mirror of
https://github.com/python/cpython.git
synced 2024-11-24 10:24:35 +08:00
4beee0c7b0
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.
764 lines
25 KiB
Python
764 lines
25 KiB
Python
#
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# Secret Labs' Regular Expression Engine
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#
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# convert template to internal format
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#
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# Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
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#
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# See the __init__.py file for information on usage and redistribution.
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#
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"""Internal support module for sre"""
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import _sre
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from . import _parser
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from ._constants import *
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from ._casefix import _EXTRA_CASES
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assert _sre.MAGIC == MAGIC, "SRE module mismatch"
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_LITERAL_CODES = {LITERAL, NOT_LITERAL}
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_SUCCESS_CODES = {SUCCESS, FAILURE}
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_ASSERT_CODES = {ASSERT, ASSERT_NOT}
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_UNIT_CODES = _LITERAL_CODES | {ANY, IN}
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_REPEATING_CODES = {
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MIN_REPEAT: (REPEAT, MIN_UNTIL, MIN_REPEAT_ONE),
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MAX_REPEAT: (REPEAT, MAX_UNTIL, REPEAT_ONE),
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POSSESSIVE_REPEAT: (POSSESSIVE_REPEAT, SUCCESS, POSSESSIVE_REPEAT_ONE),
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}
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def _combine_flags(flags, add_flags, del_flags,
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TYPE_FLAGS=_parser.TYPE_FLAGS):
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if add_flags & TYPE_FLAGS:
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flags &= ~TYPE_FLAGS
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return (flags | add_flags) & ~del_flags
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def _compile(code, pattern, flags):
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# internal: compile a (sub)pattern
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emit = code.append
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_len = len
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LITERAL_CODES = _LITERAL_CODES
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REPEATING_CODES = _REPEATING_CODES
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SUCCESS_CODES = _SUCCESS_CODES
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ASSERT_CODES = _ASSERT_CODES
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iscased = None
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tolower = None
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fixes = None
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if flags & SRE_FLAG_IGNORECASE and not flags & SRE_FLAG_LOCALE:
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if flags & SRE_FLAG_UNICODE:
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iscased = _sre.unicode_iscased
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tolower = _sre.unicode_tolower
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fixes = _EXTRA_CASES
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else:
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iscased = _sre.ascii_iscased
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tolower = _sre.ascii_tolower
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for op, av in pattern:
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if op in LITERAL_CODES:
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if not flags & SRE_FLAG_IGNORECASE:
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emit(op)
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emit(av)
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elif flags & SRE_FLAG_LOCALE:
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emit(OP_LOCALE_IGNORE[op])
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emit(av)
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elif not iscased(av):
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emit(op)
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emit(av)
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else:
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lo = tolower(av)
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if not fixes: # ascii
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emit(OP_IGNORE[op])
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emit(lo)
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elif lo not in fixes:
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emit(OP_UNICODE_IGNORE[op])
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emit(lo)
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else:
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emit(IN_UNI_IGNORE)
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skip = _len(code); emit(0)
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if op is NOT_LITERAL:
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emit(NEGATE)
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for k in (lo,) + fixes[lo]:
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emit(LITERAL)
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emit(k)
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emit(FAILURE)
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code[skip] = _len(code) - skip
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elif op is IN:
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charset, hascased = _optimize_charset(av, iscased, tolower, fixes)
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if flags & SRE_FLAG_IGNORECASE and flags & SRE_FLAG_LOCALE:
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emit(IN_LOC_IGNORE)
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elif not hascased:
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emit(IN)
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elif not fixes: # ascii
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emit(IN_IGNORE)
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else:
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emit(IN_UNI_IGNORE)
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skip = _len(code); emit(0)
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_compile_charset(charset, flags, code)
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code[skip] = _len(code) - skip
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elif op is ANY:
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if flags & SRE_FLAG_DOTALL:
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emit(ANY_ALL)
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else:
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emit(ANY)
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elif op in REPEATING_CODES:
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if flags & SRE_FLAG_TEMPLATE:
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raise error("internal: unsupported template operator %r" % (op,))
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if _simple(av[2]):
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emit(REPEATING_CODES[op][2])
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skip = _len(code); emit(0)
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emit(av[0])
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emit(av[1])
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_compile(code, av[2], flags)
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emit(SUCCESS)
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code[skip] = _len(code) - skip
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else:
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emit(REPEATING_CODES[op][0])
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skip = _len(code); emit(0)
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emit(av[0])
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emit(av[1])
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_compile(code, av[2], flags)
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code[skip] = _len(code) - skip
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emit(REPEATING_CODES[op][1])
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elif op is SUBPATTERN:
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group, add_flags, del_flags, p = av
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if group:
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emit(MARK)
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emit((group-1)*2)
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# _compile_info(code, p, _combine_flags(flags, add_flags, del_flags))
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_compile(code, p, _combine_flags(flags, add_flags, del_flags))
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if group:
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emit(MARK)
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emit((group-1)*2+1)
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elif op is ATOMIC_GROUP:
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# Atomic Groups are handled by starting with an Atomic
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# Group op code, then putting in the atomic group pattern
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# and finally a success op code to tell any repeat
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# operations within the Atomic Group to stop eating and
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# pop their stack if they reach it
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emit(ATOMIC_GROUP)
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skip = _len(code); emit(0)
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_compile(code, av, flags)
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emit(SUCCESS)
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code[skip] = _len(code) - skip
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elif op in SUCCESS_CODES:
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emit(op)
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elif op in ASSERT_CODES:
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emit(op)
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skip = _len(code); emit(0)
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if av[0] >= 0:
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emit(0) # look ahead
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else:
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lo, hi = av[1].getwidth()
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if lo != hi:
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raise error("look-behind requires fixed-width pattern")
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emit(lo) # look behind
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_compile(code, av[1], flags)
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emit(SUCCESS)
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code[skip] = _len(code) - skip
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elif op is AT:
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emit(op)
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if flags & SRE_FLAG_MULTILINE:
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av = AT_MULTILINE.get(av, av)
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if flags & SRE_FLAG_LOCALE:
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av = AT_LOCALE.get(av, av)
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elif flags & SRE_FLAG_UNICODE:
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av = AT_UNICODE.get(av, av)
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emit(av)
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elif op is BRANCH:
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emit(op)
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tail = []
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tailappend = tail.append
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for av in av[1]:
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skip = _len(code); emit(0)
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# _compile_info(code, av, flags)
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_compile(code, av, flags)
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emit(JUMP)
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tailappend(_len(code)); emit(0)
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code[skip] = _len(code) - skip
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emit(FAILURE) # end of branch
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for tail in tail:
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code[tail] = _len(code) - tail
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elif op is CATEGORY:
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emit(op)
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if flags & SRE_FLAG_LOCALE:
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av = CH_LOCALE[av]
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elif flags & SRE_FLAG_UNICODE:
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av = CH_UNICODE[av]
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emit(av)
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elif op is GROUPREF:
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if not flags & SRE_FLAG_IGNORECASE:
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emit(op)
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elif flags & SRE_FLAG_LOCALE:
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emit(GROUPREF_LOC_IGNORE)
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elif not fixes: # ascii
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emit(GROUPREF_IGNORE)
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else:
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emit(GROUPREF_UNI_IGNORE)
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emit(av-1)
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elif op is GROUPREF_EXISTS:
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emit(op)
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emit(av[0]-1)
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skipyes = _len(code); emit(0)
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_compile(code, av[1], flags)
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if av[2]:
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emit(JUMP)
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skipno = _len(code); emit(0)
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code[skipyes] = _len(code) - skipyes + 1
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_compile(code, av[2], flags)
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code[skipno] = _len(code) - skipno
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else:
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code[skipyes] = _len(code) - skipyes + 1
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else:
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raise error("internal: unsupported operand type %r" % (op,))
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def _compile_charset(charset, flags, code):
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# compile charset subprogram
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emit = code.append
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for op, av in charset:
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emit(op)
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if op is NEGATE:
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pass
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elif op is LITERAL:
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emit(av)
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elif op is RANGE or op is RANGE_UNI_IGNORE:
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emit(av[0])
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emit(av[1])
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elif op is CHARSET:
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code.extend(av)
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elif op is BIGCHARSET:
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code.extend(av)
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elif op is CATEGORY:
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if flags & SRE_FLAG_LOCALE:
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emit(CH_LOCALE[av])
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elif flags & SRE_FLAG_UNICODE:
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emit(CH_UNICODE[av])
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else:
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emit(av)
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else:
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raise error("internal: unsupported set operator %r" % (op,))
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emit(FAILURE)
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def _optimize_charset(charset, iscased=None, fixup=None, fixes=None):
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# internal: optimize character set
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out = []
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tail = []
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charmap = bytearray(256)
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hascased = False
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for op, av in charset:
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while True:
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try:
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if op is LITERAL:
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if fixup:
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lo = fixup(av)
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charmap[lo] = 1
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if fixes and lo in fixes:
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for k in fixes[lo]:
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charmap[k] = 1
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if not hascased and iscased(av):
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hascased = True
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else:
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charmap[av] = 1
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elif op is RANGE:
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r = range(av[0], av[1]+1)
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if fixup:
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if fixes:
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for i in map(fixup, r):
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charmap[i] = 1
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if i in fixes:
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for k in fixes[i]:
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charmap[k] = 1
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else:
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for i in map(fixup, r):
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charmap[i] = 1
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if not hascased:
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hascased = any(map(iscased, r))
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else:
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for i in r:
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charmap[i] = 1
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elif op is NEGATE:
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out.append((op, av))
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else:
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tail.append((op, av))
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except IndexError:
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if len(charmap) == 256:
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# character set contains non-UCS1 character codes
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charmap += b'\0' * 0xff00
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continue
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# Character set contains non-BMP character codes.
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# For range, all BMP characters in the range are already
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# proceeded.
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if fixup:
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hascased = True
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# For now, IN_UNI_IGNORE+LITERAL and
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# IN_UNI_IGNORE+RANGE_UNI_IGNORE work for all non-BMP
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# characters, because two characters (at least one of
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# which is not in the BMP) match case-insensitively
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# if and only if:
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# 1) c1.lower() == c2.lower()
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# 2) c1.lower() == c2 or c1.lower().upper() == c2
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# Also, both c.lower() and c.lower().upper() are single
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# characters for every non-BMP character.
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if op is RANGE:
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op = RANGE_UNI_IGNORE
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tail.append((op, av))
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break
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# compress character map
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runs = []
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q = 0
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while True:
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p = charmap.find(1, q)
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if p < 0:
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break
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if len(runs) >= 2:
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runs = None
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break
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q = charmap.find(0, p)
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if q < 0:
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runs.append((p, len(charmap)))
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break
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runs.append((p, q))
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if runs is not None:
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# use literal/range
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for p, q in runs:
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if q - p == 1:
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out.append((LITERAL, p))
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else:
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out.append((RANGE, (p, q - 1)))
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out += tail
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# if the case was changed or new representation is more compact
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if hascased or len(out) < len(charset):
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return out, hascased
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# else original character set is good enough
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return charset, hascased
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# use bitmap
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if len(charmap) == 256:
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data = _mk_bitmap(charmap)
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out.append((CHARSET, data))
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out += tail
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return out, hascased
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# To represent a big charset, first a bitmap of all characters in the
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# set is constructed. Then, this bitmap is sliced into chunks of 256
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# characters, duplicate chunks are eliminated, and each chunk is
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# given a number. In the compiled expression, the charset is
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# represented by a 32-bit word sequence, consisting of one word for
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# the number of different chunks, a sequence of 256 bytes (64 words)
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# of chunk numbers indexed by their original chunk position, and a
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# sequence of 256-bit chunks (8 words each).
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# Compression is normally good: in a typical charset, large ranges of
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# Unicode will be either completely excluded (e.g. if only cyrillic
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# letters are to be matched), or completely included (e.g. if large
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# subranges of Kanji match). These ranges will be represented by
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# chunks of all one-bits or all zero-bits.
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# Matching can be also done efficiently: the more significant byte of
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# the Unicode character is an index into the chunk number, and the
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# less significant byte is a bit index in the chunk (just like the
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# CHARSET matching).
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charmap = bytes(charmap) # should be hashable
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comps = {}
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mapping = bytearray(256)
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block = 0
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data = bytearray()
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for i in range(0, 65536, 256):
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chunk = charmap[i: i + 256]
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if chunk in comps:
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mapping[i // 256] = comps[chunk]
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else:
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mapping[i // 256] = comps[chunk] = block
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block += 1
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data += chunk
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data = _mk_bitmap(data)
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data[0:0] = [block] + _bytes_to_codes(mapping)
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out.append((BIGCHARSET, data))
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out += tail
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return out, hascased
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_CODEBITS = _sre.CODESIZE * 8
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MAXCODE = (1 << _CODEBITS) - 1
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_BITS_TRANS = b'0' + b'1' * 255
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def _mk_bitmap(bits, _CODEBITS=_CODEBITS, _int=int):
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s = bits.translate(_BITS_TRANS)[::-1]
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return [_int(s[i - _CODEBITS: i], 2)
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for i in range(len(s), 0, -_CODEBITS)]
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def _bytes_to_codes(b):
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# Convert block indices to word array
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a = memoryview(b).cast('I')
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assert a.itemsize == _sre.CODESIZE
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assert len(a) * a.itemsize == len(b)
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return a.tolist()
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def _simple(p):
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# check if this subpattern is a "simple" operator
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if len(p) != 1:
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return False
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op, av = p[0]
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if op is SUBPATTERN:
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return av[0] is None and _simple(av[-1])
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return op in _UNIT_CODES
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def _generate_overlap_table(prefix):
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"""
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Generate an overlap table for the following prefix.
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An overlap table is a table of the same size as the prefix which
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informs about the potential self-overlap for each index in the prefix:
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- if overlap[i] == 0, prefix[i:] can't overlap prefix[0:...]
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- if overlap[i] == k with 0 < k <= i, prefix[i-k+1:i+1] overlaps with
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prefix[0:k]
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"""
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table = [0] * len(prefix)
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for i in range(1, len(prefix)):
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idx = table[i - 1]
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while prefix[i] != prefix[idx]:
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if idx == 0:
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table[i] = 0
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break
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idx = table[idx - 1]
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else:
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table[i] = idx + 1
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return table
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def _get_iscased(flags):
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if not flags & SRE_FLAG_IGNORECASE:
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return None
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elif flags & SRE_FLAG_UNICODE:
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return _sre.unicode_iscased
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else:
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return _sre.ascii_iscased
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def _get_literal_prefix(pattern, flags):
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# look for literal prefix
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prefix = []
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prefixappend = prefix.append
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prefix_skip = None
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iscased = _get_iscased(flags)
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for op, av in pattern.data:
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if op is LITERAL:
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if iscased and iscased(av):
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break
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prefixappend(av)
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elif op is SUBPATTERN:
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group, add_flags, del_flags, p = av
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flags1 = _combine_flags(flags, add_flags, del_flags)
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if flags1 & SRE_FLAG_IGNORECASE and flags1 & SRE_FLAG_LOCALE:
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break
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prefix1, prefix_skip1, got_all = _get_literal_prefix(p, flags1)
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if prefix_skip is None:
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if group is not None:
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prefix_skip = len(prefix)
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elif prefix_skip1 is not None:
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prefix_skip = len(prefix) + prefix_skip1
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prefix.extend(prefix1)
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if not got_all:
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break
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else:
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break
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else:
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return prefix, prefix_skip, True
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return prefix, prefix_skip, False
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|
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def _get_charset_prefix(pattern, flags):
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while True:
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if not pattern.data:
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return None
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op, av = pattern.data[0]
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if op is not SUBPATTERN:
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break
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group, add_flags, del_flags, pattern = av
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flags = _combine_flags(flags, add_flags, del_flags)
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if flags & SRE_FLAG_IGNORECASE and flags & SRE_FLAG_LOCALE:
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return None
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iscased = _get_iscased(flags)
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if op is LITERAL:
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if iscased and iscased(av):
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return None
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return [(op, av)]
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elif op is BRANCH:
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charset = []
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charsetappend = charset.append
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for p in av[1]:
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if not p:
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return None
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op, av = p[0]
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if op is LITERAL and not (iscased and iscased(av)):
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charsetappend((op, av))
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else:
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return None
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return charset
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elif op is IN:
|
|
charset = av
|
|
if iscased:
|
|
for op, av in charset:
|
|
if op is LITERAL:
|
|
if iscased(av):
|
|
return None
|
|
elif op is RANGE:
|
|
if av[1] > 0xffff:
|
|
return None
|
|
if any(map(iscased, range(av[0], av[1]+1))):
|
|
return None
|
|
return charset
|
|
return None
|
|
|
|
def _compile_info(code, pattern, flags):
|
|
# internal: compile an info block. in the current version,
|
|
# this contains min/max pattern width, and an optional literal
|
|
# prefix or a character map
|
|
lo, hi = pattern.getwidth()
|
|
if hi > MAXCODE:
|
|
hi = MAXCODE
|
|
if lo == 0:
|
|
code.extend([INFO, 4, 0, lo, hi])
|
|
return
|
|
# look for a literal prefix
|
|
prefix = []
|
|
prefix_skip = 0
|
|
charset = [] # not used
|
|
if not (flags & SRE_FLAG_IGNORECASE and flags & SRE_FLAG_LOCALE):
|
|
# look for literal prefix
|
|
prefix, prefix_skip, got_all = _get_literal_prefix(pattern, flags)
|
|
# if no prefix, look for charset prefix
|
|
if not prefix:
|
|
charset = _get_charset_prefix(pattern, flags)
|
|
## if prefix:
|
|
## print("*** PREFIX", prefix, prefix_skip)
|
|
## if charset:
|
|
## print("*** CHARSET", charset)
|
|
# add an info block
|
|
emit = code.append
|
|
emit(INFO)
|
|
skip = len(code); emit(0)
|
|
# literal flag
|
|
mask = 0
|
|
if prefix:
|
|
mask = SRE_INFO_PREFIX
|
|
if prefix_skip is None and got_all:
|
|
mask = mask | SRE_INFO_LITERAL
|
|
elif charset:
|
|
mask = mask | SRE_INFO_CHARSET
|
|
emit(mask)
|
|
# pattern length
|
|
if lo < MAXCODE:
|
|
emit(lo)
|
|
else:
|
|
emit(MAXCODE)
|
|
prefix = prefix[:MAXCODE]
|
|
emit(min(hi, MAXCODE))
|
|
# add literal prefix
|
|
if prefix:
|
|
emit(len(prefix)) # length
|
|
if prefix_skip is None:
|
|
prefix_skip = len(prefix)
|
|
emit(prefix_skip) # skip
|
|
code.extend(prefix)
|
|
# generate overlap table
|
|
code.extend(_generate_overlap_table(prefix))
|
|
elif charset:
|
|
charset, hascased = _optimize_charset(charset)
|
|
assert not hascased
|
|
_compile_charset(charset, flags, code)
|
|
code[skip] = len(code) - skip
|
|
|
|
def isstring(obj):
|
|
return isinstance(obj, (str, bytes))
|
|
|
|
def _code(p, flags):
|
|
|
|
flags = p.state.flags | flags
|
|
code = []
|
|
|
|
# compile info block
|
|
_compile_info(code, p, flags)
|
|
|
|
# compile the pattern
|
|
_compile(code, p.data, flags)
|
|
|
|
code.append(SUCCESS)
|
|
|
|
return code
|
|
|
|
def _hex_code(code):
|
|
return '[%s]' % ', '.join('%#0*x' % (_sre.CODESIZE*2+2, x) for x in code)
|
|
|
|
def dis(code):
|
|
import sys
|
|
|
|
labels = set()
|
|
level = 0
|
|
offset_width = len(str(len(code) - 1))
|
|
|
|
def dis_(start, end):
|
|
def print_(*args, to=None):
|
|
if to is not None:
|
|
labels.add(to)
|
|
args += ('(to %d)' % (to,),)
|
|
print('%*d%s ' % (offset_width, start, ':' if start in labels else '.'),
|
|
end=' '*(level-1))
|
|
print(*args)
|
|
|
|
def print_2(*args):
|
|
print(end=' '*(offset_width + 2*level))
|
|
print(*args)
|
|
|
|
nonlocal level
|
|
level += 1
|
|
i = start
|
|
while i < end:
|
|
start = i
|
|
op = code[i]
|
|
i += 1
|
|
op = OPCODES[op]
|
|
if op in (SUCCESS, FAILURE, ANY, ANY_ALL,
|
|
MAX_UNTIL, MIN_UNTIL, NEGATE):
|
|
print_(op)
|
|
elif op in (LITERAL, NOT_LITERAL,
|
|
LITERAL_IGNORE, NOT_LITERAL_IGNORE,
|
|
LITERAL_UNI_IGNORE, NOT_LITERAL_UNI_IGNORE,
|
|
LITERAL_LOC_IGNORE, NOT_LITERAL_LOC_IGNORE):
|
|
arg = code[i]
|
|
i += 1
|
|
print_(op, '%#02x (%r)' % (arg, chr(arg)))
|
|
elif op is AT:
|
|
arg = code[i]
|
|
i += 1
|
|
arg = str(ATCODES[arg])
|
|
assert arg[:3] == 'AT_'
|
|
print_(op, arg[3:])
|
|
elif op is CATEGORY:
|
|
arg = code[i]
|
|
i += 1
|
|
arg = str(CHCODES[arg])
|
|
assert arg[:9] == 'CATEGORY_'
|
|
print_(op, arg[9:])
|
|
elif op in (IN, IN_IGNORE, IN_UNI_IGNORE, IN_LOC_IGNORE):
|
|
skip = code[i]
|
|
print_(op, skip, to=i+skip)
|
|
dis_(i+1, i+skip)
|
|
i += skip
|
|
elif op in (RANGE, RANGE_UNI_IGNORE):
|
|
lo, hi = code[i: i+2]
|
|
i += 2
|
|
print_(op, '%#02x %#02x (%r-%r)' % (lo, hi, chr(lo), chr(hi)))
|
|
elif op is CHARSET:
|
|
print_(op, _hex_code(code[i: i + 256//_CODEBITS]))
|
|
i += 256//_CODEBITS
|
|
elif op is BIGCHARSET:
|
|
arg = code[i]
|
|
i += 1
|
|
mapping = list(b''.join(x.to_bytes(_sre.CODESIZE, sys.byteorder)
|
|
for x in code[i: i + 256//_sre.CODESIZE]))
|
|
print_(op, arg, mapping)
|
|
i += 256//_sre.CODESIZE
|
|
level += 1
|
|
for j in range(arg):
|
|
print_2(_hex_code(code[i: i + 256//_CODEBITS]))
|
|
i += 256//_CODEBITS
|
|
level -= 1
|
|
elif op in (MARK, GROUPREF, GROUPREF_IGNORE, GROUPREF_UNI_IGNORE,
|
|
GROUPREF_LOC_IGNORE):
|
|
arg = code[i]
|
|
i += 1
|
|
print_(op, arg)
|
|
elif op is JUMP:
|
|
skip = code[i]
|
|
print_(op, skip, to=i+skip)
|
|
i += 1
|
|
elif op is BRANCH:
|
|
skip = code[i]
|
|
print_(op, skip, to=i+skip)
|
|
while skip:
|
|
dis_(i+1, i+skip)
|
|
i += skip
|
|
start = i
|
|
skip = code[i]
|
|
if skip:
|
|
print_('branch', skip, to=i+skip)
|
|
else:
|
|
print_(FAILURE)
|
|
i += 1
|
|
elif op in (REPEAT, REPEAT_ONE, MIN_REPEAT_ONE,
|
|
POSSESSIVE_REPEAT, POSSESSIVE_REPEAT_ONE):
|
|
skip, min, max = code[i: i+3]
|
|
if max == MAXREPEAT:
|
|
max = 'MAXREPEAT'
|
|
print_(op, skip, min, max, to=i+skip)
|
|
dis_(i+3, i+skip)
|
|
i += skip
|
|
elif op is GROUPREF_EXISTS:
|
|
arg, skip = code[i: i+2]
|
|
print_(op, arg, skip, to=i+skip)
|
|
i += 2
|
|
elif op in (ASSERT, ASSERT_NOT):
|
|
skip, arg = code[i: i+2]
|
|
print_(op, skip, arg, to=i+skip)
|
|
dis_(i+2, i+skip)
|
|
i += skip
|
|
elif op is ATOMIC_GROUP:
|
|
skip = code[i]
|
|
print_(op, skip, to=i+skip)
|
|
dis_(i+1, i+skip)
|
|
i += skip
|
|
elif op is INFO:
|
|
skip, flags, min, max = code[i: i+4]
|
|
if max == MAXREPEAT:
|
|
max = 'MAXREPEAT'
|
|
print_(op, skip, bin(flags), min, max, to=i+skip)
|
|
start = i+4
|
|
if flags & SRE_INFO_PREFIX:
|
|
prefix_len, prefix_skip = code[i+4: i+6]
|
|
print_2(' prefix_skip', prefix_skip)
|
|
start = i + 6
|
|
prefix = code[start: start+prefix_len]
|
|
print_2(' prefix',
|
|
'[%s]' % ', '.join('%#02x' % x for x in prefix),
|
|
'(%r)' % ''.join(map(chr, prefix)))
|
|
start += prefix_len
|
|
print_2(' overlap', code[start: start+prefix_len])
|
|
start += prefix_len
|
|
if flags & SRE_INFO_CHARSET:
|
|
level += 1
|
|
print_2('in')
|
|
dis_(start, i+skip)
|
|
level -= 1
|
|
i += skip
|
|
else:
|
|
raise ValueError(op)
|
|
|
|
level -= 1
|
|
|
|
dis_(0, len(code))
|
|
|
|
|
|
def compile(p, flags=0):
|
|
# internal: convert pattern list to internal format
|
|
|
|
if isstring(p):
|
|
pattern = p
|
|
p = _parser.parse(p, flags)
|
|
else:
|
|
pattern = None
|
|
|
|
code = _code(p, flags)
|
|
|
|
if flags & SRE_FLAG_DEBUG:
|
|
print()
|
|
dis(code)
|
|
|
|
# map in either direction
|
|
groupindex = p.state.groupdict
|
|
indexgroup = [None] * p.state.groups
|
|
for k, i in groupindex.items():
|
|
indexgroup[i] = k
|
|
|
|
return _sre.compile(
|
|
pattern, flags | p.state.flags, code,
|
|
p.state.groups-1,
|
|
groupindex, tuple(indexgroup)
|
|
)
|