diff options
Diffstat (limited to 'src/vendor/github.com/julienschmidt/httprouter/path.go')
| -rw-r--r-- | src/vendor/github.com/julienschmidt/httprouter/path.go | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/src/vendor/github.com/julienschmidt/httprouter/path.go b/src/vendor/github.com/julienschmidt/httprouter/path.go deleted file mode 100644 index 486134d..0000000 --- a/src/vendor/github.com/julienschmidt/httprouter/path.go +++ /dev/null @@ -1,123 +0,0 @@ -// Copyright 2013 Julien Schmidt. All rights reserved. -// Based on the path package, Copyright 2009 The Go Authors. -// Use of this source code is governed by a BSD-style license that can be found -// in the LICENSE file. - -package httprouter - -// CleanPath is the URL version of path.Clean, it returns a canonical URL path -// for p, eliminating . and .. elements. -// -// The following rules are applied iteratively until no further processing can -// be done: -// 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. -// -// If the result of this process is an empty string, "/" is returned -func CleanPath(p string) string { - // Turn empty string into "/" - if p == "" { - return "/" - } - - n := len(p) - var buf []byte - - // Invariants: - // reading from path; r is index of next byte to process. - // writing to buf; w is index of next byte to write. - - // path must start with '/' - r := 1 - w := 1 - - if p[0] != '/' { - r = 0 - buf = make([]byte, n+1) - buf[0] = '/' - } - - trailing := n > 2 && p[n-1] == '/' - - // A bit more clunky without a 'lazybuf' like the path package, but the loop - // gets completely inlined (bufApp). So in contrast to the path package this - // loop has no expensive function calls (except 1x make) - - for r < n { - switch { - case p[r] == '/': - // empty path element, trailing slash is added after the end - r++ - - case p[r] == '.' && r+1 == n: - trailing = true - r++ - - case p[r] == '.' && p[r+1] == '/': - // . element - r++ - - case p[r] == '.' && p[r+1] == '.' && (r+2 == n || p[r+2] == '/'): - // .. element: remove to last / - r += 2 - - if w > 1 { - // can backtrack - w-- - - if buf == nil { - for w > 1 && p[w] != '/' { - w-- - } - } else { - for w > 1 && buf[w] != '/' { - w-- - } - } - } - - default: - // real path element. - // add slash if needed - if w > 1 { - bufApp(&buf, p, w, '/') - w++ - } - - // copy element - for r < n && p[r] != '/' { - bufApp(&buf, p, w, p[r]) - w++ - r++ - } - } - } - - // re-append trailing slash - if trailing && w > 1 { - bufApp(&buf, p, w, '/') - w++ - } - - if buf == nil { - return p[:w] - } - return string(buf[:w]) -} - -// internal helper to lazily create a buffer if necessary -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 -} |
