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# frozen_string_literal: true
module ActiveSupport
module NumberHelper
class RoundingHelper # :nodoc:
attr_reader :options
def initialize(options)
@options = options
end
def round(number)
precision = absolute_precision(number)
return number unless precision
rounded_number = convert_to_decimal(number).round(precision, options.fetch(:round_mode, :default).to_sym)
rounded_number.zero? ? rounded_number.abs : rounded_number # prevent showing negative zeros
end
def digit_count(number)
return 1 if number.zero?
(Math.log10(number.abs) + 1).floor
end
private
def convert_to_decimal(number)
case number
when Float, String
BigDecimal(number.to_s)
when Rational
BigDecimal(number, digit_count(number.to_i) + options[:precision])
else
number.to_d
end
end
def absolute_precision(number)
if options[:significant] && options[:precision] > 0
options[:precision] - digit_count(convert_to_decimal(number))
else
options[:precision]
end
end
end
end
end
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