65 lines
1.7 KiB
Ruby
65 lines
1.7 KiB
Ruby
#
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# collect_indices.rb
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#
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module Puppet::Parser::Functions
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newfunction(:collect_indices, :type => :rvalue, :doc => <<-EOS
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EOS
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) do |arguments|
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raise(Puppet::ParseError, "Wrong number of arguments " +
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"given (#{arguments.size} for 2)") if arguments.size < 2
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array = arguments.shift
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array_size = array.size
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if not array.is_a?(Array)
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raise(Puppet::ParseError, 'Requires an array to work with')
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end
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indices = *arguments # Get them all ... Pokemon ...
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if not indices or indices.empty?
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raise(Puppet::ParseError, 'You must provide indices to collect')
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end
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indices_list = []
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indices.each do |i|
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if m = i.match(/^(\d+)\-(\d+)$/)
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start = m[1].to_i
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stop = m[2].to_i
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if start > stop
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raise(Puppet::ParseError, 'Stop index in given indices range ' +
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'is smaller than the start index')
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elsif stop > array_size - 1 # First element is at index 0 is it not?
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raise(Puppet::ParseError, 'Stop index in given indices range ' +
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'exceeds array size')
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end
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(start .. stop).each { |i| indices_list << i.to_i }
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else
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# Only positive numbers allowed ...
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if not i.match(/^\d+$/)
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raise(Puppet::ParseError, 'Unknown format of given index')
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end
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# In Puppet numbers are often string-encoded ...
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i = i.to_i
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if i > array_size - 1 # Same story. First element is at index 0 ...
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raise(Puppet::ParseError, 'Given index exceeds array size')
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end
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indices_list << i
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end
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end
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array = indices_list.collect { |i| array[i] }.compact
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return array
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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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