1 files changed, 25 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/terraform/terraform/eval_filter.go b/vendor/github.com/hashicorp/terraform/terraform/eval_filter.go
new file mode 100644
index 00000000..711c625c
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/terraform/eval_filter.go
@@ -0,0 +1,25 @@
+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)
+}