duanjia3187 2015-05-11 20:45
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如何在Go中打印“枚举”的字符串表示形式?

I've looked at the various official sources for how to do this but I can't find it. Imagine you have the following enum (I know golang doesn't have enums in the classic sense):

package main

import "fmt"

type LogLevel int

const (
    Off LogLevel = iota
    Debug
)

var level LogLevel = Debug

func main() {
    fmt.Printf("Log Level: %s", level)
}

The closest I can get with the above %s, which gives me:

Log Level: %!s(main.LogLevel=1)

I would like to have:

Log Level: Debug

Can anyone help me?

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  • douningzhi1991 2015-05-11 20:51
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    You can't directly within the language, but there's a tool for generating the supporting code: golang.org/x/tools/cmd/stringer

    From the example in the stringer docs

    type Pill int
    
    const (
        Placebo Pill = iota
        Aspirin
        Ibuprofen
        Paracetamol
        Acetaminophen = Paracetamol
    )
    

    Would produce code like

    const _Pill_name = "PlaceboAspirinIbuprofenParacetamol"
    
    var _Pill_index = [...]uint8{0, 7, 14, 23, 34}
    
    func (i Pill) String() string {
        if i < 0 || i+1 >= Pill(len(_Pill_index)) {
            return fmt.Sprintf("Pill(%d)", i)
        }
        return _Pill_name[_Pill_index[i]:_Pill_index[i+1]]
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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