module Padrino::Helpers::NumberHelpers

def number_to_currency(number, options = {})


# => 1234567890,50 £
number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "", :format => "%n %u")
# => £1234567890,50
number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "")

number_to_currency(1234567890.506, :precision => 3) # => $1,234,567,890.506
number_to_currency(1234567890.506) # => $1,234,567,890.51
number_to_currency(1234567890.50) # => $1,234,567,890.50

==== Examples

%n The number
%u The currency unit

:format:: Sets the format of the output string (defaults to "%u%n"). The field types are:
:delimiter:: Sets the thousands delimiter (defaults to ",").
:separator:: Sets the separator between the units (defaults to ".").
:unit:: Sets the denomination of the currency (defaults to "$").
:precision:: Sets the level of precision (defaults to 2).

==== Options

in the +options+ hash.
Formats a +number+ into a currency string (e.g., $13.65). You can customize the format
# 
def number_to_currency(number, options = {})
  options.symbolize_keys!
  defaults  = I18n.translate(:'number.format', :locale => options[:locale], :raise => true) rescue {}
  currency  = I18n.translate(:'number.currency.format', :locale => options[:locale], :raise => true) rescue {}
  defaults  = defaults.merge(currency)
  precision = options[:precision] || defaults[:precision]
  unit      = options[:unit]      || defaults[:unit]
  separator = options[:separator] || defaults[:separator]
  delimiter = options[:delimiter] || defaults[:delimiter]
  format    = options[:format]    || defaults[:format]
  separator = '' if precision == 0
  begin
    format.gsub(/%n/, number_with_precision(number,
      :precision => precision,
      :delimiter => delimiter,
      :separator => separator)
    ).gsub(/%u/, unit)
  rescue
    number
  end
end

def number_to_human_size(number, *args)


number_to_human_size(483989, 0) # => 473 KB
number_to_human_size(1234567, 2) # => 1.18 MB

+precision+ as its optional second parameter:
You can still use number_to_human_size with the old API that accepts the

helper.number_to_human_size(524288000, :precision=>5) # => "500 MB"
helper.number_to_human_size(1234567890123, :precision => 5) # => "1.12283 TB"

specified precision:
Zeros after the decimal point are always stripped out, regardless of the

number_to_human_size(1234567, :precision => 2, :separator => ',') # => 1,18 MB
number_to_human_size(483989, :precision => 0) # => 473 KB
number_to_human_size(1234567, :precision => 2) # => 1.18 MB
number_to_human_size(1234567890123) # => 1.1 TB
number_to_human_size(1234567890) # => 1.1 GB
number_to_human_size(1234567) # => 1.2 MB
number_to_human_size(12345) # => 12.1 KB
number_to_human_size(1234) # => 1.2 KB
number_to_human_size(123) # => 123 Bytes

==== Examples

:delimiter:: Sets the thousands delimiter (defaults to "").
:separator:: Sets the separator between the units (defaults to ".").
:precision:: Sets the level of precision (defaults to 1).

==== Options

format in the +options+ hash.
+size+ cannot be converted into a number. You can customize the
reporting file sizes to users. This method returns nil if
(e.g., giving it 1500 yields 1.5 KB). This method is useful for
Formats the bytes in +size+ into a more understandable representation
# 
def number_to_human_size(number, *args)
  return nil if number.nil?
  options = args.extract_options!
  options.symbolize_keys!
  defaults = I18n.translate(:'number.format', :locale => options[:locale], :raise => true) rescue {}
  human    = I18n.translate(:'number.human.format', :locale => options[:locale], :raise => true) rescue {}
  defaults = defaults.merge(human)
  precision ||= (options[:precision] || defaults[:precision])
  separator ||= (options[:separator] || defaults[:separator])
  delimiter ||= (options[:delimiter] || defaults[:delimiter])
  storage_units_format = I18n.translate(:'number.human.storage_units.format', :locale => options[:locale], :raise => true)
  if number.to_i < 1024
    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)
  else
    max_exp  = STORAGE_UNITS.size - 1
    number   = Float(number)
    exponent = (Math.log(number) / Math.log(1024)).to_i # Convert to base 1024
    exponent = max_exp if exponent > max_exp # we need this to avoid overflow for the highest unit
    number  /= 1024 ** exponent
    unit_key = STORAGE_UNITS[exponent]
    unit = I18n.translate(:"number.human.storage_units.units.#{unit_key}", :locale => options[:locale], :count => number, :raise => true)
    begin
      escaped_separator = Regexp.escape(separator)
      formatted_number = number_with_precision(number,
        :precision => precision,
        :separator => separator,
        :delimiter => delimiter
      ).sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '')
      storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit)
    rescue
      number
    end
  end
end

def number_to_percentage(number, options = {})


number_to_percentage(302.24398923423, :precision => 5) # => 302.24399%
number_to_percentage(1000, :delimiter => '.', :separator => ',') # => 1.000,000%
number_to_percentage(100, :precision => 0) # => 100%
number_to_percentage(100) # => 100.000%

==== Examples

:delimiter:: Sets the thousands delimiter (defaults to "").
:separator:: Sets the separator between the units (defaults to ".").
:precision:: Sets the level of precision (defaults to 3).

==== Options

format in the +options+ hash.
Formats a +number+ as a percentage string (e.g., 65%). You can customize the
# 
def number_to_percentage(number, options = {})
  options.symbolize_keys!
  defaults   = I18n.translate(:'number.format', :locale => options[:locale], :raise => true) rescue {}
  percentage = I18n.translate(:'number.percentage.format', :locale => options[:locale], :raise => true) rescue {}
  defaults  = defaults.merge(percentage)
  precision = options[:precision] || defaults[:precision]
  separator = options[:separator] || defaults[:separator]
  delimiter = options[:delimiter] || defaults[:delimiter]
  begin
    number_with_precision(number,
      :precision => precision,
      :separator => separator,
      :delimiter => delimiter) + "%"
  rescue
    number
  end
end

def number_with_delimiter(number, *args)


number_with_delimiter(12345678.05, ".", ",") # => 12.345.678,05
number_with_delimiter(12345678, " ") # => 12 345.678

optional third parameter:
+delimiter+ as its optional second and the +separator+ as its
You can still use number_with_delimiter with the old API that accepts the

# => 98 765 432,98
number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
number_with_delimiter(12345678, :separator => ",") # => 12,345,678
number_with_delimiter(12345678, :delimiter => ".") # => 12.345.678
number_with_delimiter(12345678.05) # => 12,345,678.05
number_with_delimiter(12345678) # => 12,345,678

==== Examples

:separator:: Sets the separator between the units (defaults to ".").
:delimiter:: Sets the thousands delimiter (defaults to ",").

==== Options

customize the format in the +options+ hash.
Formats a +number+ with grouped thousands using +delimiter+ (e.g., 12,324). You can
# 
def number_with_delimiter(number, *args)
  options = args.extract_options!
  options.symbolize_keys!
  defaults = I18n.translate(:'number.format', :locale => options[:locale], :raise => true) rescue {}
  delimiter ||= (options[:delimiter] || defaults[:delimiter])
  separator ||= (options[:separator] || defaults[:separator])
  begin
    parts = number.to_s.split('.')
    parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{delimiter}")
    parts.join(separator)
  rescue
    number
  end
end

def number_with_precision(number, *args)


number_with_precision(number_with_precision(111.2345, 2) # => 111.23

+precision+ as its optional second parameter:
You can still use number_with_precision with the old API that accepts the

# => 1.111,23
number_with_precision(1111.2345, :precision => 2, :separator => ',', :delimiter => '.')
number_with_precision(389.32314, :precision => 0) # => 389
number_with_precision(13, :precision => 5) # => 13.00000
number_with_precision(111.2345, :precision => 2) # => 111.23
number_with_precision(111.2345) # => 111.235

==== Examples

:delimiter:: Sets the thousands delimiter (defaults to "").
:separator:: Sets the separator between the units (defaults to ".").
:precision:: Sets the level of precision (defaults to 3).

==== Options

You can customize the format in the +options+ hash.
Formats a +number+ with the specified level of :precision (e.g., 112.32 has a precision of 2).
# 
def number_with_precision(number, *args)
  options = args.extract_options!
  options.symbolize_keys!
  defaults           = I18n.translate(:'number.format', :locale => options[:locale], :raise => true) rescue {}
  precision_defaults = I18n.translate(:'number.precision.format', :locale => options[:locale],
                                                                  :raise => true) rescue {}
  defaults           = defaults.merge(precision_defaults)
  precision ||= (options[:precision] || defaults[:precision])
  separator ||= (options[:separator] || defaults[:separator])
  delimiter ||= (options[:delimiter] || defaults[:delimiter])
  begin
    rounded_number = (Float(number) * (10 ** precision)).round.to_f / 10 ** precision
    number_with_delimiter("%01.#{precision}f" % rounded_number,
      :separator => separator,
      :delimiter => delimiter)
  rescue
    number
  end
end