update

Author: admpub

file.go

@@ -118,6 +118,7 @@ func HasPathSeperatorSuffix(ppath string) bool {
 }
 
 var pathSeperatorRegex = regexp.MustCompile(`(\\|/)`)
+var winPathSeperatorRegex = regexp.MustCompile(`[\\]+`)
 
 func GetPathSeperator(ppath string) string {
 	matches := pathSeperatorRegex.FindAllStringSubmatch(ppath, 1)
@@ -127,6 +128,53 @@ func GetPathSeperator(ppath string) string {
 	return ``
 }
 
+func RealPath(fullPath string) string {
+	if len(fullPath) == 0 {
+		return fullPath
+	}
+	var root string
+	var pathSeperator string
+	if strings.HasPrefix(fullPath, `/`) {
+		pathSeperator = `/`
+	} else {
+		pathSeperator = GetPathSeperator(fullPath)
+		if pathSeperator == `/` {
+			fullPath = `/` + fullPath
+		} else {
+			cleanedFullPath := winPathSeperatorRegex.ReplaceAllString(fullPath, `\`)
+			parts := strings.SplitN(cleanedFullPath, `\`, 2)
+			if !strings.HasSuffix(parts[0], `:`) {
+				if len(parts[0]) > 0 {
+					parts[0] = `c:\` + parts[0]
+				} else {
+					parts[0] = `c:`
+				}
+			}
+			root = parts[0] + `\`
+			if len(parts) != 2 {
+				return fullPath
+			}
+			fullPath = parts[1]
+		}
+	}
+	parts := pathSeperatorRegex.Split(fullPath, -1)
+	result := make([]string, 0, len(parts))
+	for _, part := range parts {
+		if part == `.` {
+			continue
+		}
+		if part == `..` {
+			if len(result) <= 1 {
+				continue
+			}
+			result = result[0 : len(result)-1]
+			continue
+		}
+		result = append(result, part)
+	}
+	return root + strings.Join(result, pathSeperator)
+}
+
 func SplitFileDirAndName(ppath string) (dir string, name string) {
 	if len(ppath) == 0 {
 		return

file_test.go

@@ -75,3 +75,26 @@ func TestSplitFileDirAndName(t *testing.T) {
 	sep = GetPathSeperator(`dfefe\ffefe`)
 	assert.Equal(t, `\`, sep)
 }
+
+func TestRealPath(t *testing.T) {
+	ppath := RealPath(`/abc/../dd.txt`)
+	assert.Equal(t, `/dd.txt`, ppath)
+
+	ppath = RealPath(`/../dd.txt`)
+	assert.Equal(t, `/dd.txt`, ppath)
+
+	ppath = RealPath(`c:\..\dd.txt`)
+	assert.Equal(t, `c:\dd.txt`, ppath)
+	ppath = RealPath(`c:\\..\\dd.txt`)
+	assert.Equal(t, `c:\dd.txt`, ppath)
+
+	ppath = RealPath(`\\dd.txt`)
+	assert.Equal(t, `c:\dd.txt`, ppath)
+	ppath = RealPath(`a\b\dd.txt`)
+	assert.Equal(t, `c:\a\b\dd.txt`, ppath)
+	ppath = RealPath(`dd.txt`)
+	assert.Equal(t, `dd.txt`, ppath)
+
+	ppath = RealPath(`c:\a\b\c\..`)
+	assert.Equal(t, `c:\a\b`, ppath)
+}