mirror of
https://github.com/rocky-linux/peridot.git
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160 lines
3.5 KiB
Go
160 lines
3.5 KiB
Go
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package xmlutil
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import (
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"encoding/xml"
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"fmt"
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"io"
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"sort"
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)
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// A XMLNode contains the values to be encoded or decoded.
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type XMLNode struct {
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Name xml.Name `json:",omitempty"`
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Children map[string][]*XMLNode `json:",omitempty"`
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Text string `json:",omitempty"`
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Attr []xml.Attr `json:",omitempty"`
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namespaces map[string]string
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parent *XMLNode
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}
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// NewXMLElement returns a pointer to a new XMLNode initialized to default values.
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func NewXMLElement(name xml.Name) *XMLNode {
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return &XMLNode{
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Name: name,
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Children: map[string][]*XMLNode{},
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Attr: []xml.Attr{},
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}
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}
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// AddChild adds child to the XMLNode.
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func (n *XMLNode) AddChild(child *XMLNode) {
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child.parent = n
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if _, ok := n.Children[child.Name.Local]; !ok {
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n.Children[child.Name.Local] = []*XMLNode{}
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}
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n.Children[child.Name.Local] = append(n.Children[child.Name.Local], child)
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}
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// XMLToStruct converts a xml.Decoder stream to XMLNode with nested values.
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func XMLToStruct(d *xml.Decoder, s *xml.StartElement) (*XMLNode, error) {
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out := &XMLNode{}
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for {
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tok, err := d.Token()
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if err != nil {
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if err == io.EOF {
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break
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} else {
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return out, err
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}
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}
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if tok == nil {
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break
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}
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switch typed := tok.(type) {
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case xml.CharData:
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out.Text = string(typed.Copy())
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case xml.StartElement:
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el := typed.Copy()
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out.Attr = el.Attr
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if out.Children == nil {
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out.Children = map[string][]*XMLNode{}
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}
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name := typed.Name.Local
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slice := out.Children[name]
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if slice == nil {
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slice = []*XMLNode{}
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}
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node, e := XMLToStruct(d, &el)
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out.findNamespaces()
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if e != nil {
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return out, e
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}
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node.Name = typed.Name
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node.findNamespaces()
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tempOut := *out
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// Save into a temp variable, simply because out gets squashed during
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// loop iterations
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node.parent = &tempOut
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slice = append(slice, node)
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out.Children[name] = slice
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case xml.EndElement:
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if s != nil && s.Name.Local == typed.Name.Local { // matching end token
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return out, nil
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}
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out = &XMLNode{}
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}
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}
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return out, nil
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}
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func (n *XMLNode) findNamespaces() {
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ns := map[string]string{}
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for _, a := range n.Attr {
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if a.Name.Space == "xmlns" {
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ns[a.Value] = a.Name.Local
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}
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}
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n.namespaces = ns
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}
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func (n *XMLNode) findElem(name string) (string, bool) {
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for node := n; node != nil; node = node.parent {
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for _, a := range node.Attr {
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namespace := a.Name.Space
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if v, ok := node.namespaces[namespace]; ok {
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namespace = v
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}
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if name == fmt.Sprintf("%s:%s", namespace, a.Name.Local) {
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return a.Value, true
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}
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}
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}
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return "", false
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}
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// StructToXML writes an XMLNode to a xml.Encoder as tokens.
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func StructToXML(e *xml.Encoder, node *XMLNode, sorted bool) error {
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// Sort Attributes
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attrs := node.Attr
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if sorted {
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sortedAttrs := make([]xml.Attr, len(attrs))
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for _, k := range node.Attr {
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sortedAttrs = append(sortedAttrs, k)
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}
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sort.Sort(xmlAttrSlice(sortedAttrs))
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attrs = sortedAttrs
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}
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e.EncodeToken(xml.StartElement{Name: node.Name, Attr: attrs})
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if node.Text != "" {
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e.EncodeToken(xml.CharData([]byte(node.Text)))
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} else if sorted {
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sortedNames := []string{}
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for k := range node.Children {
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sortedNames = append(sortedNames, k)
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}
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sort.Strings(sortedNames)
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for _, k := range sortedNames {
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for _, v := range node.Children[k] {
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StructToXML(e, v, sorted)
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}
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}
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} else {
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for _, c := range node.Children {
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for _, v := range c {
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StructToXML(e, v, sorted)
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}
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}
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}
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e.EncodeToken(xml.EndElement{Name: node.Name})
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return e.Flush()
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}
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