提问人：sci9 提问时间：2/18/2023 最后编辑：Robsci9 更新时间：2/19/2023 访问量：97
根据循环中的子字符串匹配填充结构
Filling a struct based on substring matches within a loop
问：
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来填充结构变量？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}
}
使用以下参数调用时，此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
我想知道怎么了？重构代码以解决问题的最佳方法是什么？
答：
0赞
sci9
2/19/2023
#1
希望我已经修复了它，感谢 Gophers 的社区：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}
}
由于“stop：the”也错误地匹配了“op：”，因此最终设置为“the”而不是“count”。现在问题似乎解决了，它被替换为 .Operationstrings.Containsstrings.HasPrefix
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