in libgo/go/encoding/xml/read.go [308:600]
func (d *Decoder) unmarshal(val reflect.Value, start *StartElement) error {
// Find start element if we need it.
if start == nil {
for {
tok, err := d.Token()
if err != nil {
return err
}
if t, ok := tok.(StartElement); ok {
start = &t
break
}
}
}
// Load value from interface, but only if the result will be
// usefully addressable.
if val.Kind() == reflect.Interface && !val.IsNil() {
e := val.Elem()
if e.Kind() == reflect.Ptr && !e.IsNil() {
val = e
}
}
if val.Kind() == reflect.Ptr {
if val.IsNil() {
val.Set(reflect.New(val.Type().Elem()))
}
val = val.Elem()
}
if val.CanInterface() && val.Type().Implements(unmarshalerType) {
// This is an unmarshaler with a non-pointer receiver,
// so it's likely to be incorrect, but we do what we're told.
return d.unmarshalInterface(val.Interface().(Unmarshaler), start)
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(unmarshalerType) {
return d.unmarshalInterface(pv.Interface().(Unmarshaler), start)
}
}
if val.CanInterface() && val.Type().Implements(textUnmarshalerType) {
return d.unmarshalTextInterface(val.Interface().(encoding.TextUnmarshaler))
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
return d.unmarshalTextInterface(pv.Interface().(encoding.TextUnmarshaler))
}
}
var (
data []byte
saveData reflect.Value
comment []byte
saveComment reflect.Value
saveXML reflect.Value
saveXMLIndex int
saveXMLData []byte
saveAny reflect.Value
sv reflect.Value
tinfo *typeInfo
err error
)
switch v := val; v.Kind() {
default:
return errors.New("unknown type " + v.Type().String())
case reflect.Interface:
// TODO: For now, simply ignore the field. In the near
// future we may choose to unmarshal the start
// element on it, if not nil.
return d.Skip()
case reflect.Slice:
typ := v.Type()
if typ.Elem().Kind() == reflect.Uint8 {
// []byte
saveData = v
break
}
// Slice of element values.
// Grow slice.
n := v.Len()
v.Set(reflect.Append(val, reflect.Zero(v.Type().Elem())))
// Recur to read element into slice.
if err := d.unmarshal(v.Index(n), start); err != nil {
v.SetLen(n)
return err
}
return nil
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:
saveData = v
case reflect.Struct:
typ := v.Type()
if typ == nameType {
v.Set(reflect.ValueOf(start.Name))
break
}
sv = v
tinfo, err = getTypeInfo(typ)
if err != nil {
return err
}
// Validate and assign element name.
if tinfo.xmlname != nil {
finfo := tinfo.xmlname
if finfo.name != "" && finfo.name != start.Name.Local {
return UnmarshalError("expected element type <" + finfo.name + "> but have <" + start.Name.Local + ">")
}
if finfo.xmlns != "" && finfo.xmlns != start.Name.Space {
e := "expected element <" + finfo.name + "> in name space " + finfo.xmlns + " but have "
if start.Name.Space == "" {
e += "no name space"
} else {
e += start.Name.Space
}
return UnmarshalError(e)
}
fv := finfo.value(sv, initNilPointers)
if _, ok := fv.Interface().(Name); ok {
fv.Set(reflect.ValueOf(start.Name))
}
}
// Assign attributes.
for _, a := range start.Attr {
handled := false
any := -1
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
switch finfo.flags & fMode {
case fAttr:
strv := finfo.value(sv, initNilPointers)
if a.Name.Local == finfo.name && (finfo.xmlns == "" || finfo.xmlns == a.Name.Space) {
if err := d.unmarshalAttr(strv, a); err != nil {
return err
}
handled = true
}
case fAny | fAttr:
if any == -1 {
any = i
}
}
}
if !handled && any >= 0 {
finfo := &tinfo.fields[any]
strv := finfo.value(sv, initNilPointers)
if err := d.unmarshalAttr(strv, a); err != nil {
return err
}
}
}
// Determine whether we need to save character data or comments.
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
switch finfo.flags & fMode {
case fCDATA, fCharData:
if !saveData.IsValid() {
saveData = finfo.value(sv, initNilPointers)
}
case fComment:
if !saveComment.IsValid() {
saveComment = finfo.value(sv, initNilPointers)
}
case fAny, fAny | fElement:
if !saveAny.IsValid() {
saveAny = finfo.value(sv, initNilPointers)
}
case fInnerXML:
if !saveXML.IsValid() {
saveXML = finfo.value(sv, initNilPointers)
if d.saved == nil {
saveXMLIndex = 0
d.saved = new(bytes.Buffer)
} else {
saveXMLIndex = d.savedOffset()
}
}
}
}
}
// Find end element.
// Process sub-elements along the way.
Loop:
for {
var savedOffset int
if saveXML.IsValid() {
savedOffset = d.savedOffset()
}
tok, err := d.Token()
if err != nil {
return err
}
switch t := tok.(type) {
case StartElement:
consumed := false
if sv.IsValid() {
consumed, err = d.unmarshalPath(tinfo, sv, nil, &t)
if err != nil {
return err
}
if !consumed && saveAny.IsValid() {
consumed = true
if err := d.unmarshal(saveAny, &t); err != nil {
return err
}
}
}
if !consumed {
if err := d.Skip(); err != nil {
return err
}
}
case EndElement:
if saveXML.IsValid() {
saveXMLData = d.saved.Bytes()[saveXMLIndex:savedOffset]
if saveXMLIndex == 0 {
d.saved = nil
}
}
break Loop
case CharData:
if saveData.IsValid() {
data = append(data, t...)
}
case Comment:
if saveComment.IsValid() {
comment = append(comment, t...)
}
}
}
if saveData.IsValid() && saveData.CanInterface() && saveData.Type().Implements(textUnmarshalerType) {
if err := saveData.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil {
return err
}
saveData = reflect.Value{}
}
if saveData.IsValid() && saveData.CanAddr() {
pv := saveData.Addr()
if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
if err := pv.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil {
return err
}
saveData = reflect.Value{}
}
}
if err := copyValue(saveData, data); err != nil {
return err
}
switch t := saveComment; t.Kind() {
case reflect.String:
t.SetString(string(comment))
case reflect.Slice:
t.Set(reflect.ValueOf(comment))
}
switch t := saveXML; t.Kind() {
case reflect.String:
t.SetString(string(saveXMLData))
case reflect.Slice:
if t.Type().Elem().Kind() == reflect.Uint8 {
t.Set(reflect.ValueOf(saveXMLData))
}
}
return nil
}