GO Clean用法及代碼示例

GO語言"path"包中"Clean"函數的用法及代碼示例。

用法:

func Clean(path string) string

Clean 通過純詞法處理返回與 path 等效的最短路徑名。它迭代地應用以下規則，直到無法進行進一步處理：

1. Replace multiple slashes with a single slash.
2. Eliminate each . path name element (the current directory).
3. Eliminate each inner .. path name element (the parent directory)
   along with the non-.. element that precedes it.
4. Eliminate .. elements that begin a rooted path:
   that is, replace "/.." by "/" at the beginning of a path.

僅當返回的路徑是根 "/" 時，返回的路徑才以斜線結尾。

如果此過程的結果是空字符串，則 Clean 返回字符串 "."。

另請參見 Rob Pike，“計劃 9 中的詞法文件名或獲取 Dot-Dot 正確”，https://9p.io/sys/doc/lexnames.html

package main

import (
	"fmt"
	"path"
)

func main() {
	paths := []string{
		"a/c",
		"a//c",
		"a/c/.",
		"a/c/b/..",
		"/../a/c",
		"/../a/b/../././/c",
		"",
	}

	for _, p := range paths {
		fmt.Printf("Clean(%q) = %q\n", p, path.Clean(p))
	}

}

Clean("a/c") = "a/c"
Clean("a//c") = "a/c"
Clean("a/c/.") = "a/c"
Clean("a/c/b/..") = "a/c"
Clean("/../a/c") = "/a/c"
Clean("/../a/b/../././/c") = "/a/c"
Clean("") = "."