|
|
# -*- coding: utf-8 -*-
|
|
|
"""
|
|
|
Verbose and colourful traceback formatting.
|
|
|
|
|
|
**ColorTB**
|
|
|
|
|
|
I've always found it a bit hard to visually parse tracebacks in Python. The
|
|
|
ColorTB class is a solution to that problem. It colors the different parts of a
|
|
|
traceback in a manner similar to what you would expect from a syntax-highlighting
|
|
|
text editor.
|
|
|
|
|
|
Installation instructions for ColorTB::
|
|
|
|
|
|
import sys,ultratb
|
|
|
sys.excepthook = ultratb.ColorTB()
|
|
|
|
|
|
**VerboseTB**
|
|
|
|
|
|
I've also included a port of Ka-Ping Yee's "cgitb.py" that produces all kinds
|
|
|
of useful info when a traceback occurs. Ping originally had it spit out HTML
|
|
|
and intended it for CGI programmers, but why should they have all the fun? I
|
|
|
altered it to spit out colored text to the terminal. It's a bit overwhelming,
|
|
|
but kind of neat, and maybe useful for long-running programs that you believe
|
|
|
are bug-free. If a crash *does* occur in that type of program you want details.
|
|
|
Give it a shot--you'll love it or you'll hate it.
|
|
|
|
|
|
.. note::
|
|
|
|
|
|
The Verbose mode prints the variables currently visible where the exception
|
|
|
happened (shortening their strings if too long). This can potentially be
|
|
|
very slow, if you happen to have a huge data structure whose string
|
|
|
representation is complex to compute. Your computer may appear to freeze for
|
|
|
a while with cpu usage at 100%. If this occurs, you can cancel the traceback
|
|
|
with Ctrl-C (maybe hitting it more than once).
|
|
|
|
|
|
If you encounter this kind of situation often, you may want to use the
|
|
|
Verbose_novars mode instead of the regular Verbose, which avoids formatting
|
|
|
variables (but otherwise includes the information and context given by
|
|
|
Verbose).
|
|
|
|
|
|
.. note::
|
|
|
|
|
|
The verbose mode print all variables in the stack, which means it can
|
|
|
potentially leak sensitive information like access keys, or unencryted
|
|
|
password.
|
|
|
|
|
|
Installation instructions for VerboseTB::
|
|
|
|
|
|
import sys,ultratb
|
|
|
sys.excepthook = ultratb.VerboseTB()
|
|
|
|
|
|
Note: Much of the code in this module was lifted verbatim from the standard
|
|
|
library module 'traceback.py' and Ka-Ping Yee's 'cgitb.py'.
|
|
|
|
|
|
Color schemes
|
|
|
-------------
|
|
|
|
|
|
The colors are defined in the class TBTools through the use of the
|
|
|
ColorSchemeTable class. Currently the following exist:
|
|
|
|
|
|
- NoColor: allows all of this module to be used in any terminal (the color
|
|
|
escapes are just dummy blank strings).
|
|
|
|
|
|
- Linux: is meant to look good in a terminal like the Linux console (black
|
|
|
or very dark background).
|
|
|
|
|
|
- LightBG: similar to Linux but swaps dark/light colors to be more readable
|
|
|
in light background terminals.
|
|
|
|
|
|
- Neutral: a neutral color scheme that should be readable on both light and
|
|
|
dark background
|
|
|
|
|
|
You can implement other color schemes easily, the syntax is fairly
|
|
|
self-explanatory. Please send back new schemes you develop to the author for
|
|
|
possible inclusion in future releases.
|
|
|
|
|
|
Inheritance diagram:
|
|
|
|
|
|
.. inheritance-diagram:: IPython.core.ultratb
|
|
|
:parts: 3
|
|
|
"""
|
|
|
|
|
|
#*****************************************************************************
|
|
|
# Copyright (C) 2001 Nathaniel Gray <n8gray@caltech.edu>
|
|
|
# Copyright (C) 2001-2004 Fernando Perez <fperez@colorado.edu>
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#*****************************************************************************
|
|
|
|
|
|
|
|
|
import dis
|
|
|
import inspect
|
|
|
import keyword
|
|
|
import linecache
|
|
|
import os
|
|
|
import pydoc
|
|
|
import re
|
|
|
import sys
|
|
|
import time
|
|
|
import tokenize
|
|
|
import traceback
|
|
|
|
|
|
try: # Python 2
|
|
|
generate_tokens = tokenize.generate_tokens
|
|
|
except AttributeError: # Python 3
|
|
|
generate_tokens = tokenize.tokenize
|
|
|
|
|
|
# For purposes of monkeypatching inspect to fix a bug in it.
|
|
|
from inspect import getsourcefile, getfile, getmodule, \
|
|
|
ismodule, isclass, ismethod, isfunction, istraceback, isframe, iscode
|
|
|
|
|
|
# IPython's own modules
|
|
|
from IPython import get_ipython
|
|
|
from IPython.core import debugger
|
|
|
from IPython.core.display_trap import DisplayTrap
|
|
|
from IPython.core.excolors import exception_colors
|
|
|
from IPython.utils import PyColorize
|
|
|
from IPython.utils import path as util_path
|
|
|
from IPython.utils import py3compat
|
|
|
from IPython.utils.data import uniq_stable
|
|
|
from IPython.utils.terminal import get_terminal_size
|
|
|
|
|
|
from logging import info, error, debug
|
|
|
|
|
|
from importlib.util import source_from_cache
|
|
|
|
|
|
import IPython.utils.colorable as colorable
|
|
|
|
|
|
# Globals
|
|
|
# amount of space to put line numbers before verbose tracebacks
|
|
|
INDENT_SIZE = 8
|
|
|
|
|
|
# Default color scheme. This is used, for example, by the traceback
|
|
|
# formatter. When running in an actual IPython instance, the user's rc.colors
|
|
|
# value is used, but having a module global makes this functionality available
|
|
|
# to users of ultratb who are NOT running inside ipython.
|
|
|
DEFAULT_SCHEME = 'NoColor'
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
|
# Code begins
|
|
|
|
|
|
# Utility functions
|
|
|
def inspect_error():
|
|
|
"""Print a message about internal inspect errors.
|
|
|
|
|
|
These are unfortunately quite common."""
|
|
|
|
|
|
error('Internal Python error in the inspect module.\n'
|
|
|
'Below is the traceback from this internal error.\n')
|
|
|
|
|
|
|
|
|
# This function is a monkeypatch we apply to the Python inspect module. We have
|
|
|
# now found when it's needed (see discussion on issue gh-1456), and we have a
|
|
|
# test case (IPython.core.tests.test_ultratb.ChangedPyFileTest) that fails if
|
|
|
# the monkeypatch is not applied. TK, Aug 2012.
|
|
|
def findsource(object):
|
|
|
"""Return the entire source file and starting line number for an object.
|
|
|
|
|
|
The argument may be a module, class, method, function, traceback, frame,
|
|
|
or code object. The source code is returned as a list of all the lines
|
|
|
in the file and the line number indexes a line in that list. An IOError
|
|
|
is raised if the source code cannot be retrieved.
|
|
|
|
|
|
FIXED version with which we monkeypatch the stdlib to work around a bug."""
|
|
|
|
|
|
file = getsourcefile(object) or getfile(object)
|
|
|
# If the object is a frame, then trying to get the globals dict from its
|
|
|
# module won't work. Instead, the frame object itself has the globals
|
|
|
# dictionary.
|
|
|
globals_dict = None
|
|
|
if inspect.isframe(object):
|
|
|
# XXX: can this ever be false?
|
|
|
globals_dict = object.f_globals
|
|
|
else:
|
|
|
module = getmodule(object, file)
|
|
|
if module:
|
|
|
globals_dict = module.__dict__
|
|
|
lines = linecache.getlines(file, globals_dict)
|
|
|
if not lines:
|
|
|
raise IOError('could not get source code')
|
|
|
|
|
|
if ismodule(object):
|
|
|
return lines, 0
|
|
|
|
|
|
if isclass(object):
|
|
|
name = object.__name__
|
|
|
pat = re.compile(r'^(\s*)class\s*' + name + r'\b')
|
|
|
# make some effort to find the best matching class definition:
|
|
|
# use the one with the least indentation, which is the one
|
|
|
# that's most probably not inside a function definition.
|
|
|
candidates = []
|
|
|
for i, line in enumerate(lines):
|
|
|
match = pat.match(line)
|
|
|
if match:
|
|
|
# if it's at toplevel, it's already the best one
|
|
|
if line[0] == 'c':
|
|
|
return lines, i
|
|
|
# else add whitespace to candidate list
|
|
|
candidates.append((match.group(1), i))
|
|
|
if candidates:
|
|
|
# this will sort by whitespace, and by line number,
|
|
|
# less whitespace first
|
|
|
candidates.sort()
|
|
|
return lines, candidates[0][1]
|
|
|
else:
|
|
|
raise IOError('could not find class definition')
|
|
|
|
|
|
if ismethod(object):
|
|
|
object = object.__func__
|
|
|
if isfunction(object):
|
|
|
object = object.__code__
|
|
|
if istraceback(object):
|
|
|
object = object.tb_frame
|
|
|
if isframe(object):
|
|
|
object = object.f_code
|
|
|
if iscode(object):
|
|
|
if not hasattr(object, 'co_firstlineno'):
|
|
|
raise IOError('could not find function definition')
|
|
|
pat = re.compile(r'^(\s*def\s)|(.*(?<!\w)lambda(:|\s))|^(\s*@)')
|
|
|
pmatch = pat.match
|
|
|
# fperez - fix: sometimes, co_firstlineno can give a number larger than
|
|
|
# the length of lines, which causes an error. Safeguard against that.
|
|
|
lnum = min(object.co_firstlineno, len(lines)) - 1
|
|
|
while lnum > 0:
|
|
|
if pmatch(lines[lnum]):
|
|
|
break
|
|
|
lnum -= 1
|
|
|
|
|
|
return lines, lnum
|
|
|
raise IOError('could not find code object')
|
|
|
|
|
|
|
|
|
# This is a patched version of inspect.getargs that applies the (unmerged)
|
|
|
# patch for http://bugs.python.org/issue14611 by Stefano Taschini. This fixes
|
|
|
# https://github.com/ipython/ipython/issues/8205 and
|
|
|
# https://github.com/ipython/ipython/issues/8293
|
|
|
def getargs(co):
|
|
|
"""Get information about the arguments accepted by a code object.
|
|
|
|
|
|
Three things are returned: (args, varargs, varkw), where 'args' is
|
|
|
a list of argument names (possibly containing nested lists), and
|
|
|
'varargs' and 'varkw' are the names of the * and ** arguments or None."""
|
|
|
if not iscode(co):
|
|
|
raise TypeError('{!r} is not a code object'.format(co))
|
|
|
|
|
|
nargs = co.co_argcount
|
|
|
names = co.co_varnames
|
|
|
args = list(names[:nargs])
|
|
|
step = 0
|
|
|
|
|
|
# The following acrobatics are for anonymous (tuple) arguments.
|
|
|
for i in range(nargs):
|
|
|
if args[i][:1] in ('', '.'):
|
|
|
stack, remain, count = [], [], []
|
|
|
while step < len(co.co_code):
|
|
|
op = ord(co.co_code[step])
|
|
|
step = step + 1
|
|
|
if op >= dis.HAVE_ARGUMENT:
|
|
|
opname = dis.opname[op]
|
|
|
value = ord(co.co_code[step]) + ord(co.co_code[step+1])*256
|
|
|
step = step + 2
|
|
|
if opname in ('UNPACK_TUPLE', 'UNPACK_SEQUENCE'):
|
|
|
remain.append(value)
|
|
|
count.append(value)
|
|
|
elif opname in ('STORE_FAST', 'STORE_DEREF'):
|
|
|
if op in dis.haslocal:
|
|
|
stack.append(co.co_varnames[value])
|
|
|
elif op in dis.hasfree:
|
|
|
stack.append((co.co_cellvars + co.co_freevars)[value])
|
|
|
# Special case for sublists of length 1: def foo((bar))
|
|
|
# doesn't generate the UNPACK_TUPLE bytecode, so if
|
|
|
# `remain` is empty here, we have such a sublist.
|
|
|
if not remain:
|
|
|
stack[0] = [stack[0]]
|
|
|
break
|
|
|
else:
|
|
|
remain[-1] = remain[-1] - 1
|
|
|
while remain[-1] == 0:
|
|
|
remain.pop()
|
|
|
size = count.pop()
|
|
|
stack[-size:] = [stack[-size:]]
|
|
|
if not remain:
|
|
|
break
|
|
|
remain[-1] = remain[-1] - 1
|
|
|
if not remain:
|
|
|
break
|
|
|
args[i] = stack[0]
|
|
|
|
|
|
varargs = None
|
|
|
if co.co_flags & inspect.CO_VARARGS:
|
|
|
varargs = co.co_varnames[nargs]
|
|
|
nargs = nargs + 1
|
|
|
varkw = None
|
|
|
if co.co_flags & inspect.CO_VARKEYWORDS:
|
|
|
varkw = co.co_varnames[nargs]
|
|
|
return inspect.Arguments(args, varargs, varkw)
|
|
|
|
|
|
|
|
|
# Monkeypatch inspect to apply our bugfix.
|
|
|
def with_patch_inspect(f):
|
|
|
"""
|
|
|
Deprecated since IPython 6.0
|
|
|
decorator for monkeypatching inspect.findsource
|
|
|
"""
|
|
|
|
|
|
def wrapped(*args, **kwargs):
|
|
|
save_findsource = inspect.findsource
|
|
|
save_getargs = inspect.getargs
|
|
|
inspect.findsource = findsource
|
|
|
inspect.getargs = getargs
|
|
|
try:
|
|
|
return f(*args, **kwargs)
|
|
|
finally:
|
|
|
inspect.findsource = save_findsource
|
|
|
inspect.getargs = save_getargs
|
|
|
|
|
|
return wrapped
|
|
|
|
|
|
|
|
|
def fix_frame_records_filenames(records):
|
|
|
"""Try to fix the filenames in each record from inspect.getinnerframes().
|
|
|
|
|
|
Particularly, modules loaded from within zip files have useless filenames
|
|
|
attached to their code object, and inspect.getinnerframes() just uses it.
|
|
|
"""
|
|
|
fixed_records = []
|
|
|
for frame, filename, line_no, func_name, lines, index in records:
|
|
|
# Look inside the frame's globals dictionary for __file__,
|
|
|
# which should be better. However, keep Cython filenames since
|
|
|
# we prefer the source filenames over the compiled .so file.
|
|
|
if not filename.endswith(('.pyx', '.pxd', '.pxi')):
|
|
|
better_fn = frame.f_globals.get('__file__', None)
|
|
|
if isinstance(better_fn, str):
|
|
|
# Check the type just in case someone did something weird with
|
|
|
# __file__. It might also be None if the error occurred during
|
|
|
# import.
|
|
|
filename = better_fn
|
|
|
fixed_records.append((frame, filename, line_no, func_name, lines, index))
|
|
|
return fixed_records
|
|
|
|
|
|
|
|
|
@with_patch_inspect
|
|
|
def _fixed_getinnerframes(etb, context=1, tb_offset=0):
|
|
|
LNUM_POS, LINES_POS, INDEX_POS = 2, 4, 5
|
|
|
|
|
|
records = fix_frame_records_filenames(inspect.getinnerframes(etb, context))
|
|
|
# If the error is at the console, don't build any context, since it would
|
|
|
# otherwise produce 5 blank lines printed out (there is no file at the
|
|
|
# console)
|
|
|
rec_check = records[tb_offset:]
|
|
|
try:
|
|
|
rname = rec_check[0][1]
|
|
|
if rname == '<ipython console>' or rname.endswith('<string>'):
|
|
|
return rec_check
|
|
|
except IndexError:
|
|
|
pass
|
|
|
|
|
|
aux = traceback.extract_tb(etb)
|
|
|
assert len(records) == len(aux)
|
|
|
for i, (file, lnum, _, _) in enumerate(aux):
|
|
|
maybeStart = lnum - 1 - context // 2
|
|
|
start = max(maybeStart, 0)
|
|
|
end = start + context
|
|
|
lines = linecache.getlines(file)[start:end]
|
|
|
buf = list(records[i])
|
|
|
buf[LNUM_POS] = lnum
|
|
|
buf[INDEX_POS] = lnum - 1 - start
|
|
|
buf[LINES_POS] = lines
|
|
|
records[i] = tuple(buf)
|
|
|
return records[tb_offset:]
|
|
|
|
|
|
# Helper function -- largely belongs to VerboseTB, but we need the same
|
|
|
# functionality to produce a pseudo verbose TB for SyntaxErrors, so that they
|
|
|
# can be recognized properly by ipython.el's py-traceback-line-re
|
|
|
# (SyntaxErrors have to be treated specially because they have no traceback)
|
|
|
|
|
|
|
|
|
def _format_traceback_lines(lnum, index, lines, Colors, lvals, _line_format):
|
|
|
"""
|
|
|
Format tracebacks lines with pointing arrow, leading numbers...
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
|
|
|
lnum: int
|
|
|
index: int
|
|
|
lines: list[string]
|
|
|
Colors:
|
|
|
ColorScheme used.
|
|
|
lvals: bytes
|
|
|
Values of local variables, already colored, to inject just after the error line.
|
|
|
_line_format: f (str) -> (str, bool)
|
|
|
return (colorized version of str, failure to do so)
|
|
|
"""
|
|
|
numbers_width = INDENT_SIZE - 1
|
|
|
res = []
|
|
|
|
|
|
for i,line in enumerate(lines, lnum-index):
|
|
|
line = py3compat.cast_unicode(line)
|
|
|
|
|
|
new_line, err = _line_format(line, 'str')
|
|
|
if not err:
|
|
|
line = new_line
|
|
|
|
|
|
if i == lnum:
|
|
|
# This is the line with the error
|
|
|
pad = numbers_width - len(str(i))
|
|
|
num = '%s%s' % (debugger.make_arrow(pad), str(lnum))
|
|
|
line = '%s%s%s %s%s' % (Colors.linenoEm, num,
|
|
|
Colors.line, line, Colors.Normal)
|
|
|
else:
|
|
|
num = '%*s' % (numbers_width, i)
|
|
|
line = '%s%s%s %s' % (Colors.lineno, num,
|
|
|
Colors.Normal, line)
|
|
|
|
|
|
res.append(line)
|
|
|
if lvals and i == lnum:
|
|
|
res.append(lvals + '\n')
|
|
|
return res
|
|
|
|
|
|
def is_recursion_error(etype, value, records):
|
|
|
try:
|
|
|
# RecursionError is new in Python 3.5
|
|
|
recursion_error_type = RecursionError
|
|
|
except NameError:
|
|
|
recursion_error_type = RuntimeError
|
|
|
|
|
|
# The default recursion limit is 1000, but some of that will be taken up
|
|
|
# by stack frames in IPython itself. >500 frames probably indicates
|
|
|
# a recursion error.
|
|
|
return (etype is recursion_error_type) \
|
|
|
and "recursion" in str(value).lower() \
|
|
|
and len(records) > 500
|
|
|
|
|
|
def find_recursion(etype, value, records):
|
|
|
"""Identify the repeating stack frames from a RecursionError traceback
|
|
|
|
|
|
'records' is a list as returned by VerboseTB.get_records()
|
|
|
|
|
|
Returns (last_unique, repeat_length)
|
|
|
"""
|
|
|
# This involves a bit of guesswork - we want to show enough of the traceback
|
|
|
# to indicate where the recursion is occurring. We guess that the innermost
|
|
|
# quarter of the traceback (250 frames by default) is repeats, and find the
|
|
|
# first frame (from in to out) that looks different.
|
|
|
if not is_recursion_error(etype, value, records):
|
|
|
return len(records), 0
|
|
|
|
|
|
# Select filename, lineno, func_name to track frames with
|
|
|
records = [r[1:4] for r in records]
|
|
|
inner_frames = records[-(len(records)//4):]
|
|
|
frames_repeated = set(inner_frames)
|
|
|
|
|
|
last_seen_at = {}
|
|
|
longest_repeat = 0
|
|
|
i = len(records)
|
|
|
for frame in reversed(records):
|
|
|
i -= 1
|
|
|
if frame not in frames_repeated:
|
|
|
last_unique = i
|
|
|
break
|
|
|
|
|
|
if frame in last_seen_at:
|
|
|
distance = last_seen_at[frame] - i
|
|
|
longest_repeat = max(longest_repeat, distance)
|
|
|
|
|
|
last_seen_at[frame] = i
|
|
|
else:
|
|
|
last_unique = 0 # The whole traceback was recursion
|
|
|
|
|
|
return last_unique, longest_repeat
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Module classes
|
|
|
class TBTools(colorable.Colorable):
|
|
|
"""Basic tools used by all traceback printer classes."""
|
|
|
|
|
|
# Number of frames to skip when reporting tracebacks
|
|
|
tb_offset = 0
|
|
|
|
|
|
def __init__(self, color_scheme='NoColor', call_pdb=False, ostream=None, parent=None, config=None):
|
|
|
# Whether to call the interactive pdb debugger after printing
|
|
|
# tracebacks or not
|
|
|
super(TBTools, self).__init__(parent=parent, config=config)
|
|
|
self.call_pdb = call_pdb
|
|
|
|
|
|
# Output stream to write to. Note that we store the original value in
|
|
|
# a private attribute and then make the public ostream a property, so
|
|
|
# that we can delay accessing sys.stdout until runtime. The way
|
|
|
# things are written now, the sys.stdout object is dynamically managed
|
|
|
# so a reference to it should NEVER be stored statically. This
|
|
|
# property approach confines this detail to a single location, and all
|
|
|
# subclasses can simply access self.ostream for writing.
|
|
|
self._ostream = ostream
|
|
|
|
|
|
# Create color table
|
|
|
self.color_scheme_table = exception_colors()
|
|
|
|
|
|
self.set_colors(color_scheme)
|
|
|
self.old_scheme = color_scheme # save initial value for toggles
|
|
|
|
|
|
if call_pdb:
|
|
|
self.pdb = debugger.Pdb()
|
|
|
else:
|
|
|
self.pdb = None
|
|
|
|
|
|
def _get_ostream(self):
|
|
|
"""Output stream that exceptions are written to.
|
|
|
|
|
|
Valid values are:
|
|
|
|
|
|
- None: the default, which means that IPython will dynamically resolve
|
|
|
to sys.stdout. This ensures compatibility with most tools, including
|
|
|
Windows (where plain stdout doesn't recognize ANSI escapes).
|
|
|
|
|
|
- Any object with 'write' and 'flush' attributes.
|
|
|
"""
|
|
|
return sys.stdout if self._ostream is None else self._ostream
|
|
|
|
|
|
def _set_ostream(self, val):
|
|
|
assert val is None or (hasattr(val, 'write') and hasattr(val, 'flush'))
|
|
|
self._ostream = val
|
|
|
|
|
|
ostream = property(_get_ostream, _set_ostream)
|
|
|
|
|
|
def set_colors(self, *args, **kw):
|
|
|
"""Shorthand access to the color table scheme selector method."""
|
|
|
|
|
|
# Set own color table
|
|
|
self.color_scheme_table.set_active_scheme(*args, **kw)
|
|
|
# for convenience, set Colors to the active scheme
|
|
|
self.Colors = self.color_scheme_table.active_colors
|
|
|
# Also set colors of debugger
|
|
|
if hasattr(self, 'pdb') and self.pdb is not None:
|
|
|
self.pdb.set_colors(*args, **kw)
|
|
|
|
|
|
def color_toggle(self):
|
|
|
"""Toggle between the currently active color scheme and NoColor."""
|
|
|
|
|
|
if self.color_scheme_table.active_scheme_name == 'NoColor':
|
|
|
self.color_scheme_table.set_active_scheme(self.old_scheme)
|
|
|
self.Colors = self.color_scheme_table.active_colors
|
|
|
else:
|
|
|
self.old_scheme = self.color_scheme_table.active_scheme_name
|
|
|
self.color_scheme_table.set_active_scheme('NoColor')
|
|
|
self.Colors = self.color_scheme_table.active_colors
|
|
|
|
|
|
def stb2text(self, stb):
|
|
|
"""Convert a structured traceback (a list) to a string."""
|
|
|
return '\n'.join(stb)
|
|
|
|
|
|
def text(self, etype, value, tb, tb_offset=None, context=5):
|
|
|
"""Return formatted traceback.
|
|
|
|
|
|
Subclasses may override this if they add extra arguments.
|
|
|
"""
|
|
|
tb_list = self.structured_traceback(etype, value, tb,
|
|
|
tb_offset, context)
|
|
|
return self.stb2text(tb_list)
|
|
|
|
|
|
def structured_traceback(self, etype, evalue, tb, tb_offset=None,
|
|
|
context=5, mode=None):
|
|
|
"""Return a list of traceback frames.
|
|
|
|
|
|
Must be implemented by each class.
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
class ListTB(TBTools):
|
|
|
"""Print traceback information from a traceback list, with optional color.
|
|
|
|
|
|
Calling requires 3 arguments: (etype, evalue, elist)
|
|
|
as would be obtained by::
|
|
|
|
|
|
etype, evalue, tb = sys.exc_info()
|
|
|
if tb:
|
|
|
elist = traceback.extract_tb(tb)
|
|
|
else:
|
|
|
elist = None
|
|
|
|
|
|
It can thus be used by programs which need to process the traceback before
|
|
|
printing (such as console replacements based on the code module from the
|
|
|
standard library).
|
|
|
|
|
|
Because they are meant to be called without a full traceback (only a
|
|
|
list), instances of this class can't call the interactive pdb debugger."""
|
|
|
|
|
|
def __init__(self, color_scheme='NoColor', call_pdb=False, ostream=None, parent=None, config=None):
|
|
|
TBTools.__init__(self, color_scheme=color_scheme, call_pdb=call_pdb,
|
|
|
ostream=ostream, parent=parent,config=config)
|
|
|
|
|
|
def __call__(self, etype, value, elist):
|
|
|
self.ostream.flush()
|
|
|
self.ostream.write(self.text(etype, value, elist))
|
|
|
self.ostream.write('\n')
|
|
|
|
|
|
def structured_traceback(self, etype, value, elist, tb_offset=None,
|
|
|
context=5):
|
|
|
"""Return a color formatted string with the traceback info.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
etype : exception type
|
|
|
Type of the exception raised.
|
|
|
|
|
|
value : object
|
|
|
Data stored in the exception
|
|
|
|
|
|
elist : list
|
|
|
List of frames, see class docstring for details.
|
|
|
|
|
|
tb_offset : int, optional
|
|
|
Number of frames in the traceback to skip. If not given, the
|
|
|
instance value is used (set in constructor).
|
|
|
|
|
|
context : int, optional
|
|
|
Number of lines of context information to print.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
String with formatted exception.
|
|
|
"""
|
|
|
tb_offset = self.tb_offset if tb_offset is None else tb_offset
|
|
|
Colors = self.Colors
|
|
|
out_list = []
|
|
|
if elist:
|
|
|
|
|
|
if tb_offset and len(elist) > tb_offset:
|
|
|
elist = elist[tb_offset:]
|
|
|
|
|
|
out_list.append('Traceback %s(most recent call last)%s:' %
|
|
|
(Colors.normalEm, Colors.Normal) + '\n')
|
|
|
out_list.extend(self._format_list(elist))
|
|
|
# The exception info should be a single entry in the list.
|
|
|
lines = ''.join(self._format_exception_only(etype, value))
|
|
|
out_list.append(lines)
|
|
|
|
|
|
return out_list
|
|
|
|
|
|
def _format_list(self, extracted_list):
|
|
|
"""Format a list of traceback entry tuples for printing.
|
|
|
|
|
|
Given a list of tuples as returned by extract_tb() or
|
|
|
extract_stack(), return a list of strings ready for printing.
|
|
|
Each string in the resulting list corresponds to the item with the
|
|
|
same index in the argument list. Each string ends in a newline;
|
|
|
the strings may contain internal newlines as well, for those items
|
|
|
whose source text line is not None.
|
|
|
|
|
|
Lifted almost verbatim from traceback.py
|
|
|
"""
|
|
|
|
|
|
Colors = self.Colors
|
|
|
list = []
|
|
|
for filename, lineno, name, line in extracted_list[:-1]:
|
|
|
item = ' File %s"%s"%s, line %s%d%s, in %s%s%s\n' % \
|
|
|
(Colors.filename, filename, Colors.Normal,
|
|
|
Colors.lineno, lineno, Colors.Normal,
|
|
|
Colors.name, name, Colors.Normal)
|
|
|
if line:
|
|
|
item += ' %s\n' % line.strip()
|
|
|
list.append(item)
|
|
|
# Emphasize the last entry
|
|
|
filename, lineno, name, line = extracted_list[-1]
|
|
|
item = '%s File %s"%s"%s, line %s%d%s, in %s%s%s%s\n' % \
|
|
|
(Colors.normalEm,
|
|
|
Colors.filenameEm, filename, Colors.normalEm,
|
|
|
Colors.linenoEm, lineno, Colors.normalEm,
|
|
|
Colors.nameEm, name, Colors.normalEm,
|
|
|
Colors.Normal)
|
|
|
if line:
|
|
|
item += '%s %s%s\n' % (Colors.line, line.strip(),
|
|
|
Colors.Normal)
|
|
|
list.append(item)
|
|
|
return list
|
|
|
|
|
|
def _format_exception_only(self, etype, value):
|
|
|
"""Format the exception part of a traceback.
|
|
|
|
|
|
The arguments are the exception type and value such as given by
|
|
|
sys.exc_info()[:2]. The return value is a list of strings, each ending
|
|
|
in a newline. Normally, the list contains a single string; however,
|
|
|
for SyntaxError exceptions, it contains several lines that (when
|
|
|
printed) display detailed information about where the syntax error
|
|
|
occurred. The message indicating which exception occurred is the
|
|
|
always last string in the list.
|
|
|
|
|
|
Also lifted nearly verbatim from traceback.py
|
|
|
"""
|
|
|
have_filedata = False
|
|
|
Colors = self.Colors
|
|
|
list = []
|
|
|
stype = py3compat.cast_unicode(Colors.excName + etype.__name__ + Colors.Normal)
|
|
|
if value is None:
|
|
|
# Not sure if this can still happen in Python 2.6 and above
|
|
|
list.append(stype + '\n')
|
|
|
else:
|
|
|
if issubclass(etype, SyntaxError):
|
|
|
have_filedata = True
|
|
|
if not value.filename: value.filename = "<string>"
|
|
|
if value.lineno:
|
|
|
lineno = value.lineno
|
|
|
textline = linecache.getline(value.filename, value.lineno)
|
|
|
else:
|
|
|
lineno = 'unknown'
|
|
|
textline = ''
|
|
|
list.append('%s File %s"%s"%s, line %s%s%s\n' % \
|
|
|
(Colors.normalEm,
|
|
|
Colors.filenameEm, py3compat.cast_unicode(value.filename), Colors.normalEm,
|
|
|
Colors.linenoEm, lineno, Colors.Normal ))
|
|
|
if textline == '':
|
|
|
textline = py3compat.cast_unicode(value.text, "utf-8")
|
|
|
|
|
|
if textline is not None:
|
|
|
i = 0
|
|
|
while i < len(textline) and textline[i].isspace():
|
|
|
i += 1
|
|
|
list.append('%s %s%s\n' % (Colors.line,
|
|
|
textline.strip(),
|
|
|
Colors.Normal))
|
|
|
if value.offset is not None:
|
|
|
s = ' '
|
|
|
for c in textline[i:value.offset - 1]:
|
|
|
if c.isspace():
|
|
|
s += c
|
|
|
else:
|
|
|
s += ' '
|
|
|
list.append('%s%s^%s\n' % (Colors.caret, s,
|
|
|
Colors.Normal))
|
|
|
|
|
|
try:
|
|
|
s = value.msg
|
|
|
except Exception:
|
|
|
s = self._some_str(value)
|
|
|
if s:
|
|
|
list.append('%s%s:%s %s\n' % (stype, Colors.excName,
|
|
|
Colors.Normal, s))
|
|
|
else:
|
|
|
list.append('%s\n' % stype)
|
|
|
|
|
|
# sync with user hooks
|
|
|
if have_filedata:
|
|
|
ipinst = get_ipython()
|
|
|
if ipinst is not None:
|
|
|
ipinst.hooks.synchronize_with_editor(value.filename, value.lineno, 0)
|
|
|
|
|
|
return list
|
|
|
|
|
|
def get_exception_only(self, etype, value):
|
|
|
"""Only print the exception type and message, without a traceback.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
etype : exception type
|
|
|
value : exception value
|
|
|
"""
|
|
|
return ListTB.structured_traceback(self, etype, value, [])
|
|
|
|
|
|
def show_exception_only(self, etype, evalue):
|
|
|
"""Only print the exception type and message, without a traceback.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
etype : exception type
|
|
|
value : exception value
|
|
|
"""
|
|
|
# This method needs to use __call__ from *this* class, not the one from
|
|
|
# a subclass whose signature or behavior may be different
|
|
|
ostream = self.ostream
|
|
|
ostream.flush()
|
|
|
ostream.write('\n'.join(self.get_exception_only(etype, evalue)))
|
|
|
ostream.flush()
|
|
|
|
|
|
def _some_str(self, value):
|
|
|
# Lifted from traceback.py
|
|
|
try:
|
|
|
return py3compat.cast_unicode(str(value))
|
|
|
except:
|
|
|
return u'<unprintable %s object>' % type(value).__name__
|
|
|
|
|
|
|
|
|
#----------------------------------------------------------------------------
|
|
|
class VerboseTB(TBTools):
|
|
|
"""A port of Ka-Ping Yee's cgitb.py module that outputs color text instead
|
|
|
of HTML. Requires inspect and pydoc. Crazy, man.
|
|
|
|
|
|
Modified version which optionally strips the topmost entries from the
|
|
|
traceback, to be used with alternate interpreters (because their own code
|
|
|
would appear in the traceback)."""
|
|
|
|
|
|
def __init__(self, color_scheme='Linux', call_pdb=False, ostream=None,
|
|
|
tb_offset=0, long_header=False, include_vars=True,
|
|
|
check_cache=None, debugger_cls = None,
|
|
|
parent=None, config=None):
|
|
|
"""Specify traceback offset, headers and color scheme.
|
|
|
|
|
|
Define how many frames to drop from the tracebacks. Calling it with
|
|
|
tb_offset=1 allows use of this handler in interpreters which will have
|
|
|
their own code at the top of the traceback (VerboseTB will first
|
|
|
remove that frame before printing the traceback info)."""
|
|
|
TBTools.__init__(self, color_scheme=color_scheme, call_pdb=call_pdb,
|
|
|
ostream=ostream, parent=parent, config=config)
|
|
|
self.tb_offset = tb_offset
|
|
|
self.long_header = long_header
|
|
|
self.include_vars = include_vars
|
|
|
# By default we use linecache.checkcache, but the user can provide a
|
|
|
# different check_cache implementation. This is used by the IPython
|
|
|
# kernel to provide tracebacks for interactive code that is cached,
|
|
|
# by a compiler instance that flushes the linecache but preserves its
|
|
|
# own code cache.
|
|
|
if check_cache is None:
|
|
|
check_cache = linecache.checkcache
|
|
|
self.check_cache = check_cache
|
|
|
|
|
|
self.debugger_cls = debugger_cls or debugger.Pdb
|
|
|
|
|
|
def format_records(self, records, last_unique, recursion_repeat):
|
|
|
"""Format the stack frames of the traceback"""
|
|
|
frames = []
|
|
|
for r in records[:last_unique+recursion_repeat+1]:
|
|
|
#print '*** record:',file,lnum,func,lines,index # dbg
|
|
|
frames.append(self.format_record(*r))
|
|
|
|
|
|
if recursion_repeat:
|
|
|
frames.append('... last %d frames repeated, from the frame below ...\n' % recursion_repeat)
|
|
|
frames.append(self.format_record(*records[last_unique+recursion_repeat+1]))
|
|
|
|
|
|
return frames
|
|
|
|
|
|
def format_record(self, frame, file, lnum, func, lines, index):
|
|
|
"""Format a single stack frame"""
|
|
|
Colors = self.Colors # just a shorthand + quicker name lookup
|
|
|
ColorsNormal = Colors.Normal # used a lot
|
|
|
col_scheme = self.color_scheme_table.active_scheme_name
|
|
|
indent = ' ' * INDENT_SIZE
|
|
|
em_normal = '%s\n%s%s' % (Colors.valEm, indent, ColorsNormal)
|
|
|
undefined = '%sundefined%s' % (Colors.em, ColorsNormal)
|
|
|
tpl_link = '%s%%s%s' % (Colors.filenameEm, ColorsNormal)
|
|
|
tpl_call = 'in %s%%s%s%%s%s' % (Colors.vName, Colors.valEm,
|
|
|
ColorsNormal)
|
|
|
tpl_call_fail = 'in %s%%s%s(***failed resolving arguments***)%s' % \
|
|
|
(Colors.vName, Colors.valEm, ColorsNormal)
|
|
|
tpl_local_var = '%s%%s%s' % (Colors.vName, ColorsNormal)
|
|
|
tpl_global_var = '%sglobal%s %s%%s%s' % (Colors.em, ColorsNormal,
|
|
|
Colors.vName, ColorsNormal)
|
|
|
tpl_name_val = '%%s %s= %%s%s' % (Colors.valEm, ColorsNormal)
|
|
|
|
|
|
if not file:
|
|
|
file = '?'
|
|
|
elif file.startswith(str("<")) and file.endswith(str(">")):
|
|
|
# Not a real filename, no problem...
|
|
|
pass
|
|
|
elif not os.path.isabs(file):
|
|
|
# Try to make the filename absolute by trying all
|
|
|
# sys.path entries (which is also what linecache does)
|
|
|
for dirname in sys.path:
|
|
|
try:
|
|
|
fullname = os.path.join(dirname, file)
|
|
|
if os.path.isfile(fullname):
|
|
|
file = os.path.abspath(fullname)
|
|
|
break
|
|
|
except Exception:
|
|
|
# Just in case that sys.path contains very
|
|
|
# strange entries...
|
|
|
pass
|
|
|
|
|
|
file = py3compat.cast_unicode(file, util_path.fs_encoding)
|
|
|
link = tpl_link % util_path.compress_user(file)
|
|
|
args, varargs, varkw, locals_ = inspect.getargvalues(frame)
|
|
|
|
|
|
if func == '?':
|
|
|
call = ''
|
|
|
elif func == '<module>':
|
|
|
call = tpl_call % (func, '')
|
|
|
else:
|
|
|
# Decide whether to include variable details or not
|
|
|
var_repr = eqrepr if self.include_vars else nullrepr
|
|
|
try:
|
|
|
call = tpl_call % (func, inspect.formatargvalues(args,
|
|
|
varargs, varkw,
|
|
|
locals_, formatvalue=var_repr))
|
|
|
except KeyError:
|
|
|
# This happens in situations like errors inside generator
|
|
|
# expressions, where local variables are listed in the
|
|
|
# line, but can't be extracted from the frame. I'm not
|
|
|
# 100% sure this isn't actually a bug in inspect itself,
|
|
|
# but since there's no info for us to compute with, the
|
|
|
# best we can do is report the failure and move on. Here
|
|
|
# we must *not* call any traceback construction again,
|
|
|
# because that would mess up use of %debug later on. So we
|
|
|
# simply report the failure and move on. The only
|
|
|
# limitation will be that this frame won't have locals
|
|
|
# listed in the call signature. Quite subtle problem...
|
|
|
# I can't think of a good way to validate this in a unit
|
|
|
# test, but running a script consisting of:
|
|
|
# dict( (k,v.strip()) for (k,v) in range(10) )
|
|
|
# will illustrate the error, if this exception catch is
|
|
|
# disabled.
|
|
|
call = tpl_call_fail % func
|
|
|
|
|
|
# Don't attempt to tokenize binary files.
|
|
|
if file.endswith(('.so', '.pyd', '.dll')):
|
|
|
return '%s %s\n' % (link, call)
|
|
|
|
|
|
elif file.endswith(('.pyc', '.pyo')):
|
|
|
# Look up the corresponding source file.
|
|
|
try:
|
|
|
file = source_from_cache(file)
|
|
|
except ValueError:
|
|
|
# Failed to get the source file for some reason
|
|
|
# E.g. https://github.com/ipython/ipython/issues/9486
|
|
|
return '%s %s\n' % (link, call)
|
|
|
|
|
|
def linereader(file=file, lnum=[lnum], getline=linecache.getline):
|
|
|
line = getline(file, lnum[0])
|
|
|
lnum[0] += 1
|
|
|
return line
|
|
|
|
|
|
# Build the list of names on this line of code where the exception
|
|
|
# occurred.
|
|
|
try:
|
|
|
names = []
|
|
|
name_cont = False
|
|
|
|
|
|
for token_type, token, start, end, line in generate_tokens(linereader):
|
|
|
# build composite names
|
|
|
if token_type == tokenize.NAME and token not in keyword.kwlist:
|
|
|
if name_cont:
|
|
|
# Continuation of a dotted name
|
|
|
try:
|
|
|
names[-1].append(token)
|
|
|
except IndexError:
|
|
|
names.append([token])
|
|
|
name_cont = False
|
|
|
else:
|
|
|
# Regular new names. We append everything, the caller
|
|
|
# will be responsible for pruning the list later. It's
|
|
|
# very tricky to try to prune as we go, b/c composite
|
|
|
# names can fool us. The pruning at the end is easy
|
|
|
# to do (or the caller can print a list with repeated
|
|
|
# names if so desired.
|
|
|
names.append([token])
|
|
|
elif token == '.':
|
|
|
name_cont = True
|
|
|
elif token_type == tokenize.NEWLINE:
|
|
|
break
|
|
|
|
|
|
except (IndexError, UnicodeDecodeError, SyntaxError):
|
|
|
# signals exit of tokenizer
|
|
|
# SyntaxError can occur if the file is not actually Python
|
|
|
# - see gh-6300
|
|
|
pass
|
|
|
except tokenize.TokenError as msg:
|
|
|
# Tokenizing may fail for various reasons, many of which are
|
|
|
# harmless. (A good example is when the line in question is the
|
|
|
# close of a triple-quoted string, cf gh-6864). We don't want to
|
|
|
# show this to users, but want make it available for debugging
|
|
|
# purposes.
|
|
|
_m = ("An unexpected error occurred while tokenizing input\n"
|
|
|
"The following traceback may be corrupted or invalid\n"
|
|
|
"The error message is: %s\n" % msg)
|
|
|
debug(_m)
|
|
|
|
|
|
# Join composite names (e.g. "dict.fromkeys")
|
|
|
names = ['.'.join(n) for n in names]
|
|
|
# prune names list of duplicates, but keep the right order
|
|
|
unique_names = uniq_stable(names)
|
|
|
|
|
|
# Start loop over vars
|
|
|
lvals = ''
|
|
|
lvals_list = []
|
|
|
if self.include_vars:
|
|
|
for name_full in unique_names:
|
|
|
name_base = name_full.split('.', 1)[0]
|
|
|
if name_base in frame.f_code.co_varnames:
|
|
|
if name_base in locals_:
|
|
|
try:
|
|
|
value = repr(eval(name_full, locals_))
|
|
|
except:
|
|
|
value = undefined
|
|
|
else:
|
|
|
value = undefined
|
|
|
name = tpl_local_var % name_full
|
|
|
else:
|
|
|
if name_base in frame.f_globals:
|
|
|
try:
|
|
|
value = repr(eval(name_full, frame.f_globals))
|
|
|
except:
|
|
|
value = undefined
|
|
|
else:
|
|
|
value = undefined
|
|
|
name = tpl_global_var % name_full
|
|
|
lvals_list.append(tpl_name_val % (name, value))
|
|
|
if lvals_list:
|
|
|
lvals = '%s%s' % (indent, em_normal.join(lvals_list))
|
|
|
|
|
|
level = '%s %s\n' % (link, call)
|
|
|
|
|
|
if index is None:
|
|
|
return level
|
|
|
else:
|
|
|
_line_format = PyColorize.Parser(style=col_scheme, parent=self).format2
|
|
|
return '%s%s' % (level, ''.join(
|
|
|
_format_traceback_lines(lnum, index, lines, Colors, lvals,
|
|
|
_line_format)))
|
|
|
|
|
|
def prepare_chained_exception_message(self, cause):
|
|
|
direct_cause = "\nThe above exception was the direct cause of the following exception:\n"
|
|
|
exception_during_handling = "\nDuring handling of the above exception, another exception occurred:\n"
|
|
|
|
|
|
if cause:
|
|
|
message = [[direct_cause]]
|
|
|
else:
|
|
|
message = [[exception_during_handling]]
|
|
|
return message
|
|
|
|
|
|
def prepare_header(self, etype, long_version=False):
|
|
|
colors = self.Colors # just a shorthand + quicker name lookup
|
|
|
colorsnormal = colors.Normal # used a lot
|
|
|
exc = '%s%s%s' % (colors.excName, etype, colorsnormal)
|
|
|
width = min(75, get_terminal_size()[0])
|
|
|
if long_version:
|
|
|
# Header with the exception type, python version, and date
|
|
|
pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
|
|
|
date = time.ctime(time.time())
|
|
|
|
|
|
head = '%s%s%s\n%s%s%s\n%s' % (colors.topline, '-' * width, colorsnormal,
|
|
|
exc, ' ' * (width - len(str(etype)) - len(pyver)),
|
|
|
pyver, date.rjust(width) )
|
|
|
head += "\nA problem occurred executing Python code. Here is the sequence of function" \
|
|
|
"\ncalls leading up to the error, with the most recent (innermost) call last."
|
|
|
else:
|
|
|
# Simplified header
|
|
|
head = '%s%s' % (exc, 'Traceback (most recent call last)'. \
|
|
|
rjust(width - len(str(etype))) )
|
|
|
|
|
|
return head
|
|
|
|
|
|
def format_exception(self, etype, evalue):
|
|
|
colors = self.Colors # just a shorthand + quicker name lookup
|
|
|
colorsnormal = colors.Normal # used a lot
|
|
|
# Get (safely) a string form of the exception info
|
|
|
try:
|
|
|
etype_str, evalue_str = map(str, (etype, evalue))
|
|
|
except:
|
|
|
# User exception is improperly defined.
|
|
|
etype, evalue = str, sys.exc_info()[:2]
|
|
|
etype_str, evalue_str = map(str, (etype, evalue))
|
|
|
# ... and format it
|
|
|
return ['%s%s%s: %s' % (colors.excName, etype_str,
|
|
|
colorsnormal, py3compat.cast_unicode(evalue_str))]
|
|
|
|
|
|
def format_exception_as_a_whole(self, etype, evalue, etb, number_of_lines_of_context, tb_offset):
|
|
|
"""Formats the header, traceback and exception message for a single exception.
|
|
|
|
|
|
This may be called multiple times by Python 3 exception chaining
|
|
|
(PEP 3134).
|
|
|
"""
|
|
|
# some locals
|
|
|
orig_etype = etype
|
|
|
try:
|
|
|
etype = etype.__name__
|
|
|
except AttributeError:
|
|
|
pass
|
|
|
|
|
|
tb_offset = self.tb_offset if tb_offset is None else tb_offset
|
|
|
head = self.prepare_header(etype, self.long_header)
|
|
|
records = self.get_records(etb, number_of_lines_of_context, tb_offset)
|
|
|
|
|
|
if records is None:
|
|
|
return ""
|
|
|
|
|
|
last_unique, recursion_repeat = find_recursion(orig_etype, evalue, records)
|
|
|
|
|
|
frames = self.format_records(records, last_unique, recursion_repeat)
|
|
|
|
|
|
formatted_exception = self.format_exception(etype, evalue)
|
|
|
if records:
|
|
|
filepath, lnum = records[-1][1:3]
|
|
|
filepath = os.path.abspath(filepath)
|
|
|
ipinst = get_ipython()
|
|
|
if ipinst is not None:
|
|
|
ipinst.hooks.synchronize_with_editor(filepath, lnum, 0)
|
|
|
|
|
|
return [[head] + frames + [''.join(formatted_exception[0])]]
|
|
|
|
|
|
def get_records(self, etb, number_of_lines_of_context, tb_offset):
|
|
|
try:
|
|
|
# Try the default getinnerframes and Alex's: Alex's fixes some
|
|
|
# problems, but it generates empty tracebacks for console errors
|
|
|
# (5 blanks lines) where none should be returned.
|
|
|
return _fixed_getinnerframes(etb, number_of_lines_of_context, tb_offset)
|
|
|
except UnicodeDecodeError:
|
|
|
# This can occur if a file's encoding magic comment is wrong.
|
|
|
# I can't see a way to recover without duplicating a bunch of code
|
|
|
# from the stdlib traceback module. --TK
|
|
|
error('\nUnicodeDecodeError while processing traceback.\n')
|
|
|
return None
|
|
|
except:
|
|
|
# FIXME: I've been getting many crash reports from python 2.3
|
|
|
# users, traceable to inspect.py. If I can find a small test-case
|
|
|
# to reproduce this, I should either write a better workaround or
|
|
|
# file a bug report against inspect (if that's the real problem).
|
|
|
# So far, I haven't been able to find an isolated example to
|
|
|
# reproduce the problem.
|
|
|
inspect_error()
|
|
|
traceback.print_exc(file=self.ostream)
|
|
|
info('\nUnfortunately, your original traceback can not be constructed.\n')
|
|
|
return None
|
|
|
|
|
|
def get_parts_of_chained_exception(self, evalue):
|
|
|
def get_chained_exception(exception_value):
|
|
|
cause = getattr(exception_value, '__cause__', None)
|
|
|
if cause:
|
|
|
return cause
|
|
|
if getattr(exception_value, '__suppress_context__', False):
|
|
|
return None
|
|
|
return getattr(exception_value, '__context__', None)
|
|
|
|
|
|
chained_evalue = get_chained_exception(evalue)
|
|
|
|
|
|
if chained_evalue:
|
|
|
return chained_evalue.__class__, chained_evalue, chained_evalue.__traceback__
|
|
|
|
|
|
def structured_traceback(self, etype, evalue, etb, tb_offset=None,
|
|
|
number_of_lines_of_context=5):
|
|
|
"""Return a nice text document describing the traceback."""
|
|
|
|
|
|
formatted_exception = self.format_exception_as_a_whole(etype, evalue, etb, number_of_lines_of_context,
|
|
|
tb_offset)
|
|
|
|
|
|
colors = self.Colors # just a shorthand + quicker name lookup
|
|
|
colorsnormal = colors.Normal # used a lot
|
|
|
head = '%s%s%s' % (colors.topline, '-' * min(75, get_terminal_size()[0]), colorsnormal)
|
|
|
structured_traceback_parts = [head]
|
|
|
chained_exceptions_tb_offset = 0
|
|
|
lines_of_context = 3
|
|
|
formatted_exceptions = formatted_exception
|
|
|
exception = self.get_parts_of_chained_exception(evalue)
|
|
|
if exception:
|
|
|
formatted_exceptions += self.prepare_chained_exception_message(evalue.__cause__)
|
|
|
etype, evalue, etb = exception
|
|
|
else:
|
|
|
evalue = None
|
|
|
chained_exc_ids = set()
|
|
|
while evalue:
|
|
|
formatted_exceptions += self.format_exception_as_a_whole(etype, evalue, etb, lines_of_context,
|
|
|
chained_exceptions_tb_offset)
|
|
|
exception = self.get_parts_of_chained_exception(evalue)
|
|
|
|
|
|
if exception and not id(exception[1]) in chained_exc_ids:
|
|
|
chained_exc_ids.add(id(exception[1])) # trace exception to avoid infinite 'cause' loop
|
|
|
formatted_exceptions += self.prepare_chained_exception_message(evalue.__cause__)
|
|
|
etype, evalue, etb = exception
|
|
|
else:
|
|
|
evalue = None
|
|
|
|
|
|
# we want to see exceptions in a reversed order:
|
|
|
# the first exception should be on top
|
|
|
for formatted_exception in reversed(formatted_exceptions):
|
|
|
structured_traceback_parts += formatted_exception
|
|
|
|
|
|
return structured_traceback_parts
|
|
|
|
|
|
def debugger(self, force=False):
|
|
|
"""Call up the pdb debugger if desired, always clean up the tb
|
|
|
reference.
|
|
|
|
|
|
Keywords:
|
|
|
|
|
|
- force(False): by default, this routine checks the instance call_pdb
|
|
|
flag and does not actually invoke the debugger if the flag is false.
|
|
|
The 'force' option forces the debugger to activate even if the flag
|
|
|
is false.
|
|
|
|
|
|
If the call_pdb flag is set, the pdb interactive debugger is
|
|
|
invoked. In all cases, the self.tb reference to the current traceback
|
|
|
is deleted to prevent lingering references which hamper memory
|
|
|
management.
|
|
|
|
|
|
Note that each call to pdb() does an 'import readline', so if your app
|
|
|
requires a special setup for the readline completers, you'll have to
|
|
|
fix that by hand after invoking the exception handler."""
|
|
|
|
|
|
if force or self.call_pdb:
|
|
|
if self.pdb is None:
|
|
|
self.pdb = self.debugger_cls()
|
|
|
# the system displayhook may have changed, restore the original
|
|
|
# for pdb
|
|
|
display_trap = DisplayTrap(hook=sys.__displayhook__)
|
|
|
with display_trap:
|
|
|
self.pdb.reset()
|
|
|
# Find the right frame so we don't pop up inside ipython itself
|
|
|
if hasattr(self, 'tb') and self.tb is not None:
|
|
|
etb = self.tb
|
|
|
else:
|
|
|
etb = self.tb = sys.last_traceback
|
|
|
while self.tb is not None and self.tb.tb_next is not None:
|
|
|
self.tb = self.tb.tb_next
|
|
|
if etb and etb.tb_next:
|
|
|
etb = etb.tb_next
|
|
|
self.pdb.botframe = etb.tb_frame
|
|
|
self.pdb.interaction(None, etb)
|
|
|
|
|
|
if hasattr(self, 'tb'):
|
|
|
del self.tb
|
|
|
|
|
|
def handler(self, info=None):
|
|
|
(etype, evalue, etb) = info or sys.exc_info()
|
|
|
self.tb = etb
|
|
|
ostream = self.ostream
|
|
|
ostream.flush()
|
|
|
ostream.write(self.text(etype, evalue, etb))
|
|
|
ostream.write('\n')
|
|
|
ostream.flush()
|
|
|
|
|
|
# Changed so an instance can just be called as VerboseTB_inst() and print
|
|
|
# out the right info on its own.
|
|
|
def __call__(self, etype=None, evalue=None, etb=None):
|
|
|
"""This hook can replace sys.excepthook (for Python 2.1 or higher)."""
|
|
|
if etb is None:
|
|
|
self.handler()
|
|
|
else:
|
|
|
self.handler((etype, evalue, etb))
|
|
|
try:
|
|
|
self.debugger()
|
|
|
except KeyboardInterrupt:
|
|
|
print("\nKeyboardInterrupt")
|
|
|
|
|
|
|
|
|
#----------------------------------------------------------------------------
|
|
|
class FormattedTB(VerboseTB, ListTB):
|
|
|
"""Subclass ListTB but allow calling with a traceback.
|
|
|
|
|
|
It can thus be used as a sys.excepthook for Python > 2.1.
|
|
|
|
|
|
Also adds 'Context' and 'Verbose' modes, not available in ListTB.
|
|
|
|
|
|
Allows a tb_offset to be specified. This is useful for situations where
|
|
|
one needs to remove a number of topmost frames from the traceback (such as
|
|
|
occurs with python programs that themselves execute other python code,
|
|
|
like Python shells). """
|
|
|
|
|
|
def __init__(self, mode='Plain', color_scheme='Linux', call_pdb=False,
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ostream=None,
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tb_offset=0, long_header=False, include_vars=False,
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check_cache=None, debugger_cls=None,
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parent=None, config=None):
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# NEVER change the order of this list. Put new modes at the end:
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self.valid_modes = ['Plain', 'Context', 'Verbose']
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self.verbose_modes = self.valid_modes[1:3]
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VerboseTB.__init__(self, color_scheme=color_scheme, call_pdb=call_pdb,
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ostream=ostream, tb_offset=tb_offset,
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long_header=long_header, include_vars=include_vars,
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check_cache=check_cache, debugger_cls=debugger_cls,
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parent=parent, config=config)
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# Different types of tracebacks are joined with different separators to
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# form a single string. They are taken from this dict
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self._join_chars = dict(Plain='', Context='\n', Verbose='\n')
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# set_mode also sets the tb_join_char attribute
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self.set_mode(mode)
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def _extract_tb(self, tb):
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if tb:
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return traceback.extract_tb(tb)
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else:
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return None
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def structured_traceback(self, etype, value, tb, tb_offset=None, number_of_lines_of_context=5):
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tb_offset = self.tb_offset if tb_offset is None else tb_offset
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mode = self.mode
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if mode in self.verbose_modes:
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# Verbose modes need a full traceback
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return VerboseTB.structured_traceback(
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self, etype, value, tb, tb_offset, number_of_lines_of_context
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)
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else:
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# We must check the source cache because otherwise we can print
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# out-of-date source code.
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self.check_cache()
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# Now we can extract and format the exception
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elist = self._extract_tb(tb)
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return ListTB.structured_traceback(
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self, etype, value, elist, tb_offset, number_of_lines_of_context
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)
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def stb2text(self, stb):
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"""Convert a structured traceback (a list) to a string."""
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return self.tb_join_char.join(stb)
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def set_mode(self, mode=None):
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"""Switch to the desired mode.
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If mode is not specified, cycles through the available modes."""
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if not mode:
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new_idx = (self.valid_modes.index(self.mode) + 1 ) % \
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len(self.valid_modes)
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self.mode = self.valid_modes[new_idx]
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elif mode not in self.valid_modes:
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raise ValueError('Unrecognized mode in FormattedTB: <' + mode + '>\n'
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'Valid modes: ' + str(self.valid_modes))
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else:
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self.mode = mode
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# include variable details only in 'Verbose' mode
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self.include_vars = (self.mode == self.valid_modes[2])
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# Set the join character for generating text tracebacks
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self.tb_join_char = self._join_chars[self.mode]
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# some convenient shortcuts
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def plain(self):
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self.set_mode(self.valid_modes[0])
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def context(self):
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self.set_mode(self.valid_modes[1])
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def verbose(self):
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self.set_mode(self.valid_modes[2])
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#----------------------------------------------------------------------------
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class AutoFormattedTB(FormattedTB):
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"""A traceback printer which can be called on the fly.
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It will find out about exceptions by itself.
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A brief example::
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AutoTB = AutoFormattedTB(mode = 'Verbose',color_scheme='Linux')
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try:
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...
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except:
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AutoTB() # or AutoTB(out=logfile) where logfile is an open file object
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"""
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def __call__(self, etype=None, evalue=None, etb=None,
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out=None, tb_offset=None):
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"""Print out a formatted exception traceback.
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|
Optional arguments:
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- out: an open file-like object to direct output to.
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- tb_offset: the number of frames to skip over in the stack, on a
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per-call basis (this overrides temporarily the instance's tb_offset
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given at initialization time. """
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if out is None:
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out = self.ostream
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out.flush()
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out.write(self.text(etype, evalue, etb, tb_offset))
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out.write('\n')
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|
out.flush()
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|
# FIXME: we should remove the auto pdb behavior from here and leave
|
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|
# that to the clients.
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|
try:
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|
self.debugger()
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|
except KeyboardInterrupt:
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|
print("\nKeyboardInterrupt")
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|
def structured_traceback(self, etype=None, value=None, tb=None,
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|
tb_offset=None, number_of_lines_of_context=5):
|
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|
if etype is None:
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|
etype, value, tb = sys.exc_info()
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|
self.tb = tb
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|
return FormattedTB.structured_traceback(
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|
|
self, etype, value, tb, tb_offset, number_of_lines_of_context)
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|
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|
#---------------------------------------------------------------------------
|
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|
|
# A simple class to preserve Nathan's original functionality.
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|
class ColorTB(FormattedTB):
|
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|
"""Shorthand to initialize a FormattedTB in Linux colors mode."""
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|
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|
def __init__(self, color_scheme='Linux', call_pdb=0, **kwargs):
|
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|
FormattedTB.__init__(self, color_scheme=color_scheme,
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|
|
call_pdb=call_pdb, **kwargs)
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|
|
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|
|
class SyntaxTB(ListTB):
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|
"""Extension which holds some state: the last exception value"""
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|
def __init__(self, color_scheme='NoColor', parent=None, config=None):
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|
ListTB.__init__(self, color_scheme, parent=parent, config=config)
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|
|
self.last_syntax_error = None
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|
|
|
def __call__(self, etype, value, elist):
|
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|
self.last_syntax_error = value
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|
|
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|
ListTB.__call__(self, etype, value, elist)
|
|
|
|
|
|
def structured_traceback(self, etype, value, elist, tb_offset=None,
|
|
|
context=5):
|
|
|
# If the source file has been edited, the line in the syntax error can
|
|
|
# be wrong (retrieved from an outdated cache). This replaces it with
|
|
|
# the current value.
|
|
|
if isinstance(value, SyntaxError) \
|
|
|
and isinstance(value.filename, str) \
|
|
|
and isinstance(value.lineno, int):
|
|
|
linecache.checkcache(value.filename)
|
|
|
newtext = linecache.getline(value.filename, value.lineno)
|
|
|
if newtext:
|
|
|
value.text = newtext
|
|
|
self.last_syntax_error = value
|
|
|
return super(SyntaxTB, self).structured_traceback(etype, value, elist,
|
|
|
tb_offset=tb_offset, context=context)
|
|
|
|
|
|
def clear_err_state(self):
|
|
|
"""Return the current error state and clear it"""
|
|
|
e = self.last_syntax_error
|
|
|
self.last_syntax_error = None
|
|
|
return e
|
|
|
|
|
|
def stb2text(self, stb):
|
|
|
"""Convert a structured traceback (a list) to a string."""
|
|
|
return ''.join(stb)
|
|
|
|
|
|
|
|
|
# some internal-use functions
|
|
|
def text_repr(value):
|
|
|
"""Hopefully pretty robust repr equivalent."""
|
|
|
# this is pretty horrible but should always return *something*
|
|
|
try:
|
|
|
return pydoc.text.repr(value)
|
|
|
except KeyboardInterrupt:
|
|
|
raise
|
|
|
except:
|
|
|
try:
|
|
|
return repr(value)
|
|
|
except KeyboardInterrupt:
|
|
|
raise
|
|
|
except:
|
|
|
try:
|
|
|
# all still in an except block so we catch
|
|
|
# getattr raising
|
|
|
name = getattr(value, '__name__', None)
|
|
|
if name:
|
|
|
# ick, recursion
|
|
|
return text_repr(name)
|
|
|
klass = getattr(value, '__class__', None)
|
|
|
if klass:
|
|
|
return '%s instance' % text_repr(klass)
|
|
|
except KeyboardInterrupt:
|
|
|
raise
|
|
|
except:
|
|
|
return 'UNRECOVERABLE REPR FAILURE'
|
|
|
|
|
|
|
|
|
def eqrepr(value, repr=text_repr):
|
|
|
return '=%s' % repr(value)
|
|
|
|
|
|
|
|
|
def nullrepr(value, repr=text_repr):
|
|
|
return ''
|
|
|
|
