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import re
import sys
from types import CodeType
from types import TracebackType
try:
from __pypy__ import tproxy
except ImportError:
tproxy = None
try:
from .cpython import tb_set_next
except ImportError:
tb_set_next = None
if not tb_set_next and not tproxy:
raise ImportError("Cannot use tblib. Runtime not supported.")
__version__ = '1.4.0'
__all__ = 'Traceback',
PY3 = sys.version_info[0] == 3
FRAME_RE = re.compile(r'^\s*File "(?P<co_filename>.+)", line (?P<tb_lineno>\d+)(, in (?P<co_name>.+))?$')
class _AttrDict(dict):
__slots__ = ()
__getattr__ = dict.__getitem__
# noinspection PyPep8Naming
class __traceback_maker(Exception):
pass
class TracebackParseError(Exception):
pass
class Code(object):
co_code = None
def __init__(self, code):
self.co_filename = code.co_filename
self.co_name = code.co_name
class Frame(object):
def __init__(self, frame):
self.f_globals = {
k: v
for k, v in frame.f_globals.items()
if k in ("__file__", "__name__")
}
self.f_code = Code(frame.f_code)
def clear(self):
# For compatibility with PyPy 3.5;
# clear() was added to frame in Python 3.4
# and is called by traceback.clear_frames(), which
# in turn is called by unittest.TestCase.assertRaises
pass
class Traceback(object):
tb_next = None
def __init__(self, tb):
self.tb_frame = Frame(tb.tb_frame)
# noinspection SpellCheckingInspection
self.tb_lineno = int(tb.tb_lineno)
# Build in place to avoid exceeding the recursion limit
tb = tb.tb_next
prev_traceback = self
cls = type(self)
while tb is not None:
traceback = object.__new__(cls)
traceback.tb_frame = Frame(tb.tb_frame)
traceback.tb_lineno = int(tb.tb_lineno)
prev_traceback.tb_next = traceback
prev_traceback = traceback
tb = tb.tb_next
def as_traceback(self):
if tproxy:
return tproxy(TracebackType, self.__tproxy_handler)
if not tb_set_next:
raise RuntimeError("Unsupported Python interpreter!")
current = self
top_tb = None
tb = None
while current:
f_code = current.tb_frame.f_code
code = compile('\n' * (current.tb_lineno - 1) + 'raise __traceback_maker', current.tb_frame.f_code.co_filename, 'exec')
if PY3:
code = CodeType(
0, code.co_kwonlyargcount,
code.co_nlocals, code.co_stacksize, code.co_flags,
code.co_code, code.co_consts, code.co_names, code.co_varnames,
f_code.co_filename, f_code.co_name,
code.co_firstlineno, code.co_lnotab, (), ()
)
else:
code = CodeType(
0,
code.co_nlocals, code.co_stacksize, code.co_flags,
code.co_code, code.co_consts, code.co_names, code.co_varnames,
f_code.co_filename.encode(), f_code.co_name.encode(),
code.co_firstlineno, code.co_lnotab, (), ()
)
# noinspection PyBroadException
try:
exec(code, current.tb_frame.f_globals, {})
except Exception:
next_tb = sys.exc_info()[2].tb_next
if top_tb is None:
top_tb = next_tb
if tb is not None:
tb_set_next(tb, next_tb)
tb = next_tb
del next_tb
current = current.tb_next
try:
return top_tb
finally:
del top_tb
del tb
# noinspection SpellCheckingInspection
def __tproxy_handler(self, operation, *args, **kwargs):
if operation in ('__getattribute__', '__getattr__'):
if args[0] == 'tb_next':
return self.tb_next and self.tb_next.as_traceback()
else:
return getattr(self, args[0])
else:
return getattr(self, operation)(*args, **kwargs)
def to_dict(self):
"""Convert a Traceback into a dictionary representation"""
if self.tb_next is None:
tb_next = None
else:
tb_next = self.tb_next.to_dict()
code = {
'co_filename': self.tb_frame.f_code.co_filename,
'co_name': self.tb_frame.f_code.co_name,
}
frame = {
'f_globals': self.tb_frame.f_globals,
'f_code': code,
}
return {
'tb_frame': frame,
'tb_lineno': self.tb_lineno,
'tb_next': tb_next,
}
@classmethod
def from_dict(cls, dct):
if dct['tb_next']:
tb_next = cls.from_dict(dct['tb_next'])
else:
tb_next = None
code = _AttrDict(
co_filename=dct['tb_frame']['f_code']['co_filename'],
co_name=dct['tb_frame']['f_code']['co_name'],
)
frame = _AttrDict(
f_globals=dct['tb_frame']['f_globals'],
f_code=code,
)
tb = _AttrDict(
tb_frame=frame,
tb_lineno=dct['tb_lineno'],
tb_next=tb_next,
)
return cls(tb)
@classmethod
def from_string(cls, string, strict=True):
frames = []
header = strict
for line in string.splitlines():
line = line.rstrip()
if header:
if line == 'Traceback (most recent call last):':
header = False
continue
frame_match = FRAME_RE.match(line)
if frame_match:
frames.append(frame_match.groupdict())
elif line.startswith(' '):
pass
elif strict:
break # traceback ended
if frames:
previous = None
for frame in reversed(frames):
previous = _AttrDict(
frame,
tb_frame=_AttrDict(
frame,
f_globals=_AttrDict(
__file__=frame['co_filename'],
__name__='?',
),
f_code=_AttrDict(frame),
),
tb_next=previous,
)
return cls(previous)
else:
raise TracebackParseError("Could not find any frames in %r." % string)
|
