feat: EmptyArrayLengthTransformer

[SpigotRCE]

before:

after:

[Animowany]

I would refactor this code for more flow-safety and also for V2 codebase.
That would be my proposal for that transformer.

public class EmptyArrayLengthTransformer extends Transformer {
  @Override
  protected void transform() throws Exception {
    scopedClasses().forEach(classWrapper -> classWrapper.methods().forEach(methodNode -> {
      MethodContext methodContext = MethodContext.of(classWrapper, methodNode);
      OpcodeMatch.of(ARRAYLENGTH).and(
            FrameMatch.stack(0, OpcodeMatch.of(NEWARRAY).and(
                FrameMatch.stack(0, NumberMatch.numInteger().capture("array-length"))
            )
        )
      ).findAllMatches(methodContext).forEach(matchContext -> {
        methodNode.instructions.insert(matchContext.insn(), numberInsn(matchContext.captures().get("array-length").insn().asInteger()));
        matchContext.removeAll();
      });
    }));
  }
}

[SpigotRCE]

thnx man