Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/tbutils.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # -*- coding: utf-8 -*-
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2 """One of the oft-cited tenets of Python is that it is better to ask
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3 forgiveness than permission. That is, there are many cases where it is
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4 more inclusive and correct to handle exceptions than spend extra lines
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5 and execution time checking for conditions. This philosophy makes good
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6 exception handling features all the more important. Unfortunately
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7 Python's :mod:`traceback` module is woefully behind the times.
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8
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9 The ``tbutils`` module provides two disparate but complementary featuresets:
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10
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11 1. With :class:`ExceptionInfo` and :class:`TracebackInfo`, the
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12 ability to extract, construct, manipulate, format, and serialize
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13 exceptions, tracebacks, and callstacks.
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14 2. With :class:`ParsedException`, the ability to find and parse tracebacks
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15 from captured output such as logs and stdout.
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16
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17 There is also the :class:`ContextualTracebackInfo` variant of
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18 :class:`TracebackInfo`, which includes much more information from each
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19 frame of the callstack, including values of locals and neighboring
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20 lines of code.
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21 """
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22
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23 from __future__ import print_function
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24
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25 import re
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26 import sys
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27 import linecache
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28
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29
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30 try:
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31 text = unicode # Python 2
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32 except NameError:
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33 text = str # Python 3
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34
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35
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36 # TODO: chaining primitives? what are real use cases where these help?
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37
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38 # TODO: print_* for backwards compatibility
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39 # __all__ = ['extract_stack', 'extract_tb', 'format_exception',
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40 # 'format_exception_only', 'format_list', 'format_stack',
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41 # 'format_tb', 'print_exc', 'format_exc', 'print_exception',
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42 # 'print_last', 'print_stack', 'print_tb']
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43
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44
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45 __all__ = ['ExceptionInfo', 'TracebackInfo', 'Callpoint',
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46 'ContextualExceptionInfo', 'ContextualTracebackInfo',
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47 'ContextualCallpoint', 'print_exception', 'ParsedException']
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48
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49
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50 class Callpoint(object):
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51 """The Callpoint is a lightweight object used to represent a single
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52 entry in the code of a call stack. It stores the code-related
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53 metadata of a given frame. Available attributes are the same as
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54 the parameters below.
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55
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56 Args:
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57 func_name (str): the function name
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58 lineno (int): the line number
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59 module_name (str): the module name
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60 module_path (str): the filesystem path of the module
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61 lasti (int): the index of bytecode execution
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62 line (str): the single-line code content (if available)
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63
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64 """
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65 __slots__ = ('func_name', 'lineno', 'module_name', 'module_path', 'lasti',
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66 'line')
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67
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68 def __init__(self, module_name, module_path, func_name,
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69 lineno, lasti, line=None):
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70 self.func_name = func_name
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71 self.lineno = lineno
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72 self.module_name = module_name
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73 self.module_path = module_path
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74 self.lasti = lasti
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75 self.line = line
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76
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77 def to_dict(self):
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78 "Get a :class:`dict` copy of the Callpoint. Useful for serialization."
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79 ret = {}
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80 for slot in self.__slots__:
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81 try:
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82 val = getattr(self, slot)
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83 except AttributeError:
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84 pass
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85 else:
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86 ret[slot] = str(val) if isinstance(val, _DeferredLine) else val
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87 return ret
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88
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89 @classmethod
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90 def from_current(cls, level=1):
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91 "Creates a Callpoint from the location of the calling function."
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92 frame = sys._getframe(level)
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93 return cls.from_frame(frame)
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94
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95 @classmethod
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96 def from_frame(cls, frame):
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97 "Create a Callpoint object from data extracted from the given frame."
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98 func_name = frame.f_code.co_name
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99 lineno = frame.f_lineno
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100 module_name = frame.f_globals.get('__name__', '')
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101 module_path = frame.f_code.co_filename
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102 lasti = frame.f_lasti
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103 line = _DeferredLine(module_path, lineno, frame.f_globals)
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104 return cls(module_name, module_path, func_name,
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105 lineno, lasti, line=line)
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106
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107 @classmethod
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108 def from_tb(cls, tb):
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109 """Create a Callpoint from the traceback of the current
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110 exception. Main difference with :meth:`from_frame` is that
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111 ``lineno`` and ``lasti`` come from the traceback, which is to
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112 say the line that failed in the try block, not the line
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113 currently being executed (in the except block).
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114 """
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115 func_name = tb.tb_frame.f_code.co_name
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116 lineno = tb.tb_lineno
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117 lasti = tb.tb_lasti
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118 module_name = tb.tb_frame.f_globals.get('__name__', '')
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119 module_path = tb.tb_frame.f_code.co_filename
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120 line = _DeferredLine(module_path, lineno, tb.tb_frame.f_globals)
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121 return cls(module_name, module_path, func_name,
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122 lineno, lasti, line=line)
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123
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124 def __repr__(self):
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125 cn = self.__class__.__name__
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126 args = [getattr(self, s, None) for s in self.__slots__]
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127 if not any(args):
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128 return super(Callpoint, self).__repr__()
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129 else:
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130 return '%s(%s)' % (cn, ', '.join([repr(a) for a in args]))
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131
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132 def tb_frame_str(self):
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133 """Render the Callpoint as it would appear in a standard printed
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134 Python traceback. Returns a string with filename, line number,
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135 function name, and the actual code line of the error on up to
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136 two lines.
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137 """
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138 ret = ' File "%s", line %s, in %s\n' % (self.module_path,
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139 self.lineno,
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140 self.func_name)
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141 if self.line:
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142 ret += ' %s\n' % (str(self.line).strip(),)
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143 return ret
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144
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145
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146 class _DeferredLine(object):
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147 """The _DeferredLine type allows Callpoints and TracebackInfos to be
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148 constructed without potentially hitting the filesystem, as is the
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149 normal behavior of the standard Python :mod:`traceback` and
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150 :mod:`linecache` modules. Calling :func:`str` fetches and caches
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151 the line.
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152
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153 Args:
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154 filename (str): the path of the file containing the line
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155 lineno (int): the number of the line in question
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156 module_globals (dict): an optional dict of module globals,
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157 used to handle advanced use cases using custom module loaders.
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158
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159 """
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160 __slots__ = ('filename', 'lineno', '_line', '_mod_name', '_mod_loader')
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161
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162 def __init__(self, filename, lineno, module_globals=None):
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163 self.filename = filename
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164 self.lineno = lineno
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165 # TODO: this is going away when we fix linecache
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166 # TODO: (mark) read about loader
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167 if module_globals is None:
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168 self._mod_name = None
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169 self._mod_loader = None
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170 else:
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171 self._mod_name = module_globals.get('__name__')
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172 self._mod_loader = module_globals.get('__loader__')
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173
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174 def __eq__(self, other):
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175 return (self.lineno, self.filename) == (other.lineno, other.filename)
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176
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177 def __ne__(self, other):
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178 return not self == other
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179
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180 def __str__(self):
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181 ret = getattr(self, '_line', None)
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182 if ret is not None:
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183 return ret
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184 try:
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185 linecache.checkcache(self.filename)
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186 mod_globals = {'__name__': self._mod_name,
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187 '__loader__': self._mod_loader}
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188 line = linecache.getline(self.filename,
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189 self.lineno,
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190 mod_globals)
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191 line = line.rstrip()
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192 except KeyError:
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193 line = ''
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194 self._line = line
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195 return line
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196
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197 def __repr__(self):
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198 return repr(str(self))
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199
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200 def __len__(self):
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201 return len(str(self))
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202
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203
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204 # TODO: dedup frames, look at __eq__ on _DeferredLine
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205 class TracebackInfo(object):
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206 """The TracebackInfo class provides a basic representation of a stack
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207 trace, be it from an exception being handled or just part of
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208 normal execution. It is basically a wrapper around a list of
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209 :class:`Callpoint` objects representing frames.
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210
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211 Args:
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212 frames (list): A list of frame objects in the stack.
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213
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214 .. note ::
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215
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216 ``TracebackInfo`` can represent both exception tracebacks and
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217 non-exception tracebacks (aka stack traces). As a result, there
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218 is no ``TracebackInfo.from_current()``, as that would be
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219 ambiguous. Instead, call :meth:`TracebackInfo.from_frame`
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220 without the *frame* argument for a stack trace, or
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221 :meth:`TracebackInfo.from_traceback` without the *tb* argument
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222 for an exception traceback.
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223 """
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224 callpoint_type = Callpoint
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225
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226 def __init__(self, frames):
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227 self.frames = frames
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228
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229 @classmethod
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230 def from_frame(cls, frame=None, level=1, limit=None):
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231 """Create a new TracebackInfo *frame* by recurring up in the stack a
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232 max of *limit* times. If *frame* is unset, get the frame from
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233 :func:`sys._getframe` using *level*.
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234
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235 Args:
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236 frame (types.FrameType): frame object from
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237 :func:`sys._getframe` or elsewhere. Defaults to result
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238 of :func:`sys.get_frame`.
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239 level (int): If *frame* is unset, the desired frame is
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240 this many levels up the stack from the invocation of
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241 this method. Default ``1`` (i.e., caller of this method).
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242 limit (int): max number of parent frames to extract
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243 (defaults to :data:`sys.tracebacklimit`)
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244
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245 """
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246 ret = []
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247 if frame is None:
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248 frame = sys._getframe(level)
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249 if limit is None:
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250 limit = getattr(sys, 'tracebacklimit', 1000)
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251 n = 0
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252 while frame is not None and n < limit:
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253 item = cls.callpoint_type.from_frame(frame)
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254 ret.append(item)
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255 frame = frame.f_back
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256 n += 1
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257 ret.reverse()
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258 return cls(ret)
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259
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260 @classmethod
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261 def from_traceback(cls, tb=None, limit=None):
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262 """Create a new TracebackInfo from the traceback *tb* by recurring
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263 up in the stack a max of *limit* times. If *tb* is unset, get
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264 the traceback from the currently handled exception. If no
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265 exception is being handled, raise a :exc:`ValueError`.
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266
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267 Args:
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268
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269 frame (types.TracebackType): traceback object from
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270 :func:`sys.exc_info` or elsewhere. If absent or set to
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271 ``None``, defaults to ``sys.exc_info()[2]``, and
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272 raises a :exc:`ValueError` if no exception is
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273 currently being handled.
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274 limit (int): max number of parent frames to extract
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275 (defaults to :data:`sys.tracebacklimit`)
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276
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277 """
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278 ret = []
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279 if tb is None:
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280 tb = sys.exc_info()[2]
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281 if tb is None:
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282 raise ValueError('no tb set and no exception being handled')
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283 if limit is None:
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284 limit = getattr(sys, 'tracebacklimit', 1000)
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285 n = 0
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286 while tb is not None and n < limit:
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287 item = cls.callpoint_type.from_tb(tb)
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288 ret.append(item)
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289 tb = tb.tb_next
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290 n += 1
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291 return cls(ret)
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292
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293 @classmethod
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294 def from_dict(cls, d):
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295 "Complements :meth:`TracebackInfo.to_dict`."
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296 # TODO: check this.
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297 return cls(d['frames'])
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298
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299 def to_dict(self):
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300 """Returns a dict with a list of :class:`Callpoint` frames converted
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301 to dicts.
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302 """
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303 return {'frames': [f.to_dict() for f in self.frames]}
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304
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305 def __len__(self):
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306 return len(self.frames)
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307
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308 def __iter__(self):
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309 return iter(self.frames)
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310
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311 def __repr__(self):
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312 cn = self.__class__.__name__
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313
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314 if self.frames:
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315 frame_part = ' last=%r' % (self.frames[-1],)
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316 else:
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317 frame_part = ''
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318
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319 return '<%s frames=%s%s>' % (cn, len(self.frames), frame_part)
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320
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321 def __str__(self):
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322 return self.get_formatted()
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323
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324 def get_formatted(self):
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325 """Returns a string as formatted in the traditional Python
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326 built-in style observable when an exception is not caught. In
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327 other words, mimics :func:`traceback.format_tb` and
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328 :func:`traceback.format_stack`.
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329 """
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330 ret = 'Traceback (most recent call last):\n'
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331 ret += ''.join([f.tb_frame_str() for f in self.frames])
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332 return ret
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333
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334
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335 class ExceptionInfo(object):
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336 """An ExceptionInfo object ties together three main fields suitable
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337 for representing an instance of an exception: The exception type
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338 name, a string representation of the exception itself (the
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339 exception message), and information about the traceback (stored as
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340 a :class:`TracebackInfo` object).
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341
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342 These fields line up with :func:`sys.exc_info`, but unlike the
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343 values returned by that function, ExceptionInfo does not hold any
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344 references to the real exception or traceback. This property makes
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345 it suitable for serialization or long-term retention, without
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346 worrying about formatting pitfalls, circular references, or leaking memory.
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347
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348 Args:
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349
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350 exc_type (str): The exception type name.
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351 exc_msg (str): String representation of the exception value.
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352 tb_info (TracebackInfo): Information about the stack trace of the
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353 exception.
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354
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355 Like the :class:`TracebackInfo`, ExceptionInfo is most commonly
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356 instantiated from one of its classmethods: :meth:`from_exc_info`
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357 or :meth:`from_current`.
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358 """
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359
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360 #: Override this in inherited types to control the TracebackInfo type used
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361 tb_info_type = TracebackInfo
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362
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363 def __init__(self, exc_type, exc_msg, tb_info):
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364 # TODO: additional fields for SyntaxErrors
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365 self.exc_type = exc_type
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366 self.exc_msg = exc_msg
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367 self.tb_info = tb_info
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368
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369 @classmethod
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370 def from_exc_info(cls, exc_type, exc_value, traceback):
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371 """Create an :class:`ExceptionInfo` object from the exception's type,
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372 value, and traceback, as returned by :func:`sys.exc_info`. See
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373 also :meth:`from_current`.
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374 """
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375 type_str = exc_type.__name__
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376 type_mod = exc_type.__module__
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377 if type_mod not in ("__main__", "__builtin__", "exceptions", "builtins"):
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378 type_str = '%s.%s' % (type_mod, type_str)
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379 val_str = _some_str(exc_value)
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380 tb_info = cls.tb_info_type.from_traceback(traceback)
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381 return cls(type_str, val_str, tb_info)
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382
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383 @classmethod
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384 def from_current(cls):
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385 """Create an :class:`ExceptionInfo` object from the current exception
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386 being handled, by way of :func:`sys.exc_info`. Will raise an
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387 exception if no exception is currently being handled.
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388 """
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389 return cls.from_exc_info(*sys.exc_info())
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390
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391 def to_dict(self):
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392 """Get a :class:`dict` representation of the ExceptionInfo, suitable
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393 for JSON serialization.
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394 """
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395 return {'exc_type': self.exc_type,
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396 'exc_msg': self.exc_msg,
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397 'exc_tb': self.tb_info.to_dict()}
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398
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399 def __repr__(self):
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400 cn = self.__class__.__name__
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401 try:
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402 len_frames = len(self.tb_info.frames)
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403 last_frame = ', last=%r' % (self.tb_info.frames[-1],)
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404 except Exception:
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405 len_frames = 0
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406 last_frame = ''
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407 args = (cn, self.exc_type, self.exc_msg, len_frames, last_frame)
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408 return '<%s [%s: %s] (%s frames%s)>' % args
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409
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410 def get_formatted(self):
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411 """Returns a string formatted in the traditional Python
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412 built-in style observable when an exception is not caught. In
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413 other words, mimics :func:`traceback.format_exception`.
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414 """
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415 # TODO: add SyntaxError formatting
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416 tb_str = self.tb_info.get_formatted()
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417 return ''.join([tb_str, '%s: %s' % (self.exc_type, self.exc_msg)])
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418
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419 def get_formatted_exception_only(self):
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420 return '%s: %s' % (self.exc_type, self.exc_msg)
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421
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422
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423 class ContextualCallpoint(Callpoint):
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424 """The ContextualCallpoint is a :class:`Callpoint` subtype with the
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425 exact same API and storing two additional values:
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426
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427 1. :func:`repr` outputs for local variables from the Callpoint's scope
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428 2. A number of lines before and after the Callpoint's line of code
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429
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430 The ContextualCallpoint is used by the :class:`ContextualTracebackInfo`.
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431 """
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432 def __init__(self, *a, **kw):
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433 self.local_reprs = kw.pop('local_reprs', {})
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434 self.pre_lines = kw.pop('pre_lines', [])
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435 self.post_lines = kw.pop('post_lines', [])
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436 super(ContextualCallpoint, self).__init__(*a, **kw)
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437
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438 @classmethod
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439 def from_frame(cls, frame):
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440 "Identical to :meth:`Callpoint.from_frame`"
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441 ret = super(ContextualCallpoint, cls).from_frame(frame)
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442 ret._populate_local_reprs(frame.f_locals)
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443 ret._populate_context_lines()
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444 return ret
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445
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446 @classmethod
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parents:
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447 def from_tb(cls, tb):
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448 "Identical to :meth:`Callpoint.from_tb`"
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449 ret = super(ContextualCallpoint, cls).from_tb(tb)
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450 ret._populate_local_reprs(tb.tb_frame.f_locals)
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451 ret._populate_context_lines()
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452 return ret
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453
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454 def _populate_context_lines(self, pivot=8):
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455 DL, lineno = _DeferredLine, self.lineno
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456 try:
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457 module_globals = self.line.module_globals
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parents:
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458 except Exception:
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459 module_globals = None
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parents:
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460 start_line = max(0, lineno - pivot)
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parents:
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461 pre_lines = [DL(self.module_path, ln, module_globals)
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parents:
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462 for ln in range(start_line, lineno)]
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parents:
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463 self.pre_lines[:] = pre_lines
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parents:
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464 post_lines = [DL(self.module_path, ln, module_globals)
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parents:
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465 for ln in range(lineno + 1, lineno + 1 + pivot)]
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parents:
diff changeset
466 self.post_lines[:] = post_lines
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467 return
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468
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parents:
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469 def _populate_local_reprs(self, f_locals):
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470 local_reprs = self.local_reprs
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parents:
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471 for k, v in f_locals.items():
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472 try:
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473 local_reprs[k] = repr(v)
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parents:
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474 except Exception:
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parents:
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475 surrogate = '<unprintable %s object>' % type(v).__name__
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parents:
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476 local_reprs[k] = surrogate
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parents:
diff changeset
477 return
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parents:
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478
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479 def to_dict(self):
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480 """
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diff changeset
481 Same principle as :meth:`Callpoint.to_dict`, but with the added
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
482 contextual values. With ``ContextualCallpoint.to_dict()``,
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parents:
diff changeset
483 each frame will now be represented like::
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484
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parents:
diff changeset
485 {'func_name': 'print_example',
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parents:
diff changeset
486 'lineno': 0,
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487 'module_name': 'example_module',
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488 'module_path': '/home/example/example_module.pyc',
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parents:
diff changeset
489 'lasti': 0,
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490 'line': 'print "example"',
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491 'locals': {'variable': '"value"'},
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parents:
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492 'pre_lines': ['variable = "value"'],
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parents:
diff changeset
493 'post_lines': []}
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parents:
diff changeset
494
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parents:
diff changeset
495 The locals dictionary and line lists are copies and can be mutated
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diff changeset
496 freely.
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497 """
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498 ret = super(ContextualCallpoint, self).to_dict()
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parents:
diff changeset
499 ret['locals'] = dict(self.local_reprs)
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parents:
diff changeset
500
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parents:
diff changeset
501 # get the line numbers and textual lines
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parents:
diff changeset
502 # without assuming DeferredLines
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parents:
diff changeset
503 start_line = self.lineno - len(self.pre_lines)
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parents:
diff changeset
504 pre_lines = [{'lineno': start_line + i, 'line': str(l)}
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parents:
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505 for i, l in enumerate(self.pre_lines)]
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parents:
diff changeset
506 # trim off leading empty lines
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507 for i, item in enumerate(pre_lines):
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parents:
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508 if item['line']:
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diff changeset
509 break
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
510 if i:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
511 pre_lines = pre_lines[i:]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
512 ret['pre_lines'] = pre_lines
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
513
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
514 # now post_lines
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
515 post_lines = [{'lineno': self.lineno + i, 'line': str(l)}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
516 for i, l in enumerate(self.post_lines)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
517 _last = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
518 for i, item in enumerate(post_lines):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
519 if item['line']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
520 _last = i
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
521 post_lines = post_lines[:_last + 1]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
522 ret['post_lines'] = post_lines
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
523 return ret
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
524
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
525
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
526 class ContextualTracebackInfo(TracebackInfo):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
527 """The ContextualTracebackInfo type is a :class:`TracebackInfo`
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
528 subtype that is used by :class:`ContextualExceptionInfo` and uses
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
529 the :class:`ContextualCallpoint` as its frame-representing
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
530 primitive.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
531 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
532 callpoint_type = ContextualCallpoint
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
533
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
534
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
535 class ContextualExceptionInfo(ExceptionInfo):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
536 """The ContextualTracebackInfo type is a :class:`TracebackInfo`
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
537 subtype that uses the :class:`ContextualCallpoint` as its
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
538 frame-representing primitive.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
539
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
540 It carries with it most of the exception information required to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
541 recreate the widely recognizable "500" page for debugging Django
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
542 applications.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
543 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
544 tb_info_type = ContextualTracebackInfo
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
545
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
546
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
547 # TODO: clean up & reimplement -- specifically for syntax errors
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
548 def format_exception_only(etype, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
549 """Format the exception part of a traceback.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
550
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
551 The arguments are the exception type and value such as given by
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
552 sys.last_type and sys.last_value. The return value is a list of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
553 strings, each ending in a newline.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
554
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
555 Normally, the list contains a single string; however, for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
556 SyntaxError exceptions, it contains several lines that (when
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
557 printed) display detailed information about where the syntax
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
558 error occurred.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
559
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
560 The message indicating which exception occurred is always the last
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
561 string in the list.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
562
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
563 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
564 # Gracefully handle (the way Python 2.4 and earlier did) the case of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
565 # being called with (None, None).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
566 if etype is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
567 return [_format_final_exc_line(etype, value)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
568
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
569 stype = etype.__name__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
570 smod = etype.__module__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
571 if smod not in ("__main__", "builtins", "exceptions"):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
572 stype = smod + '.' + stype
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
573
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
574 if not issubclass(etype, SyntaxError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
575 return [_format_final_exc_line(stype, value)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
576
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
577 # It was a syntax error; show exactly where the problem was found.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
578 lines = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
579 filename = value.filename or "<string>"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
580 lineno = str(value.lineno) or '?'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
581 lines.append(' File "%s", line %s\n' % (filename, lineno))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
582 badline = value.text
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
583 offset = value.offset
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
584 if badline is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
585 lines.append(' %s\n' % badline.strip())
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
586 if offset is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
587 caretspace = badline.rstrip('\n')[:offset].lstrip()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
588 # non-space whitespace (likes tabs) must be kept for alignment
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
589 caretspace = ((c.isspace() and c or ' ') for c in caretspace)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
590 # only three spaces to account for offset1 == pos 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
591 lines.append(' %s^\n' % ''.join(caretspace))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
592 msg = value.msg or "<no detail available>"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
593 lines.append("%s: %s\n" % (stype, msg))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
594 return lines
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
595
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
596
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
597 # TODO: use asciify, improved if necessary
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
598 def _some_str(value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
599 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
600 return str(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
601 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
602 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
603 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
604 value = text(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
605 return value.encode("ascii", "backslashreplace")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
606 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
607 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
608 return '<unprintable %s object>' % type(value).__name__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
609
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
610
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
611 def _format_final_exc_line(etype, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
612 valuestr = _some_str(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
613 if value is None or not valuestr:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
614 line = "%s\n" % etype
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
615 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
616 line = "%s: %s\n" % (etype, valuestr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
617 return line
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
618
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
619
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
620 def print_exception(etype, value, tb, limit=None, file=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
621 """Print exception up to 'limit' stack trace entries from 'tb' to 'file'.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
622
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
623 This differs from print_tb() in the following ways: (1) if
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
624 traceback is not None, it prints a header "Traceback (most recent
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
625 call last):"; (2) it prints the exception type and value after the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
626 stack trace; (3) if type is SyntaxError and value has the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
627 appropriate format, it prints the line where the syntax error
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
628 occurred with a caret on the next line indicating the approximate
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
629 position of the error.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
630 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
631
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
632 if file is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
633 file = sys.stderr
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
634 if tb:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
635 tbi = TracebackInfo.from_traceback(tb, limit)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
636 print(str(tbi), end='', file=file)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
637
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
638 for line in format_exception_only(etype, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
639 print(line, end='', file=file)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
640
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
641
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
642 def fix_print_exception():
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
643 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
644 Sets the default exception hook :func:`sys.excepthook` to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
645 :func:`tbutils.print_exception` that uses all the ``tbutils``
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
646 facilities to provide slightly more correct output behavior.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
647 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
648 sys.excepthook = print_exception
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
649
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
650
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
651 _frame_re = re.compile(r'^File "(?P<filepath>.+)", line (?P<lineno>\d+)'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
652 r', in (?P<funcname>.+)$')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
653 _se_frame_re = re.compile(r'^File "(?P<filepath>.+)", line (?P<lineno>\d+)')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
654
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
655
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
656 # TODO: ParsedException generator over large bodies of text
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
657
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
658 class ParsedException(object):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
659 """Stores a parsed traceback and exception as would be typically
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
660 output by :func:`sys.excepthook` or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
661 :func:`traceback.print_exception`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
662
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
663 .. note:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
664
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
665 Does not currently store SyntaxError details such as column.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
666
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
667 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
668 def __init__(self, exc_type_name, exc_msg, frames=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
669 self.exc_type = exc_type_name
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
670 self.exc_msg = exc_msg
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
671 self.frames = list(frames or [])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
672
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
673 @property
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
674 def source_file(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
675 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
676 The file path of module containing the function that raised the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
677 exception, or None if not available.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
678 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
679 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
680 return self.frames[-1]['filepath']
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
681 except IndexError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
682 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
683
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
684 def to_dict(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
685 "Get a copy as a JSON-serializable :class:`dict`."
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
686 return {'exc_type': self.exc_type,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
687 'exc_msg': self.exc_msg,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
688 'frames': list(self.frames)}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
689
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
690 def __repr__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
691 cn = self.__class__.__name__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
692 return ('%s(%r, %r, frames=%r)'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
693 % (cn, self.exc_type, self.exc_msg, self.frames))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
694
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
695 def to_string(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
696 """Formats the exception and its traceback into the standard format,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
697 as returned by the traceback module.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
698
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
699 ``ParsedException.from_string(text).to_string()`` should yield
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
700 ``text``.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
701 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
702 lines = [u'Traceback (most recent call last):']
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
703
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
704 for frame in self.frames:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
705 lines.append(u' File "%s", line %s, in %s' % (frame['filepath'],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
706 frame['lineno'],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
707 frame['funcname']))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
708 source_line = frame.get('source_line')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
709 if source_line:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
710 lines.append(u' %s' % (source_line,))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
711 if self.exc_msg:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
712 lines.append(u'%s: %s' % (self.exc_type, self.exc_msg))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
713 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
714 lines.append(u'%s' % (self.exc_type,))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
715 return u'\n'.join(lines)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
716
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
717 @classmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
718 def from_string(cls, tb_str):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
719 """Parse a traceback and exception from the text *tb_str*. This text
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
720 is expected to have been decoded, otherwise it will be
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
721 interpreted as UTF-8.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
722
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
723 This method does not search a larger body of text for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
724 tracebacks. If the first line of the text passed does not
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
725 match one of the known patterns, a :exc:`ValueError` will be
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
726 raised. This method will ignore trailing text after the end of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
727 the first traceback.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
728
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
729 Args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
730 tb_str (str): The traceback text (:class:`unicode` or UTF-8 bytes)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
731 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
732 if not isinstance(tb_str, text):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
733 tb_str = tb_str.decode('utf-8')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
734 tb_lines = tb_str.lstrip().splitlines()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
735
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
736 # First off, handle some ignored exceptions. These can be the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
737 # result of exceptions raised by __del__ during garbage
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
738 # collection
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
739 while tb_lines:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
740 cl = tb_lines[-1]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
741 if cl.startswith('Exception ') and cl.endswith('ignored'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
742 tb_lines.pop()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
743 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
744 break
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
745 if tb_lines and tb_lines[0].strip() == 'Traceback (most recent call last):':
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
746 start_line = 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
747 frame_re = _frame_re
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
748 elif len(tb_lines) > 1 and tb_lines[-2].lstrip().startswith('^'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
749 # This is to handle the slight formatting difference
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
750 # associated with SyntaxErrors, which also don't really
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
751 # have tracebacks
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
752 start_line = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
753 frame_re = _se_frame_re
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
754 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
755 raise ValueError('unrecognized traceback string format')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
756
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
757 frames = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
758 line_no = start_line
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
759 while True:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
760 frame_line = tb_lines[line_no].strip()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
761 frame_match = frame_re.match(frame_line)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
762 if frame_match:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
763 frame_dict = frame_match.groupdict()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
764 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
765 next_line = tb_lines[line_no + 1]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
766 except IndexError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
767 # We read what we could
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
768 next_line = ''
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
769 next_line_stripped = next_line.strip()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
770 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
771 frame_re.match(next_line_stripped) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
772 # The exception message will not be indented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
773 # This check is to avoid overrunning on eval-like
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
774 # tracebacks where the last frame doesn't have source
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
775 # code in the traceback
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
776 not next_line.startswith(' ')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
777 ):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
778 frame_dict['source_line'] = ''
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
779 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
780 frame_dict['source_line'] = next_line_stripped
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
781 line_no += 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
782 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
783 break
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 line_no += 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
785 frames.append(frame_dict)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
786
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
787 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
788 exc_line = '\n'.join(tb_lines[line_no:])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
789 exc_type, _, exc_msg = exc_line.partition(': ')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
790 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
791 exc_type, exc_msg = '', ''
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
792
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
793 return cls(exc_type, exc_msg, frames)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
794
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
795
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
796 ParsedTB = ParsedException # legacy alias