Implement the replace flag for state maps

src/main/java/com/minelittlepony/unicopia/block/state/JsonReversableBlockStateConverter.java

@@ -21,7 +21,7 @@ public class JsonReversableBlockStateConverter implements ReversableBlockStateCo
 
     public JsonReversableBlockStateConverter(JsonElement json) {
         this(new ArrayList<>(), null);
-        JsonHelper.getArray(json.getAsJsonObject(), "entries").forEach(entry -> {
+        json.getAsJsonArray().forEach(entry -> {
             entries.add(Entry.of(entry.getAsJsonObject(), true));
         });
     }

src/main/java/com/minelittlepony/unicopia/block/state/StateMapLoader.java

@@ -1,20 +1,24 @@
 package com.minelittlepony.unicopia.block.state;
 
+import java.io.*;
 import java.util.*;
 import java.util.stream.Collectors;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.slf4j.Logger;
 
-import com.google.gson.JsonElement;
+import com.google.common.collect.Maps;
+import com.google.gson.*;
 import com.minelittlepony.unicopia.Unicopia;
 import com.minelittlepony.unicopia.util.Resources;
+import com.mojang.logging.LogUtils;
 
 import net.fabricmc.fabric.api.resource.IdentifiableResourceReloadListener;
 import net.minecraft.block.BlockState;
-import net.minecraft.resource.JsonDataLoader;
+import net.minecraft.resource.*;
-import net.minecraft.resource.ResourceManager;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.JsonHelper;
 import net.minecraft.util.profiler.Profiler;
 import net.minecraft.world.World;
 
@@ -23,6 +27,11 @@ public class StateMapLoader extends JsonDataLoader implements IdentifiableResour
 
     public static final StateMapLoader INSTANCE = new StateMapLoader();
 
+    private static final Logger LOGGER = LogUtils.getLogger();
+    private static final String FILE_SUFFIX = ".json";
+    private static final int FILE_SUFFIX_LENGTH = ".json".length();
+    private static final String DATA_TYPE = "state_maps";
+
     private Map<Identifier, ReversableBlockStateConverter> converters = new HashMap<>();
 
     public StateMapLoader() {
@@ -34,6 +43,46 @@ public class StateMapLoader extends JsonDataLoader implements IdentifiableResour
         return ID;
     }
 
+    @Override
+    protected Map<Identifier, JsonElement> prepare(ResourceManager resourceManager, Profiler profiler) {
+        Map<Identifier, JsonElement> map = Maps.newHashMap();
+        int i = DATA_TYPE.length() + 1;
+
+        resourceManager.findAllResources(DATA_TYPE, id -> id.getPath().endsWith(FILE_SUFFIX)).entrySet().stream().forEach(entry -> {
+            Identifier resId = entry.getKey();
+            String path = resId.getPath();
+            Identifier id = new Identifier(resId.getNamespace(), path.substring(i, path.length() - FILE_SUFFIX_LENGTH));
+
+            JsonArray entries = new JsonArray();
+            for (var resource : entry.getValue()) {
+                try (BufferedReader reader = resource.getReader()) {
+                    JsonObject json = JsonHelper.deserialize(Resources.GSON, reader, JsonObject.class);
+
+                    if (json != null) {
+                        if (json.has("entries")) {
+
+                            JsonArray incoming = JsonHelper.getArray(json, "entries");
+                            if (json.has("replace") && json.get("replace").getAsBoolean()) {
+                                entries = incoming;
+                            } else {
+                                entries.addAll(incoming);
+                            }
+                        }
+
+                        continue;
+                    }
+
+                    LOGGER.error("Couldn't load data file {} from {} as it's null or empty", id, resId);
+                } catch (JsonParseException | IOException | IllegalArgumentException e) {
+                    LOGGER.error("Couldn't parse data file {} from {}", id, resId, e);
+                }
+            }
+
+            map.put(id, entries);
+        });
+        return map;
+    }
+
     @Override
     protected void apply(Map<Identifier, JsonElement> data, ResourceManager manager, Profiler profiler) {
         converters = data.entrySet().stream().collect(Collectors.toMap(

src/main/java/com/minelittlepony/unicopia/block/state/StatePredicate.java

@@ -110,7 +110,7 @@ public abstract class StatePredicate implements Predicate<BlockState> {
         }
     }
 
-    static boolean isPlant(BlockState s) {
+    public static boolean isPlant(BlockState s) {
         return s.getBlock() instanceof PlantBlock;
     }
 
@@ -119,11 +119,11 @@ public abstract class StatePredicate implements Predicate<BlockState> {
     }
 
     public static Predicate<BlockState> ofState(String state) {
-        Identifier id = new Identifier(state.split("{")[0]);
+        Identifier id = new Identifier(state.split("\\{")[0]);
         List<PropertyOp> properties = Optional.of(state)
                 .filter(s -> s.contains("{"))
                 .stream()
-                .flatMap(s -> Stream.of(s.split("{")[1].split("}")[0].split(",")))
+                .flatMap(s -> Stream.of(s.split("\\{")[1].split("\\}")[0].split(",")))
                 .map(PropertyOp::of)
                 .filter(Optional::isPresent)
                 .map(Optional::get)

src/main/resources/data/unicopia/state_maps/ice.json

@@ -1,9 +1,15 @@
 {
-  "parent": "unicopia:snow_piled",
   "replace": false,
   "entries": [
     {
-      "match": { "state": "minecraft:water" },
+      "match": { "state": "minecraft:snow{layers<7}" },
+      "apply": {
+        "action": "unicopia:cycle_property",
+        "property": "layers"
+      }
+    },
+    {
+      "match": { "tag": "minecraft:water" },
       "apply": {
         "action": "unicopia:set_state",
         "state": "minecraft:frosted_ice"