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decoder.go
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decoder.go
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package xml2json
import (
"encoding/xml"
"io"
)
// A Decoder reads and decodes XML objects from an input stream.
type Decoder struct {
r io.Reader
err error
attrPrefix string
}
type element struct {
parent *element
n *Node
label string
}
// NewDecoder returns a new decoder that reads from r.
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{r: r, attrPrefix: "-"}
}
// NewDecoder returns a new decoder that reads from r with custom attribute prefiх.
func NewDecoderWithAttrPrefix(r io.Reader, attrPrefix string) *Decoder {
return &Decoder{r: r, attrPrefix: attrPrefix}
}
// Decode reads the next JSON-encoded value from its
// input and stores it in the value pointed to by v.
func (dec *Decoder) Decode(root *Node) error {
xmlDec := xml.NewDecoder(dec.r)
// Create first element from the root node
elem := &element{
parent: nil,
n: root,
}
for {
t, _ := xmlDec.Token()
if t == nil {
break
}
switch se := t.(type) {
case xml.StartElement:
// Build new a new current element and link it to its parent
elem = &element{
parent: elem,
n: &Node{},
label: se.Name.Local,
}
// Extract attributes as children
for _, a := range se.Attr {
elem.n.AddChild(dec.attrPrefix+a.Name.Local, &Node{Data: a.Value})
}
case xml.CharData:
// Extract XML data (if any)
elem.n.Data = string(xml.CharData(se))
case xml.EndElement:
// And add it to its parent list
if elem.parent != nil {
elem.parent.n.AddChild(elem.label, elem.n)
}
// Then change the current element to its parent
elem = elem.parent
}
}
return nil
}