FM / python3.6

/snap/core18/2999/usr/lib/python3.6

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
sqlite3/	-	0755	rm
test/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	8727	0644	edit dl rm
aifc.py	32454	0644	edit dl rm
antigravity.py	477	0644	edit dl rm
argparse.py	90568	0644	edit dl rm
ast.py	12166	0644	edit dl rm
asynchat.py	11328	0644	edit dl rm
asyncore.py	20159	0644	edit dl rm
base64.py	20378	0755	edit dl rm
bdb.py	23556	0644	edit dl rm
binhex.py	13954	0644	edit dl rm
bisect.py	2595	0644	edit dl rm
bz2.py	12478	0644	edit dl rm
calendar.py	23213	0644	edit dl rm
cgi.py	36791	0755	edit dl rm
cgitb.py	12018	0644	edit dl rm
chunk.py	5425	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10614	0644	edit dl rm
codecs.py	36276	0644	edit dl rm
codeop.py	5994	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	12125	0644	edit dl rm
configparser.py	53592	0644	edit dl rm
contextlib.py	13162	0644	edit dl rm
copy.py	8815	0644	edit dl rm
copyreg.py	7007	0644	edit dl rm
cProfile.py	5370	0755	edit dl rm
crypt.py	1864	0644	edit dl rm
csv.py	16180	0644	edit dl rm
datetime.py	82034	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	84377	0644	edit dl rm
dis.py	18132	0644	edit dl rm
doctest.py	104391	0644	edit dl rm
dummy_threading.py	2815	0644	edit dl rm
enum.py	33606	0644	edit dl rm
filecmp.py	9830	0644	edit dl rm
fileinput.py	14471	0644	edit dl rm
fnmatch.py	3166	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	23639	0644	edit dl rm
ftplib.py	35617	0644	edit dl rm
functools.py	31346	0644	edit dl rm
genericpath.py	4756	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5994	0644	edit dl rm
gettext.py	21957	0644	edit dl rm
glob.py	5638	0644	edit dl rm
gzip.py	20334	0644	edit dl rm
hashlib.py	9533	0644	edit dl rm
heapq.py	22929	0644	edit dl rm
hmac.py	5057	0644	edit dl rm
imaplib.py	53295	0644	edit dl rm
imghdr.py	3795	0644	edit dl rm
imp.py	10669	0644	edit dl rm
inspect.py	116958	0644	edit dl rm
io.py	3517	0644	edit dl rm
ipaddress.py	74563	0644	edit dl rm
keyword.py	2209	0755	edit dl rm
LICENSE.txt	12769	0644	edit dl rm
linecache.py	5312	0644	edit dl rm
locale.py	77304	0644	edit dl rm
lzma.py	12983	0644	edit dl rm
macpath.py	5971	0644	edit dl rm
macurl2path.py	2732	0644	edit dl rm
mailbox.py	78624	0644	edit dl rm
mailcap.py	9067	0644	edit dl rm
mimetypes.py	21042	0644	edit dl rm
modulefinder.py	23027	0644	edit dl rm
netrc.py	5684	0644	edit dl rm
nntplib.py	43078	0644	edit dl rm
ntpath.py	21174	0644	edit dl rm
nturl2path.py	2444	0644	edit dl rm
numbers.py	10243	0644	edit dl rm
opcode.py	5822	0644	edit dl rm
operator.py	10863	0644	edit dl rm
optparse.py	60371	0644	edit dl rm
os.py	37526	0644	edit dl rm
pathlib.py	48982	0644	edit dl rm
pdb.py	61310	0755	edit dl rm
pickle.py	55691	0644	edit dl rm
pickletools.py	91775	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	21315	0644	edit dl rm
platform.py	48198	0755	edit dl rm
plistlib.py	32787	0644	edit dl rm
poplib.py	14964	0644	edit dl rm
posixpath.py	15645	0644	edit dl rm
pprint.py	20860	0644	edit dl rm
profile.py	22019	0755	edit dl rm
pstats.py	26564	0644	edit dl rm
pty.py	4763	0644	edit dl rm
pyclbr.py	13558	0644	edit dl rm
pydoc.py	103818	0755	edit dl rm
py_compile.py	7181	0644	edit dl rm
queue.py	8780	0644	edit dl rm
quopri.py	7252	0755	edit dl rm
random.py	27442	0644	edit dl rm
re.py	15552	0644	edit dl rm
reprlib.py	5336	0644	edit dl rm
rlcompleter.py	7097	0644	edit dl rm
runpy.py	11959	0644	edit dl rm
sched.py	6511	0644	edit dl rm
secrets.py	2038	0644	edit dl rm
selectors.py	19438	0644	edit dl rm
shelve.py	8515	0644	edit dl rm
shlex.py	12956	0644	edit dl rm
shutil.py	40540	0644	edit dl rm
signal.py	2123	0644	edit dl rm
site.py	21766	0644	edit dl rm
sitecustomize.py	-	0	edit dl rm
smtpd.py	34709	0755	edit dl rm
smtplib.py	44208	0755	edit dl rm
sndhdr.py	7088	0644	edit dl rm
socket.py	27443	0644	edit dl rm
socketserver.py	27010	0644	edit dl rm
sre_compile.py	19338	0644	edit dl rm
sre_constants.py	6821	0644	edit dl rm
sre_parse.py	36536	0644	edit dl rm
ssl.py	46400	0644	edit dl rm
stat.py	5038	0644	edit dl rm
statistics.py	20673	0644	edit dl rm
string.py	11795	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	62339	0644	edit dl rm
sunau.py	18095	0644	edit dl rm
symbol.py	2109	0755	edit dl rm
symtable.py	7277	0644	edit dl rm
sysconfig.py	25057	0644	edit dl rm
tabnanny.py	11401	0755	edit dl rm
tarfile.py	94969	0755	edit dl rm
telnetlib.py	23136	0644	edit dl rm
tempfile.py	31867	0644	edit dl rm
textwrap.py	19558	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	49029	0644	edit dl rm
timeit.py	13332	0755	edit dl rm
token.py	3075	0644	edit dl rm
tokenize.py	29496	0644	edit dl rm
trace.py	28723	0755	edit dl rm
traceback.py	23458	0644	edit dl rm
tracemalloc.py	16658	0644	edit dl rm
tty.py	879	0644	edit dl rm
turtle.py	143620	0644	edit dl rm
types.py	8870	0644	edit dl rm
typing.py	80274	0644	edit dl rm
uu.py	6753	0755	edit dl rm
uuid.py	23971	0644	edit dl rm
warnings.py	18488	0644	edit dl rm
wave.py	17709	0644	edit dl rm
weakref.py	20466	0644	edit dl rm
webbrowser.py	21757	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7157	0644	edit dl rm
zipfile.py	78184	0644	edit dl rm
_bootlocale.py	1301	0644	edit dl rm
_collections_abc.py	26392	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_dummy_thread.py	5118	0644	edit dl rm
_markupbase.py	14598	0644	edit dl rm
_osx_support.py	19119	0644	edit dl rm
_pydecimal.py	230228	0644	edit dl rm
_pyio.py	88097	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	24747	0644	edit dl rm
_sysconfigdata_m_linux_x86_64-linux-gnu.py	22325	0644	edit dl rm
_threading_local.py	7214	0644	edit dl rm
_weakrefset.py	5705	0644	edit dl rm
__future__.py	4841	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /snap/core18/2999/usr/lib/python3.6/sre_compile.py (19338B)

#
# Secret Labs' Regular Expression Engine
#
# convert template to internal format
#
# Copyright (c) 1997-2001 by Secret Labs AB.  All rights reserved.
#
# See the sre.py file for information on usage and redistribution.
#

"""Internal support module for sre"""

import _sre
import sre_parse
from sre_constants import *

assert _sre.MAGIC == MAGIC, "SRE module mismatch"

_LITERAL_CODES = {LITERAL, NOT_LITERAL}
_REPEATING_CODES = {REPEAT, MIN_REPEAT, MAX_REPEAT}
_SUCCESS_CODES = {SUCCESS, FAILURE}
_ASSERT_CODES = {ASSERT, ASSERT_NOT}

# Sets of lowercase characters which have the same uppercase.
_equivalences = (
    # LATIN SMALL LETTER I, LATIN SMALL LETTER DOTLESS I
    (0x69, 0x131), # iı
    # LATIN SMALL LETTER S, LATIN SMALL LETTER LONG S
    (0x73, 0x17f), # sſ
    # MICRO SIGN, GREEK SMALL LETTER MU
    (0xb5, 0x3bc), # µμ
    # COMBINING GREEK YPOGEGRAMMENI, GREEK SMALL LETTER IOTA, GREEK PROSGEGRAMMENI
    (0x345, 0x3b9, 0x1fbe), # \u0345ιι
    # GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS, GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA
    (0x390, 0x1fd3), # ΐΐ
    # GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS, GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA
    (0x3b0, 0x1fe3), # ΰΰ
    # GREEK SMALL LETTER BETA, GREEK BETA SYMBOL
    (0x3b2, 0x3d0), # βϐ
    # GREEK SMALL LETTER EPSILON, GREEK LUNATE EPSILON SYMBOL
    (0x3b5, 0x3f5), # εϵ
    # GREEK SMALL LETTER THETA, GREEK THETA SYMBOL
    (0x3b8, 0x3d1), # θϑ
    # GREEK SMALL LETTER KAPPA, GREEK KAPPA SYMBOL
    (0x3ba, 0x3f0), # κϰ
    # GREEK SMALL LETTER PI, GREEK PI SYMBOL
    (0x3c0, 0x3d6), # πϖ
    # GREEK SMALL LETTER RHO, GREEK RHO SYMBOL
    (0x3c1, 0x3f1), # ρϱ
    # GREEK SMALL LETTER FINAL SIGMA, GREEK SMALL LETTER SIGMA
    (0x3c2, 0x3c3), # ςσ
    # GREEK SMALL LETTER PHI, GREEK PHI SYMBOL
    (0x3c6, 0x3d5), # φϕ
    # LATIN SMALL LETTER S WITH DOT ABOVE, LATIN SMALL LETTER LONG S WITH DOT ABOVE
    (0x1e61, 0x1e9b), # ṡẛ
    # LATIN SMALL LIGATURE LONG S T, LATIN SMALL LIGATURE ST
    (0xfb05, 0xfb06), # ﬅﬆ
)

# Maps the lowercase code to lowercase codes which have the same uppercase.
_ignorecase_fixes = {i: tuple(j for j in t if i != j)
                     for t in _equivalences for i in t}

def _compile(code, pattern, flags):
    # internal: compile a (sub)pattern
    emit = code.append
    _len = len
    LITERAL_CODES = _LITERAL_CODES
    REPEATING_CODES = _REPEATING_CODES
    SUCCESS_CODES = _SUCCESS_CODES
    ASSERT_CODES = _ASSERT_CODES
    if (flags & SRE_FLAG_IGNORECASE and
            not (flags & SRE_FLAG_LOCALE) and
            flags & SRE_FLAG_UNICODE and
            not (flags & SRE_FLAG_ASCII)):
        fixes = _ignorecase_fixes
    else:
        fixes = None
    for op, av in pattern:
        if op in LITERAL_CODES:
            if flags & SRE_FLAG_IGNORECASE:
                lo = _sre.getlower(av, flags)
                if fixes and lo in fixes:
                    emit(IN_IGNORE)
                    skip = _len(code); emit(0)
                    if op is NOT_LITERAL:
                        emit(NEGATE)
                    for k in (lo,) + fixes[lo]:
                        emit(LITERAL)
                        emit(k)
                    emit(FAILURE)
                    code[skip] = _len(code) - skip
                else:
                    emit(OP_IGNORE[op])
                    emit(lo)
            else:
                emit(op)
                emit(av)
        elif op is IN:
            if flags & SRE_FLAG_IGNORECASE:
                emit(OP_IGNORE[op])
                def fixup(literal, flags=flags):
                    return _sre.getlower(literal, flags)
            else:
                emit(op)
                fixup = None
            skip = _len(code); emit(0)
            _compile_charset(av, flags, code, fixup, fixes)
            code[skip] = _len(code) - skip
        elif op is ANY:
            if flags & SRE_FLAG_DOTALL:
                emit(ANY_ALL)
            else:
                emit(ANY)
        elif op in REPEATING_CODES:
            if flags & SRE_FLAG_TEMPLATE:
                raise error("internal: unsupported template operator %r" % (op,))
            elif _simple(av) and op is not REPEAT:
                if op is MAX_REPEAT:
                    emit(REPEAT_ONE)
                else:
                    emit(MIN_REPEAT_ONE)
                skip = _len(code); emit(0)
                emit(av[0])
                emit(av[1])
                _compile(code, av[2], flags)
                emit(SUCCESS)
                code[skip] = _len(code) - skip
            else:
                emit(REPEAT)
                skip = _len(code); emit(0)
                emit(av[0])
                emit(av[1])
                _compile(code, av[2], flags)
                code[skip] = _len(code) - skip
                if op is MAX_REPEAT:
                    emit(MAX_UNTIL)
                else:
                    emit(MIN_UNTIL)
        elif op is SUBPATTERN:
            group, add_flags, del_flags, p = av
            if group:
                emit(MARK)
                emit((group-1)*2)
            # _compile_info(code, p, (flags | add_flags) & ~del_flags)
            _compile(code, p, (flags | add_flags) & ~del_flags)
            if group:
                emit(MARK)
                emit((group-1)*2+1)
        elif op in SUCCESS_CODES:
            emit(op)
        elif op in ASSERT_CODES:
            emit(op)
            skip = _len(code); emit(0)
            if av[0] >= 0:
                emit(0) # look ahead
            else:
                lo, hi = av[1].getwidth()
                if lo != hi:
                    raise error("look-behind requires fixed-width pattern")
                emit(lo) # look behind
            _compile(code, av[1], flags)
            emit(SUCCESS)
            code[skip] = _len(code) - skip
        elif op is CALL:
            emit(op)
            skip = _len(code); emit(0)
            _compile(code, av, flags)
            emit(SUCCESS)
            code[skip] = _len(code) - skip
        elif op is AT:
            emit(op)
            if flags & SRE_FLAG_MULTILINE:
                av = AT_MULTILINE.get(av, av)
            if flags & SRE_FLAG_LOCALE:
                av = AT_LOCALE.get(av, av)
            elif (flags & SRE_FLAG_UNICODE) and not (flags & SRE_FLAG_ASCII):
                av = AT_UNICODE.get(av, av)
            emit(av)
        elif op is BRANCH:
            emit(op)
            tail = []
            tailappend = tail.append
            for av in av[1]:
                skip = _len(code); emit(0)
                # _compile_info(code, av, flags)
                _compile(code, av, flags)
                emit(JUMP)
                tailappend(_len(code)); emit(0)
                code[skip] = _len(code) - skip
            emit(FAILURE) # end of branch
            for tail in tail:
                code[tail] = _len(code) - tail
        elif op is CATEGORY:
            emit(op)
            if flags & SRE_FLAG_LOCALE:
                av = CH_LOCALE[av]
            elif (flags & SRE_FLAG_UNICODE) and not (flags & SRE_FLAG_ASCII):
                av = CH_UNICODE[av]
            emit(av)
        elif op is GROUPREF:
            if flags & SRE_FLAG_IGNORECASE:
                emit(OP_IGNORE[op])
            else:
                emit(op)
            emit(av-1)
        elif op is GROUPREF_EXISTS:
            emit(op)
            emit(av[0]-1)
            skipyes = _len(code); emit(0)
            _compile(code, av[1], flags)
            if av[2]:
                emit(JUMP)
                skipno = _len(code); emit(0)
                code[skipyes] = _len(code) - skipyes + 1
                _compile(code, av[2], flags)
                code[skipno] = _len(code) - skipno
            else:
                code[skipyes] = _len(code) - skipyes + 1
        else:
            raise error("internal: unsupported operand type %r" % (op,))

def _compile_charset(charset, flags, code, fixup=None, fixes=None):
    # compile charset subprogram
    emit = code.append
    for op, av in _optimize_charset(charset, fixup, fixes):
        emit(op)
        if op is NEGATE:
            pass
        elif op is LITERAL:
            emit(av)
        elif op is RANGE or op is RANGE_IGNORE:
            emit(av[0])
            emit(av[1])
        elif op is CHARSET:
            code.extend(av)
        elif op is BIGCHARSET:
            code.extend(av)
        elif op is CATEGORY:
            if flags & SRE_FLAG_LOCALE:
                emit(CH_LOCALE[av])
            elif (flags & SRE_FLAG_UNICODE) and not (flags & SRE_FLAG_ASCII):
                emit(CH_UNICODE[av])
            else:
                emit(av)
        else:
            raise error("internal: unsupported set operator %r" % (op,))
    emit(FAILURE)

def _optimize_charset(charset, fixup, fixes):
    # internal: optimize character set
    out = []
    tail = []
    charmap = bytearray(256)
    for op, av in charset:
        while True:
            try:
                if op is LITERAL:
                    if fixup:
                        lo = fixup(av)
                        charmap[lo] = 1
                        if fixes and lo in fixes:
                            for k in fixes[lo]:
                                charmap[k] = 1
                    else:
                        charmap[av] = 1
                elif op is RANGE:
                    r = range(av[0], av[1]+1)
                    if fixup:
                        r = map(fixup, r)
                    if fixup and fixes:
                        for i in r:
                            charmap[i] = 1
                            if i in fixes:
                                for k in fixes[i]:
                                    charmap[k] = 1
                    else:
                        for i in r:
                            charmap[i] = 1
                elif op is NEGATE:
                    out.append((op, av))
                else:
                    tail.append((op, av))
            except IndexError:
                if len(charmap) == 256:
                    # character set contains non-UCS1 character codes
                    charmap += b'\0' * 0xff00
                    continue
                # Character set contains non-BMP character codes.
                # There are only two ranges of cased non-BMP characters:
                # 10400-1044F (Deseret) and 118A0-118DF (Warang Citi),
                # and for both ranges RANGE_IGNORE works.
                if fixup and op is RANGE:
                    op = RANGE_IGNORE
                tail.append((op, av))
            break

# compress character map
    runs = []
    q = 0
    while True:
        p = charmap.find(1, q)
        if p < 0:
            break
        if len(runs) >= 2:
            runs = None
            break
        q = charmap.find(0, p)
        if q < 0:
            runs.append((p, len(charmap)))
            break
        runs.append((p, q))
    if runs is not None:
        # use literal/range
        for p, q in runs:
            if q - p == 1:
                out.append((LITERAL, p))
            else:
                out.append((RANGE, (p, q - 1)))
        out += tail
        # if the case was changed or new representation is more compact
        if fixup or len(out) < len(charset):
            return out
        # else original character set is good enough
        return charset

# use bitmap
    if len(charmap) == 256:
        data = _mk_bitmap(charmap)
        out.append((CHARSET, data))
        out += tail
        return out

# To represent a big charset, first a bitmap of all characters in the
    # set is constructed. Then, this bitmap is sliced into chunks of 256
    # characters, duplicate chunks are eliminated, and each chunk is
    # given a number. In the compiled expression, the charset is
    # represented by a 32-bit word sequence, consisting of one word for
    # the number of different chunks, a sequence of 256 bytes (64 words)
    # of chunk numbers indexed by their original chunk position, and a
    # sequence of 256-bit chunks (8 words each).

# Compression is normally good: in a typical charset, large ranges of
    # Unicode will be either completely excluded (e.g. if only cyrillic
    # letters are to be matched), or completely included (e.g. if large
    # subranges of Kanji match). These ranges will be represented by
    # chunks of all one-bits or all zero-bits.

# Matching can be also done efficiently: the more significant byte of
    # the Unicode character is an index into the chunk number, and the
    # less significant byte is a bit index in the chunk (just like the
    # CHARSET matching).

charmap = bytes(charmap) # should be hashable
    comps = {}
    mapping = bytearray(256)
    block = 0
    data = bytearray()
    for i in range(0, 65536, 256):
        chunk = charmap[i: i + 256]
        if chunk in comps:
            mapping[i // 256] = comps[chunk]
        else:
            mapping[i // 256] = comps[chunk] = block
            block += 1
            data += chunk
    data = _mk_bitmap(data)
    data[0:0] = [block] + _bytes_to_codes(mapping)
    out.append((BIGCHARSET, data))
    out += tail
    return out

_CODEBITS = _sre.CODESIZE * 8
MAXCODE = (1 << _CODEBITS) - 1
_BITS_TRANS = b'0' + b'1' * 255
def _mk_bitmap(bits, _CODEBITS=_CODEBITS, _int=int):
    s = bits.translate(_BITS_TRANS)[::-1]
    return [_int(s[i - _CODEBITS: i], 2)
            for i in range(len(s), 0, -_CODEBITS)]

def _bytes_to_codes(b):
    # Convert block indices to word array
    a = memoryview(b).cast('I')
    assert a.itemsize == _sre.CODESIZE
    assert len(a) * a.itemsize == len(b)
    return a.tolist()

def _simple(av):
    # check if av is a "simple" operator
    lo, hi = av[2].getwidth()
    return lo == hi == 1 and av[2][0][0] != SUBPATTERN

def _generate_overlap_table(prefix):
    """
    Generate an overlap table for the following prefix.
    An overlap table is a table of the same size as the prefix which
    informs about the potential self-overlap for each index in the prefix:
    - if overlap[i] == 0, prefix[i:] can't overlap prefix[0:...]
    - if overlap[i] == k with 0 < k <= i, prefix[i-k+1:i+1] overlaps with
      prefix[0:k]
    """
    table = [0] * len(prefix)
    for i in range(1, len(prefix)):
        idx = table[i - 1]
        while prefix[i] != prefix[idx]:
            if idx == 0:
                table[i] = 0
                break
            idx = table[idx - 1]
        else:
            table[i] = idx + 1
    return table

def _get_literal_prefix(pattern):
    # look for literal prefix
    prefix = []
    prefixappend = prefix.append
    prefix_skip = None
    for op, av in pattern.data:
        if op is LITERAL:
            prefixappend(av)
        elif op is SUBPATTERN:
            group, add_flags, del_flags, p = av
            if add_flags & SRE_FLAG_IGNORECASE:
                break
            prefix1, prefix_skip1, got_all = _get_literal_prefix(p)
            if prefix_skip is None:
                if group is not None:
                    prefix_skip = len(prefix)
                elif prefix_skip1 is not None:
                    prefix_skip = len(prefix) + prefix_skip1
            prefix.extend(prefix1)
            if not got_all:
                break
        else:
            break
    else:
        return prefix, prefix_skip, True
    return prefix, prefix_skip, False

def _get_charset_prefix(pattern):
    charset = [] # not used
    charsetappend = charset.append
    if pattern.data:
        op, av = pattern.data[0]
        if op is SUBPATTERN:
            group, add_flags, del_flags, p = av
            if p and not (add_flags & SRE_FLAG_IGNORECASE):
                op, av = p[0]
                if op is LITERAL:
                    charsetappend((op, av))
                elif op is BRANCH:
                    c = []
                    cappend = c.append
                    for p in av[1]:
                        if not p:
                            break
                        op, av = p[0]
                        if op is LITERAL:
                            cappend((op, av))
                        else:
                            break
                    else:
                        charset = c
        elif op is BRANCH:
            c = []
            cappend = c.append
            for p in av[1]:
                if not p:
                    break
                op, av = p[0]
                if op is LITERAL:
                    cappend((op, av))
                else:
                    break
            else:
                charset = c
        elif op is IN:
            charset = av
    return charset

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):
        # look for literal prefix
        prefix, prefix_skip, got_all = _get_literal_prefix(pattern)
        # if no prefix, look for charset prefix
        if not prefix:
            charset = _get_charset_prefix(pattern)
##     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:
        _compile_charset(charset, flags, code)
    code[skip] = len(code) - skip

def isstring(obj):
    return isinstance(obj, (str, bytes))

def _code(p, flags):

flags = p.pattern.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 compile(p, flags=0):
    # internal: convert pattern list to internal format

if isstring(p):
        pattern = p
        p = sre_parse.parse(p, flags)
    else:
        pattern = None

code = _code(p, flags)

# print(code)

# map in either direction
    groupindex = p.pattern.groupdict
    indexgroup = [None] * p.pattern.groups
    for k, i in groupindex.items():
        indexgroup[i] = k

return _sre.compile(
        pattern, flags | p.pattern.flags, code,
        p.pattern.groups-1,
        groupindex, indexgroup
        )

cmd: