('F') + '0'*precision
a, b = s.split('.', 2)
a + '.' + b[0, precision]
else
"%00.#{precision}f" % rounded_number
end
else
formatted_string = number
end
delimited_number = NumberToDelimitedConverter.convert(formatted_string, options)
format_number(delimited_number)
end
private
def digits_and_rounded_number(precision)
if zero?
[1, 0]
else
digits = digit_count(number)
multiplier = 10 ** (digits - precision)
rounded_number = calculate_rounded_number(multiplier)
digits = digit_count(rounded_number) # After rounding, the number of digits may have changed
[digits, rounded_number]
end
end
def calculate_rounded_number(multiplier)
(number / BigDecimal.new(multiplier.to_f.to_s)).round * multiplier
end
def digit_count(number)
number.zero? ? 1 : (Math.log10(absolute_number(number)) + 1).floor
end
def strip_insignificant_zeros
options[:strip_insignificant_zeros]
end
def format_number(number)
if strip_insignificant_zeros
escaped_separator = Regexp.escape(options[:separator])
number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '')
else
number
end
end
def absolute_number(number)
number.respond_to?(:abs) ? number.abs : number.to_d.abs
end
def zero?
number.respond_to?(:zero?) ? number.zero? : number.to_d.zero?
end
end
end
end
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