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0085c3ae8f
Only include underscored names in name suggestions for AttributeError and ImportError if the original name was underscored.
1604 lines
63 KiB
Python
1604 lines
63 KiB
Python
"""Extract, format and print information about Python stack traces."""
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import collections.abc
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import itertools
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import linecache
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import sys
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import textwrap
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import warnings
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from contextlib import suppress
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import _colorize
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from _colorize import ANSIColors
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__all__ = ['extract_stack', 'extract_tb', 'format_exception',
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'format_exception_only', 'format_list', 'format_stack',
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'format_tb', 'print_exc', 'format_exc', 'print_exception',
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'print_last', 'print_stack', 'print_tb', 'clear_frames',
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'FrameSummary', 'StackSummary', 'TracebackException',
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'walk_stack', 'walk_tb']
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#
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# Formatting and printing lists of traceback lines.
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#
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def print_list(extracted_list, file=None):
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"""Print the list of tuples as returned by extract_tb() or
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extract_stack() as a formatted stack trace to the given file."""
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if file is None:
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file = sys.stderr
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for item in StackSummary.from_list(extracted_list).format():
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print(item, file=file, end="")
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def format_list(extracted_list):
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"""Format a list of tuples or FrameSummary objects for printing.
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Given a list of tuples or FrameSummary objects as returned by
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extract_tb() or extract_stack(), return a list of strings ready
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for printing.
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Each string in the resulting list corresponds to the item with the
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same index in the argument list. Each string ends in a newline;
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the strings may contain internal newlines as well, for those items
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whose source text line is not None.
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"""
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return StackSummary.from_list(extracted_list).format()
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#
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# Printing and Extracting Tracebacks.
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#
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def print_tb(tb, limit=None, file=None):
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"""Print up to 'limit' stack trace entries from the traceback 'tb'.
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If 'limit' is omitted or None, all entries are printed. If 'file'
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is omitted or None, the output goes to sys.stderr; otherwise
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'file' should be an open file or file-like object with a write()
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method.
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"""
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print_list(extract_tb(tb, limit=limit), file=file)
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def format_tb(tb, limit=None):
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"""A shorthand for 'format_list(extract_tb(tb, limit))'."""
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return extract_tb(tb, limit=limit).format()
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def extract_tb(tb, limit=None):
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"""
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Return a StackSummary object representing a list of
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pre-processed entries from traceback.
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This is useful for alternate formatting of stack traces. If
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'limit' is omitted or None, all entries are extracted. A
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pre-processed stack trace entry is a FrameSummary object
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containing attributes filename, lineno, name, and line
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representing the information that is usually printed for a stack
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trace. The line is a string with leading and trailing
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whitespace stripped; if the source is not available it is None.
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"""
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return StackSummary._extract_from_extended_frame_gen(
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_walk_tb_with_full_positions(tb), limit=limit)
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#
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# Exception formatting and output.
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#
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_cause_message = (
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"\nThe above exception was the direct cause "
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"of the following exception:\n\n")
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_context_message = (
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"\nDuring handling of the above exception, "
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"another exception occurred:\n\n")
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class _Sentinel:
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def __repr__(self):
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return "<implicit>"
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_sentinel = _Sentinel()
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def _parse_value_tb(exc, value, tb):
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if (value is _sentinel) != (tb is _sentinel):
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raise ValueError("Both or neither of value and tb must be given")
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if value is tb is _sentinel:
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if exc is not None:
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if isinstance(exc, BaseException):
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return exc, exc.__traceback__
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raise TypeError(f'Exception expected for value, '
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f'{type(exc).__name__} found')
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else:
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return None, None
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return value, tb
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def print_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \
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file=None, chain=True, **kwargs):
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"""Print exception up to 'limit' stack trace entries from 'tb' to 'file'.
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This differs from print_tb() in the following ways: (1) if
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traceback is not None, it prints a header "Traceback (most recent
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call last):"; (2) it prints the exception type and value after the
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stack trace; (3) if type is SyntaxError and value has the
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appropriate format, it prints the line where the syntax error
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occurred with a caret on the next line indicating the approximate
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position of the error.
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"""
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colorize = kwargs.get("colorize", False)
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value, tb = _parse_value_tb(exc, value, tb)
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te = TracebackException(type(value), value, tb, limit=limit, compact=True)
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te.print(file=file, chain=chain, colorize=colorize)
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BUILTIN_EXCEPTION_LIMIT = object()
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def _print_exception_bltin(exc, /):
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file = sys.stderr if sys.stderr is not None else sys.__stderr__
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colorize = _colorize.can_colorize()
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return print_exception(exc, limit=BUILTIN_EXCEPTION_LIMIT, file=file, colorize=colorize)
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def format_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \
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chain=True, **kwargs):
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"""Format a stack trace and the exception information.
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The arguments have the same meaning as the corresponding arguments
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to print_exception(). The return value is a list of strings, each
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ending in a newline and some containing internal newlines. When
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these lines are concatenated and printed, exactly the same text is
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printed as does print_exception().
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"""
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colorize = kwargs.get("colorize", False)
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value, tb = _parse_value_tb(exc, value, tb)
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te = TracebackException(type(value), value, tb, limit=limit, compact=True)
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return list(te.format(chain=chain, colorize=colorize))
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def format_exception_only(exc, /, value=_sentinel, *, show_group=False):
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"""Format the exception part of a traceback.
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The return value is a list of strings, each ending in a newline.
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The list contains the exception's message, which is
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normally a single string; however, for :exc:`SyntaxError` exceptions, it
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contains several lines that (when printed) display detailed information
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about where the syntax error occurred. Following the message, the list
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contains the exception's ``__notes__``.
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When *show_group* is ``True``, and the exception is an instance of
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:exc:`BaseExceptionGroup`, the nested exceptions are included as
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well, recursively, with indentation relative to their nesting depth.
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"""
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if value is _sentinel:
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value = exc
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te = TracebackException(type(value), value, None, compact=True)
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return list(te.format_exception_only(show_group=show_group))
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# -- not official API but folk probably use these two functions.
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def _format_final_exc_line(etype, value, *, insert_final_newline=True, colorize=False):
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valuestr = _safe_string(value, 'exception')
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end_char = "\n" if insert_final_newline else ""
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if colorize:
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if value is None or not valuestr:
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line = f"{ANSIColors.BOLD_MAGENTA}{etype}{ANSIColors.RESET}{end_char}"
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else:
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line = f"{ANSIColors.BOLD_MAGENTA}{etype}{ANSIColors.RESET}: {ANSIColors.MAGENTA}{valuestr}{ANSIColors.RESET}{end_char}"
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else:
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if value is None or not valuestr:
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line = f"{etype}{end_char}"
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else:
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line = f"{etype}: {valuestr}{end_char}"
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return line
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def _safe_string(value, what, func=str):
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try:
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return func(value)
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except:
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return f'<{what} {func.__name__}() failed>'
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# --
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def print_exc(limit=None, file=None, chain=True):
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"""Shorthand for 'print_exception(sys.exception(), limit, file, chain)'."""
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print_exception(sys.exception(), limit=limit, file=file, chain=chain)
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def format_exc(limit=None, chain=True):
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"""Like print_exc() but return a string."""
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return "".join(format_exception(sys.exception(), limit=limit, chain=chain))
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def print_last(limit=None, file=None, chain=True):
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"""This is a shorthand for 'print_exception(sys.last_exc, limit, file, chain)'."""
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if not hasattr(sys, "last_exc") and not hasattr(sys, "last_type"):
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raise ValueError("no last exception")
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if hasattr(sys, "last_exc"):
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print_exception(sys.last_exc, limit, file, chain)
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else:
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print_exception(sys.last_type, sys.last_value, sys.last_traceback,
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limit, file, chain)
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#
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# Printing and Extracting Stacks.
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#
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def print_stack(f=None, limit=None, file=None):
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"""Print a stack trace from its invocation point.
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The optional 'f' argument can be used to specify an alternate
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stack frame at which to start. The optional 'limit' and 'file'
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arguments have the same meaning as for print_exception().
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"""
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if f is None:
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f = sys._getframe().f_back
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print_list(extract_stack(f, limit=limit), file=file)
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def format_stack(f=None, limit=None):
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"""Shorthand for 'format_list(extract_stack(f, limit))'."""
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if f is None:
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f = sys._getframe().f_back
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return format_list(extract_stack(f, limit=limit))
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def extract_stack(f=None, limit=None):
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"""Extract the raw traceback from the current stack frame.
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The return value has the same format as for extract_tb(). The
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optional 'f' and 'limit' arguments have the same meaning as for
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print_stack(). Each item in the list is a quadruple (filename,
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line number, function name, text), and the entries are in order
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from oldest to newest stack frame.
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"""
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if f is None:
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f = sys._getframe().f_back
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stack = StackSummary.extract(walk_stack(f), limit=limit)
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stack.reverse()
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return stack
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def clear_frames(tb):
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"Clear all references to local variables in the frames of a traceback."
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while tb is not None:
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try:
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tb.tb_frame.clear()
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except RuntimeError:
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# Ignore the exception raised if the frame is still executing.
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pass
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tb = tb.tb_next
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class FrameSummary:
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"""Information about a single frame from a traceback.
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- :attr:`filename` The filename for the frame.
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- :attr:`lineno` The line within filename for the frame that was
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active when the frame was captured.
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- :attr:`name` The name of the function or method that was executing
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when the frame was captured.
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- :attr:`line` The text from the linecache module for the
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of code that was running when the frame was captured.
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- :attr:`locals` Either None if locals were not supplied, or a dict
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mapping the name to the repr() of the variable.
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"""
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__slots__ = ('filename', 'lineno', 'end_lineno', 'colno', 'end_colno',
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'name', '_lines', '_lines_dedented', 'locals')
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def __init__(self, filename, lineno, name, *, lookup_line=True,
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locals=None, line=None,
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end_lineno=None, colno=None, end_colno=None):
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"""Construct a FrameSummary.
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:param lookup_line: If True, `linecache` is consulted for the source
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code line. Otherwise, the line will be looked up when first needed.
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:param locals: If supplied the frame locals, which will be captured as
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object representations.
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:param line: If provided, use this instead of looking up the line in
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the linecache.
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"""
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self.filename = filename
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self.lineno = lineno
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self.end_lineno = lineno if end_lineno is None else end_lineno
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self.colno = colno
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self.end_colno = end_colno
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self.name = name
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self._lines = line
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self._lines_dedented = None
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if lookup_line:
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self.line
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self.locals = {k: _safe_string(v, 'local', func=repr)
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for k, v in locals.items()} if locals else None
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def __eq__(self, other):
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if isinstance(other, FrameSummary):
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return (self.filename == other.filename and
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self.lineno == other.lineno and
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self.name == other.name and
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self.locals == other.locals)
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if isinstance(other, tuple):
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return (self.filename, self.lineno, self.name, self.line) == other
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return NotImplemented
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def __getitem__(self, pos):
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return (self.filename, self.lineno, self.name, self.line)[pos]
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def __iter__(self):
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return iter([self.filename, self.lineno, self.name, self.line])
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def __repr__(self):
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return "<FrameSummary file {filename}, line {lineno} in {name}>".format(
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filename=self.filename, lineno=self.lineno, name=self.name)
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def __len__(self):
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return 4
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def _set_lines(self):
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if (
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self._lines is None
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and self.lineno is not None
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and self.end_lineno is not None
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):
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lines = []
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for lineno in range(self.lineno, self.end_lineno + 1):
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# treat errors (empty string) and empty lines (newline) as the same
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lines.append(linecache.getline(self.filename, lineno).rstrip())
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self._lines = "\n".join(lines) + "\n"
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@property
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def _original_lines(self):
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# Returns the line as-is from the source, without modifying whitespace.
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self._set_lines()
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return self._lines
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@property
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def _dedented_lines(self):
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# Returns _original_lines, but dedented
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self._set_lines()
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if self._lines_dedented is None and self._lines is not None:
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self._lines_dedented = textwrap.dedent(self._lines)
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return self._lines_dedented
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@property
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def line(self):
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self._set_lines()
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if self._lines is None:
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return None
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# return only the first line, stripped
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return self._lines.partition("\n")[0].strip()
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def walk_stack(f):
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"""Walk a stack yielding the frame and line number for each frame.
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This will follow f.f_back from the given frame. If no frame is given, the
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current stack is used. Usually used with StackSummary.extract.
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"""
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if f is None:
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f = sys._getframe().f_back.f_back.f_back.f_back
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while f is not None:
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yield f, f.f_lineno
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f = f.f_back
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def walk_tb(tb):
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"""Walk a traceback yielding the frame and line number for each frame.
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This will follow tb.tb_next (and thus is in the opposite order to
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walk_stack). Usually used with StackSummary.extract.
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"""
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while tb is not None:
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yield tb.tb_frame, tb.tb_lineno
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tb = tb.tb_next
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def _walk_tb_with_full_positions(tb):
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# Internal version of walk_tb that yields full code positions including
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# end line and column information.
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while tb is not None:
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positions = _get_code_position(tb.tb_frame.f_code, tb.tb_lasti)
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# Yield tb_lineno when co_positions does not have a line number to
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# maintain behavior with walk_tb.
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if positions[0] is None:
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yield tb.tb_frame, (tb.tb_lineno, ) + positions[1:]
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else:
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yield tb.tb_frame, positions
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tb = tb.tb_next
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def _get_code_position(code, instruction_index):
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if instruction_index < 0:
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return (None, None, None, None)
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positions_gen = code.co_positions()
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return next(itertools.islice(positions_gen, instruction_index // 2, None))
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_RECURSIVE_CUTOFF = 3 # Also hardcoded in traceback.c.
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class StackSummary(list):
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"""A list of FrameSummary objects, representing a stack of frames."""
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@classmethod
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def extract(klass, frame_gen, *, limit=None, lookup_lines=True,
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capture_locals=False):
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"""Create a StackSummary from a traceback or stack object.
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:param frame_gen: A generator that yields (frame, lineno) tuples
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whose summaries are to be included in the stack.
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:param limit: None to include all frames or the number of frames to
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include.
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:param lookup_lines: If True, lookup lines for each frame immediately,
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otherwise lookup is deferred until the frame is rendered.
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:param capture_locals: If True, the local variables from each frame will
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be captured as object representations into the FrameSummary.
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"""
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def extended_frame_gen():
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for f, lineno in frame_gen:
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yield f, (lineno, None, None, None)
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return klass._extract_from_extended_frame_gen(
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extended_frame_gen(), limit=limit, lookup_lines=lookup_lines,
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capture_locals=capture_locals)
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@classmethod
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def _extract_from_extended_frame_gen(klass, frame_gen, *, limit=None,
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lookup_lines=True, capture_locals=False):
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# Same as extract but operates on a frame generator that yields
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# (frame, (lineno, end_lineno, colno, end_colno)) in the stack.
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# Only lineno is required, the remaining fields can be None if the
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# information is not available.
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builtin_limit = limit is BUILTIN_EXCEPTION_LIMIT
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if limit is None or builtin_limit:
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limit = getattr(sys, 'tracebacklimit', None)
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if limit is not None and limit < 0:
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limit = 0
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if limit is not None:
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if builtin_limit:
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frame_gen = tuple(frame_gen)
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frame_gen = frame_gen[len(frame_gen) - limit:]
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elif limit >= 0:
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frame_gen = itertools.islice(frame_gen, limit)
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else:
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frame_gen = collections.deque(frame_gen, maxlen=-limit)
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result = klass()
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fnames = set()
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for f, (lineno, end_lineno, colno, end_colno) in frame_gen:
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co = f.f_code
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filename = co.co_filename
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name = co.co_name
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fnames.add(filename)
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linecache.lazycache(filename, f.f_globals)
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# Must defer line lookups until we have called checkcache.
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if capture_locals:
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f_locals = f.f_locals
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else:
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f_locals = None
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result.append(FrameSummary(
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filename, lineno, name, lookup_line=False, locals=f_locals,
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end_lineno=end_lineno, colno=colno, end_colno=end_colno))
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for filename in fnames:
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linecache.checkcache(filename)
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# If immediate lookup was desired, trigger lookups now.
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if lookup_lines:
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for f in result:
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f.line
|
|
return result
|
|
|
|
@classmethod
|
|
def from_list(klass, a_list):
|
|
"""
|
|
Create a StackSummary object from a supplied list of
|
|
FrameSummary objects or old-style list of tuples.
|
|
"""
|
|
# While doing a fast-path check for isinstance(a_list, StackSummary) is
|
|
# appealing, idlelib.run.cleanup_traceback and other similar code may
|
|
# break this by making arbitrary frames plain tuples, so we need to
|
|
# check on a frame by frame basis.
|
|
result = StackSummary()
|
|
for frame in a_list:
|
|
if isinstance(frame, FrameSummary):
|
|
result.append(frame)
|
|
else:
|
|
filename, lineno, name, line = frame
|
|
result.append(FrameSummary(filename, lineno, name, line=line))
|
|
return result
|
|
|
|
def format_frame_summary(self, frame_summary, **kwargs):
|
|
"""Format the lines for a single FrameSummary.
|
|
|
|
Returns a string representing one frame involved in the stack. This
|
|
gets called for every frame to be printed in the stack summary.
|
|
"""
|
|
colorize = kwargs.get("colorize", False)
|
|
row = []
|
|
filename = frame_summary.filename
|
|
if frame_summary.filename.startswith("<stdin>-"):
|
|
filename = "<stdin>"
|
|
if colorize:
|
|
row.append(' File {}"{}"{}, line {}{}{}, in {}{}{}\n'.format(
|
|
ANSIColors.MAGENTA,
|
|
filename,
|
|
ANSIColors.RESET,
|
|
ANSIColors.MAGENTA,
|
|
frame_summary.lineno,
|
|
ANSIColors.RESET,
|
|
ANSIColors.MAGENTA,
|
|
frame_summary.name,
|
|
ANSIColors.RESET,
|
|
)
|
|
)
|
|
else:
|
|
row.append(' File "{}", line {}, in {}\n'.format(
|
|
filename, frame_summary.lineno, frame_summary.name))
|
|
if frame_summary._dedented_lines and frame_summary._dedented_lines.strip():
|
|
if (
|
|
frame_summary.colno is None or
|
|
frame_summary.end_colno is None
|
|
):
|
|
# only output first line if column information is missing
|
|
row.append(textwrap.indent(frame_summary.line, ' ') + "\n")
|
|
else:
|
|
# get first and last line
|
|
all_lines_original = frame_summary._original_lines.splitlines()
|
|
first_line = all_lines_original[0]
|
|
# assume all_lines_original has enough lines (since we constructed it)
|
|
last_line = all_lines_original[frame_summary.end_lineno - frame_summary.lineno]
|
|
|
|
# character index of the start/end of the instruction
|
|
start_offset = _byte_offset_to_character_offset(first_line, frame_summary.colno)
|
|
end_offset = _byte_offset_to_character_offset(last_line, frame_summary.end_colno)
|
|
|
|
all_lines = frame_summary._dedented_lines.splitlines()[
|
|
:frame_summary.end_lineno - frame_summary.lineno + 1
|
|
]
|
|
|
|
# adjust start/end offset based on dedent
|
|
dedent_characters = len(first_line) - len(all_lines[0])
|
|
start_offset = max(0, start_offset - dedent_characters)
|
|
end_offset = max(0, end_offset - dedent_characters)
|
|
|
|
# When showing this on a terminal, some of the non-ASCII characters
|
|
# might be rendered as double-width characters, so we need to take
|
|
# that into account when calculating the length of the line.
|
|
dp_start_offset = _display_width(all_lines[0], offset=start_offset)
|
|
dp_end_offset = _display_width(all_lines[-1], offset=end_offset)
|
|
|
|
# get exact code segment corresponding to the instruction
|
|
segment = "\n".join(all_lines)
|
|
segment = segment[start_offset:len(segment) - (len(all_lines[-1]) - end_offset)]
|
|
|
|
# attempt to parse for anchors
|
|
anchors = None
|
|
show_carets = False
|
|
with suppress(Exception):
|
|
anchors = _extract_caret_anchors_from_line_segment(segment)
|
|
show_carets = self.should_show_carets(start_offset, end_offset, all_lines, anchors)
|
|
|
|
result = []
|
|
|
|
# only display first line, last line, and lines around anchor start/end
|
|
significant_lines = {0, len(all_lines) - 1}
|
|
|
|
anchors_left_end_offset = 0
|
|
anchors_right_start_offset = 0
|
|
primary_char = "^"
|
|
secondary_char = "^"
|
|
if anchors:
|
|
anchors_left_end_offset = anchors.left_end_offset
|
|
anchors_right_start_offset = anchors.right_start_offset
|
|
# computed anchor positions do not take start_offset into account,
|
|
# so account for it here
|
|
if anchors.left_end_lineno == 0:
|
|
anchors_left_end_offset += start_offset
|
|
if anchors.right_start_lineno == 0:
|
|
anchors_right_start_offset += start_offset
|
|
|
|
# account for display width
|
|
anchors_left_end_offset = _display_width(
|
|
all_lines[anchors.left_end_lineno], offset=anchors_left_end_offset
|
|
)
|
|
anchors_right_start_offset = _display_width(
|
|
all_lines[anchors.right_start_lineno], offset=anchors_right_start_offset
|
|
)
|
|
|
|
primary_char = anchors.primary_char
|
|
secondary_char = anchors.secondary_char
|
|
significant_lines.update(
|
|
range(anchors.left_end_lineno - 1, anchors.left_end_lineno + 2)
|
|
)
|
|
significant_lines.update(
|
|
range(anchors.right_start_lineno - 1, anchors.right_start_lineno + 2)
|
|
)
|
|
|
|
# remove bad line numbers
|
|
significant_lines.discard(-1)
|
|
significant_lines.discard(len(all_lines))
|
|
|
|
def output_line(lineno):
|
|
"""output all_lines[lineno] along with carets"""
|
|
result.append(all_lines[lineno] + "\n")
|
|
if not show_carets:
|
|
return
|
|
num_spaces = len(all_lines[lineno]) - len(all_lines[lineno].lstrip())
|
|
carets = []
|
|
num_carets = dp_end_offset if lineno == len(all_lines) - 1 else _display_width(all_lines[lineno])
|
|
# compute caret character for each position
|
|
for col in range(num_carets):
|
|
if col < num_spaces or (lineno == 0 and col < dp_start_offset):
|
|
# before first non-ws char of the line, or before start of instruction
|
|
carets.append(' ')
|
|
elif anchors and (
|
|
lineno > anchors.left_end_lineno or
|
|
(lineno == anchors.left_end_lineno and col >= anchors_left_end_offset)
|
|
) and (
|
|
lineno < anchors.right_start_lineno or
|
|
(lineno == anchors.right_start_lineno and col < anchors_right_start_offset)
|
|
):
|
|
# within anchors
|
|
carets.append(secondary_char)
|
|
else:
|
|
carets.append(primary_char)
|
|
if colorize:
|
|
# Replace the previous line with a red version of it only in the parts covered
|
|
# by the carets.
|
|
line = result[-1]
|
|
colorized_line_parts = []
|
|
colorized_carets_parts = []
|
|
|
|
for color, group in itertools.groupby(itertools.zip_longest(line, carets, fillvalue=""), key=lambda x: x[1]):
|
|
caret_group = list(group)
|
|
if color == "^":
|
|
colorized_line_parts.append(ANSIColors.BOLD_RED + "".join(char for char, _ in caret_group) + ANSIColors.RESET)
|
|
colorized_carets_parts.append(ANSIColors.BOLD_RED + "".join(caret for _, caret in caret_group) + ANSIColors.RESET)
|
|
elif color == "~":
|
|
colorized_line_parts.append(ANSIColors.RED + "".join(char for char, _ in caret_group) + ANSIColors.RESET)
|
|
colorized_carets_parts.append(ANSIColors.RED + "".join(caret for _, caret in caret_group) + ANSIColors.RESET)
|
|
else:
|
|
colorized_line_parts.append("".join(char for char, _ in caret_group))
|
|
colorized_carets_parts.append("".join(caret for _, caret in caret_group))
|
|
|
|
colorized_line = "".join(colorized_line_parts)
|
|
colorized_carets = "".join(colorized_carets_parts)
|
|
result[-1] = colorized_line
|
|
result.append(colorized_carets + "\n")
|
|
else:
|
|
result.append("".join(carets) + "\n")
|
|
|
|
# display significant lines
|
|
sig_lines_list = sorted(significant_lines)
|
|
for i, lineno in enumerate(sig_lines_list):
|
|
if i:
|
|
linediff = lineno - sig_lines_list[i - 1]
|
|
if linediff == 2:
|
|
# 1 line in between - just output it
|
|
output_line(lineno - 1)
|
|
elif linediff > 2:
|
|
# > 1 line in between - abbreviate
|
|
result.append(f"...<{linediff - 1} lines>...\n")
|
|
output_line(lineno)
|
|
|
|
row.append(
|
|
textwrap.indent(textwrap.dedent("".join(result)), ' ', lambda line: True)
|
|
)
|
|
if frame_summary.locals:
|
|
for name, value in sorted(frame_summary.locals.items()):
|
|
row.append(' {name} = {value}\n'.format(name=name, value=value))
|
|
|
|
return ''.join(row)
|
|
|
|
def should_show_carets(self, start_offset, end_offset, all_lines, anchors):
|
|
with suppress(SyntaxError, ImportError):
|
|
import ast
|
|
tree = ast.parse('\n'.join(all_lines))
|
|
statement = tree.body[0]
|
|
value = None
|
|
def _spawns_full_line(value):
|
|
return (
|
|
value.lineno == 1
|
|
and value.end_lineno == len(all_lines)
|
|
and value.col_offset == start_offset
|
|
and value.end_col_offset == end_offset
|
|
)
|
|
match statement:
|
|
case ast.Return(value=ast.Call()):
|
|
if isinstance(statement.value.func, ast.Name):
|
|
value = statement.value
|
|
case ast.Assign(value=ast.Call()):
|
|
if (
|
|
len(statement.targets) == 1 and
|
|
isinstance(statement.targets[0], ast.Name)
|
|
):
|
|
value = statement.value
|
|
if value is not None and _spawns_full_line(value):
|
|
return False
|
|
if anchors:
|
|
return True
|
|
if all_lines[0][:start_offset].lstrip() or all_lines[-1][end_offset:].rstrip():
|
|
return True
|
|
return False
|
|
|
|
def format(self, **kwargs):
|
|
"""Format the stack ready for printing.
|
|
|
|
Returns a list of strings ready for printing. Each string in the
|
|
resulting list corresponds to a single frame from the stack.
|
|
Each string ends in a newline; the strings may contain internal
|
|
newlines as well, for those items with source text lines.
|
|
|
|
For long sequences of the same frame and line, the first few
|
|
repetitions are shown, followed by a summary line stating the exact
|
|
number of further repetitions.
|
|
"""
|
|
colorize = kwargs.get("colorize", False)
|
|
result = []
|
|
last_file = None
|
|
last_line = None
|
|
last_name = None
|
|
count = 0
|
|
for frame_summary in self:
|
|
formatted_frame = self.format_frame_summary(frame_summary, colorize=colorize)
|
|
if formatted_frame is None:
|
|
continue
|
|
if (last_file is None or last_file != frame_summary.filename or
|
|
last_line is None or last_line != frame_summary.lineno or
|
|
last_name is None or last_name != frame_summary.name):
|
|
if count > _RECURSIVE_CUTOFF:
|
|
count -= _RECURSIVE_CUTOFF
|
|
result.append(
|
|
f' [Previous line repeated {count} more '
|
|
f'time{"s" if count > 1 else ""}]\n'
|
|
)
|
|
last_file = frame_summary.filename
|
|
last_line = frame_summary.lineno
|
|
last_name = frame_summary.name
|
|
count = 0
|
|
count += 1
|
|
if count > _RECURSIVE_CUTOFF:
|
|
continue
|
|
result.append(formatted_frame)
|
|
|
|
if count > _RECURSIVE_CUTOFF:
|
|
count -= _RECURSIVE_CUTOFF
|
|
result.append(
|
|
f' [Previous line repeated {count} more '
|
|
f'time{"s" if count > 1 else ""}]\n'
|
|
)
|
|
return result
|
|
|
|
|
|
def _byte_offset_to_character_offset(str, offset):
|
|
as_utf8 = str.encode('utf-8')
|
|
return len(as_utf8[:offset].decode("utf-8", errors="replace"))
|
|
|
|
|
|
_Anchors = collections.namedtuple(
|
|
"_Anchors",
|
|
[
|
|
"left_end_lineno",
|
|
"left_end_offset",
|
|
"right_start_lineno",
|
|
"right_start_offset",
|
|
"primary_char",
|
|
"secondary_char",
|
|
],
|
|
defaults=["~", "^"]
|
|
)
|
|
|
|
def _extract_caret_anchors_from_line_segment(segment):
|
|
"""
|
|
Given source code `segment` corresponding to a FrameSummary, determine:
|
|
- for binary ops, the location of the binary op
|
|
- for indexing and function calls, the location of the brackets.
|
|
`segment` is expected to be a valid Python expression.
|
|
"""
|
|
import ast
|
|
|
|
try:
|
|
# Without parentheses, `segment` is parsed as a statement.
|
|
# Binary ops, subscripts, and calls are expressions, so
|
|
# we can wrap them with parentheses to parse them as
|
|
# (possibly multi-line) expressions.
|
|
# e.g. if we try to highlight the addition in
|
|
# x = (
|
|
# a +
|
|
# b
|
|
# )
|
|
# then we would ast.parse
|
|
# a +
|
|
# b
|
|
# which is not a valid statement because of the newline.
|
|
# Adding brackets makes it a valid expression.
|
|
# (
|
|
# a +
|
|
# b
|
|
# )
|
|
# Line locations will be different than the original,
|
|
# which is taken into account later on.
|
|
tree = ast.parse(f"(\n{segment}\n)")
|
|
except SyntaxError:
|
|
return None
|
|
|
|
if len(tree.body) != 1:
|
|
return None
|
|
|
|
lines = segment.splitlines()
|
|
|
|
def normalize(lineno, offset):
|
|
"""Get character index given byte offset"""
|
|
return _byte_offset_to_character_offset(lines[lineno], offset)
|
|
|
|
def next_valid_char(lineno, col):
|
|
"""Gets the next valid character index in `lines`, if
|
|
the current location is not valid. Handles empty lines.
|
|
"""
|
|
while lineno < len(lines) and col >= len(lines[lineno]):
|
|
col = 0
|
|
lineno += 1
|
|
assert lineno < len(lines) and col < len(lines[lineno])
|
|
return lineno, col
|
|
|
|
def increment(lineno, col):
|
|
"""Get the next valid character index in `lines`."""
|
|
col += 1
|
|
lineno, col = next_valid_char(lineno, col)
|
|
return lineno, col
|
|
|
|
def nextline(lineno, col):
|
|
"""Get the next valid character at least on the next line"""
|
|
col = 0
|
|
lineno += 1
|
|
lineno, col = next_valid_char(lineno, col)
|
|
return lineno, col
|
|
|
|
def increment_until(lineno, col, stop):
|
|
"""Get the next valid non-"\\#" character that satisfies the `stop` predicate"""
|
|
while True:
|
|
ch = lines[lineno][col]
|
|
if ch in "\\#":
|
|
lineno, col = nextline(lineno, col)
|
|
elif not stop(ch):
|
|
lineno, col = increment(lineno, col)
|
|
else:
|
|
break
|
|
return lineno, col
|
|
|
|
def setup_positions(expr, force_valid=True):
|
|
"""Get the lineno/col position of the end of `expr`. If `force_valid` is True,
|
|
forces the position to be a valid character (e.g. if the position is beyond the
|
|
end of the line, move to the next line)
|
|
"""
|
|
# -2 since end_lineno is 1-indexed and because we added an extra
|
|
# bracket + newline to `segment` when calling ast.parse
|
|
lineno = expr.end_lineno - 2
|
|
col = normalize(lineno, expr.end_col_offset)
|
|
return next_valid_char(lineno, col) if force_valid else (lineno, col)
|
|
|
|
statement = tree.body[0]
|
|
match statement:
|
|
case ast.Expr(expr):
|
|
match expr:
|
|
case ast.BinOp():
|
|
# ast gives these locations for BinOp subexpressions
|
|
# ( left_expr ) + ( right_expr )
|
|
# left^^^^^ right^^^^^
|
|
lineno, col = setup_positions(expr.left)
|
|
|
|
# First operator character is the first non-space/')' character
|
|
lineno, col = increment_until(lineno, col, lambda x: not x.isspace() and x != ')')
|
|
|
|
# binary op is 1 or 2 characters long, on the same line,
|
|
# before the right subexpression
|
|
right_col = col + 1
|
|
if (
|
|
right_col < len(lines[lineno])
|
|
and (
|
|
# operator char should not be in the right subexpression
|
|
expr.right.lineno - 2 > lineno or
|
|
right_col < normalize(expr.right.lineno - 2, expr.right.col_offset)
|
|
)
|
|
and not (ch := lines[lineno][right_col]).isspace()
|
|
and ch not in "\\#"
|
|
):
|
|
right_col += 1
|
|
|
|
# right_col can be invalid since it is exclusive
|
|
return _Anchors(lineno, col, lineno, right_col)
|
|
case ast.Subscript():
|
|
# ast gives these locations for value and slice subexpressions
|
|
# ( value_expr ) [ slice_expr ]
|
|
# value^^^^^ slice^^^^^
|
|
# subscript^^^^^^^^^^^^^^^^^^^^
|
|
|
|
# find left bracket
|
|
left_lineno, left_col = setup_positions(expr.value)
|
|
left_lineno, left_col = increment_until(left_lineno, left_col, lambda x: x == '[')
|
|
# find right bracket (final character of expression)
|
|
right_lineno, right_col = setup_positions(expr, force_valid=False)
|
|
return _Anchors(left_lineno, left_col, right_lineno, right_col)
|
|
case ast.Call():
|
|
# ast gives these locations for function call expressions
|
|
# ( func_expr ) (args, kwargs)
|
|
# func^^^^^
|
|
# call^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
# find left bracket
|
|
left_lineno, left_col = setup_positions(expr.func)
|
|
left_lineno, left_col = increment_until(left_lineno, left_col, lambda x: x == '(')
|
|
# find right bracket (final character of expression)
|
|
right_lineno, right_col = setup_positions(expr, force_valid=False)
|
|
return _Anchors(left_lineno, left_col, right_lineno, right_col)
|
|
|
|
return None
|
|
|
|
_WIDE_CHAR_SPECIFIERS = "WF"
|
|
|
|
def _display_width(line, offset=None):
|
|
"""Calculate the extra amount of width space the given source
|
|
code segment might take if it were to be displayed on a fixed
|
|
width output device. Supports wide unicode characters and emojis."""
|
|
|
|
if offset is None:
|
|
offset = len(line)
|
|
|
|
# Fast track for ASCII-only strings
|
|
if line.isascii():
|
|
return offset
|
|
|
|
import unicodedata
|
|
|
|
return sum(
|
|
2 if unicodedata.east_asian_width(char) in _WIDE_CHAR_SPECIFIERS else 1
|
|
for char in line[:offset]
|
|
)
|
|
|
|
|
|
|
|
class _ExceptionPrintContext:
|
|
def __init__(self):
|
|
self.seen = set()
|
|
self.exception_group_depth = 0
|
|
self.need_close = False
|
|
|
|
def indent(self):
|
|
return ' ' * (2 * self.exception_group_depth)
|
|
|
|
def emit(self, text_gen, margin_char=None):
|
|
if margin_char is None:
|
|
margin_char = '|'
|
|
indent_str = self.indent()
|
|
if self.exception_group_depth:
|
|
indent_str += margin_char + ' '
|
|
|
|
if isinstance(text_gen, str):
|
|
yield textwrap.indent(text_gen, indent_str, lambda line: True)
|
|
else:
|
|
for text in text_gen:
|
|
yield textwrap.indent(text, indent_str, lambda line: True)
|
|
|
|
|
|
class TracebackException:
|
|
"""An exception ready for rendering.
|
|
|
|
The traceback module captures enough attributes from the original exception
|
|
to this intermediary form to ensure that no references are held, while
|
|
still being able to fully print or format it.
|
|
|
|
max_group_width and max_group_depth control the formatting of exception
|
|
groups. The depth refers to the nesting level of the group, and the width
|
|
refers to the size of a single exception group's exceptions array. The
|
|
formatted output is truncated when either limit is exceeded.
|
|
|
|
Use `from_exception` to create TracebackException instances from exception
|
|
objects, or the constructor to create TracebackException instances from
|
|
individual components.
|
|
|
|
- :attr:`__cause__` A TracebackException of the original *__cause__*.
|
|
- :attr:`__context__` A TracebackException of the original *__context__*.
|
|
- :attr:`exceptions` For exception groups - a list of TracebackException
|
|
instances for the nested *exceptions*. ``None`` for other exceptions.
|
|
- :attr:`__suppress_context__` The *__suppress_context__* value from the
|
|
original exception.
|
|
- :attr:`stack` A `StackSummary` representing the traceback.
|
|
- :attr:`exc_type` (deprecated) The class of the original traceback.
|
|
- :attr:`exc_type_str` String display of exc_type
|
|
- :attr:`filename` For syntax errors - the filename where the error
|
|
occurred.
|
|
- :attr:`lineno` For syntax errors - the linenumber where the error
|
|
occurred.
|
|
- :attr:`end_lineno` For syntax errors - the end linenumber where the error
|
|
occurred. Can be `None` if not present.
|
|
- :attr:`text` For syntax errors - the text where the error
|
|
occurred.
|
|
- :attr:`offset` For syntax errors - the offset into the text where the
|
|
error occurred.
|
|
- :attr:`end_offset` For syntax errors - the end offset into the text where
|
|
the error occurred. Can be `None` if not present.
|
|
- :attr:`msg` For syntax errors - the compiler error message.
|
|
"""
|
|
|
|
def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
|
|
lookup_lines=True, capture_locals=False, compact=False,
|
|
max_group_width=15, max_group_depth=10, save_exc_type=True, _seen=None):
|
|
# NB: we need to accept exc_traceback, exc_value, exc_traceback to
|
|
# permit backwards compat with the existing API, otherwise we
|
|
# need stub thunk objects just to glue it together.
|
|
# Handle loops in __cause__ or __context__.
|
|
is_recursive_call = _seen is not None
|
|
if _seen is None:
|
|
_seen = set()
|
|
_seen.add(id(exc_value))
|
|
|
|
self.max_group_width = max_group_width
|
|
self.max_group_depth = max_group_depth
|
|
|
|
self.stack = StackSummary._extract_from_extended_frame_gen(
|
|
_walk_tb_with_full_positions(exc_traceback),
|
|
limit=limit, lookup_lines=lookup_lines,
|
|
capture_locals=capture_locals)
|
|
|
|
self._exc_type = exc_type if save_exc_type else None
|
|
|
|
# Capture now to permit freeing resources: only complication is in the
|
|
# unofficial API _format_final_exc_line
|
|
self._str = _safe_string(exc_value, 'exception')
|
|
try:
|
|
self.__notes__ = getattr(exc_value, '__notes__', None)
|
|
except Exception as e:
|
|
self.__notes__ = [
|
|
f'Ignored error getting __notes__: {_safe_string(e, '__notes__', repr)}']
|
|
|
|
self._is_syntax_error = False
|
|
self._have_exc_type = exc_type is not None
|
|
if exc_type is not None:
|
|
self.exc_type_qualname = exc_type.__qualname__
|
|
self.exc_type_module = exc_type.__module__
|
|
else:
|
|
self.exc_type_qualname = None
|
|
self.exc_type_module = None
|
|
|
|
if exc_type and issubclass(exc_type, SyntaxError):
|
|
# Handle SyntaxError's specially
|
|
self.filename = exc_value.filename
|
|
lno = exc_value.lineno
|
|
self.lineno = str(lno) if lno is not None else None
|
|
end_lno = exc_value.end_lineno
|
|
self.end_lineno = str(end_lno) if end_lno is not None else None
|
|
self.text = exc_value.text
|
|
self.offset = exc_value.offset
|
|
self.end_offset = exc_value.end_offset
|
|
self.msg = exc_value.msg
|
|
self._is_syntax_error = True
|
|
elif exc_type and issubclass(exc_type, ImportError) and \
|
|
getattr(exc_value, "name_from", None) is not None:
|
|
wrong_name = getattr(exc_value, "name_from", None)
|
|
suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
|
|
if suggestion:
|
|
self._str += f". Did you mean: '{suggestion}'?"
|
|
elif exc_type and issubclass(exc_type, (NameError, AttributeError)) and \
|
|
getattr(exc_value, "name", None) is not None:
|
|
wrong_name = getattr(exc_value, "name", None)
|
|
suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
|
|
if suggestion:
|
|
self._str += f". Did you mean: '{suggestion}'?"
|
|
if issubclass(exc_type, NameError):
|
|
wrong_name = getattr(exc_value, "name", None)
|
|
if wrong_name is not None and wrong_name in sys.stdlib_module_names:
|
|
if suggestion:
|
|
self._str += f" Or did you forget to import '{wrong_name}'?"
|
|
else:
|
|
self._str += f". Did you forget to import '{wrong_name}'?"
|
|
if lookup_lines:
|
|
self._load_lines()
|
|
self.__suppress_context__ = \
|
|
exc_value.__suppress_context__ if exc_value is not None else False
|
|
|
|
# Convert __cause__ and __context__ to `TracebackExceptions`s, use a
|
|
# queue to avoid recursion (only the top-level call gets _seen == None)
|
|
if not is_recursive_call:
|
|
queue = [(self, exc_value)]
|
|
while queue:
|
|
te, e = queue.pop()
|
|
if (e and e.__cause__ is not None
|
|
and id(e.__cause__) not in _seen):
|
|
cause = TracebackException(
|
|
type(e.__cause__),
|
|
e.__cause__,
|
|
e.__cause__.__traceback__,
|
|
limit=limit,
|
|
lookup_lines=lookup_lines,
|
|
capture_locals=capture_locals,
|
|
max_group_width=max_group_width,
|
|
max_group_depth=max_group_depth,
|
|
_seen=_seen)
|
|
else:
|
|
cause = None
|
|
|
|
if compact:
|
|
need_context = (cause is None and
|
|
e is not None and
|
|
not e.__suppress_context__)
|
|
else:
|
|
need_context = True
|
|
if (e and e.__context__ is not None
|
|
and need_context and id(e.__context__) not in _seen):
|
|
context = TracebackException(
|
|
type(e.__context__),
|
|
e.__context__,
|
|
e.__context__.__traceback__,
|
|
limit=limit,
|
|
lookup_lines=lookup_lines,
|
|
capture_locals=capture_locals,
|
|
max_group_width=max_group_width,
|
|
max_group_depth=max_group_depth,
|
|
_seen=_seen)
|
|
else:
|
|
context = None
|
|
|
|
if e and isinstance(e, BaseExceptionGroup):
|
|
exceptions = []
|
|
for exc in e.exceptions:
|
|
texc = TracebackException(
|
|
type(exc),
|
|
exc,
|
|
exc.__traceback__,
|
|
limit=limit,
|
|
lookup_lines=lookup_lines,
|
|
capture_locals=capture_locals,
|
|
max_group_width=max_group_width,
|
|
max_group_depth=max_group_depth,
|
|
_seen=_seen)
|
|
exceptions.append(texc)
|
|
else:
|
|
exceptions = None
|
|
|
|
te.__cause__ = cause
|
|
te.__context__ = context
|
|
te.exceptions = exceptions
|
|
if cause:
|
|
queue.append((te.__cause__, e.__cause__))
|
|
if context:
|
|
queue.append((te.__context__, e.__context__))
|
|
if exceptions:
|
|
queue.extend(zip(te.exceptions, e.exceptions))
|
|
|
|
@classmethod
|
|
def from_exception(cls, exc, *args, **kwargs):
|
|
"""Create a TracebackException from an exception."""
|
|
return cls(type(exc), exc, exc.__traceback__, *args, **kwargs)
|
|
|
|
@property
|
|
def exc_type(self):
|
|
warnings.warn('Deprecated in 3.13. Use exc_type_str instead.',
|
|
DeprecationWarning, stacklevel=2)
|
|
return self._exc_type
|
|
|
|
@property
|
|
def exc_type_str(self):
|
|
if not self._have_exc_type:
|
|
return None
|
|
stype = self.exc_type_qualname
|
|
smod = self.exc_type_module
|
|
if smod not in ("__main__", "builtins"):
|
|
if not isinstance(smod, str):
|
|
smod = "<unknown>"
|
|
stype = smod + '.' + stype
|
|
return stype
|
|
|
|
def _load_lines(self):
|
|
"""Private API. force all lines in the stack to be loaded."""
|
|
for frame in self.stack:
|
|
frame.line
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, TracebackException):
|
|
return self.__dict__ == other.__dict__
|
|
return NotImplemented
|
|
|
|
def __str__(self):
|
|
return self._str
|
|
|
|
def format_exception_only(self, *, show_group=False, _depth=0, **kwargs):
|
|
"""Format the exception part of the traceback.
|
|
|
|
The return value is a generator of strings, each ending in a newline.
|
|
|
|
Generator yields the exception message.
|
|
For :exc:`SyntaxError` exceptions, it
|
|
also yields (before the exception message)
|
|
several lines that (when printed)
|
|
display detailed information about where the syntax error occurred.
|
|
Following the message, generator also yields
|
|
all the exception's ``__notes__``.
|
|
|
|
When *show_group* is ``True``, and the exception is an instance of
|
|
:exc:`BaseExceptionGroup`, the nested exceptions are included as
|
|
well, recursively, with indentation relative to their nesting depth.
|
|
"""
|
|
colorize = kwargs.get("colorize", False)
|
|
|
|
indent = 3 * _depth * ' '
|
|
if not self._have_exc_type:
|
|
yield indent + _format_final_exc_line(None, self._str, colorize=colorize)
|
|
return
|
|
|
|
stype = self.exc_type_str
|
|
if not self._is_syntax_error:
|
|
if _depth > 0:
|
|
# Nested exceptions needs correct handling of multiline messages.
|
|
formatted = _format_final_exc_line(
|
|
stype, self._str, insert_final_newline=False, colorize=colorize
|
|
).split('\n')
|
|
yield from [
|
|
indent + l + '\n'
|
|
for l in formatted
|
|
]
|
|
else:
|
|
yield _format_final_exc_line(stype, self._str, colorize=colorize)
|
|
else:
|
|
yield from [indent + l for l in self._format_syntax_error(stype, colorize=colorize)]
|
|
|
|
if (
|
|
isinstance(self.__notes__, collections.abc.Sequence)
|
|
and not isinstance(self.__notes__, (str, bytes))
|
|
):
|
|
for note in self.__notes__:
|
|
note = _safe_string(note, 'note')
|
|
yield from [indent + l + '\n' for l in note.split('\n')]
|
|
elif self.__notes__ is not None:
|
|
yield indent + "{}\n".format(_safe_string(self.__notes__, '__notes__', func=repr))
|
|
|
|
if self.exceptions and show_group:
|
|
for ex in self.exceptions:
|
|
yield from ex.format_exception_only(show_group=show_group, _depth=_depth+1, colorize=colorize)
|
|
|
|
def _format_syntax_error(self, stype, **kwargs):
|
|
"""Format SyntaxError exceptions (internal helper)."""
|
|
# Show exactly where the problem was found.
|
|
colorize = kwargs.get("colorize", False)
|
|
filename_suffix = ''
|
|
if self.lineno is not None:
|
|
if colorize:
|
|
yield ' File {}"{}"{}, line {}{}{}\n'.format(
|
|
ANSIColors.MAGENTA,
|
|
self.filename or "<string>",
|
|
ANSIColors.RESET,
|
|
ANSIColors.MAGENTA,
|
|
self.lineno,
|
|
ANSIColors.RESET,
|
|
)
|
|
else:
|
|
yield ' File "{}", line {}\n'.format(
|
|
self.filename or "<string>", self.lineno)
|
|
elif self.filename is not None:
|
|
filename_suffix = ' ({})'.format(self.filename)
|
|
|
|
text = self.text
|
|
if text is not None:
|
|
# text = " foo\n"
|
|
# rtext = " foo"
|
|
# ltext = "foo"
|
|
rtext = text.rstrip('\n')
|
|
ltext = rtext.lstrip(' \n\f')
|
|
spaces = len(rtext) - len(ltext)
|
|
if self.offset is None:
|
|
yield ' {}\n'.format(ltext)
|
|
else:
|
|
offset = self.offset
|
|
end_offset = self.end_offset if self.end_offset not in {None, 0} else offset
|
|
if self.text and offset > len(self.text):
|
|
offset = len(self.text) + 1
|
|
if self.text and end_offset > len(self.text):
|
|
end_offset = len(self.text) + 1
|
|
if offset >= end_offset or end_offset < 0:
|
|
end_offset = offset + 1
|
|
|
|
# Convert 1-based column offset to 0-based index into stripped text
|
|
colno = offset - 1 - spaces
|
|
end_colno = end_offset - 1 - spaces
|
|
caretspace = ' '
|
|
if colno >= 0:
|
|
# non-space whitespace (likes tabs) must be kept for alignment
|
|
caretspace = ((c if c.isspace() else ' ') for c in ltext[:colno])
|
|
start_color = end_color = ""
|
|
if colorize:
|
|
# colorize from colno to end_colno
|
|
ltext = (
|
|
ltext[:colno] +
|
|
ANSIColors.BOLD_RED + ltext[colno:end_colno] + ANSIColors.RESET +
|
|
ltext[end_colno:]
|
|
)
|
|
start_color = ANSIColors.BOLD_RED
|
|
end_color = ANSIColors.RESET
|
|
yield ' {}\n'.format(ltext)
|
|
yield ' {}{}{}{}\n'.format(
|
|
"".join(caretspace),
|
|
start_color,
|
|
('^' * (end_colno - colno)),
|
|
end_color,
|
|
)
|
|
else:
|
|
yield ' {}\n'.format(ltext)
|
|
msg = self.msg or "<no detail available>"
|
|
if colorize:
|
|
yield "{}{}{}: {}{}{}{}\n".format(
|
|
ANSIColors.BOLD_MAGENTA,
|
|
stype,
|
|
ANSIColors.RESET,
|
|
ANSIColors.MAGENTA,
|
|
msg,
|
|
ANSIColors.RESET,
|
|
filename_suffix)
|
|
else:
|
|
yield "{}: {}{}\n".format(stype, msg, filename_suffix)
|
|
|
|
def format(self, *, chain=True, _ctx=None, **kwargs):
|
|
"""Format the exception.
|
|
|
|
If chain is not *True*, *__cause__* and *__context__* will not be formatted.
|
|
|
|
The return value is a generator of strings, each ending in a newline and
|
|
some containing internal newlines. `print_exception` is a wrapper around
|
|
this method which just prints the lines to a file.
|
|
|
|
The message indicating which exception occurred is always the last
|
|
string in the output.
|
|
"""
|
|
colorize = kwargs.get("colorize", False)
|
|
if _ctx is None:
|
|
_ctx = _ExceptionPrintContext()
|
|
|
|
output = []
|
|
exc = self
|
|
if chain:
|
|
while exc:
|
|
if exc.__cause__ is not None:
|
|
chained_msg = _cause_message
|
|
chained_exc = exc.__cause__
|
|
elif (exc.__context__ is not None and
|
|
not exc.__suppress_context__):
|
|
chained_msg = _context_message
|
|
chained_exc = exc.__context__
|
|
else:
|
|
chained_msg = None
|
|
chained_exc = None
|
|
|
|
output.append((chained_msg, exc))
|
|
exc = chained_exc
|
|
else:
|
|
output.append((None, exc))
|
|
|
|
for msg, exc in reversed(output):
|
|
if msg is not None:
|
|
yield from _ctx.emit(msg)
|
|
if exc.exceptions is None:
|
|
if exc.stack:
|
|
yield from _ctx.emit('Traceback (most recent call last):\n')
|
|
yield from _ctx.emit(exc.stack.format(colorize=colorize))
|
|
yield from _ctx.emit(exc.format_exception_only(colorize=colorize))
|
|
elif _ctx.exception_group_depth > self.max_group_depth:
|
|
# exception group, but depth exceeds limit
|
|
yield from _ctx.emit(
|
|
f"... (max_group_depth is {self.max_group_depth})\n")
|
|
else:
|
|
# format exception group
|
|
is_toplevel = (_ctx.exception_group_depth == 0)
|
|
if is_toplevel:
|
|
_ctx.exception_group_depth += 1
|
|
|
|
if exc.stack:
|
|
yield from _ctx.emit(
|
|
'Exception Group Traceback (most recent call last):\n',
|
|
margin_char = '+' if is_toplevel else None)
|
|
yield from _ctx.emit(exc.stack.format(colorize=colorize))
|
|
|
|
yield from _ctx.emit(exc.format_exception_only(colorize=colorize))
|
|
num_excs = len(exc.exceptions)
|
|
if num_excs <= self.max_group_width:
|
|
n = num_excs
|
|
else:
|
|
n = self.max_group_width + 1
|
|
_ctx.need_close = False
|
|
for i in range(n):
|
|
last_exc = (i == n-1)
|
|
if last_exc:
|
|
# The closing frame may be added by a recursive call
|
|
_ctx.need_close = True
|
|
|
|
if self.max_group_width is not None:
|
|
truncated = (i >= self.max_group_width)
|
|
else:
|
|
truncated = False
|
|
title = f'{i+1}' if not truncated else '...'
|
|
yield (_ctx.indent() +
|
|
('+-' if i==0 else ' ') +
|
|
f'+---------------- {title} ----------------\n')
|
|
_ctx.exception_group_depth += 1
|
|
if not truncated:
|
|
yield from exc.exceptions[i].format(chain=chain, _ctx=_ctx)
|
|
else:
|
|
remaining = num_excs - self.max_group_width
|
|
plural = 's' if remaining > 1 else ''
|
|
yield from _ctx.emit(
|
|
f"and {remaining} more exception{plural}\n")
|
|
|
|
if last_exc and _ctx.need_close:
|
|
yield (_ctx.indent() +
|
|
"+------------------------------------\n")
|
|
_ctx.need_close = False
|
|
_ctx.exception_group_depth -= 1
|
|
|
|
if is_toplevel:
|
|
assert _ctx.exception_group_depth == 1
|
|
_ctx.exception_group_depth = 0
|
|
|
|
|
|
def print(self, *, file=None, chain=True, **kwargs):
|
|
"""Print the result of self.format(chain=chain) to 'file'."""
|
|
colorize = kwargs.get("colorize", False)
|
|
if file is None:
|
|
file = sys.stderr
|
|
for line in self.format(chain=chain, colorize=colorize):
|
|
print(line, file=file, end="")
|
|
|
|
|
|
_MAX_CANDIDATE_ITEMS = 750
|
|
_MAX_STRING_SIZE = 40
|
|
_MOVE_COST = 2
|
|
_CASE_COST = 1
|
|
|
|
|
|
def _substitution_cost(ch_a, ch_b):
|
|
if ch_a == ch_b:
|
|
return 0
|
|
if ch_a.lower() == ch_b.lower():
|
|
return _CASE_COST
|
|
return _MOVE_COST
|
|
|
|
|
|
def _compute_suggestion_error(exc_value, tb, wrong_name):
|
|
if wrong_name is None or not isinstance(wrong_name, str):
|
|
return None
|
|
if isinstance(exc_value, AttributeError):
|
|
obj = exc_value.obj
|
|
try:
|
|
d = dir(obj)
|
|
hide_underscored = (wrong_name[:1] != '_')
|
|
if hide_underscored and tb is not None:
|
|
while tb.tb_next is not None:
|
|
tb = tb.tb_next
|
|
frame = tb.tb_frame
|
|
if 'self' in frame.f_locals and frame.f_locals['self'] is obj:
|
|
hide_underscored = False
|
|
if hide_underscored:
|
|
d = [x for x in d if x[:1] != '_']
|
|
except Exception:
|
|
return None
|
|
elif isinstance(exc_value, ImportError):
|
|
try:
|
|
mod = __import__(exc_value.name)
|
|
d = dir(mod)
|
|
if wrong_name[:1] != '_':
|
|
d = [x for x in d if x[:1] != '_']
|
|
except Exception:
|
|
return None
|
|
else:
|
|
assert isinstance(exc_value, NameError)
|
|
# find most recent frame
|
|
if tb is None:
|
|
return None
|
|
while tb.tb_next is not None:
|
|
tb = tb.tb_next
|
|
frame = tb.tb_frame
|
|
d = (
|
|
list(frame.f_locals)
|
|
+ list(frame.f_globals)
|
|
+ list(frame.f_builtins)
|
|
)
|
|
|
|
# Check first if we are in a method and the instance
|
|
# has the wrong name as attribute
|
|
if 'self' in frame.f_locals:
|
|
self = frame.f_locals['self']
|
|
if hasattr(self, wrong_name):
|
|
return f"self.{wrong_name}"
|
|
|
|
try:
|
|
import _suggestions
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
return _suggestions._generate_suggestions(d, wrong_name)
|
|
|
|
# Compute closest match
|
|
|
|
if len(d) > _MAX_CANDIDATE_ITEMS:
|
|
return None
|
|
wrong_name_len = len(wrong_name)
|
|
if wrong_name_len > _MAX_STRING_SIZE:
|
|
return None
|
|
best_distance = wrong_name_len
|
|
suggestion = None
|
|
for possible_name in d:
|
|
if possible_name == wrong_name:
|
|
# A missing attribute is "found". Don't suggest it (see GH-88821).
|
|
continue
|
|
# No more than 1/3 of the involved characters should need changed.
|
|
max_distance = (len(possible_name) + wrong_name_len + 3) * _MOVE_COST // 6
|
|
# Don't take matches we've already beaten.
|
|
max_distance = min(max_distance, best_distance - 1)
|
|
current_distance = _levenshtein_distance(wrong_name, possible_name, max_distance)
|
|
if current_distance > max_distance:
|
|
continue
|
|
if not suggestion or current_distance < best_distance:
|
|
suggestion = possible_name
|
|
best_distance = current_distance
|
|
return suggestion
|
|
|
|
|
|
def _levenshtein_distance(a, b, max_cost):
|
|
# A Python implementation of Python/suggestions.c:levenshtein_distance.
|
|
|
|
# Both strings are the same
|
|
if a == b:
|
|
return 0
|
|
|
|
# Trim away common affixes
|
|
pre = 0
|
|
while a[pre:] and b[pre:] and a[pre] == b[pre]:
|
|
pre += 1
|
|
a = a[pre:]
|
|
b = b[pre:]
|
|
post = 0
|
|
while a[:post or None] and b[:post or None] and a[post-1] == b[post-1]:
|
|
post -= 1
|
|
a = a[:post or None]
|
|
b = b[:post or None]
|
|
if not a or not b:
|
|
return _MOVE_COST * (len(a) + len(b))
|
|
if len(a) > _MAX_STRING_SIZE or len(b) > _MAX_STRING_SIZE:
|
|
return max_cost + 1
|
|
|
|
# Prefer shorter buffer
|
|
if len(b) < len(a):
|
|
a, b = b, a
|
|
|
|
# Quick fail when a match is impossible
|
|
if (len(b) - len(a)) * _MOVE_COST > max_cost:
|
|
return max_cost + 1
|
|
|
|
# Instead of producing the whole traditional len(a)-by-len(b)
|
|
# matrix, we can update just one row in place.
|
|
# Initialize the buffer row
|
|
row = list(range(_MOVE_COST, _MOVE_COST * (len(a) + 1), _MOVE_COST))
|
|
|
|
result = 0
|
|
for bindex in range(len(b)):
|
|
bchar = b[bindex]
|
|
distance = result = bindex * _MOVE_COST
|
|
minimum = sys.maxsize
|
|
for index in range(len(a)):
|
|
# 1) Previous distance in this row is cost(b[:b_index], a[:index])
|
|
substitute = distance + _substitution_cost(bchar, a[index])
|
|
# 2) cost(b[:b_index], a[:index+1]) from previous row
|
|
distance = row[index]
|
|
# 3) existing result is cost(b[:b_index+1], a[index])
|
|
|
|
insert_delete = min(result, distance) + _MOVE_COST
|
|
result = min(insert_delete, substitute)
|
|
|
|
# cost(b[:b_index+1], a[:index+1])
|
|
row[index] = result
|
|
if result < minimum:
|
|
minimum = result
|
|
if minimum > max_cost:
|
|
# Everything in this row is too big, so bail early.
|
|
return max_cost + 1
|
|
return result
|