Function jsonExample

codegen/cli/cli.go:434–473

jsonExample generates a json example

(v any)

// jsonExample generates a json example
func jsonExample(v any) string {
	// In JSON, keys must be a string. But goa allows map keys to be anything.
	r := reflect.ValueOf(v)
	if r.Kind() == reflect.Map {
		keys := r.MapKeys()
		if keys[0].Kind() != reflect.String {
			a := make(map[string]any, len(keys))
			var kstr string
			for _, k := range keys {
				switch t := k.Interface().(type) {
				case bool:
					kstr = strconv.FormatBool(t)
				case int32:
					kstr = strconv.FormatInt(int64(t), 10)
				case int64:
					kstr = strconv.FormatInt(t, 10)
				case int:
					kstr = strconv.Itoa(t)
				case float32:
					kstr = strconv.FormatFloat(float64(t), 'f', -1, 32)
				case float64:
					kstr = strconv.FormatFloat(t, 'f', -1, 64)
				default:
					kstr = k.String()
				}
				a[kstr] = r.MapIndex(k).Interface()
			}
			v = a
		}
	}
	b, err := json.MarshalIndent(v, "   ", "   ")
	ex := "?"
	if err == nil {
		ex = string(b)
	}
	if strings.Contains(ex, "\n") {
		ex = "'" + strings.ReplaceAll(ex, "'", "\\'") + "'"
	}
	return ex
}

var (
	boolN    = codegen.GoNativeTypeName(expr.Boolean)