aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_view/helpers/number_helper.rb
blob: c642716b180611162f41059f4c2ff881e51977ea (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
# encoding: utf-8

require 'active_support/core_ext/big_decimal/conversions'
require 'active_support/core_ext/float/rounding'
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.
      #
      # ==== 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 unless number

        begin
          Float(number)
        rescue ArgumentError, TypeError
          raise InvalidNumberError, number
        end if options[:raise]

        number       = number.to_s.strip
        options      = options.symbolize_keys
        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.starts_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.join)
      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(-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.symbolize_keys!

        defaults  = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
        currency  = I18n.translate(:'number.currency.format', :locale => options[:locale], :default => {})

        defaults  = DEFAULT_CURRENCY_VALUES.merge(defaults).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+)
      #
      # ==== 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%
      #  number_to_percentage(1000, :locale => :fr)                       # => 1 000,000%
      def number_to_percentage(number, options = {})
        return unless number

        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)

        begin
          "#{number_with_precision(number, options.merge(:raise => true))}%".html_safe
        rescue InvalidNumberError => e
          if options[:raise]
            raise
          else
            e.number.to_s.html_safe? ? "#{e.number}%".html_safe : "#{e.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 ".").
      #
      # ==== 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(12345678.05, :separator => " ")  # => 12,345,678 05
      #  number_with_delimiter(12345678.05, :locale => :fr)     # => 12 345 678,05
      #  number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
      #  # => 98 765 432,98
      def number_with_delimiter(number, options = {})
        options.symbolize_keys!

        begin
          Float(number)
        rescue ArgumentError, TypeError
          if options[:raise]
            raise InvalidNumberError, number
          else
            return number
          end
        end

        defaults = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
        options = options.reverse_merge(defaults)

        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+)
      #
      # ==== 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.symbolize_keys!

        number = begin
          Float(number)
        rescue ArgumentError, TypeError
          if options[:raise]
            raise InvalidNumberError, number
          else
            return number
          end
        end

        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)

        options = options.reverse_merge(defaults)  # Allow the user to unset default values: Eg.: :significant => false
        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
        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)
      # ==== 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.symbolize_keys!

        number = begin
          Float(number)
        rescue ArgumentError, TypeError
          if options[:raise]
            raise InvalidNumberError, number
          else
            return number
          end
        end

        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_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:
      #
      #     %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.symbolize_keys!

        number = begin
          Float(number)
        rescue ArgumentError, TypeError
          if options[:raise]
            raise InvalidNumberError, number
          else
            return number
          end
        end

        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_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

    end
  end
end