fix: incorrect checking of strings.Split return value

strings.Split will never return a slice of length 0 if sep is not empty, so any code that checks if the return value is of length 0 is incorrect and useless.

component/geodata/utils.go

@@ -1,7 +1,6 @@
 package geodata
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
@@ -76,13 +75,13 @@ func LoadGeoSiteMatcher(countryCode string) (router.DomainMatcher, error) {
 	if countryCode[0] == '!' {
 		not = true
 		countryCode = countryCode[1:]
+		if countryCode == "" {
+			return nil, fmt.Errorf("country code could not be empty")
+		}
 	}
 	countryCode = strings.ToLower(countryCode)
 
 	parts := strings.Split(countryCode, "@")
-	if len(parts) == 0 {
-		return nil, errors.New("empty rule")
-	}
 	listName := strings.TrimSpace(parts[0])
 	attrVal := parts[1:]
 	attrs := parseAttrs(attrVal)

config/config.go

@@ -1174,8 +1174,6 @@ func parseNameServer(servers []string, respectRules bool, preferH3 bool) ([]dns.
 		for _, s := range strings.Split(u.Fragment, "&") {
 			arr := strings.SplitN(s, "=", 2)
 			switch len(arr) {
-			case 0:
-				continue
 			case 1:
 				proxyName = arr[0]
 			case 2:

rules/common/in_name.go

@@ -2,8 +2,9 @@ package common
 
 import (
 	"fmt"
-	C "github.com/metacubex/mihomo/constant"
 	"strings"
+
+	C "github.com/metacubex/mihomo/constant"
 )
 
 type InName struct {
@@ -36,8 +37,12 @@ func (u *InName) Payload() string {
 
 func NewInName(iNames, adapter string) (*InName, error) {
 	names := strings.Split(iNames, "/")
-	if len(names) == 0 {
-		return nil, fmt.Errorf("in name couldn't be empty")
+	for i, name := range names {
+		name = strings.TrimSpace(name)
+		if len(name) == 0 {
+			return nil, fmt.Errorf("in name couldn't be empty")
+		}
+		names[i] = name
 	}
 
 	return &InName{

rules/common/in_type.go

@@ -2,8 +2,9 @@ package common
 
 import (
 	"fmt"
-	C "github.com/metacubex/mihomo/constant"
 	"strings"
+
+	C "github.com/metacubex/mihomo/constant"
 )
 
 type InType struct {
@@ -36,8 +37,12 @@ func (u *InType) Payload() string {
 
 func NewInType(iTypes, adapter string) (*InType, error) {
 	types := strings.Split(iTypes, "/")
-	if len(types) == 0 {
-		return nil, fmt.Errorf("in type couldn't be empty")
+	for i, tp := range types {
+		tp = strings.TrimSpace(tp)
+		if len(tp) == 0 {
+			return nil, fmt.Errorf("in type couldn't be empty")
+		}
+		types[i] = tp
 	}
 
 	tps, err := parseInTypes(types)

rules/common/in_user.go

@@ -2,8 +2,9 @@ package common
 
 import (
 	"fmt"
-	C "github.com/metacubex/mihomo/constant"
 	"strings"
+
+	C "github.com/metacubex/mihomo/constant"
 )
 
 type InUser struct {
@@ -36,8 +37,12 @@ func (u *InUser) Payload() string {
 
 func NewInUser(iUsers, adapter string) (*InUser, error) {
 	users := strings.Split(iUsers, "/")
-	if len(users) == 0 {
-		return nil, fmt.Errorf("in user couldn't be empty")
+	for i, user := range users {
+		user = strings.TrimSpace(user)
+		if len(user) == 0 {
+			return nil, fmt.Errorf("in user couldn't be empty")
+		}
+		users[i] = user
 	}
 
 	return &InUser{