20 lines
1000 B
Plaintext
20 lines
1000 B
Plaintext
(fun print_through (x) (let (_ (println x)) x))
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(fun is_pair? (x) (and (vector? x) (> (len x) 0)))
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(set! quasiquote (vau de (x)
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(cond (is_pair? x)
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(cond (and (symbol? (idx x 0)) (= (get-text (idx x 0)) "unquote"))
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(eval (idx x 1) de)
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true
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(cond (and (is_pair? (idx x 0)) (symbol? (idx (idx x 0) 0)) (= (get-text (idx (idx x 0) 0)) "splice-unquote"))
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(concat (eval (idx (idx x 0) 1) de) (apply quasiquote [(slice x 1 -1)] de))
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true
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(concat [(apply quasiquote [(idx x 0)] de)] (apply quasiquote [(slice x 1 -1)] de))))
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true x)))
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(add_grammar_rule 'form '("`" optional_WS form) (lambda (_ _ f) ['quasiquote f]))
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(add_grammar_rule 'form '("~" optional_WS form) (lambda (_ _ f) ['unquote f]))
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(add_grammar_rule 'form '("," optional_WS form) (lambda (_ _ f) ['splice-unquote f]))
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