Add lowest solid block

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

@@ -0,0 +1,90 @@
+/**
+ *   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.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.expressions.base.SimplePropertyExpression;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.util.Kleenean;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.eclipse.jdt.annotation.Nullable;
+
+@Name("Lowest/Highest Solid Block")
+@Description("An expression to obtain the lowest or highest solid block at a location.")
+@Examples({
+	"teleport the player to the block above the highest block at the player",
+	"set the highest solid block at the player's location to the lowest non-air block at the player's location"
+})
+@Since("2.2-dev34, INSERT VERSION (lowest solid block)")
+public class ExprLowestHighestSolidBlock extends SimplePropertyExpression<Location, Block> {
+
+	static {
+		Skript.registerExpression(ExprLowestHighestSolidBlock.class, Block.class, ExpressionType.COMBINED,
+			"[the] (highest|:lowest) [solid|non-air] block (at|of) %locations%"
+		);
+	}
+
+	private boolean lowest;
+
+	@Override
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		lowest = parseResult.hasTag("lowest");
+		return super.init(exprs, matchedPattern, isDelayed, parseResult);
+	}
+
+	@Override
+	@Nullable
+	public Block convert(Location location) {
+		World world = location.getWorld();
+		if (world == null)
+			return null;
+
+		if (!lowest)
+			return world.getHighestBlockAt(location);
+
+		// sigh...
+		location = location.clone();
+		location.setY(world.getMinHeight());
+		Block block = location.getBlock();
+		int maxHeight = world.getMaxHeight();
+		while (block.getY() < maxHeight && !block.isSolid())
+			block = block.getRelative(BlockFace.UP);
+		return block.isSolid() ? block : world.getHighestBlockAt(block.getLocation());
+	}
+
+	@Override
+	public Class<? extends Block> getReturnType() {
+		return Block.class;
+	}
+
+	@Override
+	protected String getPropertyName() {
+		return (lowest ? "lowest" : "highest") + " solid block";
+	}
+
+}