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path.go
87 lines (69 loc) · 1.06 KB
/
path.go
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package goku
func CleanPath(p string) string {
if p == "" {
return "/"
}
n := len(p)
var buf []byte
r := 1
w := 1
if p[0] != '/' {
r = 0
buf = make([]byte, n+1)
buf[0] = '/'
}
trailing := n > 1 && p[n-1] == '/'
for r < n {
switch {
case p[r] == '/':
r++
case p[r] == '.' && r+1 == n:
trailing = true
r++
case p[r] == '.' && p[r+1] == '/':
r++
case p[r] == '.' && p[r+1] == '.' && (r+2 == n || p[r+2] == '/'):
r += 2
if w > 1 {
w--
if buf == nil {
for w > 1 && p[w] != '/' {
w--
}
} else {
for w > 1 && buf[w] != '/' {
w--
}
}
}
default:
if w > 1 {
bufApp(&buf, p, w, '/')
w++
}
for r < n && p[r] != '/' {
bufApp(&buf, p, w, p[r])
w++
r++
}
}
}
if trailing && w > 1 {
bufApp(&buf, p, w, '/')
w++
}
if buf == nil {
return p[:w]
}
return string(buf[:w])
}
func bufApp(buf *[]byte, s string, w int, c byte) {
if *buf == nil {
if s[w] == c {
return
}
*buf = make([]byte, len(s))
copy(*buf, s[:w])
}
(*buf)[w] = c
}