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Report attributes (:attrs) project to attr(Id, name) facts; policy gains (:attr x) and (:not <cond>) conditions. The Prolog substrate exposes negation as a functor not(Goal) (the prefix \+ operator doesn't parse here). Closed-world example: hide spam unless author verified. Default policy untouched — feature proven via custom rule sets, so all 132 base tests stay green. +14 extension tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
101 lines
3.0 KiB
Plaintext
101 lines
3.0 KiB
Plaintext
;; lib/mod/policy.sx — moderation rules → Prolog clauses.
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;;
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;; A rule is {:name :action :when}. :when is a list of condition forms; each
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;; compiles to a Prolog goal. Rule order is precedence: the engine queries with
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;; pl-query-one, so the first clause that proves wins. The final default rule has
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;; an empty body (true) so every report yields at least :keep — "no rule matched"
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;; is a real result, not a query failure.
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;;
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;; cond->goal takes an id-term so the same condition can be compiled with the
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;; head variable "Id" (for clause bodies) or a concrete report id (for proof-tree
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;; goal-by-goal re-querying in the engine).
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;;
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;; Precedence (top wins): exoneration evidence (appeal override) > confirmed-abuse
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;; evidence (human review) > spam/abuse classification > repeated-report count >
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;; default keep.
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(define mod/mk-rule (fn (name action conds) {:when conds :name name :action action}))
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(define mod/rule-name (fn (r) (get r :name)))
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(define mod/rule-action (fn (r) (get r :action)))
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(define mod/rule-when (fn (r) (get r :when)))
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(define
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mod/default-rules
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(list
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(mod/mk-rule
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"exonerated-keep"
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:keep (list (list :evidence "exonerated")))
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(mod/mk-rule
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"reviewer-remove"
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:remove (list (list :evidence "confirmed-abuse")))
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(mod/mk-rule "spam-hide" :hide (list (list :classification "spam")))
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(mod/mk-rule
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"abuse-remove"
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:remove (list (list :classification "abuse")))
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(mod/mk-rule
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"repeated-escalate"
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:escalate (list (list :count-at-least 3)))
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(mod/mk-rule "default-keep" :keep (list))))
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;; ── condition → Prolog goal ──
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;;
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;; (:classification "spam") → classification(Id, spam)
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;; (:evidence "kind") → evidence(Id, 'kind', _)
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;; (:attr "verified") → attr(Id, verified)
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;; (:not <cond>) → not(<cond>) (negation as failure)
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;; (:count-at-least 3) → report(Id, B, S), report_count(S, N), N >= 3
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(define
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mod/cond->goal
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(fn
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(c idterm)
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(let
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((tag (first c)))
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(cond
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((= tag :classification)
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(str "classification(" idterm ", " (nth c 1) ")"))
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((= tag :evidence)
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(str
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"evidence("
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idterm
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", "
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(mod/pl-quote (nth c 1))
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", _)"))
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((= tag :attr) (str "attr(" idterm ", " (nth c 1) ")"))
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((= tag :not)
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(str "not(" (mod/cond->goal (nth c 1) idterm) ")"))
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((= tag :count-at-least)
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(str
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"report("
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idterm
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", B, S), report_count(S, N), N >= "
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(nth c 1)))
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(true "true")))))
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(define
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mod/conds->body
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(fn
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(conds idterm)
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(if
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(empty? conds)
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"true"
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(mod/join-with ", " (map (fn (c) (mod/cond->goal c idterm)) conds)))))
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(define
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mod/rule->clause
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(fn
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(r)
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(str
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"policy_action(Id, "
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(mod/rule-action r)
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", '"
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(mod/rule-name r)
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"') :- "
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(mod/conds->body (mod/rule-when r) "Id")
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".")))
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(define
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mod/rules->program
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(fn (rules) (mod/join-with "\n" (map mod/rule->clause rules))))
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