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