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531 lines
16 KiB
Python
531 lines
16 KiB
Python
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#
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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 sre.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, sys
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import sre_parse
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from sre_constants import *
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assert _sre.MAGIC == MAGIC, "SRE module mismatch"
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if _sre.CODESIZE == 2:
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MAXCODE = 65535
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else:
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MAXCODE = 0xFFFFFFFFL
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def _identityfunction(x):
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return x
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def set(seq):
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s = {}
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for elem in seq:
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s[elem] = 1
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return s
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_LITERAL_CODES = set([LITERAL, NOT_LITERAL])
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_REPEATING_CODES = set([REPEAT, MIN_REPEAT, MAX_REPEAT])
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_SUCCESS_CODES = set([SUCCESS, FAILURE])
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_ASSERT_CODES = set([ASSERT, ASSERT_NOT])
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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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for op, av in pattern:
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if op in LITERAL_CODES:
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if flags & SRE_FLAG_IGNORECASE:
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emit(OPCODES[OP_IGNORE[op]])
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emit(_sre.getlower(av, flags))
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else:
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emit(OPCODES[op])
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emit(av)
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elif op is IN:
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if flags & SRE_FLAG_IGNORECASE:
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emit(OPCODES[OP_IGNORE[op]])
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def fixup(literal, flags=flags):
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return _sre.getlower(literal, flags)
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else:
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emit(OPCODES[op])
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fixup = _identityfunction
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skip = _len(code); emit(0)
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_compile_charset(av, flags, code, fixup)
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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(OPCODES[ANY_ALL])
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else:
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emit(OPCODES[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"
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emit(OPCODES[REPEAT])
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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(OPCODES[SUCCESS])
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code[skip] = _len(code) - skip
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elif _simple(av) and op is not REPEAT:
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if op is MAX_REPEAT:
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emit(OPCODES[REPEAT_ONE])
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else:
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emit(OPCODES[MIN_REPEAT_ONE])
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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(OPCODES[SUCCESS])
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code[skip] = _len(code) - skip
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else:
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emit(OPCODES[REPEAT])
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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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if op is MAX_REPEAT:
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emit(OPCODES[MAX_UNTIL])
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else:
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emit(OPCODES[MIN_UNTIL])
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elif op is SUBPATTERN:
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if av[0]:
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emit(OPCODES[MARK])
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emit((av[0]-1)*2)
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# _compile_info(code, av[1], flags)
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_compile(code, av[1], flags)
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if av[0]:
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emit(OPCODES[MARK])
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emit((av[0]-1)*2+1)
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elif op in SUCCESS_CODES:
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emit(OPCODES[op])
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elif op in ASSERT_CODES:
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emit(OPCODES[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(OPCODES[SUCCESS])
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code[skip] = _len(code) - skip
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elif op is CALL:
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emit(OPCODES[op])
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skip = _len(code); emit(0)
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_compile(code, av, flags)
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emit(OPCODES[SUCCESS])
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code[skip] = _len(code) - skip
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elif op is AT:
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emit(OPCODES[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(ATCODES[av])
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elif op is BRANCH:
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emit(OPCODES[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(OPCODES[JUMP])
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tailappend(_len(code)); emit(0)
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code[skip] = _len(code) - skip
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emit(0) # 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(OPCODES[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(CHCODES[av])
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elif op is GROUPREF:
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if flags & SRE_FLAG_IGNORECASE:
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emit(OPCODES[OP_IGNORE[op]])
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else:
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emit(OPCODES[op])
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emit(av-1)
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elif op is GROUPREF_EXISTS:
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emit(OPCODES[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(OPCODES[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 ValueError, ("unsupported operand type", op)
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def _compile_charset(charset, flags, code, fixup=None):
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# compile charset subprogram
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emit = code.append
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if fixup is None:
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fixup = _identityfunction
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for op, av in _optimize_charset(charset, fixup):
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emit(OPCODES[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(fixup(av))
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elif op is RANGE:
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emit(fixup(av[0]))
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emit(fixup(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(CHCODES[CH_LOCALE[av]])
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elif flags & SRE_FLAG_UNICODE:
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emit(CHCODES[CH_UNICODE[av]])
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else:
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emit(CHCODES[av])
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else:
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raise error, "internal: unsupported set operator"
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emit(OPCODES[FAILURE])
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def _optimize_charset(charset, fixup):
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# internal: optimize character set
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out = []
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outappend = out.append
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charmap = [0]*256
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try:
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for op, av in charset:
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if op is NEGATE:
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outappend((op, av))
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elif op is LITERAL:
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charmap[fixup(av)] = 1
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elif op is RANGE:
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for i in range(fixup(av[0]), fixup(av[1])+1):
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charmap[i] = 1
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elif op is CATEGORY:
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# XXX: could append to charmap tail
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return charset # cannot compress
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except IndexError:
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# character set contains unicode characters
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return _optimize_unicode(charset, fixup)
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# compress character map
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i = p = n = 0
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runs = []
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runsappend = runs.append
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for c in charmap:
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if c:
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if n == 0:
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p = i
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n = n + 1
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elif n:
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runsappend((p, n))
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n = 0
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i = i + 1
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if n:
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runsappend((p, n))
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if len(runs) <= 2:
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# use literal/range
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for p, n in runs:
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if n == 1:
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outappend((LITERAL, p))
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else:
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outappend((RANGE, (p, p+n-1)))
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if len(out) < len(charset):
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return out
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else:
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# use bitmap
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data = _mk_bitmap(charmap)
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outappend((CHARSET, data))
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return out
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return charset
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def _mk_bitmap(bits):
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data = []
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dataappend = data.append
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if _sre.CODESIZE == 2:
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start = (1, 0)
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else:
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start = (1L, 0L)
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m, v = start
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for c in bits:
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if c:
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v = v + m
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m = m + m
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if m > MAXCODE:
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dataappend(v)
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m, v = start
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return data
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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 16-bit word sequence, consisting of one word for
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# the number of different chunks, a sequence of 256 bytes (128 words)
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# of chunk numbers indexed by their original chunk position, and a
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# sequence of chunks (16 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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# In UCS-4 mode, the BIGCHARSET opcode still supports only subsets
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# of the basic multilingual plane; an efficient representation
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# for all of UTF-16 has not yet been developed. This means,
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# in particular, that negated charsets cannot be represented as
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# bigcharsets.
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def _optimize_unicode(charset, fixup):
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try:
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import array
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except ImportError:
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return charset
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charmap = [0]*65536
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negate = 0
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try:
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for op, av in charset:
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if op is NEGATE:
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negate = 1
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elif op is LITERAL:
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charmap[fixup(av)] = 1
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elif op is RANGE:
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for i in xrange(fixup(av[0]), fixup(av[1])+1):
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charmap[i] = 1
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elif op is CATEGORY:
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# XXX: could expand category
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return charset # cannot compress
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except IndexError:
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# non-BMP characters
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return charset
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if negate:
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if sys.maxunicode != 65535:
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# XXX: negation does not work with big charsets
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return charset
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for i in xrange(65536):
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charmap[i] = not charmap[i]
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comps = {}
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mapping = [0]*256
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block = 0
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data = []
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for i in xrange(256):
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chunk = tuple(charmap[i*256:(i+1)*256])
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new = comps.setdefault(chunk, block)
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mapping[i] = new
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if new == block:
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block = block + 1
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data = data + _mk_bitmap(chunk)
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header = [block]
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if _sre.CODESIZE == 2:
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code = 'H'
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else:
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code = 'I'
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# Convert block indices to byte array of 256 bytes
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mapping = array.array('b', mapping).tostring()
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# Convert byte array to word array
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mapping = array.array(code, mapping)
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assert mapping.itemsize == _sre.CODESIZE
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header = header + mapping.tolist()
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data[0:0] = header
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return [(BIGCHARSET, data)]
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def _simple(av):
|
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|
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# check if av is a "simple" operator
|
||
|
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lo, hi = av[2].getwidth()
|
||
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if lo == 0 and hi == MAXREPEAT:
|
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raise error, "nothing to repeat"
|
||
|
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return lo == hi == 1 and av[2][0][0] != SUBPATTERN
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||
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|
||
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def _compile_info(code, pattern, flags):
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||
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|
# 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
|
||
|
|
)
|