// UnmarshalXML appends the property names and values enclosed within start
// to ps.
//
// An xml:lang attribute that is defined either on the DAV:prop or property
// name XML element is propagated to the property's Lang field.
//
// UnmarshalXML returns an error if start does not contain any properties or if
// property values contain syntactically incorrect XML.
func (ps *proppatchProps) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
lang := xmlLang(start, "")
for {
t, err := next(d)
if err != nil {
return err
}
switch elem := t.(type) {
case xml.EndElement:
if len(*ps) == 0 {
return fmt.Errorf("%s must not be empty", start.Name.Local)
}
return nil
case xml.StartElement:
p := Property{
XMLName: t.(xml.StartElement).Name,
Lang: xmlLang(t.(xml.StartElement), lang),
}
err = d.DecodeElement(((*xmlValue)(&p.InnerXML)), &elem)
if err != nil {
return err
}
*ps = append(*ps, p)
}
}
}
// Next returns the next token, if any, in the XML stream of d.
// RFC 4918 requires to ignore comments, processing instructions
// and directives.
// http://www.webdav.org/specs/rfc4918.html#property_values
// http://www.webdav.org/specs/rfc4918.html#xml-extensibility
func next(d *xml.Decoder) (xml.Token, error) {
for {
t, err := d.Token()
if err != nil {
return t, err
}
switch t.(type) {
case xml.Comment, xml.Directive, xml.ProcInst:
continue
default:
return t, nil
}
}
}