1 | #
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2 | # prefix.rb
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3 | #
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4 |
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5 | module Puppet::Parser::Functions
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6 | newfunction(:prefix, :type => :rvalue, :doc => <<-EOS
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7 | This function applies a prefix to all elements in an array or a hash.
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8 |
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9 | *Examples:*
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10 |
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11 | prefix(['a','b','c'], 'p')
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12 |
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13 | Will return: ['pa','pb','pc']
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14 | EOS
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15 | ) do |arguments|
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16 |
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17 | # Technically we support two arguments but only first is mandatory ...
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18 | raise(Puppet::ParseError, "prefix(): Wrong number of arguments " +
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19 | "given (#{arguments.size} for 1)") if arguments.size < 1
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20 |
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21 | enumerable = arguments[0]
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22 |
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23 | unless enumerable.is_a?(Array) or enumerable.is_a?(Hash)
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24 | raise Puppet::ParseError, "prefix(): expected first argument to be an Array or a Hash, got #{enumerable.inspect}"
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25 | end
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26 |
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27 | prefix = arguments[1] if arguments[1]
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28 |
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29 | if prefix
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30 | unless prefix.is_a?(String)
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31 | raise Puppet::ParseError, "prefix(): expected second argument to be a String, got #{prefix.inspect}"
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32 | end
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33 | end
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34 |
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35 | if enumerable.is_a?(Array)
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36 | # Turn everything into string same as join would do ...
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37 | result = enumerable.collect do |i|
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38 | i = i.to_s
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39 | prefix ? prefix + i : i
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40 | end
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41 | else
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42 | result = Hash[enumerable.map do |k,v|
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43 | k = k.to_s
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44 | [ prefix ? prefix + k : k, v ]
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45 | end]
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46 | end
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47 |
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48 | return result
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49 | end
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50 | end
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51 |
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52 | # vim: set ts=2 sw=2 et :
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