Mercurial > public > mercurial-scm > hg-stable
comparison mercurial/util.py @ 6074:59a9dc9562e2
ignore: split up huge patterns
Some versions of Python silently mishandle large regexes, so split
them up at a conservative 20k.
| author | Matt Mackall <mpm@selenic.com> |
|---|---|
| date | Mon, 11 Feb 2008 16:13:43 -0600 |
| parents | 3c3b126e5619 |
| children | 41aa0a37d9be |
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| 6073:89c70d496175 | 6074:59a9dc9562e2 |
|---|---|
| 457 """build a matching function from a set of patterns""" | 457 """build a matching function from a set of patterns""" |
| 458 if not pats: | 458 if not pats: |
| 459 return | 459 return |
| 460 try: | 460 try: |
| 461 pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats]) | 461 pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats]) |
| 462 if len(pat) > 20000: | |
| 463 raise OverflowError() | |
| 462 return re.compile(pat).match | 464 return re.compile(pat).match |
| 463 except OverflowError: | 465 except OverflowError: |
| 464 # We're using a Python with a tiny regex engine and we | 466 # We're using a Python with a tiny regex engine and we |
| 465 # made it explode, so we'll divide the pattern list in two | 467 # made it explode, so we'll divide the pattern list in two |
| 466 # until it works | 468 # until it works |