module ActionView
module Helpers #:nodoc:
# Provides methods for converting numbers into formatted strings.
# Methods are provided for phone numbers, currency, percentage,
# precision, positional notation, and file size.
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(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 = {})
number = number.to_s.strip unless number.nil?
options = options.stringify_keys
area_code = options["area_code"] || nil
delimiter = options["delimiter"] || "-"
extension = options["extension"].to_s.strip || nil
country_code = options["country_code"] || nil
begin
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}$)/,"(\\1) \\2#{delimiter}\\3")
else
number.gsub!(/([0-9]{1,3})([0-9]{3})([0-9]{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
end
str << " x #{extension}" unless extension.blank?
str
rescue
number
end
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 ",").
#
# ==== 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) # => $1,234,567,890.506
#
# number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "")
# # => £1234567890,50
def number_to_currency(number, options = {})
options = options.stringify_keys
precision = options["precision"] || 2
unit = options["unit"] || "$"
separator = precision > 0 ? options["separator"] || "." : ""
delimiter = options["delimiter"] || ","
begin
parts = number_with_precision(number, precision).split('.')
unit + number_with_delimiter(parts[0], delimiter) + separator + parts[1].to_s
rescue
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 level of precision (defaults to 3).
# * <tt>:separator</tt> - Sets the separator between the units (defaults to ".").
#
# ==== Examples
# number_to_percentage(100) # => 100.000%
# number_to_percentage(100, :precision => 0) # => 100%
#
# number_to_percentage(302.24398923423, :precision => 5)
# # => 302.24399%
def number_to_percentage(number, options = {})
options = options.stringify_keys
precision = options["precision"] || 3
separator = options["separator"] || "."
begin
number = number_with_precision(number, precision)
parts = number.split('.')
if parts.at(1).nil?
parts[0] + "%"
else
parts[0] + separator + parts[1].to_s + "%"
end
rescue
number
end
end
# Formats a +number+ with grouped thousands using +delimiter+ (e.g., 12,324). You
# can customize the format using optional <em>delimiter</em> and <em>separator</em> parameters.
#
# ==== Options
# * <tt>delimiter</tt> - Sets the thousands delimiter (defaults to ",").
# * <tt>separator</tt> - Sets the separator between the units (defaults to ".").
#
# ==== Examples
# number_with_delimiter(12345678) # => 12,345,678
# number_with_delimiter(12345678.05) # => 12,345,678.05
# number_with_delimiter(12345678, ".") # => 12.345.678
#
# number_with_delimiter(98765432.98, " ", ",")
# # => 98 765 432,98
def number_with_delimiter(number, delimiter=",", 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 +precision+ (e.g., 112.32 has a precision of 2). The default
# level of precision is 3.
#
# ==== Examples
# number_with_precision(111.2345) # => 111.235
# number_with_precision(111.2345, 2) # => 111.24
# number_with_precision(13, 5) # => 13.00000
# number_with_precision(389.32314, 0) # => 389
def number_with_precision(number, precision=3)
"%01.#{precision}f" % number
rescue
number
end
# 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 change the default
# precision of 1 using the precision parameter +precision+.
#
# ==== Examples
# 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, 2) # => 1.18 MB
# number_to_human_size(483989, 0) # => 4 MB
def number_to_human_size(size, precision=1)
size = Kernel.Float(size)
case
when size.to_i == 1; "1 Byte"
when size < 1.kilobyte; "%d Bytes" % size
when size < 1.megabyte; "%.#{precision}f KB" % (size / 1.0.kilobyte)
when size < 1.gigabyte; "%.#{precision}f MB" % (size / 1.0.megabyte)
when size < 1.terabyte; "%.#{precision}f GB" % (size / 1.0.gigabyte)
else "%.#{precision}f TB" % (size / 1.0.terabyte)
end.sub(/([0-9])\.?0+ /, '\1 ' )
rescue
nil
end
end
end
end
