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# Secret Labs' Regular Expression Engine

# various symbols used by the regular expression engine.

# run this script to update the _sre include files!

# See the __init__.py file for information on usage and redistribution.

"""Internal support module for sre"""

# update when constants are added or removed

MAGIC = 20230612

from _sre import MAXREPEAT, MAXGROUPS # noqa: F401

# SRE standard exception (access as sre.error)

# should this really be here?

class PatternError(Exception):

"""Exception raised for invalid regular expressions.

Attributes:

msg: The unformatted error message

pattern: The regular expression pattern

pos: The index in the pattern where compilation failed (may be None)

lineno: The line corresponding to pos (may be None)

colno: The column corresponding to pos (may be None)

"""

__module__ = 're'

def __init__(self, msg, pattern=None, pos=None):

self.msg = msg

self.pattern = pattern

self.pos = pos

if pattern is not None and pos is not None:

msg = '%s at position %d' % (msg, pos)

if isinstance(pattern, str):

newline = '\n'

else:

newline = b'\n'

self.lineno = pattern.count(newline, 0, pos) + 1

self.colno = pos - pattern.rfind(newline, 0, pos)

if newline in pattern:

msg = '%s (line %d, column %d)' % (msg, self.lineno, self.colno)

else:

self.lineno = self.colno = None

super().__init__(msg)

# Backward compatibility after renaming in 3.13

error = PatternError

class _NamedIntConstant(int):

def __new__(cls, value, name):

self = super(_NamedIntConstant, cls).__new__(cls, value)

self.name = name

return self

def __repr__(self):

return self.name

__reduce__ = None

MAXREPEAT = _NamedIntConstant(MAXREPEAT, 'MAXREPEAT')

def _makecodes(*names):

items = [_NamedIntConstant(i, name) for i, name in enumerate(names)]

globals().update({item.name: item for item in items})

return items

# operators

OPCODES = _makecodes(

# failure=0 success=1 (just because it looks better that way :-)

'FAILURE', 'SUCCESS',

'ANY', 'ANY_ALL',

'ASSERT', 'ASSERT_NOT',

'AT',

'BRANCH',

'CATEGORY',

'CHARSET', 'BIGCHARSET',

'GROUPREF', 'GROUPREF_EXISTS',

'IN',

'INFO',

'JUMP',

'LITERAL',

'MARK',

'MAX_UNTIL',

'MIN_UNTIL',

'NOT_LITERAL',

'NEGATE',

'RANGE',

'REPEAT',

'REPEAT_ONE',

'SUBPATTERN',

'MIN_REPEAT_ONE',

'ATOMIC_GROUP',

'POSSESSIVE_REPEAT',

'POSSESSIVE_REPEAT_ONE',

'GROUPREF_IGNORE',

'IN_IGNORE',

'LITERAL_IGNORE',

'NOT_LITERAL_IGNORE',

'GROUPREF_LOC_IGNORE',

'IN_LOC_IGNORE',

'LITERAL_LOC_IGNORE',

'NOT_LITERAL_LOC_IGNORE',

'GROUPREF_UNI_IGNORE',

'IN_UNI_IGNORE',

'LITERAL_UNI_IGNORE',

'NOT_LITERAL_UNI_IGNORE',

'RANGE_UNI_IGNORE',

# The following opcodes are only occurred in the parser output,

# but not in the compiled code.

'MIN_REPEAT', 'MAX_REPEAT',

)

del OPCODES[-2:] # remove MIN_REPEAT and MAX_REPEAT

# positions

ATCODES = _makecodes(

'AT_BEGINNING', 'AT_BEGINNING_LINE', 'AT_BEGINNING_STRING',

'AT_BOUNDARY', 'AT_NON_BOUNDARY',

'AT_END', 'AT_END_LINE', 'AT_END_STRING',

'AT_LOC_BOUNDARY', 'AT_LOC_NON_BOUNDARY',

'AT_UNI_BOUNDARY', 'AT_UNI_NON_BOUNDARY',

)

# categories

CHCODES = _makecodes(

'CATEGORY_DIGIT', 'CATEGORY_NOT_DIGIT',

'CATEGORY_SPACE', 'CATEGORY_NOT_SPACE',

'CATEGORY_WORD', 'CATEGORY_NOT_WORD',

'CATEGORY_LINEBREAK', 'CATEGORY_NOT_LINEBREAK',

'CATEGORY_LOC_WORD', 'CATEGORY_LOC_NOT_WORD',

'CATEGORY_UNI_DIGIT', 'CATEGORY_UNI_NOT_DIGIT',

'CATEGORY_UNI_SPACE', 'CATEGORY_UNI_NOT_SPACE',

'CATEGORY_UNI_WORD', 'CATEGORY_UNI_NOT_WORD',

'CATEGORY_UNI_LINEBREAK', 'CATEGORY_UNI_NOT_LINEBREAK',

)

# replacement operations for "ignore case" mode

OP_IGNORE = {

LITERAL: LITERAL_IGNORE,

NOT_LITERAL: NOT_LITERAL_IGNORE,

}

OP_LOCALE_IGNORE = {

LITERAL: LITERAL_LOC_IGNORE,

NOT_LITERAL: NOT_LITERAL_LOC_IGNORE,

}

OP_UNICODE_IGNORE = {

LITERAL: LITERAL_UNI_IGNORE,

NOT_LITERAL: NOT_LITERAL_UNI_IGNORE,

}

AT_MULTILINE = {

AT_BEGINNING: AT_BEGINNING_LINE,

AT_END: AT_END_LINE

}

AT_LOCALE = {

AT_BOUNDARY: AT_LOC_BOUNDARY,

AT_NON_BOUNDARY: AT_LOC_NON_BOUNDARY

}

AT_UNICODE = {

AT_BOUNDARY: AT_UNI_BOUNDARY,

AT_NON_BOUNDARY: AT_UNI_NON_BOUNDARY

}

CH_LOCALE = {

CATEGORY_DIGIT: CATEGORY_DIGIT,

CATEGORY_NOT_DIGIT: CATEGORY_NOT_DIGIT,

CATEGORY_SPACE: CATEGORY_SPACE,

CATEGORY_NOT_SPACE: CATEGORY_NOT_SPACE,

CATEGORY_WORD: CATEGORY_LOC_WORD,

CATEGORY_NOT_WORD: CATEGORY_LOC_NOT_WORD,

CATEGORY_LINEBREAK: CATEGORY_LINEBREAK,

CATEGORY_NOT_LINEBREAK: CATEGORY_NOT_LINEBREAK

}

CH_UNICODE = {

CATEGORY_DIGIT: CATEGORY_UNI_DIGIT,

CATEGORY_NOT_DIGIT: CATEGORY_UNI_NOT_DIGIT,

CATEGORY_SPACE: CATEGORY_UNI_SPACE,

CATEGORY_NOT_SPACE: CATEGORY_UNI_NOT_SPACE,

CATEGORY_WORD: CATEGORY_UNI_WORD,

CATEGORY_NOT_WORD: CATEGORY_UNI_NOT_WORD,

CATEGORY_LINEBREAK: CATEGORY_UNI_LINEBREAK,

CATEGORY_NOT_LINEBREAK: CATEGORY_UNI_NOT_LINEBREAK

}

CH_NEGATE = dict(zip(CHCODES[::2] + CHCODES[1::2], CHCODES[1::2] + CHCODES[::2]))

# flags

SRE_FLAG_IGNORECASE = 2 # case insensitive

SRE_FLAG_LOCALE = 4 # honour system locale

SRE_FLAG_MULTILINE = 8 # treat target as multiline string

SRE_FLAG_DOTALL = 16 # treat target as a single string

SRE_FLAG_UNICODE = 32 # use unicode "locale"

SRE_FLAG_VERBOSE = 64 # ignore whitespace and comments

SRE_FLAG_DEBUG = 128 # debugging

SRE_FLAG_ASCII = 256 # use ascii "locale"

# flags for INFO primitive

SRE_INFO_PREFIX = 1 # has prefix

SRE_INFO_LITERAL = 2 # entire pattern is literal (given by prefix)

SRE_INFO_CHARSET = 4 # pattern starts with character from given set

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