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459 lines
12 KiB
459 lines
12 KiB
package decoder
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import (
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"bytes"
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"encoding"
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"encoding/json"
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"reflect"
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"unsafe"
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"github.com/goccy/go-json/internal/errors"
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"github.com/goccy/go-json/internal/runtime"
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)
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type interfaceDecoder struct {
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typ *runtime.Type
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structName string
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fieldName string
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sliceDecoder *sliceDecoder
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mapDecoder *mapDecoder
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floatDecoder *floatDecoder
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numberDecoder *numberDecoder
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stringDecoder *stringDecoder
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}
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func newEmptyInterfaceDecoder(structName, fieldName string) *interfaceDecoder {
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ifaceDecoder := &interfaceDecoder{
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typ: emptyInterfaceType,
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structName: structName,
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fieldName: fieldName,
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floatDecoder: newFloatDecoder(structName, fieldName, func(p unsafe.Pointer, v float64) {
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*(*interface{})(p) = v
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}),
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numberDecoder: newNumberDecoder(structName, fieldName, func(p unsafe.Pointer, v json.Number) {
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*(*interface{})(p) = v
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}),
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stringDecoder: newStringDecoder(structName, fieldName),
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}
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ifaceDecoder.sliceDecoder = newSliceDecoder(
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ifaceDecoder,
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emptyInterfaceType,
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emptyInterfaceType.Size(),
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structName, fieldName,
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)
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ifaceDecoder.mapDecoder = newMapDecoder(
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interfaceMapType,
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stringType,
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ifaceDecoder.stringDecoder,
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interfaceMapType.Elem(),
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ifaceDecoder,
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structName,
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fieldName,
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)
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return ifaceDecoder
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}
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func newInterfaceDecoder(typ *runtime.Type, structName, fieldName string) *interfaceDecoder {
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emptyIfaceDecoder := newEmptyInterfaceDecoder(structName, fieldName)
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stringDecoder := newStringDecoder(structName, fieldName)
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return &interfaceDecoder{
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typ: typ,
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structName: structName,
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fieldName: fieldName,
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sliceDecoder: newSliceDecoder(
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emptyIfaceDecoder,
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emptyInterfaceType,
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emptyInterfaceType.Size(),
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structName, fieldName,
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),
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mapDecoder: newMapDecoder(
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interfaceMapType,
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stringType,
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stringDecoder,
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interfaceMapType.Elem(),
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emptyIfaceDecoder,
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structName,
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fieldName,
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),
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floatDecoder: newFloatDecoder(structName, fieldName, func(p unsafe.Pointer, v float64) {
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*(*interface{})(p) = v
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}),
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numberDecoder: newNumberDecoder(structName, fieldName, func(p unsafe.Pointer, v json.Number) {
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*(*interface{})(p) = v
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}),
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stringDecoder: stringDecoder,
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}
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}
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func (d *interfaceDecoder) numDecoder(s *Stream) Decoder {
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if s.UseNumber {
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return d.numberDecoder
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}
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return d.floatDecoder
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}
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var (
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emptyInterfaceType = runtime.Type2RType(reflect.TypeOf((*interface{})(nil)).Elem())
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interfaceMapType = runtime.Type2RType(
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reflect.TypeOf((*map[string]interface{})(nil)).Elem(),
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)
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stringType = runtime.Type2RType(
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reflect.TypeOf(""),
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)
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)
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func decodeStreamUnmarshaler(s *Stream, depth int64, unmarshaler json.Unmarshaler) error {
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start := s.cursor
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if err := s.skipValue(depth); 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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if err := unmarshaler.UnmarshalJSON(dst); err != nil {
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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 decodeStreamUnmarshalerContext(s *Stream, depth int64, unmarshaler unmarshalerContext) error {
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start := s.cursor
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if err := s.skipValue(depth); 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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if err := unmarshaler.UnmarshalJSON(s.Option.Context, dst); err != nil {
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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 decodeUnmarshaler(buf []byte, cursor, depth int64, unmarshaler json.Unmarshaler) (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, depth)
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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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dst := make([]byte, len(src))
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copy(dst, src)
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if err := unmarshaler.UnmarshalJSON(dst); err != nil {
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return 0, err
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}
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return end, nil
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}
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func decodeUnmarshalerContext(ctx *RuntimeContext, buf []byte, cursor, depth int64, unmarshaler unmarshalerContext) (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, depth)
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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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dst := make([]byte, len(src))
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copy(dst, src)
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if err := unmarshaler.UnmarshalJSON(ctx.Option.Context, dst); err != nil {
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return 0, err
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}
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return end, nil
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}
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func decodeStreamTextUnmarshaler(s *Stream, depth int64, unmarshaler encoding.TextUnmarshaler, p unsafe.Pointer) error {
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start := s.cursor
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if err := s.skipValue(depth); 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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if bytes.Equal(src, nullbytes) {
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*(*unsafe.Pointer)(p) = nil
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return nil
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}
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dst := make([]byte, len(src))
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copy(dst, src)
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if err := unmarshaler.UnmarshalText(dst); err != nil {
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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 decodeTextUnmarshaler(buf []byte, cursor, depth int64, unmarshaler encoding.TextUnmarshaler, 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, depth)
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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 bytes.Equal(src, nullbytes) {
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*(*unsafe.Pointer)(p) = nil
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return end, nil
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}
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if s, ok := unquoteBytes(src); ok {
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src = s
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}
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if err := unmarshaler.UnmarshalText(src); err != nil {
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return 0, err
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}
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return end, nil
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}
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func (d *interfaceDecoder) decodeStreamEmptyInterface(s *Stream, depth int64, p unsafe.Pointer) error {
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c := s.skipWhiteSpace()
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for {
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switch c {
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case '{':
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var v map[string]interface{}
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ptr := unsafe.Pointer(&v)
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if err := d.mapDecoder.DecodeStream(s, depth, ptr); err != nil {
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return err
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}
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*(*interface{})(p) = v
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return nil
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case '[':
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var v []interface{}
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ptr := unsafe.Pointer(&v)
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if err := d.sliceDecoder.DecodeStream(s, depth, ptr); err != nil {
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return err
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}
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*(*interface{})(p) = v
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return nil
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case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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return d.numDecoder(s).DecodeStream(s, depth, p)
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case '"':
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s.cursor++
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start := s.cursor
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for {
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switch s.char() {
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case '\\':
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if _, err := decodeEscapeString(s, nil); err != nil {
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return err
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}
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case '"':
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literal := s.buf[start:s.cursor]
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s.cursor++
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*(*interface{})(p) = string(literal)
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return nil
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case nul:
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if s.read() {
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continue
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}
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return errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
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}
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s.cursor++
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}
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case 't':
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if err := trueBytes(s); err != nil {
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return err
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}
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**(**interface{})(unsafe.Pointer(&p)) = true
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return nil
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case 'f':
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if err := falseBytes(s); err != nil {
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return err
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}
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**(**interface{})(unsafe.Pointer(&p)) = false
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return nil
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case 'n':
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if err := nullBytes(s); err != nil {
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return err
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}
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*(*interface{})(p) = nil
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return nil
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case nul:
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if s.read() {
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c = s.char()
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continue
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}
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}
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break
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}
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return errors.ErrInvalidBeginningOfValue(c, s.totalOffset())
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}
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type emptyInterface struct {
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typ *runtime.Type
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ptr unsafe.Pointer
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}
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func (d *interfaceDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
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runtimeInterfaceValue := *(*interface{})(unsafe.Pointer(&emptyInterface{
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typ: d.typ,
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ptr: p,
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}))
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rv := reflect.ValueOf(runtimeInterfaceValue)
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if rv.NumMethod() > 0 && rv.CanInterface() {
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if u, ok := rv.Interface().(unmarshalerContext); ok {
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return decodeStreamUnmarshalerContext(s, depth, u)
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}
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if u, ok := rv.Interface().(json.Unmarshaler); ok {
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return decodeStreamUnmarshaler(s, depth, u)
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}
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if u, ok := rv.Interface().(encoding.TextUnmarshaler); ok {
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return decodeStreamTextUnmarshaler(s, depth, u, p)
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}
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if s.skipWhiteSpace() == 'n' {
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if err := nullBytes(s); err != nil {
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return err
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}
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*(*interface{})(p) = nil
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return nil
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}
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return d.errUnmarshalType(rv.Type(), s.totalOffset())
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}
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iface := rv.Interface()
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ifaceHeader := (*emptyInterface)(unsafe.Pointer(&iface))
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typ := ifaceHeader.typ
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if ifaceHeader.ptr == nil || d.typ == typ || typ == nil {
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// concrete type is empty interface
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return d.decodeStreamEmptyInterface(s, depth, p)
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}
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if typ.Kind() == reflect.Ptr && typ.Elem() == d.typ || typ.Kind() != reflect.Ptr {
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return d.decodeStreamEmptyInterface(s, depth, p)
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}
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if s.skipWhiteSpace() == 'n' {
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if err := nullBytes(s); err != nil {
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return err
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}
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*(*interface{})(p) = nil
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return nil
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}
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decoder, err := CompileToGetDecoder(typ)
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if err != nil {
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return err
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}
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return decoder.DecodeStream(s, depth, ifaceHeader.ptr)
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}
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func (d *interfaceDecoder) errUnmarshalType(typ reflect.Type, offset int64) *errors.UnmarshalTypeError {
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return &errors.UnmarshalTypeError{
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Value: typ.String(),
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Type: typ,
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Offset: offset,
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Struct: d.structName,
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Field: d.fieldName,
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}
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}
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func (d *interfaceDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
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buf := ctx.Buf
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runtimeInterfaceValue := *(*interface{})(unsafe.Pointer(&emptyInterface{
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typ: d.typ,
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ptr: p,
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}))
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rv := reflect.ValueOf(runtimeInterfaceValue)
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if rv.NumMethod() > 0 && rv.CanInterface() {
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if u, ok := rv.Interface().(unmarshalerContext); ok {
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return decodeUnmarshalerContext(ctx, buf, cursor, depth, u)
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}
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if u, ok := rv.Interface().(json.Unmarshaler); ok {
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return decodeUnmarshaler(buf, cursor, depth, u)
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}
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if u, ok := rv.Interface().(encoding.TextUnmarshaler); ok {
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return decodeTextUnmarshaler(buf, cursor, depth, u, p)
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}
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] == 'n' {
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if err := validateNull(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 4
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**(**interface{})(unsafe.Pointer(&p)) = nil
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return cursor, nil
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}
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return 0, d.errUnmarshalType(rv.Type(), cursor)
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}
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iface := rv.Interface()
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ifaceHeader := (*emptyInterface)(unsafe.Pointer(&iface))
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typ := ifaceHeader.typ
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if ifaceHeader.ptr == nil || d.typ == typ || typ == nil {
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// concrete type is empty interface
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return d.decodeEmptyInterface(ctx, cursor, depth, p)
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}
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if typ.Kind() == reflect.Ptr && typ.Elem() == d.typ || typ.Kind() != reflect.Ptr {
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return d.decodeEmptyInterface(ctx, cursor, depth, p)
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}
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] == 'n' {
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if err := validateNull(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 4
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**(**interface{})(unsafe.Pointer(&p)) = nil
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return cursor, nil
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}
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decoder, err := CompileToGetDecoder(typ)
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if err != nil {
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return 0, err
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}
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return decoder.Decode(ctx, cursor, depth, ifaceHeader.ptr)
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}
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func (d *interfaceDecoder) decodeEmptyInterface(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
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buf := ctx.Buf
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cursor = skipWhiteSpace(buf, cursor)
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switch buf[cursor] {
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case '{':
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var v map[string]interface{}
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ptr := unsafe.Pointer(&v)
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cursor, err := d.mapDecoder.Decode(ctx, cursor, depth, ptr)
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if err != nil {
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return 0, err
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}
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**(**interface{})(unsafe.Pointer(&p)) = v
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return cursor, nil
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case '[':
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var v []interface{}
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ptr := unsafe.Pointer(&v)
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cursor, err := d.sliceDecoder.Decode(ctx, cursor, depth, ptr)
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if err != nil {
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return 0, err
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}
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**(**interface{})(unsafe.Pointer(&p)) = v
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return cursor, nil
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case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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return d.floatDecoder.Decode(ctx, cursor, depth, p)
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case '"':
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var v string
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ptr := unsafe.Pointer(&v)
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cursor, err := d.stringDecoder.Decode(ctx, cursor, depth, ptr)
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if err != nil {
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return 0, err
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}
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**(**interface{})(unsafe.Pointer(&p)) = v
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return cursor, nil
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case 't':
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if err := validateTrue(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 4
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**(**interface{})(unsafe.Pointer(&p)) = true
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return cursor, nil
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case 'f':
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if err := validateFalse(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 5
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**(**interface{})(unsafe.Pointer(&p)) = false
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return cursor, nil
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case 'n':
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if err := validateNull(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 4
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**(**interface{})(unsafe.Pointer(&p)) = nil
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return cursor, nil
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}
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return cursor, errors.ErrInvalidBeginningOfValue(buf[cursor], cursor)
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}
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