88 lines
2.1 KiB
Ruby
88 lines
2.1 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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# We support more than one argument but at least one is mandatory ...
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raise(Puppet::ParseError, "range(): Wrong number of " +
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"arguments given (#{arguments.size} for 1)") if arguments.size < 1
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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 = '..' # We select simplest type for Range available in Ruby ...
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elsif arguments.size > 0
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value = arguments[0]
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if m = value.match(/^(\w+)(\.\.\.?|\-)(\w+)$/)
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start = m[1]
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stop = m[3]
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type = m[2]
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elsif value.match(/^.+$/)
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raise(Puppet::ParseError, 'range(): Unable to compute range ' +
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'from the value given')
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else
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raise(Puppet::ParseError, 'range(): Unknown format of range given')
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end
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end
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# Check whether we have integer value if so then make it so ...
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if start.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).collect { |i| i } # Get them all ... Pokemon ...
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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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