30 lines
1 KiB
Fennel
30 lines
1 KiB
Fennel
; [q X] -> q(X)
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; [q :x] -> q(x)
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; [q #(+ 1 2)] -> q(3)
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(fn clause [c]
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(match c
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(where [:hashfn expr] (list? c)) `[:const ,expr]
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(where [name & params] (sequence? c)) `[:literal ,(tostring name) ,(icollect [_ param (ipairs params)] (clause param))]
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(where [head & args] (list? c) (sym? head)) (icollect [_ expr (ipairs args) :into [(tostring head)]] (clause expr))
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(where c (list? c)) (icollect [_ val (ipairs c)] (clause val))
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(where v (sym? c)) `[:var ,(tostring v)]
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_ `[:const ,c]))
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(fn clauses [...]
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(icollect [_ c (ipairs [...]) :into `(values)] (clause c)))
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(fn defrule [s ...] `(: ,s :defrule ,(clauses ...)))
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(fn defrules [s ...]
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(icollect [_ rule (ipairs [...]) :into `(do)]
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(defrule s (table.unpack rule))))
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(fn query [s ...] `(: ,s :query ,(clauses ...)))
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(fn insert [s ...] `(: ,s :insert ,(clauses ...)))
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(fn delete [s ...] `(: ,s :delete ,(clauses ...)))
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(fn update [s ...] `(: ,s :update ,(clauses ...)))
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{: clause : clauses :$ clauses : defrule : defrules : query : insert : delete : update}
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