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fixing combinatorial explosion of code in certain match or patterns

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This commit is contained in:
Alex Shinn 2012-05-23 23:21:35 +09:00
parent c4bf82842c
commit cb6d16a8f1
1 changed files with 3 additions and 1 deletions
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4
lib/chibi/match/match.scm
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@ -210,6 +210,7 @@
;; performance can be found at
;; http://synthcode.com/scheme/match-cond-expand.scm
;;
;; 2012/05/23 - fixing combinatorial explosion of code in certain or patterns
;; 2011/09/25 - fixing bug when directly matching an identifier repeated in
;; the pattern (thanks to Stefan Israelsson Tampe)
;; 2011/01/27 - fixing bug when matching tail patterns against improper lists
@ -479,7 +480,8 @@
(match-one v p . x))
((_ v (p . q) g+s sk fk i)
;; match one and try the remaining on failure
(match-one v p g+s sk (match-gen-or-step v q g+s sk fk i) i))
(let ((fk2 (lambda () (match-gen-or-step v q g+s sk fk i))))
(match-one v p g+s sk (fk2) i)))
))
;; We match a pattern (p ...) by matching the pattern p in a loop on