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When annotating regexp states with the leftmost longest match,

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prefer the leftmost even if the end of either match has not
yet been completed.  If two matches start on the same state,
prefer an uncompleted end to a completed one.
Fixes issue #229.
This commit is contained in:
Alex Shinn 2014-07-10 22:59:12 +09:00
parent 8b39d35dc1
commit 53c7dfd71e
2 changed files with 12 additions and 6 deletions
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13
lib/chibi/regexp.scm
View file

@ -267,15 +267,16 @@
(regexp-match-ref m2 (+ i 1))))
(lp (+ i 2)))
((and (string-cursor? (regexp-match-ref m2 i))
(string-cursor? (regexp-match-ref m2 (+ i 1)))
(or (not (string-cursor? (regexp-match-ref m1 i)))
(not (string-cursor? (regexp-match-ref m1 (+ i 1))))
(string-cursor<? (regexp-match-ref m2 i)
(regexp-match-ref m1 i))
(and (string-cursor=? (regexp-match-ref m2 i)
(regexp-match-ref m1 i))
(string-cursor>? (regexp-match-ref m2 (+ i 1))
(regexp-match-ref m1 (+ i 1))))))
(and
(string-cursor=? (regexp-match-ref m2 i)
(regexp-match-ref m1 i))
(or (not (string-cursor? (regexp-match-ref m2 (+ i 1))))
(and (string-cursor? (regexp-match-ref m1 (+ i 1)))
(string-cursor>? (regexp-match-ref m2 (+ i 1))
(regexp-match-ref m1 (+ i 1))))))))
#f)
(else
#t)))))

5
tests/regexp-tests.scm
View file

@ -72,6 +72,11 @@
(regexp-matches '(or (-> foo "ab") (-> foo "cd")) "cd")
'foo))
;; non-deterministic case from issue #229
(let* ((elapsed '(: (** 1 2 num) ":" num num (? ":" num num)))
(span (rx ,elapsed "-" ,elapsed)))
(test-re-search '("1:45:02-2:06:13") span " 1:45:02-2:06:13 "))
(test-re '("ababc" "abab")
'(: bos ($ (* "ab")) "c")
"ababc")