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

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+/**
+ *   This file is part of Skript.
+ *
+ *  Skript 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.
+ *
+ *  Skript 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 Skript.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright Peter Güttinger, SkriptLang team and contributors
+ */
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.classes.Changer.ChangeMode;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser;
+import ch.njol.skript.lang.util.SimpleExpression;
+import ch.njol.util.Kleenean;
+import ch.njol.util.coll.CollectionUtils;
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+import org.bukkit.Bukkit;
+import org.bukkit.event.Event;
+import org.bukkit.event.server.ServerListPingEvent;
+import org.eclipse.jdt.annotation.Nullable;
+
+@Name("Get Player/Entity")
+@Description({"The count of max players. This can be changed in a <a href='events.html#server_list_ping'>server list ping</a> event only.",
+		"'real max players' returns the real count of max players of the server always and can't be changed."})
+@Examples({"set {_p} to player \"Notch\"",
+		"set {_p} to player from uuid\"Notch\""})
+@Since("INSERT VERSION")
+public class ExprGetPlayer extends SimpleExpression<Number> {
+
+	static {
+		Skript.registerExpression(ExprGetPlayer.class, Number.class, ExpressionType.PROPERTY,
+				"[(1¦offline)]player ((with|from) [the] (uuid|name)|named) %string%",
+				"entity (with|from) [the] uuid %string%");
+	}
+
+	private static final boolean PAPER_EVENT_EXISTS = Skript.classExists("com.destroystokyo.paper.event.server.PaperServerListPingEvent");
+
+	private boolean isReal;
+
+	@Override
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
+		boolean isServerPingEvent = getParser().isCurrentEvent(ServerListPingEvent.class) ||
+				(PAPER_EVENT_EXISTS && getParser().isCurrentEvent(PaperServerListPingEvent.class));
+		if (parseResult.mark == 2 && !isServerPingEvent) {
+			Skript.error("The 'shown' max players count expression can't be used outside of a server list ping event");
+			return false;
+		}
+		isReal = (parseResult.mark == 0 && !isServerPingEvent) || parseResult.mark == 1;
+		return true;
+	}
+
+	@Override
+	@Nullable
+	public Number[] get(Event e) {
+		if (isReal)
+			return CollectionUtils.array(Bukkit.getMaxPlayers());
+		else
+			return CollectionUtils.array(((ServerListPingEvent) e).getMaxPlayers());
+	}
+
+	@Override
+	@Nullable
+	public Class<?>[] acceptChange(ChangeMode mode) {
+		if (!isReal) {
+			if (getParser().getHasDelayBefore().isTrue()) {
+				Skript.error("Can't change the fake max players count anymore after the server list ping event has already passed");
+				return null;
+			}
+			switch (mode) {
+				case SET:
+				case ADD:
+				case REMOVE:
+				case DELETE:
+				case RESET:
+					return CollectionUtils.array(Number.class);
+			}
+		}
+		return null;
+	}
+
+	@SuppressWarnings("null")
+	@Override
+	public void change(Event e, @Nullable Object[] delta, ChangeMode mode) {
+		ServerListPingEvent event = (ServerListPingEvent) e;
+		switch (mode) {
+			case SET:
+				event.setMaxPlayers(((Number) delta[0]).intValue());
+				break;
+			case ADD:
+				event.setMaxPlayers(event.getMaxPlayers() + ((Number) delta[0]).intValue());
+				break;
+			case REMOVE:
+				event.setMaxPlayers(event.getMaxPlayers() - ((Number) delta[0]).intValue());
+				break;
+			case DELETE:
+			case RESET:
+				event.setMaxPlayers(Bukkit.getMaxPlayers());
+		}
+	}
+
+	@Override
+	public boolean isSingle() {
+		return true;
+	}
+
+	@Override
+	public Class<? extends Number> getReturnType() {
+		return Number.class;
+	}
+
+	@Override
+	public String toString(@Nullable Event e, boolean debug) {
+		return "the count of " + (isReal ? "real max players" : "max players");
+	}
+
+}