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package toml_test
import (
"bytes"
"fmt"
"log"
"time"
"github.com/BurntSushi/toml"
)
func ExampleEncoder_Encode() {
date, _ := time.Parse(time.RFC822, "14 Mar 10 18:00 UTC")
var config = map[string]interface{}{
"date": date,
"counts": []int{1, 1, 2, 3, 5, 8},
"hash": map[string]string{
"key1": "val1",
"key2": "val2",
},
}
buf := new(bytes.Buffer)
if err := toml.NewEncoder(buf).Encode(config); err != nil {
log.Fatal(err)
}
fmt.Println(buf.String())
// Output:
// counts = [1, 1, 2, 3, 5, 8]
// date = 2010-03-14T18:00:00Z
//
// [hash]
// key1 = "val1"
// key2 = "val2"
}
func ExampleMetaData_PrimitiveDecode() {
var md toml.MetaData
var err error
var tomlBlob = `
ranking = ["Springsteen", "J Geils"]
[bands.Springsteen]
started = 1973
albums = ["Greetings", "WIESS", "Born to Run", "Darkness"]
[bands."J Geils"]
started = 1970
albums = ["The J. Geils Band", "Full House", "Blow Your Face Out"]
`
type band struct {
Started int
Albums []string
}
type classics struct {
Ranking []string
Bands map[string]toml.Primitive
}
// Do the initial decode. Reflection is delayed on Primitive values.
var music classics
if md, err = toml.Decode(tomlBlob, &music); err != nil {
log.Fatal(err)
}
// MetaData still includes information on Primitive values.
fmt.Printf("Is `bands.Springsteen` defined? %v\n",
md.IsDefined("bands", "Springsteen"))
// Decode primitive data into Go values.
for _, artist := range music.Ranking {
// A band is a primitive value, so we need to decode it to get a
// real `band` value.
primValue := music.Bands[artist]
var aBand band
if err = md.PrimitiveDecode(primValue, &aBand); err != nil {
log.Fatal(err)
}
fmt.Printf("%s started in %d.\n", artist, aBand.Started)
}
// Check to see if there were any fields left undecoded.
// Note that this won't be empty before decoding the Primitive value!
fmt.Printf("Undecoded: %q\n", md.Undecoded())
// Output:
// Is `bands.Springsteen` defined? true
// Springsteen started in 1973.
// J Geils started in 1970.
// Undecoded: []
}
func ExampleDecode() {
var tomlBlob = `
# Some comments.
[alpha]
ip = "10.0.0.1"
[alpha.config]
Ports = [ 8001, 8002 ]
Location = "Toronto"
Created = 1987-07-05T05:45:00Z
[beta]
ip = "10.0.0.2"
[beta.config]
Ports = [ 9001, 9002 ]
Location = "New Jersey"
Created = 1887-01-05T05:55:00Z
`
type serverConfig struct {
Ports []int
Location string
Created time.Time
}
type server struct {
IP string `toml:"ip,omitempty"`
Config serverConfig `toml:"config"`
}
type servers map[string]server
var config servers
if _, err := toml.Decode(tomlBlob, &config); err != nil {
log.Fatal(err)
}
for _, name := range []string{"alpha", "beta"} {
s := config[name]
fmt.Printf("Server: %s (ip: %s) in %s created on %s\n",
name, s.IP, s.Config.Location,
s.Config.Created.Format("2006-01-02"))
fmt.Printf("Ports: %v\n", s.Config.Ports)
}
// Output:
// Server: alpha (ip: 10.0.0.1) in Toronto created on 1987-07-05
// Ports: [8001 8002]
// Server: beta (ip: 10.0.0.2) in New Jersey created on 1887-01-05
// Ports: [9001 9002]
}
type duration struct {
time.Duration
}
func (d *duration) UnmarshalText(text []byte) error {
var err error
d.Duration, err = time.ParseDuration(string(text))
return err
}
// Example Unmarshaler shows how to decode TOML strings into your own
// custom data type.
func Example_unmarshaler() {
blob := `
[[song]]
name = "Thunder Road"
duration = "4m49s"
[[song]]
name = "Stairway to Heaven"
duration = "8m03s"
`
type song struct {
Name string
Duration duration
}
type songs struct {
Song []song
}
var favorites songs
if _, err := toml.Decode(blob, &favorites); err != nil {
log.Fatal(err)
}
// Code to implement the TextUnmarshaler interface for `duration`:
//
// type duration struct {
// time.Duration
// }
//
// func (d *duration) UnmarshalText(text []byte) error {
// var err error
// d.Duration, err = time.ParseDuration(string(text))
// return err
// }
for _, s := range favorites.Song {
fmt.Printf("%s (%s)\n", s.Name, s.Duration)
}
// Output:
// Thunder Road (4m49s)
// Stairway to Heaven (8m3s)
}
// Example StrictDecoding shows how to detect whether there are keys in the
// TOML document that weren't decoded into the value given. This is useful
// for returning an error to the user if they've included extraneous fields
// in their configuration.
func Example_strictDecoding() {
var blob = `
key1 = "value1"
key2 = "value2"
key3 = "value3"
`
type config struct {
Key1 string
Key3 string
}
var conf config
md, err := toml.Decode(blob, &conf)
if err != nil {
log.Fatal(err)
}
fmt.Printf("Undecoded keys: %q\n", md.Undecoded())
// Output:
// Undecoded keys: ["key2"]
}
type order struct {
// NOTE `order.parts` is a private slice of type `part` which is an
// interface and may only be loaded from toml using the UnmarshalTOML()
// method of the Umarshaler interface.
parts parts
}
type parts []part
type part interface {
Name() string
}
type valve struct {
Type string
ID string
Size float32
Rating int
}
func (v *valve) Name() string {
return fmt.Sprintf("VALVE: %s", v.ID)
}
type pipe struct {
Type string
ID string
Length float32
Diameter int
}
func (p *pipe) Name() string {
return fmt.Sprintf("PIPE: %s", p.ID)
}
type cable struct {
Type string
ID string
Length int
Rating float32
}
func (c *cable) Name() string {
return fmt.Sprintf("CABLE: %s", c.ID)
}
func (o *order) UnmarshalTOML(data interface{}) error {
// NOTE the example below contains detailed type casting to show how
// the 'data' is retrieved. In operational use, a type cast wrapper
// may be preferred e.g.
//
// func AsMap(v interface{}) (map[string]interface{}, error) {
// return v.(map[string]interface{})
// }
//
// resulting in:
// d, _ := AsMap(data)
//
d, _ := data.(map[string]interface{})
parts, _ := d["parts"].([]map[string]interface{})
for _, p := range parts {
typ, _ := p["type"].(string)
id, _ := p["id"].(string)
// detect the type of part and handle each case
switch p["type"] {
case "valve":
size := float32(p["size"].(float64))
rating := int(p["rating"].(int64))
valve := &valve{
Type: typ,
ID: id,
Size: size,
Rating: rating,
}
o.parts = append(o.parts, valve)
case "pipe":
length := float32(p["length"].(float64))
diameter := int(p["diameter"].(int64))
pipe := &pipe{
Type: typ,
ID: id,
Length: length,
Diameter: diameter,
}
o.parts = append(o.parts, pipe)
case "cable":
length := int(p["length"].(int64))
rating := float32(p["rating"].(float64))
cable := &cable{
Type: typ,
ID: id,
Length: length,
Rating: rating,
}
o.parts = append(o.parts, cable)
}
}
return nil
}
// Example UnmarshalTOML shows how to implement a struct type that knows how to
// unmarshal itself. The struct must take full responsibility for mapping the
// values passed into the struct. The method may be used with interfaces in a
// struct in cases where the actual type is not known until the data is
// examined.
func Example_unmarshalTOML() {
var blob = `
[[parts]]
type = "valve"
id = "valve-1"
size = 1.2
rating = 4
[[parts]]
type = "valve"
id = "valve-2"
size = 2.1
rating = 5
[[parts]]
type = "pipe"
id = "pipe-1"
length = 2.1
diameter = 12
[[parts]]
type = "cable"
id = "cable-1"
length = 12
rating = 3.1
`
o := &order{}
err := toml.Unmarshal([]byte(blob), o)
if err != nil {
log.Fatal(err)
}
fmt.Println(len(o.parts))
for _, part := range o.parts {
fmt.Println(part.Name())
}
// Code to implement UmarshalJSON.
// type order struct {
// // NOTE `order.parts` is a private slice of type `part` which is an
// // interface and may only be loaded from toml using the
// // UnmarshalTOML() method of the Umarshaler interface.
// parts parts
// }
// func (o *order) UnmarshalTOML(data interface{}) error {
// // NOTE the example below contains detailed type casting to show how
// // the 'data' is retrieved. In operational use, a type cast wrapper
// // may be preferred e.g.
// //
// // func AsMap(v interface{}) (map[string]interface{}, error) {
// // return v.(map[string]interface{})
// // }
// //
// // resulting in:
// // d, _ := AsMap(data)
// //
// d, _ := data.(map[string]interface{})
// parts, _ := d["parts"].([]map[string]interface{})
// for _, p := range parts {
// typ, _ := p["type"].(string)
// id, _ := p["id"].(string)
// // detect the type of part and handle each case
// switch p["type"] {
// case "valve":
// size := float32(p["size"].(float64))
// rating := int(p["rating"].(int64))
// valve := &valve{
// Type: typ,
// ID: id,
// Size: size,
// Rating: rating,
// }
// o.parts = append(o.parts, valve)
// case "pipe":
// length := float32(p["length"].(float64))
// diameter := int(p["diameter"].(int64))
// pipe := &pipe{
// Type: typ,
// ID: id,
// Length: length,
// Diameter: diameter,
// }
// o.parts = append(o.parts, pipe)
// case "cable":
// length := int(p["length"].(int64))
// rating := float32(p["rating"].(float64))
// cable := &cable{
// Type: typ,
// ID: id,
// Length: length,
// Rating: rating,
// }
// o.parts = append(o.parts, cable)
// }
// }
// return nil
// }
// type parts []part
// type part interface {
// Name() string
// }
// type valve struct {
// Type string
// ID string
// Size float32
// Rating int
// }
// func (v *valve) Name() string {
// return fmt.Sprintf("VALVE: %s", v.ID)
// }
// type pipe struct {
// Type string
// ID string
// Length float32
// Diameter int
// }
// func (p *pipe) Name() string {
// return fmt.Sprintf("PIPE: %s", p.ID)
// }
// type cable struct {
// Type string
// ID string
// Length int
// Rating float32
// }
// func (c *cable) Name() string {
// return fmt.Sprintf("CABLE: %s", c.ID)
// }
// Output:
// 4
// VALVE: valve-1
// VALVE: valve-2
// PIPE: pipe-1
// CABLE: cable-1
}
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