Class Text::Format::Alpha
In: lib/text/format/alpha.rb
Parent: Object

Provides a numbering object that will produce letters. Accepts four options for numbering that will control how the letters are presented when given as #[](index). This numbering object will only provide 26 values ("a" .. "z") unless :wrap is true.

:transform:The symbol representing the method to be called on the letter. This must be a method that does not require any arguments.
:postfix:The value that will be appended to the letter presented by #[]. Defaults to nil.
:prefix:The value that will be prepended to the letter presented by #[]. Defaults to nil.
:wrap:If true, then indexes will be wrapped from "z" to "a".
  a1 = Text::Format::Alpha.new(:postfix => ".")
  puts a1[0]  # => "a."
  puts a1[1]  # => "b.
  puts a1[27] # => ""

  a2 = Text::Format::Alpha.new(:prefix => "A.")
  puts a2[0]  # => "A.a"
  puts a2[1]  # => "A.b"
  puts a2[27] # => ""

  a3 = Text::Format::Alpha.new(:transform => :upcase)
  puts a3[0]  # => "A"
  puts a3[1]  # => "B"
  puts a3[27] # => ""

  a4 = Text::Format::Alpha.new(:wrap => true)
  puts a4[0]  # => "a"
  puts a4[27] # => "b"

Methods

[]   new  

Public Class methods

Public Instance methods

[Validate]