Pin new dependency: github.com/google/cel-go v0.9.0

vendor/github.com/google/cel-go/checker/printer.go

@@ -0,0 +1,71 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package checker
+
+import (
+	"github.com/google/cel-go/common/debug"
+
+	exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
+)
+
+type semanticAdorner struct {
+	checks *exprpb.CheckedExpr
+}
+
+var _ debug.Adorner = &semanticAdorner{}
+
+func (a *semanticAdorner) GetMetadata(elem interface{}) string {
+	result := ""
+	e, isExpr := elem.(*exprpb.Expr)
+	if !isExpr {
+		return result
+	}
+	t := a.checks.TypeMap[e.Id]
+	if t != nil {
+		result += "~"
+		result += FormatCheckedType(t)
+	}
+
+	switch e.ExprKind.(type) {
+	case *exprpb.Expr_IdentExpr,
+		*exprpb.Expr_CallExpr,
+		*exprpb.Expr_StructExpr,
+		*exprpb.Expr_SelectExpr:
+		if ref, found := a.checks.ReferenceMap[e.Id]; found {
+			if len(ref.GetOverloadId()) == 0 {
+				result += "^" + ref.Name
+			} else {
+				for i, overload := range ref.OverloadId {
+					if i == 0 {
+						result += "^"
+					} else {
+						result += "|"
+					}
+					result += overload
+				}
+			}
+		}
+	}
+
+	return result
+}
+
+// Print returns a string representation of the Expr message,
+// annotated with types from the CheckedExpr.  The Expr must
+// be a sub-expression embedded in the CheckedExpr.
+func Print(e *exprpb.Expr, checks *exprpb.CheckedExpr) string {
+	a := &semanticAdorner{checks: checks}
+	return debug.ToAdornedDebugString(e, a)
+}