88 lines
2.0 KiB
Ruby
88 lines
2.0 KiB
Ruby
#
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# range.rb
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#
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# TODO(Krzysztof Wilczynski): We probably need to approach numeric values differently ...
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module Puppet::Parser::Functions
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newfunction(:range, :type => :rvalue, :doc => <<-EOS
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When given range in the form of (start, stop) it will extrapolate a range as
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an array.
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*Examples:*
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range("0", "9")
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Will return: [0,1,2,3,4,5,6,7,8,9]
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range("00", "09")
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Will return: [0,1,2,3,4,5,6,7,8,9] (Zero padded strings are converted to
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integers automatically)
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range("a", "c")
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Will return: ["a","b","c"]
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range("host01", "host10")
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Will return: ["host01", "host02", ..., "host09", "host10"]
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Passing a third argument will cause the generated range to step by that
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interval, e.g.
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range("0", "9", "2")
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Will return: [0,2,4,6,8]
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EOS
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) do |arguments|
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raise(Puppet::ParseError, 'range(): Wrong number of ' +
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'arguments given (0 for 1)') if arguments.size == 0
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if arguments.size > 1
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start = arguments[0]
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stop = arguments[1]
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step = arguments[2].nil? ? 1 : arguments[2].to_i.abs
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type = '..' # Use the simplest type of Range available in Ruby
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else # arguments.size == 1
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value = arguments[0]
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if m = value.match(/^(\w+)(\.\.\.?|\-)(\w+)$/)
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start = m[1]
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stop = m[3]
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type = m[2]
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step = 1
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elsif value.match(/^.+$/)
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raise(Puppet::ParseError, "range(): Unable to compute range " +
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"from the value: #{value}")
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else
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raise(Puppet::ParseError, "range(): Unknown range format: #{value}")
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end
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end
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# If we were given an integer, ensure we work with one
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if start.to_s.match(/^\d+$/)
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start = start.to_i
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stop = stop.to_i
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else
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start = start.to_s
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stop = stop.to_s
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end
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range = case type
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when /^(\.\.|\-)$/ then (start .. stop)
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when '...' then (start ... stop) # Exclusive of last element
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end
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result = range.step(step).to_a
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return result
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end
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end
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# vim: set ts=2 sw=2 et :
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