根据循环内的子字符串匹配填充结构

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问题内容

如果我们看一下下面的代码，我们如何用从字符串切片中获取的值填充结构变量？ https://go.dev/play/p/kkcpzr5r28w

package main

import (
    "fmt"
    "os"
    "strings"
)

type config struct {
    operation string
    stop      string
    start     string
    file      string
}

func parseconfig(list []string) config {

    var c config
    for _, elem := range list {
        if strings.contains(elem, "op:") {
            sublist := strings.splitaftern(elem, ":", 2)
            c.operation = sublist[1]
        } else if strings.contains(elem, "stop:") {
            sublist := strings.splitaftern(elem, ":", 2)
            c.stop = sublist[1]
        } else if strings.contains(elem, "start:") {
            sublist := strings.splitaftern(elem, ":", 2)
            c.start = sublist[1]
        } else if strings.contains(elem, "file:") {
            sublist := strings.splitaftern(elem, ":", 2)
            c.file = sublist[1]
        }
    }
    return c
}

func main() {

    c := parseconfig(os.args[1:])
    fmt.println(c) // {count the  quick /tmp/file1.txt}
}

使用这些参数调用时，该程序不会返回正确的响应：

go run scan.go op:count start:quick stop:the file:/tmp/file1.txt

我想知道出了什么问题？重构代码来解决问题的最佳方法是什么？

正确答案

希望我已经解决了这个问题，感谢 gophers 社区：https://go.dev/play/p/u_Dc7ctbsib

package main

import (
    "fmt"
    "strings"
)

type Config struct {
    Operation string
    Stop      string
    Start     string
    File      string
}

func main() {
    list := []string{"op:count", "start:quick", "stop:the", "file:/tmp/file1.txt"}
    fmt.Println(list)
    var c Config
    for _, v := range list {
        if strings.HasPrefix(v, "op:") {
            subList := strings.SplitAfterN(v, ":", 2)
            c.Operation = subList[1]
        } else if strings.Contains(v, "stop:") {
            subList := strings.SplitAfterN(v, ":", 2)
            c.Stop = subList[1]
        } else if strings.Contains(v, "start:") {
            subList := strings.SplitAfterN(v, ":", 2)
            c.Start = subList[1]
        } else if strings.Contains(v, "file:") {
            subList := strings.SplitAfterN(v, ":", 2)
            c.File = subList[1]
        }
    }
    fmt.Println(c) // {count the  quick /tmp/file1.txt}

}

Due to the fact that "stop:the" also wrongly matches "op:"，operation 最终设置为“the”而不是“count”。现在问题似乎已经解决，strings.contains 已替换为 strings.hasprefix。

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