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fixes #19104; peg Incorrect captures [backport:1.6] (#20352)

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* fixes #19104; peg Incorrect captures [backport:1.6]

* add tests

Co-authored-by: khchen <khchen@gmail.com>
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ringabout 2022-09-15 13:54:53 +08:00 • committed by GitHub
commit 2b80ff2374
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2 changed files with 8 additions and 1 deletions
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lib/pure/pegs.nim
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@ -838,10 +838,13 @@ template matchOrParse(mopProc: untyped) =
var idx = c.ml # reserve a slot for the subpattern
result = mopProc(s, p.sons[0], start, c)
if result >= 0:
inc(c.ml)
if idx < MaxSubpatterns:
if idx != c.ml:
for i in countdown(c.ml, idx):
c.matches[i+1] = c.matches[i]
c.matches[idx] = (start, start+result-1)
#else: silently ignore the capture
inc(c.ml)
leave(pkCapture, s, p, start, result)
of pkBackRef:
enter(pkBackRef, s, p, start)