# Called within a class definition, establishes a containment
# relationship with another class

Puppet::Parser::Functions::newfunction(
  :contain,
  :arity => -2,
  :doc => "Contain one or more classes inside the current class. If any of
these classes are undeclared, they will be declared as if called with the
`include` function. Accepts a class name, an array of class names, or a
comma-separated list of class names.

A contained class will not be applied before the containing class is
begun, and will be finished before the containing class is finished.
"
) do |classes|
  scope = self

  scope.function_include(classes)

  classes.each do |class_name|
    class_resource = scope.catalog.resource("Class", class_name)
    if ! scope.catalog.edge?(scope.resource, class_resource)
      scope.catalog.add_edge(scope.resource, class_resource)
    end
  end
end