[github/fretlink/terraform-provider-statuscake.git] / vendor / github.com / hashicorp / terraform / terraform / eval_filter.go

package terraform

// EvalNodeFilterFunc is the callback used to replace a node with
// another to node. To not do the replacement, just return the input node.
type EvalNodeFilterFunc func(EvalNode) EvalNode

// EvalNodeFilterable is an interface that can be implemented by
// EvalNodes to allow filtering of sub-elements. Note that this isn't
// a common thing to implement and you probably don't need it.
type EvalNodeFilterable interface {
	EvalNode
	Filter(EvalNodeFilterFunc)
}

// EvalFilter runs the filter on the given node and returns the
// final filtered value. This should be called rather than checking
// the EvalNode directly since this will properly handle EvalNodeFilterables.
func EvalFilter(node EvalNode, fn EvalNodeFilterFunc) EvalNode {
	if f, ok := node.(EvalNodeFilterable); ok {
		f.Filter(fn)
		return node
	}

	return fn(node)
}
Commit	Line	Data
bae9f6d2 JC	1	package terraform
	2
	3	// EvalNodeFilterFunc is the callback used to replace a node with
	4	// another to node. To not do the replacement, just return the input node.
	5	type EvalNodeFilterFunc func(EvalNode) EvalNode
	6
	7	// EvalNodeFilterable is an interface that can be implemented by
	8	// EvalNodes to allow filtering of sub-elements. Note that this isn't
	9	// a common thing to implement and you probably don't need it.
	10	type EvalNodeFilterable interface {
	11	EvalNode
	12	Filter(EvalNodeFilterFunc)
	13	}
	14
	15	// EvalFilter runs the filter on the given node and returns the
	16	// final filtered value. This should be called rather than checking
	17	// the EvalNode directly since this will properly handle EvalNodeFilterables.
	18	func EvalFilter(node EvalNode, fn EvalNodeFilterFunc) EvalNode {
	19	if f, ok := node.(EvalNodeFilterable); ok {
	20	f.Filter(fn)
	21	return node
	22	}
	23
	24	return fn(node)
	25	}