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-rw-r--r--lib/puppet/parser/functions/delete_at.rb49
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/delete_at.rb b/lib/puppet/parser/functions/delete_at.rb
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index 0000000..3eb4b53
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+++ b/lib/puppet/parser/functions/delete_at.rb
@@ -0,0 +1,49 @@
+#
+# delete_at.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:delete_at, :type => :rvalue, :doc => <<-EOS
+Deletes a determined indexed value from an array.
+
+*Examples:*
+
+ delete_at(['a','b','c'], 1)
+
+Would return: ['a','c']
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "delete_at(): Wrong number of arguments " +
+ "given (#{arguments.size} for 2)") if arguments.size < 2
+
+ array = arguments[0]
+
+ unless array.is_a?(Array)
+ raise(Puppet::ParseError, 'delete_at(): Requires array to work with')
+ end
+
+ index = arguments[1]
+
+ if index.is_a?(String) and not index.match(/^\d+$/)
+ raise(Puppet::ParseError, 'delete_at(): You must provide ' +
+ 'non-negative numeric index')
+ end
+
+ result = array.clone
+
+ # Numbers in Puppet are often string-encoded which is troublesome ...
+ index = index.to_i
+
+ if index > result.size - 1 # First element is at index 0 is it not?
+ raise(Puppet::ParseError, 'delete_at(): Given index ' +
+ 'exceeds size of array given')
+ end
+
+ result.delete_at(index) # We ignore the element that got deleted ...
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :