Rename third_party/webpagereplay to third_party/web-page-replay

telemetry/third_party/webpagereplay/exception_formatter.py

-# Copyright 2015 Google Inc. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import math
-import os
-import sys
-import traceback
-
-
-def PrintFormattedException(msg=None):
-  exception_class, exception, tb = sys.exc_info()
-
-  def _GetFinalFrame(tb_level):
-    while tb_level.tb_next:
-      tb_level = tb_level.tb_next
-    return tb_level.tb_frame
-
-  processed_tb = traceback.extract_tb(tb)
-  frame = _GetFinalFrame(tb)
-  exception_list = traceback.format_exception_only(exception_class, exception)
-  exception_string = '\n'.join(l.strip() for l in exception_list)
-
-  if msg:
-    print >> sys.stderr
-    print >> sys.stderr, msg
-
-  _PrintFormattedTrace(processed_tb, frame, exception_string)
-
-def PrintFormattedFrame(frame, exception_string=None):
-  _PrintFormattedTrace(traceback.extract_stack(frame), frame, exception_string)
-
-
-def _PrintFormattedTrace(processed_tb, frame, exception_string=None):
-  """Prints an Exception in a more useful format than the default.
-  """
-  print >> sys.stderr
-
-  # Format the traceback.
-  base_dir = os.path.dirname(__file__)
-  print >> sys.stderr, 'Traceback (most recent call last):'
-  for filename, line, function, text in processed_tb:
-    filename = os.path.abspath(filename)
-    if filename.startswith(base_dir):
-      filename = filename[len(base_dir)+1:]
-    print >> sys.stderr, '  %s at %s:%d' % (function, filename, line)
-    print >> sys.stderr, '    %s' % text
-
-  # Format the exception.
-  if exception_string:
-    print >> sys.stderr, exception_string
-
-  # Format the locals.
-  local_variables = [(variable, value) for variable, value in
-                     frame.f_locals.iteritems() if variable != 'self']
-  print >> sys.stderr
-  print >> sys.stderr, 'Locals:'
-  if local_variables:
-    longest_variable = max(len(v) for v, _ in local_variables)
-    for variable, value in sorted(local_variables):
-      value = repr(value)
-      possibly_truncated_value = _AbbreviateMiddleOfString(value, ' ... ', 1024)
-      truncation_indication = ''
-      if len(possibly_truncated_value) != len(value):
-        truncation_indication = ' (truncated)'
-      print >> sys.stderr, '  %s: %s%s' % (variable.ljust(longest_variable + 1),
-                                           possibly_truncated_value,
-                                           truncation_indication)
-  else:
-    print >> sys.stderr, '  No locals!'
-
-  print >> sys.stderr
-  sys.stderr.flush()
-
-
-def _AbbreviateMiddleOfString(target, middle, max_length):
-  if max_length < 0:
-    raise ValueError('Must provide positive max_length')
-  if len(middle) > max_length:
-    raise ValueError('middle must not be greater than max_length')
-
-  if len(target) <= max_length:
-    return target
-  half_length = (max_length - len(middle)) / 2.
-  return (target[:int(math.floor(half_length))] + middle +
-          target[-int(math.ceil(half_length)):])