Added "fast mode corrections"

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java

@@ -448,6 +448,17 @@ public class BukkitWorld extends AbstractWorld {
         }
     }
 
+    @Override
+    public boolean notifyAndLightBlock(BlockVector3 position, com.sk89q.worldedit.world.block.BlockState previousType) throws WorldEditException {
+        BukkitImplAdapter adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
+        if (adapter != null) {
+            adapter.notifyAndLightBlock(BukkitAdapter.adapt(getWorld(), position), previousType);
+            return true;
+        }
+
+        return false;
+    }
+
     @Override
     public BaseBiome getBiome(BlockVector2 position) {
         BukkitImplAdapter adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java

@@ -24,6 +24,7 @@ import com.sk89q.worldedit.world.block.BaseBlock;
 import com.sk89q.worldedit.entity.BaseEntity;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.registry.state.Property;
+import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import org.bukkit.Location;
@@ -78,6 +79,15 @@ public interface BukkitImplAdapter {
      */
     boolean setBlock(Location location, BlockStateHolder state, boolean notifyAndLight);
 
+    /**
+     * Notifies the simulation that the block at the given location has
+     * been changed and it must be re-lighted (and issue other events).
+     *
+     * @param position position of the block
+     * @param previousType the type of the previous block that was there
+     */
+    void notifyAndLightBlock(Location position, BlockState previousType);
+
     /**
      * Get the state for the given entity.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -170,6 +170,8 @@ public class EditSession implements Extent, AutoCloseable {
     private final Extent bypassHistory;
     private final Extent bypassNone;
 
+    private final boolean useFastModeCorrections;
+
     private Mask oldMask;
 
     /**
@@ -187,12 +189,13 @@ public class EditSession implements Extent, AutoCloseable {
         checkNotNull(event);
 
         this.world = world;
+        this.useFastModeCorrections = false;
 
         if (world != null) {
             Extent extent;
 
             // These extents are ALWAYS used
-            extent = fastModeExtent = new FastModeExtent(world, false);
+            extent = fastModeExtent = new FastModeExtent(world, useFastModeCorrections);
             extent = survivalExtent = new SurvivalModeExtent(extent, world);
             extent = quirkExtent = new BlockQuirkExtent(extent, world);
             extent = chunkLoadingExtent = new ChunkLoadingExtent(extent, world);
@@ -299,14 +302,16 @@ public class EditSession implements Extent, AutoCloseable {
      * @return whether the queue is enabled
      */
     public boolean isQueueEnabled() {
-        return reorderExtent.isEnabled();
+        return !useFastModeCorrections && reorderExtent.isEnabled();
     }
 
     /**
      * Queue certain types of block for better reproduction of those blocks.
      */
     public void enableQueue() {
-        reorderExtent.setEnabled(true);
+        if (!useFastModeCorrections) {
+            reorderExtent.setEnabled(true);
+        }
     }
 
     /**
@@ -361,7 +366,14 @@ public class EditSession implements Extent, AutoCloseable {
      */
     public void setFastMode(boolean enabled) {
         if (fastModeExtent != null) {
-            fastModeExtent.setEnabled(enabled);
+            // If fast mode corrections are enabled, we're using fast mode for
+            // multipass support. Thus, we do not actually ever turn the fast mode
+            // extent off, we instead toggle post edit simulation
+            if (useFastModeCorrections) {
+                fastModeExtent.setPostEditSimulationEnabled(!enabled);
+            } else {
+                fastModeExtent.setEnabled(enabled);
+            }
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/extent/world/FastModeExtent.java

@@ -29,9 +29,12 @@ import com.sk89q.worldedit.math.BlockVector2;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.world.World;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
+import com.sk89q.worldedit.world.block.BlockTypes;
 
+import java.util.ArrayDeque;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Queue;
 import java.util.Set;
 
 /**
@@ -40,8 +43,10 @@ import java.util.Set;
 public class FastModeExtent extends AbstractDelegateExtent {
 
     private final World world;
+    private final Queue<BlockVector3> positions = new ArrayDeque<>();
     private final Set<BlockVector2> dirtyChunks = new HashSet<>();
     private boolean enabled = true;
+    private boolean postEditSimulation;
 
     /**
      * Create a new instance with fast mode enabled.
@@ -63,6 +68,9 @@ public class FastModeExtent extends AbstractDelegateExtent {
         checkNotNull(world);
         this.world = world;
         this.enabled = enabled;
+        if (enabled) {
+            this.postEditSimulation = true;
+        }
     }
 
     /**
@@ -83,11 +91,27 @@ public class FastModeExtent extends AbstractDelegateExtent {
         this.enabled = enabled;
     }
 
+    public boolean isPostEditSimulationEnabled() {
+        return postEditSimulation;
+    }
+
+    public void setPostEditSimulationEnabled(boolean enabled) {
+        this.postEditSimulation = enabled;
+    }
+
     @Override
     public boolean setBlock(BlockVector3 location, BlockStateHolder block) throws WorldEditException {
         if (enabled) {
             dirtyChunks.add(BlockVector2.at(location.getBlockX() >> 4, location.getBlockZ() >> 4));
-            return world.setBlock(location, block, false);
+
+            if (world.setBlock(location, block, false)) {
+                if (postEditSimulation) {
+                    positions.offer(location);
+                }
+                return true;
+            }
+
+            return false;
         } else {
             return world.setBlock(location, block, true);
         }
@@ -101,6 +125,16 @@ public class FastModeExtent extends AbstractDelegateExtent {
                 if (!dirtyChunks.isEmpty()) {
                     world.fixAfterFastMode(dirtyChunks);
                 }
+
+                if (postEditSimulation) {
+                    while (run.shouldContinue() && !positions.isEmpty()) {
+                        BlockVector3 position = positions.poll(); // Remove from queue
+                        world.notifyAndLightBlock(position, BlockTypes.AIR.getDefaultState());
+                    }
+
+                    return !positions.isEmpty() ? this : null;
+                }
+
                 return null;
             }
 

worldedit-core/src/main/java/com/sk89q/worldedit/history/changeset/ChangeSet.java

@@ -42,6 +42,7 @@ public interface ChangeSet {
      * @return whether or not the ChangeSet is set to record changes
      */
     boolean isRecordingChanges();
+
     /**
      * Tell the change set whether to record changes or not.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/world/NullWorld.java

@@ -64,6 +64,11 @@ public class NullWorld extends AbstractWorld {
         return false;
     }
 
+    @Override
+    public boolean notifyAndLightBlock(BlockVector3 position, BlockState previousType) throws WorldEditException {
+        return false;
+    }
+
     @Override
     public int getBlockLightLevel(BlockVector3 position) {
         return 0;

worldedit-core/src/main/java/com/sk89q/worldedit/world/World.java

@@ -33,10 +33,13 @@ import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.Direction;
 import com.sk89q.worldedit.util.TreeGenerator;
+import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.weather.WeatherType;
 
+import java.util.Vector;
+
 /**
  * Represents a world (dimension).
  */
@@ -95,6 +98,16 @@ public interface World extends Extent {
      */
     boolean setBlock(BlockVector3 position, BlockStateHolder block, boolean notifyAndLight) throws WorldEditException;
 
+    /**
+     * Notifies the simulation that the block at the given location has
+     * been changed and it must be re-lighted (and issue other events).
+     *
+     * @param position position of the block
+     * @param previousType the type of the previous block that was there
+     * @return true if the block was successfully notified
+     */
+    boolean notifyAndLightBlock(BlockVector3 position, BlockState previousType) throws WorldEditException;
+
     /**
      * Get the light level at the given block.
      *

worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgeWorld.java

@@ -212,6 +212,12 @@ public class ForgeWorld extends AbstractWorld {
         return successful;
     }
 
+    @Override
+    public boolean notifyAndLightBlock(BlockVector3 position, BlockState previousType) throws WorldEditException {
+        // TODO Implement
+        return false;
+    }
+
     // Can't get the "Object" to be right for withProperty w/o this
     @SuppressWarnings({ "rawtypes", "unchecked" })
     private IBlockState applyProperties(BlockStateContainer stateContainer, IBlockState newState, Map<Property<?>, Object> states) {

worldedit-sponge/src/main/java/com/sk89q/worldedit/sponge/SpongeWorld.java

@@ -41,7 +41,6 @@ import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.item.ItemTypes;
 import com.sk89q.worldedit.world.weather.WeatherType;
 import com.sk89q.worldedit.world.weather.WeatherTypes;
-
 import org.spongepowered.api.Sponge;
 import org.spongepowered.api.block.BlockSnapshot;
 import org.spongepowered.api.block.BlockState;
@@ -163,6 +162,12 @@ public abstract class SpongeWorld extends AbstractWorld {
         return true;
     }
 
+    @Override
+    public boolean notifyAndLightBlock(BlockVector3 position, com.sk89q.worldedit.world.block.BlockState previousType) throws WorldEditException {
+        // TODO Move this to adapter
+        return false;
+    }
+
     @Override
     public boolean regenerate(Region region, EditSession editSession) {
         return false;