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2021-06-30Add support for builtins, and implement true/0, fail/0, call/1, and !/0 builtinsPeter Mikkelsen
2021-06-30Give queries another id than clauses, so variable names doesn't clashPeter Mikkelsen
2021-06-30Add a basic replPeter Mikkelsen
2021-06-30Treat the variable _ differently, in that it doesn't introduce a new bindingPeter Mikkelsen
2021-06-30Add backtracking to the evaluator. This means we have to keep track of ↵Peter Mikkelsen
choicepoints which is implemented the easy but wasteful way for now. I have also added a number which is used to differentiate variables from different application of the clauses.
2021-06-30Start work on an evaluator. For now it knows how to unify but doesn't know ↵Peter Mikkelsen
how to handle builtin predicates or how to backtrack