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Implemented quasiquoting as a vau!

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Nathan Braswell
2020-08-28 00:38:16 -04:00
parent a5f15f70f8
commit 241b4ca3f4
2 changed files with 56 additions and 1 deletions
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quasi.kp Normal file
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(fun print_through (x) (let (_ (println x)) x))
(fun is_pair? (x) (and (vector? x) (> (len x) 0)))
(set! quasiquote (vau de (x)
(cond (is_pair? x)
(cond (and (symbol? (idx x 0)) (= (get-text (idx x 0)) "unquote"))
(eval (idx x 1) de)
true
(cond (and (is_pair? (idx x 0)) (symbol? (idx (idx x 0) 0)) (= (get-text (idx (idx x 0) 0)) "splice-unquote"))
(concat (eval (idx (idx x 0) 1) de) (apply quasiquote [(slice x 1 -1)] de))
true
(concat [(apply quasiquote [(idx x 0)] de)] (apply quasiquote [(slice x 1 -1)] de))))
true x)))
(add_grammar_rule 'form '("`" optional_WS form) (lambda (_ _ f) ['quasiquote f]))
(add_grammar_rule 'form '("~" optional_WS form) (lambda (_ _ f) ['unquote f]))
(add_grammar_rule 'form '("," optional_WS form) (lambda (_ _ f) ['splice-unquote f]))