#
# 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 = 20171005

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)
 """

 __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)


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
 IN
 INFO
 JUMP
 LITERAL
 MARK
 MAX_UNTIL
 MIN_UNTIL
 NOT_LITERAL
 NEGATE
 RANGE
 REPEAT
 REPEAT_ONE
 SUBPATTERN
 MIN_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

 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
}

# 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")