Replace Lua with Groovy and add test scripts

Author: stringfromjava

assets/new_screen.groovy

@@ -0,0 +1,54 @@
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.Input
+import com.badlogic.gdx.graphics.Color
+import com.badlogic.gdx.graphics.Texture
+import com.badlogic.gdx.graphics.g2d.Sprite
+import me.stringfromjava.funkin.Funkin
+import me.stringfromjava.funkin.backend.display.FunkinScreen
+import me.stringfromjava.funkin.backend.system.Paths
+
+Funkin.Signals.postRender.add { params ->
+  if (Gdx.input.isKeyJustPressed(Input.Keys.P)) {
+    Funkin.setScreen(new ScriptedScreen())
+  }
+}
+
+class ScriptedScreen extends FunkinScreen {
+
+  private Sprite sprite
+
+  ScriptedScreen() {
+    super()
+    println('a new scripted screen was just created!')
+  }
+
+  @Override
+  void show() {
+    super.show()
+
+    bgColor = new Color(1, 0, 0, 1)
+
+    sprite = new Sprite(new Texture(Paths.image('notes')))
+    add(sprite)
+
+    Funkin.playMusic("songs/darnell/Inst.ogg")
+  }
+
+  @Override
+  void render(float delta) {
+    super.render(delta)
+
+    if (Gdx.input.isKeyPressed(Input.Keys.W)) {
+      sprite.y += 300 * delta
+    }
+    if (Gdx.input.isKeyPressed(Input.Keys.A)) {
+      sprite.x -= 300 * delta
+    }
+    if (Gdx.input.isKeyPressed(Input.Keys.S)) {
+      sprite.y -= 300 * delta
+    }
+    if (Gdx.input.isKeyPressed(Input.Keys.D)) {
+      sprite.x += 300 * delta
+    }
+  }
+}

assets/test.groovy

@@ -0,0 +1,36 @@
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.Input
+import com.badlogic.gdx.graphics.Texture
+import com.badlogic.gdx.graphics.g2d.Sprite
+import groovy.transform.Field
+import me.stringfromjava.funkin.Funkin
+import me.stringfromjava.funkin.backend.system.Paths
+
+@Field int count = 0
+
+count++
+
+println(count)
+
+var newSprite = new Sprite(new Texture(Paths.shared("images/transitionSwag/stickers-set-1/bfSticker1.png")))
+Funkin.screen.add(newSprite)
+
+Funkin.Signals.postRender.add { params ->
+  var delta = Gdx.graphics.getDeltaTime()
+  if (Gdx.input.isKeyPressed(Input.Keys.W)) {
+    newSprite.y += 300 * delta
+  }
+  if (Gdx.input.isKeyPressed(Input.Keys.A)) {
+    newSprite.x -= 300 * delta
+  }
+  if (Gdx.input.isKeyPressed(Input.Keys.S)) {
+    newSprite.y -= 300 * delta
+  }
+  if (Gdx.input.isKeyPressed(Input.Keys.D)) {
+    newSprite.x += 300 * delta
+  }
+}
+
+Funkin.Signals.preGameClose.add { params ->
+  newSprite.getTexture().dispose()
+}

core/src/main/java/me/stringfromjava/funkin/Funkin.java

@@ -7,6 +7,7 @@
 import me.stringfromjava.funkin.backend.display.FunkinScreen;
 import me.stringfromjava.funkin.backend.system.FunkinSignal;
 import me.stringfromjava.funkin.backend.system.Paths;
+
 import java.util.HashMap;
 import java.util.Map;
 

core/src/main/java/me/stringfromjava/funkin/FunkinGame.java

@@ -2,8 +2,10 @@
 
 import com.badlogic.gdx.Game;
 import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Input;
 import com.badlogic.gdx.audio.Sound;
 import me.stringfromjava.funkin.game.InitScreen;
+import me.stringfromjava.funkin.syntrix.script.SyntrixScriptHandler;
 
 import java.util.Set;
 
@@ -19,6 +21,15 @@ public class FunkinGame extends Game {
 
   @Override
   public void create() {
+    SyntrixScriptHandler.compileScript("test.groovy");
+    SyntrixScriptHandler.executeScript("new_screen.groovy");
+
+    Funkin.Signals.postRender.add(data -> {
+      if (Gdx.input.isKeyJustPressed(Input.Keys.SPACE)) {
+        SyntrixScriptHandler.executeScript("test.groovy");
+      }
+    });
+
     setScreen(new InitScreen());
   }
 

core/src/main/java/me/stringfromjava/funkin/backend/display/FunkinScreen.java

@@ -10,6 +10,7 @@
 import com.badlogic.gdx.utils.viewport.FitViewport;
 import com.badlogic.gdx.utils.viewport.Viewport;
 import me.stringfromjava.funkin.util.Constants;
+
 import java.util.ArrayList;
 
 /**

core/src/main/java/me/stringfromjava/funkin/backend/system/FunkinSignal.java

@@ -1,20 +1,20 @@
 package me.stringfromjava.funkin.backend.system;
 
 import java.util.ArrayList;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
  * Utility class for creating objects that can execute multiple callbacks when it is dispatched (or
  * triggered).
  */
 public class FunkinSignal<T> {
 
-  private final ArrayList<SignalHandler<T>> callbacks;
-  private final ArrayList<SignalHandler<T>>
-      tempCallbacks; // Callbacks that are added with addOnce().
+  private final CopyOnWriteArrayList<SignalHandler<T>> callbacks;
+  private final CopyOnWriteArrayList<SignalHandler<T>> tempCallbacks; // Callbacks that are added with addOnce().
 
   public FunkinSignal() {
-    callbacks = new ArrayList<>();
-    tempCallbacks = new ArrayList<>();
+    callbacks = new CopyOnWriteArrayList<>();
+    tempCallbacks = new CopyOnWriteArrayList<>();
   }
 
   /**

core/src/main/java/me/stringfromjava/funkin/syntrix/script/SyntrixScriptHandler.java

@@ -0,0 +1,57 @@
+package me.stringfromjava.funkin.syntrix.script;
+
+import groovy.lang.GroovyShell;
+import groovy.lang.Script;
+import me.stringfromjava.funkin.backend.system.Paths;
+import org.codehaus.groovy.control.CompilationFailedException;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Core handler class for compiling and executing G-String scripts (aka {@code .groovy} scripts).
+ */
+public final class SyntrixScriptHandler {
+
+  // Key = the path of the script.
+  // Value = The script object itself.
+  private static Map<String, Script> compiledScripts = new HashMap<>();
+
+  public static Script executeScript(String path) {
+    try {
+      if (compiledScripts.containsKey(path)) {
+        Script script = compiledScripts.get(path);
+        script.run();
+        return script;
+      } else {
+        return compileScript(path, true);
+      }
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
+    return null;
+  }
+
+  public static Script compileScript(String path) {
+    return compileScript(path, false);
+  }
+
+  public static Script compileScript(String path, boolean execute) {
+    try {
+      if (!compiledScripts.containsKey(path)) {
+        String code = Paths.asset(path).readString();
+        Script script = new GroovyShell().parse(code);
+        compiledScripts.put(path, script);
+        if (execute) {
+          script.run();
+        }
+        return script;
+      }
+    } catch (CompilationFailedException e) {
+      e.printStackTrace();
+    }
+    return null;
+  }
+
+  private SyntrixScriptHandler() {}
+}

core/src/main/java/me/stringfromjava/funkin/tween/FunkinTween.java

@@ -1,6 +1,7 @@
 package me.stringfromjava.funkin.tween;
 
 import me.stringfromjava.funkin.tween.settings.FunkinTweenSettings;
+
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 

core/src/main/java/me/stringfromjava/funkin/tween/settings/FunkinTweenSettings.java

@@ -2,6 +2,7 @@
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.stream.Collectors;