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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|
raise(Puppet::ParseError, 'range(): Wrong number of ' +
'arguments given (0 for 1)') if arguments.size == 0
if arguments.size > 1
start = arguments[0]
stop = arguments[1]
step = arguments[2].nil? ? 1 : arguments[2].to_i.abs
type = '..' # Use the simplest type of Range available in Ruby
else # arguments.size == 1
value = arguments[0]
if m = value.match(/^(\w+)(\.\.\.?|\-)(\w+)$/)
start = m[1]
stop = m[3]
type = m[2]
step = 1
elsif value.match(/^.+$/)
raise(Puppet::ParseError, "range(): Unable to compute range " +
"from the value: #{value}")
else
raise(Puppet::ParseError, "range(): Unknown range format: #{value}")
end
end
# If we were given an integer, ensure we work with one
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).to_a
return result
end
end
# vim: set ts=2 sw=2 et :
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