TSJ and TSV parsing (#1962)

* Deserialization support for tsv files

* Benchmarking

* Apparently moving the setter out of the lambda fixed the setAccessible issue

* Thread it

* Use AllArgsConstructor instead of field reflection

* Clean up AllArgsConstructor TSV deserialization

* Refactor TsvUtils

* Remove AllArgsConstructors from Excels

* Set field accessible

* [WIP] TSJ improvements

* [WIP] More TSV stuff

* [WIP] More TSV stuff

* Working TSV parser (slow)

* Load Excels in TSJ > JSON > TSV priority

src/main/java/emu/grasscutter/data/ResourceLoader.java

@@ -11,7 +11,10 @@ import emu.grasscutter.game.world.SpawnDataEntry;
 import emu.grasscutter.game.world.SpawnDataEntry.GridBlockId;
 import emu.grasscutter.game.world.SpawnDataEntry.SpawnGroupEntry;
 import emu.grasscutter.scripts.SceneIndexManager;
+import emu.grasscutter.utils.FileUtils;
 import emu.grasscutter.utils.JsonUtils;
+import emu.grasscutter.utils.TsvUtils;
+import it.unimi.dsi.fastutil.Pair;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntArraySet;
@@ -23,6 +26,8 @@ import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
@@ -32,8 +37,9 @@ import static emu.grasscutter.utils.Language.translate;
 
 public class ResourceLoader {
 
-    private static final List<String> loadedResources = new ArrayList<>();
+    private static final Set<String> loadedResources = new CopyOnWriteArraySet<>();
 
+    // Get a list of all resource classes, sorted by loadPriority
     public static List<Class<?>> getResourceDefClasses() {
         Reflections reflections = new Reflections(ResourceLoader.class.getPackage().getName());
         Set<?> classes = reflections.getSubTypesOf(GameResource.class);
@@ -51,6 +57,25 @@ public class ResourceLoader {
         return classList;
     }
 
+    // Get a list containing sets of all resource classes, sorted by loadPriority
+    protected static List<Set<Class<?>>> getResourceDefClassesPrioritySets() {
+        val reflections = new Reflections(ResourceLoader.class.getPackage().getName());
+        val classes = reflections.getSubTypesOf(GameResource.class);
+        val priorities = ResourceType.LoadPriority.getInOrder();
+        Grasscutter.getLogger().debug("Priorities are "+priorities);
+        val map = new LinkedHashMap<ResourceType.LoadPriority, Set<Class<?>>>(priorities.size());
+        priorities.forEach(p -> map.put(p, new HashSet<>()));
+
+        classes.forEach(c -> {
+            // val c = (Class<?>) o;
+            val annotation = c.getAnnotation(ResourceType.class);
+            if (annotation != null) {
+                map.get(annotation.loadPriority()).add(c);
+            }
+        });
+        return List.copyOf(map.values());
+    }
+
     private static boolean loadedAll = false;
     public static void loadAll() {
         if (loadedAll) return;
@@ -86,48 +111,66 @@ public class ResourceLoader {
     }
 
     public static void loadResources(boolean doReload) {
-        for (Class<?> resourceDefinition : getResourceDefClasses()) {
+        long startTime = System.nanoTime();
-            ResourceType type = resourceDefinition.getAnnotation(ResourceType.class);
+        val errors = new ConcurrentLinkedQueue<Pair<String, Exception>>();  // Logger in a parallel stream will deadlock
 
-            if (type == null) {
+        getResourceDefClassesPrioritySets().forEach(classes -> {
-                continue;
+            classes.stream()
-            }
+                .parallel().unordered()
+                .forEach(c -> {
+                    val type = c.getAnnotation(ResourceType.class);
+                    if (type == null) return;
 
-            @SuppressWarnings("rawtypes")
+                    val map = GameData.getMapByResourceDef(c);
-            Int2ObjectMap map = GameData.getMapByResourceDef(resourceDefinition);
+                    if (map == null) return;
 
-            if (map == null) {
+                    try {
-                continue;
+                        loadFromResource(c, type, map, doReload);
-            }
+                    } catch (Exception e) {
-
+                        errors.add(Pair.of(Arrays.toString(type.name()), e));
-            try {
+                    }
-                loadFromResource(resourceDefinition, type, map, doReload);
+                });
-            } catch (Exception e) {
+        });
-                Grasscutter.getLogger().error("Error loading resource file: " + Arrays.toString(type.name()), e.getLocalizedMessage());
+        errors.forEach(pair -> Grasscutter.getLogger().error("Error loading resource file: " + pair.left(), pair.right()));
-            }
+        long endTime = System.nanoTime();
-        }
+        long ns = (endTime - startTime);  //divide by 1000000 to get milliseconds.
+        Grasscutter.getLogger().debug("Loading resources took "+ns+"ns == "+ns/1000000+"ms");
     }
 
     @SuppressWarnings("rawtypes")
     protected static void loadFromResource(Class<?> c, ResourceType type, Int2ObjectMap map, boolean doReload) throws Exception {
-        if (!loadedResources.contains(c.getSimpleName()) || doReload) {
+        val simpleName = c.getSimpleName();
+        if (doReload || !loadedResources.contains(simpleName)) {
             for (String name : type.name()) {
-                loadFromResource(c, name, map);
+                loadFromResource(c, FileUtils.getExcelPath(name), map);
             }
-            loadedResources.add(c.getSimpleName());
+            loadedResources.add(simpleName);
-            Grasscutter.getLogger().debug("Loaded " + map.size() + " " + c.getSimpleName() + "s.");
         }
     }
 
     @SuppressWarnings({"rawtypes", "unchecked"})
-    protected static <T> void loadFromResource(Class<T> c, String fileName, Int2ObjectMap map) throws Exception {
+    protected static <T> void loadFromResource(Class<T> c, Path filename, Int2ObjectMap map) throws Exception {
-        List<T> list = JsonUtils.loadToList(getResourcePath("ExcelBinOutput/" + fileName), c);
+        val results = switch (FileUtils.getFileExtension(filename)) {
-
+            case "json" -> JsonUtils.loadToList(filename, c);
-        for (T o : list) {
+            case "tsj" -> TsvUtils.loadTsjToListSetField(c, filename);
+            case "tsv" -> TsvUtils.loadTsvToListSetField(c, filename);
+            default -> null;
+        };
+        if (results == null) return;
+        results.forEach(o -> {
             GameResource res = (GameResource) o;
             res.onLoad();
             map.put(res.getId(), res);
-        }
+        });
+    }
+
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    protected static <T> void loadFromResource(Class<T> c, String fileName, Int2ObjectMap map) throws Exception {
+        JsonUtils.loadToList(getResourcePath("ExcelBinOutput/" + fileName), c).forEach(o -> {
+            GameResource res = (GameResource) o;
+            res.onLoad();
+            map.put(res.getId(), res);
+        });
     }
 
     public class ScenePointConfig {  // Sadly this doesn't work as a local class in loadScenePoints()

src/main/java/emu/grasscutter/data/ResourceType.java

@@ -2,6 +2,8 @@ package emu.grasscutter.data;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.List;
+import java.util.stream.Stream;
 
 @Retention(RetentionPolicy.RUNTIME) 
 public @interface ResourceType {
@@ -28,5 +30,9 @@ public @interface ResourceType {
 		public int value() {
 			return value;
 		}
+
+        public static List<LoadPriority> getInOrder() {
+            return Stream.of(LoadPriority.values()).sorted((x, y) -> y.value() - x.value()).toList();
+        }
 	}
 }

src/main/java/emu/grasscutter/data/excels/ActivityWatcherData.java

@@ -21,7 +21,7 @@ public class ActivityWatcherData extends GameResource {
 
     @Override
     public void onLoad() {
-        triggerConfig.paramList = triggerConfig.paramList.stream().filter(x -> !x.isBlank()).toList();
+        triggerConfig.paramList = triggerConfig.paramList.stream().filter(x -> (x != null) && !x.isBlank()).toList();
         triggerConfig.watcherTriggerType = WatcherTriggerType.getTypeByName(triggerConfig.triggerType);
     }
 

src/main/java/emu/grasscutter/data/excels/BattlePassMissionData.java

@@ -40,8 +40,11 @@ public class BattlePassMissionData extends GameResource {
 
     @Override
     public void onLoad() {
-        if (this.getTriggerConfig() != null && getTriggerConfig().getParamList()[0].length() > 0) {
+        if (this.getTriggerConfig() != null) {
-            this.mainParams = Arrays.stream(getTriggerConfig().getParamList()[0].split("[:;,]")).map(Integer::parseInt).collect(Collectors.toSet());
+            var params = getTriggerConfig().getParamList()[0];
+            if ((params != null) && !params.isEmpty()) {
+                this.mainParams = Arrays.stream(params.split("[:;,]")).map(Integer::parseInt).collect(Collectors.toSet());
+            }
         }
     }
 

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddExp.java

@@ -1,19 +1,18 @@
 package emu.grasscutter.game.props.ItemUseAction;
 
 import emu.grasscutter.game.props.ItemUseOp;
-import lombok.Getter;
-
-public class ItemUseAddExp extends ItemUseAction {
-    @Getter private int exp = 0;
 
+public class ItemUseAddExp extends ItemUseInt {
     @Override
     public ItemUseOp getItemUseOp() {
         return ItemUseOp.ITEM_USE_ADD_EXP;
     }
 
     public ItemUseAddExp(String[] useParam) {
-        try {
+        super(useParam);
-            this.exp = Integer.parseInt(useParam[0]);
+    }
-        } catch (NumberFormatException ignored) {}
+
+    public int getExp() {
+        return this.i;
     }
 }

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddItem.java

@@ -14,7 +14,7 @@ public class ItemUseAddItem extends ItemUseInt {
         super(useParam);
         try {
             this.count = Integer.parseInt(useParam[1]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
     }
 
     @Override

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddReliquaryExp.java

@@ -1,19 +1,14 @@
 package emu.grasscutter.game.props.ItemUseAction;
 
 import emu.grasscutter.game.props.ItemUseOp;
-import lombok.Getter;
-
-public class ItemUseAddReliquaryExp extends ItemUseAction {
-    @Getter private int exp = 0;
 
+public class ItemUseAddReliquaryExp extends ItemUseAddExp {
     @Override
     public ItemUseOp getItemUseOp() {
         return ItemUseOp.ITEM_USE_ADD_RELIQUARY_EXP;
     }
 
     public ItemUseAddReliquaryExp(String[] useParam) {
-        try {
+        super(useParam);
-            this.exp = Integer.parseInt(useParam[0]);
-        } catch (NumberFormatException ignored) {}
     }
 }

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddServerBuff.java

@@ -14,7 +14,7 @@ public class ItemUseAddServerBuff extends ItemUseInt {
         super(useParam);
         try {
             this.duration = Integer.parseInt(useParam[1]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
     }
 
     @Override

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddWeaponExp.java

@@ -1,19 +1,14 @@
 package emu.grasscutter.game.props.ItemUseAction;
 
 import emu.grasscutter.game.props.ItemUseOp;
-import lombok.Getter;
-
-public class ItemUseAddWeaponExp extends ItemUseAction {
-    @Getter private int exp = 0;
 
+public class ItemUseAddWeaponExp extends ItemUseAddExp {
     @Override
     public ItemUseOp getItemUseOp() {
         return ItemUseOp.ITEM_USE_ADD_WEAPON_EXP;
     }
 
     public ItemUseAddWeaponExp(String[] useParam) {
-        try {
+        super(useParam);
-            this.exp = Integer.parseInt(useParam[0]);
-        } catch (NumberFormatException ignored) {}
     }
 }

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseCombineItem.java

@@ -15,10 +15,10 @@ public class ItemUseCombineItem extends ItemUseInt {
         super(useParam);
         try {
             this.resultId = Integer.parseInt(useParam[1]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
         try {
             this.resultCount = Integer.parseInt(useParam[2]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
     }
 
     @Override

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseGainAvatar.java

@@ -19,10 +19,10 @@ public class ItemUseGainAvatar extends ItemUseInt {
         super(useParam);
         try {
             this.level = Integer.parseInt(useParam[1]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
         try {
             this.constellation = Integer.parseInt(useParam[2]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
     }
 
     @Override

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseInt.java

@@ -8,6 +8,6 @@ public abstract class ItemUseInt extends ItemUseAction {
     public ItemUseInt(String[] useParam) {
         try {
             this.i = Integer.parseInt(useParam[0]);
-        } catch (NumberFormatException ignored) {}
+        } catch (NumberFormatException | ArrayIndexOutOfBoundsException ignored) {}
     }
 }

src/main/java/emu/grasscutter/utils/FileUtils.java

@@ -1,6 +1,7 @@
 package emu.grasscutter.utils;
 
 import emu.grasscutter.Grasscutter;
+import lombok.val;
 
 import java.io.File;
 import java.io.IOException;
@@ -111,6 +112,24 @@ public final class FileUtils {
         return RESOURCES_PATH.resolve(path);
     }
 
+    public static Path getExcelPath(String filename) {
+        return getTsjJsonTsv(RESOURCES_PATH.resolve("ExcelBinOutput"), filename);
+    }
+
+    // Gets path of a resource.
+    // If multiple formats of it exist, priority is TSJ > JSON > TSV
+    // If none exist, return the TSJ path, in case it wants to create a file
+    public static Path getTsjJsonTsv(Path root, String filename) {
+        val name = getFilenameWithoutExtension(filename);
+        val tsj = root.resolve(name + ".tsj");
+        if (Files.exists(tsj)) return tsj;
+        val json = root.resolve(name + ".json");
+        if (Files.exists(json)) return json;
+        val tsv = root.resolve(name + ".tsv");
+        if (Files.exists(tsv)) return tsv;
+        return tsj;
+    }
+
     public static Path getScriptPath(String path) {
         return SCRIPTS_PATH.resolve(path);
     }
@@ -167,14 +186,19 @@ public final class FileUtils {
         }
     }
 
-    @Deprecated  // No current uses of this anyway
+    @Deprecated  // Misnamed legacy function
-    public static String getFilenameWithoutPath(String fileName) {
+    public static String getFilenameWithoutPath(String filename) {
-        int i = fileName.lastIndexOf(".");
+        return getFilenameWithoutExtension(filename);
-        if (i > 0) {
+    }
-           return fileName.substring(0, i);
+    public static String getFilenameWithoutExtension(String filename) {
-        } else {
+        int i = filename.lastIndexOf(".");
-           return fileName;
+        return (i < 0) ? filename : filename.substring(0, i);
-        }
+    }
+
+    public static String getFileExtension(Path path) {
+        val filename = path.toString();
+        int i = filename.lastIndexOf(".");
+        return (i < 0) ? "" : filename.substring(i+1);
     }
 
     public static List<Path> getPathsFromResource(String folder) throws URISyntaxException {

src/main/java/emu/grasscutter/utils/JsonUtils.java

@@ -4,6 +4,7 @@ import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
+import java.lang.reflect.Type;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -18,6 +19,7 @@ import com.google.gson.reflect.TypeToken;
 
 import emu.grasscutter.data.common.DynamicFloat;
 import emu.grasscutter.utils.JsonAdapters.*;
+
 import it.unimi.dsi.fastutil.ints.IntList;
 
 public final class JsonUtils {
@@ -102,4 +104,12 @@ public final class JsonUtils {
             return null;
         }
     }
+
+    public static <T> T decode(String jsonData, Type type) {
+        try {
+            return gson.fromJson(jsonData, type);
+        } catch (Exception ignored) {
+            return null;
+        }
+    }
 }

src/main/java/emu/grasscutter/utils/TsvUtils.java

@@ -0,0 +1,596 @@
+package emu.grasscutter.utils;
+
+import java.io.IOException;
+import java.lang.reflect.Array;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.function.Function;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.annotations.SerializedName;
+
+import emu.grasscutter.Grasscutter;
+import it.unimi.dsi.fastutil.Pair;
+import it.unimi.dsi.fastutil.ints.Int2ObjectRBTreeMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectSortedMap;
+import it.unimi.dsi.fastutil.objects.Object2IntArrayMap;
+import lombok.val;
+
+import static emu.grasscutter.utils.Utils.nonRegexSplit;
+
+// Throughout this file, commented System.out.println debug log calls are left in.
+// This is because the default logger will deadlock when operating on parallel streams.
+public class TsvUtils {
+    private static final Map<Type, Object> defaultValues = Map.ofEntries(
+        // Map.entry(String.class, null),  // builder hates null values
+        Map.entry(Integer.class, 0),
+        Map.entry(int.class, 0),
+        Map.entry(Long.class, 0L),
+        Map.entry(long.class, 0L),
+        Map.entry(Float.class, 0f),
+        Map.entry(float.class, 0f),
+        Map.entry(Double.class, 0d),
+        Map.entry(double.class, 0d),
+        Map.entry(Boolean.class, false),
+        Map.entry(boolean.class, false)
+    );
+    private static final Set<Type> primitiveTypes = Set.of(String.class, Integer.class, int.class, Long.class, long.class, Float.class, float.class, Double.class, double.class, Boolean.class, boolean.class);
+
+    private static final Function<String, Object> parseString = value -> value;
+    private static final Function<String, Object> parseInt = value -> (int) Double.parseDouble(value);  //Integer::parseInt;
+    private static final Function<String, Object> parseLong = value -> (long) Double.parseDouble(value);  //Long::parseLong;
+    private static Map<Type, Function<String, Object>> primitiveTypeParsers = Map.ofEntries(
+        Map.entry(String.class, parseString),
+        Map.entry(Integer.class, parseInt),
+        Map.entry(int.class, parseInt),
+        Map.entry(Long.class, parseLong),
+        Map.entry(long.class, parseLong),
+        Map.entry(Float.class, Float::parseFloat),
+        Map.entry(float.class, Float::parseFloat),
+        Map.entry(Double.class, Double::parseDouble),
+        Map.entry(double.class, Double::parseDouble),
+        Map.entry(Boolean.class, Boolean::parseBoolean),
+        Map.entry(boolean.class, Boolean::parseBoolean)
+    );
+    private static final Map<Type, Function<String, Object>> typeParsers = new HashMap<>(primitiveTypeParsers);
+
+    @SuppressWarnings("unchecked")
+    private static <T> T parsePrimitive(Class<T> type, String string) {
+        if (string == null || string.isEmpty()) return (T) defaultValues.get(type);
+        return (T) primitiveTypeParsers.get(type).apply(string);
+    }
+    // This is more expensive than parsing as the correct types, but it is more tolerant of mismatched data like ints with .0
+    private static double parseNumber(String string) {
+        if (string == null || string.isEmpty()) return 0d;
+        return Double.parseDouble(string);
+    }
+    @SuppressWarnings("unchecked")
+    private static <T> T parseEnum(Class<T> enumType, String string) {
+        if (string == null || string.isEmpty()) return null;
+        return (T) getEnumTypeParser(enumType).apply(string);
+    }
+
+    // This is idiotic. I hate it. I'll have to look into how Gson beats the JVM into submission over classes where reflection magically fails to find the NoArgsConstructor later.
+    public static <T> T newObj(Class<T> objClass) {
+        try {
+            return objClass.getDeclaredConstructor().newInstance();
+        } catch (Exception ignored) {
+            return JsonUtils.decode("{}", objClass);
+        }
+    }
+
+    private static final Map<Class<?>, Function<String, Object>> enumTypeParsers = new HashMap<>();
+    @SuppressWarnings("deprecated")  // Field::isAccessible is deprecated because it doesn't do what people think it does. It does what we want it to, however.
+    private static Function<String, Object> makeEnumTypeParser(Class<?> enumClass) {
+        if (!enumClass.isEnum()) {
+            // System.out.println("Called makeEnumTypeParser with non-enum enumClass "+enumClass);
+            return null;
+        }
+
+        // Make mappings of (string) names to enum constants
+        val map = new HashMap<String, Object>();
+        val enumConstants = enumClass.getEnumConstants();
+        for (val constant : enumConstants)
+            map.put(constant.toString(), constant);
+
+        // If the enum also has a numeric value, map those to the constants too
+        // System.out.println("Looking for enum value field");
+        for (Field f : enumClass.getDeclaredFields()) {
+            if (switch (f.getName()) {case "value", "id" -> true; default -> false;}) {
+                // System.out.println("Enum value field found - " + f.getName());
+                boolean acc = f.isAccessible();
+                f.setAccessible(true);
+                try {
+                    for (val constant : enumConstants)
+                        map.put(String.valueOf(f.getInt(constant)), constant);
+                } catch (IllegalAccessException e) {
+                    // System.out.println("Failed to access enum id field.");
+                }
+                f.setAccessible(acc);
+                break;
+            }
+        }
+        return map::get;
+    }
+    private static synchronized Function<String, Object> getEnumTypeParser(Class<?> enumType) {
+        if (enumType == null) {
+            // System.out.println("Called getEnumTypeParser with null enumType");
+            return null;
+        }
+        return enumTypeParsers.computeIfAbsent(enumType, TsvUtils::makeEnumTypeParser);
+    }
+
+    private static synchronized Function<String, Object> getTypeParser(Type type) {
+        if (type == null) return parseString;
+        return typeParsers.computeIfAbsent(type, t -> value -> JsonUtils.decode(value, t));
+    }
+
+    private static Type class2Type(Class<?> classType) {
+        return (Type) classType.getGenericSuperclass();
+    }
+    private static Class<?> type2Class(Type type) {
+        if (type instanceof Class) {
+            return (Class<?>) type;
+        } else if (type instanceof ParameterizedType) {
+            return (Class<?>) ((ParameterizedType) type).getRawType();
+        } else {
+            return type.getClass();  // Probably incorrect
+        }
+    }
+
+    // A helper object that contains a Field and the function to parse a String to create the value for the Field.
+    private static class FieldParser {
+        public final Field field;
+        public final Type type;
+        public final Class<?> classType;
+        public final Function<String, Object> parser;
+
+        FieldParser(Field field) {
+            this.field = field;
+            this.type = field.getGenericType();  // returns specialized type info e.g. java.util.List<java.lang.Integer>
+            this.classType = field.getType();
+            this.parser = getTypeParser(this.type);
+        }
+
+        public Object parse(String token) {
+            return this.parser.apply(token);
+        }
+
+        public void parse(Object obj, String token) throws IllegalAccessException {
+            this.field.set(obj, this.parser.apply(token));
+        }
+    }
+
+    private static Map<String, FieldParser> makeClassFieldMap(Class<?> classType) {
+        val fieldMap = new HashMap<String, FieldParser>();
+        for (Field field : classType.getDeclaredFields()) {
+            field.setAccessible(true);  // Yes, we don't bother setting this back. No, it doesn't matter for this project.
+            val fieldParser = new FieldParser(field);
+
+            val a = field.getDeclaredAnnotation(SerializedName.class);
+            if (a == null) {  // No annotation, use raw field name
+                fieldMap.put(field.getName(), fieldParser);
+            } else {  // Handle SerializedNames and alternatives
+                fieldMap.put(a.value(), fieldParser);
+                for (val alt : a.alternate()) {
+                    fieldMap.put(alt, fieldParser);
+                }
+            }
+        }
+        return fieldMap;
+    }
+
+    private static Map<Class<?>, Map<String, FieldParser>> cachedClassFieldMaps = new HashMap<>();
+    private static synchronized Map<String, FieldParser> getClassFieldMap(Class<?> classType) {
+        return cachedClassFieldMaps.computeIfAbsent(classType, TsvUtils::makeClassFieldMap);
+    }
+
+    private static class StringTree {
+        public final Map<String, StringTree> children = new TreeMap<>();
+
+        public void addPath(String path) {
+            if (path.isEmpty()) return;
+
+            val firstDot = path.indexOf('.');
+            val fieldPath = (firstDot < 0) ? path : path.substring(0, firstDot);
+            val remainder = (firstDot < 0) ? "" : path.substring(firstDot+1);
+            this.children.computeIfAbsent(fieldPath, k -> new StringTree()).addPath(remainder);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private static class StringValueTree {
+        public final SortedMap<String, StringValueTree> children = new TreeMap<>();
+        public final Int2ObjectSortedMap<StringValueTree> arrayChildren = new Int2ObjectRBTreeMap<>();
+        public String value;
+
+        public StringValueTree(StringTree from) {
+            from.children.forEach((k,v) -> {
+                try {
+                    this.arrayChildren.put(Integer.parseInt(k), new StringValueTree(v));
+                } catch (NumberFormatException e) {
+                    this.children.put(k, new StringValueTree(v));
+                }
+            });
+        }
+
+        public void setValue(String path, String value) {
+            if (path.isEmpty()) {
+                this.value = value;
+                return;
+            }
+
+            val firstDot = path.indexOf('.');
+            val fieldPath = (firstDot < 0) ? path : path.substring(0, firstDot);
+            val remainder = (firstDot < 0) ? "" : path.substring(firstDot+1);
+            try {
+                this.arrayChildren.get(Integer.parseInt(fieldPath)).setValue(remainder, value);
+            } catch (NumberFormatException e) {
+                this.children.get(fieldPath).setValue(remainder, value);
+            }
+        }
+
+        public JsonElement toJson() {
+            // Determine if this is an object, an array, or a value
+            if (this.value != null) {  // 
+                return new JsonPrimitive(this.value);
+            }
+            if (!this.arrayChildren.isEmpty()) {
+                val arr = new JsonArray(this.arrayChildren.lastIntKey()+1);
+                arrayChildren.forEach((k,v) -> arr.set(k, v.toJson()));
+                return arr;
+            } else if (this.children.isEmpty()) {
+                return JsonNull.INSTANCE;
+            } else {
+                val obj = new JsonObject();
+                children.forEach((k,v) -> {
+                    val j = v.toJson();
+                    if (j != JsonNull.INSTANCE)
+                        obj.add(k, v.toJson());
+                });
+                return obj;
+            }
+        }
+
+        public <T> T toClass(Class<T> classType, Type type) {
+            // System.out.println("toClass called with Class: "+classType+" \tType: "+type);
+            if (type == null)
+                type = class2Type(classType);
+
+            if (primitiveTypeParsers.containsKey(classType)) {
+                return parsePrimitive(classType, this.value);
+            } else if (classType.isEnum()) {
+                return parseEnum(classType, this.value);
+            } else if (classType.isArray()) {
+                return this.toArray(classType);
+            } else if (List.class.isAssignableFrom(classType)) {
+                // if (type instanceof ParameterizedType)
+                val elementType = ((ParameterizedType) type).getActualTypeArguments()[0];
+                return (T) this.toList(type2Class(elementType), elementType);
+            } else if (Map.class.isAssignableFrom(classType)) {
+                // System.out.println("Class: "+classType+" \tClassTypeParams: "+Arrays.toString(classType.getTypeParameters())+" \tType: "+type+" \tTypeArguments: "+Arrays.toString(((ParameterizedType) type).getActualTypeArguments()));
+                // if (type instanceof ParameterizedType)
+                val keyType = ((ParameterizedType) type).getActualTypeArguments()[0];
+                val valueType = ((ParameterizedType) type).getActualTypeArguments()[1];
+                return (T) this.toMap(type2Class(keyType), type2Class(valueType), valueType);
+            } else {
+                return this.toObj(classType, type);
+            }
+        }
+
+        private <T> T toObj(Class<T> objClass, Type objType) {
+            try {
+                // val obj = objClass.getDeclaredConstructor().newInstance();
+                val obj = newObj(objClass);
+                val fieldMap = getClassFieldMap(objClass);
+                this.children.forEach((name, tree) -> {
+                    val field = fieldMap.get(name);
+                    if (field == null) return;
+                    try {
+                        if (primitiveTypes.contains(field.type)) {
+                            if ((tree.value != null) && !tree.value.isEmpty())
+                                field.parse(obj, tree.value);
+                        } else {
+                            val value = tree.toClass(field.classType, field.type);
+                            // System.out.println("Setting field "+name+" to "+value);
+                            field.field.set(obj, value);
+                            // field.field.set(obj, tree.toClass(field.classType, field.type));
+                        }
+                    } catch (Exception e) {
+                        // System.out.println("Exception while setting field "+name+" for class "+objClass+" - "+e);
+                        Grasscutter.getLogger().error("Exception while setting field "+name+" ("+field.classType+")"+" for class "+objClass+" - ",e);
+                    }
+                });
+                return obj;
+            } catch (Exception e) {
+                // System.out.println("Exception while creating object of class "+objClass+" - "+e);
+                Grasscutter.getLogger().error("Exception while creating object of class "+objClass+" - ",e);
+                return null;
+            }
+        }
+
+        public <T> T toArray(Class<T> classType) {
+            // Primitives don't play so nice with generics, so we handle all of them individually.
+            val containedClass = classType.getComponentType();
+            // val arraySize = this.arrayChildren.size();  // Assume dense 0-indexed
+            val arraySize = this.arrayChildren.lastIntKey()+1;  // Could be sparse!
+            // System.out.println("toArray called with Class: "+classType+" \tContains: "+containedClass+" \tof size: "+arraySize);
+            if (containedClass == int.class) {
+                val output = new int[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (int) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == long.class) {
+                val output = new long[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (long) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == float.class) {
+                val output = new float[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (float) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == double.class) {
+                val output = new double[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (double) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == byte.class) {
+                val output = new byte[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (byte) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == char.class) {
+                val output = new char[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (char) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == short.class) {
+                val output = new short[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> output[idx] = (short) parseNumber(tree.value));
+                return (T) output;
+            } else if (containedClass == boolean.class) {
+                val output = new boolean[arraySize];
+                this.arrayChildren.forEach((idx, tree) -> {
+                    val value = ((tree.value == null) || tree.value.isEmpty()) ? false : Boolean.parseBoolean(tree.value);
+                    output[idx] = value;
+                });
+                return (T) output;
+            } else {
+                val output = Array.newInstance(containedClass, arraySize);
+                this.arrayChildren.forEach((idx, tree) -> ((Object[]) output)[idx] = tree.toClass(containedClass, null));
+                return (T) output;
+            }
+        }
+
+        private <E> List<E> toList(Class<E> valueClass, Type valueType) {
+            val arraySize = this.arrayChildren.lastIntKey()+1;  // Could be sparse!
+            // System.out.println("toList called with valueClass: "+valueClass+" \tvalueType: "+valueType+" \tof size: "+arraySize);
+            val list = new ArrayList<E>(arraySize);
+            // Safe sparse version
+            for (int i = 0; i < arraySize; i++)
+                list.add(null);
+            this.arrayChildren.forEach((idx, tree) -> list.set(idx, tree.toClass(valueClass, valueType)));
+            return list;
+        }
+
+        private <K,V> Map<K,V> toMap(Class<K> keyClass, Class<V> valueClass, Type valueType) {
+            val map = new HashMap<K,V>();
+            val keyParser = getTypeParser(keyClass);
+            this.children.forEach((key, tree) -> {
+                if ((key != null) && !key.isEmpty())
+                    map.put((K) keyParser.apply(key), tree.toClass(valueClass, valueType));
+            });
+            return map;
+        }
+    }
+
+    // Flat tab-separated value tables.
+    // Arrays are represented as arrayName.0, arrayName.1, etc. columns.
+    // Maps/POJOs are represented as objName.fieldOneName, objName.fieldTwoName, etc. columns.
+    // This is currently about 25x as slow as TSJ and Gson parsers, likely due to the tree spam.
+    public static <T> List<T> loadTsvToListSetField(Class<T> classType, Path filename) {
+        try (val fileReader = Files.newBufferedReader(filename, StandardCharsets.UTF_8)) {
+            // val fieldMap = getClassFieldMap(classType);
+            // val constructor = classType.getDeclaredConstructor();
+
+            val headerNames = nonRegexSplit(fileReader.readLine(), '\t');
+            val columns = headerNames.size();
+            // If we just crawled through all fields to expand potential subobjects, we might hit recursive data structure explosions (e.g. if something has a Player object)
+            // So we'll only crawl through objects referenced by the header columns
+            val stringTree = new StringTree();
+            headerNames.forEach(stringTree::addPath);
+
+            return fileReader.lines().parallel().map(line -> {
+            // return fileReader.lines().map(line -> {
+                // System.out.println("Processing line of "+filename+" - "+line);
+                val tokens = nonRegexSplit(line, '\t');
+                val m = Math.min(tokens.size(), columns);
+                int t = 0;
+                StringValueTree tree = new StringValueTree(stringTree);
+                try {
+                    for (t = 0; t < m; t++) {
+                        String token = tokens.get(t);
+                        if (!token.isEmpty()) {
+                            tree.setValue(headerNames.get(t), token);
+                        }
+                    }
+                    // return JsonUtils.decode(tree.toJson(), classType);
+                    return tree.toClass(classType, null);
+                } catch (Exception e) {
+                    Grasscutter.getLogger().warn("Error deserializing an instance of class "+classType.getCanonicalName());
+                    Grasscutter.getLogger().warn("At token #"+t+" of #"+m);
+                    Grasscutter.getLogger().warn("Header names are: "+headerNames.toString());
+                    Grasscutter.getLogger().warn("Tokens are: "+tokens.toString());
+                    Grasscutter.getLogger().warn("Stacktrace is: ", e);
+                    // System.out.println("Error deserializing an instance of class "+classType.getCanonicalName());
+                    // System.out.println("At token #"+t+" of #"+m);
+                    // System.out.println("Header names are: "+headerNames.toString());
+                    // System.out.println("Tokens are: "+tokens.toString());
+                    // System.out.println("Json is: "+tree.toJson().toString());
+                    // System.out.println("Stacktrace is: "+ e);
+                    return null;
+                }
+            }).toList();
+        } catch (Exception e) {
+            Grasscutter.getLogger().error("Error loading TSV file '"+filename+"' - Stacktrace is: ", e);
+            return null;
+        }
+    }
+
+    // This uses a hybrid format where columns can hold JSON-encoded values.
+    // I'll term it TSJ (tab-separated JSON) for now, it has convenient properties.
+    public static <T> List<T> loadTsjToListSetField(Class<T> classType, Path filename) {
+        try (val fileReader = Files.newBufferedReader(filename, StandardCharsets.UTF_8)) {
+            val fieldMap = getClassFieldMap(classType);
+            val constructor = classType.getDeclaredConstructor();
+
+            val headerNames = nonRegexSplit(fileReader.readLine(), '\t');
+            val columns = headerNames.size();
+            val fieldParsers = headerNames.stream().map(fieldMap::get).toList();
+
+            return fileReader.lines().parallel().map(line -> {
+                val tokens = nonRegexSplit(line, '\t');
+                val m = Math.min(tokens.size(), columns);
+                int t = 0;
+                try {
+                    T obj = constructor.newInstance();
+                    for (t = 0; t < m; t++) {
+                        val fieldParser = fieldParsers.get(t);
+                        if (fieldParser == null) continue;
+
+                        String token = tokens.get(t);
+                        if (!token.isEmpty()) {
+                            fieldParser.parse(obj, token);
+                        }
+                    }
+                    return obj;
+                } catch (Exception e) {
+                    Grasscutter.getLogger().warn("Error deserializing an instance of class "+classType.getCanonicalName());
+                    Grasscutter.getLogger().warn("At token #"+t+" of #"+m);
+                    Grasscutter.getLogger().warn("Header names are: "+headerNames.toString());
+                    Grasscutter.getLogger().warn("Tokens are: "+tokens.toString());
+                    Grasscutter.getLogger().warn("Stacktrace is: ", e);
+                    return null;
+                }
+            }).toList();
+        } catch (IOException e) {
+            Grasscutter.getLogger().error("Error loading TSV file '"+filename+"' - Stacktrace is: ", e);
+            return null;
+        } catch (NoSuchMethodException e) {
+            Grasscutter.getLogger().error("Error loading TSV file '"+filename+"' - Class is missing NoArgsConstructor");
+            return null;
+        }
+    }
+
+
+
+    // -----------------------------------------------------------------
+    // Everything below here is for the AllArgsConstructor TSJ parser
+    // -----------------------------------------------------------------
+    // Sadly, this is a little bit slower than the SetField version.
+    // I've left it in as an example of an optimization attempt that didn't work out, since the naive reflection version will tempt people to try things like this.
+    @SuppressWarnings("unchecked")
+    private static <T> Pair<Constructor<T>, String[]> getAllArgsConstructor(Class<T> classType) {
+        for (var c : classType.getDeclaredConstructors()) {
+            val consParameters = (java.beans.ConstructorProperties) c.getAnnotation(java.beans.ConstructorProperties.class);
+            if (consParameters != null) {
+                return Pair.of((Constructor<T>) c, consParameters.value());
+            }
+        }
+        return null;
+    }
+
+    public static <T> List<List<T>> loadTsjsToListsConstructor(Class<T> classType, Path... filenames) throws Exception {
+        val pair = getAllArgsConstructor(classType);
+        if (pair == null) {
+            Grasscutter.getLogger().error("No AllArgsContructor found for class: "+classType);
+            return null;
+        }
+        val constructor = pair.left();
+        val conArgNames = pair.right();
+        val numArgs = constructor.getParameterCount();
+
+        val argMap = new Object2IntArrayMap<String>();
+        for (int i = 0; i < conArgNames.length; i++) {
+            argMap.put(conArgNames[i], i);
+        }
+
+        val argTypes = new Type[numArgs];  // constructor.getParameterTypes() returns base types like java.util.List instead of java.util.List<java.lang.Integer>
+        for (Field field : classType.getDeclaredFields()) {
+            int index = argMap.getOrDefault(field.getName(), -1);
+            if (index < 0) continue;
+
+            argTypes[index] = field.getGenericType();  // returns specialized type info e.g. java.util.List<java.lang.Integer>
+
+            val a = field.getDeclaredAnnotation(SerializedName.class);
+            if (a != null) {  // Handle SerializedNames and alternatives
+                argMap.put(a.value(), index);
+                for (val alt : a.alternate()) {
+                    argMap.put(alt, index);
+                }
+            }
+        }
+        val argParsers = Stream.of(argTypes).map(TsvUtils::getTypeParser).toList();
+
+        val defaultArgs = new Object[numArgs];
+        for (int i = 0; i < numArgs; i++) {
+            defaultArgs[i] = defaultValues.get(argTypes[i]);
+        }
+
+        return Stream.of(filenames).parallel().map(filename -> {
+            try (val fileReader = Files.newBufferedReader(filename, StandardCharsets.UTF_8)) {
+                val headerNames = nonRegexSplit(fileReader.readLine(), '\t');
+                val columns = headerNames.size();
+                val argPositions = headerNames.stream().mapToInt(name -> argMap.getOrDefault(name, -1)).toArray();
+
+                return fileReader.lines().parallel().map(line -> {
+                    val tokens = nonRegexSplit(line, '\t');
+                    val args = defaultArgs.clone();
+                    val m = Math.min(tokens.size(), columns);
+                    int t = 0;
+                    try {
+                        for (t = 0; t < m; t++) {
+                            val argIndex = argPositions[t];
+                            if (argIndex < 0) continue;
+
+                            String token = tokens.get(t);
+                            if (!token.isEmpty()) {
+                                args[argIndex] = argParsers.get(argIndex).apply(token);
+                            }
+                        }
+                        return (T) constructor.newInstance(args);
+                    } catch (Exception e) {
+                        Grasscutter.getLogger().warn("Error deserializing an instance of class "+classType.getCanonicalName()+" : "+constructor.getName());
+                        Grasscutter.getLogger().warn("At token #"+t+" of #"+m);
+                        Grasscutter.getLogger().warn("Arg names are: "+Arrays.toString(conArgNames));
+                        Grasscutter.getLogger().warn("Arg types are: "+Arrays.toString(argTypes));
+                        Grasscutter.getLogger().warn("Default Args are: "+Arrays.toString(defaultArgs));
+                        Grasscutter.getLogger().warn("Args are: "+Arrays.toString(args));
+                        Grasscutter.getLogger().warn("Header names are: "+headerNames.toString());
+                        Grasscutter.getLogger().warn("Header types are: "+IntStream.of(argPositions).mapToObj(i -> (i >= 0) ? argTypes[i] : null).toList());
+                        Grasscutter.getLogger().warn("Tokens are: "+tokens.toString());
+                        Grasscutter.getLogger().warn("Stacktrace is: ", e);
+                        return null;
+                    }
+                }).toList();
+            } catch (IOException e) {
+                Grasscutter.getLogger().error("Error loading TSV file '"+filename+"' - Stacktrace is: ", e);
+                return null;
+            }
+        }).toList();
+    }
+}

src/main/java/emu/grasscutter/utils/Utils.java

@@ -395,4 +395,22 @@ public final class Utils {
     public static <T> T drawRandomListElement(List<T> list) {
         return drawRandomListElement(list, null);
     }
+
+    /***
+     * Splits a string by a character, into a list
+     * @param input The string to split
+     * @param separator The character to use as the split points
+     * @return A list of all the substrings
+     */
+    public static List<String> nonRegexSplit(String input, int separator) {
+        var output = new ArrayList<String>();
+        int start = 0;
+        for (int next = input.indexOf(separator); next > 0; next = input.indexOf(separator, start)) {
+            output.add(input.substring(start, next));
+            start = next + 1;
+        }
+        if (start < input.length())
+            output.add(input.substring(start));
+        return output;
+    }
 }