1 files changed, 28 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/lib/puppet/parser/functions/has_key.rb b/puppet/modules/stdlib/lib/puppet/parser/functions/has_key.rb
new file mode 100644
index 00000000..4657cc29
--- /dev/null
+++ b/puppet/modules/stdlib/lib/puppet/parser/functions/has_key.rb
@@ -0,0 +1,28 @@
+module Puppet::Parser::Functions
+
+  newfunction(:has_key, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
+    Determine if a hash has a certain key value.
+
+    Example:
+
+        $my_hash = {'key_one' => 'value_one'}
+        if has_key($my_hash, 'key_two') {
+          notice('we will not reach here')
+        }
+        if has_key($my_hash, 'key_one') {
+          notice('this will be printed')
+        }
+
+    ENDHEREDOC
+
+    unless args.length == 2
+      raise Puppet::ParseError, ("has_key(): wrong number of arguments (#{args.length}; must be 2)")
+    end
+    unless args[0].is_a?(Hash)
+      raise Puppet::ParseError, "has_key(): expects the first argument to be a hash, got #{args[0].inspect} which is of type #{args[0].class}"
+    end
+    args[0].has_key?(args[1])
+
+  end
+
+end