go-json/decode_array.go

126 lines
2.5 KiB
Go

package json
import (
"unsafe"
)
type arrayDecoder struct {
elemType *rtype
size uintptr
valueDecoder decoder
alen int
structName string
fieldName string
}
func newArrayDecoder(dec decoder, elemType *rtype, alen int, structName, fieldName string) *arrayDecoder {
return &arrayDecoder{
valueDecoder: dec,
elemType: elemType,
size: elemType.Size(),
alen: alen,
structName: structName,
fieldName: fieldName,
}
}
func (d *arrayDecoder) decodeStream(s *stream, p unsafe.Pointer) error {
for {
switch s.char() {
case ' ', '\n', '\t', '\r':
case 'n':
if err := nullBytes(s); err != nil {
return err
}
return nil
case '[':
idx := 0
for {
s.cursor++
if idx < d.alen {
if err := d.valueDecoder.decodeStream(s, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size)); err != nil {
return err
}
} else {
if err := s.skipValue(); err != nil {
return err
}
}
s.skipWhiteSpace()
switch s.char() {
case ']':
s.cursor++
return nil
case ',':
idx++
case nul:
if s.read() {
continue
}
goto ERROR
default:
goto ERROR
}
}
case nul:
if s.read() {
continue
}
goto ERROR
default:
goto ERROR
}
s.cursor++
}
ERROR:
return errUnexpectedEndOfJSON("array", s.totalOffset())
}
func (d *arrayDecoder) decode(buf []byte, cursor int64, p unsafe.Pointer) (int64, error) {
buflen := int64(len(buf))
for ; cursor < buflen; cursor++ {
switch buf[cursor] {
case ' ', '\n', '\t', '\r':
continue
case 'n':
buflen := int64(len(buf))
if cursor+3 >= buflen {
return 0, errUnexpectedEndOfJSON("null", cursor)
}
if buf[cursor+1] != 'u' {
return 0, errInvalidCharacter(buf[cursor+1], "null", cursor)
}
if buf[cursor+2] != 'l' {
return 0, errInvalidCharacter(buf[cursor+2], "null", cursor)
}
if buf[cursor+3] != 'l' {
return 0, errInvalidCharacter(buf[cursor+3], "null", cursor)
}
cursor += 4
return cursor, nil
case '[':
idx := 0
for {
cursor++
c, err := d.valueDecoder.decode(buf, cursor, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size))
if err != nil {
return 0, err
}
cursor = c
cursor = skipWhiteSpace(buf, cursor)
switch buf[cursor] {
case ']':
cursor++
return cursor, nil
case ',':
idx++
continue
default:
return 0, errInvalidCharacter(buf[cursor], "array", cursor)
}
}
}
}
return 0, errUnexpectedEndOfJSON("array", cursor)
}