1// Copyright 2018 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
5package impl
6
7import (
8 "fmt"
9 "reflect"
10
11 "google.golang.org/protobuf/reflect/protoreflect"
12)
13
14func newListConverter(t reflect.Type, fd protoreflect.FieldDescriptor) Converter {
15 switch {
16 case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Slice:
17 return &listPtrConverter{t, newSingularConverter(t.Elem().Elem(), fd)}
18 case t.Kind() == reflect.Slice:
19 return &listConverter{t, newSingularConverter(t.Elem(), fd)}
20 }
21 panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
22}
23
24type listConverter struct {
25 goType reflect.Type // []T
26 c Converter
27}
28
29func (c *listConverter) PBValueOf(v reflect.Value) protoreflect.Value {
30 if v.Type() != c.goType {
31 panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
32 }
33 pv := reflect.New(c.goType)
34 pv.Elem().Set(v)
35 return protoreflect.ValueOfList(&listReflect{pv, c.c})
36}
37
38func (c *listConverter) GoValueOf(v protoreflect.Value) reflect.Value {
39 rv := v.List().(*listReflect).v
40 if rv.IsNil() {
41 return reflect.Zero(c.goType)
42 }
43 return rv.Elem()
44}
45
46func (c *listConverter) IsValidPB(v protoreflect.Value) bool {
47 list, ok := v.Interface().(*listReflect)
48 if !ok {
49 return false
50 }
51 return list.v.Type().Elem() == c.goType
52}
53
54func (c *listConverter) IsValidGo(v reflect.Value) bool {
55 return v.IsValid() && v.Type() == c.goType
56}
57
58func (c *listConverter) New() protoreflect.Value {
59 return protoreflect.ValueOfList(&listReflect{reflect.New(c.goType), c.c})
60}
61
62func (c *listConverter) Zero() protoreflect.Value {
63 return protoreflect.ValueOfList(&listReflect{reflect.Zero(reflect.PtrTo(c.goType)), c.c})
64}
65
66type listPtrConverter struct {
67 goType reflect.Type // *[]T
68 c Converter
69}
70
71func (c *listPtrConverter) PBValueOf(v reflect.Value) protoreflect.Value {
72 if v.Type() != c.goType {
73 panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
74 }
75 return protoreflect.ValueOfList(&listReflect{v, c.c})
76}
77
78func (c *listPtrConverter) GoValueOf(v protoreflect.Value) reflect.Value {
79 return v.List().(*listReflect).v
80}
81
82func (c *listPtrConverter) IsValidPB(v protoreflect.Value) bool {
83 list, ok := v.Interface().(*listReflect)
84 if !ok {
85 return false
86 }
87 return list.v.Type() == c.goType
88}
89
90func (c *listPtrConverter) IsValidGo(v reflect.Value) bool {
91 return v.IsValid() && v.Type() == c.goType
92}
93
94func (c *listPtrConverter) New() protoreflect.Value {
95 return c.PBValueOf(reflect.New(c.goType.Elem()))
96}
97
98func (c *listPtrConverter) Zero() protoreflect.Value {
99 return c.PBValueOf(reflect.Zero(c.goType))
100}
101
102type listReflect struct {
103 v reflect.Value // *[]T
104 conv Converter
105}
106
107func (ls *listReflect) Len() int {
108 if ls.v.IsNil() {
109 return 0
110 }
111 return ls.v.Elem().Len()
112}
113func (ls *listReflect) Get(i int) protoreflect.Value {
114 return ls.conv.PBValueOf(ls.v.Elem().Index(i))
115}
116func (ls *listReflect) Set(i int, v protoreflect.Value) {
117 ls.v.Elem().Index(i).Set(ls.conv.GoValueOf(v))
118}
119func (ls *listReflect) Append(v protoreflect.Value) {
120 ls.v.Elem().Set(reflect.Append(ls.v.Elem(), ls.conv.GoValueOf(v)))
121}
122func (ls *listReflect) AppendMutable() protoreflect.Value {
123 if _, ok := ls.conv.(*messageConverter); !ok {
124 panic("invalid AppendMutable on list with non-message type")
125 }
126 v := ls.NewElement()
127 ls.Append(v)
128 return v
129}
130func (ls *listReflect) Truncate(i int) {
131 ls.v.Elem().Set(ls.v.Elem().Slice(0, i))
132}
133func (ls *listReflect) NewElement() protoreflect.Value {
134 return ls.conv.New()
135}
136func (ls *listReflect) IsValid() bool {
137 return !ls.v.IsNil()
138}
139func (ls *listReflect) protoUnwrap() any {
140 return ls.v.Interface()
141}