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-rw-r--r--lib/puppet/parser/functions/has_key.rb27
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/has_key.rb b/lib/puppet/parser/functions/has_key.rb
new file mode 100644
index 0000000..9c1c4c3
--- /dev/null
+++ b/lib/puppet/parser/functions/has_key.rb
@@ -0,0 +1,27 @@
+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