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go-xmpp/stanza/node.go

64 lines
1.6 KiB

package stanza
import "encoding/xml"
// ============================================================================
// Generic / unknown content
// Node is a generic structure to represent XML data. It is used to parse
// unreferenced or custom stanza payload.
type Node struct {
XMLName xml.Name
Attrs []xml.Attr `xml:"-"`
Content string `xml:",cdata"`
Nodes []Node `xml:",any"`
}
func (n *Node) Namespace() string {
return n.XMLName.Space
}
// Attr represents generic XML attributes, as used on the generic XML Node
// representation.
type Attr struct {
K string
V string
}
// UnmarshalXML is a custom unmarshal function used by xml.Unmarshal to
// transform generic XML content into hierarchical Node structure.
func (n *Node) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// Assign "n.Attrs = start.Attr", without repeating xmlns in attributes:
for _, attr := range start.Attr {
// Do not repeat xmlns, it is already in XMLName
if attr.Name.Local != "xmlns" {
n.Attrs = append(n.Attrs, attr)
}
}
type node Node
return d.DecodeElement((*node)(n), &start)
}
// MarshalXML is a custom XML serializer used by xml.Marshal to serialize a
// Node structure to XML.
func (n Node) MarshalXML(e *xml.Encoder, start xml.StartElement) (err error) {
start.Attr = n.Attrs
start.Name = n.XMLName
err = e.EncodeToken(start)
if err != nil {
return err
}
err = e.EncodeElement(n.Nodes, xml.StartElement{Name: n.XMLName})
if err != nil {
return err
}
if n.Content != "" {
err = e.EncodeToken(xml.CharData(n.Content))
if err != nil {
return err
}
}
return e.EncodeToken(xml.EndElement{Name: start.Name})
}