# find an array type code that matches the engine's code size
for WORDSIZE in "BHil":
if len(array.array(WORDSIZE, [0]).tostring()) == _sre.getcodesize():
- break
+ break
else:
raise RuntimeError, "cannot find a useable array type"
# internal: compile a (sub)pattern
emit = code.append
for op, av in pattern:
- if op is ANY:
- if flags & SRE_FLAG_DOTALL:
- emit(OPCODES[op])
- else:
- emit(OPCODES[CATEGORY])
- emit(CHCODES[CATEGORY_NOT_LINEBREAK])
- elif op in (SUCCESS, FAILURE):
- emit(OPCODES[op])
- elif op is AT:
- emit(OPCODES[op])
- if flags & SRE_FLAG_MULTILINE:
- emit(ATCODES[AT_MULTILINE[av]])
- else:
- emit(ATCODES[av])
- elif op is BRANCH:
- emit(OPCODES[op])
- tail = []
- for av in av[1]:
- skip = len(code); emit(0)
- _compile(code, av, flags)
- emit(OPCODES[JUMP])
- tail.append(len(code)); emit(0)
- code[skip] = len(code) - skip
- emit(0) # end of branch
- for tail in tail:
- code[tail] = len(code) - tail
- elif op is CALL:
- emit(OPCODES[op])
- skip = len(code); emit(0)
- _compile(code, av, flags)
- emit(OPCODES[SUCCESS])
- code[skip] = len(code) - skip
- elif op is CATEGORY:
- emit(OPCODES[op])
- if flags & SRE_FLAG_LOCALE:
- emit(CHCODES[CH_LOCALE[av]])
- elif flags & SRE_FLAG_UNICODE:
- emit(CHCODES[CH_UNICODE[av]])
- else:
- emit(CHCODES[av])
- elif op is GROUP:
- if flags & SRE_FLAG_IGNORECASE:
- emit(OPCODES[OP_IGNORE[op]])
- else:
- emit(OPCODES[op])
- emit(av-1)
- elif op is IN:
- if flags & SRE_FLAG_IGNORECASE:
- emit(OPCODES[OP_IGNORE[op]])
- def fixup(literal, flags=flags):
- return _sre.getlower(ord(literal), flags)
- else:
- emit(OPCODES[op])
- fixup = ord
- skip = len(code); emit(0)
- for op, av in av:
- emit(OPCODES[op])
- if op is NEGATE:
- pass
- elif op is LITERAL:
- emit(fixup(av))
- elif op is RANGE:
- emit(fixup(av[0]))
- emit(fixup(av[1]))
- elif op is CATEGORY:
- if flags & SRE_FLAG_LOCALE:
- emit(CHCODES[CH_LOCALE[av]])
- elif flags & SRE_FLAG_UNICODE:
- emit(CHCODES[CH_UNICODE[av]])
- else:
- emit(CHCODES[av])
- else:
- raise error, "internal: unsupported set operator"
- emit(OPCODES[FAILURE])
- code[skip] = len(code) - skip
- elif op in (LITERAL, NOT_LITERAL):
- if flags & SRE_FLAG_IGNORECASE:
- emit(OPCODES[OP_IGNORE[op]])
- else:
- emit(OPCODES[op])
- emit(ord(av))
- elif op is MARK:
- emit(OPCODES[op])
- emit(av)
- elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
- if flags & SRE_FLAG_TEMPLATE:
- emit(OPCODES[REPEAT])
- skip = len(code); emit(0)
- emit(av[0])
- emit(av[1])
- _compile(code, av[2], flags)
- emit(OPCODES[SUCCESS])
- code[skip] = len(code) - skip
- else:
- lo, hi = av[2].getwidth()
- if lo == 0:
- raise error, "nothing to repeat"
- if 0 and lo == hi == 1 and op is MAX_REPEAT:
- # FIXME: <fl> need a better way to figure out when
- # it's safe to use this one (in the parser, probably)
- emit(OPCODES[MAX_REPEAT_ONE])
- skip = len(code); emit(0)
- emit(av[0])
- emit(av[1])
- _compile(code, av[2], flags)
- emit(OPCODES[SUCCESS])
- code[skip] = len(code) - skip
- else:
- emit(OPCODES[op])
- skip = len(code); emit(0)
- emit(av[0])
- emit(av[1])
- _compile(code, av[2], flags)
- emit(OPCODES[SUCCESS])
- code[skip] = len(code) - skip
- elif op is SUBPATTERN:
- group = av[0]
- if group:
- emit(OPCODES[MARK])
- emit((group-1)*2)
- _compile(code, av[1], flags)
- if group:
- emit(OPCODES[MARK])
- emit((group-1)*2+1)
- else:
- raise ValueError, ("unsupported operand type", op)
+ if op is ANY:
+ if flags & SRE_FLAG_DOTALL:
+ emit(OPCODES[op])
+ else:
+ emit(OPCODES[CATEGORY])
+ emit(CHCODES[CATEGORY_NOT_LINEBREAK])
+ elif op in (SUCCESS, FAILURE):
+ emit(OPCODES[op])
+ elif op is AT:
+ emit(OPCODES[op])
+ if flags & SRE_FLAG_MULTILINE:
+ emit(ATCODES[AT_MULTILINE[av]])
+ else:
+ emit(ATCODES[av])
+ elif op is BRANCH:
+ emit(OPCODES[op])
+ tail = []
+ for av in av[1]:
+ skip = len(code); emit(0)
+ _compile(code, av, flags)
+ emit(OPCODES[JUMP])
+ tail.append(len(code)); emit(0)
+ code[skip] = len(code) - skip
+ emit(0) # end of branch
+ for tail in tail:
+ code[tail] = len(code) - tail
+ elif op is CALL:
+ emit(OPCODES[op])
+ skip = len(code); emit(0)
+ _compile(code, av, flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = len(code) - skip
+ elif op is CATEGORY:
+ emit(OPCODES[op])
+ if flags & SRE_FLAG_LOCALE:
+ emit(CHCODES[CH_LOCALE[av]])
+ elif flags & SRE_FLAG_UNICODE:
+ emit(CHCODES[CH_UNICODE[av]])
+ else:
+ emit(CHCODES[av])
+ elif op is GROUP:
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ else:
+ emit(OPCODES[op])
+ emit(av-1)
+ elif op is IN:
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ def fixup(literal, flags=flags):
+ return _sre.getlower(ord(literal), flags)
+ else:
+ emit(OPCODES[op])
+ fixup = ord
+ skip = len(code); emit(0)
+ for op, av in av:
+ emit(OPCODES[op])
+ if op is NEGATE:
+ pass
+ elif op is LITERAL:
+ emit(fixup(av))
+ elif op is RANGE:
+ emit(fixup(av[0]))
+ emit(fixup(av[1]))
+ elif op is CATEGORY:
+ if flags & SRE_FLAG_LOCALE:
+ emit(CHCODES[CH_LOCALE[av]])
+ elif flags & SRE_FLAG_UNICODE:
+ emit(CHCODES[CH_UNICODE[av]])
+ else:
+ emit(CHCODES[av])
+ else:
+ raise error, "internal: unsupported set operator"
+ emit(OPCODES[FAILURE])
+ code[skip] = len(code) - skip
+ elif op in (LITERAL, NOT_LITERAL):
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ else:
+ emit(OPCODES[op])
+ emit(ord(av))
+ elif op is MARK:
+ emit(OPCODES[op])
+ emit(av)
+ elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
+ if flags & SRE_FLAG_TEMPLATE:
+ emit(OPCODES[REPEAT])
+ skip = len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = len(code) - skip
+ else:
+ lo, hi = av[2].getwidth()
+ if lo == 0:
+ raise error, "nothing to repeat"
+ if 0 and lo == hi == 1 and op is MAX_REPEAT:
+ # FIXME: <fl> need a better way to figure out when
+ # it's safe to use this one (in the parser, probably)
+ emit(OPCODES[MAX_REPEAT_ONE])
+ skip = len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = len(code) - skip
+ else:
+ emit(OPCODES[op])
+ skip = len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = len(code) - skip
+ elif op is SUBPATTERN:
+ group = av[0]
+ if group:
+ emit(OPCODES[MARK])
+ emit((group-1)*2)
+ _compile(code, av[1], flags)
+ if group:
+ emit(OPCODES[MARK])
+ emit((group-1)*2+1)
+ else:
+ raise ValueError, ("unsupported operand type", op)
def _compile_info(code, pattern, flags):
# internal: compile an info block. in the current version,
# if any
lo, hi = pattern.getwidth()
if lo == 0:
- return # not worth it
+ return # not worth it
# look for a literal prefix
prefix = []
if not (flags & SRE_FLAG_IGNORECASE):
- for op, av in pattern.data:
- if op is LITERAL:
- prefix.append(ord(av))
- else:
- break
+ for op, av in pattern.data:
+ if op is LITERAL:
+ prefix.append(ord(av))
+ else:
+ break
# add an info block
emit = code.append
emit(OPCODES[INFO])
# literal flag
mask = 0
if len(prefix) == len(pattern.data):
- mask = 1
+ mask = 1
emit(mask)
# pattern length
emit(lo)
if hi < 32768:
- emit(hi)
+ emit(hi)
else:
- emit(0)
+ emit(0)
# add literal prefix
emit(len(prefix))
if prefix:
- code.extend(prefix)
- # generate overlap table
- table = [-1] + ([0]*len(prefix))
- for i in range(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
+ code.extend(prefix)
+ # generate overlap table
+ table = [-1] + ([0]*len(prefix))
+ for i in range(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
code[skip] = len(code) - skip
def compile(p, flags=0):
# compile, as necessary
if type(p) in (type(""), type(u"")):
- import sre_parse
- pattern = p
- p = sre_parse.parse(p)
+ import sre_parse
+ pattern = p
+ p = sre_parse.parse(p)
else:
- pattern = None
+ pattern = None
flags = p.pattern.flags | flags
code = []
# FIXME: <fl> get rid of this limitation!
assert p.pattern.groups <= 100,\
- "sorry, but this version only supports 100 named groups"
+ "sorry, but this version only supports 100 named groups"
return _sre.compile(
- pattern, flags,
- array.array(WORDSIZE, code).tostring(),
- p.pattern.groups-1, p.pattern.groupdict
- )
+ pattern, flags,
+ array.array(WORDSIZE, code).tostring(),
+ p.pattern.groups-1, p.pattern.groupdict
+ )
class State:
def __init__(self):
- self.flags = 0
- self.groups = 1
- self.groupdict = {}
+ self.flags = 0
+ self.groups = 1
+ self.groupdict = {}
def getgroup(self, name=None):
- gid = self.groups
- self.groups = gid + 1
- if name:
- self.groupdict[name] = gid
- return gid
+ gid = self.groups
+ self.groups = gid + 1
+ if name:
+ self.groupdict[name] = gid
+ return gid
class SubPattern:
# a subpattern, in intermediate form
def __init__(self, pattern, data=None):
- self.pattern = pattern
- if not data:
- data = []
- self.data = data
- self.width = None
+ self.pattern = pattern
+ if not data:
+ data = []
+ self.data = data
+ self.width = None
def __repr__(self):
- return repr(self.data)
+ return repr(self.data)
def __len__(self):
- return len(self.data)
+ return len(self.data)
def __delitem__(self, index):
- del self.data[index]
+ del self.data[index]
def __getitem__(self, index):
- return self.data[index]
+ return self.data[index]
def __setitem__(self, index, code):
- self.data[index] = code
+ self.data[index] = code
def __getslice__(self, start, stop):
- return SubPattern(self.pattern, self.data[start:stop])
+ return SubPattern(self.pattern, self.data[start:stop])
def insert(self, index, code):
- self.data.insert(index, code)
+ self.data.insert(index, code)
def append(self, code):
- self.data.append(code)
+ self.data.append(code)
def getwidth(self):
- # determine the width (min, max) for this subpattern
- if self.width:
- return self.width
- lo = hi = 0L
- for op, av in self.data:
- if op is BRANCH:
- l = sys.maxint
- h = 0
- for av in av[1]:
- i, j = av.getwidth()
- l = min(l, i)
- h = min(h, j)
- 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 (MIN_REPEAT, MAX_REPEAT):
- i, j = av[2].getwidth()
- lo = lo + long(i) * av[0]
- hi = hi + long(j) * av[1]
- elif op in (ANY, RANGE, IN, LITERAL, NOT_LITERAL, CATEGORY):
- lo = lo + 1
- hi = hi + 1
- elif op == SUCCESS:
- break
- self.width = int(min(lo, sys.maxint)), int(min(hi, sys.maxint))
- return self.width
+ # determine the width (min, max) for this subpattern
+ if self.width:
+ return self.width
+ lo = hi = 0L
+ for op, av in self.data:
+ if op is BRANCH:
+ l = sys.maxint
+ h = 0
+ for av in av[1]:
+ i, j = av.getwidth()
+ l = min(l, i)
+ h = min(h, j)
+ 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 (MIN_REPEAT, MAX_REPEAT):
+ i, j = av[2].getwidth()
+ lo = lo + long(i) * av[0]
+ hi = hi + long(j) * av[1]
+ elif op in (ANY, RANGE, IN, LITERAL, NOT_LITERAL, CATEGORY):
+ lo = lo + 1
+ hi = hi + 1
+ elif op == SUCCESS:
+ break
+ self.width = int(min(lo, sys.maxint)), int(min(hi, sys.maxint))
+ return self.width
class Tokenizer:
def __init__(self, string):
- self.index = 0
- self.string = string
- self.next = self.__next()
+ self.index = 0
+ self.string = string
+ self.next = self.__next()
def __next(self):
- if self.index >= len(self.string):
- return None
- char = self.string[self.index]
- if char[0] == "\\":
- try:
- c = self.string[self.index + 1]
- except IndexError:
- raise error, "bogus escape"
- char = char + c
- self.index = self.index + len(char)
- return char
+ if self.index >= len(self.string):
+ return None
+ char = self.string[self.index]
+ if char[0] == "\\":
+ try:
+ c = self.string[self.index + 1]
+ except IndexError:
+ raise error, "bogus escape"
+ char = char + c
+ self.index = self.index + len(char)
+ return char
def match(self, char):
- if char == self.next:
- self.next = self.__next()
- return 1
- return 0
+ if char == self.next:
+ self.next = self.__next()
+ return 1
+ return 0
def match_set(self, set):
- if self.next and self.next in set:
- self.next = self.__next()
- return 1
- return 0
+ if self.next and self.next in set:
+ self.next = self.__next()
+ return 1
+ return 0
def get(self):
- this = self.next
- self.next = self.__next()
- return this
+ this = self.next
+ self.next = self.__next()
+ return this
def isident(char):
return "a" <= char <= "z" or "A" <= char <= "Z" or char == "_"
# expression instead, but I seem to have certain bootstrapping
# problems here ;-)
if not isident(name[0]):
- return 0
+ return 0
for char in name:
- if not isident(char) and not isdigit(char):
- return 0
+ if not isident(char) and not isdigit(char):
+ return 0
return 1
def _group(escape, groups):
# check if the escape string represents a valid group
try:
- group = int(escape[1:])
- if group and group < groups:
- return group
+ group = int(escape[1:])
+ if group and group < groups:
+ return group
except ValueError:
- pass
+ pass
return None # not a valid group
def _class_escape(source, escape):
# handle escape code inside character class
code = ESCAPES.get(escape)
if code:
- return code
+ return code
code = CATEGORIES.get(escape)
if code:
- return code
+ return code
try:
- if escape[1:2] == "x":
- while source.next in HEXDIGITS:
- escape = escape + source.get()
- escape = escape[2:]
- # FIXME: support unicode characters!
- return LITERAL, chr(int(escape[-4:], 16) & 0xff)
- elif str(escape[1:2]) in OCTDIGITS:
- while source.next in OCTDIGITS:
- escape = escape + source.get()
- escape = escape[1:]
- # FIXME: support unicode characters!
- return LITERAL, chr(int(escape[-6:], 8) & 0xff)
- if len(escape) == 2:
- return LITERAL, escape[1]
+ if escape[1:2] == "x":
+ while source.next in HEXDIGITS:
+ escape = escape + source.get()
+ escape = escape[2:]
+ # FIXME: support unicode characters!
+ return LITERAL, chr(int(escape[-4:], 16) & 0xff)
+ elif str(escape[1:2]) in OCTDIGITS:
+ while source.next in OCTDIGITS:
+ escape = escape + source.get()
+ escape = escape[1:]
+ # FIXME: support unicode characters!
+ return LITERAL, chr(int(escape[-6:], 8) & 0xff)
+ if len(escape) == 2:
+ return LITERAL, escape[1]
except ValueError:
- pass
+ 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
+ return code
code = ESCAPES.get(escape)
if code:
- return code
+ return code
try:
- if escape[1:2] == "x":
- while source.next in HEXDIGITS:
- escape = escape + source.get()
- escape = escape[2:]
- # FIXME: support unicode characters!
- return LITERAL, chr(int(escape[-4:], 16) & 0xff)
- elif escape[1:2] in DIGITS:
- while 1:
- group = _group(escape, state.groups)
- if group:
- if (not source.next or
- not _group(escape + source.next, state.groups)):
- return GROUP, group
- escape = escape + source.get()
- elif source.next in OCTDIGITS:
- escape = escape + source.get()
- else:
- break
- escape = escape[1:]
- # FIXME: support unicode characters!
- return LITERAL, chr(int(escape[-6:], 8) & 0xff)
- if len(escape) == 2:
- return LITERAL, escape[1]
+ if escape[1:2] == "x":
+ while source.next in HEXDIGITS:
+ escape = escape + source.get()
+ escape = escape[2:]
+ # FIXME: support unicode characters!
+ return LITERAL, chr(int(escape[-4:], 16) & 0xff)
+ elif escape[1:2] in DIGITS:
+ while 1:
+ group = _group(escape, state.groups)
+ if group:
+ if (not source.next or
+ not _group(escape + source.next, state.groups)):
+ return GROUP, group
+ escape = escape + source.get()
+ elif source.next in OCTDIGITS:
+ escape = escape + source.get()
+ else:
+ break
+ escape = escape[1:]
+ # FIXME: support unicode characters!
+ return LITERAL, chr(int(escape[-6:], 8) & 0xff)
+ if len(escape) == 2:
+ return LITERAL, escape[1]
except ValueError:
- pass
+ pass
raise error, "bogus escape: %s" % repr(escape)
# 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]
- subpattern.append(prefix)
- continue # check next one
- break
+ 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]
+ subpattern.append(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
+ if len(item) != 1 or item[0][0] != LITERAL:
+ break
else:
- # we can store this as a character set instead of a
- # branch (FIXME: use a range if possible)
- set = []
- for item in items:
- set.append(item[0])
- subpattern.append((IN, set))
- return subpattern
+ # we can store this as a character set instead of a
+ # branch (FIXME: use a range if possible)
+ set = []
+ for item in items:
+ set.append(item[0])
+ subpattern.append((IN, set))
+ return subpattern
subpattern.append((BRANCH, (None, items)))
return subpattern
while 1:
- if source.next in ("|", ")"):
- break # end of subpattern
- this = source.get()
- 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 = source.get()
- if this in (None, "\n"):
- break
- continue
-
- if this and this[0] not in SPECIAL_CHARS:
- subpattern.append((LITERAL, this))
-
- elif this == "[":
- # character set
- set = []
-## if source.match(":"):
-## pass # handle character classes
- if source.match("^"):
- set.append((NEGATE, None))
- # check remaining characters
- start = set[:]
- while 1:
- this = source.get()
- if this == "]" and set != start:
- break
- elif this and this[0] == "\\":
- code1 = _class_escape(source, this)
- elif this:
- code1 = LITERAL, this
- else:
- raise error, "unexpected end of regular expression"
- if source.match("-"):
- # potential range
- this = source.get()
- if this == "]":
- set.append(code1)
- set.append((LITERAL, "-"))
- break
- else:
- if this[0] == "\\":
- code2 = _class_escape(source, this)
- else:
- code2 = LITERAL, this
- if code1[0] != LITERAL or code2[0] != LITERAL:
- raise error, "illegal range"
- if len(code1[1]) != 1 or len(code2[1]) != 1:
- raise error, "illegal range"
- set.append((RANGE, (code1[1], code2[1])))
- else:
- if code1[0] is IN:
- code1 = code1[1][0]
- set.append(code1)
-
- # FIXME: <fl> move set optimization to compiler!
- if len(set)==1 and set[0][0] is LITERAL:
- subpattern.append(set[0]) # optimization
- elif len(set)==2 and set[0][0] is NEGATE and set[1][0] is LITERAL:
- subpattern.append((NOT_LITERAL, set[1][1])) # optimization
- else:
- # FIXME: <fl> add charmap optimization
- subpattern.append((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 == "{":
- min, max = 0, MAXREPEAT
- lo = hi = ""
- while source.next in DIGITS:
- lo = lo + source.get()
- if source.match(","):
- while source.next in DIGITS:
- hi = hi + source.get()
- else:
- hi = lo
- if not source.match("}"):
- raise error, "bogus range"
- if lo:
- min = int(lo)
- if hi:
- max = int(hi)
- # FIXME: <fl> check that hi >= lo!
- else:
- raise error, "not supported"
- # figure out which item to repeat
- if subpattern:
- item = subpattern[-1:]
- else:
- raise error, "nothing to repeat"
- if source.match("?"):
- subpattern[-1] = (MIN_REPEAT, (min, max, item))
- else:
- subpattern[-1] = (MAX_REPEAT, (min, max, item))
-
- elif this == ".":
- subpattern.append((ANY, None))
-
- elif this == "(":
- group = 1
- name = None
- if source.match("?"):
- group = 0
- # options
- if source.match("P"):
- # python extensions
- if source.match("<"):
- # named group: skip forward to end of name
- name = ""
- while 1:
- char = source.get()
- if char is None:
- raise error, "unterminated name"
- if char == ">":
- break
- name = name + char
- group = 1
- if not isname(name):
- raise error, "illegal character in group name"
- elif source.match("="):
- # named backreference
- raise error, "not yet implemented"
- else:
- char = source.get()
- if char is None:
- raise error, "unexpected end of pattern"
- raise error, "unknown specifier: ?P%s" % char
- elif source.match(":"):
- # non-capturing group
- group = 2
- elif source.match("#"):
- # comment
- while 1:
- if source.next is None or source.next == ")":
- break
- source.get()
- else:
- # flags
- while FLAGS.has_key(source.next):
- state.flags = state.flags | FLAGS[source.get()]
- if group:
- # parse group contents
- b = []
- if group == 2:
- # anonymous group
- group = None
- else:
- group = state.getgroup(name)
- while 1:
- p = _parse(source, state, flags)
- if source.match(")"):
- if b:
- b.append(p)
- p = _branch(state, b)
- subpattern.append((SUBPATTERN, (group, p)))
- break
- elif source.match("|"):
- b.append(p)
- else:
- raise error, "group not properly closed"
- else:
- while 1:
- char = source.get()
- if char is None or char == ")":
- break
- raise error, "unknown extension"
-
- elif this == "^":
- subpattern.append((AT, AT_BEGINNING))
-
- elif this == "$":
- subpattern.append((AT, AT_END))
-
- elif this and this[0] == "\\":
- code = _escape(source, this, state)
- subpattern.append(code)
-
- else:
- raise error, "parser error"
+ if source.next in ("|", ")"):
+ break # end of subpattern
+ this = source.get()
+ 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 = source.get()
+ if this in (None, "\n"):
+ break
+ continue
+
+ if this and this[0] not in SPECIAL_CHARS:
+ subpattern.append((LITERAL, this))
+
+ elif this == "[":
+ # character set
+ set = []
+## if source.match(":"):
+## pass # handle character classes
+ if source.match("^"):
+ set.append((NEGATE, None))
+ # check remaining characters
+ start = set[:]
+ while 1:
+ this = source.get()
+ if this == "]" and set != start:
+ break
+ elif this and this[0] == "\\":
+ code1 = _class_escape(source, this)
+ elif this:
+ code1 = LITERAL, this
+ else:
+ raise error, "unexpected end of regular expression"
+ if source.match("-"):
+ # potential range
+ this = source.get()
+ if this == "]":
+ set.append(code1)
+ set.append((LITERAL, "-"))
+ break
+ else:
+ if this[0] == "\\":
+ code2 = _class_escape(source, this)
+ else:
+ code2 = LITERAL, this
+ if code1[0] != LITERAL or code2[0] != LITERAL:
+ raise error, "illegal range"
+ if len(code1[1]) != 1 or len(code2[1]) != 1:
+ raise error, "illegal range"
+ set.append((RANGE, (code1[1], code2[1])))
+ else:
+ if code1[0] is IN:
+ code1 = code1[1][0]
+ set.append(code1)
+
+ # FIXME: <fl> move set optimization to compiler!
+ if len(set)==1 and set[0][0] is LITERAL:
+ subpattern.append(set[0]) # optimization
+ elif len(set)==2 and set[0][0] is NEGATE and set[1][0] is LITERAL:
+ subpattern.append((NOT_LITERAL, set[1][1])) # optimization
+ else:
+ # FIXME: <fl> add charmap optimization
+ subpattern.append((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 == "{":
+ min, max = 0, MAXREPEAT
+ lo = hi = ""
+ while source.next in DIGITS:
+ lo = lo + source.get()
+ if source.match(","):
+ while source.next in DIGITS:
+ hi = hi + source.get()
+ else:
+ hi = lo
+ if not source.match("}"):
+ raise error, "bogus range"
+ if lo:
+ min = int(lo)
+ if hi:
+ max = int(hi)
+ # FIXME: <fl> check that hi >= lo!
+ else:
+ raise error, "not supported"
+ # figure out which item to repeat
+ if subpattern:
+ item = subpattern[-1:]
+ else:
+ raise error, "nothing to repeat"
+ if source.match("?"):
+ subpattern[-1] = (MIN_REPEAT, (min, max, item))
+ else:
+ subpattern[-1] = (MAX_REPEAT, (min, max, item))
+
+ elif this == ".":
+ subpattern.append((ANY, None))
+
+ elif this == "(":
+ group = 1
+ name = None
+ if source.match("?"):
+ group = 0
+ # options
+ if source.match("P"):
+ # python extensions
+ if source.match("<"):
+ # named group: skip forward to end of name
+ name = ""
+ while 1:
+ char = source.get()
+ if char is None:
+ raise error, "unterminated name"
+ if char == ">":
+ break
+ name = name + char
+ group = 1
+ if not isname(name):
+ raise error, "illegal character in group name"
+ elif source.match("="):
+ # named backreference
+ raise error, "not yet implemented"
+ else:
+ char = source.get()
+ if char is None:
+ raise error, "unexpected end of pattern"
+ raise error, "unknown specifier: ?P%s" % char
+ elif source.match(":"):
+ # non-capturing group
+ group = 2
+ elif source.match("#"):
+ # comment
+ while 1:
+ if source.next is None or source.next == ")":
+ break
+ source.get()
+ else:
+ # flags
+ while FLAGS.has_key(source.next):
+ state.flags = state.flags | FLAGS[source.get()]
+ if group:
+ # parse group contents
+ b = []
+ if group == 2:
+ # anonymous group
+ group = None
+ else:
+ group = state.getgroup(name)
+ while 1:
+ p = _parse(source, state, flags)
+ if source.match(")"):
+ if b:
+ b.append(p)
+ p = _branch(state, b)
+ subpattern.append((SUBPATTERN, (group, p)))
+ break
+ elif source.match("|"):
+ b.append(p)
+ else:
+ raise error, "group not properly closed"
+ else:
+ while 1:
+ char = source.get()
+ if char is None or char == ")":
+ break
+ raise error, "unknown extension"
+
+ elif this == "^":
+ subpattern.append((AT, AT_BEGINNING))
+
+ elif this == "$":
+ subpattern.append((AT, AT_END))
+
+ elif this and this[0] == "\\":
+ code = _escape(source, this, state)
+ subpattern.append(code)
+
+ else:
+ raise error, "parser error"
return subpattern
state = State()
b = []
while 1:
- p = _parse(source, state, flags)
- tail = source.get()
- if tail == "|":
- b.append(p)
- elif tail == ")":
- raise error, "unbalanced parenthesis"
- elif tail is None:
- if b:
- b.append(p)
- p = _branch(state, b)
- break
- else:
- raise error, "bogus characters at end of regular expression"
+ p = _parse(source, state, flags)
+ tail = source.get()
+ if tail == "|":
+ b.append(p)
+ elif tail == ")":
+ raise error, "unbalanced parenthesis"
+ elif tail is None:
+ if b:
+ b.append(p)
+ p = _branch(state, b)
+ break
+ else:
+ raise error, "bogus characters at end of regular expression"
return p
def parse_template(source, pattern):
p = []
a = p.append
while 1:
- this = s.get()
- if this is None:
- break # end of replacement string
- if this and this[0] == "\\":
- # group
- if this == "\\g":
- name = ""
- if s.match("<"):
- while 1:
- char = s.get()
- if char is None:
- raise error, "unterminated group name"
- if char == ">":
- break
- name = name + char
- if not name:
- raise error, "bad group name"
- try:
- index = int(name)
- except ValueError:
- if not isname(name):
- raise error, "illegal character in group name"
- try:
- index = pattern.groupindex[name]
- except KeyError:
- raise IndexError, "unknown group name"
- a((MARK, index))
- elif len(this) > 1 and this[1] in DIGITS:
- code = None
- while 1:
- group = _group(this, pattern.groups+1)
- if group:
- if (not s.next or
- not _group(this + s.next, pattern.groups+1)):
- code = MARK, int(group)
- break
- elif s.next in OCTDIGITS:
- this = this + s.get()
- else:
- break
- if not code:
- this = this[1:]
- # FIXME: support unicode characters!
- code = LITERAL, chr(int(this[-6:], 8) & 0xff)
- a(code)
- else:
- try:
- a(ESCAPES[this])
- except KeyError:
- for c in this:
- a((LITERAL, c))
- else:
- a((LITERAL, this))
+ this = s.get()
+ if this is None:
+ break # end of replacement string
+ if this and this[0] == "\\":
+ # group
+ if this == "\\g":
+ name = ""
+ if s.match("<"):
+ while 1:
+ char = s.get()
+ if char is None:
+ raise error, "unterminated group name"
+ if char == ">":
+ break
+ name = name + char
+ if not name:
+ raise error, "bad group name"
+ try:
+ index = int(name)
+ except ValueError:
+ if not isname(name):
+ raise error, "illegal character in group name"
+ try:
+ index = pattern.groupindex[name]
+ except KeyError:
+ raise IndexError, "unknown group name"
+ a((MARK, index))
+ elif len(this) > 1 and this[1] in DIGITS:
+ code = None
+ while 1:
+ group = _group(this, pattern.groups+1)
+ if group:
+ if (not s.next or
+ not _group(this + s.next, pattern.groups+1)):
+ code = MARK, int(group)
+ break
+ elif s.next in OCTDIGITS:
+ this = this + s.get()
+ else:
+ break
+ if not code:
+ this = this[1:]
+ # FIXME: support unicode characters!
+ code = LITERAL, chr(int(this[-6:], 8) & 0xff)
+ a(code)
+ else:
+ try:
+ a(ESCAPES[this])
+ except KeyError:
+ for c in this:
+ a((LITERAL, c))
+ else:
+ a((LITERAL, this))
return p
def expand_template(template, match):
p = []
a = p.append
for c, s in template:
- if c is LITERAL:
- a(s)
- elif c is MARK:
- s = match.group(s)
- if s is None:
- raise error, "empty group"
- a(s)
+ if c is LITERAL:
+ a(s)
+ elif c is MARK:
+ s = match.group(s)
+ if s is None:
+ raise error, "empty group"
+ a(s)
return match.string[:0].join(p)
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