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11
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aaronmk
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# Exception handling
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1371
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aaronmk
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import copy
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433
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aaronmk
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import atexit
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343
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aaronmk
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import sys
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1368
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aaronmk
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import traceback
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13
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aaronmk
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989
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aaronmk
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import format
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343
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aaronmk
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import strings
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826
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aaronmk
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import term
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343
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aaronmk
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import util
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445
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aaronmk
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def raise_(e): raise e
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1371
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aaronmk
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def sys_traceback():
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'''Note that Python tracebacks seems to have a bug that truncates them to
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only a few stack frames. See <http://bugs.python.org/issue7378>.'''
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return sys.exc_info()[2]
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# can't just return pointer to traceback because it will change :-(
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1368
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aaronmk
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1576
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aaronmk
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def has_tracebacks(e): return hasattr(e, 'tracebacks')
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1368
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aaronmk
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1371
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aaronmk
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def add_traceback(e):
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'''Adds current traceback to an exception if it doesn't already have one'''
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traceback_ = sys_traceback() # get first in case later code throws exception
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1576
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aaronmk
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if not has_tracebacks(e): e.tracebacks = []
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if util.list_get(e.tracebacks, 0) == traceback_: return
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e.tracebacks.insert(0, traceback_) # tracebacks have most recent call last
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1371
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aaronmk
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1576
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aaronmk
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def get_traceback_str(traceback_):
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1371
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aaronmk
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return ''.join(traceback.format_exception(None, None, traceback_)[:-1])
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# remove final "None" line ("exception name")
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1576
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aaronmk
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def get_e_tracebacks_str(e):
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try: tracebacks = e.tracebacks
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except AttributeError: return ''
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return ''.join(get_traceback_str(t) for t in tracebacks)
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343
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aaronmk
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def add_msg(e, msg): e.args = (strings.ensure_newl(str(e))+msg,)
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286
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aaronmk
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def repl_msg(e, **repls): e.args = (str(e) % repls,)
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279
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aaronmk
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974
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aaronmk
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def e_ct_exit_status(e_ct): return min(e_ct, 255)
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13
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aaronmk
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class ExceptionWithCause(Exception):
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def __init__(self, msg, cause=None):
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1610
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aaronmk
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add_traceback(self)
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if cause != None: msg += ': '+str_(cause)
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13
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aaronmk
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Exception.__init__(self, msg)
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343
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aaronmk
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1636
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aaronmk
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def str_(e):
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return ''.join(traceback.format_exception_only(type(e), e)).rstrip()
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433
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aaronmk
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1371
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aaronmk
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def print_ex(e, emph=True):
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1636
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aaronmk
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msg = str_(e)+'\n'+get_e_tracebacks_str(e)
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826
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aaronmk
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if emph:
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first_line, nl, rest = msg.partition('\n')
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msg = term.error(first_line)+nl+rest
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sys.stderr.write(msg)
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788
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aaronmk
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433
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aaronmk
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class ExTracker:
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def __init__(self):
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self.e_ct = 0
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974
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aaronmk
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def msg(self): return 'Encountered '+str(self.e_ct)+' error(s)'
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433
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aaronmk
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def track(self, e, **format):
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self.e_ct += 1
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print_ex(e, **format)
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985
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aaronmk
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def exit(self):
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if self.e_ct > 0: raise SystemExit(e_ct_exit_status(self.e_ct))
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975
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aaronmk
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class ExPercentTracker(ExTracker):
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983
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aaronmk
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def __init__(self, iter_text='iteration'):
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977
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aaronmk
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ExTracker.__init__(self)
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983
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aaronmk
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self.iter_text = iter_text
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977
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aaronmk
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self.iter_ct = None
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1616
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aaronmk
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self.err_iter_ct = None
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self.last_iter_num = None
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975
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aaronmk
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977
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aaronmk
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def add_iters(self, iter_ct):
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if self.iter_ct == None: self.iter_ct = 0
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self.iter_ct += iter_ct
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1616
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aaronmk
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def track(self, e, iter_num=None, **format):
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if iter_num != None:
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if iter_num != self.last_iter_num: # a new iter produced an error
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if self.err_iter_ct == None: self.err_iter_ct = 0
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self.err_iter_ct += 1
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self.last_iter_num = iter_num
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ExTracker.track(self, e, **format)
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977
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aaronmk
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def msg(self):
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msg = ExTracker.msg(self)
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1616
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aaronmk
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iter_text_plural = self.iter_text+'(s)'
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numerator = self.e_ct
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if self.err_iter_ct != None:
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1618
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aaronmk
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msg += ' in '+format.int2str(self.err_iter_ct)
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1616
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aaronmk
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numerator = self.err_iter_ct
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if self.iter_ct != None:
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msg += ('/'+format.int2str(self.iter_ct)+' '+iter_text_plural+' = '
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+format.to_percent(float(numerator)/self.iter_ct))
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977
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aaronmk
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return msg
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