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

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

@@ -0,0 +1,49 @@
+// 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 (
+	exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
+)
+
+type mapping struct {
+	mapping map[string]*exprpb.Type
+}
+
+func newMapping() *mapping {
+	return &mapping{
+		mapping: make(map[string]*exprpb.Type),
+	}
+}
+
+func (m *mapping) add(from *exprpb.Type, to *exprpb.Type) {
+	m.mapping[typeKey(from)] = to
+}
+
+func (m *mapping) find(from *exprpb.Type) (*exprpb.Type, bool) {
+	if r, found := m.mapping[typeKey(from)]; found {
+		return r, found
+	}
+	return nil, false
+}
+
+func (m *mapping) copy() *mapping {
+	c := newMapping()
+
+	for k, v := range m.mapping {
+		c.mapping[k] = v
+	}
+	return c
+}