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70 lines
1.3 KiB
70 lines
1.3 KiB
// 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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//go:build goexperiment.jsonv2 |
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package json_test |
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import ( |
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"fmt" |
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"log" |
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"strings" |
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"encoding/json" |
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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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