尝试增加tab列表对齐功能（暂未成功）

pom.xml

@@ -6,7 +6,7 @@
 
   <groupId>cn.lunadeer</groupId>
   <artifactId>EssentialsD</artifactId>
-    <version>2.3.0</version>
+    <version>2.3.1</version>
   <packaging>jar</packaging>
 
   <name>EssentialsD</name>

src/main/java/cn/lunadeer/essentialsd/managers/TabListUpdater.java

@@ -6,6 +6,11 @@ import me.clip.placeholderapi.PlaceholderAPI;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
 public class TabListUpdater {
 
     public static TabListUpdater instance;
@@ -16,9 +21,47 @@ public class TabListUpdater {
     }
 
     private void update() {
-        for (Player player : Bukkit.getOnlinePlayers()) {
+        Collection<? extends Player> players = Bukkit.getOnlinePlayers();
+        Map<UUID, String> formatedNames = new HashMap<>();
+
+        int longestFormatedStringLength = 0;
+
+        for (Player player : players) {
             String formated = PlaceholderAPI.setPlaceholders(player, EssentialsD.config.getPrefixTabFormat());
-            player.setPlayerListName(formated);
+            if (length(formated) > longestFormatedStringLength) {
+                longestFormatedStringLength = length(formated);
+            }
+            formatedNames.put(player.getUniqueId(), formated);
+        }
+        // <span> 将会被替换为填充空格 " " 用于保证长度一致
+        for (Player player : players) {
+            String formated = formatedNames.get(player.getUniqueId());
+            int formatedLength = length(formated);
+            int spaceLength = longestFormatedStringLength - formatedLength;
+            StringBuilder space = new StringBuilder();
+            for (int i = 0; i < spaceLength; i++) {
+                space.append(" ");
+            }
+            player.setPlayerListName(formated.replace("<span>", space.toString()));
         }
     }
+
+    private static int length(String value) {
+        int valueLength = 0;
+        String chinese = "[\u0391-\uFFE5]";
+        /* 获取字段值的长度，如果含中文字符，则每个中文字符长度为2，否则为1 */
+        for (int i = 0; i < value.length(); i++) {
+            /* 获取一个字符 */
+            String temp = value.substring(i, i + 1);
+            /* 判断是否为中文字符 */
+            if (temp.matches(chinese)) {
+                /* 中文字符长度为2 */
+                valueLength += 2;
+            } else {
+                /* 其他字符长度为1 */
+                valueLength += 1;
+            }
+        }
+        return valueLength;
+    }
 }