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package filepath
import (
"os"
"strings"
"syscall"
)
// HasPrefix exists for historical compatibility and should not be used.
//
// Deprecated: HasPrefix does not respect path boundaries and
// does not ignore case when required.
func HasPrefix(p, prefix string) bool {
if strings.HasPrefix(p, prefix) {
return true
}
return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix))
}
func splitList(path string) []string {
// The same implementation is used in LookPath in os/exec;
// consider changing os/exec when changing this.
if path == "" {
return []string{}
}
// Split path, respecting but preserving quotes.
list := []string{}
start := 0
quo := false
for i := 0; i < len(path); i++ {
switch c := path[i]; {
case c == '"':
quo = !quo
case c == ListSeparator && !quo:
list = append(list, path[start:i])
start = i + 1
}
}
list = append(list, path[start:])
// Remove quotes.
for i, s := range list {
list[i] = strings.ReplaceAll(s, `"`, ``)
}
return list
}
func abs(path string) (string, error) {
if path == "" {
// syscall.FullPath returns an error on empty path, because it's not a valid path.
// To implement Abs behavior of returning working directory on empty string input,
// special-case empty path by changing it to "." path. See golang.org/issue/24441.
path = "."
}
fullPath, err := syscall.FullPath(path)
if err != nil {
return "", err
}
return Clean(fullPath), nil
}
func join(elem []string) string {
var b strings.Builder
var lastChar byte
for _, e := range elem {
switch {
case b.Len() == 0:
// Add the first non-empty path element unchanged.
case os.IsPathSeparator(lastChar):
// If the path ends in a slash, strip any leading slashes from the next
// path element to avoid creating a UNC path (any path starting with "\\")
// from non-UNC elements.
//
// The correct behavior for Join when the first element is an incomplete UNC
// path (for example, "\\") is underspecified. We currently join subsequent
// elements so Join("\\", "host", "share") produces "\\host\share".
for len(e) > 0 && os.IsPathSeparator(e[0]) {
e = e[1:]
}
// If the path is \ and the next path element is ??,
// add an extra .\ to create \.\?? rather than \??\
// (a Root Local Device path).
if b.Len() == 1 && strings.HasPrefix(e, "??") && (len(e) == len("??") || os.IsPathSeparator(e[2])) {
b.WriteString(`.\`)
}
case lastChar == ':':
// If the path ends in a colon, keep the path relative to the current directory
// on a drive and don't add a separator. Preserve leading slashes in the next
// path element, which may make the path absolute.
//
// Join(`C:`, `f`) = `C:f`
// Join(`C:`, `\f`) = `C:\f`
default:
// In all other cases, add a separator between elements.
b.WriteByte('\\')
lastChar = '\\'
}
if len(e) > 0 {
b.WriteString(e)
lastChar = e[len(e)-1]
}
}
if b.Len() == 0 {
return ""
}
return Clean(b.String())
}
func sameWord(a, b string) bool {
return strings.EqualFold(a, b)
}
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