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Possible fix for #143 #146

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Possible fix for #143 #146

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Possible fix for #143
Gleefre Oct 18, 2023
1f4c0c4
Create macrolet only when WITH-CLAUSE is "at toplevel" (not inside an…
Gleefre Oct 18, 2023
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11 changes: 9 additions & 2 deletions level1/impl.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@
(lambda (clause last?)
(ematch0 clause
((list* pattern body)
((lambda (x) (if last? x `(block clause ,x)))
((lambda (x) (if last? x `(with-clause ,x)))
;; << (return-from clause) = go to next clause
;; the last pattern does not have this block, allowing a direct jump to the upper block
(match-clause arg
Expand All @@ -77,9 +77,16 @@
((cons it rest)
(cons (funcall fn it nil) (mapcar1-with-last fn rest)))))

(defmacro with-clause (&body body)
`(block clause
(macrolet ((skip () `(next))
(with-clause (&body body)
`(block clause ,@body)))
,@body)))

(defmacro next () `(return-from clause nil))
(defmacro fail () `(next))
(defmacro skip () `(next))
(defmacro skip () `())

;;;; catch-based `next' implementation
;; using catch is not appropriate for our purpose, according to CLHS,
Expand Down