Module: SitemapGenerator::Helpers::NumberHelper

Included in:
Builder::SitemapFile
Defined in:
lib/sitemap_generator/helpers/number_helper.rb

Overview

Provides methods for converting numbers into formatted strings. Methods are provided for precision, positional notation and 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.

Defined Under Namespace

Classes: InvalidNumberError

Constant Summary collapse

STORAGE_UNITS = 
[:byte, :kb, :mb, :gb, :tb].freeze
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

Instance Method Summary collapse

Instance Method Details

#number_to_human_size(number, options = {}) ⇒ Object

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 number_to_human if you want to pretty-print a generic number.

Options

  • :locale - Sets the locale to be used for formatting (defaults to current locale).

  • :precision - Sets the precision of the number (defaults to 3).

  • :significant - If true, precision will be the # of significant_digits. If false, the # of fractional digits (defaults to true)

  • :separator - Sets the separator between the fractional and integer digits (defaults to “.”).

  • :delimiter - Sets the thousands delimiter (defaults to “”).

  • :strip_insignificant_zeros - If true removes insignificant 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

Non-significant zeros after the fractional separator are stripped out by default (set :strip_insignificant_zeros to false to change that):

number_to_human_size(1234567890123, :precision => 5)        # => "1.1229 TB"
number_to_human_size(524288000, :precision=>5)              # => "500 MB"



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
 
# File 'lib/sitemap_generator/helpers/number_helper.rb', line 180

def number_to_human_size(number, options = {})
  SitemapGenerator::Utilities.symbolize_keys!(options)

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

  defaults = {
    :separator => ".",
    :delimiter => ",",
    :precision => 3,
    :significant => false,
    :strip_insignificant_zeros => false
  }
  human = {
    :delimiter => "",
    :precision => 3,
    :significant => true,
    :strip_insignificant_zeros => true
  }
  defaults = defaults.merge(human)
  options = SitemapGenerator::Utilities.reverse_merge(options, 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 = "%n %u"

  if number.to_i < 1024
    unit = number.to_i > 1 || number.to_i == 0 ? 'Bytes' : 'Byte'
    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]
    units = {
      :byte => "Bytes",
      :kb => "KB",
      :mb => "MB",
      :gb => "GB",
      :tb => "TB"
    }
    unit = units[unit_key]
    formatted_number = number_with_precision(number, options)
    storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit)
  end
end

#number_with_delimiter(number, options = {}) ⇒ Object

Formats a number with grouped thousands using delimiter (e.g., 12,324). You can customize the format in the options hash.

Options

  • :locale - Sets the locale to be used for formatting (defaults to current locale).

  • :delimiter - Sets the thousands delimiter (defaults to “,”).

  • :separator - 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(12345678.05, :locale => :fr)     # => 12 345 678,05
number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
# => 98 765 432,98



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
 
# File 'lib/sitemap_generator/helpers/number_helper.rb', line 41

def number_with_delimiter(number, options = {})
  SitemapGenerator::Utilities.symbolize_keys!(options)

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

  defaults = {
    :separator => ".",
    :delimiter => ",",
    :precision => 3,
    :significant => false,
    :strip_insignificant_zeros => false
  }
  options = SitemapGenerator::Utilities.reverse_merge(options, defaults)

  parts = number.to_s.to_str.split('.')
  parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")
  parts.join(options[:separator])
end

#number_with_precision(number, options = {}) ⇒ Object

Formats a number with the specified level of :precision (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

  • :locale - Sets the locale to be used for formatting (defaults to current locale).

  • :precision - Sets the precision of the number (defaults to 3).

  • :significant - If true, precision will be the # of significant_digits. If false, the # of fractional digits (defaults to false)

  • :separator - Sets the separator between the fractional and integer digits (defaults to “.”).

  • :delimiter - Sets the thousands delimiter (defaults to “”).

  • :strip_insignificant_zeros - 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



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
 
# File 'lib/sitemap_generator/helpers/number_helper.rb', line 94

def number_with_precision(number, options = {})
  SitemapGenerator::Utilities.symbolize_keys!(options)

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

  defaults = {
    :separator => ".",
    :delimiter => ",",
    :precision => 3,
    :significant => false,
    :strip_insignificant_zeros => false
  }
  precision_defaults = {
    :delimiter => ""
  }
  defaults = defaults.merge(precision_defaults)

  options = SitemapGenerator::Utilities.reverse_merge(options, 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 = (SitemapGenerator::BigDecimal.new(number.to_s) / SitemapGenerator::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 = precision - digits
    precision = precision > 0 ? precision : 0  #don't let it be negative
  else
    rounded_number = SitemapGenerator::Utilities.round(SitemapGenerator::BigDecimal.new(number.to_s), 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/, '')
  else
    formatted_number
  end

end