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Code Issues 1 Releases Wiki Activity

Fix #971 - remove to rule optimization

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For to and thru, we need to restore eveytime through the loop since rules need
run with the right captures on the stack, especially if they have any
sort of backrefs.
This commit is contained in:
Calvin Rose 2022-04-29 19:15:56 -05:00
parent 427f7c362e
commit a895219d2f
2 changed files with 24 additions and 4 deletions
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6
src/core/peg.c
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@ -289,10 +289,8 @@ tail:
while (text <= s->text_end) {
CapState cs2 = cap_save(s);
next_text = peg_rule(s, rule_a, text);
if (next_text) {
if (rule[0] == RULE_TO) cap_load(s, cs2);
break;
}
if (next_text) break;
cap_load(s, cs2);
text++;
}
up1(s);

22
test/suite0011.janet
View File

@ -54,5 +54,27 @@
(for i 0 10
(assert (= i (os/execute [(dyn :executable) "-e" (string/format "(os/exit %d)" i)] :p)) (string "os/execute " i)))
# to/thru bug
(def pattern
(peg/compile
'{:dd (sequence :d :d)
:sep (set "/-")
:date (sequence :dd :sep :dd)
:wsep (some (set " \t"))
:entry (group (sequence (capture :date) :wsep (capture :date)))
:main (some (thru :entry))}))
(def alt-pattern
(peg/compile
'{:dd (sequence :d :d)
:sep (set "/-")
:date (sequence :dd :sep :dd)
:wsep (some (set " \t"))
:entry (group (sequence (capture :date) :wsep (capture :date)))
:main (some (choice :entry 1))}))
(def text "1800-10-818-9-818 16/12\n17/12 19/12\n20/12 11/01")
(assert (deep= (peg/match pattern text) (peg/match alt-pattern text)) "to/thru bug #971")
(end-suite)