Gompl, a very simple scripting language written in GDScript

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Basically what the title says. I needed a simple way to execute game logic via our game’s dialogues and thought creating an interpreter could be fun. It don’t need it to be performant so I just used GDScript for the parser, and the amount of features is small, e.g., there are function calls, but not functions.

A script in Gompl could look like this:

x = 0 // initialise variable, otherwise it's "undefined"
while x < 10 do
    some_func(x) // "some_func" is defined in GDScript
    x = x + 1
end
if some_other_func("test") != 100 then // "some_other_func" also in GDScript defined
   "success"
else
   "fail"
end
// the last expression (either "success" or "fail" in this case)
// is returned by Gompl's eval() method

If this is interesting to some, here’s the code:

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I updated the language a bit, for example if-then expressions can now have elifs. There are some thing I’d still like to change, e.g. removing bools and adding floats for numbers.

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I decided against removing bools (as they’re needed for calling GDScript methods), but added floats now.

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4

Still struggling with the use-case for this… unless you want to build some Chaos-o-Matic 3000 gamestate machine… :sunglasses:

Wondering where this is going… :metal:

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Dunno, what’s not clear about the second sentence in my first post?

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I improved the error messages (they show line numbers now), and also made Gompl interruptible. Either provide a maximum amount of execution steps, or use the interrupt keyword, or both.

7

I added functions, so now you can write something like this in Gompl:

// it doesn't matter where the function is defined
function sum() // parameters are not (yet?) supported
	a + b // the last expression is the return value
end

a = 4
b = 8
c = sum() + sum() // c is 24

I added functions mostly because SmallBasic had them too, the language I really liked to use in Unity.

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