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-rw-r--r--lib/python2.7/sre_compile.py596
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diff --git a/lib/python2.7/sre_compile.py b/lib/python2.7/sre_compile.py
new file mode 100644
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+++ b/lib/python2.7/sre_compile.py
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+# -*- coding: utf-8 -*-
+#
+# 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, sys
+import sre_parse
+from sre_constants import *
+
+assert _sre.MAGIC == MAGIC, "SRE module mismatch"
+
+if _sre.CODESIZE == 2:
+ MAXCODE = 65535
+else:
+ MAXCODE = 0xFFFFFFFFL
+
+_LITERAL_CODES = set([LITERAL, NOT_LITERAL])
+_REPEATING_CODES = set([REPEAT, MIN_REPEAT, MAX_REPEAT])
+_SUCCESS_CODES = set([SUCCESS, FAILURE])
+_ASSERT_CODES = set([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 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
+)
+
+# 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):
+ 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(OPCODES[IN_IGNORE])
+ skip = _len(code); emit(0)
+ if op is NOT_LITERAL:
+ emit(OPCODES[NEGATE])
+ for k in (lo,) + fixes[lo]:
+ emit(OPCODES[LITERAL])
+ emit(k)
+ emit(OPCODES[FAILURE])
+ code[skip] = _len(code) - skip
+ else:
+ emit(OPCODES[OP_IGNORE[op]])
+ emit(lo)
+ else:
+ emit(OPCODES[op])
+ emit(av)
+ elif op is IN:
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ def fixup(literal, flags=flags):
+ return _sre.getlower(literal, flags)
+ else:
+ emit(OPCODES[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(OPCODES[ANY_ALL])
+ else:
+ emit(OPCODES[ANY])
+ elif op in REPEATING_CODES:
+ if flags & SRE_FLAG_TEMPLATE:
+ raise error, "internal: unsupported template operator"
+ emit(OPCODES[REPEAT])
+ skip = _len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = _len(code) - skip
+ elif _simple(av) and op is not REPEAT:
+ if op is MAX_REPEAT:
+ emit(OPCODES[REPEAT_ONE])
+ else:
+ emit(OPCODES[MIN_REPEAT_ONE])
+ skip = _len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = _len(code) - skip
+ else:
+ emit(OPCODES[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(OPCODES[MAX_UNTIL])
+ else:
+ emit(OPCODES[MIN_UNTIL])
+ elif op is SUBPATTERN:
+ if av[0]:
+ emit(OPCODES[MARK])
+ emit((av[0]-1)*2)
+ # _compile_info(code, av[1], flags)
+ _compile(code, av[1], flags)
+ if av[0]:
+ emit(OPCODES[MARK])
+ emit((av[0]-1)*2+1)
+ elif op in SUCCESS_CODES:
+ emit(OPCODES[op])
+ elif op in ASSERT_CODES:
+ emit(OPCODES[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(OPCODES[SUCCESS])
+ code[skip] = _len(code) - skip
+ elif op is CALL:
+ emit(OPCODES[op])
+ skip = _len(code); emit(0)
+ _compile(code, av, flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = _len(code) - skip
+ elif op is AT:
+ emit(OPCODES[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:
+ av = AT_UNICODE.get(av, av)
+ emit(ATCODES[av])
+ elif op is BRANCH:
+ emit(OPCODES[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(OPCODES[JUMP])
+ tailappend(_len(code)); emit(0)
+ code[skip] = _len(code) - skip
+ emit(0) # end of branch
+ for tail in tail:
+ code[tail] = _len(code) - tail
+ elif op is CATEGORY:
+ emit(OPCODES[op])
+ if flags & SRE_FLAG_LOCALE:
+ av = CH_LOCALE[av]
+ elif flags & SRE_FLAG_UNICODE:
+ av = CH_UNICODE[av]
+ emit(CHCODES[av])
+ elif op is GROUPREF:
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ else:
+ emit(OPCODES[op])
+ emit(av-1)
+ elif op is GROUPREF_EXISTS:
+ emit(OPCODES[op])
+ emit(av[0]-1)
+ skipyes = _len(code); emit(0)
+ _compile(code, av[1], flags)
+ if av[2]:
+ emit(OPCODES[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 ValueError, ("unsupported operand type", 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,
+ flags & SRE_FLAG_UNICODE):
+ emit(OPCODES[op])
+ if op is NEGATE:
+ pass
+ elif op is LITERAL:
+ emit(av)
+ elif op is RANGE:
+ 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(CHCODES[CH_LOCALE[av]])
+ elif flags & SRE_FLAG_UNICODE:
+ emit(CHCODES[CH_UNICODE[av]])
+ else:
+ emit(CHCODES[av])
+ else:
+ raise error, "internal: unsupported set operator"
+ emit(OPCODES[FAILURE])
+
+def _optimize_charset(charset, fixup, fixes, isunicode):
+ # internal: optimize character set
+ out = []
+ tail = []
+ charmap = bytearray(256)
+ for op, av in charset:
+ while True:
+ try:
+ if op is LITERAL:
+ if fixup:
+ i = fixup(av)
+ charmap[i] = 1
+ if fixes and i in fixes:
+ for k in fixes[i]:
+ 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
+ if fixup and isunicode and op is RANGE:
+ lo, hi = av
+ ranges = [av]
+ # There are only two ranges of cased astral characters:
+ # 10400-1044F (Deseret) and 118A0-118DF (Warang Citi).
+ _fixup_range(max(0x10000, lo), min(0x11fff, hi),
+ ranges, fixup)
+ for lo, hi in ranges:
+ if lo == hi:
+ tail.append((LITERAL, hi))
+ else:
+ tail.append((RANGE, (lo, hi)))
+ else:
+ tail.append((op, av))
+ break
+
+ # compress character map
+ runs = []
+ q = 0
+ while True:
+ p = charmap.find(b'\1', q)
+ if p < 0:
+ break
+ if len(runs) >= 2:
+ runs = None
+ break
+ q = charmap.find(b'\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).
+
+ # In UCS-4 mode, the BIGCHARSET opcode still supports only subsets
+ # of the basic multilingual plane; an efficient representation
+ # for all of Unicode has not yet been developed.
+
+ 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
+
+def _fixup_range(lo, hi, ranges, fixup):
+ for i in map(fixup, range(lo, hi+1)):
+ for k, (lo, hi) in enumerate(ranges):
+ if i < lo:
+ if l == lo - 1:
+ ranges[k] = (i, hi)
+ else:
+ ranges.insert(k, (i, i))
+ break
+ elif i > hi:
+ if i == hi + 1:
+ ranges[k] = (lo, i)
+ break
+ else:
+ break
+ else:
+ ranges.append((i, i))
+
+_CODEBITS = _sre.CODESIZE * 8
+_BITS_TRANS = b'0' + b'1' * 255
+def _mk_bitmap(bits, _CODEBITS=_CODEBITS, _int=int):
+ s = bytes(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
+ import array
+ if _sre.CODESIZE == 2:
+ code = 'H'
+ else:
+ code = 'I'
+ a = array.array(code, bytes(b))
+ 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 _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 lo == 0:
+ return # not worth it
+ # look for a literal prefix
+ prefix = []
+ prefixappend = prefix.append
+ prefix_skip = 0
+ charset = [] # not used
+ charsetappend = charset.append
+ if not (flags & SRE_FLAG_IGNORECASE):
+ # look for literal prefix
+ for op, av in pattern.data:
+ if op is LITERAL:
+ if len(prefix) == prefix_skip:
+ prefix_skip = prefix_skip + 1
+ prefixappend(av)
+ elif op is SUBPATTERN and len(av[1]) == 1:
+ op, av = av[1][0]
+ if op is LITERAL:
+ prefixappend(av)
+ else:
+ break
+ else:
+ break
+ # if no prefix, look for charset prefix
+ if not prefix and pattern.data:
+ op, av = pattern.data[0]
+ if op is SUBPATTERN and av[1]:
+ op, av = av[1][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
+## if prefix:
+## print "*** PREFIX", prefix, prefix_skip
+## if charset:
+## print "*** CHARSET", charset
+ # add an info block
+ emit = code.append
+ emit(OPCODES[INFO])
+ skip = len(code); emit(0)
+ # literal flag
+ mask = 0
+ if prefix:
+ mask = SRE_INFO_PREFIX
+ if len(prefix) == prefix_skip == len(pattern.data):
+ 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]
+ if hi < MAXCODE:
+ emit(hi)
+ else:
+ emit(0)
+ # add literal prefix
+ if prefix:
+ emit(len(prefix)) # length
+ emit(prefix_skip) # skip
+ code.extend(prefix)
+ # generate overlap table
+ table = [-1] + ([0]*len(prefix))
+ for i in xrange(len(prefix)):
+ table[i+1] = table[i]+1
+ while table[i+1] > 0 and prefix[i] != prefix[table[i+1]-1]:
+ table[i+1] = table[table[i+1]-1]+1
+ code.extend(table[1:]) # don't store first entry
+ elif charset:
+ _compile_charset(charset, flags, code)
+ code[skip] = len(code) - skip
+
+try:
+ unicode
+except NameError:
+ STRING_TYPES = (type(""),)
+else:
+ STRING_TYPES = (type(""), type(unicode("")))
+
+def isstring(obj):
+ for tp in STRING_TYPES:
+ if isinstance(obj, tp):
+ return 1
+ return 0
+
+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(OPCODES[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
+
+ # XXX: <fl> get rid of this limitation!
+ if p.pattern.groups > 100:
+ raise AssertionError(
+ "sorry, but this version only supports 100 named groups"
+ )
+
+ # 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
+ )
generated by cgit (git 2.34.1) at 2025-01-24 15:06:50 +0000