Use DFUs for some additional data fixing.

Legacy mapper now uses the data fixers to upgrade blocks and item types
(e.g. signs, dyes that changed names in 1.14).
The sponge schematic reader can now attempt to use the data fixers to
upgrade blocks, block entities, biomes and entities. This has been
tested with the 1.13 -> 1.14 changes. It is yet to be seen if it will
continue to work because...
The mc edit schematic reader has code for using data fixers, but it is
currently disabled as there seem to be some issues with fixing up older
block entities.

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

@@ -58,6 +58,10 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.world.WorldInitEvent;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -102,11 +106,6 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
         // Setup platform
         server = new BukkitServerInterface(this, getServer());
         worldEdit.getPlatformManager().register(server);
-        loadAdapter(); // Need an adapter to work with special blocks with NBT data
-        setupRegistries();
-        worldEdit.loadMappings();
-
-        loadConfig(); // Load configuration
     }
 
     /**
@@ -114,8 +113,6 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
      */
     @Override
     public void onEnable() {
-        setupTags(); // these have to be done post-world since they rely on MC registries. the other ones just use Bukkit enums
-
         PermissionsResolverManager.initialize(this); // Setup permission resolver
 
         // Register CUI
@@ -125,10 +122,8 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
         // Now we can register events
         getServer().getPluginManager().registerEvents(new WorldEditListener(this), this);
 
-        // If we are on MCPC+/Cauldron, then Forge will have already loaded
+        // register this so we can load world-dependent data right as the first world is loading
-        // Forge WorldEdit and there's (probably) not going to be any other
+        getServer().getPluginManager().registerEvents(new WorldInitListener(), this);
-        // platforms to be worried about... at the current time of writing
-        WorldEdit.getInstance().getEventBus().post(new PlatformReadyEvent());
 
         // Enable metrics
         new Metrics(this);
@@ -433,4 +428,20 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
         return bukkitAdapter;
     }
 
+    private class WorldInitListener implements Listener {
+        private boolean loaded = false;
+        @EventHandler(priority = EventPriority.LOWEST)
+        public void onWorldInit(@SuppressWarnings("unused") WorldInitEvent event) {
+            if (loaded) return;
+            loaded = true;
+
+            loadAdapter(); // Need an adapter to work with special blocks with NBT data
+            setupRegistries();
+            WorldEdit.getInstance().loadMappings();
+            loadConfig(); // Load configuration
+            setupTags();
+
+            WorldEdit.getInstance().getEventBus().post(new PlatformReadyEvent());
+        }
+    }
 }

worldedit-bukkit/src/main/resources/plugin.yml

@@ -1,6 +1,7 @@
 name: WorldEdit
 main: com.sk89q.worldedit.bukkit.WorldEditPlugin
 version: "${internalVersion}"
+load: STARTUP
 api-version: 1.13
 
 # Permissions aren't here. Read http://wiki.sk89q.com/wiki/WEPIF/DinnerPerms

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/MCEditSchematicReader.java

@@ -44,6 +44,7 @@ import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.Location;
+import com.sk89q.worldedit.world.DataFixer;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.entity.EntityType;
 import com.sk89q.worldedit.world.entity.EntityTypes;
@@ -67,22 +68,21 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class MCEditSchematicReader extends NBTSchematicReader {
 
+    private static final Logger log = LoggerFactory.getLogger(MCEditSchematicReader.class);
+    private final NBTInputStream inputStream;
+    private final DataFixer fixer;
     private static final ImmutableList<NBTCompatibilityHandler> COMPATIBILITY_HANDLERS
             = ImmutableList.of(
                 new SignCompatibilityHandler(),
                 new FlowerPotCompatibilityHandler(),
                 new NoteBlockCompatibilityHandler(),
                 new SkullBlockCompatibilityHandler()
-        // TODO - item tags for inventories...? DFUs :>
     );
     private static final ImmutableList<EntityNBTCompatibilityHandler> ENTITY_COMPATIBILITY_HANDLERS
             = ImmutableList.of(
                     new Pre13HangingCompatibilityHandler()
     );
 
-    private static final Logger log = LoggerFactory.getLogger(MCEditSchematicReader.class);
-    private final NBTInputStream inputStream;
-
     /**
      * Create a new instance.
      *
@@ -91,6 +91,9 @@ public class MCEditSchematicReader extends NBTSchematicReader {
     public MCEditSchematicReader(NBTInputStream inputStream) {
         checkNotNull(inputStream);
         this.inputStream = inputStream;
+        this.fixer = null;
+                //com.sk89q.worldedit.WorldEdit.getInstance().getPlatformManager().queryCapability(
+                        //com.sk89q.worldedit.extension.platform.Capability.WORLD_EDITING).getDataFixer();
     }
 
     @Override
@@ -176,39 +179,44 @@ public class MCEditSchematicReader extends NBTSchematicReader {
         // Need to pull out tile entities
         List<Tag> tileEntities = requireTag(schematic, "TileEntities", ListTag.class).getValue();
         Map<BlockVector3, Map<String, Tag>> tileEntitiesMap = new HashMap<>();
-        Map<BlockVector3, BlockState> blockOverrides = new HashMap<>();
+        Map<BlockVector3, BlockState> blockStates = new HashMap<>();
 
         for (Tag tag : tileEntities) {
             if (!(tag instanceof CompoundTag)) continue;
             CompoundTag t = (CompoundTag) tag;
-
+            Map<String, Tag> values = new HashMap<>(t.getValue());
+            String id = t.getString("id");
+            values.put("id", new StringTag(convertBlockEntityId(id)));
             int x = t.getInt("x");
             int y = t.getInt("y");
             int z = t.getInt("z");
-            String id = t.getString("id");
-
-            Map<String, Tag> values = new HashMap<>(t.getValue());
-            values.put("id", new StringTag(convertBlockEntityId(id)));
-
             int index = y * width * length + z * width + x;
-            BlockState block = LegacyMapper.getInstance().getBlockFromLegacy(blocks[index], blockData[index]);
+
+            BlockState block = getBlockState(blocks[index], blockData[index]);
             BlockState newBlock = block;
             if (newBlock != null) {
                 for (NBTCompatibilityHandler handler : COMPATIBILITY_HANDLERS) {
                     if (handler.isAffectedBlock(newBlock)) {
                         newBlock = handler.updateNBT(block, values);
-                        if (newBlock == null) {
+                        if (newBlock == null || values.isEmpty()) {
                             break;
                         }
                     }
                 }
             }
+            if (values.isEmpty()) {
+                t = null;
+            }
+
+            if (fixer != null && t != null) {
+                t = fixer.fixUp(DataFixer.FixTypes.BLOCK_ENTITY, t, -1);
+            }
 
             BlockVector3 vec = BlockVector3.at(x, y, z);
-            tileEntitiesMap.put(vec, values);
+            if (t != null) {
-            if (newBlock != block) {
+                tileEntitiesMap.put(vec, t.getValue());
-                blockOverrides.put(vec, newBlock);
             }
+            blockStates.put(vec, newBlock);
         }
 
         BlockArrayClipboard clipboard = new BlockArrayClipboard(region);
@@ -221,10 +229,7 @@ public class MCEditSchematicReader extends NBTSchematicReader {
                 for (int z = 0; z < length; ++z) {
                     int index = y * width * length + z * width + x;
                     BlockVector3 pt = BlockVector3.at(x, y, z);
-                    boolean useOverride = blockOverrides.containsKey(pt);
+                    BlockState state = blockStates.computeIfAbsent(pt, p -> getBlockState(blocks[index], blockData[index]));
-                    BlockState state = useOverride
-                            ? blockOverrides.get(pt)
-                            : LegacyMapper.getInstance().getBlockFromLegacy(blocks[index], blockData[index]);
 
                     try {
                         if (state != null) {
@@ -233,7 +238,7 @@ public class MCEditSchematicReader extends NBTSchematicReader {
                             } else {
                                 clipboard.setBlock(region.getMinimumPoint().add(pt), state);
                             }
-                        } else if (!useOverride) {
+                        } else {
                             short block = blocks[index];
                             byte data = blockData[index];
                             int combined = block << 8 | data;
@@ -258,9 +263,11 @@ public class MCEditSchematicReader extends NBTSchematicReader {
             for (Tag tag : entityTags) {
                 if (tag instanceof CompoundTag) {
                     CompoundTag compound = (CompoundTag) tag;
+                    if (fixer != null) {
+                        compound = fixer.fixUp(DataFixer.FixTypes.ENTITY, compound, -1);
+                    }
                     String id = convertEntityId(compound.getString("id"));
                     Location location = NBTConversions.toLocation(clipboard, compound.getListTag("Pos"), compound.getListTag("Rotation"));
-
                     if (!id.isEmpty()) {
                         EntityType entityType = EntityTypes.get(id.toLowerCase(Locale.ROOT));
                         if (entityType != null) {
@@ -344,25 +351,42 @@ public class MCEditSchematicReader extends NBTSchematicReader {
 
     private String convertBlockEntityId(String id) {
         switch (id) {
-            case "Cauldron": return "brewing_stand";
+            case "Cauldron":
-            case "Control": return "command_block";
+                return "brewing_stand";
-            case "DLDetector": return "daylight_detector";
+            case "Control":
-            case "Trap": return "dispenser";
+                return "command_block";
-            case "EnchantTable": return "enchanting_table";
+            case "DLDetector":
-            case "EndGateway": return "end_gateway";
+                return "daylight_detector";
-            case "AirPortal": return "end_portal";
+            case "Trap":
-            case "EnderChest": return "ender_chest";
+                return "dispenser";
-            case "FlowerPot": return "flower_pot";
+            case "EnchantTable":
-            case "RecordPlayer": return "jukebox";
+                return "enchanting_table";
-            case "MobSpawner": return "mob_spawner";
+            case "EndGateway":
+                return "end_gateway";
+            case "AirPortal":
+                return "end_portal";
+            case "EnderChest":
+                return "ender_chest";
+            case "FlowerPot":
+                return "flower_pot";
+            case "RecordPlayer":
+                return "jukebox";
+            case "MobSpawner":
+                return "mob_spawner";
             case "Music":
             case "noteblock":
                 return "note_block";
-            case "Structure": return "structure_block";
+            case "Structure":
-            default: return id;
+                return "structure_block";
+            default:
+                return id;
         }
     }
 
+    private BlockState getBlockState(int id, int data) {
+        return LegacyMapper.getInstance().getBlockFromLegacy(id, data);
+    }
+
     @Override
     public void close() throws IOException {
         inputStream.close();

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/SpongeSchematicReader.java

@@ -36,14 +36,15 @@ import com.sk89q.worldedit.entity.BaseEntity;
 import com.sk89q.worldedit.extension.input.InputParseException;
 import com.sk89q.worldedit.extension.input.ParserContext;
 import com.sk89q.worldedit.extension.platform.Capability;
+import com.sk89q.worldedit.extension.platform.Platform;
 import com.sk89q.worldedit.extent.clipboard.BlockArrayClipboard;
 import com.sk89q.worldedit.extent.clipboard.Clipboard;
-import com.sk89q.worldedit.extent.clipboard.io.legacycompat.NBTCompatibilityHandler;
 import com.sk89q.worldedit.math.BlockVector2;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.Location;
+import com.sk89q.worldedit.world.DataFixer;
 import com.sk89q.worldedit.world.biome.BiomeType;
 import com.sk89q.worldedit.world.biome.BiomeTypes;
 import com.sk89q.worldedit.world.block.BlockState;
@@ -54,7 +55,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -68,14 +68,10 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class SpongeSchematicReader extends NBTSchematicReader {
 
-    private static final List<NBTCompatibilityHandler> COMPATIBILITY_HANDLERS = new ArrayList<>();
-
-    static {
-        // If NBT Compat handlers are needed - add them here.
-    }
-
     private static final Logger log = LoggerFactory.getLogger(SpongeSchematicReader.class);
     private final NBTInputStream inputStream;
+    private DataFixer fixer = null;
+    private int dataVersion = -1;
 
     /**
      * Create a new instance.
@@ -97,17 +93,32 @@ public class SpongeSchematicReader extends NBTSchematicReader {
 
         // Check
         Map<String, Tag> schematic = schematicTag.getValue();
+
         int version = requireTag(schematic, "Version", IntTag.class).getValue();
+        final Platform platform = WorldEdit.getInstance().getPlatformManager()
+                .queryCapability(Capability.WORLD_EDITING);
+        int liveDataVersion = platform.getDataVersion();
+
         if (version == 1) {
+            dataVersion = 1631; // this is a relatively safe assumption unless someone imports a schematic from 1.12, e.g. sponge 7.1-
+            fixer = platform.getDataFixer();
             return readVersion1(schematicTag);
         } else if (version == 2) {
-            int dataVersion = requireTag(schematic, "DataVersion", IntTag.class).getValue();
+            dataVersion = requireTag(schematic, "DataVersion", IntTag.class).getValue();
-            int liveDataVersion = WorldEdit.getInstance().getPlatformManager()
-                    .queryCapability(Capability.WORLD_EDITING).getDataVersion();
             if (dataVersion > liveDataVersion) {
                 log.warn("Schematic was made in a newer Minecraft version ({} > {}). Data may be incompatible.",
                         dataVersion, liveDataVersion);
+            } else if (dataVersion < liveDataVersion) {
+                fixer = platform.getDataFixer();
+                if (fixer != null) {
+                    log.info("Schematic was made in an older Minecraft version ({} < {}), will attempt DFU.",
+                            dataVersion, liveDataVersion);
+                } else {
+                    log.info("Schematic was made in an older Minecraft version ({} < {}), but DFU is not available. Data may be incompatible.",
+                            dataVersion, liveDataVersion);
                 }
+            }
+
             BlockArrayClipboard clip = readVersion1(schematicTag);
             return readVersion2(clip, schematicTag);
         }
@@ -159,6 +170,9 @@ public class SpongeSchematicReader extends NBTSchematicReader {
 
         for (String palettePart : paletteObject.keySet()) {
             int id = requireTag(paletteObject, palettePart, IntTag.class).getValue();
+            if (fixer != null) {
+                palettePart = fixer.fixUp(DataFixer.FixTypes.BLOCK_STATE, palettePart, dataVersion);
+            }
             BlockState state;
             try {
                 state = WorldEdit.getInstance().getBlockFactory().parseFromInput(palettePart, parserContext).toImmutableState();
@@ -184,7 +198,18 @@ public class SpongeSchematicReader extends NBTSchematicReader {
 
             for (Map<String, Tag> tileEntity : tileEntityTags) {
                 int[] pos = requireTag(tileEntity, "Pos", IntArrayTag.class).getValue();
-                tileEntitiesMap.put(BlockVector3.at(pos[0], pos[1], pos[2]), tileEntity);
+                final BlockVector3 pt = BlockVector3.at(pos[0], pos[1], pos[2]);
+                if (fixer != null) {
+                    Map<String, Tag> values = Maps.newHashMap(tileEntity);
+                    values.put("x", new IntTag(pt.getBlockX()));
+                    values.put("y", new IntTag(pt.getBlockY()));
+                    values.put("z", new IntTag(pt.getBlockZ()));
+                    values.put("id", values.get("Id"));
+                    values.remove("Id");
+                    values.remove("Pos");
+                    tileEntity = fixer.fixUp(DataFixer.FixTypes.BLOCK_ENTITY, new CompoundTag(values), dataVersion).getValue();
+                }
+                tileEntitiesMap.put(pt, tileEntity);
             }
         }
 
@@ -218,19 +243,7 @@ public class SpongeSchematicReader extends NBTSchematicReader {
             BlockVector3 pt = BlockVector3.at(x, y, z);
             try {
                 if (tileEntitiesMap.containsKey(pt)) {
-                    Map<String, Tag> values = Maps.newHashMap(tileEntitiesMap.get(pt));
+                    clipboard.setBlock(clipboard.getMinimumPoint().add(pt), state.toBaseBlock(new CompoundTag(tileEntitiesMap.get(pt))));
-                    for (NBTCompatibilityHandler handler : COMPATIBILITY_HANDLERS) {
-                        if (handler.isAffectedBlock(state)) {
-                            handler.updateNBT(state, values);
-                        }
-                    }
-                    values.put("x", new IntTag(pt.getBlockX()));
-                    values.put("y", new IntTag(pt.getBlockY()));
-                    values.put("z", new IntTag(pt.getBlockZ()));
-                    values.put("id", values.get("Id"));
-                    values.remove("Id");
-                    values.remove("Pos");
-                    clipboard.setBlock(clipboard.getMinimumPoint().add(pt), state.toBaseBlock(new CompoundTag(values)));
                 } else {
                     clipboard.setBlock(clipboard.getMinimumPoint().add(pt), state);
                 }
@@ -267,9 +280,13 @@ public class SpongeSchematicReader extends NBTSchematicReader {
         Map<String, Tag> paletteEntries = paletteTag.getValue();
 
         for (Entry<String, Tag> palettePart : paletteEntries.entrySet()) {
-            BiomeType biome = BiomeTypes.get(palettePart.getKey());
+            String key = palettePart.getKey();
+            if (fixer != null) {
+                key = fixer.fixUp(DataFixer.FixTypes.BIOME, key, dataVersion);
+            }
+            BiomeType biome = BiomeTypes.get(key);
             if (biome == null) {
-                log.warn("Unknown biome type :" + palettePart.getKey() +
+                log.warn("Unknown biome type :" + key +
                         " in palette. Are you missing a mod or using a schematic made in a newer version of Minecraft?");
             }
             Tag idTag = palettePart.getValue();
@@ -322,14 +339,18 @@ public class SpongeSchematicReader extends NBTSchematicReader {
             CompoundTag entityTag = (CompoundTag) et;
             Map<String, Tag> tags = entityTag.getValue();
             String id = requireTag(tags, "Id", StringTag.class).getValue();
+            entityTag = entityTag.createBuilder().putString("id", id).remove("Id").build();
+
+            if (fixer != null) {
+                entityTag = fixer.fixUp(DataFixer.FixTypes.ENTITY, entityTag, dataVersion);
+            }
 
             EntityType entityType = EntityTypes.get(id);
             if (entityType != null) {
                 Location location = NBTConversions.toLocation(clipboard,
                         requireTag(tags, "Pos", ListTag.class),
                         requireTag(tags, "Rotation", ListTag.class));
-                BaseEntity state = new BaseEntity(entityType,
+                BaseEntity state = new BaseEntity(entityType, entityTag);
-                        entityTag.createBuilder().putString("id", id).remove("Id").build());
                 clipboard.createEntity(location, state);
             } else {
                 log.warn("Unknown entity when pasting schematic: " + id);

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/FlowerPotCompatibilityHandler.java

@@ -48,6 +48,7 @@ public class FlowerPotCompatibilityHandler implements NBTCompatibilityHandler {
             }
             BlockState newState = convertLegacyBlockType(id, data);
             if (newState != null) {
+                values.clear();
                 return (B) newState; // generics pls :\
             }
         }

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/legacycompat/NoteBlockCompatibilityHandler.java

@@ -54,7 +54,8 @@ public class NoteBlockCompatibilityHandler implements NBTCompatibilityHandler {
         if (noteTag instanceof ByteTag) {
             Byte note = ((ByteTag) noteTag).getValue();
             if (note != null) {
-                return block.with(NoteProperty, (int) note);
+                values.clear();
+                return (B) block.with(NoteProperty, (int) note).toImmutableState();
             }
         }
         return block;

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

@@ -22,13 +22,32 @@ package com.sk89q.worldedit.world;
 import com.google.common.annotations.Beta;
 import com.sk89q.jnbt.CompoundTag;
 
+/**
+ * This entire class is subject to heavy changes. Do not use this as API.
+ */
 @Beta
 public interface DataFixer {
 
-    /**
+    final class FixType<T> {
-     * API SUBJECT TO CHANGE. DON'T USE THIS.
+        private FixType() {
-     */
+        }
-    @Beta
+    }
-    CompoundTag fixChunk(CompoundTag originalChunk);
+
-
+    final class FixTypes {
+        private FixTypes() {
+        }
+
+        public static FixType<CompoundTag> CHUNK = new FixType<>();
+        public static FixType<CompoundTag> BLOCK_ENTITY = new FixType<>();
+        public static FixType<CompoundTag> ENTITY = new FixType<>();
+        public static FixType<String> BLOCK_STATE = new FixType<>();
+        public static FixType<String> BIOME = new FixType<>();
+        public static FixType<String> ITEM_TYPE = new FixType<>();
+    }
+
+    default <T> T fixUp(FixType<T> type, T original) {
+        return fixUp(type, original, -1);
+    }
+
+    <T> T fixUp(FixType<T> type, T original, int srcVer);
 }

worldedit-core/src/main/java/com/sk89q/worldedit/world/chunk/AnvilChunk13.java

@@ -173,33 +173,10 @@ public class AnvilChunk13 implements Chunk {
 
             CompoundTag t = (CompoundTag) tag;
 
-            int x = 0;
+            Map<String, Tag> values = new HashMap<>(t.getValue());
-            int y = 0;
+            int x = ((IntTag) values.get("x")).getValue();
-            int z = 0;
+            int y = ((IntTag) values.get("y")).getValue();
-
+            int z = ((IntTag) values.get("z")).getValue();
-            Map<String, Tag> values = new HashMap<>();
-
-            for (Map.Entry<String, Tag> entry : t.getValue().entrySet()) {
-                switch (entry.getKey()) {
-                    case "x":
-                        if (entry.getValue() instanceof IntTag) {
-                            x = ((IntTag) entry.getValue()).getValue();
-                        }
-                        break;
-                    case "y":
-                        if (entry.getValue() instanceof IntTag) {
-                            y = ((IntTag) entry.getValue()).getValue();
-                        }
-                        break;
-                    case "z":
-                        if (entry.getValue() instanceof IntTag) {
-                            z = ((IntTag) entry.getValue()).getValue();
-                        }
-                        break;
-                }
-
-                values.put(entry.getKey(), entry.getValue());
-            }
 
             BlockVector3 vec = BlockVector3.at(x, y, z);
             tileEntities.put(vec, values);

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/LegacyMapper.java

@@ -26,10 +26,13 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 import com.sk89q.worldedit.WorldEdit;
+import com.sk89q.worldedit.extension.input.InputParseException;
 import com.sk89q.worldedit.extension.input.ParserContext;
+import com.sk89q.worldedit.extension.platform.Capability;
 import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.util.gson.VectorAdapter;
 import com.sk89q.worldedit.util.io.ResourceLoader;
+import com.sk89q.worldedit.world.DataFixer;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.item.ItemType;
 import com.sk89q.worldedit.world.item.ItemTypes;
@@ -41,18 +44,18 @@ import java.io.IOException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.Map;
 
-import static com.google.common.base.Preconditions.checkNotNull;
+public final class LegacyMapper {
-
-public class LegacyMapper {
 
     private static final Logger log = LoggerFactory.getLogger(LegacyMapper.class);
     private static LegacyMapper INSTANCE;
 
-    private Multimap<String, BlockState> stringToBlockMap = HashMultimap.create();
+    private Map<String, String> blockEntries = new HashMap<>();
+    private Map<String, BlockState> stringToBlockMap = new HashMap<>();
     private Multimap<BlockState, String> blockToStringMap = HashMultimap.create();
-    private Multimap<String, ItemType> stringToItemMap = HashMultimap.create();
+    private Map<String, ItemType> stringToItemMap = new HashMap<>();
     private Multimap<ItemType, String> itemToStringMap = HashMultimap.create();
 
     /**
@@ -82,31 +85,50 @@ public class LegacyMapper {
         String data = Resources.toString(url, Charset.defaultCharset());
         LegacyDataFile dataFile = gson.fromJson(data, new TypeToken<LegacyDataFile>() {}.getType());
 
+        DataFixer fixer = WorldEdit.getInstance().getPlatformManager().queryCapability(Capability.WORLD_EDITING).getDataFixer();
         ParserContext parserContext = new ParserContext();
         parserContext.setPreferringWildcard(false);
         parserContext.setRestricted(false);
         parserContext.setTryLegacy(false); // This is legacy. Don't match itself.
 
         for (Map.Entry<String, String> blockEntry : dataFile.blocks.entrySet()) {
-            try {
             String id = blockEntry.getKey();
+            blockEntries.put(id, blockEntry.getValue());
+            try {
                 BlockState state = WorldEdit.getInstance().getBlockFactory().parseFromInput(blockEntry.getValue(), parserContext).toImmutableState();
                 blockToStringMap.put(state, id);
                 stringToBlockMap.put(id, state);
-            } catch (Exception e) {
+            } catch (InputParseException e) {
+                boolean fixed = false;
+                if (fixer != null) {
+                    String newEntry = fixer.fixUp(DataFixer.FixTypes.BLOCK_STATE, blockEntry.getValue(), 1631);
+                    try {
+                        BlockState state = WorldEdit.getInstance().getBlockFactory().parseFromInput(newEntry, parserContext).toImmutableState();
+                        blockToStringMap.put(state, id);
+                        stringToBlockMap.put(id, state);
+                        fixed = true;
+                    } catch (InputParseException ignored) {
+                    }
+                }
+                if (!fixed) {
                     log.warn("Unknown block: " + blockEntry.getValue());
                 }
             }
+        }
 
         for (Map.Entry<String, String> itemEntry : dataFile.items.entrySet()) {
-            try {
             String id = itemEntry.getKey();
-                ItemType type = ItemTypes.get(itemEntry.getValue());
+            String value = itemEntry.getValue();
-                checkNotNull(type);
+            ItemType type = ItemTypes.get(value);
+            if (type == null && fixer != null) {
+                value = fixer.fixUp(DataFixer.FixTypes.ITEM_TYPE, value, 1631);
+                type = ItemTypes.get(value);
+            }
+            if (type == null) {
+                log.warn("Unknown item: " + value);
+            } else {
                 itemToStringMap.put(type, id);
                 stringToItemMap.put(id, type);
-            } catch (Exception e) {
-                log.warn("Unknown item: " + itemEntry.getValue());
             }
         }
     }
@@ -118,16 +140,16 @@ public class LegacyMapper {
 
     @Nullable
     public ItemType getItemFromLegacy(int legacyId, int data) {
-        return stringToItemMap.get(legacyId + ":" + data).stream().findFirst().orElse(null);
+        return stringToItemMap.get(legacyId + ":" + data);
     }
 
     @Nullable
     public int[] getLegacyFromItem(ItemType itemType) {
-        if (!itemToStringMap.containsKey(itemType)) {
+        if (itemToStringMap.containsKey(itemType)) {
-            return null;
-        } else {
             String value = itemToStringMap.get(itemType).stream().findFirst().get();
             return Arrays.stream(value.split(":")).mapToInt(Integer::parseInt).toArray();
+        } else {
+            return null;
         }
     }
 
@@ -138,16 +160,16 @@ public class LegacyMapper {
 
     @Nullable
     public BlockState getBlockFromLegacy(int legacyId, int data) {
-        return stringToBlockMap.get(legacyId + ":" + data).stream().findFirst().orElse(null);
+        return stringToBlockMap.get(legacyId + ":" + data);
     }
 
     @Nullable
     public int[] getLegacyFromBlock(BlockState blockState) {
-        if (!blockToStringMap.containsKey(blockState)) {
+        if (blockToStringMap.containsKey(blockState)) {
-            return null;
-        } else {
             String value = blockToStringMap.get(blockState).stream().findFirst().get();
             return Arrays.stream(value.split(":")).mapToInt(Integer::parseInt).toArray();
+        } else {
+            return null;
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/PassthroughBlockMaterial.java

@@ -160,7 +160,7 @@ public class PassthroughBlockMaterial implements BlockMaterial {
         if (blockMaterial == null) {
             return true;
         } else {
-            return blockMaterial.isOpaque();
+            return blockMaterial.isBurnable();
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/storage/ChunkStore.java

@@ -106,12 +106,13 @@ public abstract class ChunkStore implements Closeable {
         }
 
         int dataVersion = rootTag.getInt("DataVersion");
+        if (dataVersion == 0) dataVersion = -1;
         final Platform platform = WorldEdit.getInstance().getPlatformManager().queryCapability(Capability.WORLD_EDITING);
         final int currentDataVersion = platform.getDataVersion();
         if (dataVersion < currentDataVersion) {
             final DataFixer dataFixer = platform.getDataFixer();
             if (dataFixer != null) {
-                return new AnvilChunk13((CompoundTag) dataFixer.fixChunk(rootTag).getValue().get("Level"));
+                return new AnvilChunk13((CompoundTag) dataFixer.fixUp(DataFixer.FixTypes.CHUNK, rootTag, dataVersion).getValue().get("Level"));
             }
         }
         if (dataVersion >= DATA_VERSION_MC_1_13) {