You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Go offers built-in support for XML and XML-like
|
|
// formats with the `encoding.xml` package.
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/xml"
|
|
"fmt"
|
|
)
|
|
|
|
// This type will be mapped to XML. Similarly to the
|
|
// JSON examples, field tags contain directives for the
|
|
// encoder and decoder. Here we use some special features
|
|
// of the XML package: the `XMLName` field name dictates
|
|
// the name of the XML element representing this struct;
|
|
// `id,attr` means that the `Id` field is an XML
|
|
// _attribute_ rather than a nested element.
|
|
type Plant struct {
|
|
XMLName xml.Name `xml:"plant"`
|
|
Id int `xml:"id,attr"`
|
|
Name string `xml:"name"`
|
|
Origin []string `xml:"origin"`
|
|
}
|
|
|
|
func (p Plant) String() string {
|
|
return fmt.Sprintf("Plant id=%v, name=%v, origin=%v",
|
|
p.Id, p.Name, p.Origin)
|
|
}
|
|
|
|
func main() {
|
|
coffee := &Plant{Id: 27, Name: "Coffee"}
|
|
coffee.Origin = []string{"Ethiopia", "Brazil"}
|
|
|
|
// Emit XML representing our plant; using
|
|
// `MarshalIndent` to produce a more
|
|
// human-readable output.
|
|
out, _ := xml.MarshalIndent(coffee, " ", " ")
|
|
fmt.Println(string(out))
|
|
|
|
// To add a generic XML header to the output, append
|
|
// it explicitly.
|
|
fmt.Println(xml.Header + string(out))
|
|
|
|
// Use `Unmarhshal` to parse a stream of bytes with XML
|
|
// into a data structure. If the XML is malformed or
|
|
// cannot be mapped onto Plant, a descriptive error
|
|
// will be returned.
|
|
var p Plant
|
|
if err := xml.Unmarshal(out, &p); err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Println(p)
|
|
|
|
tomato := &Plant{Id: 81, Name: "Tomato"}
|
|
tomato.Origin = []string{"Mexico", "California"}
|
|
|
|
// The `parent>child>plant` field tag tells the encoder
|
|
// to nest all `plant`s under `<parent><child>...`
|
|
type Nesting struct {
|
|
XMLName xml.Name `xml:"nesting"`
|
|
Plants []*Plant `xml:"parent>child>plant"`
|
|
}
|
|
|
|
nesting := &Nesting{}
|
|
nesting.Plants = []*Plant{coffee, tomato}
|
|
|
|
out, _ = xml.MarshalIndent(nesting, " ", " ")
|
|
fmt.Println(string(out))
|
|
}
|