/
xml.go
98 lines (88 loc) · 1.99 KB
/
xml.go
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package next
import (
"bytes"
"encoding/xml"
"errors"
"io"
)
type Xml struct {
}
// New returns a pointer to a new, empty `Json` object
func NewXml() *Xml {
return &Xml{}
}
// ToMap parses xml reading from xmlReader and returns the first-level sub-node key-value set,
// if the first-level sub-node contains child nodes, skip it.
func (x *Xml) ToMap(xmlReader io.Reader) (m map[string]string, err error) {
if xmlReader == nil {
err = errors.New("nil xmlReader")
return
}
m = make(map[string]string)
var (
d = xml.NewDecoder(xmlReader)
tk xml.Token
depth = 0 // current xml.Token depth
key string
value bytes.Buffer
)
for {
tk, err = d.Token()
if err != nil {
if err == io.EOF {
err = nil
}
return
}
switch v := tk.(type) {
case xml.StartElement:
depth++
switch depth {
case 2:
key = v.Name.Local
value.Reset()
case 3:
if err = d.Skip(); err != nil {
return
}
depth--
key = "" // key == "" indicates that the node with depth==2 has children
}
case xml.CharData:
if depth == 2 && key != "" {
value.Write(v)
}
case xml.EndElement:
if depth == 2 && key != "" {
m[key] = value.String()
}
depth--
}
}
}
// ToXML marshal map[string]string to xmlWriter with xml format, the root node name is xml.
// NOTE: This function assumes the key of m map[string]string are legitimate xml name string
// that does not contain the required escape character!
func (x *Xml) ToXML(xmlWriter io.Writer, m map[string]string) (err error) {
if xmlWriter == nil {
return errors.New("nil xmlWriter")
}
if _, err = io.WriteString(xmlWriter, "<xml>"); err != nil {
return
}
for k, v := range m {
if _, err = io.WriteString(xmlWriter, "<"+k+">"); err != nil {
return
}
if err = xml.EscapeText(xmlWriter, []byte(v)); err != nil {
return
}
if _, err = io.WriteString(xmlWriter, "</"+k+">"); err != nil {
return
}
}
if _, err = io.WriteString(xmlWriter, "</xml>"); err != nil {
return
}
return
}