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rails--rails/activesupport/lib/active_support/number_helper.rb
Vipul A M 67c2525d59 Minor Refactoring to NumberHelper#number_to_human 
* Use destructive `map` and `sort_by` to save extra object creation.
* Create `INVERTED_DECIMAL_UNITS.invert` constant instead of repeatedly doing `DECIMAL_UNITS.invert`
2013-10-14 23:52:06 +05:30

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require 'active_support/core_ext/big_decimal/conversions'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/hash/keys'
require 'active_support/i18n'
module ActiveSupport
module NumberHelper
extend self
DEFAULTS = {
# Used in number_to_delimited
# These are also the defaults for 'currency', 'percentage', 'precision', and 'human'
format: {
# Sets the separator between the units, for more precision (e.g. 1.0 / 2.0 == 0.5)
separator: ".",
# Delimits thousands (e.g. 1,000,000 is a million) (always in groups of three)
delimiter: ",",
# Number of decimals, behind the separator (the number 1 with a precision of 2 gives: 1.00)
precision: 3,
# If set to true, precision will mean the number of significant digits instead
# of the number of decimal digits (1234 with precision 2 becomes 1200, 1.23543 becomes 1.2)
significant: false,
# If set, the zeros after the decimal separator will always be stripped (eg.: 1.200 will be 1.2)
strip_insignificant_zeros: false
},
# Used in number_to_currency
currency: {
format: {
format: "%u%n",
negative_format: "-%u%n",
unit: "$",
# These five are to override number.format and are optional
separator: ".",
delimiter: ",",
precision: 2,
significant: false,
strip_insignificant_zeros: false
}
},
# Used in number_to_percentage
percentage: {
format: {
delimiter: "",
format: "%n%"
}
},
# Used in number_to_rounded
precision: {
format: {
delimiter: ""
}
},
# Used in number_to_human_size and number_to_human
human: {
format: {
# These five are to override number.format and are optional
delimiter: "",
precision: 3,
significant: true,
strip_insignificant_zeros: true
},
# Used in number_to_human_size
storage_units: {
# Storage units output formatting.
# %u is the storage unit, %n is the number (default: 2 MB)
format: "%n %u",
units: {
byte: "Bytes",
kb: "KB",
mb: "MB",
gb: "GB",
tb: "TB"
}
},
# Used in number_to_human
decimal_units: {
format: "%n %u",
# Decimal units output formatting
# By default we will only quantify some of the exponents
# but the commented ones might be defined or overridden
# by the user.
units: {
# femto: Quadrillionth
# pico: Trillionth
# nano: Billionth
# micro: Millionth
# mili: Thousandth
# centi: Hundredth
# deci: Tenth
unit: "",
# ten:
# one: Ten
# other: Tens
# hundred: Hundred
thousand: "Thousand",
million: "Million",
billion: "Billion",
trillion: "Trillion",
quadrillion: "Quadrillion"
}
}
}
}
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 }
INVERTED_DECIMAL_UNITS = DECIMAL_UNITS.invert
STORAGE_UNITS = [:byte, :kb, :mb, :gb, :tb]
# 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('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(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
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?
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.
#
# ==== 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(-1234567890.50, negative_format: '(%u%n)')
# # => ($1,234,567,890.50)
# 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 = {})
return unless number
options = options.symbolize_keys
currency = i18n_format_options(options[:locale], :currency)
currency[:negative_format] ||= "-" + currency[:format] if currency[:format]
defaults = default_format_options(:currency).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.phase != 0
format = options.delete(:negative_format)
number = number.respond_to?("abs") ? number.abs : number.sub(/^-/, '')
end
format.gsub('%n', self.number_to_rounded(number, options)).gsub('%u', unit)
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%").
#
# ==== 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 %
def number_to_percentage(number, options = {})
return unless number
options = options.symbolize_keys
defaults = format_options(options[:locale], :percentage)
options = defaults.merge!(options)
format = options[:format] || "%n%"
format.gsub('%n', self.number_to_rounded(number, options))
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 ".").
#
# ==== Examples
#
# number_to_delimited(12345678) # => 12,345,678
# number_to_delimited('123456') # => 123,456
# number_to_delimited(12345678.05) # => 12,345,678.05
# number_to_delimited(12345678, delimiter: '.') # => 12.345.678
# number_to_delimited(12345678, delimiter: ',') # => 12,345,678
# number_to_delimited(12345678.05, separator: ' ') # => 12,345,678 05
# number_to_delimited(12345678.05, locale: :fr) # => 12 345 678,05
# number_to_delimited('112a') # => 112a
# number_to_delimited(98765432.98, delimiter: ' ', separator: ',')
# # => 98 765 432,98
def number_to_delimited(number, options = {})
options = options.symbolize_keys
return number unless valid_float?(number)
options = format_options(options[:locale]).merge!(options)
parts = number.to_s.split('.')
parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")
parts.join(options[:separator])
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+).
#
# ==== Examples
#
# number_to_rounded(111.2345) # => 111.235
# number_to_rounded(111.2345, precision: 2) # => 111.23
# number_to_rounded(13, precision: 5) # => 13.00000
# number_to_rounded(389.32314, precision: 0) # => 389
# number_to_rounded(111.2345, significant: true) # => 111
# number_to_rounded(111.2345, precision: 1, significant: true) # => 100
# number_to_rounded(13, precision: 5, significant: true) # => 13.000
# number_to_rounded(111.234, locale: :fr) # => 111,234
#
# number_to_rounded(13, precision: 5, significant: true, strip_insignificant_zeros: true)
# # => 13
#
# number_to_rounded(389.32314, precision: 4, significant: true) # => 389.3
# number_to_rounded(1111.2345, precision: 2, separator: ',', delimiter: '.')
# # => 1.111,23
def number_to_rounded(number, options = {})
return number unless valid_float?(number)
number = Float(number)
options = options.symbolize_keys
defaults = format_options(options[:locale], :precision)
options = defaults.merge!(options)
precision = options.delete :precision
significant = options.delete :significant
strip_insignificant_zeros = options.delete :strip_insignificant_zeros
if significant && precision > 0
if number == 0
digits, rounded_number = 1, 0
else
digits = (Math.log10(number.abs) + 1).floor
multiplier = 10 ** (digits - precision)
rounded_number = (BigDecimal.new(number.to_s) / BigDecimal.new(multiplier.to_f.to_s)).round.to_f * multiplier
digits = (Math.log10(rounded_number.abs) + 1).floor # After rounding, the number of digits may have changed
end
precision -= digits
precision = 0 if precision < 0 # don't let it be negative
else
rounded_number = BigDecimal.new(number.to_s).round(precision).to_f
rounded_number = rounded_number.abs if rounded_number.zero? # prevent showing negative zeros
end
formatted_number = self.number_to_delimited("%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/, '')
else
formatted_number
end
end
# 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)
#
# ==== 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
return number unless valid_float?(number)
number = Float(number)
defaults = format_options(options[:locale], :human)
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 = translate_number_value_with_default('human.storage_units.format', :locale => options[:locale], :raise => true)
base = options[:prefix] == :si ? 1000 : 1024
if number.to_i < base
unit = translate_number_value_with_default('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(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 = translate_number_value_with_default("human.storage_units.units.#{unit_key}", :locale => options[:locale], :count => number, :raise => true)
formatted_number = self.number_to_rounded(number, options)
storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit)
end
end
# 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 your 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:
# * %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"
#
# Non-significant 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
return number unless valid_float?(number)
number = Float(number)
defaults = format_options(options[:locale], :human)
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)
units = options.delete :units
unit_exponents = case units
when Hash
units
when String, Symbol
I18n.translate(:"#{units}", :locale => options[:locale], :raise => true)
when nil
translate_number_value_with_default("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_DECIMAL_UNITS[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
translate_number_value_with_default("human.decimal_units.units.#{DECIMAL_UNITS[display_exponent]}", :locale => options[:locale], :count => number.to_i)
end
decimal_format = options[:format] || translate_number_value_with_default('human.decimal_units.format', :locale => options[:locale])
formatted_number = self.number_to_rounded(number, options)
decimal_format.gsub(/%n/, formatted_number).gsub(/%u/, unit).strip
end
def self.private_module_and_instance_method(method_name) #:nodoc:
private method_name
private_class_method method_name
end
private_class_method :private_module_and_instance_method
def format_options(locale, namespace = nil) #:nodoc:
default_format_options(namespace).merge!(i18n_format_options(locale, namespace))
end
private_module_and_instance_method :format_options
def default_format_options(namespace = nil) #:nodoc:
options = DEFAULTS[:format].dup
options.merge!(DEFAULTS[namespace][:format]) if namespace
options
end
private_module_and_instance_method :default_format_options
def i18n_format_options(locale, namespace = nil) #:nodoc:
options = I18n.translate(:'number.format', locale: locale, default: {}).dup
if namespace
options.merge!(I18n.translate(:"number.#{namespace}.format", locale: locale, default: {}))
end
options
end
private_module_and_instance_method :i18n_format_options
def translate_number_value_with_default(key, i18n_options = {}) #:nodoc:
default = key.split('.').reduce(DEFAULTS) { |defaults, k| defaults[k.to_sym] }
I18n.translate(key, { default: default, scope: :number }.merge!(i18n_options))
end
private_module_and_instance_method :translate_number_value_with_default
def valid_float?(number) #:nodoc:
Float(number)
rescue ArgumentError, TypeError
false
end
private_module_and_instance_method :valid_float?
end
end
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