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Add PMap (partial-map) record that unifies with maps whose keys are a…
… superset of its keys.
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([_ [y . ys] [y . zs]] | ||
(!= y x) | ||
(rembero x ys zs))) | ||
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(load "logic/partial_map") |
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;;This file defines a PMap (partial map) record that unifies with maps without having all of that map's keys. | ||
(in-ns 'clojure.core.logic) | ||
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(defprotocol IUnifyWithPMap | ||
(unify-with-pmap [pmap u s])) | ||
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(defrecord PMap [] | ||
IUnifyWithMap | ||
(unify-with-map [v u s] | ||
(loop [ks (keys v) s s] | ||
(if (seq ks) | ||
(let [kf (first ks) | ||
uf (get u kf ::not-found)] | ||
(if (= uf ::not-found) | ||
nil | ||
(if-let [s (unify s (get v kf) uf)] | ||
(recur (next ks) s) | ||
nil))) | ||
s))) | ||
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IUnifyWithPMap | ||
(unify-with-pmap [v u s] | ||
(unify-with-map v u s)) | ||
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IUnifyTerms | ||
(unify-terms [u v s] | ||
(unify-with-pmap v u s)) | ||
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IUnifyWithLVar | ||
(unify-with-lvar [v u s] | ||
(ext-no-check s u v))) | ||
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(extend-protocol IUnifyWithPMap | ||
nil | ||
(unify-with-pmap [v u s] nil) | ||
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Object | ||
(unify-with-pmap [v u s] nil) | ||
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clojure.core.logic.LVar | ||
(unify-with-pmap [v u s] | ||
(ext s v u)) | ||
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clojure.lang.IPersistentMap | ||
(unify-with-pmap [v u s] | ||
(unify-with-map u v s))) | ||
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(defn partial-map | ||
"Given map m, returns partial map that unifies with maps even if it doesn't share all of the keys of that map. | ||
Only the keys of the partial map will be unified: | ||
(run* [q] | ||
(fresh [pm x] | ||
(== pm (partial-map {:a x})) | ||
(== pm {:a 1 :b 2}) | ||
(== pm q))) | ||
;;=> ({:a 1})" | ||
[m] | ||
(map->PMap m)) |
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