Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.
In a UNIX-style file system, a period . refers to the current directory. Furthermore, a double period … moves the directory up a level. For more information, see: Absolute path vs relative path in Linux/Unix
Note that the returned canonical path must always begin with a slash /, and there must be only a single slash / between two directory names. The last directory name (if it exists) must not end with a trailing /. Also, the canonical path must be the shortest string representing the absolute path.
Example 1:
Input: “/home/”
Output: “/home”
Explanation: Note that there is no trailing slash after the last directory name.
Example 2:
Input: “/…/”
Output: “/”
Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go.
Example 3:
Input: “/home//foo/”
Output: “/home/foo”
Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one.
Example 4:
Input: “/a/./b/…/…/c/”
Output: “/c”
Example 5:
Input: “/a/…/…/b/…/c//.//”
Output: “/c”
Example 6:
Input: “/a//b////c/d//././/…”
Output: “/a/b/c”
func simplifyPath(path string) string {
reg, _ := regexp.Compile("/+")
dirs := reg.Split(path, -1)
res := []string{}
for _, v := range dirs {
p := string(v)
if p == ".." {
if len(res) > 0 {
res = res[:len(res)-1]
}
} else if p != "." && p != "" {
res = append(res, p)
}
}
str := strings.Join(res, "/")
return "/" + str
}
