codekingpro/portable-devtools

1// Copyright 2018 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4 5//go:build goexperiment.jsonv26 7package json_test8 9import (10	"fmt"11	"log"12	"strings"13 14	"encoding/json"15)16 17type Size int18 19const (20	Unrecognized Size = iota21	Small22	Large23)24 25func (s *Size) UnmarshalText(text []byte) error {26	switch strings.ToLower(string(text)) {27	default:28		*s = Unrecognized29	case "small":30		*s = Small31	case "large":32		*s = Large33	}34	return nil35}36 37func (s Size) MarshalText() ([]byte, error) {38	var name string39	switch s {40	default:41		name = "unrecognized"42	case Small:43		name = "small"44	case Large:45		name = "large"46	}47	return []byte(name), nil48}49 50func Example_textMarshalJSON() {51	blob := `["small","regular","large","unrecognized","small","normal","small","large"]`52	var inventory []Size53	if err := json.Unmarshal([]byte(blob), &inventory); err != nil {54		log.Fatal(err)55	}56 57	counts := make(map[Size]int)58	for _, size := range inventory {59		counts[size] += 160	}61 62	fmt.Printf("Inventory Counts:\n* Small:        %d\n* Large:        %d\n* Unrecognized: %d\n",63		counts[Small], counts[Large], counts[Unrecognized])64 65	// Output:66	// Inventory Counts:67	// * Small:        368	// * Large:        269	// * Unrecognized: 370}71