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require 'active_support/core_ext/big_decimal/conversions'
require 'active_support/core_ext/float/rounding'
module ActionView
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
# 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.
#
# ==== Examples
# 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(1235551234, :country_code => 1, :extension => 1343, :delimiter => ".")
# => +1.123.555.1234 x 1343
def number_to_phone(number, options = {})
return nil if number.nil?
number = number.to_s.strip
options = options.symbolize_keys
area_code = options[:area_code] || nil
delimiter = options[:delimiter] || "-"
extension = options[:extension].to_s.strip || nil
country_code = options[:country_code] || nil
str = ""
str << "+#{country_code}#{delimiter}" unless country_code.blank?
str << if area_code
number.gsub!(/([0-9]{1,3})([0-9]{3})([0-9]{4}$)/,"(\\1) \\2#{delimiter}\\3")
else
number.gsub!(/([0-9]{0,3})([0-9]{3})([0-9]{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
number.starts_with?('-') ? number.slice!(1..-1) : number
end
str << " x #{extension}" unless extension.blank?
str
end
# Formats a +number+ into a currency string (e.g., $13.65). You can customize the format
# in the +options+ hash.
#
# ==== Options
# * <tt>:precision</tt> - Sets the level of precision (defaults to 2).
# * <tt>:unit</tt> - Sets the denomination of the currency (defaults to "$").
# * <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 of the output string (defaults to "%u%n"). The field types are:
#
# %u The currency unit
# %n The number
#
# ==== 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(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "")
# # => &pound;1234567890,50
# number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "", :format => "%n %u")
# # => 1234567890,50 &pound;
def number_to_currency(number, options = {})
options.symbolize_keys!
defaults = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
currency = I18n.translate(:'number.currency.format', :locale => options[:locale], :default => {})
defaults = defaults.merge(currency)
options = options.reverse_merge(defaults)
unit = options.delete(:unit)
format = options.delete(:format)
value = number_with_precision(number, options)
if value
format.gsub(/%n/, value).gsub(/%u/, unit).html_safe
else
number
end
end
# Formats a +number+ as a percentage string (e.g., 65%). You can customize the
# format in the +options+ hash.
#
# ==== Options
# * <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_unsignificant_zeros</tt> - If +true+ removes unsignificant zeros after the decimal separator (defaults to +false+)
#
# ==== Examples
# 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%
def number_to_percentage(number, options = {})
options.symbolize_keys!
defaults = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
percentage = I18n.translate(:'number.percentage.format', :locale => options[:locale], :default => {})
defaults = defaults.merge(percentage)
options = options.reverse_merge(defaults)
value = number_with_precision(number, options)
value ? value + "%" : number
end
# Formats a +number+ with grouped thousands using +delimiter+ (e.g., 12,324). You can
# customize the format in the +options+ hash.
#
# ==== Options
# * <tt>:delimiter</tt> - Sets the thousands delimiter (defaults to ",").
# * <tt>:separator</tt> - Sets the separator between the fractional and integer digits (defaults to ".").
#
# ==== Examples
# 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
#
# You can still use <tt>number_with_delimiter</tt> with the old API that accepts the
# +delimiter+ as its optional second and the +separator+ as its
# optional third parameter:
# number_with_delimiter(12345678, " ") # => 12 345 678
# number_with_delimiter(12345678.05, ".", ",") # => 12.345.678,05
def number_with_delimiter(number, *args)
options = args.extract_options!
options.symbolize_keys!
defaults = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
unless args.empty?
ActiveSupport::Deprecation.warn('number_with_delimiter takes an option hash ' +
'instead of separate delimiter and precision arguments.', caller)
options[:delimiter] ||= args[0] if args[0]
options[:separator] ||= args[1] if args[1]
end
options = options.reverse_merge(defaults)
parts = number.to_s.split('.')
if parts[0]
parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")
parts.join(options[:separator])
else
number
end
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>: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_unsignificant_zeros</tt> - If +true+ removes unsignificant zeros after the decimal separator (defaults to +false+)
#
# ==== 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(13, :precision => 5, :significant => true, strip_unsignificant_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
#
# You can still use <tt>number_with_precision</tt> with the old API that accepts the
# +precision+ as its optional second parameter:
# number_with_precision(111.2345, 2) # => 111.23
def number_with_precision(number, *args)
number = begin
Float(number)
rescue ArgumentError, TypeError
return number
end
options = args.extract_options!
options.symbolize_keys!
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)
#Backwards compatibility
unless args.empty?
ActiveSupport::Deprecation.warn('number_with_precision takes an option hash ' +
'instead of a separate precision argument.', caller)
options[:precision] ||= args[0] if args[0]
end
options = options.reverse_merge(defaults) # Allow the user to unset default values: Eg.: :significant => false
precision = options.delete :precision
significant = options.delete :significant
strip_unsignificant_zeros = options.delete :strip_unsignificant_zeros
if significant and precision > 0
digits = (Math.log10(number) + 1).floor
rounded_number = BigDecimal.new((number / 10 ** (digits - precision)).to_s).round.to_f * 10 ** (digits - precision)
precision = precision - digits
precision = precision > 0 ? precision : 0 #don't let it be negative
else
rounded_number = BigDecimal.new((number * (10 ** precision)).to_s).round.to_f / 10 ** precision
end
formatted_number = number_with_delimiter("%01.#{precision}f" % rounded_number, options)
if strip_unsignificant_zeros
escaped_separator = Regexp.escape(options[:separator])
formatted_number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '')
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>: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_unsignificant_zeros</tt> - If +true+ removes unsignificant zeros after the decimal separator (defaults to +true+)
# ==== 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
#
# Unsignificant zeros after the fractional separator are stripped out by default (set
# <tt>:strip_unsignificant_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"
#
# You can still use <tt>number_to_human_size</tt> with the old API that accepts the
# +precision+ as its optional second parameter:
# number_to_human_size(1234567, 1) # => 1 MB
# number_to_human_size(483989, 2) # => 470 KB
def number_to_human_size(number, *args)
number = begin
Float(number)
rescue ArgumentError, TypeError
return number
end
options = args.extract_options!
options.symbolize_keys!
defaults = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
human = I18n.translate(:'number.human.format', :locale => options[:locale], :default => {})
defaults = defaults.merge(human)
unless args.empty?
ActiveSupport::Deprecation.warn('number_to_human_size takes an option hash ' +
'instead of a separate precision argument.', caller)
options[:precision] ||= args[0] if args[0]
end
options = options.reverse_merge(defaults)
#for backwards compatibility with those that didn't add strip_unsignificant_zeros to their locale files
options[:strip_unsignificant_zeros] = true if not options.key?(:strip_unsignificant_zeros)
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
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)
formatted_number = number_with_precision(number, options)
storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit)
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 mililiters", etc). You may define
# a wide range of unit quantifiers, even fractional ones (centi, deci, mili, etc).
#
# ==== Options
# * <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_unsignificant_zeros</tt> - If +true+ removes unsignificant 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:
#
# %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_unsignificant_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: "gazilion-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 gazilion-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 = {})
number = begin
Float(number)
rescue ArgumentError, TypeError
return number
end
options.symbolize_keys!
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_unsignificant_zeros to their locale files
options[:strip_unsignificant_zeros] = true if not options.key?(:strip_unsignificant_zeros)
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| DECIMAL_UNITS.invert[e_name] }.sort_by{|e| -e}
number_exponent = Math.log10(number).floor
display_exponent = unit_exponents.find{|e| number_exponent >= e }
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
end
end
end
end
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