[LOGIC-44] ex* could expand macros in patterns

Sun, 17 Mar 2013 19:05:17 -0500

So, tagged data structures are probably interesting in a relational context. Say you have a relation with some default logic about dogs:

(defna friendlyo [Dog-Or-Breed]
    ([:Spot] succeed)
    ([:Spike] fail)
    ([Other-Dog] (fresh [Breed] (dog-breed Other-Dog Breed) (friendlyo Breed)))
    ([(breed :miniature-dachshund)] fail)
    ([(breed :golden-retriever)] succeed)
    ;. . .)

Assume there's a (defmacro breed [t] `[:breed ~t]).

That's nicer than having to drop [:breed :golden-retriever] in there or whatever, since it's compile-time-checkable, less error-prone, reduces duplication, etc.

This little patch makes ex* expand macros in patterns so it doesn't treat e.g. (breed :golden-retriever) as introducing a new LVar called "breed". Test also provided.

[LOGIC-35] Core.logic equivalent of multimethods

Fri, 28 Dec 2012 00:48:09 -0600

I need to define predicates to which I can later (and from other namespaces) attach further clauses (so not just facts). I couldn't find any such functionality in the source. Due to the extensive use of macros, hacking such a system onto core.logic from the outside is extremely difficult, if not impossible (to me at least).

I'd love to implement this myself too, if given an OK and rough direction.

Clojure JIRA

[LOGIC-44] ex* could expand macros in patterns

[LOGIC-35] Core.logic equivalent of multimethods