parse

# File lib/rss/itunes.rb, line 274
        def parse(duration, do_validate=true)
          if do_validate and /\A(?:
                                  \d?\d:[0-5]\d:[0-5]\d|
                                  [0-5]?\d:[0-5]\d
                                )\z/ !~ duration
            raise ArgumentError,
                    "must be one of HH:MM:SS, H:MM:SS, MM::SS, M:SS: " +
                    duration.inspect
          end

          components = duration.split(':')
          components[3..-1] = nil if components.size > 3

          components.unshift("00") until components.size == 3

          components.collect do |component|
            component.to_i
          end
        end