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package decoder
import (
"context"
"encoding/json"
"fmt"
"unsafe"
"github.com/goccy/go-json/internal/errors"
"github.com/goccy/go-json/internal/runtime"
)
type unmarshalJSONDecoder struct {
typ *runtime.Type
structName string
fieldName string
}
func newUnmarshalJSONDecoder(typ *runtime.Type, structName, fieldName string) *unmarshalJSONDecoder {
return &unmarshalJSONDecoder{
typ: typ,
structName: structName,
fieldName: fieldName,
}
}
func (d *unmarshalJSONDecoder) annotateError(cursor int64, err error) {
switch e := err.(type) {
case *errors.UnmarshalTypeError:
e.Struct = d.structName
e.Field = d.fieldName
case *errors.SyntaxError:
e.Offset = cursor
}
}
func (d *unmarshalJSONDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
s.skipWhiteSpace()
start := s.cursor
if err := s.skipValue(depth); err != nil {
return err
}
src := s.buf[start:s.cursor]
dst := make([]byte, len(src))
copy(dst, src)
v := *(*interface{})(unsafe.Pointer(&emptyInterface{
typ: d.typ,
ptr: p,
}))
switch v := v.(type) {
case unmarshalerContext:
var ctx context.Context
if (s.Option.Flags & ContextOption) != 0 {
ctx = s.Option.Context
} else {
ctx = context.Background()
}
if err := v.UnmarshalJSON(ctx, dst); err != nil {
d.annotateError(s.cursor, err)
return err
}
case json.Unmarshaler:
if err := v.UnmarshalJSON(dst); err != nil {
d.annotateError(s.cursor, err)
return err
}
}
return nil
}
func (d *unmarshalJSONDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
buf := ctx.Buf
cursor = skipWhiteSpace(buf, cursor)
start := cursor
end, err := skipValue(buf, cursor, depth)
if err != nil {
return 0, err
}
src := buf[start:end]
dst := make([]byte, len(src))
copy(dst, src)
v := *(*interface{})(unsafe.Pointer(&emptyInterface{
typ: d.typ,
ptr: p,
}))
if (ctx.Option.Flags & ContextOption) != 0 {
if err := v.(unmarshalerContext).UnmarshalJSON(ctx.Option.Context, dst); err != nil {
d.annotateError(cursor, err)
return 0, err
}
} else {
if err := v.(json.Unmarshaler).UnmarshalJSON(dst); err != nil {
d.annotateError(cursor, err)
return 0, err
}
}
return end, nil
}
func (d *unmarshalJSONDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
return nil, 0, fmt.Errorf("json: unmarshal json decoder does not support decode path")
}
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