| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package impl |
| |
| import ( |
| "fmt" |
| "reflect" |
| |
| pref "google.golang.org/protobuf/reflect/protoreflect" |
| ) |
| |
| func newListConverter(t reflect.Type, fd pref.FieldDescriptor) Converter { |
| switch { |
| case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Slice: |
| return &listPtrConverter{t, newSingularConverter(t.Elem().Elem(), fd)} |
| case t.Kind() == reflect.Slice: |
| return &listConverter{t, newSingularConverter(t.Elem(), fd)} |
| } |
| panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName())) |
| } |
| |
| type listConverter struct { |
| goType reflect.Type |
| c Converter |
| } |
| |
| func (c *listConverter) PBValueOf(v reflect.Value) pref.Value { |
| if v.Type() != c.goType { |
| panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType)) |
| } |
| pv := reflect.New(c.goType) |
| pv.Elem().Set(v) |
| return pref.ValueOfList(&listReflect{pv, c.c}) |
| } |
| |
| func (c *listConverter) GoValueOf(v pref.Value) reflect.Value { |
| rv := v.List().(*listReflect).v |
| if rv.IsNil() { |
| return reflect.Zero(c.goType) |
| } |
| return rv.Elem() |
| } |
| |
| func (c *listConverter) IsValidPB(v pref.Value) bool { |
| list, ok := v.Interface().(*listReflect) |
| if !ok { |
| return false |
| } |
| return list.v.Type().Elem() == c.goType && list.IsValid() |
| } |
| |
| func (c *listConverter) IsValidGo(v reflect.Value) bool { |
| return v.Type() == c.goType |
| } |
| |
| func (c *listConverter) New() pref.Value { |
| return pref.ValueOfList(&listReflect{reflect.New(c.goType), c.c}) |
| } |
| |
| func (c *listConverter) Zero() pref.Value { |
| return pref.ValueOfList(&listReflect{reflect.Zero(reflect.PtrTo(c.goType)), c.c}) |
| } |
| |
| type listPtrConverter struct { |
| goType reflect.Type |
| c Converter |
| } |
| |
| func (c *listPtrConverter) PBValueOf(v reflect.Value) pref.Value { |
| if v.Type() != c.goType { |
| panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType)) |
| } |
| return pref.ValueOfList(&listReflect{v, c.c}) |
| } |
| |
| func (c *listPtrConverter) GoValueOf(v pref.Value) reflect.Value { |
| return v.List().(*listReflect).v |
| } |
| |
| func (c *listPtrConverter) IsValidPB(v pref.Value) bool { |
| list, ok := v.Interface().(*listReflect) |
| if !ok { |
| return false |
| } |
| return list.v.Type() == c.goType |
| } |
| |
| func (c *listPtrConverter) IsValidGo(v reflect.Value) bool { |
| return v.Type() == c.goType |
| } |
| |
| func (c *listPtrConverter) New() pref.Value { |
| return c.PBValueOf(reflect.New(c.goType.Elem())) |
| } |
| |
| func (c *listPtrConverter) Zero() pref.Value { |
| return c.PBValueOf(reflect.Zero(c.goType)) |
| } |
| |
| type listReflect struct { |
| v reflect.Value // *[]T |
| conv Converter |
| } |
| |
| func (ls *listReflect) Len() int { |
| if ls.v.IsNil() { |
| return 0 |
| } |
| return ls.v.Elem().Len() |
| } |
| func (ls *listReflect) Get(i int) pref.Value { |
| return ls.conv.PBValueOf(ls.v.Elem().Index(i)) |
| } |
| func (ls *listReflect) Set(i int, v pref.Value) { |
| ls.v.Elem().Index(i).Set(ls.conv.GoValueOf(v)) |
| } |
| func (ls *listReflect) Append(v pref.Value) { |
| ls.v.Elem().Set(reflect.Append(ls.v.Elem(), ls.conv.GoValueOf(v))) |
| } |
| func (ls *listReflect) AppendMutable() pref.Value { |
| if _, ok := ls.conv.(*messageConverter); !ok { |
| panic("invalid AppendMutable on list with non-message type") |
| } |
| v := ls.NewElement() |
| ls.Append(v) |
| return v |
| } |
| func (ls *listReflect) Truncate(i int) { |
| ls.v.Elem().Set(ls.v.Elem().Slice(0, i)) |
| } |
| func (ls *listReflect) NewElement() pref.Value { |
| return ls.conv.New() |
| } |
| func (ls *listReflect) IsValid() bool { |
| return !ls.v.IsNil() |
| } |
| func (ls *listReflect) protoUnwrap() interface{} { |
| return ls.v.Interface() |
| } |