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number_helper.rb
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number_helper.rb
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# encoding: utf-8
require 'active_support/core_ext/big_decimal/conversions'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/string/output_safety'
module ActionView
# = Action View Number Helpers
module Helpers #:nodoc:
# Provides methods for converting numbers into formatted strings.
# Methods are provided for phone numbers, currency, percentage,
# precision, positional notation, file size and pretty printing.
#
# Most methods expect a +number+ argument, and will return it
# unchanged if can't be converted into a valid number.
module NumberHelper
DEFAULT_CURRENCY_VALUES = { :format => "%u%n", :negative_format => "-%u%n", :unit => "$", :separator => ".", :delimiter => ",",
:precision => 2, :significant => false, :strip_insignificant_zeros => false }
# Raised when argument +number+ param given to the helpers is invalid and
# the option :raise is set to +true+.
class InvalidNumberError < StandardError
attr_accessor :number
def initialize(number)
@number = number
end
end
# Formats a +number+ into a US phone number (e.g., (555) 123-9876). You can customize the format
# in the +options+ hash.
#
# ==== Options
#
# * <tt>:area_code</tt> - Adds parentheses around the area code.
# * <tt>:delimiter</tt> - Specifies the delimiter to use (defaults to "-").
# * <tt>:extension</tt> - Specifies an extension to add to the end of the
# generated number.
# * <tt>:country_code</tt> - Sets the country code for the phone number.
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# ==== Examples
#
# number_to_phone(5551234) # => 555-1234
# number_to_phone("5551234") # => 555-1234
# number_to_phone(1235551234) # => 123-555-1234
# number_to_phone(1235551234, :area_code => true) # => (123) 555-1234
# number_to_phone(1235551234, :delimiter => " ") # => 123 555 1234
# number_to_phone(1235551234, :area_code => true, :extension => 555) # => (123) 555-1234 x 555
# number_to_phone(1235551234, :country_code => 1) # => +1-123-555-1234
# number_to_phone("123a456") # => 123a456
#
# number_to_phone("1234a567", :raise => true) # => InvalidNumberError
#
# number_to_phone(1235551234, :country_code => 1, :extension => 1343, :delimiter => ".")
# # => +1.123.555.1234 x 1343
def number_to_phone(number, options = {})
return unless number
options = options.symbolize_keys
parse_float(number, true) if options[:raise]
number = number.to_s.strip
area_code = options[:area_code]
delimiter = options[:delimiter] || "-"
extension = options[:extension]
country_code = options[:country_code]
if area_code
number.gsub!(/(\d{1,3})(\d{3})(\d{4}$)/,"(\\1) \\2#{delimiter}\\3")
else
number.gsub!(/(\d{0,3})(\d{3})(\d{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
number.slice!(0, 1) if number.start_with?(delimiter) && !delimiter.blank?
end
str = ''
str << "+#{country_code}#{delimiter}" unless country_code.blank?
str << number
str << " x #{extension}" unless extension.blank?
ERB::Util.html_escape(str)
end
# Formats a +number+ into a currency string (e.g., $13.65). You can customize the format
# in the +options+ hash.
#
# ==== Options
#
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current locale).
# * <tt>:precision</tt> - Sets the level of precision (defaults to 2).
# * <tt>:unit</tt> - Sets the denomination of the currency (defaults to "$").
# * <tt>:separator</tt> - Sets the separator between the units (defaults to ".").
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to ",").
# * <tt>:format</tt> - Sets the format for non-negative numbers (defaults to "%u%n").
# Fields are <tt>%u</tt> for the currency, and <tt>%n</tt>
# for the number.
# * <tt>:negative_format</tt> - Sets the format for negative numbers (defaults to prepending
# an hyphen to the formatted number given by <tt>:format</tt>).
# Accepts the same fields than <tt>:format</tt>, except
# <tt>%n</tt> is here the absolute value of the number.
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# ==== Examples
#
# 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(1234567890.506, :locale => :fr) # => 1 234 567 890,51 €
# number_to_currency("123a456") # => $123a456
#
# number_to_currency("123a456", :raise => true) # => InvalidNumberError
#
# number_to_currency(-1234567890.50, :negative_format => "(%u%n)")
# # => ($1,234,567,890.50)
# number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "")
# # => £1234567890,50
# number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "", :format => "%n %u")
# # => 1234567890,50 £
def number_to_currency(number, options = {})
return unless number
options = options.symbolize_keys
currency = translations_for('currency', options[:locale])
currency[:negative_format] ||= "-" + currency[:format] if currency[:format]
defaults = DEFAULT_CURRENCY_VALUES.merge(defaults_translations(options[:locale])).merge!(currency)
defaults[:negative_format] = "-" + options[:format] if options[:format]
options = defaults.merge!(options)
unit = options.delete(:unit)
format = options.delete(:format)
if number.to_f < 0
format = options.delete(:negative_format)
number = number.respond_to?("abs") ? number.abs : number.sub(/^-/, '')
end
begin
value = number_with_precision(number, options.merge(:raise => true))
format.gsub('%n', value).gsub('%u', unit).html_safe
rescue InvalidNumberError => e
if options[:raise]
raise
else
formatted_number = format.gsub('%n', e.number).gsub('%u', unit)
e.number.to_s.html_safe? ? formatted_number.html_safe : formatted_number
end
end
end
# Formats a +number+ as a percentage string (e.g., 65%). You can customize the format in the +options+ hash.
#
# ==== Options
#
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current
# locale).
# * <tt>:precision</tt> - Sets the precision of the number (defaults to 3).
# * <tt>:significant</tt> - If +true+, precision will be the # of significant_digits. If +false+,
# the # of fractional digits (defaults to +false+).
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults
# to ".").
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to "").
# * <tt>:strip_insignificant_zeros</tt> - If +true+ removes insignificant zeros after the decimal separator
# (defaults to +false+).
# * <tt>:format</tt> - Specifies the format of the percentage string
# The number field is <tt>%n</tt> (defaults to "%n%").
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# ==== Examples
#
# number_to_percentage(100) # => 100.000%
# number_to_percentage("98") # => 98.000%
# 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%
# number_to_percentage(1000, :locale => :fr) # => 1 000,000%
# number_to_percentage("98a") # => 98a%
# number_to_percentage(100, :format => "%n %") # => 100 %
#
# number_to_percentage("98a", :raise => true) # => InvalidNumberError
def number_to_percentage(number, options = {})
return unless number
options = options.symbolize_keys
defaults = format_translations('percentage', options[:locale])
options = defaults.merge!(options)
format = options[:format] || "%n%"
begin
value = number_with_precision(number, options.merge(:raise => true))
format.gsub(/%n/, value).html_safe
rescue InvalidNumberError => e
if options[:raise]
raise
else
formatted_number = format.gsub(/%n/, e.number)
e.number.to_s.html_safe? ? formatted_number.html_safe : formatted_number
end
end
end
# Formats a +number+ with grouped thousands using +delimiter+ (e.g., 12,324). You can
# customize the format in the +options+ hash.
#
# ==== Options
#
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current locale).
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to ",").
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults to ".").
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# ==== Examples
#
# number_with_delimiter(12345678) # => 12,345,678
# number_with_delimiter("123456") # => 123,456
# number_with_delimiter(12345678.05) # => 12,345,678.05
# number_with_delimiter(12345678, :delimiter => ".") # => 12.345.678
# number_with_delimiter(12345678, :delimiter => ",") # => 12,345,678
# number_with_delimiter(12345678.05, :separator => " ") # => 12,345,678 05
# number_with_delimiter(12345678.05, :locale => :fr) # => 12 345 678,05
# number_with_delimiter("112a") # => 112a
# number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
# # => 98 765 432,98
#
# number_with_delimiter("112a", :raise => true) # => raise InvalidNumberError
def number_with_delimiter(number, options = {})
options = options.symbolize_keys
parse_float(number, options[:raise]) or return number
options = defaults_translations(options[:locale]).merge(options)
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
# Formats a +number+ with the specified level of <tt>:precision</tt> (e.g., 112.32 has a precision
# of 2 if +:significant+ is +false+, and 5 if +:significant+ is +true+).
# You can customize the format in the +options+ hash.
#
# ==== Options
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current locale).
# * <tt>:precision</tt> - Sets the precision of the number (defaults to 3).
# * <tt>:significant</tt> - If +true+, precision will be the # of significant_digits. If +false+,
# the # of fractional digits (defaults to +false+).
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults
# to ".").
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to "").
# * <tt>:strip_insignificant_zeros</tt> - If +true+ removes insignificant zeros after the decimal separator
# (defaults to +false+).
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# ==== Examples
# 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(111.2345, :significant => true) # => 111
# number_with_precision(111.2345, :precision => 1, :significant => true) # => 100
# number_with_precision(13, :precision => 5, :significant => true) # => 13.000
# number_with_precision(111.234, :locale => :fr) # => 111,234
#
# number_with_precision(13, :precision => 5, :significant => true, :strip_insignificant_zeros => true)
# # => 13
#
# number_with_precision(389.32314, :precision => 4, :significant => true) # => 389.3
# number_with_precision(1111.2345, :precision => 2, :separator => ',', :delimiter => '.')
# # => 1.111,23
def number_with_precision(number, options = {})
options = options.symbolize_keys
number = (parse_float(number, options[:raise]) or return number)
defaults = format_translations('precision', options[:locale])
options = defaults.merge!(options)
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
rounded_number = rounded_number.zero? ? rounded_number.abs : rounded_number #prevent showing negative zeros
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
STORAGE_UNITS = [:byte, :kb, :mb, :gb, :tb].freeze
# Formats the bytes in +number+ into a more understandable representation
# (e.g., giving it 1500 yields 1.5 KB). This method is useful for
# reporting file sizes to users. You can customize the
# format in the +options+ hash.
#
# See <tt>number_to_human</tt> if you want to pretty-print a generic number.
#
# ==== Options
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current locale).
# * <tt>:precision</tt> - Sets the precision of the number (defaults to 3).
# * <tt>:significant</tt> - If +true+, precision will be the # of significant_digits. If +false+, the # of fractional digits (defaults to +true+)
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults to ".").
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to "").
# * <tt>:strip_insignificant_zeros</tt> - If +true+ removes insignificant zeros after the decimal separator (defaults to +true+)
# * <tt>:prefix</tt> - If +:si+ formats the number using the SI prefix (defaults to :binary)
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
# ==== Examples
# number_to_human_size(123) # => 123 Bytes
# number_to_human_size(1234) # => 1.21 KB
# number_to_human_size(12345) # => 12.1 KB
# number_to_human_size(1234567) # => 1.18 MB
# number_to_human_size(1234567890) # => 1.15 GB
# number_to_human_size(1234567890123) # => 1.12 TB
# number_to_human_size(1234567, :precision => 2) # => 1.2 MB
# number_to_human_size(483989, :precision => 2) # => 470 KB
# number_to_human_size(1234567, :precision => 2, :separator => ',') # => 1,2 MB
#
# Non-significant zeros after the fractional separator are stripped out by default (set
# <tt>:strip_insignificant_zeros</tt> to +false+ to change that):
# number_to_human_size(1234567890123, :precision => 5) # => "1.1229 TB"
# number_to_human_size(524288000, :precision => 5) # => "500 MB"
def number_to_human_size(number, options = {})
options = options.symbolize_keys
number = (parse_float(number, options[:raise]) or return number)
defaults = format_translations('human', options[:locale])
options = defaults.merge!(options)
#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
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}.freeze
# Pretty prints (formats and approximates) a number in a way it is more readable by humans
# (eg.: 1200000000 becomes "1.2 Billion"). This is useful for numbers that
# can get very large (and too hard to read).
#
# See <tt>number_to_human_size</tt> if you want to print a file size.
#
# You can also define you own unit-quantifier names if you want to use other decimal units
# (eg.: 1500 becomes "1.5 kilometers", 0.150 becomes "150 milliliters", etc). You may define
# a wide range of unit quantifiers, even fractional ones (centi, deci, mili, etc).
#
# ==== Options
# * <tt>:locale</tt> - Sets the locale to be used for formatting (defaults to current locale).
# * <tt>:precision</tt> - Sets the precision of the number (defaults to 3).
# * <tt>:significant</tt> - If +true+, precision will be the # of significant_digits. If +false+, the # of fractional digits (defaults to +true+)
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults to ".").
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to "").
# * <tt>:strip_insignificant_zeros</tt> - If +true+ removes insignificant zeros after the decimal separator (defaults to +true+)
# * <tt>:units</tt> - A Hash of unit quantifier names. Or a string containing an i18n scope where to find this hash. It might have the following keys:
# * *integers*: <tt>:unit</tt>, <tt>:ten</tt>, <tt>:hundred</tt>, <tt>:thousand</tt>, <tt>:million</tt>, <tt>:billion</tt>, <tt>:trillion</tt>, <tt>:quadrillion</tt>
# * *fractionals*: <tt>:deci</tt>, <tt>:centi</tt>, <tt>:mili</tt>, <tt>:micro</tt>, <tt>:nano</tt>, <tt>:pico</tt>, <tt>:femto</tt>
# * <tt>:format</tt> - Sets the format of the output string (defaults to "%n %u"). The field types are:
# * <tt>:raise</tt> - If true, raises +InvalidNumberError+ when the argument is invalid.
#
# %u The quantifier (ex.: 'thousand')
# %n The number
#
# ==== Examples
# number_to_human(123) # => "123"
# number_to_human(1234) # => "1.23 Thousand"
# number_to_human(12345) # => "12.3 Thousand"
# number_to_human(1234567) # => "1.23 Million"
# number_to_human(1234567890) # => "1.23 Billion"
# number_to_human(1234567890123) # => "1.23 Trillion"
# number_to_human(1234567890123456) # => "1.23 Quadrillion"
# number_to_human(1234567890123456789) # => "1230 Quadrillion"
# number_to_human(489939, :precision => 2) # => "490 Thousand"
# number_to_human(489939, :precision => 4) # => "489.9 Thousand"
# number_to_human(1234567, :precision => 4,
# :significant => false) # => "1.2346 Million"
# number_to_human(1234567, :precision => 1,
# :separator => ',',
# :significant => false) # => "1,2 Million"
#
# Unsignificant zeros after the decimal separator are stripped out by default (set
# <tt>:strip_insignificant_zeros</tt> to +false+ to change that):
# number_to_human(12345012345, :significant_digits => 6) # => "12.345 Billion"
# number_to_human(500000000, :precision => 5) # => "500 Million"
#
# ==== Custom Unit Quantifiers
#
# You can also use your own custom unit quantifiers:
# number_to_human(500000, :units => {:unit => "ml", :thousand => "lt"}) # => "500 lt"
#
# If in your I18n locale you have:
# distance:
# centi:
# one: "centimeter"
# other: "centimeters"
# unit:
# one: "meter"
# other: "meters"
# thousand:
# one: "kilometer"
# other: "kilometers"
# billion: "gazillion-distance"
#
# Then you could do:
#
# number_to_human(543934, :units => :distance) # => "544 kilometers"
# number_to_human(54393498, :units => :distance) # => "54400 kilometers"
# number_to_human(54393498000, :units => :distance) # => "54.4 gazillion-distance"
# number_to_human(343, :units => :distance, :precision => 1) # => "300 meters"
# number_to_human(1, :units => :distance) # => "1 meter"
# number_to_human(0.34, :units => :distance) # => "34 centimeters"
#
def number_to_human(number, options = {})
options = options.symbolize_keys
number = (parse_float(number, options[:raise]) or return number)
defaults = format_translations('human', options[:locale])
options = defaults.merge!(options)
#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)
inverted_du = DECIMAL_UNITS.invert
units = options.delete :units
unit_exponents = case units
when Hash
units
when String, Symbol
I18n.translate(:"#{units}", :locale => options[:locale], :raise => true)
when nil
I18n.translate(:"number.human.decimal_units.units", :locale => options[:locale], :raise => true)
else
raise ArgumentError, ":units must be a Hash or String translation scope."
end.keys.map{|e_name| inverted_du[e_name] }.sort_by{|e| -e}
number_exponent = number != 0 ? Math.log10(number.abs).floor : 0
display_exponent = unit_exponents.find{ |e| number_exponent >= e } || 0
number /= 10 ** display_exponent
unit = case units
when Hash
units[DECIMAL_UNITS[display_exponent]]
when String, Symbol
I18n.translate(:"#{units}.#{DECIMAL_UNITS[display_exponent]}", :locale => options[:locale], :count => number.to_i)
else
I18n.translate(:"number.human.decimal_units.units.#{DECIMAL_UNITS[display_exponent]}", :locale => options[:locale], :count => number.to_i)
end
decimal_format = options[:format] || I18n.translate(:'number.human.decimal_units.format', :locale => options[:locale], :default => "%n %u")
formatted_number = number_with_precision(number, options)
decimal_format.gsub(/%n/, formatted_number).gsub(/%u/, unit).strip.html_safe
end
private
def format_translations(namespace, locale)
defaults_translations(locale).merge(translations_for(namespace, locale))
end
def defaults_translations(locale)
I18n.translate(:'number.format', :locale => locale, :default => {})
end
def translations_for(namespace, locale)
I18n.translate(:"number.#{namespace}.format", :locale => locale, :default => {})
end
def parse_float(number, raise_error)
Float(number)
rescue ArgumentError, TypeError
raise InvalidNumberError, number if raise_error
end
end
end
end