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1 #
2 # intersection.rb
3 #
4
5 module Puppet::Parser::Functions
6   newfunction(:intersection, :type => :rvalue, :doc => <<-EOS
7 This function returns an array an intersection of two.
8
9 *Examples:*
10
11     intersection(["a","b","c"],["b","c","d"])
12
13 Would return: ["b","c"]
14     EOS
15   ) do |arguments|
16
17     # Two arguments are required
18     raise(Puppet::ParseError, "intersection(): Wrong number of arguments " +
19       "given (#{arguments.size} for 2)") if arguments.size != 2
20
21     first = arguments[0]
22     second = arguments[1]
23
24     unless first.is_a?(Array) && second.is_a?(Array)
25       raise(Puppet::ParseError, 'intersection(): Requires 2 arrays')
26     end
27
28     result = first & second
29
30     return result
31   end
32 end
33
34 # vim: set ts=2 sw=2 et :