Using a function as a parameter for a custom function causes ArrayIndexOutOfBoundsException

Creating a custom function that accepts a function causes a java.lang.ArrayIndexOutOfBoundsException

Example Script

function test(callback as function(int)bool)
{
    if(callback(3))
    {
        print("callback success");
    }
}
//Note: The below is unnecessary but provided for completeness
test(function(a as int) as bool
{
    print("value was " ~ a);
    return true;
} as function(int)bool);

Exception in crafttweaker.log

[INITIALIZATION][CLIENT][ERROR] [crafttweaker]: Error executing {[0:crafttweaker]: testFunction.zs}: 69
java.lang.ArrayIndexOutOfBoundsException: 69
	at org.objectweb.asm.Type.getArgumentTypes(Unknown Source)
	at org.objectweb.asm.commons.LocalVariablesSorter.<init>(Unknown Source)
	at org.objectweb.asm.commons.LocalVariablesSorter.<init>(Unknown Source)
	at stanhebben.zenscript.util.MethodOutput.<init>(MethodOutput.java:26)
	at stanhebben.zenscript.ZenModule.compileScripts(ZenModule.java:114)
	at crafttweaker.runtime.CrTTweaker.loadScript(CrTTweaker.java:211)
	at crafttweaker.runtime.CrTTweaker.loadScript(CrTTweaker.java:101)
	at crafttweaker.mc1120.events.CommonEventHandler.registerRecipes(CommonEventHandler.java:69)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_818_CommonEventHandler_registerRecipes_Register.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
	at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:814)
	at net.minecraftforge.common.crafting.CraftingHelper.loadRecipes(CraftingHelper.java:624)
	at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:742)
	at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:336)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:535)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:3931)
	at net.minecraft.client.main.Main.main(SourceFile:123)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

CraftTweaker version: CraftTweaker2-1.12-4.1.15

ZS does not allow for functions as parameters because internally it uses different types.
This would only be possible if you were to use a function that is registered to ZS as a functional Interface (e.g. IItemCondition)

Short of forking CT, can we register a functional interface using ZenClasses?

Take this example (the 2nd function parameter for recipes)

https://github.com/CraftTweaker/CraftTweaker/blob/1.12/CraftTweaker2-API/src/main/java/crafttweaker/api/recipes/IRecipeAction.java

So it's like using lambda needs an interface?
If we are allowed to define interfaces or function signatures, it seems this is possible.

You can use lambdas when you have registered a functional interface using Java Code.
You cannot create functional interfaces from within ZS, but you can implement them (that is what a lambda is)

Hey there,

I apologize for the late reply.
Currently I have a rudimentary implementation for function types as parameters and members in my local dev environment.

var myTestFun as function(string)void = function(s as string) as void {print(s);};
myTestFun('Hello World');

function myAcceptFun(consumer as function(string)void) as void {
   consumer('hello from inside myAcceptFun');
}

myAcceptFun(myTestFun);
myAcceptFun(function(s as string) as void {print('Another thing: ' ~ s);});

Would print

Hello World
hello from inside myAcceptFun
Another thing: hello from inside myAcceptFun

And

zenClass myClass {
    var consumer as function(string)void;
    zenConstructor(consumer as function(string)void) {
        this.consumer = consumer;
    }
    function acceptString(x as string) as void {
        consumer(x);
    }
}
myClass(function(x as string) as void {print('inside fun: ' ~ x);}).acceptString('abc');

Would print

inside fun: abc

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Using a function as a parameter for a custom function causes ArrayIndexOutOfBoundsException #26

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Using a function as a parameter for a custom function causes ArrayIndexOutOfBoundsException #26

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kindlich commented on Mar 13, 2019

ErzengelLichtes commented on Mar 15, 2019

kindlich commented on Mar 15, 2019

hnOsmium0001 commented on May 1, 2019

kindlich commented on May 1, 2019

kindlich commented on May 26, 2020

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