mpagenko | af80163 | 2020-07-03 10:00:42 +0000 | [diff] [blame] | 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 | |
| 5 | package impl |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "reflect" |
| 10 | |
| 11 | pref "google.golang.org/protobuf/reflect/protoreflect" |
| 12 | ) |
| 13 | |
| 14 | func newListConverter(t reflect.Type, fd pref.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 | |
| 24 | type listConverter struct { |
| 25 | goType reflect.Type // []T |
| 26 | c Converter |
| 27 | } |
| 28 | |
| 29 | func (c *listConverter) PBValueOf(v reflect.Value) pref.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 pref.ValueOfList(&listReflect{pv, c.c}) |
| 36 | } |
| 37 | |
| 38 | func (c *listConverter) GoValueOf(v pref.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 | |
| 46 | func (c *listConverter) IsValidPB(v pref.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 | |
| 54 | func (c *listConverter) IsValidGo(v reflect.Value) bool { |
| 55 | return v.IsValid() && v.Type() == c.goType |
| 56 | } |
| 57 | |
| 58 | func (c *listConverter) New() pref.Value { |
| 59 | return pref.ValueOfList(&listReflect{reflect.New(c.goType), c.c}) |
| 60 | } |
| 61 | |
| 62 | func (c *listConverter) Zero() pref.Value { |
| 63 | return pref.ValueOfList(&listReflect{reflect.Zero(reflect.PtrTo(c.goType)), c.c}) |
| 64 | } |
| 65 | |
| 66 | type listPtrConverter struct { |
| 67 | goType reflect.Type // *[]T |
| 68 | c Converter |
| 69 | } |
| 70 | |
| 71 | func (c *listPtrConverter) PBValueOf(v reflect.Value) pref.Value { |
| 72 | if v.Type() != c.goType { |
| 73 | panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType)) |
| 74 | } |
| 75 | return pref.ValueOfList(&listReflect{v, c.c}) |
| 76 | } |
| 77 | |
| 78 | func (c *listPtrConverter) GoValueOf(v pref.Value) reflect.Value { |
| 79 | return v.List().(*listReflect).v |
| 80 | } |
| 81 | |
| 82 | func (c *listPtrConverter) IsValidPB(v pref.Value) bool { |
| 83 | list, ok := v.Interface().(*listReflect) |
| 84 | if !ok { |
| 85 | return false |
| 86 | } |
| 87 | return list.v.Type() == c.goType |
| 88 | } |
| 89 | |
| 90 | func (c *listPtrConverter) IsValidGo(v reflect.Value) bool { |
| 91 | return v.IsValid() && v.Type() == c.goType |
| 92 | } |
| 93 | |
| 94 | func (c *listPtrConverter) New() pref.Value { |
| 95 | return c.PBValueOf(reflect.New(c.goType.Elem())) |
| 96 | } |
| 97 | |
| 98 | func (c *listPtrConverter) Zero() pref.Value { |
| 99 | return c.PBValueOf(reflect.Zero(c.goType)) |
| 100 | } |
| 101 | |
| 102 | type listReflect struct { |
| 103 | v reflect.Value // *[]T |
| 104 | conv Converter |
| 105 | } |
| 106 | |
| 107 | func (ls *listReflect) Len() int { |
| 108 | if ls.v.IsNil() { |
| 109 | return 0 |
| 110 | } |
| 111 | return ls.v.Elem().Len() |
| 112 | } |
| 113 | func (ls *listReflect) Get(i int) pref.Value { |
| 114 | return ls.conv.PBValueOf(ls.v.Elem().Index(i)) |
| 115 | } |
| 116 | func (ls *listReflect) Set(i int, v pref.Value) { |
| 117 | ls.v.Elem().Index(i).Set(ls.conv.GoValueOf(v)) |
| 118 | } |
| 119 | func (ls *listReflect) Append(v pref.Value) { |
| 120 | ls.v.Elem().Set(reflect.Append(ls.v.Elem(), ls.conv.GoValueOf(v))) |
| 121 | } |
| 122 | func (ls *listReflect) AppendMutable() pref.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 | } |
| 130 | func (ls *listReflect) Truncate(i int) { |
| 131 | ls.v.Elem().Set(ls.v.Elem().Slice(0, i)) |
| 132 | } |
| 133 | func (ls *listReflect) NewElement() pref.Value { |
| 134 | return ls.conv.New() |
| 135 | } |
| 136 | func (ls *listReflect) IsValid() bool { |
| 137 | return !ls.v.IsNil() |
| 138 | } |
| 139 | func (ls *listReflect) protoUnwrap() interface{} { |
| 140 | return ls.v.Interface() |
| 141 | } |