Provide compatibility for legacy schematics that use the old sign NBT format

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

@@ -35,6 +35,8 @@ import com.sk89q.worldedit.blocks.BaseBlock;
 import com.sk89q.worldedit.entity.BaseEntity;
 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.extent.clipboard.io.legacycompat.SignCompatibilityHandler;
 import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.Location;
@@ -43,6 +45,7 @@ import com.sk89q.worldedit.world.storage.NBTConversions;
 
 import javax.annotation.Nullable;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -56,6 +59,12 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class SchematicReader implements ClipboardReader {
 
+    private static final List<NBTCompatibilityHandler> COMPATIBILITY_HANDLERS = new ArrayList<>();
+
+    static {
+        COMPATIBILITY_HANDLERS.add(new SignCompatibilityHandler());
+    }
+
     private static final Logger log = Logger.getLogger(SchematicReader.class.getCanonicalName());
     private final NBTInputStream inputStream;
 
@@ -181,6 +190,14 @@ public class SchematicReader implements ClipboardReader {
                 values.put(entry.getKey(), entry.getValue());
             }
 
+            int index = y * width * length + z * width + x;
+            BaseBlock block = new BaseBlock(blocks[index], blockData[index]);
+            for (NBTCompatibilityHandler handler : COMPATIBILITY_HANDLERS) {
+                if (handler.isAffectedBlock(block)) {
+                    handler.updateNBT(block, values);
+                }
+            }
+
             BlockVector vec = new BlockVector(x, y, z);
             tileEntitiesMap.put(vec, values);
         }

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

@@ -0,0 +1,30 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.extent.clipboard.io.legacycompat;
+
+import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.blocks.BaseBlock;
+
+import java.util.Map;
+
+public interface NBTCompatibilityHandler {
+    boolean isAffectedBlock(BaseBlock block);
+    void updateNBT(BaseBlock block, Map<String, Tag> values);
+}

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

@@ -0,0 +1,61 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.extent.clipboard.io.legacycompat;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
+import com.sk89q.jnbt.StringTag;
+import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.blocks.BlockID;
+
+import java.util.Map;
+
+public class SignCompatibilityHandler implements NBTCompatibilityHandler {
+    @Override
+    public boolean isAffectedBlock(BaseBlock block) {
+        return block.getType() == BlockID.SIGN_POST || block.getType() == BlockID.WALL_SIGN;
+    }
+
+    @Override
+    public void updateNBT(BaseBlock block, Map<String, Tag> values) {
+        for (int i = 0; i < 4; ++i) {
+            String key = "Text" + (i + 1);
+            Tag value = values.get(key);
+            if (value instanceof StringTag) {
+                String storedString = ((StringTag) value).getValue();
+                JsonElement jsonElement = new JsonParser().parse(storedString);
+                if (jsonElement.isJsonObject()) {
+                    continue;
+                }
+
+                if (jsonElement.isJsonNull()) {
+                    jsonElement = new JsonPrimitive("");
+                }
+
+                JsonObject jsonTextObject = new JsonObject();
+                jsonTextObject.add("text", jsonElement);
+                values.put("Text" + (i + 1), new StringTag(jsonTextObject.toString()));
+            }
+        }
+    }
+}