How to override TJS2 classes with the same name

[uyjulian]

It is possible to override a TJS2 class with the same name, but you must follow the following rules:

1. Use a unique identifier when declaring a class

Example of this wrong usage:

global.ClassToOverride_original = global.ClassToOverride;
class ClassToOverride extends global.ClassToOverride_original
{
}
	

When instantiating the class, this will cause a segmentation fault.

2. Do not use an identifier that has been deleted

Example of this wrong usage:

global.ClassToOverride_original = global.ClassToOverride;
delete global.ClassToOverride;
class ClassToOverride extends global.ClassToOverride_original
{
}
	

This will cause Member does not exist exception.

3. Place the original class name as the constructor

With these three rules, we can override a TJS2 class while keeping the same name.

global.ClassToOverride_uniqueidentifier_original = ClassToOverride;
class ClassToOverride_uniqueidentifier_override extends ClassToOverride_uniqueidentifier_original
{
    function ClassToOverride_uniqueidentifier_override()
    {
        super.ClassToOverride(...);
    }
	 function ClassToOverride()
    {
        ClassToOverride_uniqueidentifier_override(...);
    }
}
global.ClassToOverride = ClassToOverride_uniqueidentifier_override;
	

This is a cleaner way of adding features like word wrapping or line breaking to KAG, compared to some code I've seen.

Edited March 4, 2020 by uyjulian