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module ActiveSupport
module NumberHelper
class NumberToHumanConverter < NumberConverter # :nodoc:
DECIMAL_UNITS = { 0 => :unit, 1 => :ten, 2 => :hundred, 3 => :thousand, 6 => :million, 9 => :billion, 12 => :trillion, 15 => :quadrillion,
-1 => :deci, -2 => :centi, -3 => :mili, -6 => :micro, -9 => :nano, -12 => :pico, -15 => :femto }
INVERTED_DECIMAL_UNITS = DECIMAL_UNITS.invert
self.namespace = :human
self.validate_float = true
def convert # :nodoc:
@number = RoundingHelper.new(options).round(number)
@number = Float(number)
# for backwards compatibility with those that didn't add strip_insignificant_zeros to their locale files
unless options.key?(:strip_insignificant_zeros)
options[:strip_insignificant_zeros] = true
end
units = opts[:units]
exponent = calculate_exponent(units)
@number = number / (10**exponent)
rounded_number = NumberToRoundedConverter.convert(number, options)
unit = determine_unit(units, exponent)
format.gsub("%n".freeze, rounded_number).gsub("%u".freeze, unit).strip
end
private
def format
options[:format] || translate_in_locale("human.decimal_units.format")
end
def determine_unit(units, exponent)
exp = DECIMAL_UNITS[exponent]
case units
when Hash
units[exp] || ""
when String, Symbol
I18n.translate("#{units}.#{exp}", locale: options[:locale], count: number.to_i)
else
translate_in_locale("human.decimal_units.units.#{exp}", count: number.to_i)
end
end
def calculate_exponent(units)
exponent = number != 0 ? Math.log10(number.abs).floor : 0
unit_exponents(units).find { |e| exponent >= e } || 0
end
def unit_exponents(units)
case units
when Hash
units
when String, Symbol
I18n.translate(units.to_s, locale: options[:locale], raise: true)
when nil
translate_in_locale("human.decimal_units.units", raise: true)
else
raise ArgumentError, ":units must be a Hash or String translation scope."
end.keys.map { |e_name| INVERTED_DECIMAL_UNITS[e_name] }.sort_by(&:-@)
end
end
end
end
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