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added intersect function #31

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added intersect function #31

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37 changes: 37 additions & 0 deletions lib/puppet/parser/functions/intersect.rb
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
#
# intersect.rb
#

module Puppet::Parser::Functions
newfunction(:intersect, :type => :rvalue, :doc => <<-EOS
This function Intersects two arrays.

*Examles:*

intersect(['a','b','c'], ['p','a','b])

Will return: ['a','b']
EOS
) do |arguments|

raise(Puppet::ParseError, "intersect(): Wrong number of arguments " +
"given (#{arguments.size} for 2)") if arguments.size < 2

array1 = arguments[0]

unless array1.is_a?(Array)
raise(Puppet::ParseError, 'intersect(): Requires array to work with')
end

array2 = arguments[1] if arguments[1]

unless array2.is_a?(Array)
raise(Puppet::ParseError, 'intersect(): Requires array to work with')
end

# Return the set intersection of the two arrays

return array1 & array2
end
end