Commit Graph

11 Commits

Author SHA1 Message Date
Serhiy Storchaka 573eff3e2e
Output more details in the re tracing (GH-111357) 2023-10-26 16:42:42 +03:00
Serhiy Storchaka e2b3d831fd
gh-109747: Improve errors for unsupported look-behind patterns (GH-109859)
Now re.error is raised instead of OverflowError or RuntimeError for
too large width of look-behind pattern.

The limit is increased to 2**32-1 (was 2**31-1).
2023-10-14 09:13:02 +03:00
Serhiy Storchaka 8ac2085b80
gh-109631: Allow interruption of short repeated regex matches (GH-109867)
Counting for signal checking now continues in new match from the point where
it ended in the previous match instead of starting from 0.
2023-09-26 10:56:33 +03:00
SKO abd9cc52d9
gh-100061: Proper fix of the bug in the matching of possessive quantifiers (GH-102612)
Restore the global Input Stream pointer after trying to match a sub-pattern.

Co-authored-by: Ma Lin <animalize@users.noreply.github.com>
2023-08-16 10:43:45 +03:00
Serhiy Storchaka b305c69d10
gh-106508: Improve debugging of the _sre module (GH-106509)
Now the VERBOSE macro can control tracing on per-pattern basis:

* 0 -- disabled
* 1 -- only if the DEBUG flag set
* 2 -- always
2023-07-08 18:00:39 +03:00
Gregory P. Smith 4beee0c7b0
gh-91404: Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or allocation failure (GH-32283) (#93882)
Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure (GH-32283)"

This reverts commit 6e3eee5c11.

Manual fixups to increase the MAGIC number and to handle conflicts with
a couple of changes that landed after that.

Thanks for reviews by Ma Lin and Serhiy Storchaka.
2022-06-17 01:19:44 -07:00
Serhiy Storchaka f703c96cf0
gh-91870: Remove unsupported SRE opcode CALL (GH-91872)
It was initially added to support atomic groups, but that
support was never fully implemented, and CALL was only left
in the compiler, but not interpreter and parser.

ATOMIC_GROUP is now used to support atomic groups.
2022-04-26 21:07:25 +03:00
Ma Lin e4e8895ae3
gh-91616: re module, fix .fullmatch() mismatch when using Atomic Grouping or Possessive Quantifiers (GH-91681)
These jumps should use DO_JUMP0() instead of DO_JUMP():
- JUMP_POSS_REPEAT_1
- JUMP_POSS_REPEAT_2
- JUMP_ATOMIC_GROUP
2022-04-19 17:49:36 +03:00
Ma Lin a29f858124
bpo-47256: Increasing the depth of backtracking in RE (GH-32411)
Limit the maximum capturing group to 2**30-1 on 64-bit platforms
(it was 2**31-1). No change on 32-bit platforms (2**28-1).

It allows to reduce the size of SRE(match_context):
- On 32 bit platform: 36 bytes, no change.  (msvc2022)
- On 64 bit platform: 72 bytes -> 56 bytes. (msvc2022/gcc9.4)

which leads to increasing the depth of backtracking.
2022-04-18 16:50:40 +03:00
Brandt Bucher 1b34b5687b
gh-91404: Use computed gotos and reduce indirection in re (#91495) 2022-04-15 09:26:44 -07:00
Serhiy Storchaka 1578f06c1c
bpo-47152: Move sources of the _sre module into a subdirectory (GH-32290) 2022-04-04 10:53:26 +03:00