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Viewing: /snap/core18/2999/usr/lib/python3.6/sre_constants.py
#
# Secret Labs' Regular Expression Engine
#
# various symbols used by the regular expression engine.
# run this script to update the _sre include files!
#
# Copyright (c) 1998-2001 by Secret Labs AB. All rights reserved.
#
# See the sre.py file for information on usage and redistribution.
#
"""Internal support module for sre"""
# update when constants are added or removed
MAGIC = 20140917
from _sre import MAXREPEAT, MAXGROUPS
# SRE standard exception (access as sre.error)
# should this really be here?
class error(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)
"""
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)
class _NamedIntConstant(int):
def __new__(cls, value, name):
self = super(_NamedIntConstant, cls).__new__(cls, value)
self.name = name
return self
def __str__(self):
return self.name
__repr__ = __str__
MAXREPEAT = _NamedIntConstant(MAXREPEAT, 'MAXREPEAT')
def _makecodes(names):
names = names.strip().split()
items = [_NamedIntConstant(i, name) for i, name in enumerate(names)]
globals().update({item.name: item for item in items})
return items
# operators
# failure=0 success=1 (just because it looks better that way :-)
OPCODES = _makecodes("""
FAILURE SUCCESS
ANY ANY_ALL
ASSERT ASSERT_NOT
AT
BRANCH
CALL
CATEGORY
CHARSET BIGCHARSET
GROUPREF GROUPREF_EXISTS GROUPREF_IGNORE
IN IN_IGNORE
INFO
JUMP
LITERAL LITERAL_IGNORE
MARK
MAX_UNTIL
MIN_UNTIL
NOT_LITERAL NOT_LITERAL_IGNORE
NEGATE
RANGE
REPEAT
REPEAT_ONE
SUBPATTERN
MIN_REPEAT_ONE
RANGE_IGNORE
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 = {
GROUPREF: GROUPREF_IGNORE,
IN: IN_IGNORE,
LITERAL: LITERAL_IGNORE,
NOT_LITERAL: NOT_LITERAL_IGNORE,
RANGE: RANGE_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
}
# flags
SRE_FLAG_TEMPLATE = 1 # template mode (disable backtracking)
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
if __name__ == "__main__":
def dump(f, d, prefix):
items = sorted(d)
for item in items:
f.write("#define %s_%s %d\n" % (prefix, item, item))
with open("sre_constants.h", "w") as f:
f.write("""\
/*
* Secret Labs' Regular Expression Engine
*
* regular expression matching engine
*
* NOTE: This file is generated by sre_constants.py. If you need
* to change anything in here, edit sre_constants.py and run it.
*
* Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
*
* See the _sre.c file for information on usage and redistribution.
*/
""")
f.write("#define SRE_MAGIC %d\n" % MAGIC)
dump(f, OPCODES, "SRE_OP")
dump(f, ATCODES, "SRE")
dump(f, CHCODES, "SRE")
f.write("#define SRE_FLAG_TEMPLATE %d\n" % SRE_FLAG_TEMPLATE)
f.write("#define SRE_FLAG_IGNORECASE %d\n" % SRE_FLAG_IGNORECASE)
f.write("#define SRE_FLAG_LOCALE %d\n" % SRE_FLAG_LOCALE)
f.write("#define SRE_FLAG_MULTILINE %d\n" % SRE_FLAG_MULTILINE)
f.write("#define SRE_FLAG_DOTALL %d\n" % SRE_FLAG_DOTALL)
f.write("#define SRE_FLAG_UNICODE %d\n" % SRE_FLAG_UNICODE)
f.write("#define SRE_FLAG_VERBOSE %d\n" % SRE_FLAG_VERBOSE)
f.write("#define SRE_FLAG_DEBUG %d\n" % SRE_FLAG_DEBUG)
f.write("#define SRE_FLAG_ASCII %d\n" % SRE_FLAG_ASCII)
f.write("#define SRE_INFO_PREFIX %d\n" % SRE_INFO_PREFIX)
f.write("#define SRE_INFO_LITERAL %d\n" % SRE_INFO_LITERAL)
f.write("#define SRE_INFO_CHARSET %d\n" % SRE_INFO_CHARSET)
print("done")