68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
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// Copyright 2018 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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"encoding/json"
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"fmt"
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"log"
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"strings"
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)
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type Size int
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const (
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Unrecognized Size = iota
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Small
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Large
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)
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func (s *Size) UnmarshalText(text []byte) error {
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switch strings.ToLower(string(text)) {
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default:
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*s = Unrecognized
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case "small":
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*s = Small
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case "large":
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*s = Large
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}
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return nil
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}
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func (s Size) MarshalText() ([]byte, error) {
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var name string
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switch s {
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default:
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name = "unrecognized"
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case Small:
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name = "small"
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case Large:
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name = "large"
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}
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return []byte(name), nil
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}
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func Example_textMarshalJSON() {
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blob := `["small","regular","large","unrecognized","small","normal","small","large"]`
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var inventory []Size
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if err := json.Unmarshal([]byte(blob), &inventory); err != nil {
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log.Fatal(err)
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}
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counts := make(map[Size]int)
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for _, size := range inventory {
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counts[size] += 1
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}
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fmt.Printf("Inventory Counts:\n* Small: %d\n* Large: %d\n* Unrecognized: %d\n",
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counts[Small], counts[Large], counts[Unrecognized])
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// Output:
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// Inventory Counts:
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// * Small: 3
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// * Large: 2
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// * Unrecognized: 3
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}
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