Scott Baker | e7144bc | 2019-10-01 14:16:47 -0700 | [diff] [blame^] | 1 | package jsoniter |
| 2 | |
| 3 | import ( |
| 4 | "encoding" |
| 5 | "encoding/json" |
| 6 | "github.com/modern-go/reflect2" |
| 7 | "unsafe" |
| 8 | ) |
| 9 | |
| 10 | var marshalerType = reflect2.TypeOfPtr((*json.Marshaler)(nil)).Elem() |
| 11 | var unmarshalerType = reflect2.TypeOfPtr((*json.Unmarshaler)(nil)).Elem() |
| 12 | var textMarshalerType = reflect2.TypeOfPtr((*encoding.TextMarshaler)(nil)).Elem() |
| 13 | var textUnmarshalerType = reflect2.TypeOfPtr((*encoding.TextUnmarshaler)(nil)).Elem() |
| 14 | |
| 15 | func createDecoderOfMarshaler(ctx *ctx, typ reflect2.Type) ValDecoder { |
| 16 | ptrType := reflect2.PtrTo(typ) |
| 17 | if ptrType.Implements(unmarshalerType) { |
| 18 | return &referenceDecoder{ |
| 19 | &unmarshalerDecoder{ptrType}, |
| 20 | } |
| 21 | } |
| 22 | if ptrType.Implements(textUnmarshalerType) { |
| 23 | return &referenceDecoder{ |
| 24 | &textUnmarshalerDecoder{ptrType}, |
| 25 | } |
| 26 | } |
| 27 | return nil |
| 28 | } |
| 29 | |
| 30 | func createEncoderOfMarshaler(ctx *ctx, typ reflect2.Type) ValEncoder { |
| 31 | if typ == marshalerType { |
| 32 | checkIsEmpty := createCheckIsEmpty(ctx, typ) |
| 33 | var encoder ValEncoder = &directMarshalerEncoder{ |
| 34 | checkIsEmpty: checkIsEmpty, |
| 35 | } |
| 36 | return encoder |
| 37 | } |
| 38 | if typ.Implements(marshalerType) { |
| 39 | checkIsEmpty := createCheckIsEmpty(ctx, typ) |
| 40 | var encoder ValEncoder = &marshalerEncoder{ |
| 41 | valType: typ, |
| 42 | checkIsEmpty: checkIsEmpty, |
| 43 | } |
| 44 | return encoder |
| 45 | } |
| 46 | ptrType := reflect2.PtrTo(typ) |
| 47 | if ctx.prefix != "" && ptrType.Implements(marshalerType) { |
| 48 | checkIsEmpty := createCheckIsEmpty(ctx, ptrType) |
| 49 | var encoder ValEncoder = &marshalerEncoder{ |
| 50 | valType: ptrType, |
| 51 | checkIsEmpty: checkIsEmpty, |
| 52 | } |
| 53 | return &referenceEncoder{encoder} |
| 54 | } |
| 55 | if typ == textMarshalerType { |
| 56 | checkIsEmpty := createCheckIsEmpty(ctx, typ) |
| 57 | var encoder ValEncoder = &directTextMarshalerEncoder{ |
| 58 | checkIsEmpty: checkIsEmpty, |
| 59 | stringEncoder: ctx.EncoderOf(reflect2.TypeOf("")), |
| 60 | } |
| 61 | return encoder |
| 62 | } |
| 63 | if typ.Implements(textMarshalerType) { |
| 64 | checkIsEmpty := createCheckIsEmpty(ctx, typ) |
| 65 | var encoder ValEncoder = &textMarshalerEncoder{ |
| 66 | valType: typ, |
| 67 | stringEncoder: ctx.EncoderOf(reflect2.TypeOf("")), |
| 68 | checkIsEmpty: checkIsEmpty, |
| 69 | } |
| 70 | return encoder |
| 71 | } |
| 72 | // if prefix is empty, the type is the root type |
| 73 | if ctx.prefix != "" && ptrType.Implements(textMarshalerType) { |
| 74 | checkIsEmpty := createCheckIsEmpty(ctx, ptrType) |
| 75 | var encoder ValEncoder = &textMarshalerEncoder{ |
| 76 | valType: ptrType, |
| 77 | stringEncoder: ctx.EncoderOf(reflect2.TypeOf("")), |
| 78 | checkIsEmpty: checkIsEmpty, |
| 79 | } |
| 80 | return &referenceEncoder{encoder} |
| 81 | } |
| 82 | return nil |
| 83 | } |
| 84 | |
| 85 | type marshalerEncoder struct { |
| 86 | checkIsEmpty checkIsEmpty |
| 87 | valType reflect2.Type |
| 88 | } |
| 89 | |
| 90 | func (encoder *marshalerEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 91 | obj := encoder.valType.UnsafeIndirect(ptr) |
| 92 | if encoder.valType.IsNullable() && reflect2.IsNil(obj) { |
| 93 | stream.WriteNil() |
| 94 | return |
| 95 | } |
| 96 | bytes, err := json.Marshal(obj) |
| 97 | if err != nil { |
| 98 | stream.Error = err |
| 99 | } else { |
| 100 | stream.Write(bytes) |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | func (encoder *marshalerEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 105 | return encoder.checkIsEmpty.IsEmpty(ptr) |
| 106 | } |
| 107 | |
| 108 | type directMarshalerEncoder struct { |
| 109 | checkIsEmpty checkIsEmpty |
| 110 | } |
| 111 | |
| 112 | func (encoder *directMarshalerEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 113 | marshaler := *(*json.Marshaler)(ptr) |
| 114 | if marshaler == nil { |
| 115 | stream.WriteNil() |
| 116 | return |
| 117 | } |
| 118 | bytes, err := marshaler.MarshalJSON() |
| 119 | if err != nil { |
| 120 | stream.Error = err |
| 121 | } else { |
| 122 | stream.Write(bytes) |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | func (encoder *directMarshalerEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 127 | return encoder.checkIsEmpty.IsEmpty(ptr) |
| 128 | } |
| 129 | |
| 130 | type textMarshalerEncoder struct { |
| 131 | valType reflect2.Type |
| 132 | stringEncoder ValEncoder |
| 133 | checkIsEmpty checkIsEmpty |
| 134 | } |
| 135 | |
| 136 | func (encoder *textMarshalerEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 137 | obj := encoder.valType.UnsafeIndirect(ptr) |
| 138 | if encoder.valType.IsNullable() && reflect2.IsNil(obj) { |
| 139 | stream.WriteNil() |
| 140 | return |
| 141 | } |
| 142 | marshaler := (obj).(encoding.TextMarshaler) |
| 143 | bytes, err := marshaler.MarshalText() |
| 144 | if err != nil { |
| 145 | stream.Error = err |
| 146 | } else { |
| 147 | str := string(bytes) |
| 148 | encoder.stringEncoder.Encode(unsafe.Pointer(&str), stream) |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | func (encoder *textMarshalerEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 153 | return encoder.checkIsEmpty.IsEmpty(ptr) |
| 154 | } |
| 155 | |
| 156 | type directTextMarshalerEncoder struct { |
| 157 | stringEncoder ValEncoder |
| 158 | checkIsEmpty checkIsEmpty |
| 159 | } |
| 160 | |
| 161 | func (encoder *directTextMarshalerEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 162 | marshaler := *(*encoding.TextMarshaler)(ptr) |
| 163 | if marshaler == nil { |
| 164 | stream.WriteNil() |
| 165 | return |
| 166 | } |
| 167 | bytes, err := marshaler.MarshalText() |
| 168 | if err != nil { |
| 169 | stream.Error = err |
| 170 | } else { |
| 171 | str := string(bytes) |
| 172 | encoder.stringEncoder.Encode(unsafe.Pointer(&str), stream) |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | func (encoder *directTextMarshalerEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 177 | return encoder.checkIsEmpty.IsEmpty(ptr) |
| 178 | } |
| 179 | |
| 180 | type unmarshalerDecoder struct { |
| 181 | valType reflect2.Type |
| 182 | } |
| 183 | |
| 184 | func (decoder *unmarshalerDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) { |
| 185 | valType := decoder.valType |
| 186 | obj := valType.UnsafeIndirect(ptr) |
| 187 | unmarshaler := obj.(json.Unmarshaler) |
| 188 | iter.nextToken() |
| 189 | iter.unreadByte() // skip spaces |
| 190 | bytes := iter.SkipAndReturnBytes() |
| 191 | err := unmarshaler.UnmarshalJSON(bytes) |
| 192 | if err != nil { |
| 193 | iter.ReportError("unmarshalerDecoder", err.Error()) |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | type textUnmarshalerDecoder struct { |
| 198 | valType reflect2.Type |
| 199 | } |
| 200 | |
| 201 | func (decoder *textUnmarshalerDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) { |
| 202 | valType := decoder.valType |
| 203 | obj := valType.UnsafeIndirect(ptr) |
| 204 | if reflect2.IsNil(obj) { |
| 205 | ptrType := valType.(*reflect2.UnsafePtrType) |
| 206 | elemType := ptrType.Elem() |
| 207 | elem := elemType.UnsafeNew() |
| 208 | ptrType.UnsafeSet(ptr, unsafe.Pointer(&elem)) |
| 209 | obj = valType.UnsafeIndirect(ptr) |
| 210 | } |
| 211 | unmarshaler := (obj).(encoding.TextUnmarshaler) |
| 212 | str := iter.ReadString() |
| 213 | err := unmarshaler.UnmarshalText([]byte(str)) |
| 214 | if err != nil { |
| 215 | iter.ReportError("textUnmarshalerDecoder", err.Error()) |
| 216 | } |
| 217 | } |