1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/hil/transform_fixed.go b/vendor/github.com/hashicorp/hil/transform_fixed.go
new file mode 100644
index 00000000..e69df294
--- /dev/null
+++ b/vendor/github.com/hashicorp/hil/transform_fixed.go
@@ -0,0 +1,29 @@
+package hil
+
+import (
+	"github.com/hashicorp/hil/ast"
+)
+
+// FixedValueTransform transforms an AST to return a fixed value for
+// all interpolations. i.e. you can make "hi ${anything}" always
+// turn into "hi foo".
+//
+// The primary use case for this is for config validations where you can
+// verify that interpolations result in a certain type of string.
+func FixedValueTransform(root ast.Node, Value *ast.LiteralNode) ast.Node {
+	// We visit the nodes in top-down order
+	result := root
+	switch n := result.(type) {
+	case *ast.Output:
+		for i, v := range n.Exprs {
+			n.Exprs[i] = FixedValueTransform(v, Value)
+		}
+	case *ast.LiteralNode:
+		// We keep it as-is
+	default:
+		// Anything else we replace
+		result = Value
+	}
+
+	return result
+}