Adding upstream version 0.10.5.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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313
test/example/example_test.go
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313
test/example/example_test.go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package json_test
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import (
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"bytes"
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"fmt"
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"io"
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"log"
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"os"
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"strings"
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"github.com/goccy/go-json"
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)
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func ExampleMarshal() {
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type ColorGroup struct {
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ID int
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Name string
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Colors []string
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}
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group := ColorGroup{
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ID: 1,
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Name: "Reds",
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Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
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}
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b, err := json.Marshal(group)
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if err != nil {
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fmt.Println("error:", err)
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}
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os.Stdout.Write(b)
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// Output:
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// {"ID":1,"Name":"Reds","Colors":["Crimson","Red","Ruby","Maroon"]}
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}
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func ExampleUnmarshal() {
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var jsonBlob = []byte(`[
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{"Name": "Platypus", "Order": "Monotremata"},
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{"Name": "Quoll", "Order": "Dasyuromorphia"}
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]`)
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type Animal struct {
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Name string
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Order string
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}
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var animals []Animal
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err := json.Unmarshal(jsonBlob, &animals)
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if err != nil {
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fmt.Println("error:", err)
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}
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fmt.Printf("%+v", animals)
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// Output:
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// [{Name:Platypus Order:Monotremata} {Name:Quoll Order:Dasyuromorphia}]
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}
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// This example uses a Decoder to decode a stream of distinct JSON values.
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func ExampleDecoder() {
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const jsonStream = `
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{"Name": "Ed", "Text": "Knock knock."}
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{"Name": "Sam", "Text": "Who's there?"}
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{"Name": "Ed", "Text": "Go fmt."}
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{"Name": "Sam", "Text": "Go fmt who?"}
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{"Name": "Ed", "Text": "Go fmt yourself!"}
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`
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type Message struct {
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Name, Text string
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}
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dec := json.NewDecoder(strings.NewReader(jsonStream))
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for {
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var m Message
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if err := dec.Decode(&m); err == io.EOF {
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break
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} else if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%s: %s\n", m.Name, m.Text)
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}
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// Output:
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// Ed: Knock knock.
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// Sam: Who's there?
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// Ed: Go fmt.
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// Sam: Go fmt who?
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// Ed: Go fmt yourself!
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}
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// This example uses a Decoder to decode a stream of distinct JSON values.
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func ExampleDecoder_Token() {
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const jsonStream = `
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{"Message": "Hello", "Array": [1, 2, 3], "Null": null, "Number": 1.234}
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`
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dec := json.NewDecoder(strings.NewReader(jsonStream))
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for {
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t, err := dec.Token()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%T: %v", t, t)
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if dec.More() {
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fmt.Printf(" (more)")
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}
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fmt.Printf("\n")
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}
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// Output:
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// json.Delim: { (more)
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// string: Message (more)
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// string: Hello (more)
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// string: Array (more)
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// json.Delim: [ (more)
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// float64: 1 (more)
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// float64: 2 (more)
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// float64: 3
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// json.Delim: ] (more)
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// string: Null (more)
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// <nil>: <nil> (more)
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// string: Number (more)
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// float64: 1.234
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// json.Delim: }
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}
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// This example uses a Decoder to decode a streaming array of JSON objects.
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func ExampleDecoder_Decode_stream() {
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const jsonStream = `
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[
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{"Name": "Ed", "Text": "Knock knock."},
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{"Name": "Sam", "Text": "Who's there?"},
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{"Name": "Ed", "Text": "Go fmt."},
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{"Name": "Sam", "Text": "Go fmt who?"},
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{"Name": "Ed", "Text": "Go fmt yourself!"}
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]
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`
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type Message struct {
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Name, Text string
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}
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dec := json.NewDecoder(strings.NewReader(jsonStream))
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// read open bracket
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t, err := dec.Token()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%T: %v\n", t, t)
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// while the array contains values
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for dec.More() {
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var m Message
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// decode an array value (Message)
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err := dec.Decode(&m)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%v: %v\n", m.Name, m.Text)
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}
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// read closing bracket
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t, err = dec.Token()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%T: %v\n", t, t)
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// Output:
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// json.Delim: [
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// Ed: Knock knock.
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// Sam: Who's there?
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// Ed: Go fmt.
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// Sam: Go fmt who?
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// Ed: Go fmt yourself!
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// json.Delim: ]
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}
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// This example uses RawMessage to delay parsing part of a JSON message.
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func ExampleRawMessage_unmarshal() {
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type Color struct {
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Space string
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Point json.RawMessage // delay parsing until we know the color space
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}
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type RGB struct {
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R uint8
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G uint8
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B uint8
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}
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type YCbCr struct {
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Y uint8
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Cb int8
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Cr int8
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}
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var j = []byte(`[
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{"Space": "YCbCr", "Point": {"Y": 255, "Cb": 0, "Cr": -10}},
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{"Space": "RGB", "Point": {"R": 98, "G": 218, "B": 255}}
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]`)
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var colors []Color
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err := json.Unmarshal(j, &colors)
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if err != nil {
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log.Fatalln("error:", err)
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}
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for _, c := range colors {
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var dst interface{}
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switch c.Space {
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case "RGB":
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dst = new(RGB)
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case "YCbCr":
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dst = new(YCbCr)
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}
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err := json.Unmarshal(c.Point, dst)
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if err != nil {
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log.Fatalln("error:", err)
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}
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fmt.Println(c.Space, dst)
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}
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// Output:
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// YCbCr &{255 0 -10}
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// RGB &{98 218 255}
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}
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// This example uses RawMessage to use a precomputed JSON during marshal.
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func ExampleRawMessage_marshal() {
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h := json.RawMessage(`{"precomputed": true}`)
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c := struct {
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Header *json.RawMessage `json:"header"`
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Body string `json:"body"`
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}{Header: &h, Body: "Hello Gophers!"}
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b, err := json.MarshalIndent(&c, "", "\t")
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if err != nil {
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fmt.Println("error:", err)
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}
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os.Stdout.Write(b)
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// Output:
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// {
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// "header": {
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// "precomputed": true
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// },
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// "body": "Hello Gophers!"
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// }
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}
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func ExampleIndent() {
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type Road struct {
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Name string
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Number int
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}
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roads := []Road{
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{"Diamond Fork", 29},
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{"Sheep Creek", 51},
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}
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b, err := json.Marshal(roads)
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if err != nil {
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log.Fatal(err)
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}
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var out bytes.Buffer
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json.Indent(&out, b, "=", "\t")
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out.WriteTo(os.Stdout)
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// Output:
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// [
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// = {
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// = "Name": "Diamond Fork",
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// = "Number": 29
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// = },
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// = {
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// = "Name": "Sheep Creek",
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// = "Number": 51
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// = }
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// =]
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}
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/*
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func ExampleMarshalIndent() {
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data := map[string]int{
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"a": 1,
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"b": 2,
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}
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json, err := json.MarshalIndent(data, "<prefix>", "<indent>")
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println(string(json))
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// Output:
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// {
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// <prefix><indent>"a": 1,
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// <prefix><indent>"b": 2
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// <prefix>}
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}
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*/
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func ExampleValid() {
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goodJSON := `{"example": 1}`
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badJSON := `{"example":2:]}}`
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fmt.Println(json.Valid([]byte(goodJSON)), json.Valid([]byte(badJSON)))
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// Output:
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// true false
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}
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func ExampleHTMLEscape() {
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var out bytes.Buffer
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json.HTMLEscape(&out, []byte(`{"Name":"<b>HTML content</b>"}`))
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out.WriteTo(os.Stdout)
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// Output:
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//{"Name":"\u003cb\u003eHTML content\u003c/b\u003e"}
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}
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