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;; package xyz (defun rr/prop-access (ast parse-fn) (unless (symbolp (cadr ast)) (error "invalid - property access (@ ...) form *must* start with a symbol")) (let ((xyz (reduce (lambda (acc e) (if (symbolp e) (cons e acc) (list `(prop-get ,(cons 'prop (reverse acc)) ,(funcall parse-fn e))))) (cdr ast) :initial-value '()))) (if (eq (car xyz) 'prop-get) xyz `(prop ,@(reverse xyz))))) ;; only for reference (defun rewrite-ast (ast ruleset) "parse AST, applying rewrite ruleset" (labels ((rewrite-ast* (ast) (cond ((atom ast) ast) ((symbolp (car ast)) (let ((rewrite-rule (getf ruleset (car ast)))) (if rewrite-rule (funcall rewrite-rule ast #'rewrite-ast*) (mapcar #'rewrite-ast* ast)))) (t (mapcar #'rewrite-ast* ast))))) (rewrite-ast* ast))) ;; from another package, xyz/tests, I get: ;; (xyz::prop ...) ;; from (rewrite-ast '(@ foo bar) '(@ rr/prop-access)) ;; => (XYZ::PROP FOO BAR)