Jinja - support rejectattr

[giladgd]

I've added support for rejectattr in Jinja since I encountered some GGUF models that include a chat template that uses it, like this one for example.

[xenova]

Thanks for the PR! 🎉

Since rejectattr is very similar to selectattr, maybe we can remove code redundancy by reusing the logic?

Something like:

case "selectattr": 
case "rejectattr": 
{
const select = filterName === "selectattr";

// ... same logic

// Filter the array using the test function
const filtered = (operand.value as ObjectValue[]).filter((item) => {
    const a = item.value.get(attr.value);
    const result = a ? testFunction(a, value) : false;
    return select ? result : !result;
});

}

the following should do the same (less readable though)

const filtered = (operand.value as ObjectValue[]).filter(item => {
    const a = item.value.get(attr.value);
    return select === !!(a && testFunction(a, value));
});

[giladgd]

I've made the changes, and the tests seem to pass 👍🏻

[xenova]

A perfect PR! Thanks a ton! ✅

Will put out a new release shortly too (just needing to finish one more thing)

[julien-c]

thanks for the contrib, @giladgd!