Module: Aerogel::I18n::NumberHelper

Included in:
Aerogel::I18n
Defined in:
lib/aerogel/core/i18n/number_helper.rb

Constant Summary collapse

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}
STORAGE_UNITS = 
[:byte, :kb, :mb, :gb, :tb]

Instance Method Summary collapse

Instance Method Details

#number_to_human_size(number, options = {}) ⇒ Object

TODO: use NumberHelper from ‘activesupport ~> 4.0’, at the moment it is incompatible with mongoid,



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# File 'lib/aerogel/core/i18n/number_helper.rb', line 83

def number_to_human_size(number, options = {})
  options.symbolize_keys!

  number = begin
    Float(number)
  rescue ArgumentError, TypeError
    if options[:raise]
      raise # InvalidNumberError, number
    else
      return number
    end
  end

  defaults = ::I18n.translate(:'number.format', :locale => options[:locale], :default => {})
  human    = ::I18n.translate(:'number.human.format', :locale => options[:locale], :default => {})
  defaults = defaults.merge(human)

  options = options.reverse_merge(defaults)
  #for backwards compatibility with those that didn't add strip_insignificant_zeros to their locale files
  options[:strip_insignificant_zeros] = true if not options.key?(:strip_insignificant_zeros)

  storage_units_format = ::I18n.translate(:'number.human.storage_units.format', :locale => options[:locale], :raise => true)

  base = options[:prefix] == :si ? 1000 : 1024

  if number.to_i < base
    unit = ::I18n.translate(:'number.human.storage_units.units.byte', :locale => options[:locale], :count => number.to_i, :raise => true)
    storage_units_format.gsub(/%n/, number.to_i.to_s).gsub(/%u/, unit).html_safe
  else
    max_exp  = STORAGE_UNITS.size - 1
    exponent = (Math.log(number) / Math.log(base)).to_i # Convert to base
    exponent = max_exp if exponent > max_exp # we need this to avoid overflow for the highest unit
    number  /= base ** exponent

    unit_key = STORAGE_UNITS[exponent]
    unit = ::I18n.translate(:"number.human.storage_units.units.#{unit_key}", :locale => options[:locale], :count => number, :raise => true)

    formatted_number = number_with_precision(number, options)
    storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit).html_safe
  end
end

#number_with_delimiter(number, options = {}) ⇒ Object 



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# File 'lib/aerogel/core/i18n/number_helper.rb', line 4

def number_with_delimiter(number, options = {})
  options.symbolize_keys!

  options[:delimiter] = ERB::Util.html_escape(options[:delimiter]) if options[:delimiter]
  options[:separator] = ERB::Util.html_escape(options[:separator]) if options[:separator]

  begin
    Float(number)
  rescue ArgumentError, TypeError
    if options[:raise]
      raise # InvalidNumberError, number
    else
      return number
    end
  end

  defaults = ::I18n.translate(:'number.format', :locale => options[:locale], :default => {})
  options = options.reverse_merge(defaults)

  parts = number.to_s.to_str.split('.')
  parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")
  parts.join(options[:separator]).html_safe

end

#number_with_precision(number, options = {}) ⇒ Object 



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# File 'lib/aerogel/core/i18n/number_helper.rb', line 32

def number_with_precision(number, options = {})
  options.symbolize_keys!

  number = begin
    Float(number)
  rescue ArgumentError, TypeError
    if options[:raise]
      raise # InvalidNumberError, number
    else
      return number
    end
  end

  defaults           = ::I18n.translate(:'number.format', :locale => options[:locale], :default => {})
  precision_defaults = ::I18n.translate(:'number.precision.format', :locale => options[:locale], :default => {})
  defaults           = defaults.merge(precision_defaults)

  options = options.reverse_merge(defaults)  # Allow the user to unset default values: Eg.: :significant => false
  precision = options.delete :precision
  significant = options.delete :significant
  strip_insignificant_zeros = options.delete :strip_insignificant_zeros

  if significant and precision > 0
    if number == 0
      digits, rounded_number = 1, 0
    else
      digits = (Math.log10(number.abs) + 1).floor
      rounded_number = (BigDecimal.new(number.to_s) / BigDecimal.new((10 ** (digits - precision)).to_f.to_s)).round.to_f * 10 ** (digits - precision)
      digits = (Math.log10(rounded_number.abs) + 1).floor # After rounding, the number of digits may have changed
    end
    precision -= digits
    precision = precision > 0 ? precision : 0  #don't let it be negative
  else
    rounded_number = BigDecimal.new(number.to_s).round(precision).to_f
  end
  formatted_number = number_with_delimiter("%01.#{precision}f" % rounded_number, options)
  if strip_insignificant_zeros
    escaped_separator = Regexp.escape(options[:separator])
    formatted_number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '').html_safe
  else
    formatted_number
  end

end