module Padrino
module Helpers
##
# Provides methods for converting numbers into formatted strings.
# Methods are provided for phone numbers, currency, percentage,
# precision, positional notation, and file size.
#
# Adapted from Rails Number Helpers.
#
module NumberHelpers
##
# Formats a +number+ into a currency string (e.g., $13.65). You can customize the format
# in the +options+ hash.
#
# @param [Float] number
# Currency value to format.
# @param [Hash] options
# Options for currency conversion.
# @option options [Fixnum] :precision (2)
# Sets the level of precision.
# @option options [String] :unit ("$")
# Sets the denomination of the currency.
# @option options [String] :separator (".")
# Sets the separator between the units.
# @option options [String] :delimiter (",")
# Sets the thousands delimiter.
# @option options [String] :format ("%u%n")
# Sets the format of the output string. The field types are:
# %u The currency unit
# %n The number
#
# @return [String] The formatted representation of the currency
#
# @example
# number_to_currency(1234567890.50) # => $1,234,567,890.50
# number_to_currency(1234567890.506) # => $1,234,567,890.51
# number_to_currency(1234567890.506, :precision => 3) # => $1,234,567,890.506
# number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "")
# # => £1234567890,50
# number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "", :format => "%n %u")
# # => 1234567890,50 £
#
# @api public
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
##
# Formats a +number+ as a percentage string (e.g., 65%). You can customize the
# format in the +options+ hash.
#
# @param [Fixnum, Float] number
# Percentage value to format.
# @param [Hash] options
# Options for percentage conversion.
# @option options [Fixnum] :precision (3)
# Sets the level of precision.
# @option options [String] :separator (".")
# Sets the separator between the units.
# @option options [String] :delimiter ("")
# Sets the thousands delimiter
#
# @return [String] The formatted representation of the percentage
#
# @example
# number_to_percentage(100) # => 100.000%
# number_to_percentage(100, :precision => 0) # => 100%
# number_to_percentage(1000, :delimiter => '.', :separator => ',') # => 1.000,000%
# number_to_percentage(302.24398923423, :precision => 5) # => 302.24399%
#
# @api public
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
##
# Formats a +number+ with grouped thousands using +delimiter+ (e.g., 12,324). You can
# customize the format in the +options+ hash.
#
# @overload number_with_delimiter(number, options={})
# @param [Fixnum, Float] number
# Number value to format.
# @param [Hash] options
# Options for formatter.
# @option options [String] :delimiter (", ")
# Sets the thousands delimiter
# @option options [String] :separator (".")
# Sets the separator between the units.
#
# @return [String] The formatted representation of the number
#
# @example
# number_with_delimiter(12345678) # => 12,345,678
# number_with_delimiter(12345678.05) # => 12,345,678.05
# number_with_delimiter(12345678, :delimiter => ".") # => 12.345.678
# number_with_delimiter(12345678, :separator => ",") # => 12,345,678
# number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
# # => 98 765 432,98
#
# @api public
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
##
# Formats a +number+ with the specified level of <tt>:precision</tt> (e.g., 112.32 has a precision of 2).
# You can customize the format in the +options+ hash.
#
# @overload number_with_precision(number, options={})
# @param [Fixnum, Float] number
# Number value to format.
# @param [Hash] options
# Options for formatter.
# @option options [Fixnum] :precision (3)
# Sets the level of precision.
# @option options [String] :separator (".")
# Sets the separator between the units.
# @option options [String] :delimiter ("")
# Sets the thousands delimiter
#
# @return [String] The formatted representation of the number
#
# @example
# number_with_precision(111.2345) # => 111.235
# number_with_precision(111.2345, :precision => 2) # => 111.23
# number_with_precision(13, :precision => 5) # => 13.00000
# number_with_precision(389.32314, :precision => 0) # => 389
# number_with_precision(1111.2345, :precision => 2, :separator => ',', :delimiter => '.')
# # => 1.111,23
#
# @api public
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
# The units available for storage formatting.
STORAGE_UNITS = [:byte, :kb, :mb, :gb, :tb].freeze
##
# Formats the bytes in +size+ into a more understandable representation
# (e.g., giving it 1500 yields 1.5 KB). This method is useful for
# reporting file sizes to users. This method returns nil if
# +size+ cannot be converted into a number. You can customize the
# format in the +options+ hash.
#
#
# @overload number_to_human_size(number, options={})
# @param [Fixnum] number
# Number value to format.
# @param [Hash] options
# Options for formatter.
# @option options [Fixnum] :precision (1)
# Sets the level of precision.
# @option options [String] :separator (".")
# Sets the separator between the units.
# @option options [String] :delimiter ("")
# Sets the thousands delimiter
#
# @return [String] The formatted representation of bytes
#
# @example
# number_to_human_size(123) # => 123 Bytes
# number_to_human_size(1234) # => 1.2 KB
# number_to_human_size(12345) # => 12.1 KB
# number_to_human_size(1234567) # => 1.2 MB
# number_to_human_size(1234567890) # => 1.1 GB
# number_to_human_size(1234567890123) # => 1.1 TB
# number_to_human_size(1234567, :precision => 2) # => 1.18 MB
# number_to_human_size(483989, :precision => 0) # => 473 KB
# number_to_human_size(1234567, :precision => 2, :separator => ',') # => 1,18 MB
#
# @api public
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
end # NumberHelpers
end # Helpers
end # Padrino