iso8601_duration.rb
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	require 'application_helper'

	module Iso8601Duration
	extend self

	TIME_PERIODS = ApplicationHelper::TIME_PERIODS.invert
	def to_seconds(duration)
	total = 0

	atomize(duration).each { \|k, val\|
	next unless secs = TIME_PERIODS[k.to_s]
	total += secs.to_i * val
	}

	total
	end

	def atomize(input)
	duration = parse(input)

	components = parse_tokens(duration)
	components.delete(:time) # clean time capture

	components
	end

	def parse_tokens(tokens)
	components = tokens.names.zip(tokens.captures).map! do \|k, v\|
	value = v.nil? ? v : v.tr(',', '.')
	[k.to_sym, value.to_i]
	end

	Hash[components]
	end

	def parse(input)
	input.match(/^
	(?<sign>\+\|-)?
	P(?:
	(?:
	(?:(?<year>\d+(?:[,.]\d+)?)Y)?
	(?:(?<month>\d+(?:[.,]\d+)?)M)?
	(?:(?<day>\d+(?:[.,]\d+)?)D)?
	(?<time>T
	(?:(?<hour>\d+(?:[.,]\d+)?)H)?
	(?:(?<minute>\d+(?:[.,]\d+)?)M)?
	(?:(?<second>\d+(?:[.,]\d+)?)S)?
	)?
	) \|
	(?<week>\d+(?:[.,]\d+)?W)
	) # Duration
	$/x)
	end
	end