Matteo Scandolo | a428586 | 2020-12-01 18:10:10 -0800 | [diff] [blame^] | 1 | package jsoniter |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "github.com/modern-go/reflect2" |
| 7 | "io" |
| 8 | "reflect" |
| 9 | "strconv" |
| 10 | "unsafe" |
| 11 | ) |
| 12 | |
| 13 | // Any generic object representation. |
| 14 | // The lazy json implementation holds []byte and parse lazily. |
| 15 | type Any interface { |
| 16 | LastError() error |
| 17 | ValueType() ValueType |
| 18 | MustBeValid() Any |
| 19 | ToBool() bool |
| 20 | ToInt() int |
| 21 | ToInt32() int32 |
| 22 | ToInt64() int64 |
| 23 | ToUint() uint |
| 24 | ToUint32() uint32 |
| 25 | ToUint64() uint64 |
| 26 | ToFloat32() float32 |
| 27 | ToFloat64() float64 |
| 28 | ToString() string |
| 29 | ToVal(val interface{}) |
| 30 | Get(path ...interface{}) Any |
| 31 | Size() int |
| 32 | Keys() []string |
| 33 | GetInterface() interface{} |
| 34 | WriteTo(stream *Stream) |
| 35 | } |
| 36 | |
| 37 | type baseAny struct{} |
| 38 | |
| 39 | func (any *baseAny) Get(path ...interface{}) Any { |
| 40 | return &invalidAny{baseAny{}, fmt.Errorf("GetIndex %v from simple value", path)} |
| 41 | } |
| 42 | |
| 43 | func (any *baseAny) Size() int { |
| 44 | return 0 |
| 45 | } |
| 46 | |
| 47 | func (any *baseAny) Keys() []string { |
| 48 | return []string{} |
| 49 | } |
| 50 | |
| 51 | func (any *baseAny) ToVal(obj interface{}) { |
| 52 | panic("not implemented") |
| 53 | } |
| 54 | |
| 55 | // WrapInt32 turn int32 into Any interface |
| 56 | func WrapInt32(val int32) Any { |
| 57 | return &int32Any{baseAny{}, val} |
| 58 | } |
| 59 | |
| 60 | // WrapInt64 turn int64 into Any interface |
| 61 | func WrapInt64(val int64) Any { |
| 62 | return &int64Any{baseAny{}, val} |
| 63 | } |
| 64 | |
| 65 | // WrapUint32 turn uint32 into Any interface |
| 66 | func WrapUint32(val uint32) Any { |
| 67 | return &uint32Any{baseAny{}, val} |
| 68 | } |
| 69 | |
| 70 | // WrapUint64 turn uint64 into Any interface |
| 71 | func WrapUint64(val uint64) Any { |
| 72 | return &uint64Any{baseAny{}, val} |
| 73 | } |
| 74 | |
| 75 | // WrapFloat64 turn float64 into Any interface |
| 76 | func WrapFloat64(val float64) Any { |
| 77 | return &floatAny{baseAny{}, val} |
| 78 | } |
| 79 | |
| 80 | // WrapString turn string into Any interface |
| 81 | func WrapString(val string) Any { |
| 82 | return &stringAny{baseAny{}, val} |
| 83 | } |
| 84 | |
| 85 | // Wrap turn a go object into Any interface |
| 86 | func Wrap(val interface{}) Any { |
| 87 | if val == nil { |
| 88 | return &nilAny{} |
| 89 | } |
| 90 | asAny, isAny := val.(Any) |
| 91 | if isAny { |
| 92 | return asAny |
| 93 | } |
| 94 | typ := reflect2.TypeOf(val) |
| 95 | switch typ.Kind() { |
| 96 | case reflect.Slice: |
| 97 | return wrapArray(val) |
| 98 | case reflect.Struct: |
| 99 | return wrapStruct(val) |
| 100 | case reflect.Map: |
| 101 | return wrapMap(val) |
| 102 | case reflect.String: |
| 103 | return WrapString(val.(string)) |
| 104 | case reflect.Int: |
| 105 | if strconv.IntSize == 32 { |
| 106 | return WrapInt32(int32(val.(int))) |
| 107 | } |
| 108 | return WrapInt64(int64(val.(int))) |
| 109 | case reflect.Int8: |
| 110 | return WrapInt32(int32(val.(int8))) |
| 111 | case reflect.Int16: |
| 112 | return WrapInt32(int32(val.(int16))) |
| 113 | case reflect.Int32: |
| 114 | return WrapInt32(val.(int32)) |
| 115 | case reflect.Int64: |
| 116 | return WrapInt64(val.(int64)) |
| 117 | case reflect.Uint: |
| 118 | if strconv.IntSize == 32 { |
| 119 | return WrapUint32(uint32(val.(uint))) |
| 120 | } |
| 121 | return WrapUint64(uint64(val.(uint))) |
| 122 | case reflect.Uintptr: |
| 123 | if ptrSize == 32 { |
| 124 | return WrapUint32(uint32(val.(uintptr))) |
| 125 | } |
| 126 | return WrapUint64(uint64(val.(uintptr))) |
| 127 | case reflect.Uint8: |
| 128 | return WrapUint32(uint32(val.(uint8))) |
| 129 | case reflect.Uint16: |
| 130 | return WrapUint32(uint32(val.(uint16))) |
| 131 | case reflect.Uint32: |
| 132 | return WrapUint32(uint32(val.(uint32))) |
| 133 | case reflect.Uint64: |
| 134 | return WrapUint64(val.(uint64)) |
| 135 | case reflect.Float32: |
| 136 | return WrapFloat64(float64(val.(float32))) |
| 137 | case reflect.Float64: |
| 138 | return WrapFloat64(val.(float64)) |
| 139 | case reflect.Bool: |
| 140 | if val.(bool) == true { |
| 141 | return &trueAny{} |
| 142 | } |
| 143 | return &falseAny{} |
| 144 | } |
| 145 | return &invalidAny{baseAny{}, fmt.Errorf("unsupported type: %v", typ)} |
| 146 | } |
| 147 | |
| 148 | // ReadAny read next JSON element as an Any object. It is a better json.RawMessage. |
| 149 | func (iter *Iterator) ReadAny() Any { |
| 150 | return iter.readAny() |
| 151 | } |
| 152 | |
| 153 | func (iter *Iterator) readAny() Any { |
| 154 | c := iter.nextToken() |
| 155 | switch c { |
| 156 | case '"': |
| 157 | iter.unreadByte() |
| 158 | return &stringAny{baseAny{}, iter.ReadString()} |
| 159 | case 'n': |
| 160 | iter.skipThreeBytes('u', 'l', 'l') // null |
| 161 | return &nilAny{} |
| 162 | case 't': |
| 163 | iter.skipThreeBytes('r', 'u', 'e') // true |
| 164 | return &trueAny{} |
| 165 | case 'f': |
| 166 | iter.skipFourBytes('a', 'l', 's', 'e') // false |
| 167 | return &falseAny{} |
| 168 | case '{': |
| 169 | return iter.readObjectAny() |
| 170 | case '[': |
| 171 | return iter.readArrayAny() |
| 172 | case '-': |
| 173 | return iter.readNumberAny(false) |
| 174 | case 0: |
| 175 | return &invalidAny{baseAny{}, errors.New("input is empty")} |
| 176 | default: |
| 177 | return iter.readNumberAny(true) |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | func (iter *Iterator) readNumberAny(positive bool) Any { |
| 182 | iter.startCapture(iter.head - 1) |
| 183 | iter.skipNumber() |
| 184 | lazyBuf := iter.stopCapture() |
| 185 | return &numberLazyAny{baseAny{}, iter.cfg, lazyBuf, nil} |
| 186 | } |
| 187 | |
| 188 | func (iter *Iterator) readObjectAny() Any { |
| 189 | iter.startCapture(iter.head - 1) |
| 190 | iter.skipObject() |
| 191 | lazyBuf := iter.stopCapture() |
| 192 | return &objectLazyAny{baseAny{}, iter.cfg, lazyBuf, nil} |
| 193 | } |
| 194 | |
| 195 | func (iter *Iterator) readArrayAny() Any { |
| 196 | iter.startCapture(iter.head - 1) |
| 197 | iter.skipArray() |
| 198 | lazyBuf := iter.stopCapture() |
| 199 | return &arrayLazyAny{baseAny{}, iter.cfg, lazyBuf, nil} |
| 200 | } |
| 201 | |
| 202 | func locateObjectField(iter *Iterator, target string) []byte { |
| 203 | var found []byte |
| 204 | iter.ReadObjectCB(func(iter *Iterator, field string) bool { |
| 205 | if field == target { |
| 206 | found = iter.SkipAndReturnBytes() |
| 207 | return false |
| 208 | } |
| 209 | iter.Skip() |
| 210 | return true |
| 211 | }) |
| 212 | return found |
| 213 | } |
| 214 | |
| 215 | func locateArrayElement(iter *Iterator, target int) []byte { |
| 216 | var found []byte |
| 217 | n := 0 |
| 218 | iter.ReadArrayCB(func(iter *Iterator) bool { |
| 219 | if n == target { |
| 220 | found = iter.SkipAndReturnBytes() |
| 221 | return false |
| 222 | } |
| 223 | iter.Skip() |
| 224 | n++ |
| 225 | return true |
| 226 | }) |
| 227 | return found |
| 228 | } |
| 229 | |
| 230 | func locatePath(iter *Iterator, path []interface{}) Any { |
| 231 | for i, pathKeyObj := range path { |
| 232 | switch pathKey := pathKeyObj.(type) { |
| 233 | case string: |
| 234 | valueBytes := locateObjectField(iter, pathKey) |
| 235 | if valueBytes == nil { |
| 236 | return newInvalidAny(path[i:]) |
| 237 | } |
| 238 | iter.ResetBytes(valueBytes) |
| 239 | case int: |
| 240 | valueBytes := locateArrayElement(iter, pathKey) |
| 241 | if valueBytes == nil { |
| 242 | return newInvalidAny(path[i:]) |
| 243 | } |
| 244 | iter.ResetBytes(valueBytes) |
| 245 | case int32: |
| 246 | if '*' == pathKey { |
| 247 | return iter.readAny().Get(path[i:]...) |
| 248 | } |
| 249 | return newInvalidAny(path[i:]) |
| 250 | default: |
| 251 | return newInvalidAny(path[i:]) |
| 252 | } |
| 253 | } |
| 254 | if iter.Error != nil && iter.Error != io.EOF { |
| 255 | return &invalidAny{baseAny{}, iter.Error} |
| 256 | } |
| 257 | return iter.readAny() |
| 258 | } |
| 259 | |
| 260 | var anyType = reflect2.TypeOfPtr((*Any)(nil)).Elem() |
| 261 | |
| 262 | func createDecoderOfAny(ctx *ctx, typ reflect2.Type) ValDecoder { |
| 263 | if typ == anyType { |
| 264 | return &directAnyCodec{} |
| 265 | } |
| 266 | if typ.Implements(anyType) { |
| 267 | return &anyCodec{ |
| 268 | valType: typ, |
| 269 | } |
| 270 | } |
| 271 | return nil |
| 272 | } |
| 273 | |
| 274 | func createEncoderOfAny(ctx *ctx, typ reflect2.Type) ValEncoder { |
| 275 | if typ == anyType { |
| 276 | return &directAnyCodec{} |
| 277 | } |
| 278 | if typ.Implements(anyType) { |
| 279 | return &anyCodec{ |
| 280 | valType: typ, |
| 281 | } |
| 282 | } |
| 283 | return nil |
| 284 | } |
| 285 | |
| 286 | type anyCodec struct { |
| 287 | valType reflect2.Type |
| 288 | } |
| 289 | |
| 290 | func (codec *anyCodec) Decode(ptr unsafe.Pointer, iter *Iterator) { |
| 291 | panic("not implemented") |
| 292 | } |
| 293 | |
| 294 | func (codec *anyCodec) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 295 | obj := codec.valType.UnsafeIndirect(ptr) |
| 296 | any := obj.(Any) |
| 297 | any.WriteTo(stream) |
| 298 | } |
| 299 | |
| 300 | func (codec *anyCodec) IsEmpty(ptr unsafe.Pointer) bool { |
| 301 | obj := codec.valType.UnsafeIndirect(ptr) |
| 302 | any := obj.(Any) |
| 303 | return any.Size() == 0 |
| 304 | } |
| 305 | |
| 306 | type directAnyCodec struct { |
| 307 | } |
| 308 | |
| 309 | func (codec *directAnyCodec) Decode(ptr unsafe.Pointer, iter *Iterator) { |
| 310 | *(*Any)(ptr) = iter.readAny() |
| 311 | } |
| 312 | |
| 313 | func (codec *directAnyCodec) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 314 | any := *(*Any)(ptr) |
| 315 | if any == nil { |
| 316 | stream.WriteNil() |
| 317 | return |
| 318 | } |
| 319 | any.WriteTo(stream) |
| 320 | } |
| 321 | |
| 322 | func (codec *directAnyCodec) IsEmpty(ptr unsafe.Pointer) bool { |
| 323 | any := *(*Any)(ptr) |
| 324 | return any.Size() == 0 |
| 325 | } |