Add missing Javadoc comments

Remove testCharsReplacerHandlesEscapedHex()

.github/label-commenter-config.yml

@@ -38,8 +38,9 @@ labels:
           - Currently used Versions of your server and PlaceholderAPI
           - Currently installed Expansions
           - Currently installed Plugins
+          - Any additional information requested by users in this issue.
           
-          The easiest way to provide those information is through the `/papi dumb` command which posts the required information to https://paste.helpch.at and gives a URL to share.
+          The easiest way to provide those information is through the `/papi dump` command which posts the required information to https://paste.helpch.at and gives a URL to share.
     unlabeled:
       issue:
         body: |-
@@ -76,6 +77,15 @@ labels:
           
           Don't hesitate to ask us any questions.
         action: close
+  - name: 'Type: Invalid (Wiki)'
+    labeled:
+      pr:
+        body: |-
+          Your Wiki Pull request has been marked as **invalid**.
+          
+          Pull requests targeting the wiki need to be based of and target the `docs/wiki` branch of this repository.
+          More information can be found on the [Wiki README](https://github.com/PlaceholderAPI/PlaceholderAPI/blob/docs/wiki/wiki/README.md).
+        action: close
   - name: 'Target: Wiki'
     labeled:
       issue:

README.md

@@ -28,9 +28,9 @@
 # Information 
 [PlaceholderAPI][spigot] is a plugin for Spigot servers that allows server owners to display information from various plugins with a uniform format. 
 
-Support for specific plugins are provided either by the plugin itself or through expansions. The expansions may be downloaded in-game through the PAPI Expansion Cloud. There are currently over 150+ expansions that support a wide variety of plugins, such as Essentials, Factions, LuckPerms, and Vault. 
+Support for specific plugins are provided either by the plugin itself or through expansions. The expansions may be downloaded in-game through the PAPI Expansion Cloud. There are currently over 240+ expansions that support a wide variety of plugins, such as Essentials, Factions, LuckPerms, and Vault. 
 
-PlaceholderAPI has been downloaded over 750,000 times and has been used concurrently on over 35,000 servers, which makes it a must-have for a server of any type or scale.
+PlaceholderAPI has been downloaded over 1,000,000 times and has been used concurrently on over 40,000 servers, which makes it a must-have for a server of any type or scale.
 
 ## Contribute
 If you would like to contribute towards PlaceholderAPI should you take a look at our [Contributing file][contributing] for the ins and outs on how you can do that and what you need to keep in mind.

build.gradle

@@ -8,7 +8,7 @@ plugins {
 }
 
 group "me.clip"
-version "2.11.0"
+version "2.11.2-DEV-${System.getProperty("BUILD_NUMBER")}"
 
 description "An awesome placeholder provider!"
 
@@ -32,7 +32,7 @@ dependencies {
     testImplementation "org.openjdk.jmh:jmh-core:1.32"
     testImplementation "org.openjdk.jmh:jmh-generator-annprocess:1.32"
 
-    testImplementation "org.junit.jupiter:junit-jupiter-engine:5.8.1"
+    testImplementation "org.junit.jupiter:junit-jupiter-engine:5.8.2"
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.8.1"
 }
 

src/main/java/me/clip/placeholderapi/PlaceholderAPI.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -22,6 +22,7 @@ package me.clip.placeholderapi;
 
 import com.google.common.collect.ImmutableSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.regex.Matcher;
@@ -185,7 +186,7 @@ public final class PlaceholderAPI {
         continue;
       }
 
-      String identifier = format.substring(0, index).toLowerCase();
+      String identifier = format.substring(0, index).toLowerCase(Locale.ROOT);
       String params = format.substring(index + 1);
       final PlaceholderExpansion expansion = PlaceholderAPIPlugin.getInstance()
           .getLocalExpansionManager().getExpansion(identifier);
@@ -292,14 +293,14 @@ public final class PlaceholderAPI {
   // === Deprecated API ===
 
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean registerExpansion(PlaceholderExpansion expansion)
   {
     return expansion.register();
   }
 
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean unregisterExpansion(PlaceholderExpansion expansion)
   {
     return expansion.unregister();
@@ -313,7 +314,7 @@ public final class PlaceholderAPI {
    * @return Map of registered placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static Map<String, PlaceholderHook> getPlaceholders() {
     return PlaceholderAPIPlugin.getInstance().getLocalExpansionManager()
         .getExpansions().stream()
@@ -329,7 +330,7 @@ public final class PlaceholderAPI {
    * @return always false
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean registerPlaceholderHook(Plugin plugin, PlaceholderHook placeholderHook) {
     PlaceholderAPIPlugin.getInstance().getLogger().warning(plugin.getName()
         + " is attempting to register placeholders via a PlaceholderHook class which is no longer supported!"
@@ -347,7 +348,7 @@ public final class PlaceholderAPI {
    * @return always false
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean registerPlaceholderHook(String identifier,
       PlaceholderHook placeholderHook) {
     PlaceholderAPIPlugin.getInstance().getLogger().warning(identifier
@@ -363,7 +364,7 @@ public final class PlaceholderAPI {
    * @return always false
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean unregisterPlaceholderHook(Plugin plugin) {
     PlaceholderAPIPlugin.getInstance().getLogger().warning(plugin.getName()
         + " is attempting to unregister placeholders via the PlaceholderAPI class which is no longer supported!"
@@ -380,7 +381,7 @@ public final class PlaceholderAPI {
    * @return always false
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static boolean unregisterPlaceholderHook(String identifier) {
     PlaceholderAPIPlugin.getInstance().getLogger().warning(identifier
         + " is attempting to unregister placeholders through the PlaceholderAPI class which is no longer supported!");
@@ -393,7 +394,7 @@ public final class PlaceholderAPI {
    * @return Set of registered identifiers
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static Set<String> getRegisteredPlaceholderPlugins() {
     return getRegisteredIdentifiers();
   }
@@ -404,7 +405,7 @@ public final class PlaceholderAPI {
    * @return always null
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static Set<String> getExternalPlaceholderPlugins() {
     return null;
   }
@@ -419,7 +420,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setPlaceholders(OfflinePlayer player,
       String text, Pattern pattern, boolean colorize) {
     return setPlaceholders(player, text);
@@ -435,7 +436,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setPlaceholders(OfflinePlayer player,
       List<String> text, Pattern pattern, boolean colorize) {
     return setPlaceholders(player, text);
@@ -450,7 +451,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setPlaceholders(OfflinePlayer player, List<String> text,
       boolean colorize) {
     return setPlaceholders(player, text);
@@ -465,7 +466,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setPlaceholders(OfflinePlayer player, List<String> text,
       Pattern pattern) {
     return setPlaceholders(player, text);
@@ -479,7 +480,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setPlaceholders(Player player, String text, boolean colorize) {
     return setPlaceholders(player, text);
   }
@@ -493,7 +494,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setPlaceholders(Player player, List<String> text, boolean colorize) {
     return setPlaceholders(player, text);
   }
@@ -507,7 +508,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setPlaceholders(OfflinePlayer player, String text, boolean colorize) {
     return setPlaceholders(player, text);
   }
@@ -521,7 +522,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setPlaceholders(OfflinePlayer player, String text, Pattern pattern) {
     return setPlaceholders(player, text);
   }
@@ -535,7 +536,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setBracketPlaceholders(OfflinePlayer player, List<String> text,
       boolean colorize) {
     return setBracketPlaceholders(player, text);
@@ -550,7 +551,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setBracketPlaceholders(OfflinePlayer player, String text, boolean colorize) {
     return setBracketPlaceholders(player, text);
   }
@@ -564,7 +565,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setBracketPlaceholders(Player player, String text, boolean colorize) {
     return setBracketPlaceholders(player, text);
   }
@@ -578,7 +579,7 @@ public final class PlaceholderAPI {
    * @return String with the parsed placeholders
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setBracketPlaceholders(Player player, List<String> text,
       boolean colorize) {
     return setBracketPlaceholders(player, text);
@@ -596,7 +597,7 @@ public final class PlaceholderAPI {
    * @deprecated Use {@link #setPlaceholders(OfflinePlayer, String)} instead.
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static String setRelationalPlaceholders(Player one, Player two, String text,
       boolean colorize) {
     return setRelationalPlaceholders(one, two, text);
@@ -614,7 +615,7 @@ public final class PlaceholderAPI {
    * @deprecated Use {@link #setRelationalPlaceholders(Player, Player, List)} instead.
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public static List<String> setRelationalPlaceholders(Player one, Player two, List<String> text,
       boolean colorize) {
     return setRelationalPlaceholders(one, two, text);

src/main/java/me/clip/placeholderapi/PlaceholderAPIPlugin.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/PlaceholderHook.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -25,8 +25,22 @@ import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+@Deprecated
 public abstract class PlaceholderHook {
+
+  /**
+   * Please see {@link me.clip.placeholderapi.expansion.PlaceholderExpansion#parsePlaceholders(OfflinePlayer, String) PlaceholderExpansion#parsePlaceholder(OfflinePlayer, String)}
+   * for a full description of what this method is used for.
+   * 
+   * @param player Possibly-null OfflinePlayer instance to use.
+   * @param params String after {@code %<expansion>_} and before the second percent symbol.
+   * @return Possibly-null String depending on the Expansions returned value.
+   * @deprecated Planned for removal in 2.14.0
+   *             <br>Please use {@link me.clip.placeholderapi.expansion.PlaceholderExpansion#parsePlaceholders(OfflinePlayer, String) parsePlaceholders(OfflinePlayer, String)}
+   *             instead
+   */
   @Nullable
+  @Deprecated
   public String onRequest(final OfflinePlayer player, @NotNull final String params) {
     if (player != null && player.isOnline()) {
       return onPlaceholderRequest((Player) player, params);
@@ -35,7 +49,20 @@ public abstract class PlaceholderHook {
     return onPlaceholderRequest(null, params);
   }
 
+  /**
+   * Please see {@link me.clip.placeholderapi.expansion.PlaceholderExpansion#parsePlaceholders(Player, String) PlaceholderExpansion#parsePlaceholder(Player, String)}
+   * for a full description of what this method is used for.
+   *
+   * @param player Possibly-null Player instance to use.
+   * @param params String after {@code %<expansion>_} and before the second percent symbol.
+   * @return Possibly-null String depending on the Expansions returned value.
+   * 
+   * @deprecated Planned for removal in 2.14.0
+   *             <br>Please use {@link me.clip.placeholderapi.expansion.PlaceholderExpansion#parsePlaceholders(Player, String) parsePlaceholders(Player, String)}
+   *             instead
+   */
   @Nullable
+  @Deprecated
   public String onPlaceholderRequest(final Player player, @NotNull final String params) {
     return null;
   }

src/main/java/me/clip/placeholderapi/commands/PlaceholderCommand.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -23,6 +23,7 @@ package me.clip.placeholderapi.commands;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Sets;
 import java.util.List;
+import java.util.Locale;
 import java.util.Set;
 import java.util.stream.Stream;
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
@@ -61,7 +62,7 @@ public abstract class PlaceholderCommand {
     if (parameter == null) {
       possible.forEach(suggestions::add);
     } else {
-      possible.filter(suggestion -> suggestion.toLowerCase().startsWith(parameter.toLowerCase()))
+      possible.filter(suggestion -> suggestion.toLowerCase(Locale.ROOT).startsWith(parameter.toLowerCase(Locale.ROOT)))
           .forEach(suggestions::add);
     }
   }

src/main/java/me/clip/placeholderapi/commands/PlaceholderCommandRouter.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -27,6 +27,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.stream.Stream;
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
@@ -95,7 +96,7 @@ public final class PlaceholderCommandRouter implements CommandExecutor, TabCompl
       return true;
     }
 
-    final String search = args[0].toLowerCase();
+    final String search = args[0].toLowerCase(Locale.ROOT);
     final PlaceholderCommand target = commands.get(search);
 
     if (target == null) {
@@ -121,10 +122,10 @@ public final class PlaceholderCommandRouter implements CommandExecutor, TabCompl
     final List<String> suggestions = new ArrayList<>();
 
     if (args.length > 1) {
-      final PlaceholderCommand target = this.commands.get(args[0].toLowerCase());
+      final PlaceholderCommand target = this.commands.get(args[0].toLowerCase(Locale.ROOT));
 
       if (target != null) {
-        target.complete(plugin, sender, args[0].toLowerCase(),
+        target.complete(plugin, sender, args[0].toLowerCase(Locale.ROOT),
             Arrays.asList(Arrays.copyOfRange(args, 1, args.length)), suggestions);
       }
 

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloud.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -24,6 +24,7 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.stream.Stream;
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
@@ -100,7 +101,7 @@ public final class CommandECloud extends PlaceholderCommand {
       return;
     }
 
-    final String search = params.get(0).toLowerCase();
+    final String search = params.get(0).toLowerCase(Locale.ROOT);
     final PlaceholderCommand target = commands.get(search);
 
     if (target == null) {
@@ -136,7 +137,7 @@ public final class CommandECloud extends PlaceholderCommand {
       return; // send sub commands
     }
 
-    final String search = params.get(0).toLowerCase();
+    final String search = params.get(0).toLowerCase(Locale.ROOT);
     final PlaceholderCommand target = commands.get(search);
 
     if (target == null) {

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudClear.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudDownload.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudExpansionInfo.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudExpansionList.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -87,7 +87,7 @@ public final class CommandECloudExpansionList extends PlaceholderCommand {
   @NotNull
   private static Collection<CloudExpansion> getExpansions(@NotNull final String target,
       @NotNull final PlaceholderAPIPlugin plugin) {
-    switch (target.toLowerCase()) {
+    switch (target.toLowerCase(Locale.ROOT)) {
       case "all":
         return plugin.getCloudExpansionManager().getCloudExpansions().values();
       case "installed":
@@ -112,7 +112,7 @@ public final class CommandECloudExpansionList extends PlaceholderCommand {
 
   public static void addExpansionTitle(@NotNull final StringBuilder builder,
       @NotNull final String target, final int page) {
-    switch (target.toLowerCase()) {
+    switch (target.toLowerCase(Locale.ROOT)) {
       case "all":
         builder.append("&bAll Expansions");
         break;

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudExpansionPlaceholders.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudRefresh.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudStatus.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudToggle.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -21,6 +21,8 @@
 package me.clip.placeholderapi.commands.impl.cloud;
 
 import java.util.List;
+import java.util.Locale;
+
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
 import me.clip.placeholderapi.commands.PlaceholderCommand;
 import me.clip.placeholderapi.util.Msg;
@@ -41,7 +43,7 @@ public final class CommandECloudToggle extends PlaceholderCommand {
     final boolean desiredState;
     final boolean currentState = plugin.getPlaceholderAPIConfig().isCloudEnabled();
 
-    switch (alias.toLowerCase()) {
+    switch (alias.toLowerCase(Locale.ROOT)) {
       case "enable":
         desiredState = true;
         break;

src/main/java/me/clip/placeholderapi/commands/impl/cloud/CommandECloudUpdate.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -23,6 +23,7 @@ package me.clip.placeholderapi.commands.impl.cloud;
 import com.google.common.collect.Lists;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
@@ -128,7 +129,7 @@ public final class CommandECloudUpdate extends PlaceholderCommand {
     installed.removeIf(expansion -> !expansion.shouldUpdate());
 
     if (!installed.isEmpty() && (params.isEmpty() || "all"
-        .startsWith(params.get(0).toLowerCase()))) {
+        .startsWith(params.get(0).toLowerCase(Locale.ROOT)))) {
       suggestions.add("all");
     }
 

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandDump.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -165,7 +165,7 @@ public final class CommandDump extends PlaceholderCommand {
 
     final String[] jars = plugin.getLocalExpansionManager()
         .getExpansionsFolder()
-        .list((dir, name) -> name.toLowerCase().endsWith(".jar"));
+        .list((dir, name) -> name.toLowerCase(Locale.ROOT).endsWith(".jar"));
 
     for (final String jar : jars) {
       builder.append("  ")

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandExpansionRegister.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandExpansionUnregister.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandHelp.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -45,9 +45,9 @@ public final class CommandHelp extends PlaceholderCommand {
     Msg.msg(sender,
         "&b&lPlaceholderAPI &8- &7Help Menu &8- &7(&f" + description.getVersion() + "&7)",
         " ",
-        "&b/papi &fbcparse &9<me/player name> <message>",
+        "&b/papi &fbcparse &9<me|--null|player name> <message>",
         "  &7&oParse a message with placeholders and broadcast it",
-        "&b/papi &fcmdparse &9<me/player> <command with placeholders>",
+        "&b/papi &fcmdparse &9<me|player> <command with placeholders>",
         "  &7&oParse a message with relational placeholders",
         "&b/papi &fdump",
         "  &7&oDump all relevant information needed to help debug issues into a paste link.",
@@ -55,7 +55,7 @@ public final class CommandHelp extends PlaceholderCommand {
         "  &7&oView information for a specific expansion",
         "&b/papi &flist",
         "  &7&oList active expansions",
-        "&b/papi &fparse &9<me/player name> <message>",
+        "&b/papi &fparse &9<me|--null|player name> <message>",
         "  &7&oParse a message with placeholders",
         "&b/papi &fparserel &9<player one> <player two> <message>",
         "  &7&oParse a message with relational placeholders",

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandInfo.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandList.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandParse.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -22,6 +22,7 @@ package me.clip.placeholderapi.commands.impl.local;
 
 import java.util.HashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Set;
 import java.util.stream.Stream;
 import me.clip.placeholderapi.PlaceholderAPI;
@@ -49,7 +50,7 @@ public final class CommandParse extends PlaceholderCommand {
   public void evaluate(@NotNull final PlaceholderAPIPlugin plugin,
       @NotNull final CommandSender sender, @NotNull final String alias,
       @NotNull @Unmodifiable final List<String> params) {
-    switch (alias.toLowerCase()) {
+    switch (alias.toLowerCase(Locale.ROOT)) {
       case "parserel":
         evaluateParseRelation(sender, params);
         break;
@@ -69,7 +70,7 @@ public final class CommandParse extends PlaceholderCommand {
   public void complete(@NotNull final PlaceholderAPIPlugin plugin,
       @NotNull final CommandSender sender, @NotNull final String alias,
       @NotNull @Unmodifiable final List<String> params, @NotNull final List<String> suggestions) {
-    switch (alias.toLowerCase()) {
+    switch (alias.toLowerCase(Locale.ROOT)) {
       case "parserel":
         completeParseRelation(params, suggestions);
         break;
@@ -92,7 +93,7 @@ public final class CommandParse extends PlaceholderCommand {
       return;
     }
 
-    @NotNull final OfflinePlayer player;
+    OfflinePlayer player;
 
     if ("me".equalsIgnoreCase(params.get(0))) {
       if (!(sender instanceof Player)) {
@@ -101,6 +102,8 @@ public final class CommandParse extends PlaceholderCommand {
       }
 
       player = ((Player) sender);
+    } else if ("--null".equalsIgnoreCase(params.get(0))) {
+      player = null;
     } else {
       final OfflinePlayer target = resolvePlayer(params.get(0));
       if (target == null) {
@@ -161,10 +164,14 @@ public final class CommandParse extends PlaceholderCommand {
       @NotNull @Unmodifiable final List<String> params, @NotNull final List<String> suggestions) {
     if (params.size() <= 1) {
       if (sender instanceof Player && (params.isEmpty() || "me"
-          .startsWith(params.get(0).toLowerCase()))) {
+          .startsWith(params.get(0).toLowerCase(Locale.ROOT)))) {
         suggestions.add("me");
       }
-
+      
+      if ("--null".startsWith(params.get(0).toLowerCase(Locale.ROOT))) {
+        suggestions.add("--null");
+      }
+      
       final Stream<String> names = Bukkit.getOnlinePlayers().stream().map(Player::getName);
       suggestByParameter(names, suggestions, params.isEmpty() ? null : params.get(0));
 

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandReload.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/commands/impl/local/CommandVersion.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/configuration/ExpansionSort.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/configuration/PlaceholderAPIConfig.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/events/ExpansionUnregisterEvent.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/events/ExpansionsLoadedEvent.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/events/PlaceholderHookUnloadEvent.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/exceptions/NoDefaultCommandException.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/Cacheable.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/Cleanable.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/Configurable.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/NMSVersion.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -26,7 +26,9 @@ import java.util.logging.Level;
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
 import me.clip.placeholderapi.PlaceholderHook;
 import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
 import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.entity.Player;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
@@ -398,6 +400,62 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
         getAuthor(), getVersion());
   }
 
+  /**
+   * This method is called first whenever PlaceholderAPI finds a valid placeholder with a matching expansion.
+   * <br>When called, the provided OfflinePlayer instance can be one of 3 possible states:
+   * 
+   * <ul>
+   *   <li>Not null and online</li>
+   *   <li>Not null and offline</li>
+   *   <li>Null</li>
+   * </ul>
+   * 
+   * When not overridden by the called expansion will the method as of now call
+   * {@link PlaceholderHook#onRequest(OfflinePlayer, String) PlaceholderHook#onRequest(OfflinePlayer, String)}.
+   * <br>This behaviour will change in a future version to call {@link #parsePlaceholders(Player, String) parsePlaceholders(Player, String)}
+   * with the OfflinePlayer either being casted to a Player (When online), or {@link null}.
+   * 
+   * <p>To use this method in your PlaceholderExpansion, override it and return either a String or {@code null}.
+   * <br>When {@code null} is returned will PlaceholderAPI see it as an "invalid placeholder" and return
+   * the content as-is in the final String.
+   * 
+   * @param player The OfflinePlayer to use.
+   * @param params The parameters of the placeholder, right after the first underscore.
+   * @return Parsed placeholder, or null depending on the Expansion's handling of it.
+   */
+  @Nullable
+  public String parsePlaceholders(@Nullable OfflinePlayer player, @NotNull String params) {
+    return this.onRequest(player, params);
+  }
+
+  /**
+   * This method is called whenever PlaceholderAPI finds a valid placeholder with a matching expansion
+   * AND {@link #parsePlaceholders(OfflinePlayer, String) parsePlaceholder(OfflinePlayer, String)} isn't
+   * overridden by the expansion in question.
+   * <br>When called, the provided Player instance can be one of 2 possible states:
+   * 
+   * <ul>
+   *   <li>Not null and online</li>
+   *   <li>Null</li>
+   * </ul>
+   *
+   * When not overridden by the called expansion will the method as of now call
+   * {@link PlaceholderHook#onPlaceholderRequest(Player, String) PlaceholderHook#onPlaceholderRequest(Player, String)}.
+   * <br>This behaviour will change in a future version to instead return {@code null}.
+   * 
+   * <p>To use this method in your PlaceholderExpansion, override it and return either a String or {@code null}.
+   * <br>When {@code null} is returned will PlaceholderAPI see it as an "invalid placeholder" and return
+   * the content as-is in the final String.
+   * 
+   * @param player The Player to use. May be null
+   * @param params The parameters of the placeholder, right after the first underscore.
+   * @return Parsed placeholder, or null depending on the Expansion's handling of it.
+   */
+  @Nullable
+  public String parsePlaceholders(@Nullable Player player, @NotNull String params){
+    return this.onPlaceholderRequest(player, params);
+  }
+  
   // === Deprecated API ===
 
   /**
@@ -406,7 +464,7 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    * @return The plugin name.
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public String getPlugin() {
     return null;
   }
@@ -417,7 +475,7 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    * @return The description of the expansion.
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public String getDescription() {
     return null;
   }
@@ -428,7 +486,7 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    * @return The link for the expansion.
    */
   @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
+  @ApiStatus.ScheduledForRemoval(inVersion = "2.13.0")
   public String getLink() {
     return null;
   }

src/main/java/me/clip/placeholderapi/expansion/Relational.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -21,23 +21,29 @@
 package me.clip.placeholderapi.expansion;
 
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
- * Implementing this interface allows your {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion}
- * to be used as a relational placeholder expansion.
+ * This interface should be used when your {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion}
+ * should support relational placeholders.
  * 
- * <p>Relational placeholders take two Players as input and are always prefixed with {@code rel_},
- * so {@code %foo_bar%} becomes {@code %rel_foo_bar%}
+ * <p>The difference between relational placeholders and normal ones is, that relational ones start
+ * with a {@code rel_} prefix and have two Players provided, instead of one.
+ * <br>The main purpose is to return a String based on the "relationship" between the two players
+ * (i.e. if both are within the same world).
  */
 public interface Relational {
 
   /**
-   * This method is called whenever a placeholder starting with {@code rel_} is called.
+   * This method will be called whenever a valid placeholder in the format {@code %rel_<expansion>_<identifier>%}
+   * is found.
    * 
-   * @param one The first player used for the placeholder.
-   * @param two The second player used for the placeholder.
-   * @param identifier The text right after the expansion's name (%expansion_<b>identifier</b>%)
-   * @return Parsed String from the expansion.
+   * @param one The first player to use for comparison.
+   * @param two The second player to use for comparison
+   * @param identifier String right after {@code %rel_<expansion>_} and before the second percent symbol.
+   * @return Possibly-null String, depending on what the expansion returns.
    */
-  String onPlaceholderRequest(Player one, Player two, String identifier);
+  @Nullable
+  String onPlaceholderRequest(Player one, Player two, @NotNull String identifier);
 }

src/main/java/me/clip/placeholderapi/expansion/Taskable.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/Version.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/VersionSpecific.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/cloud/CloudExpansion.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/expansion/manager/CloudExpansionManager.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -37,6 +37,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
@@ -88,7 +89,7 @@ public final class CloudExpansionManager {
 
   @NotNull
   private static String toIndexName(@NotNull final String name) {
-    return name.toLowerCase().replace(' ', '_');
+    return name.toLowerCase(Locale.ROOT).replace(' ', '_');
   }
 
   @NotNull

src/main/java/me/clip/placeholderapi/expansion/manager/LocalExpansionManager.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -125,7 +125,7 @@ public final class LocalExpansionManager implements Listener {
   public PlaceholderExpansion getExpansion(@NotNull final String identifier) {
     expansionsLock.lock();
     try {
-      return expansions.get(identifier.toLowerCase());
+      return expansions.get(identifier.toLowerCase(Locale.ROOT));
     } finally {
       expansionsLock.unlock();
     }
@@ -193,7 +193,7 @@ public final class LocalExpansionManager implements Listener {
 
   @ApiStatus.Internal
   public boolean register(@NotNull final PlaceholderExpansion expansion) {
-    final String identifier = expansion.getIdentifier().toLowerCase();
+    final String identifier = expansion.getIdentifier().toLowerCase(Locale.ROOT);
 
     if (!expansion.canRegister()) {
       return false;

src/main/java/me/clip/placeholderapi/expansion/manager/MethodSignature.java

@@ -1,3 +1,23 @@
+/*
+ * This file is part of PlaceholderAPI
+ *
+ * PlaceholderAPI
+ * Copyright (c) 2015 - 2021 PlaceholderAPI Team
+ *
+ * PlaceholderAPI free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlaceholderAPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package me.clip.placeholderapi.expansion.manager;
 
 import java.util.Arrays;

src/main/java/me/clip/placeholderapi/listeners/ServerLoadEventListener.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/replacer/CharsReplacer.java

@@ -1,178 +1,137 @@
-/*
- * This file is part of PlaceholderAPI
- *
- * PlaceholderAPI
- * Copyright (c) 2015 - 2021 PlaceholderAPI Team
- *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * PlaceholderAPI is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package me.clip.placeholderapi.replacer;
-
-import java.util.function.Function;
-import me.clip.placeholderapi.expansion.PlaceholderExpansion;
-import org.bukkit.ChatColor;
-import org.bukkit.OfflinePlayer;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-public final class CharsReplacer implements Replacer {
-
-  @NotNull
-  private final Closure closure;
-
-  public CharsReplacer(@NotNull final Closure closure) {
-    this.closure = closure;
-  }
-
-
-  @NotNull
-  @Override
-  public String apply(@NotNull final String text, @Nullable final OfflinePlayer player,
-      @NotNull final Function<String, @Nullable PlaceholderExpansion> lookup) {
-    final char[] chars = text.toCharArray();
-    final StringBuilder builder = new StringBuilder(text.length());
-
-    final StringBuilder identifier = new StringBuilder();
-    final StringBuilder parameters = new StringBuilder();
-
-    for (int i = 0; i < chars.length; i++) {
-      final char l = chars[i];
-      
-      if (l == '&' && ++i < chars.length) {
-        final char c = Character.toLowerCase(chars[i]);
-
-        if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' && c != '5' && c != '6'
-            && c != '7' && c != '8' && c != '9' && c != 'a' && c != 'b' && c != 'c' && c != 'd'
-            && c != 'e' && c != 'f' && c != 'k' && c != 'l' && c != 'm' && c != 'n' && c != 'o' && c != 'r'
-            && c != 'x') {
-          builder.append(l).append(chars[i]);
-        } else {
-          builder.append(ChatColor.COLOR_CHAR);
-
-          if (c != 'x') {
-            builder.append(chars[i]);
-            continue;
-          }
-
-          if ((i > 1 && chars[i - 2] == '\\') /*allow escaping &x*/) {
-            builder.setLength(builder.length() - 2);
-            builder.append('&').append(chars[i]);
-            continue;
-          }
-
-          builder.append(c);
-
-          int j = 0;
-          while (++j <= 6) {
-            if (i + j >= chars.length) {
-              break;
-            }
-
-            final char x = chars[i + j];
-            builder.append(ChatColor.COLOR_CHAR).append(x);
-          }
-
-          if (j == 7) {
-            i += 6;
-          } else {
-            builder.setLength(builder.length() - (j * 2)); // undo &x parsing
-          }
-        }
-        continue;
-      }
-
-      if (l != closure.head || i + 1 >= chars.length) {
-        builder.append(l);
-        continue;
-      }
-
-      boolean identified = false;
-      boolean oopsitsbad = true;
-      boolean hadSpace = false;
-
-      while (++i < chars.length) {
-        final char p = chars[i];
-
-        if (p == ' ' && !identified) {
-          hadSpace = true;
-          break;
-        }
-        if (p == closure.tail) {
-          oopsitsbad = false;
-          break;
-        }
-
-        if (p == '_' && !identified) {
-          identified = true;
-          continue;
-        }
-
-        if (identified) {
-          parameters.append(p);
-        } else {
-          identifier.append(p);
-        }
-      }
-
-      final String identifierString = identifier.toString().toLowerCase();
-      final String parametersString = parameters.toString();
-
-      identifier.setLength(0);
-      parameters.setLength(0);
-
-      if (oopsitsbad) {
-        builder.append(closure.head).append(identifier);
-
-        if (identified) {
-          builder.append('_').append(parametersString);
-        }
-
-        if (hadSpace) {
-          builder.append(' ');
-        }
-        continue;
-      }
-
-      final PlaceholderExpansion placeholder = lookup.apply(identifierString);
-      if (placeholder == null) {
-        builder.append(closure.head).append(identifierString);
-
-        if (identified) {
-          builder.append('_');
-        }
-
-        builder.append(parametersString).append(closure.tail);
-        continue;
-      }
-
-      final String replacement = placeholder.onRequest(player, parametersString);
-      if (replacement == null) {
-        builder.append(closure.head).append(identifierString);
-
-        if (identified) {
-          builder.append('_');
-        }
-
-        builder.append(parametersString).append(closure.tail);
-        continue;
-      }
-
-      builder.append(ChatColor.translateAlternateColorCodes('&', replacement));
-    }
-
-    return builder.toString();
-  }
-
-}
+/*
+ * This file is part of PlaceholderAPI
+ *
+ * PlaceholderAPI
+ * Copyright (c) 2015 - 2021 PlaceholderAPI Team
+ *
+ * PlaceholderAPI free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlaceholderAPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.clip.placeholderapi.replacer;
+
+import java.util.Locale;
+import java.util.function.Function;
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import org.bukkit.ChatColor;
+import org.bukkit.OfflinePlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public final class CharsReplacer implements Replacer {
+
+  @NotNull
+  private final Closure closure;
+
+  public CharsReplacer(@NotNull final Closure closure) {
+    this.closure = closure;
+  }
+
+
+  @NotNull
+  @Override
+  public String apply(@NotNull final String text, @Nullable final OfflinePlayer player,
+      @NotNull final Function<String, @Nullable PlaceholderExpansion> lookup) {
+    final char[] chars = text.toCharArray();
+    final StringBuilder builder = new StringBuilder(text.length());
+
+    final StringBuilder identifier = new StringBuilder();
+    final StringBuilder parameters = new StringBuilder();
+
+    for (int i = 0; i < chars.length; i++) {
+      final char l = chars[i];
+
+      if (l != closure.head || i + 1 >= chars.length) {
+        builder.append(l);
+        continue;
+      }
+
+      boolean identified = false;
+      boolean invalid = true;
+      boolean hadSpace = false;
+
+      while (++i < chars.length) {
+        final char p = chars[i];
+
+        if (p == ' ' && !identified) {
+          hadSpace = true;
+          break;
+        }
+        if (p == closure.tail) {
+          invalid = false;
+          break;
+        }
+
+        if (p == '_' && !identified) {
+          identified = true;
+          continue;
+        }
+
+        if (identified) {
+          parameters.append(p);
+        } else {
+          identifier.append(p);
+        }
+      }
+
+      final String identifierString = identifier.toString();
+      final String lowercaseIdentifierString = identifierString.toLowerCase(Locale.ROOT);
+      final String parametersString = parameters.toString();
+
+      identifier.setLength(0);
+      parameters.setLength(0);
+
+      if (invalid) {
+        builder.append(closure.head).append(identifierString);
+
+        if (identified) {
+          builder.append('_').append(parametersString);
+        }
+
+        if (hadSpace) {
+          builder.append(' ');
+        }
+        continue;
+      }
+
+      final PlaceholderExpansion placeholder = lookup.apply(lowercaseIdentifierString);
+      if (placeholder == null) {
+        builder.append(closure.head).append(identifierString);
+
+        if (identified) {
+          builder.append('_');
+        }
+
+        builder.append(parametersString).append(closure.tail);
+        continue;
+      }
+
+      final String replacement = placeholder.parsePlaceholders(player, parametersString);
+      if (replacement == null) {
+        builder.append(closure.head).append(identifierString);
+
+        if (identified) {
+          builder.append('_');
+        }
+
+        builder.append(parametersString).append(closure.tail);
+        continue;
+      }
+
+      builder.append(ChatColor.translateAlternateColorCodes('&', replacement));
+    }
+
+    return builder.toString();
+  }
+
+}

src/main/java/me/clip/placeholderapi/replacer/RegexReplacer.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
@@ -61,7 +61,7 @@ public final class RegexReplacer implements Replacer {
         continue;
       }
 
-      final String requested = expansion.onRequest(player, parameters);
+      final String requested = expansion.parsePlaceholders(player, parameters);
       matcher.appendReplacement(builder, requested != null ? requested : matcher.group(0));
     }
     while (matcher.find());

src/main/java/me/clip/placeholderapi/replacer/Replacer.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/updatechecker/UpdateChecker.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/FileUtil.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/Format.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/Futures.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/Msg.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/TimeFormat.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/main/java/me/clip/placeholderapi/util/TimeUtil.java

@@ -4,7 +4,7 @@
  * PlaceholderAPI
  * Copyright (c) 2015 - 2021 PlaceholderAPI Team
  *
- * PlaceholderAPI is free software: you can redistribute it and/or modify
+ * PlaceholderAPI free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

src/test/java/me/clip/placeholderapi/replacer/ReplacerUnitTester.java

@@ -88,12 +88,4 @@ public final class ReplacerUnitTester {
     assertEquals(text, Values.CHARS_REPLACER.apply(text, null, Values.PLACEHOLDERS::get));
   }
 
-  @Test
-  void testCharsReplacerHandlesEscapedHex() {
-    final String text = "\\&xffffffThis should not change.";
-
-    assertEquals(text.substring(1),
-        Values.CHARS_REPLACER.apply(text, null, Values.PLACEHOLDERS::get));
-  }
-
 }