range.rb
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	#
	# range.rb
	#

	# TODO(Krzysztof Wilczynski): We probably need to approach numeric values differently ...

	module Puppet::Parser::Functions
	newfunction(:range, :type => :rvalue, :doc => <<-EOS
	When given range in the form of (start, stop) it will extrapolate a range as
	an array.

	Examples:

	range("0", "9")

	Will return: [0,1,2,3,4,5,6,7,8,9]

	range("00", "09")

	Will return: [0,1,2,3,4,5,6,7,8,9] (Zero padded strings are converted to
	integers automatically)

	range("a", "c")

	Will return: ["a","b","c"]

	range("host01", "host10")

	Will return: ["host01", "host02", ..., "host09", "host10"]

	Passing a third argument will cause the generated range to step by that
	interval, e.g.

	range("0", "9", "2")

	Will return: [0,2,4,6,8]
	EOS
	) do \|arguments\|

	# We support more than one argument but at least one is mandatory ...
	raise(Puppet::ParseError, "range(): Wrong number of " +
	"arguments given (#{arguments.size} for 1)") if arguments.size < 1

	if arguments.size > 1
	start = arguments[0]
	stop = arguments[1]
	step = arguments[2].nil? ? 1 : arguments[2].to_i.abs

	type = '..' # We select simplest type for Range available in Ruby ...

	elsif arguments.size > 0
	value = arguments[0]

	if m = value.match(/^(\w+)(\.\.\.?\|\-)(\w+)$/)
	start = m[1]
	stop = m[3]

	type = m[2]

	elsif value.match(/^.+$/)
	raise(Puppet::ParseError, 'range(): Unable to compute range ' +
	'from the value given')
	else
	raise(Puppet::ParseError, 'range(): Unknown format of range given')
	end
	end

	# Check whether we have integer value if so then make it so ...
	if start.to_s.match(/^\d+$/)
	start = start.to_i
	stop = stop.to_i
	else
	start = start.to_s
	stop = stop.to_s
	end

	range = case type
	when /^(\.\.\|\-)$/ then (start .. stop)
	when /^(\.\.\.)$/ then (start ... stop) # Exclusive of last element ...
	end

	result = range.step(step).collect { \|i\| i } # Get them all ... Pokemon ...

	return result
	end
	end

	# vim: set ts=2 sw=2 et :

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