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authorAlex Cline <acline@us.ibm.com>2013-05-13 12:09:33 -0400
committerAlex Cline <acline@us.ibm.com>2013-05-13 12:14:15 -0400
commit737aa31546e71e9febea2199582510ef88a2560c (patch)
tree280dc920205cd8d1ba9127d01eb5f37d065e8311 /lib/puppet/parser/functions/difference.rb
parent1ffd72daaaf21e71e762b6cd543043680bdb6694 (diff)
(#20684) Add array comparison functions, difference, intersection and union.
Included is code, tests and documentation for the difference, intersection and union functions for comparing arrays.
Diffstat (limited to 'lib/puppet/parser/functions/difference.rb')
-rw-r--r--lib/puppet/parser/functions/difference.rb36
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/difference.rb b/lib/puppet/parser/functions/difference.rb
new file mode 100644
index 0000000..cd258f7
--- /dev/null
+++ b/lib/puppet/parser/functions/difference.rb
@@ -0,0 +1,36 @@
+#
+# difference.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:difference, :type => :rvalue, :doc => <<-EOS
+This function returns the difference between two arrays.
+The returned array is a copy of the original array, removing any items that
+also appear in the second array.
+
+*Examples:*
+
+ difference(["a","b","c"],["b","c","d"])
+
+Would return: ["a"]
+ EOS
+ ) do |arguments|
+
+ # Two arguments are required
+ raise(Puppet::ParseError, "difference(): Wrong number of arguments " +
+ "given (#{arguments.size} for 2)") if arguments.size != 2
+
+ first = arguments[0]
+ second = arguments[1]
+
+ unless first.is_a?(Array) && second.is_a?(Array)
+ raise(Puppet::ParseError, 'difference(): Requires 2 arrays')
+ end
+
+ result = first - second
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :