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.
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: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.
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n1 = Text::Format::Number.new(:postfix => ".")
puts n1[0] # => "1."
puts n1[1] # => "2.
n2 = Text::Format::Number.new(:prefix => "2.")
puts n2[0] # => "2.1"
puts n2[1] # => "2.2"
n3 = Text::Format::Number.new(:offset => 3)
puts n3[0] # => "3"
puts n3[1] # => "4"