gtsocial-umbx

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defaults.go (1637B)

      1 // Copyright 2019 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package proto
      6 
      7 import (
      8 	"google.golang.org/protobuf/reflect/protoreflect"
      9 )
     10 
     11 // SetDefaults sets unpopulated scalar fields to their default values.
     12 // Fields within a oneof are not set even if they have a default value.
     13 // SetDefaults is recursively called upon any populated message fields.
     14 func SetDefaults(m Message) {
     15 	if m != nil {
     16 		setDefaults(MessageReflect(m))
     17 	}
     18 }
     19 
     20 func setDefaults(m protoreflect.Message) {
     21 	fds := m.Descriptor().Fields()
     22 	for i := 0; i < fds.Len(); i++ {
     23 		fd := fds.Get(i)
     24 		if !m.Has(fd) {
     25 			if fd.HasDefault() && fd.ContainingOneof() == nil {
     26 				v := fd.Default()
     27 				if fd.Kind() == protoreflect.BytesKind {
     28 					v = protoreflect.ValueOf(append([]byte(nil), v.Bytes()...)) // copy the default bytes
     29 				}
     30 				m.Set(fd, v)
     31 			}
     32 			continue
     33 		}
     34 	}
     35 
     36 	m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
     37 		switch {
     38 		// Handle singular message.
     39 		case fd.Cardinality() != protoreflect.Repeated:
     40 			if fd.Message() != nil {
     41 				setDefaults(m.Get(fd).Message())
     42 			}
     43 		// Handle list of messages.
     44 		case fd.IsList():
     45 			if fd.Message() != nil {
     46 				ls := m.Get(fd).List()
     47 				for i := 0; i < ls.Len(); i++ {
     48 					setDefaults(ls.Get(i).Message())
     49 				}
     50 			}
     51 		// Handle map of messages.
     52 		case fd.IsMap():
     53 			if fd.MapValue().Message() != nil {
     54 				ms := m.Get(fd).Map()
     55 				ms.Range(func(_ protoreflect.MapKey, v protoreflect.Value) bool {
     56 					setDefaults(v.Message())
     57 					return true
     58 				})
     59 			}
     60 		}
     61 		return true
     62 	})
     63 }