text: // Copyright 2017 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 protostruct supports operations on the protocol buffer Struct message.
  package protostruct
  
  import (
  	pb "github.com/golang/protobuf/ptypes/struct"
  )
  
  // DecodeToMap converts a pb.Struct to a map from strings to Go types.
  // DecodeToMap panics if s is invalid.
  func DecodeToMap(s *pb.Struct) map[string]interface{} {
  	if s == nil {
  		return nil
  	}
  	m := map[string]interface{}{}
  	for k, v := range s.Fields {
  		m[k] = decodeValue(v)
  	}
  	return m
  }
  
  func decodeValue(v *pb.Value) interface{} {
  	switch k := v.Kind.(type) {
  	case *pb.Value_NullValue:
  		return nil
  	case *pb.Value_NumberValue:
  		return k.NumberValue
  	case *pb.Value_StringValue:
  		return k.StringValue
  	case *pb.Value_BoolValue:
  		return k.BoolValue
  	case *pb.Value_StructValue:
  		return DecodeToMap(k.StructValue)
  	case *pb.Value_ListValue:
  		s := make([]interface{}, len(k.ListValue.Values))
  		for i, e := range k.ListValue.Values {
  			s[i] = decodeValue(e)
  		}
  		return s
  	default:
  		panic("protostruct: unknown kind")
  	}
  }
  