Class: Text::Format::Roman

Provides a numbering object that will produce numbers. Accepts three parameters for numbering that will control how the numbers are presented when given as #[](index).

`:offset`:	The number to add to the index in order to produce the proper index. This is because tag_text indexes from 0, not 1. This defaults to 1. Any value less than 1 will be set to 1 (because Romans did not know about zero or negative numbers).
`:lower`:	Renders the Roman numerals in lowercase if `true`. Defaults to `false`.
`:postfix`:	The value that will be appended to the number presented by #[]. Defaults to `nil`.
`:prefix`:	The value that will be prepended to the number presented by #[]. Defaults to `nil`.

  r1 = Text::Format::Roman.new(:postfix => ".")
  puts r1[0]  # => "I."
  puts r1[8]  # => "IX.

  r2 = Text::Format::Roman.new(:prefix => "M.")
  puts r2[0]  # => "M.I"
  puts r2[8]  # => "M.IX"

  r3 = Text::Format::Roman.new(:offset => 3)
  puts r3[0]  # => "III"
  puts r3[9]  # => "XII"

  r4 = Text::Format::Roman.new(:offset => 0)
  puts r4[0]  # => "I"
  puts r4[8]  # => "IX"

  r5 = Text::Format::Roman.new(:lower => true)
  puts r5[0]  # => "i"
  puts r5[8]  # => "ix"

Methods

[] new

Public Class methods

new(options = {})

[Source]

     # File lib/text/format/roman.rb, line 97
 97:   def initialize(options = {})
 98:     @offset   = options[:offset].to_i || 1
 99:     @lower    = options[:lower]       || false
100:     @postfix  = options[:postfix]     || nil
101:     @prefix   = options[:prefix]      || nil
102: 
103:     @offset   = 1 if @offset < 1
104:   end

Public Instance methods

[](index)

[Source]

    # File lib/text/format/roman.rb, line 37
37:   def [](index)
38:     roman = ""
39:     index += @offset
40: 
41:       # Do 1,000s
42:     roman << "M" * (index / 1000)
43:     index %= 1000
44: 
45:       # Do 900s
46:     roman << "CM" * (index / 900)
47:     index %= 900
48: 
49:       # Do 500s
50:     roman << "D" * (index / 500)
51:     index %= 500
52: 
53:       # Do 400s
54:     roman << "CD" * (index / 400)
55:     index %= 400
56: 
57:       # Do 100s
58:     roman << "C" * (index / 100)
59:     index %= 100
60: 
61:       # Do 90s
62:     roman << "XC" * (index / 90)
63:     index %= 90
64: 
65:       # Do 50s
66:     roman << "L" * (index / 50)
67:     index %= 50
68: 
69:       # Do 40s
70:     roman << "XL" * (index / 40)
71:     index %= 40
72: 
73:       # Do 10s
74:     roman << "X" * (index / 10)
75:     index %= 10
76: 
77:       # Do 9s
78:     roman << "IX" * (index / 9)
79:     index %= 9
80: 
81:       # Do 5s
82:     roman << "V" * (index / 5)
83:     index %= 5
84: 
85:       # Do 4s
86:     roman << "IV" * (index / 4)
87:     index %= 4
88: 
89:       # Do 1s
90:     roman << "I" * index
91: 
92:     roman.downcase! if @lower
93: 
94:     "#{@prefix}#{roman}#{@postfix}"
95:   end