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Edit File : sre_compile.py \| Size : 19.36 KB
# -- 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 not lo and hi: 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 ) Back

Edit File : sre_compile.py | Size : 19.36 KB

# -*- 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 not lo and hi:
        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
        )

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