Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/internal/ref/ref.go

@@ -0,0 +1,36 @@
+// Copyright 2020 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 ref implements internal helpers for references
+package ref
+
+import (
+	"errors"
+
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/storage"
+	"github.com/open-policy-agent/opa/v1/util"
+)
+
+// ParseDataPath returns a ref from the slash separated path s rooted at data.
+// All path segments are treated as identifier strings.
+func ParseDataPath(s string) (ast.Ref, error) {
+	path, ok := storage.ParsePath(util.WithPrefix(s, "/"))
+	if !ok {
+		return nil, errors.New("invalid path")
+	}
+
+	return path.Ref(ast.DefaultRootDocument), nil
+}
+
+// ArrayPath will take an ast.Array and build an ast.Ref using the ast.Terms in the Array
+func ArrayPath(a *ast.Array) ast.Ref {
+	ref := make(ast.Ref, 0, a.Len())
+
+	a.Foreach(func(term *ast.Term) {
+		ref = append(ref, term)
+	})
+
+	return ref
+}