纵梁工具是否有“反向”功能？

Question

在 go 中，我可以使用stringer将 const 名称转换为字符串：

//go:generate stringer -type=M

type M int

const (

    _ M = iota

    Foo // "Foo"

    Bar // "Bar"

)

除了手写开关之外，还有什么可以让我将"foo"字符串转换为类型变量的吗？M

Answer 1

找到了一种方法，但它仍然是半手动的。通过使用 stringer 创建的映射切片，也可以搜索它以反转操作：type Measurement intconst (&nbsp; &nbsp; invalidMeasurement Measurement = iota&nbsp; &nbsp; Meters&nbsp; &nbsp; Liters&nbsp; &nbsp; Pounds)// Works with golang.org/x/tools/cmd/stringer// v0.0.0-20200925191224-5d1fdd8fa346func UnString(s string) Measurement {&nbsp; &nbsp; s = strings.ToLower(s)&nbsp; &nbsp; l := strings.ToLower(_Measurement_name)&nbsp; &nbsp; for i := 0; i < len(_Measurement_index)-1; i++ {&nbsp; &nbsp; &nbsp; &nbsp; if s == l[_Measurement_index[i]:_Measurement_index[i+1]] {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return Measurement(i)&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; //&nbsp;&nbsp; &nbsp; return Measurement(0)}

Answer 2

我最近发现了https://github.com/alvaroloes/enumer，它添加了一个TypeString(string) Type方法，可以将字符串值转换为类型并且可以替换stringer.