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# 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).
#
# <tt>:offset</tt>:: 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).
# <tt>:lower</tt>:: Renders the Roman numerals in lowercase if +true+.
# Defaults to +false+.
# <tt>:postfix</tt>:: The value that will be appended to the number
# presented by #[]. Defaults to +nil+.
# <tt>:prefix</tt>:: 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"
class Text::Format::Roman
def [](index)
roman = ""
index += @offset
# Do 1,000s
roman << "M" * (index / 1000)
index %= 1000
# Do 900s
roman << "CM" * (index / 900)
index %= 900
# Do 500s
roman << "D" * (index / 500)
index %= 500
# Do 400s
roman << "CD" * (index / 400)
index %= 400
# Do 100s
roman << "C" * (index / 100)
index %= 100
# Do 90s
roman << "XC" * (index / 90)
index %= 90
# Do 50s
roman << "L" * (index / 50)
index %= 50
# Do 40s
roman << "XL" * (index / 40)
index %= 40
# Do 10s
roman << "X" * (index / 10)
index %= 10
# Do 9s
roman << "IX" * (index / 9)
index %= 9
# Do 5s
roman << "V" * (index / 5)
index %= 5
# Do 4s
roman << "IV" * (index / 4)
index %= 4
# Do 1s
roman << "I" * index
roman.downcase! if @lower
"#{@prefix}#{roman}#{@postfix}"
end
def initialize(options = {})
@offset = options[:offset].to_i || 1
@lower = options[:lower] || false
@postfix = options[:postfix] || nil
@prefix = options[:prefix] || nil
@offset = 1 if @offset < 1
end
end
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