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elem.go
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package xmlwriter
import "fmt"
// Elem represents an XML element to be written by the writer.
type Elem struct {
Prefix string
URI string
Name string
Attrs []Attr
// A tree of writable nodes can be assigned to this - they will
// be written when the node is opened. Not heap-friendly.
Content []Writable
// When ending this element, use the full style, i.e. <foo></foo>
// even if the element is empty.
Full bool
// bookkeeping
namespaces []ns
}
type ns struct {
prefix string
uri string
elem bool
written bool
}
func (e Elem) kind() NodeKind { return ElemNode }
func (e Elem) start(w *Writer) error {
if err := w.pushBegin(ElemNode, noNodeFlag|docNodeFlag|elemNodeFlag); err != nil {
return err
}
np := &w.nodes[w.current+1]
np.clear()
np.kind = ElemNode
np.flag = elemNodeFlag
np.elem = e
return w.pushEnd()
}
func (e Elem) write(w *Writer) error {
if err := e.start(w); err != nil {
return err
}
if err := w.End(ElemNode); err != nil {
return err
}
return nil
}
func (e Elem) fullName() string {
name := e.Name
if e.Prefix != "" {
name = e.Prefix + ":" + name
}
return name
}
func (e Elem) open(n *node, w *Writer) error {
name := e.fullName()
if w.Enforce {
if name == "" {
return fmt.Errorf("xmlwriter: element name must not be empty")
}
if err := CheckName(name); err != nil {
return err
}
}
if e.Prefix != "" && e.URI != "" {
n.elem.namespaces = append(e.namespaces, ns{prefix: e.Prefix, uri: e.URI, elem: true})
}
w.printer.WriteByte('<')
w.printer.WriteString(name)
if e.Prefix != "" && e.URI != "" {
// we can assume the prefix has been enforced already by open running
// CheckName on elem.fullName()
n.elem.namespaces[0].written = true
if err := w.printer.printAttr("xmlns:"+e.Prefix, e.URI, w.Enforce); err != nil {
return err
}
}
if len(n.elem.Attrs) > 0 {
if err := w.WriteAttr(n.elem.Attrs...); err != nil {
return err
}
n.elem.Attrs = nil
}
return w.printer.cachedWriteError()
}
func (e Elem) opened(n *node, w *Writer, prev NodeState) error {
if len(e.namespaces) > 0 {
for i, ns := range e.namespaces {
if ns.written == false {
if err := w.printer.printAttr("xmlns:"+ns.prefix, ns.uri, w.Enforce); err != nil {
return err
}
n.elem.namespaces[i].written = true
}
}
}
if n.children == 0 && !e.Full && len(e.Content) == 0 {
w.printer.WriteString("/>")
} else {
w.printer.WriteByte('>')
}
if len(e.Content) > 0 {
var err error
for _, c := range e.Content {
switch t := c.(type) {
case Text:
err = w.WriteText(string(t))
case Elem:
err = w.WriteElem(t)
case Comment:
err = w.WriteComment(t)
case CData:
err = w.WriteCData(t)
default:
return fmt.Errorf("xmlwriter: unexpected child of element")
}
if err != nil {
// TODO: context about which index failed
return err
}
}
}
return w.printer.cachedWriteError()
}
func (e Elem) end(n *node, w *Writer, prev NodeState) error {
if prev != StateOpen || e.Full || n.children > 0 {
w.printer.WriteString("</")
w.printer.WriteString(e.fullName())
w.printer.WriteByte('>')
}
return w.printer.cachedWriteError()
}