|
|
# encoding: utf-8
|
|
|
|
|
|
"""Object to manage sys.excepthook()."""
|
|
|
|
|
|
__docformat__ = "restructuredtext en"
|
|
|
|
|
|
#-------------------------------------------------------------------------------
|
|
|
# Copyright (C) 2008 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-------------------------------------------------------------------------------
|
|
|
|
|
|
#-------------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-------------------------------------------------------------------------------
|
|
|
import sys
|
|
|
from traceback import format_list
|
|
|
|
|
|
class TracebackTrap(object):
|
|
|
""" Object to trap and format tracebacks.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, formatters=None):
|
|
|
# A list of formatters to apply.
|
|
|
if formatters is None:
|
|
|
formatters = []
|
|
|
self.formatters = formatters
|
|
|
|
|
|
# All of the traceback information provided to sys.excepthook().
|
|
|
self.args = None
|
|
|
|
|
|
# The previous hook before we replace it.
|
|
|
self.old_hook = None
|
|
|
|
|
|
|
|
|
def hook(self, *args):
|
|
|
""" This method actually implements the hook.
|
|
|
"""
|
|
|
self.args = args
|
|
|
|
|
|
def set(self):
|
|
|
""" Set the hook.
|
|
|
"""
|
|
|
|
|
|
if sys.excepthook is not self.hook:
|
|
|
self.old_hook = sys.excepthook
|
|
|
sys.excepthook = self.hook
|
|
|
|
|
|
def unset(self):
|
|
|
""" Unset the hook.
|
|
|
"""
|
|
|
|
|
|
sys.excepthook = self.old_hook
|
|
|
|
|
|
def clear(self):
|
|
|
""" Remove the stored traceback.
|
|
|
"""
|
|
|
|
|
|
self.args = None
|
|
|
|
|
|
def add_to_message(self, message):
|
|
|
""" Add the formatted display of the traceback to the message dictionary
|
|
|
being returned from the interpreter to its listeners.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
message : dict
|
|
|
"""
|
|
|
|
|
|
# If there was no traceback, then don't add anything.
|
|
|
if self.args is None:
|
|
|
return
|
|
|
|
|
|
# Go through the list of formatters and let them add their formatting.
|
|
|
traceback = {}
|
|
|
try:
|
|
|
for formatter in self.formatters:
|
|
|
traceback[formatter.identifier] = formatter(*self.args)
|
|
|
except:
|
|
|
# This works always, including with string exceptions.
|
|
|
traceback['fallback'] = repr(self.args)
|
|
|
|
|
|
message['traceback'] = traceback
|
|
|
|
|
|
|
