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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package filepath
import (
"strings"
)
// A substantial portion of this code comes from the Go stdlib code.
const (
WindowsSeparator = '\\' // OS-specific path separator
WindowsListSeparator = ';' // OS-specific path list separator
)
// WindowsRenderer is a Renderer implementation for Windows.
type WindowsRenderer struct{}
// Base implements Renderer.
func (ur WindowsRenderer) Base(path string) string {
return Base(WindowsSeparator, ur.VolumeName, path)
}
// Clean implements Renderer.
func (ur WindowsRenderer) Clean(path string) string {
return Clean(WindowsSeparator, ur.VolumeName, path)
}
// Dir implements Renderer.
func (ur WindowsRenderer) Dir(path string) string {
return Dir(WindowsSeparator, ur.VolumeName, path)
}
// Ext implements Renderer.
func (WindowsRenderer) Ext(path string) string {
return Ext(WindowsSeparator, path)
}
// FromSlash implements Renderer.
func (WindowsRenderer) FromSlash(path string) string {
return FromSlash(WindowsSeparator, path)
}
// IsAbs implements Renderer.
func (WindowsRenderer) IsAbs(path string) bool {
l := volumeNameLen(path)
if l == 0 {
return false
}
path = path[l:]
if path == "" {
return false
}
return isSlash(path[0])
}
// Join implements Renderer.
func (ur WindowsRenderer) Join(path ...string) string {
return Join(WindowsSeparator, ur.VolumeName, path...)
}
// Match implements Renderer.
func (WindowsRenderer) Match(pattern, name string) (matched bool, err error) {
return Match(WindowsSeparator, pattern, name)
}
// Split implements Renderer.
func (ur WindowsRenderer) Split(path string) (dir, file string) {
return Split(WindowsSeparator, ur.VolumeName, path)
}
// SplitList implements Renderer.
func (WindowsRenderer) SplitList(path string) []string {
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 == WindowsListSeparator && !quo:
list = append(list, path[start:i])
start = i + 1
}
}
list = append(list, path[start:])
// Remove quotes.
for i, s := range list {
if strings.Contains(s, `"`) {
list[i] = strings.Replace(s, `"`, ``, -1)
}
}
return list
}
// ToSlash implements Renderer.
func (WindowsRenderer) ToSlash(path string) string {
return ToSlash(WindowsSeparator, path)
}
// VolumeName implements Renderer.
func (WindowsRenderer) VolumeName(path string) string {
return path[:volumeNameLen(path)]
}
// NormCase implements Renderer.
func (WindowsRenderer) NormCase(path string) string {
return strings.ToLower(path)
}
// SplitSuffix implements Renderer.
func (WindowsRenderer) SplitSuffix(path string) (string, string) {
return splitSuffix(path)
}
func isSlash(c uint8) bool {
return c == WindowsSeparator || c == '/'
}
// volumeNameLen returns length of the leading volume name on Windows.
// It returns 0 elsewhere.
func volumeNameLen(path string) int {
if len(path) < 2 {
return 0
}
// with drive letter
c := path[0]
if path[1] == ':' && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
return 2
}
// is it UNC
if l := len(path); l >= 5 && isSlash(path[0]) && isSlash(path[1]) &&
!isSlash(path[2]) && path[2] != '.' {
// first, leading `\\` and next shouldn't be `\`. its server name.
for n := 3; n < l-1; n++ {
// second, next '\' shouldn't be repeated.
if isSlash(path[n]) {
n++
// third, following something characters. its share name.
if !isSlash(path[n]) {
if path[n] == '.' {
break
}
for ; n < l; n++ {
if isSlash(path[n]) {
break
}
}
return n
}
break
}
}
}
return 0
}
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