David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2009 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package xml |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "encoding" |
| 10 | "errors" |
| 11 | "fmt" |
| 12 | "reflect" |
| 13 | "strconv" |
| 14 | "strings" |
| 15 | ) |
| 16 | |
| 17 | // BUG(rsc): Mapping between XML elements and data structures is inherently flawed: |
| 18 | // an XML element is an order-dependent collection of anonymous |
| 19 | // values, while a data structure is an order-independent collection |
| 20 | // of named values. |
| 21 | // See package json for a textual representation more suitable |
| 22 | // to data structures. |
| 23 | |
| 24 | // Unmarshal parses the XML-encoded data and stores the result in |
| 25 | // the value pointed to by v, which must be an arbitrary struct, |
| 26 | // slice, or string. Well-formed data that does not fit into v is |
| 27 | // discarded. |
| 28 | // |
| 29 | // Because Unmarshal uses the reflect package, it can only assign |
| 30 | // to exported (upper case) fields. Unmarshal uses a case-sensitive |
| 31 | // comparison to match XML element names to tag values and struct |
| 32 | // field names. |
| 33 | // |
| 34 | // Unmarshal maps an XML element to a struct using the following rules. |
| 35 | // In the rules, the tag of a field refers to the value associated with the |
| 36 | // key 'xml' in the struct field's tag (see the example above). |
| 37 | // |
| 38 | // * If the struct has a field of type []byte or string with tag |
| 39 | // ",innerxml", Unmarshal accumulates the raw XML nested inside the |
| 40 | // element in that field. The rest of the rules still apply. |
| 41 | // |
| 42 | // * If the struct has a field named XMLName of type xml.Name, |
| 43 | // Unmarshal records the element name in that field. |
| 44 | // |
| 45 | // * If the XMLName field has an associated tag of the form |
| 46 | // "name" or "namespace-URL name", the XML element must have |
| 47 | // the given name (and, optionally, name space) or else Unmarshal |
| 48 | // returns an error. |
| 49 | // |
| 50 | // * If the XML element has an attribute whose name matches a |
| 51 | // struct field name with an associated tag containing ",attr" or |
| 52 | // the explicit name in a struct field tag of the form "name,attr", |
| 53 | // Unmarshal records the attribute value in that field. |
| 54 | // |
| 55 | // * If the XML element contains character data, that data is |
| 56 | // accumulated in the first struct field that has tag ",chardata". |
| 57 | // The struct field may have type []byte or string. |
| 58 | // If there is no such field, the character data is discarded. |
| 59 | // |
| 60 | // * If the XML element contains comments, they are accumulated in |
| 61 | // the first struct field that has tag ",comment". The struct |
| 62 | // field may have type []byte or string. If there is no such |
| 63 | // field, the comments are discarded. |
| 64 | // |
| 65 | // * If the XML element contains a sub-element whose name matches |
| 66 | // the prefix of a tag formatted as "a" or "a>b>c", unmarshal |
| 67 | // will descend into the XML structure looking for elements with the |
| 68 | // given names, and will map the innermost elements to that struct |
| 69 | // field. A tag starting with ">" is equivalent to one starting |
| 70 | // with the field name followed by ">". |
| 71 | // |
| 72 | // * If the XML element contains a sub-element whose name matches |
| 73 | // a struct field's XMLName tag and the struct field has no |
| 74 | // explicit name tag as per the previous rule, unmarshal maps |
| 75 | // the sub-element to that struct field. |
| 76 | // |
| 77 | // * If the XML element contains a sub-element whose name matches a |
| 78 | // field without any mode flags (",attr", ",chardata", etc), Unmarshal |
| 79 | // maps the sub-element to that struct field. |
| 80 | // |
| 81 | // * If the XML element contains a sub-element that hasn't matched any |
| 82 | // of the above rules and the struct has a field with tag ",any", |
| 83 | // unmarshal maps the sub-element to that struct field. |
| 84 | // |
| 85 | // * An anonymous struct field is handled as if the fields of its |
| 86 | // value were part of the outer struct. |
| 87 | // |
| 88 | // * A struct field with tag "-" is never unmarshalled into. |
| 89 | // |
| 90 | // Unmarshal maps an XML element to a string or []byte by saving the |
| 91 | // concatenation of that element's character data in the string or |
| 92 | // []byte. The saved []byte is never nil. |
| 93 | // |
| 94 | // Unmarshal maps an attribute value to a string or []byte by saving |
| 95 | // the value in the string or slice. |
| 96 | // |
| 97 | // Unmarshal maps an XML element to a slice by extending the length of |
| 98 | // the slice and mapping the element to the newly created value. |
| 99 | // |
| 100 | // Unmarshal maps an XML element or attribute value to a bool by |
| 101 | // setting it to the boolean value represented by the string. |
| 102 | // |
| 103 | // Unmarshal maps an XML element or attribute value to an integer or |
| 104 | // floating-point field by setting the field to the result of |
| 105 | // interpreting the string value in decimal. There is no check for |
| 106 | // overflow. |
| 107 | // |
| 108 | // Unmarshal maps an XML element to an xml.Name by recording the |
| 109 | // element name. |
| 110 | // |
| 111 | // Unmarshal maps an XML element to a pointer by setting the pointer |
| 112 | // to a freshly allocated value and then mapping the element to that value. |
| 113 | // |
| 114 | func Unmarshal(data []byte, v interface{}) error { |
| 115 | return NewDecoder(bytes.NewReader(data)).Decode(v) |
| 116 | } |
| 117 | |
| 118 | // Decode works like xml.Unmarshal, except it reads the decoder |
| 119 | // stream to find the start element. |
| 120 | func (d *Decoder) Decode(v interface{}) error { |
| 121 | return d.DecodeElement(v, nil) |
| 122 | } |
| 123 | |
| 124 | // DecodeElement works like xml.Unmarshal except that it takes |
| 125 | // a pointer to the start XML element to decode into v. |
| 126 | // It is useful when a client reads some raw XML tokens itself |
| 127 | // but also wants to defer to Unmarshal for some elements. |
| 128 | func (d *Decoder) DecodeElement(v interface{}, start *StartElement) error { |
| 129 | val := reflect.ValueOf(v) |
| 130 | if val.Kind() != reflect.Ptr { |
| 131 | return errors.New("non-pointer passed to Unmarshal") |
| 132 | } |
| 133 | return d.unmarshal(val.Elem(), start) |
| 134 | } |
| 135 | |
| 136 | // An UnmarshalError represents an error in the unmarshalling process. |
| 137 | type UnmarshalError string |
| 138 | |
| 139 | func (e UnmarshalError) Error() string { return string(e) } |
| 140 | |
| 141 | // Unmarshaler is the interface implemented by objects that can unmarshal |
| 142 | // an XML element description of themselves. |
| 143 | // |
| 144 | // UnmarshalXML decodes a single XML element |
| 145 | // beginning with the given start element. |
| 146 | // If it returns an error, the outer call to Unmarshal stops and |
| 147 | // returns that error. |
| 148 | // UnmarshalXML must consume exactly one XML element. |
| 149 | // One common implementation strategy is to unmarshal into |
| 150 | // a separate value with a layout matching the expected XML |
| 151 | // using d.DecodeElement, and then to copy the data from |
| 152 | // that value into the receiver. |
| 153 | // Another common strategy is to use d.Token to process the |
| 154 | // XML object one token at a time. |
| 155 | // UnmarshalXML may not use d.RawToken. |
| 156 | type Unmarshaler interface { |
| 157 | UnmarshalXML(d *Decoder, start StartElement) error |
| 158 | } |
| 159 | |
| 160 | // UnmarshalerAttr is the interface implemented by objects that can unmarshal |
| 161 | // an XML attribute description of themselves. |
| 162 | // |
| 163 | // UnmarshalXMLAttr decodes a single XML attribute. |
| 164 | // If it returns an error, the outer call to Unmarshal stops and |
| 165 | // returns that error. |
| 166 | // UnmarshalXMLAttr is used only for struct fields with the |
| 167 | // "attr" option in the field tag. |
| 168 | type UnmarshalerAttr interface { |
| 169 | UnmarshalXMLAttr(attr Attr) error |
| 170 | } |
| 171 | |
| 172 | // receiverType returns the receiver type to use in an expression like "%s.MethodName". |
| 173 | func receiverType(val interface{}) string { |
| 174 | t := reflect.TypeOf(val) |
| 175 | if t.Name() != "" { |
| 176 | return t.String() |
| 177 | } |
| 178 | return "(" + t.String() + ")" |
| 179 | } |
| 180 | |
| 181 | // unmarshalInterface unmarshals a single XML element into val. |
| 182 | // start is the opening tag of the element. |
| 183 | func (p *Decoder) unmarshalInterface(val Unmarshaler, start *StartElement) error { |
| 184 | // Record that decoder must stop at end tag corresponding to start. |
| 185 | p.pushEOF() |
| 186 | |
| 187 | p.unmarshalDepth++ |
| 188 | err := val.UnmarshalXML(p, *start) |
| 189 | p.unmarshalDepth-- |
| 190 | if err != nil { |
| 191 | p.popEOF() |
| 192 | return err |
| 193 | } |
| 194 | |
| 195 | if !p.popEOF() { |
| 196 | return fmt.Errorf("xml: %s.UnmarshalXML did not consume entire <%s> element", receiverType(val), start.Name.Local) |
| 197 | } |
| 198 | |
| 199 | return nil |
| 200 | } |
| 201 | |
| 202 | // unmarshalTextInterface unmarshals a single XML element into val. |
| 203 | // The chardata contained in the element (but not its children) |
| 204 | // is passed to the text unmarshaler. |
| 205 | func (p *Decoder) unmarshalTextInterface(val encoding.TextUnmarshaler, start *StartElement) error { |
| 206 | var buf []byte |
| 207 | depth := 1 |
| 208 | for depth > 0 { |
| 209 | t, err := p.Token() |
| 210 | if err != nil { |
| 211 | return err |
| 212 | } |
| 213 | switch t := t.(type) { |
| 214 | case CharData: |
| 215 | if depth == 1 { |
| 216 | buf = append(buf, t...) |
| 217 | } |
| 218 | case StartElement: |
| 219 | depth++ |
| 220 | case EndElement: |
| 221 | depth-- |
| 222 | } |
| 223 | } |
| 224 | return val.UnmarshalText(buf) |
| 225 | } |
| 226 | |
| 227 | // unmarshalAttr unmarshals a single XML attribute into val. |
| 228 | func (p *Decoder) unmarshalAttr(val reflect.Value, attr Attr) error { |
| 229 | if val.Kind() == reflect.Ptr { |
| 230 | if val.IsNil() { |
| 231 | val.Set(reflect.New(val.Type().Elem())) |
| 232 | } |
| 233 | val = val.Elem() |
| 234 | } |
| 235 | |
| 236 | if val.CanInterface() && val.Type().Implements(unmarshalerAttrType) { |
| 237 | // This is an unmarshaler with a non-pointer receiver, |
| 238 | // so it's likely to be incorrect, but we do what we're told. |
| 239 | return val.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr) |
| 240 | } |
| 241 | if val.CanAddr() { |
| 242 | pv := val.Addr() |
| 243 | if pv.CanInterface() && pv.Type().Implements(unmarshalerAttrType) { |
| 244 | return pv.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr) |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | // Not an UnmarshalerAttr; try encoding.TextUnmarshaler. |
| 249 | if val.CanInterface() && val.Type().Implements(textUnmarshalerType) { |
| 250 | // This is an unmarshaler with a non-pointer receiver, |
| 251 | // so it's likely to be incorrect, but we do what we're told. |
| 252 | return val.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value)) |
| 253 | } |
| 254 | if val.CanAddr() { |
| 255 | pv := val.Addr() |
| 256 | if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) { |
| 257 | return pv.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value)) |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | copyValue(val, []byte(attr.Value)) |
| 262 | return nil |
| 263 | } |
| 264 | |
| 265 | var ( |
| 266 | unmarshalerType = reflect.TypeOf((*Unmarshaler)(nil)).Elem() |
| 267 | unmarshalerAttrType = reflect.TypeOf((*UnmarshalerAttr)(nil)).Elem() |
| 268 | textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem() |
| 269 | ) |
| 270 | |
| 271 | // Unmarshal a single XML element into val. |
| 272 | func (p *Decoder) unmarshal(val reflect.Value, start *StartElement) error { |
| 273 | // Find start element if we need it. |
| 274 | if start == nil { |
| 275 | for { |
| 276 | tok, err := p.Token() |
| 277 | if err != nil { |
| 278 | return err |
| 279 | } |
| 280 | if t, ok := tok.(StartElement); ok { |
| 281 | start = &t |
| 282 | break |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | // Load value from interface, but only if the result will be |
| 288 | // usefully addressable. |
| 289 | if val.Kind() == reflect.Interface && !val.IsNil() { |
| 290 | e := val.Elem() |
| 291 | if e.Kind() == reflect.Ptr && !e.IsNil() { |
| 292 | val = e |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | if val.Kind() == reflect.Ptr { |
| 297 | if val.IsNil() { |
| 298 | val.Set(reflect.New(val.Type().Elem())) |
| 299 | } |
| 300 | val = val.Elem() |
| 301 | } |
| 302 | |
| 303 | if val.CanInterface() && val.Type().Implements(unmarshalerType) { |
| 304 | // This is an unmarshaler with a non-pointer receiver, |
| 305 | // so it's likely to be incorrect, but we do what we're told. |
| 306 | return p.unmarshalInterface(val.Interface().(Unmarshaler), start) |
| 307 | } |
| 308 | |
| 309 | if val.CanAddr() { |
| 310 | pv := val.Addr() |
| 311 | if pv.CanInterface() && pv.Type().Implements(unmarshalerType) { |
| 312 | return p.unmarshalInterface(pv.Interface().(Unmarshaler), start) |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | if val.CanInterface() && val.Type().Implements(textUnmarshalerType) { |
| 317 | return p.unmarshalTextInterface(val.Interface().(encoding.TextUnmarshaler), start) |
| 318 | } |
| 319 | |
| 320 | if val.CanAddr() { |
| 321 | pv := val.Addr() |
| 322 | if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) { |
| 323 | return p.unmarshalTextInterface(pv.Interface().(encoding.TextUnmarshaler), start) |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | var ( |
| 328 | data []byte |
| 329 | saveData reflect.Value |
| 330 | comment []byte |
| 331 | saveComment reflect.Value |
| 332 | saveXML reflect.Value |
| 333 | saveXMLIndex int |
| 334 | saveXMLData []byte |
| 335 | saveAny reflect.Value |
| 336 | sv reflect.Value |
| 337 | tinfo *typeInfo |
| 338 | err error |
| 339 | ) |
| 340 | |
| 341 | switch v := val; v.Kind() { |
| 342 | default: |
| 343 | return errors.New("unknown type " + v.Type().String()) |
| 344 | |
| 345 | case reflect.Interface: |
| 346 | // TODO: For now, simply ignore the field. In the near |
| 347 | // future we may choose to unmarshal the start |
| 348 | // element on it, if not nil. |
| 349 | return p.Skip() |
| 350 | |
| 351 | case reflect.Slice: |
| 352 | typ := v.Type() |
| 353 | if typ.Elem().Kind() == reflect.Uint8 { |
| 354 | // []byte |
| 355 | saveData = v |
| 356 | break |
| 357 | } |
| 358 | |
| 359 | // Slice of element values. |
| 360 | // Grow slice. |
| 361 | n := v.Len() |
| 362 | if n >= v.Cap() { |
| 363 | ncap := 2 * n |
| 364 | if ncap < 4 { |
| 365 | ncap = 4 |
| 366 | } |
| 367 | new := reflect.MakeSlice(typ, n, ncap) |
| 368 | reflect.Copy(new, v) |
| 369 | v.Set(new) |
| 370 | } |
| 371 | v.SetLen(n + 1) |
| 372 | |
| 373 | // Recur to read element into slice. |
| 374 | if err := p.unmarshal(v.Index(n), start); err != nil { |
| 375 | v.SetLen(n) |
| 376 | return err |
| 377 | } |
| 378 | return nil |
| 379 | |
| 380 | case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr, reflect.String: |
| 381 | saveData = v |
| 382 | |
| 383 | case reflect.Struct: |
| 384 | typ := v.Type() |
| 385 | if typ == nameType { |
| 386 | v.Set(reflect.ValueOf(start.Name)) |
| 387 | break |
| 388 | } |
| 389 | |
| 390 | sv = v |
| 391 | tinfo, err = getTypeInfo(typ) |
| 392 | if err != nil { |
| 393 | return err |
| 394 | } |
| 395 | |
| 396 | // Validate and assign element name. |
| 397 | if tinfo.xmlname != nil { |
| 398 | finfo := tinfo.xmlname |
| 399 | if finfo.name != "" && finfo.name != start.Name.Local { |
| 400 | return UnmarshalError("expected element type <" + finfo.name + "> but have <" + start.Name.Local + ">") |
| 401 | } |
| 402 | if finfo.xmlns != "" && finfo.xmlns != start.Name.Space { |
| 403 | e := "expected element <" + finfo.name + "> in name space " + finfo.xmlns + " but have " |
| 404 | if start.Name.Space == "" { |
| 405 | e += "no name space" |
| 406 | } else { |
| 407 | e += start.Name.Space |
| 408 | } |
| 409 | return UnmarshalError(e) |
| 410 | } |
| 411 | fv := finfo.value(sv) |
| 412 | if _, ok := fv.Interface().(Name); ok { |
| 413 | fv.Set(reflect.ValueOf(start.Name)) |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | // Assign attributes. |
| 418 | // Also, determine whether we need to save character data or comments. |
| 419 | for i := range tinfo.fields { |
| 420 | finfo := &tinfo.fields[i] |
| 421 | switch finfo.flags & fMode { |
| 422 | case fAttr: |
| 423 | strv := finfo.value(sv) |
| 424 | // Look for attribute. |
| 425 | for _, a := range start.Attr { |
| 426 | if a.Name.Local == finfo.name && (finfo.xmlns == "" || finfo.xmlns == a.Name.Space) { |
| 427 | if err := p.unmarshalAttr(strv, a); err != nil { |
| 428 | return err |
| 429 | } |
| 430 | break |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | case fCharData: |
| 435 | if !saveData.IsValid() { |
| 436 | saveData = finfo.value(sv) |
| 437 | } |
| 438 | |
| 439 | case fComment: |
| 440 | if !saveComment.IsValid() { |
| 441 | saveComment = finfo.value(sv) |
| 442 | } |
| 443 | |
| 444 | case fAny, fAny | fElement: |
| 445 | if !saveAny.IsValid() { |
| 446 | saveAny = finfo.value(sv) |
| 447 | } |
| 448 | |
| 449 | case fInnerXml: |
| 450 | if !saveXML.IsValid() { |
| 451 | saveXML = finfo.value(sv) |
| 452 | if p.saved == nil { |
| 453 | saveXMLIndex = 0 |
| 454 | p.saved = new(bytes.Buffer) |
| 455 | } else { |
| 456 | saveXMLIndex = p.savedOffset() |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | // Find end element. |
| 464 | // Process sub-elements along the way. |
| 465 | Loop: |
| 466 | for { |
| 467 | var savedOffset int |
| 468 | if saveXML.IsValid() { |
| 469 | savedOffset = p.savedOffset() |
| 470 | } |
| 471 | tok, err := p.Token() |
| 472 | if err != nil { |
| 473 | return err |
| 474 | } |
| 475 | switch t := tok.(type) { |
| 476 | case StartElement: |
| 477 | consumed := false |
| 478 | if sv.IsValid() { |
| 479 | consumed, err = p.unmarshalPath(tinfo, sv, nil, &t) |
| 480 | if err != nil { |
| 481 | return err |
| 482 | } |
| 483 | if !consumed && saveAny.IsValid() { |
| 484 | consumed = true |
| 485 | if err := p.unmarshal(saveAny, &t); err != nil { |
| 486 | return err |
| 487 | } |
| 488 | } |
| 489 | } |
| 490 | if !consumed { |
| 491 | if err := p.Skip(); err != nil { |
| 492 | return err |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | case EndElement: |
| 497 | if saveXML.IsValid() { |
| 498 | saveXMLData = p.saved.Bytes()[saveXMLIndex:savedOffset] |
| 499 | if saveXMLIndex == 0 { |
| 500 | p.saved = nil |
| 501 | } |
| 502 | } |
| 503 | break Loop |
| 504 | |
| 505 | case CharData: |
| 506 | if saveData.IsValid() { |
| 507 | data = append(data, t...) |
| 508 | } |
| 509 | |
| 510 | case Comment: |
| 511 | if saveComment.IsValid() { |
| 512 | comment = append(comment, t...) |
| 513 | } |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | if saveData.IsValid() && saveData.CanInterface() && saveData.Type().Implements(textUnmarshalerType) { |
| 518 | if err := saveData.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil { |
| 519 | return err |
| 520 | } |
| 521 | saveData = reflect.Value{} |
| 522 | } |
| 523 | |
| 524 | if saveData.IsValid() && saveData.CanAddr() { |
| 525 | pv := saveData.Addr() |
| 526 | if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) { |
| 527 | if err := pv.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil { |
| 528 | return err |
| 529 | } |
| 530 | saveData = reflect.Value{} |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | if err := copyValue(saveData, data); err != nil { |
| 535 | return err |
| 536 | } |
| 537 | |
| 538 | switch t := saveComment; t.Kind() { |
| 539 | case reflect.String: |
| 540 | t.SetString(string(comment)) |
| 541 | case reflect.Slice: |
| 542 | t.Set(reflect.ValueOf(comment)) |
| 543 | } |
| 544 | |
| 545 | switch t := saveXML; t.Kind() { |
| 546 | case reflect.String: |
| 547 | t.SetString(string(saveXMLData)) |
| 548 | case reflect.Slice: |
| 549 | t.Set(reflect.ValueOf(saveXMLData)) |
| 550 | } |
| 551 | |
| 552 | return nil |
| 553 | } |
| 554 | |
| 555 | func copyValue(dst reflect.Value, src []byte) (err error) { |
| 556 | dst0 := dst |
| 557 | |
| 558 | if dst.Kind() == reflect.Ptr { |
| 559 | if dst.IsNil() { |
| 560 | dst.Set(reflect.New(dst.Type().Elem())) |
| 561 | } |
| 562 | dst = dst.Elem() |
| 563 | } |
| 564 | |
| 565 | // Save accumulated data. |
| 566 | switch dst.Kind() { |
| 567 | case reflect.Invalid: |
| 568 | // Probably a comment. |
| 569 | default: |
| 570 | return errors.New("cannot unmarshal into " + dst0.Type().String()) |
| 571 | case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 572 | itmp, err := strconv.ParseInt(string(src), 10, dst.Type().Bits()) |
| 573 | if err != nil { |
| 574 | return err |
| 575 | } |
| 576 | dst.SetInt(itmp) |
| 577 | case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
| 578 | utmp, err := strconv.ParseUint(string(src), 10, dst.Type().Bits()) |
| 579 | if err != nil { |
| 580 | return err |
| 581 | } |
| 582 | dst.SetUint(utmp) |
| 583 | case reflect.Float32, reflect.Float64: |
| 584 | ftmp, err := strconv.ParseFloat(string(src), dst.Type().Bits()) |
| 585 | if err != nil { |
| 586 | return err |
| 587 | } |
| 588 | dst.SetFloat(ftmp) |
| 589 | case reflect.Bool: |
| 590 | value, err := strconv.ParseBool(strings.TrimSpace(string(src))) |
| 591 | if err != nil { |
| 592 | return err |
| 593 | } |
| 594 | dst.SetBool(value) |
| 595 | case reflect.String: |
| 596 | dst.SetString(string(src)) |
| 597 | case reflect.Slice: |
| 598 | if len(src) == 0 { |
| 599 | // non-nil to flag presence |
| 600 | src = []byte{} |
| 601 | } |
| 602 | dst.SetBytes(src) |
| 603 | } |
| 604 | return nil |
| 605 | } |
| 606 | |
| 607 | // unmarshalPath walks down an XML structure looking for wanted |
| 608 | // paths, and calls unmarshal on them. |
| 609 | // The consumed result tells whether XML elements have been consumed |
| 610 | // from the Decoder until start's matching end element, or if it's |
| 611 | // still untouched because start is uninteresting for sv's fields. |
| 612 | func (p *Decoder) unmarshalPath(tinfo *typeInfo, sv reflect.Value, parents []string, start *StartElement) (consumed bool, err error) { |
| 613 | recurse := false |
| 614 | Loop: |
| 615 | for i := range tinfo.fields { |
| 616 | finfo := &tinfo.fields[i] |
| 617 | if finfo.flags&fElement == 0 || len(finfo.parents) < len(parents) || finfo.xmlns != "" && finfo.xmlns != start.Name.Space { |
| 618 | continue |
| 619 | } |
| 620 | for j := range parents { |
| 621 | if parents[j] != finfo.parents[j] { |
| 622 | continue Loop |
| 623 | } |
| 624 | } |
| 625 | if len(finfo.parents) == len(parents) && finfo.name == start.Name.Local { |
| 626 | // It's a perfect match, unmarshal the field. |
| 627 | return true, p.unmarshal(finfo.value(sv), start) |
| 628 | } |
| 629 | if len(finfo.parents) > len(parents) && finfo.parents[len(parents)] == start.Name.Local { |
| 630 | // It's a prefix for the field. Break and recurse |
| 631 | // since it's not ok for one field path to be itself |
| 632 | // the prefix for another field path. |
| 633 | recurse = true |
| 634 | |
| 635 | // We can reuse the same slice as long as we |
| 636 | // don't try to append to it. |
| 637 | parents = finfo.parents[:len(parents)+1] |
| 638 | break |
| 639 | } |
| 640 | } |
| 641 | if !recurse { |
| 642 | // We have no business with this element. |
| 643 | return false, nil |
| 644 | } |
| 645 | // The element is not a perfect match for any field, but one |
| 646 | // or more fields have the path to this element as a parent |
| 647 | // prefix. Recurse and attempt to match these. |
| 648 | for { |
| 649 | var tok Token |
| 650 | tok, err = p.Token() |
| 651 | if err != nil { |
| 652 | return true, err |
| 653 | } |
| 654 | switch t := tok.(type) { |
| 655 | case StartElement: |
| 656 | consumed2, err := p.unmarshalPath(tinfo, sv, parents, &t) |
| 657 | if err != nil { |
| 658 | return true, err |
| 659 | } |
| 660 | if !consumed2 { |
| 661 | if err := p.Skip(); err != nil { |
| 662 | return true, err |
| 663 | } |
| 664 | } |
| 665 | case EndElement: |
| 666 | return true, nil |
| 667 | } |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | // Skip reads tokens until it has consumed the end element |
| 672 | // matching the most recent start element already consumed. |
| 673 | // It recurs if it encounters a start element, so it can be used to |
| 674 | // skip nested structures. |
| 675 | // It returns nil if it finds an end element matching the start |
| 676 | // element; otherwise it returns an error describing the problem. |
| 677 | func (d *Decoder) Skip() error { |
| 678 | for { |
| 679 | tok, err := d.Token() |
| 680 | if err != nil { |
| 681 | return err |
| 682 | } |
| 683 | switch tok.(type) { |
| 684 | case StartElement: |
| 685 | if err := d.Skip(); err != nil { |
| 686 | return err |
| 687 | } |
| 688 | case EndElement: |
| 689 | return nil |
| 690 | } |
| 691 | } |
| 692 | } |