| // Copyright 2010 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package filepath |
| |
| import "strings" |
| |
| // IsAbs returns true if the path is absolute. |
| func IsAbs(path string) (b bool) { |
| v := VolumeName(path) |
| if v == "" { |
| return false |
| } |
| path = path[len(v):] |
| if path == "" { |
| return false |
| } |
| return path[0] == '/' || path[0] == '\\' |
| } |
| |
| // VolumeName returns leading volume name. |
| // Given "C:\foo\bar" it returns "C:" under windows. |
| // On other platforms it returns "". |
| func VolumeName(path string) (v string) { |
| if len(path) < 2 { |
| return "" |
| } |
| // with drive letter |
| c := path[0] |
| if path[1] == ':' && |
| ('0' <= c && c <= '9' || 'a' <= c && c <= 'z' || |
| 'A' <= c && c <= 'Z') { |
| return path[:2] |
| } |
| return "" |
| } |
| |
| // HasPrefix tests whether the path p begins with prefix. |
| // It ignores case while comparing. |
| func HasPrefix(p, prefix string) bool { |
| if strings.HasPrefix(p, prefix) { |
| return true |
| } |
| return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix)) |
| } |