mirror of
https://github.com/KevinMidboe/Node-Com-Handler.git
synced 2025-10-29 17:50:27 +00:00
Major cleanup, added all old files (python2) to 'old_v0.1' folder
This commit is contained in:
891
flask/lib/python3.4/sre_parse.py
Normal file
891
flask/lib/python3.4/sre_parse.py
Normal file
@@ -0,0 +1,891 @@
|
||||
#
|
||||
# Secret Labs' Regular Expression Engine
|
||||
#
|
||||
# convert re-style regular expression to sre pattern
|
||||
#
|
||||
# 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"""
|
||||
|
||||
# XXX: show string offset and offending character for all errors
|
||||
|
||||
from sre_constants import *
|
||||
from _sre import MAXREPEAT
|
||||
|
||||
SPECIAL_CHARS = ".\\[{()*+?^$|"
|
||||
REPEAT_CHARS = "*+?{"
|
||||
|
||||
DIGITS = set("0123456789")
|
||||
|
||||
OCTDIGITS = set("01234567")
|
||||
HEXDIGITS = set("0123456789abcdefABCDEF")
|
||||
|
||||
WHITESPACE = set(" \t\n\r\v\f")
|
||||
|
||||
ESCAPES = {
|
||||
r"\a": (LITERAL, ord("\a")),
|
||||
r"\b": (LITERAL, ord("\b")),
|
||||
r"\f": (LITERAL, ord("\f")),
|
||||
r"\n": (LITERAL, ord("\n")),
|
||||
r"\r": (LITERAL, ord("\r")),
|
||||
r"\t": (LITERAL, ord("\t")),
|
||||
r"\v": (LITERAL, ord("\v")),
|
||||
r"\\": (LITERAL, ord("\\"))
|
||||
}
|
||||
|
||||
CATEGORIES = {
|
||||
r"\A": (AT, AT_BEGINNING_STRING), # start of string
|
||||
r"\b": (AT, AT_BOUNDARY),
|
||||
r"\B": (AT, AT_NON_BOUNDARY),
|
||||
r"\d": (IN, [(CATEGORY, CATEGORY_DIGIT)]),
|
||||
r"\D": (IN, [(CATEGORY, CATEGORY_NOT_DIGIT)]),
|
||||
r"\s": (IN, [(CATEGORY, CATEGORY_SPACE)]),
|
||||
r"\S": (IN, [(CATEGORY, CATEGORY_NOT_SPACE)]),
|
||||
r"\w": (IN, [(CATEGORY, CATEGORY_WORD)]),
|
||||
r"\W": (IN, [(CATEGORY, CATEGORY_NOT_WORD)]),
|
||||
r"\Z": (AT, AT_END_STRING), # end of string
|
||||
}
|
||||
|
||||
FLAGS = {
|
||||
# standard flags
|
||||
"i": SRE_FLAG_IGNORECASE,
|
||||
"L": SRE_FLAG_LOCALE,
|
||||
"m": SRE_FLAG_MULTILINE,
|
||||
"s": SRE_FLAG_DOTALL,
|
||||
"x": SRE_FLAG_VERBOSE,
|
||||
# extensions
|
||||
"a": SRE_FLAG_ASCII,
|
||||
"t": SRE_FLAG_TEMPLATE,
|
||||
"u": SRE_FLAG_UNICODE,
|
||||
}
|
||||
|
||||
class Pattern:
|
||||
# master pattern object. keeps track of global attributes
|
||||
def __init__(self):
|
||||
self.flags = 0
|
||||
self.open = []
|
||||
self.groups = 1
|
||||
self.groupdict = {}
|
||||
self.lookbehind = 0
|
||||
|
||||
def opengroup(self, name=None):
|
||||
gid = self.groups
|
||||
self.groups = gid + 1
|
||||
if name is not None:
|
||||
ogid = self.groupdict.get(name, None)
|
||||
if ogid is not None:
|
||||
raise error("redefinition of group name %s as group %d; "
|
||||
"was group %d" % (repr(name), gid, ogid))
|
||||
self.groupdict[name] = gid
|
||||
self.open.append(gid)
|
||||
return gid
|
||||
def closegroup(self, gid):
|
||||
self.open.remove(gid)
|
||||
def checkgroup(self, gid):
|
||||
return gid < self.groups and gid not in self.open
|
||||
|
||||
class SubPattern:
|
||||
# a subpattern, in intermediate form
|
||||
def __init__(self, pattern, data=None):
|
||||
self.pattern = pattern
|
||||
if data is None:
|
||||
data = []
|
||||
self.data = data
|
||||
self.width = None
|
||||
def dump(self, level=0):
|
||||
nl = True
|
||||
seqtypes = (tuple, list)
|
||||
for op, av in self.data:
|
||||
print(level*" " + op, end='')
|
||||
if op == IN:
|
||||
# member sublanguage
|
||||
print()
|
||||
for op, a in av:
|
||||
print((level+1)*" " + op, a)
|
||||
elif op == BRANCH:
|
||||
print()
|
||||
for i, a in enumerate(av[1]):
|
||||
if i:
|
||||
print(level*" " + "or")
|
||||
a.dump(level+1)
|
||||
elif op == GROUPREF_EXISTS:
|
||||
condgroup, item_yes, item_no = av
|
||||
print('', condgroup)
|
||||
item_yes.dump(level+1)
|
||||
if item_no:
|
||||
print(level*" " + "else")
|
||||
item_no.dump(level+1)
|
||||
elif isinstance(av, seqtypes):
|
||||
nl = False
|
||||
for a in av:
|
||||
if isinstance(a, SubPattern):
|
||||
if not nl:
|
||||
print()
|
||||
a.dump(level+1)
|
||||
nl = True
|
||||
else:
|
||||
if not nl:
|
||||
print(' ', end='')
|
||||
print(a, end='')
|
||||
nl = False
|
||||
if not nl:
|
||||
print()
|
||||
else:
|
||||
print('', av)
|
||||
def __repr__(self):
|
||||
return repr(self.data)
|
||||
def __len__(self):
|
||||
return len(self.data)
|
||||
def __delitem__(self, index):
|
||||
del self.data[index]
|
||||
def __getitem__(self, index):
|
||||
if isinstance(index, slice):
|
||||
return SubPattern(self.pattern, self.data[index])
|
||||
return self.data[index]
|
||||
def __setitem__(self, index, code):
|
||||
self.data[index] = code
|
||||
def insert(self, index, code):
|
||||
self.data.insert(index, code)
|
||||
def append(self, code):
|
||||
self.data.append(code)
|
||||
def getwidth(self):
|
||||
# determine the width (min, max) for this subpattern
|
||||
if self.width:
|
||||
return self.width
|
||||
lo = hi = 0
|
||||
UNITCODES = (ANY, RANGE, IN, LITERAL, NOT_LITERAL, CATEGORY)
|
||||
REPEATCODES = (MIN_REPEAT, MAX_REPEAT)
|
||||
for op, av in self.data:
|
||||
if op is BRANCH:
|
||||
i = MAXREPEAT - 1
|
||||
j = 0
|
||||
for av in av[1]:
|
||||
l, h = av.getwidth()
|
||||
i = min(i, l)
|
||||
j = max(j, h)
|
||||
lo = lo + i
|
||||
hi = hi + j
|
||||
elif op is CALL:
|
||||
i, j = av.getwidth()
|
||||
lo = lo + i
|
||||
hi = hi + j
|
||||
elif op is SUBPATTERN:
|
||||
i, j = av[1].getwidth()
|
||||
lo = lo + i
|
||||
hi = hi + j
|
||||
elif op in REPEATCODES:
|
||||
i, j = av[2].getwidth()
|
||||
lo = lo + i * av[0]
|
||||
hi = hi + j * av[1]
|
||||
elif op in UNITCODES:
|
||||
lo = lo + 1
|
||||
hi = hi + 1
|
||||
elif op == SUCCESS:
|
||||
break
|
||||
self.width = min(lo, MAXREPEAT - 1), min(hi, MAXREPEAT)
|
||||
return self.width
|
||||
|
||||
class Tokenizer:
|
||||
def __init__(self, string):
|
||||
self.istext = isinstance(string, str)
|
||||
self.string = string
|
||||
self.index = 0
|
||||
self.__next()
|
||||
def __next(self):
|
||||
if self.index >= len(self.string):
|
||||
self.next = None
|
||||
return
|
||||
char = self.string[self.index:self.index+1]
|
||||
# Special case for the str8, since indexing returns a integer
|
||||
# XXX This is only needed for test_bug_926075 in test_re.py
|
||||
if char and not self.istext:
|
||||
char = chr(char[0])
|
||||
if char == "\\":
|
||||
try:
|
||||
c = self.string[self.index + 1]
|
||||
except IndexError:
|
||||
raise error("bogus escape (end of line)")
|
||||
if not self.istext:
|
||||
c = chr(c)
|
||||
char = char + c
|
||||
self.index = self.index + len(char)
|
||||
self.next = char
|
||||
def match(self, char, skip=1):
|
||||
if char == self.next:
|
||||
if skip:
|
||||
self.__next()
|
||||
return 1
|
||||
return 0
|
||||
def get(self):
|
||||
this = self.next
|
||||
self.__next()
|
||||
return this
|
||||
def getwhile(self, n, charset):
|
||||
result = ''
|
||||
for _ in range(n):
|
||||
c = self.next
|
||||
if c not in charset:
|
||||
break
|
||||
result += c
|
||||
self.__next()
|
||||
return result
|
||||
def tell(self):
|
||||
return self.index, self.next
|
||||
def seek(self, index):
|
||||
self.index, self.next = index
|
||||
|
||||
# The following three functions are not used in this module anymore, but we keep
|
||||
# them here (with DeprecationWarnings) for backwards compatibility.
|
||||
|
||||
def isident(char):
|
||||
import warnings
|
||||
warnings.warn('sre_parse.isident() will be removed in 3.5',
|
||||
DeprecationWarning, stacklevel=2)
|
||||
return "a" <= char <= "z" or "A" <= char <= "Z" or char == "_"
|
||||
|
||||
def isdigit(char):
|
||||
import warnings
|
||||
warnings.warn('sre_parse.isdigit() will be removed in 3.5',
|
||||
DeprecationWarning, stacklevel=2)
|
||||
return "0" <= char <= "9"
|
||||
|
||||
def isname(name):
|
||||
import warnings
|
||||
warnings.warn('sre_parse.isname() will be removed in 3.5',
|
||||
DeprecationWarning, stacklevel=2)
|
||||
# check that group name is a valid string
|
||||
if not isident(name[0]):
|
||||
return False
|
||||
for char in name[1:]:
|
||||
if not isident(char) and not isdigit(char):
|
||||
return False
|
||||
return True
|
||||
|
||||
def _class_escape(source, escape):
|
||||
# handle escape code inside character class
|
||||
code = ESCAPES.get(escape)
|
||||
if code:
|
||||
return code
|
||||
code = CATEGORIES.get(escape)
|
||||
if code and code[0] == IN:
|
||||
return code
|
||||
try:
|
||||
c = escape[1:2]
|
||||
if c == "x":
|
||||
# hexadecimal escape (exactly two digits)
|
||||
escape += source.getwhile(2, HEXDIGITS)
|
||||
if len(escape) != 4:
|
||||
raise ValueError
|
||||
return LITERAL, int(escape[2:], 16) & 0xff
|
||||
elif c == "u" and source.istext:
|
||||
# unicode escape (exactly four digits)
|
||||
escape += source.getwhile(4, HEXDIGITS)
|
||||
if len(escape) != 6:
|
||||
raise ValueError
|
||||
return LITERAL, int(escape[2:], 16)
|
||||
elif c == "U" and source.istext:
|
||||
# unicode escape (exactly eight digits)
|
||||
escape += source.getwhile(8, HEXDIGITS)
|
||||
if len(escape) != 10:
|
||||
raise ValueError
|
||||
c = int(escape[2:], 16)
|
||||
chr(c) # raise ValueError for invalid code
|
||||
return LITERAL, c
|
||||
elif c in OCTDIGITS:
|
||||
# octal escape (up to three digits)
|
||||
escape += source.getwhile(2, OCTDIGITS)
|
||||
return LITERAL, int(escape[1:], 8) & 0xff
|
||||
elif c in DIGITS:
|
||||
raise ValueError
|
||||
if len(escape) == 2:
|
||||
return LITERAL, ord(escape[1])
|
||||
except ValueError:
|
||||
pass
|
||||
raise error("bogus escape: %s" % repr(escape))
|
||||
|
||||
def _escape(source, escape, state):
|
||||
# handle escape code in expression
|
||||
code = CATEGORIES.get(escape)
|
||||
if code:
|
||||
return code
|
||||
code = ESCAPES.get(escape)
|
||||
if code:
|
||||
return code
|
||||
try:
|
||||
c = escape[1:2]
|
||||
if c == "x":
|
||||
# hexadecimal escape
|
||||
escape += source.getwhile(2, HEXDIGITS)
|
||||
if len(escape) != 4:
|
||||
raise ValueError
|
||||
return LITERAL, int(escape[2:], 16) & 0xff
|
||||
elif c == "u" and source.istext:
|
||||
# unicode escape (exactly four digits)
|
||||
escape += source.getwhile(4, HEXDIGITS)
|
||||
if len(escape) != 6:
|
||||
raise ValueError
|
||||
return LITERAL, int(escape[2:], 16)
|
||||
elif c == "U" and source.istext:
|
||||
# unicode escape (exactly eight digits)
|
||||
escape += source.getwhile(8, HEXDIGITS)
|
||||
if len(escape) != 10:
|
||||
raise ValueError
|
||||
c = int(escape[2:], 16)
|
||||
chr(c) # raise ValueError for invalid code
|
||||
return LITERAL, c
|
||||
elif c == "0":
|
||||
# octal escape
|
||||
escape += source.getwhile(2, OCTDIGITS)
|
||||
return LITERAL, int(escape[1:], 8) & 0xff
|
||||
elif c in DIGITS:
|
||||
# octal escape *or* decimal group reference (sigh)
|
||||
if source.next in DIGITS:
|
||||
escape = escape + source.get()
|
||||
if (escape[1] in OCTDIGITS and escape[2] in OCTDIGITS and
|
||||
source.next in OCTDIGITS):
|
||||
# got three octal digits; this is an octal escape
|
||||
escape = escape + source.get()
|
||||
return LITERAL, int(escape[1:], 8) & 0xff
|
||||
# not an octal escape, so this is a group reference
|
||||
group = int(escape[1:])
|
||||
if group < state.groups:
|
||||
if not state.checkgroup(group):
|
||||
raise error("cannot refer to open group")
|
||||
if state.lookbehind:
|
||||
import warnings
|
||||
warnings.warn('group references in lookbehind '
|
||||
'assertions are not supported',
|
||||
RuntimeWarning)
|
||||
return GROUPREF, group
|
||||
raise ValueError
|
||||
if len(escape) == 2:
|
||||
return LITERAL, ord(escape[1])
|
||||
except ValueError:
|
||||
pass
|
||||
raise error("bogus escape: %s" % repr(escape))
|
||||
|
||||
def _parse_sub(source, state, nested=1):
|
||||
# parse an alternation: a|b|c
|
||||
|
||||
items = []
|
||||
itemsappend = items.append
|
||||
sourcematch = source.match
|
||||
while 1:
|
||||
itemsappend(_parse(source, state))
|
||||
if sourcematch("|"):
|
||||
continue
|
||||
if not nested:
|
||||
break
|
||||
if not source.next or sourcematch(")", 0):
|
||||
break
|
||||
else:
|
||||
raise error("pattern not properly closed")
|
||||
|
||||
if len(items) == 1:
|
||||
return items[0]
|
||||
|
||||
subpattern = SubPattern(state)
|
||||
subpatternappend = subpattern.append
|
||||
|
||||
# check if all items share a common prefix
|
||||
while 1:
|
||||
prefix = None
|
||||
for item in items:
|
||||
if not item:
|
||||
break
|
||||
if prefix is None:
|
||||
prefix = item[0]
|
||||
elif item[0] != prefix:
|
||||
break
|
||||
else:
|
||||
# all subitems start with a common "prefix".
|
||||
# move it out of the branch
|
||||
for item in items:
|
||||
del item[0]
|
||||
subpatternappend(prefix)
|
||||
continue # check next one
|
||||
break
|
||||
|
||||
# check if the branch can be replaced by a character set
|
||||
for item in items:
|
||||
if len(item) != 1 or item[0][0] != LITERAL:
|
||||
break
|
||||
else:
|
||||
# we can store this as a character set instead of a
|
||||
# branch (the compiler may optimize this even more)
|
||||
set = []
|
||||
setappend = set.append
|
||||
for item in items:
|
||||
setappend(item[0])
|
||||
subpatternappend((IN, set))
|
||||
return subpattern
|
||||
|
||||
subpattern.append((BRANCH, (None, items)))
|
||||
return subpattern
|
||||
|
||||
def _parse_sub_cond(source, state, condgroup):
|
||||
item_yes = _parse(source, state)
|
||||
if source.match("|"):
|
||||
item_no = _parse(source, state)
|
||||
if source.match("|"):
|
||||
raise error("conditional backref with more than two branches")
|
||||
else:
|
||||
item_no = None
|
||||
if source.next and not source.match(")", 0):
|
||||
raise error("pattern not properly closed")
|
||||
subpattern = SubPattern(state)
|
||||
subpattern.append((GROUPREF_EXISTS, (condgroup, item_yes, item_no)))
|
||||
return subpattern
|
||||
|
||||
_PATTERNENDERS = set("|)")
|
||||
_ASSERTCHARS = set("=!<")
|
||||
_LOOKBEHINDASSERTCHARS = set("=!")
|
||||
_REPEATCODES = set([MIN_REPEAT, MAX_REPEAT])
|
||||
|
||||
def _parse(source, state):
|
||||
# parse a simple pattern
|
||||
subpattern = SubPattern(state)
|
||||
|
||||
# precompute constants into local variables
|
||||
subpatternappend = subpattern.append
|
||||
sourceget = source.get
|
||||
sourcematch = source.match
|
||||
_len = len
|
||||
PATTERNENDERS = _PATTERNENDERS
|
||||
ASSERTCHARS = _ASSERTCHARS
|
||||
LOOKBEHINDASSERTCHARS = _LOOKBEHINDASSERTCHARS
|
||||
REPEATCODES = _REPEATCODES
|
||||
|
||||
while 1:
|
||||
|
||||
if source.next in PATTERNENDERS:
|
||||
break # end of subpattern
|
||||
this = sourceget()
|
||||
if this is None:
|
||||
break # end of pattern
|
||||
|
||||
if state.flags & SRE_FLAG_VERBOSE:
|
||||
# skip whitespace and comments
|
||||
if this in WHITESPACE:
|
||||
continue
|
||||
if this == "#":
|
||||
while 1:
|
||||
this = sourceget()
|
||||
if this in (None, "\n"):
|
||||
break
|
||||
continue
|
||||
|
||||
if this and this[0] not in SPECIAL_CHARS:
|
||||
subpatternappend((LITERAL, ord(this)))
|
||||
|
||||
elif this == "[":
|
||||
# character set
|
||||
set = []
|
||||
setappend = set.append
|
||||
## if sourcematch(":"):
|
||||
## pass # handle character classes
|
||||
if sourcematch("^"):
|
||||
setappend((NEGATE, None))
|
||||
# check remaining characters
|
||||
start = set[:]
|
||||
while 1:
|
||||
this = sourceget()
|
||||
if this == "]" and set != start:
|
||||
break
|
||||
elif this and this[0] == "\\":
|
||||
code1 = _class_escape(source, this)
|
||||
elif this:
|
||||
code1 = LITERAL, ord(this)
|
||||
else:
|
||||
raise error("unexpected end of regular expression")
|
||||
if sourcematch("-"):
|
||||
# potential range
|
||||
this = sourceget()
|
||||
if this == "]":
|
||||
if code1[0] is IN:
|
||||
code1 = code1[1][0]
|
||||
setappend(code1)
|
||||
setappend((LITERAL, ord("-")))
|
||||
break
|
||||
elif this:
|
||||
if this[0] == "\\":
|
||||
code2 = _class_escape(source, this)
|
||||
else:
|
||||
code2 = LITERAL, ord(this)
|
||||
if code1[0] != LITERAL or code2[0] != LITERAL:
|
||||
raise error("bad character range")
|
||||
lo = code1[1]
|
||||
hi = code2[1]
|
||||
if hi < lo:
|
||||
raise error("bad character range")
|
||||
setappend((RANGE, (lo, hi)))
|
||||
else:
|
||||
raise error("unexpected end of regular expression")
|
||||
else:
|
||||
if code1[0] is IN:
|
||||
code1 = code1[1][0]
|
||||
setappend(code1)
|
||||
|
||||
# XXX: <fl> should move set optimization to compiler!
|
||||
if _len(set)==1 and set[0][0] is LITERAL:
|
||||
subpatternappend(set[0]) # optimization
|
||||
elif _len(set)==2 and set[0][0] is NEGATE and set[1][0] is LITERAL:
|
||||
subpatternappend((NOT_LITERAL, set[1][1])) # optimization
|
||||
else:
|
||||
# XXX: <fl> should add charmap optimization here
|
||||
subpatternappend((IN, set))
|
||||
|
||||
elif this and this[0] in REPEAT_CHARS:
|
||||
# repeat previous item
|
||||
if this == "?":
|
||||
min, max = 0, 1
|
||||
elif this == "*":
|
||||
min, max = 0, MAXREPEAT
|
||||
|
||||
elif this == "+":
|
||||
min, max = 1, MAXREPEAT
|
||||
elif this == "{":
|
||||
if source.next == "}":
|
||||
subpatternappend((LITERAL, ord(this)))
|
||||
continue
|
||||
here = source.tell()
|
||||
min, max = 0, MAXREPEAT
|
||||
lo = hi = ""
|
||||
while source.next in DIGITS:
|
||||
lo = lo + source.get()
|
||||
if sourcematch(","):
|
||||
while source.next in DIGITS:
|
||||
hi = hi + sourceget()
|
||||
else:
|
||||
hi = lo
|
||||
if not sourcematch("}"):
|
||||
subpatternappend((LITERAL, ord(this)))
|
||||
source.seek(here)
|
||||
continue
|
||||
if lo:
|
||||
min = int(lo)
|
||||
if min >= MAXREPEAT:
|
||||
raise OverflowError("the repetition number is too large")
|
||||
if hi:
|
||||
max = int(hi)
|
||||
if max >= MAXREPEAT:
|
||||
raise OverflowError("the repetition number is too large")
|
||||
if max < min:
|
||||
raise error("bad repeat interval")
|
||||
else:
|
||||
raise error("not supported")
|
||||
# figure out which item to repeat
|
||||
if subpattern:
|
||||
item = subpattern[-1:]
|
||||
else:
|
||||
item = None
|
||||
if not item or (_len(item) == 1 and item[0][0] == AT):
|
||||
raise error("nothing to repeat")
|
||||
if item[0][0] in REPEATCODES:
|
||||
raise error("multiple repeat")
|
||||
if sourcematch("?"):
|
||||
subpattern[-1] = (MIN_REPEAT, (min, max, item))
|
||||
else:
|
||||
subpattern[-1] = (MAX_REPEAT, (min, max, item))
|
||||
|
||||
elif this == ".":
|
||||
subpatternappend((ANY, None))
|
||||
|
||||
elif this == "(":
|
||||
group = 1
|
||||
name = None
|
||||
condgroup = None
|
||||
if sourcematch("?"):
|
||||
group = 0
|
||||
# options
|
||||
if sourcematch("P"):
|
||||
# python extensions
|
||||
if sourcematch("<"):
|
||||
# named group: skip forward to end of name
|
||||
name = ""
|
||||
while 1:
|
||||
char = sourceget()
|
||||
if char is None:
|
||||
raise error("unterminated name")
|
||||
if char == ">":
|
||||
break
|
||||
name = name + char
|
||||
group = 1
|
||||
if not name:
|
||||
raise error("missing group name")
|
||||
if not name.isidentifier():
|
||||
raise error("bad character in group name %r" % name)
|
||||
elif sourcematch("="):
|
||||
# named backreference
|
||||
name = ""
|
||||
while 1:
|
||||
char = sourceget()
|
||||
if char is None:
|
||||
raise error("unterminated name")
|
||||
if char == ")":
|
||||
break
|
||||
name = name + char
|
||||
if not name:
|
||||
raise error("missing group name")
|
||||
if not name.isidentifier():
|
||||
raise error("bad character in backref group name "
|
||||
"%r" % name)
|
||||
gid = state.groupdict.get(name)
|
||||
if gid is None:
|
||||
msg = "unknown group name: {0!r}".format(name)
|
||||
raise error(msg)
|
||||
if state.lookbehind:
|
||||
import warnings
|
||||
warnings.warn('group references in lookbehind '
|
||||
'assertions are not supported',
|
||||
RuntimeWarning)
|
||||
subpatternappend((GROUPREF, gid))
|
||||
continue
|
||||
else:
|
||||
char = sourceget()
|
||||
if char is None:
|
||||
raise error("unexpected end of pattern")
|
||||
raise error("unknown specifier: ?P%s" % char)
|
||||
elif sourcematch(":"):
|
||||
# non-capturing group
|
||||
group = 2
|
||||
elif sourcematch("#"):
|
||||
# comment
|
||||
while 1:
|
||||
if source.next is None or source.next == ")":
|
||||
break
|
||||
sourceget()
|
||||
if not sourcematch(")"):
|
||||
raise error("unbalanced parenthesis")
|
||||
continue
|
||||
elif source.next in ASSERTCHARS:
|
||||
# lookahead assertions
|
||||
char = sourceget()
|
||||
dir = 1
|
||||
if char == "<":
|
||||
if source.next not in LOOKBEHINDASSERTCHARS:
|
||||
raise error("syntax error")
|
||||
dir = -1 # lookbehind
|
||||
char = sourceget()
|
||||
state.lookbehind += 1
|
||||
p = _parse_sub(source, state)
|
||||
if dir < 0:
|
||||
state.lookbehind -= 1
|
||||
if not sourcematch(")"):
|
||||
raise error("unbalanced parenthesis")
|
||||
if char == "=":
|
||||
subpatternappend((ASSERT, (dir, p)))
|
||||
else:
|
||||
subpatternappend((ASSERT_NOT, (dir, p)))
|
||||
continue
|
||||
elif sourcematch("("):
|
||||
# conditional backreference group
|
||||
condname = ""
|
||||
while 1:
|
||||
char = sourceget()
|
||||
if char is None:
|
||||
raise error("unterminated name")
|
||||
if char == ")":
|
||||
break
|
||||
condname = condname + char
|
||||
group = 2
|
||||
if not condname:
|
||||
raise error("missing group name")
|
||||
if condname.isidentifier():
|
||||
condgroup = state.groupdict.get(condname)
|
||||
if condgroup is None:
|
||||
msg = "unknown group name: {0!r}".format(condname)
|
||||
raise error(msg)
|
||||
else:
|
||||
try:
|
||||
condgroup = int(condname)
|
||||
except ValueError:
|
||||
raise error("bad character in group name")
|
||||
if state.lookbehind:
|
||||
import warnings
|
||||
warnings.warn('group references in lookbehind '
|
||||
'assertions are not supported',
|
||||
RuntimeWarning)
|
||||
else:
|
||||
# flags
|
||||
if not source.next in FLAGS:
|
||||
raise error("unexpected end of pattern")
|
||||
while source.next in FLAGS:
|
||||
state.flags = state.flags | FLAGS[sourceget()]
|
||||
if group:
|
||||
# parse group contents
|
||||
if group == 2:
|
||||
# anonymous group
|
||||
group = None
|
||||
else:
|
||||
group = state.opengroup(name)
|
||||
if condgroup:
|
||||
p = _parse_sub_cond(source, state, condgroup)
|
||||
else:
|
||||
p = _parse_sub(source, state)
|
||||
if not sourcematch(")"):
|
||||
raise error("unbalanced parenthesis")
|
||||
if group is not None:
|
||||
state.closegroup(group)
|
||||
subpatternappend((SUBPATTERN, (group, p)))
|
||||
else:
|
||||
while 1:
|
||||
char = sourceget()
|
||||
if char is None:
|
||||
raise error("unexpected end of pattern")
|
||||
if char == ")":
|
||||
break
|
||||
raise error("unknown extension")
|
||||
|
||||
elif this == "^":
|
||||
subpatternappend((AT, AT_BEGINNING))
|
||||
|
||||
elif this == "$":
|
||||
subpattern.append((AT, AT_END))
|
||||
|
||||
elif this and this[0] == "\\":
|
||||
code = _escape(source, this, state)
|
||||
subpatternappend(code)
|
||||
|
||||
else:
|
||||
raise error("parser error")
|
||||
|
||||
return subpattern
|
||||
|
||||
def fix_flags(src, flags):
|
||||
# Check and fix flags according to the type of pattern (str or bytes)
|
||||
if isinstance(src, str):
|
||||
if not flags & SRE_FLAG_ASCII:
|
||||
flags |= SRE_FLAG_UNICODE
|
||||
elif flags & SRE_FLAG_UNICODE:
|
||||
raise ValueError("ASCII and UNICODE flags are incompatible")
|
||||
else:
|
||||
if flags & SRE_FLAG_UNICODE:
|
||||
raise ValueError("can't use UNICODE flag with a bytes pattern")
|
||||
return flags
|
||||
|
||||
def parse(str, flags=0, pattern=None):
|
||||
# parse 're' pattern into list of (opcode, argument) tuples
|
||||
|
||||
source = Tokenizer(str)
|
||||
|
||||
if pattern is None:
|
||||
pattern = Pattern()
|
||||
pattern.flags = flags
|
||||
pattern.str = str
|
||||
|
||||
p = _parse_sub(source, pattern, 0)
|
||||
p.pattern.flags = fix_flags(str, p.pattern.flags)
|
||||
|
||||
tail = source.get()
|
||||
if tail == ")":
|
||||
raise error("unbalanced parenthesis")
|
||||
elif tail:
|
||||
raise error("bogus characters at end of regular expression")
|
||||
|
||||
if flags & SRE_FLAG_DEBUG:
|
||||
p.dump()
|
||||
|
||||
if not (flags & SRE_FLAG_VERBOSE) and p.pattern.flags & SRE_FLAG_VERBOSE:
|
||||
# the VERBOSE flag was switched on inside the pattern. to be
|
||||
# on the safe side, we'll parse the whole thing again...
|
||||
return parse(str, p.pattern.flags)
|
||||
|
||||
return p
|
||||
|
||||
def parse_template(source, pattern):
|
||||
# parse 're' replacement string into list of literals and
|
||||
# group references
|
||||
s = Tokenizer(source)
|
||||
sget = s.get
|
||||
groups = []
|
||||
literals = []
|
||||
literal = []
|
||||
lappend = literal.append
|
||||
def addgroup(index):
|
||||
if literal:
|
||||
literals.append(''.join(literal))
|
||||
del literal[:]
|
||||
groups.append((len(literals), index))
|
||||
literals.append(None)
|
||||
while True:
|
||||
this = sget()
|
||||
if this is None:
|
||||
break # end of replacement string
|
||||
if this[0] == "\\":
|
||||
# group
|
||||
c = this[1]
|
||||
if c == "g":
|
||||
name = ""
|
||||
if s.match("<"):
|
||||
while True:
|
||||
char = sget()
|
||||
if char is None:
|
||||
raise error("unterminated group name")
|
||||
if char == ">":
|
||||
break
|
||||
name += char
|
||||
if not name:
|
||||
raise error("missing group name")
|
||||
try:
|
||||
index = int(name)
|
||||
if index < 0:
|
||||
raise error("negative group number")
|
||||
except ValueError:
|
||||
if not name.isidentifier():
|
||||
raise error("bad character in group name")
|
||||
try:
|
||||
index = pattern.groupindex[name]
|
||||
except KeyError:
|
||||
msg = "unknown group name: {0!r}".format(name)
|
||||
raise IndexError(msg)
|
||||
addgroup(index)
|
||||
elif c == "0":
|
||||
if s.next in OCTDIGITS:
|
||||
this += sget()
|
||||
if s.next in OCTDIGITS:
|
||||
this += sget()
|
||||
lappend(chr(int(this[1:], 8) & 0xff))
|
||||
elif c in DIGITS:
|
||||
isoctal = False
|
||||
if s.next in DIGITS:
|
||||
this += sget()
|
||||
if (c in OCTDIGITS and this[2] in OCTDIGITS and
|
||||
s.next in OCTDIGITS):
|
||||
this += sget()
|
||||
isoctal = True
|
||||
lappend(chr(int(this[1:], 8) & 0xff))
|
||||
if not isoctal:
|
||||
addgroup(int(this[1:]))
|
||||
else:
|
||||
try:
|
||||
this = chr(ESCAPES[this][1])
|
||||
except KeyError:
|
||||
pass
|
||||
lappend(this)
|
||||
else:
|
||||
lappend(this)
|
||||
if literal:
|
||||
literals.append(''.join(literal))
|
||||
if not isinstance(source, str):
|
||||
# The tokenizer implicitly decodes bytes objects as latin-1, we must
|
||||
# therefore re-encode the final representation.
|
||||
literals = [None if s is None else s.encode('latin-1') for s in literals]
|
||||
return groups, literals
|
||||
|
||||
def expand_template(template, match):
|
||||
g = match.group
|
||||
sep = match.string[:0]
|
||||
groups, literals = template
|
||||
literals = literals[:]
|
||||
try:
|
||||
for index, group in groups:
|
||||
literals[index] = s = g(group)
|
||||
if s is None:
|
||||
raise error("unmatched group")
|
||||
except IndexError:
|
||||
raise error("invalid group reference")
|
||||
return sep.join(literals)
|
||||
Reference in New Issue
Block a user