[WIP] Add on screen kick message expr

src/main/java/ch/njol/skript/expressions/ExprOnScreenKickMessage.java

@@ -0,0 +1,79 @@
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.classes.Changer.ChangeMode;
+import ch.njol.skript.lang.EventRestrictedSyntax;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.skript.lang.util.SimpleExpression;
+import ch.njol.util.Kleenean;
+import ch.njol.util.coll.CollectionUtils;
+import org.bukkit.event.Event;
+import org.bukkit.event.player.PlayerKickEvent;
+import ch.njol.skript.Skript;
+import ch.njol.skript.doc.*;
+import org.jetbrains.annotations.Nullable;
+
+@Name("On-screen Kick Message")
+@Description("The kick message that is displayed on-screen when a player is kicked.")
+@Examples({
+	"on kick:",
+		"\ton-screen kick message is \"Invalid hotbar selection (Hacking?)\"",
+		"\tcancel event"
+})
+@Since("INSERT VERSION")
+@Events("Kick")
+public class ExprOnScreenKickMessage extends SimpleExpression<String> implements EventRestrictedSyntax {
+
+	static {
+		Skript.registerExpression(ExprOnScreenKickMessage.class, String.class, ExpressionType.SIMPLE, "[the] on-screen kick message");
+	}
+
+	@Override
+	public boolean init(Expression<?>[] expressions, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		return true;
+	}
+
+	@Override
+	protected String @Nullable [] get(Event event) {
+		if (event instanceof PlayerKickEvent playerKickEvent) {
+			return new String[] { playerKickEvent.getReason() };
+		}
+		return null;
+	}
+
+	@Override
+	public Class<?> @Nullable [] acceptChange(ChangeMode mode) {
+		return mode == ChangeMode.SET ? CollectionUtils.array(String.class) : null;
+	}
+
+	@Override
+	public void change(Event event, Object @Nullable [] delta, ChangeMode mode) {
+		assert delta != null;
+		assert delta.length == 1;
+		if (event instanceof PlayerKickEvent kickEvent && delta[0] instanceof String text) {
+			kickEvent.setReason(text);
+		}
+	}
+
+	@Override
+	public boolean isSingle() {
+		return true;
+	}
+
+	@Override
+	public Class<? extends String> getReturnType() {
+		return String.class;
+	}
+
+	@Override
+	public String toString(@Nullable Event event, boolean debug) {
+		return "the on-screen kick message";
+	}
+
+	@Override
+	public Class<? extends Event>[] supportedEvents() {
+		return CollectionUtils.array(PlayerKickEvent.class);
+	}
+
+}