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|
package decoder
import (
"fmt"
"unsafe"
"github.com/goccy/go-json/internal/errors"
"github.com/goccy/go-json/internal/runtime"
)
type arrayDecoder struct {
elemType *runtime.Type
size uintptr
valueDecoder Decoder
alen int
structName string
fieldName string
zeroValue unsafe.Pointer
}
func newArrayDecoder(dec Decoder, elemType *runtime.Type, alen int, structName, fieldName string) *arrayDecoder {
// workaround to avoid checkptr errors. cannot use `*(*unsafe.Pointer)(unsafe_New(elemType))` directly.
zeroValuePtr := unsafe_New(elemType)
zeroValue := **(**unsafe.Pointer)(unsafe.Pointer(&zeroValuePtr))
return &arrayDecoder{
valueDecoder: dec,
elemType: elemType,
size: elemType.Size(),
alen: alen,
structName: structName,
fieldName: fieldName,
zeroValue: zeroValue,
}
}
func (d *arrayDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
depth++
if depth > maxDecodeNestingDepth {
return errors.ErrExceededMaxDepth(s.char(), s.cursor)
}
for {
switch s.char() {
case ' ', '\n', '\t', '\r':
case 'n':
if err := nullBytes(s); err != nil {
return err
}
return nil
case '[':
idx := 0
s.cursor++
if s.skipWhiteSpace() == ']' {
for idx < d.alen {
*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
idx++
}
s.cursor++
return nil
}
for {
if idx < d.alen {
if err := d.valueDecoder.DecodeStream(s, depth, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size)); err != nil {
return err
}
} else {
if err := s.skipValue(depth); err != nil {
return err
}
}
idx++
switch s.skipWhiteSpace() {
case ']':
for idx < d.alen {
*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
idx++
}
s.cursor++
return nil
case ',':
s.cursor++
continue
case nul:
if s.read() {
s.cursor++
continue
}
goto ERROR
default:
goto ERROR
}
}
case nul:
if s.read() {
continue
}
goto ERROR
default:
goto ERROR
}
s.cursor++
}
ERROR:
return errors.ErrUnexpectedEndOfJSON("array", s.totalOffset())
}
func (d *arrayDecoder) 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)
}
for {
switch buf[cursor] {
case ' ', '\n', '\t', '\r':
cursor++
continue
case 'n':
if err := validateNull(buf, cursor); err != nil {
return 0, err
}
cursor += 4
return cursor, nil
case '[':
idx := 0
cursor++
cursor = skipWhiteSpace(buf, cursor)
if buf[cursor] == ']' {
for idx < d.alen {
*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
idx++
}
cursor++
return cursor, nil
}
for {
if idx < d.alen {
c, err := d.valueDecoder.Decode(ctx, cursor, depth, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size))
if err != nil {
return 0, err
}
cursor = c
} else {
c, err := skipValue(buf, cursor, depth)
if err != nil {
return 0, err
}
cursor = c
}
idx++
cursor = skipWhiteSpace(buf, cursor)
switch buf[cursor] {
case ']':
for idx < d.alen {
*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
idx++
}
cursor++
return cursor, nil
case ',':
cursor++
continue
default:
return 0, errors.ErrInvalidCharacter(buf[cursor], "array", cursor)
}
}
default:
return 0, errors.ErrUnexpectedEndOfJSON("array", cursor)
}
}
}
func (d *arrayDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
return nil, 0, fmt.Errorf("json: array decoder does not support decode path")
}
|
