mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
188 lines
4.7 KiB
Go
188 lines
4.7 KiB
Go
|
package decoder
|
||
|
|
||
|
import (
|
||
|
"reflect"
|
||
|
"unsafe"
|
||
|
|
||
|
"github.com/goccy/go-json/internal/errors"
|
||
|
"github.com/goccy/go-json/internal/runtime"
|
||
|
)
|
||
|
|
||
|
type mapDecoder struct {
|
||
|
mapType *runtime.Type
|
||
|
keyType *runtime.Type
|
||
|
valueType *runtime.Type
|
||
|
canUseAssignFaststrType bool
|
||
|
keyDecoder Decoder
|
||
|
valueDecoder Decoder
|
||
|
structName string
|
||
|
fieldName string
|
||
|
}
|
||
|
|
||
|
func newMapDecoder(mapType *runtime.Type, keyType *runtime.Type, keyDec Decoder, valueType *runtime.Type, valueDec Decoder, structName, fieldName string) *mapDecoder {
|
||
|
return &mapDecoder{
|
||
|
mapType: mapType,
|
||
|
keyDecoder: keyDec,
|
||
|
keyType: keyType,
|
||
|
canUseAssignFaststrType: canUseAssignFaststrType(keyType, valueType),
|
||
|
valueType: valueType,
|
||
|
valueDecoder: valueDec,
|
||
|
structName: structName,
|
||
|
fieldName: fieldName,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
const (
|
||
|
mapMaxElemSize = 128
|
||
|
)
|
||
|
|
||
|
// See detail: https://github.com/goccy/go-json/pull/283
|
||
|
func canUseAssignFaststrType(key *runtime.Type, value *runtime.Type) bool {
|
||
|
indirectElem := value.Size() > mapMaxElemSize
|
||
|
if indirectElem {
|
||
|
return false
|
||
|
}
|
||
|
return key.Kind() == reflect.String
|
||
|
}
|
||
|
|
||
|
//go:linkname makemap reflect.makemap
|
||
|
func makemap(*runtime.Type, int) unsafe.Pointer
|
||
|
|
||
|
//nolint:golint
|
||
|
//go:linkname mapassign_faststr runtime.mapassign_faststr
|
||
|
//go:noescape
|
||
|
func mapassign_faststr(t *runtime.Type, m unsafe.Pointer, s string) unsafe.Pointer
|
||
|
|
||
|
//go:linkname mapassign reflect.mapassign
|
||
|
//go:noescape
|
||
|
func mapassign(t *runtime.Type, m unsafe.Pointer, k, v unsafe.Pointer)
|
||
|
|
||
|
func (d *mapDecoder) mapassign(t *runtime.Type, m, k, v unsafe.Pointer) {
|
||
|
if d.canUseAssignFaststrType {
|
||
|
mapV := mapassign_faststr(t, m, *(*string)(k))
|
||
|
typedmemmove(d.valueType, mapV, v)
|
||
|
} else {
|
||
|
mapassign(t, m, k, v)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (d *mapDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
|
||
|
depth++
|
||
|
if depth > maxDecodeNestingDepth {
|
||
|
return errors.ErrExceededMaxDepth(s.char(), s.cursor)
|
||
|
}
|
||
|
|
||
|
switch s.skipWhiteSpace() {
|
||
|
case 'n':
|
||
|
if err := nullBytes(s); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = nil
|
||
|
return nil
|
||
|
case '{':
|
||
|
default:
|
||
|
return errors.ErrExpected("{ character for map value", s.totalOffset())
|
||
|
}
|
||
|
mapValue := *(*unsafe.Pointer)(p)
|
||
|
if mapValue == nil {
|
||
|
mapValue = makemap(d.mapType, 0)
|
||
|
}
|
||
|
s.cursor++
|
||
|
if s.equalChar('}') {
|
||
|
*(*unsafe.Pointer)(p) = mapValue
|
||
|
s.cursor++
|
||
|
return nil
|
||
|
}
|
||
|
for {
|
||
|
k := unsafe_New(d.keyType)
|
||
|
if err := d.keyDecoder.DecodeStream(s, depth, k); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
s.skipWhiteSpace()
|
||
|
if !s.equalChar(':') {
|
||
|
return errors.ErrExpected("colon after object key", s.totalOffset())
|
||
|
}
|
||
|
s.cursor++
|
||
|
v := unsafe_New(d.valueType)
|
||
|
if err := d.valueDecoder.DecodeStream(s, depth, v); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
d.mapassign(d.mapType, mapValue, k, v)
|
||
|
s.skipWhiteSpace()
|
||
|
if s.equalChar('}') {
|
||
|
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = mapValue
|
||
|
s.cursor++
|
||
|
return nil
|
||
|
}
|
||
|
if !s.equalChar(',') {
|
||
|
return errors.ErrExpected("comma after object value", s.totalOffset())
|
||
|
}
|
||
|
s.cursor++
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (d *mapDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
|
||
|
buf := ctx.Buf
|
||
|
depth++
|
||
|
if depth > maxDecodeNestingDepth {
|
||
|
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
|
||
|
}
|
||
|
|
||
|
cursor = skipWhiteSpace(buf, cursor)
|
||
|
buflen := int64(len(buf))
|
||
|
if buflen < 2 {
|
||
|
return 0, errors.ErrExpected("{} for map", cursor)
|
||
|
}
|
||
|
switch buf[cursor] {
|
||
|
case 'n':
|
||
|
if err := validateNull(buf, cursor); err != nil {
|
||
|
return 0, err
|
||
|
}
|
||
|
cursor += 4
|
||
|
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = nil
|
||
|
return cursor, nil
|
||
|
case '{':
|
||
|
default:
|
||
|
return 0, errors.ErrExpected("{ character for map value", cursor)
|
||
|
}
|
||
|
cursor++
|
||
|
cursor = skipWhiteSpace(buf, cursor)
|
||
|
mapValue := *(*unsafe.Pointer)(p)
|
||
|
if mapValue == nil {
|
||
|
mapValue = makemap(d.mapType, 0)
|
||
|
}
|
||
|
if buf[cursor] == '}' {
|
||
|
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = mapValue
|
||
|
cursor++
|
||
|
return cursor, nil
|
||
|
}
|
||
|
for {
|
||
|
k := unsafe_New(d.keyType)
|
||
|
keyCursor, err := d.keyDecoder.Decode(ctx, cursor, depth, k)
|
||
|
if err != nil {
|
||
|
return 0, err
|
||
|
}
|
||
|
cursor = skipWhiteSpace(buf, keyCursor)
|
||
|
if buf[cursor] != ':' {
|
||
|
return 0, errors.ErrExpected("colon after object key", cursor)
|
||
|
}
|
||
|
cursor++
|
||
|
v := unsafe_New(d.valueType)
|
||
|
valueCursor, err := d.valueDecoder.Decode(ctx, cursor, depth, v)
|
||
|
if err != nil {
|
||
|
return 0, err
|
||
|
}
|
||
|
d.mapassign(d.mapType, mapValue, k, v)
|
||
|
cursor = skipWhiteSpace(buf, valueCursor)
|
||
|
if buf[cursor] == '}' {
|
||
|
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = mapValue
|
||
|
cursor++
|
||
|
return cursor, nil
|
||
|
}
|
||
|
if buf[cursor] != ',' {
|
||
|
return 0, errors.ErrExpected("comma after object value", cursor)
|
||
|
}
|
||
|
cursor++
|
||
|
}
|
||
|
}
|