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|
package json
import (
"unsafe"
)
type mapDecoder struct {
mapType *rtype
keyType *rtype
valueType *rtype
keyDecoder decoder
valueDecoder decoder
structName string
fieldName string
}
func newMapDecoder(mapType *rtype, keyType *rtype, keyDec decoder, valueType *rtype, valueDec decoder, structName, fieldName string) *mapDecoder {
return &mapDecoder{
mapType: mapType,
keyDecoder: keyDec,
keyType: keyType,
valueType: valueType,
valueDecoder: valueDec,
structName: structName,
fieldName: fieldName,
}
}
//go:linkname makemap reflect.makemap
func makemap(*rtype, int) unsafe.Pointer
//go:linkname mapassign reflect.mapassign
//go:noescape
func mapassign(t *rtype, m unsafe.Pointer, key, val unsafe.Pointer)
func (d *mapDecoder) decodeStream(s *stream, depth int64, p unsafe.Pointer) error {
depth++
if depth > maxDecodeNestingDepth {
return errExceededMaxDepth(s.char(), s.cursor)
}
s.skipWhiteSpace()
switch s.char() {
case 'n':
if err := nullBytes(s); err != nil {
return err
}
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = nil
return nil
case '{':
default:
return errExpected("{ character for map value", s.totalOffset())
}
s.skipWhiteSpace()
mapValue := *(*unsafe.Pointer)(p)
if mapValue == nil {
mapValue = makemap(d.mapType, 0)
}
if s.buf[s.cursor+1] == '}' {
*(*unsafe.Pointer)(p) = mapValue
s.cursor += 2
return nil
}
for {
s.cursor++
k := unsafe_New(d.keyType)
if err := d.keyDecoder.decodeStream(s, depth, k); err != nil {
return err
}
s.skipWhiteSpace()
if !s.equalChar(':') {
return 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
}
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 errExpected("comma after object value", s.totalOffset())
}
}
}
func (d *mapDecoder) decode(buf []byte, cursor, depth int64, p unsafe.Pointer) (int64, error) {
depth++
if depth > maxDecodeNestingDepth {
return 0, errExceededMaxDepth(buf[cursor], cursor)
}
cursor = skipWhiteSpace(buf, cursor)
buflen := int64(len(buf))
if buflen < 2 {
return 0, 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, 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(buf, cursor, depth, k)
if err != nil {
return 0, err
}
cursor = skipWhiteSpace(buf, keyCursor)
if buf[cursor] != ':' {
return 0, errExpected("colon after object key", cursor)
}
cursor++
v := unsafe_New(d.valueType)
valueCursor, err := d.valueDecoder.decode(buf, cursor, depth, v)
if err != nil {
return 0, err
}
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, errExpected("comma after object value", cursor)
}
cursor++
}
}
|
