forked from mirror/go-json
84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
package json
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import (
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"unsafe"
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)
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type unmarshalJSONDecoder struct {
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typ *rtype
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isDoublePointer bool
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structName string
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fieldName string
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}
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func newUnmarshalJSONDecoder(typ *rtype, structName, fieldName string) *unmarshalJSONDecoder {
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return &unmarshalJSONDecoder{
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typ: typ,
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structName: structName,
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fieldName: fieldName,
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}
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}
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func (d *unmarshalJSONDecoder) annotateError(cursor int64, err error) {
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switch e := err.(type) {
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case *UnmarshalTypeError:
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e.Struct = d.structName
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e.Field = d.fieldName
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case *SyntaxError:
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e.Offset = cursor
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}
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}
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func (d *unmarshalJSONDecoder) decodeStream(s *stream, p unsafe.Pointer) error {
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s.skipWhiteSpace()
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start := s.cursor
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if err := s.skipValue(); err != nil {
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return err
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}
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src := s.buf[start:s.cursor]
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dst := make([]byte, len(src))
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copy(dst, src)
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v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
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typ: d.typ,
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ptr: p,
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}))
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if err := v.(Unmarshaler).UnmarshalJSON(dst); err != nil {
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d.annotateError(s.cursor, err)
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return err
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}
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return nil
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}
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func (d *unmarshalJSONDecoder) decode(buf []byte, cursor int64, p unsafe.Pointer) (int64, error) {
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cursor = skipWhiteSpace(buf, cursor)
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start := cursor
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end, err := skipValue(buf, cursor)
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if err != nil {
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return 0, err
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}
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src := buf[start:end]
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if d.isDoublePointer {
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newptr := unsafe_New(d.typ.Elem())
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v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
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typ: d.typ,
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ptr: newptr,
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}))
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if err := v.(Unmarshaler).UnmarshalJSON(src); err != nil {
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d.annotateError(cursor, err)
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return 0, err
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}
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*(*unsafe.Pointer)(p) = newptr
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} else {
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v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
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typ: d.typ,
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ptr: p,
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}))
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if err := v.(Unmarshaler).UnmarshalJSON(src); err != nil {
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d.annotateError(cursor, err)
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return 0, err
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}
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}
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return end, nil
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}
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