First version. Simple delete_at function to use within Puppet DSL.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>

diff --git a/delete_at.rb b/delete_at.rb
new file mode 100644 (file)
index 0000000..c33f65a
--- /dev/null
+++ b/delete_at.rb
@@ -0,0 +1,42 @@
+#
+# delete_at.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:delete_at, :type => :rvalue, :doc => <<-EOS
+    EOS
+  ) do |arguments|
+
+    raise(Puppet::ParseError, "delete_at(): Wrong number of arguments " +
+      "given (#{arguments.size} for 2)") if arguments.size < 2
+
+    array = arguments[0]
+
+    if not array.is_a?(Array)
+      raise(Puppet::ParseError, 'delete_at(): Requires an array to work with')
+    end
+
+    index = arguments[1]
+
+    if not index.match(/^\d+$/)
+      raise(Puppet::ParseError, 'delete_at(): You must provide ' +
+        'positive numeric index')
+    end
+
+    result = array.clone
+
+    # In Puppet numbers are often string-encoded ...
+    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 array size')
+    end
+
+    result.delete_at(index) # We ignore the element that got deleted ...
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :