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bpo-40480 "fnmatch" exponential execution time #19908

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Merged
tim-one merged 5 commits into from
May 6, 2020
+71 −7
Merged

bpo-40480 "fnmatch" exponential execution time #19908

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b7c0e5e
bpo-40480 "fnmatch" exponential execution time
tim-one May 4, 2020
a158f62
trivial edits
tim-one May 4, 2020
1d61b7f
📜🤖 Added by blurb_it.
blurb-it[bot] May 4, 2020
fbb7048
Moved the block of new translate() tests into the right
tim-one May 4, 2020
86d1d0d
Removed useless code from an earlier version.
tim-one May 4, 2020
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Removed useless code from an earlier version.
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@tim-one
tim-one committed May 4, 2020
commit 86d1d0d817168d54ecec08cffec3b9b5eb092982
5 changes: 1 addition & 4 deletions Lib/fnmatch.py
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Expand Up @@ -136,13 +136,10 @@ def translate(pat):
res = []
add = res.append
i, n = 0, len(inp)
# Fixed piece at the start?
fixed = []
# Fixed pieces at the start?
while i < n and inp[i] is not STAR:
add(inp[i])
i += 1
if fixed:
add("".join(fixed))
# Now deal with STAR fixed STAR fixed ...
# For an interior `STAR fixed` pairing, we want to do a minimal
# .*? match followed by `fixed`, with no possibility of backtracking.
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