Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/ast/transform.go

@@ -0,0 +1,46 @@
+// Copyright 2016 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package ast
+
+import (
+	v1 "github.com/open-policy-agent/opa/v1/ast"
+)
+
+// Transformer defines the interface for transforming AST elements. If the
+// transformer returns nil and does not indicate an error, the AST element will
+// be set to nil and no transformations will be applied to children of the
+// element.
+type Transformer = v1.Transformer
+
+// Transform iterates the AST and calls the Transform function on the
+// Transformer t for x before recursing.
+func Transform(t Transformer, x any) (any, error) {
+	return v1.Transform(t, x)
+}
+
+// TransformRefs calls the function f on all references under x.
+func TransformRefs(x any, f func(Ref) (Value, error)) (any, error) {
+	return v1.TransformRefs(x, f)
+}
+
+// TransformVars calls the function f on all vars under x.
+func TransformVars(x any, f func(Var) (Value, error)) (any, error) {
+	return v1.TransformVars(x, f)
+}
+
+// TransformComprehensions calls the functio nf on all comprehensions under x.
+func TransformComprehensions(x any, f func(any) (Value, error)) (any, error) {
+	return v1.TransformComprehensions(x, f)
+}
+
+// GenericTransformer implements the Transformer interface to provide a utility
+// to transform AST nodes using a closure.
+type GenericTransformer = v1.GenericTransformer
+
+// NewGenericTransformer returns a new GenericTransformer that will transform
+// AST nodes using the function f.
+func NewGenericTransformer(f func(x any) (any, error)) *GenericTransformer {
+	return v1.NewGenericTransformer(f)
+}