8000 bpo-433030: Add support of atomic grouping in regular expressions by serhiy-storchaka · Pull Request #31982 · python/cpython · GitHub
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bpo-433030: Add support of atomic grouping in regular expressions #31982

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Merged
merged 9 commits into from
Mar 21, 2022
+593 −92
Merged

bpo-433030: Add support of atomic grouping in regular expressions #31982

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a4f8ac0
bpo-433030: Add support of atomic grouping in regular expressions
serhiy-storchaka Mar 18, 2022
5066bd1
Polishing.
serhiy-storchaka Mar 19, 2022
8015968
Update documentation.
serhiy-storchaka Mar 19, 2022
599109c
Fix incorrect use of the term role.
serhiy-storchaka Mar 19, 2022
711975d
Polishing.
serhiy-storchaka Mar 20, 2022
1ff76c3
Merge branch 'main' into re-atomic-groups
serhiy-storchaka Mar 20, 2022
9d54059
Simplify the compliler code.
serhiy-storchaka Mar 20, 2022
7e4f64a
Fix possesive repetition of 1-character pattern
serhiy-storchaka Mar 21, 2022
b9e20f0
Add the original author in Misc/ACKS.
serhiy-storchaka Mar 21, 2022
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Simplify the compliler code.
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@serhiy-storchaka
serhiy-storchaka committed Mar 20, 2022
commit 9d540594481838da577c466405f89ddf3314c84a
26 changes: 9 additions & 17 deletions Lib/sre_compile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,16 @@
assert _sre.MAGIC == MAGIC, "SRE module mismatch"

_LITERAL_CODES = {LITERAL, NOT_LITERAL}
_REPEATING_CODES = {MIN_REPEAT, MAX_REPEAT, POSSESSIVE_REPEAT}
_SUCCESS_CODES = {SUCCESS, FAILURE}
_ASSERT_CODES = {ASSERT, ASSERT_NOT}
_UNIT_CODES = _LITERAL_CODES | {ANY, IN}

_REPEATING_CODES = {
MIN_REPEAT: (REPEAT, MIN_UNTIL, MIN_REPEAT_ONE),
MAX_REPEAT: (REPEAT, MAX_UNTIL, REPEAT_ONE),
POSSESSIVE_REPEAT: (POSSESSIVE_REPEAT, SUCCESS, POSSESSIVE_REPEAT_ONE),
}

# Sets of lowercase characters which have the same uppercase.
_equivalences = (
# LATIN SMALL LETTER I, LATIN SMALL LETTER DOTLESS I
Expand Down Expand Up @@ -138,34 +143,21 @@ def _compile(code, pattern, flags):
if flags & SRE_FLAG_TEMPLATE:
raise error("internal: unsupported template operator %r" % (op,))
if _simple(av[2]):
if op is MAX_REPEAT:
emit(REPEAT_ONE)
elif op is POSSESSIVE_REPEAT:
emit(POSSESSIVE_REPEAT_ONE)
else:
emit(MIN_REPEAT_ONE)
emit(REPEATING_CODES[op][2])
skip = _len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
emit(SUCCESS)
code[skip] = _len(code) - skip
else:
if op is POSSESSIVE_REPEAT:
emit(POSSESSIVE_REPEAT)
else:
emit(REPEAT)
emit(REPEATING_CODES[op][0])
skip = _len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
code[skip] = _len(code) - skip
if op is POSSESSIVE_REPEAT:
emit(SUCCESS)
elif op is MAX_REPEAT:
emit(MAX_UNTIL)
else:
emit(MIN_UNTIL)
emit(REPEATING_CODES[op][1])
elif op is SUBPATTERN:
group, add_flags, del_flags, p = av
if group:
Expand Down
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