2 Commits

Author	SHA1	Message	Date
giles	7ce723f732	datalog: built-ins + body arithmetic + order-aware safety (Phase 4, 106/106) ... New lib/datalog/builtins.sx: (< <= > >= = !=) and (is X expr) with + - * /. dl-eval-arith recursively evaluates nested compounds. Safety analysis now walks body left-to-right tracking the bound set: comparisons require all args bound, is RHS vars must be bound (LHS becomes bound), = special-cases the var/non-var combos. db.sx keeps the simple safety check as a forward-reference fallback; builtins.sx redefines dl-rule-check-safety to the comprehensive version. eval.sx dispatches built-ins through dl-eval-builtin instead of erroring. 19 new tests.	2026-05-07 23:51:21 +00:00
giles	9bc70fd2a9	datalog: db + naive eval + safety analysis (Phase 3, 87/87) ... db.sx: facts indexed by relation name, rules list, dl-add-fact! (rejects non-ground), dl-add-rule! (rejects unsafe — head vars not in positive body). eval.sx: dl-saturate! fixpoint, dl-query with deduped projected results. Negation and arithmetic raise clear errors (Phase 4/7 to follow). 15 eval tests: transitive closure, sibling, same-gen, grandparent, cyclic reach, safety.	2026-05-07 23:41:27 +00:00