75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package filepath
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import (
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"fmt"
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"strings"
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)
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// Clean is an explicit-OS version of path/filepath's Clean.
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func Clean(os, path string) string {
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abs := IsAbs(os, path)
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sep := Separator(os)
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elements := strings.Split(path, string(sep))
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// Replace multiple Separator elements with a single one.
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for i := 0; i < len(elements); i++ {
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if len(elements[i]) == 0 {
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elements = append(elements[:i], elements[i+1:]...)
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i--
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}
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}
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// Eliminate each . path name element (the current directory).
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for i := 0; i < len(elements); i++ {
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if elements[i] == "." && len(elements) > 1 {
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elements = append(elements[:i], elements[i+1:]...)
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i--
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}
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}
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// Eliminate each inner .. path name element (the parent directory)
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// along with the non-.. element that precedes it.
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for i := 1; i < len(elements); i++ {
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if i == 1 && abs && sep == '\\' {
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continue
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}
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if i > 0 && elements[i] == ".." {
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elements = append(elements[:i-1], elements[i+1:]...)
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i -= 2
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}
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}
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// Eliminate .. elements that begin a rooted path:
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// that is, replace "/.." by "/" at the beginning of a path,
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// assuming Separator is '/'.
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offset := 0
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if sep == '\\' {
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offset = 1
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}
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if abs {
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for len(elements) > offset && elements[offset] == ".." {
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elements = append(elements[:offset], elements[offset+1:]...)
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}
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}
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cleaned := strings.Join(elements, string(sep))
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if abs {
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if sep == '/' {
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cleaned = fmt.Sprintf("%c%s", sep, cleaned)
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} else if len(elements) == 1 {
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cleaned = fmt.Sprintf("%s%c", cleaned, sep)
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}
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}
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// If the result of this process is an empty string, Clean returns
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// the string ".".
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if len(cleaned) == 0 {
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cleaned = "."
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}
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if cleaned == path {
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return path
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}
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return Clean(os, cleaned)
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}
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