diff options
Diffstat (limited to 'Lib/traceback.py')
| -rw-r--r-- | Lib/traceback.py | 197 |
1 files changed, 162 insertions, 35 deletions
diff --git a/Lib/traceback.py b/Lib/traceback.py index a0485a7..1cf008c 100644 --- a/Lib/traceback.py +++ b/Lib/traceback.py @@ -1,5 +1,7 @@ """Extract, format and print information about Python stack traces.""" +import os +import io import collections.abc import itertools import linecache @@ -19,6 +21,8 @@ __all__ = ['extract_stack', 'extract_tb', 'format_exception', # Formatting and printing lists of traceback lines. # +_COLORIZE = True + def print_list(extracted_list, file=None): """Print the list of tuples as returned by extract_tb() or extract_stack() as a formatted stack trace to the given file.""" @@ -110,7 +114,7 @@ def _parse_value_tb(exc, value, tb): def print_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \ - file=None, chain=True): + file=None, chain=True, **kwargs): """Print exception up to 'limit' stack trace entries from 'tb' to 'file'. This differs from print_tb() in the following ways: (1) if @@ -121,17 +125,44 @@ def print_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \ occurred with a caret on the next line indicating the approximate position of the error. """ + colorize = kwargs.get("colorize", False) value, tb = _parse_value_tb(exc, value, tb) te = TracebackException(type(value), value, tb, limit=limit, compact=True) - te.print(file=file, chain=chain) + te.print(file=file, chain=chain, colorize=colorize) BUILTIN_EXCEPTION_LIMIT = object() +def _can_colorize(): + if sys.platform == "win32": + try: + import nt + if not nt._supports_virtual_terminal(): + return False + except (ImportError, AttributeError): + return False + + if os.environ.get("PYTHON_COLORS") == "0": + return False + if os.environ.get("PYTHON_COLORS") == "1": + return True + if "NO_COLOR" in os.environ: + return False + if not _COLORIZE: + return False + if "FORCE_COLOR" in os.environ: + return True + if os.environ.get("TERM") == "dumb": + return False + try: + return os.isatty(sys.stderr.fileno()) + except io.UnsupportedOperation: + return sys.stderr.isatty() def _print_exception_bltin(exc, /): file = sys.stderr if sys.stderr is not None else sys.__stderr__ - return print_exception(exc, limit=BUILTIN_EXCEPTION_LIMIT, file=file) + colorize = _can_colorize() + return print_exception(exc, limit=BUILTIN_EXCEPTION_LIMIT, file=file, colorize=colorize) def format_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \ @@ -172,13 +203,19 @@ def format_exception_only(exc, /, value=_sentinel, *, show_group=False): # -- not official API but folk probably use these two functions. -def _format_final_exc_line(etype, value, *, insert_final_newline=True): +def _format_final_exc_line(etype, value, *, insert_final_newline=True, colorize=False): valuestr = _safe_string(value, 'exception') end_char = "\n" if insert_final_newline else "" - if value is None or not valuestr: - line = f"{etype}{end_char}" + if colorize: + if value is None or not valuestr: + line = f"{_ANSIColors.BOLD_MAGENTA}{etype}{_ANSIColors.RESET}{end_char}" + else: + line = f"{_ANSIColors.BOLD_MAGENTA}{etype}{_ANSIColors.RESET}: {_ANSIColors.MAGENTA}{valuestr}{_ANSIColors.RESET}{end_char}" else: - line = f"{etype}: {valuestr}{end_char}" + if value is None or not valuestr: + line = f"{etype}{end_char}" + else: + line = f"{etype}: {valuestr}{end_char}" return line def _safe_string(value, what, func=str): @@ -406,6 +443,14 @@ def _get_code_position(code, instruction_index): _RECURSIVE_CUTOFF = 3 # Also hardcoded in traceback.c. +class _ANSIColors: + RED = '\x1b[31m' + BOLD_RED = '\x1b[1;31m' + MAGENTA = '\x1b[35m' + BOLD_MAGENTA = '\x1b[1;35m' + GREY = '\x1b[90m' + RESET = '\x1b[0m' + class StackSummary(list): """A list of FrameSummary objects, representing a stack of frames.""" @@ -496,18 +541,33 @@ class StackSummary(list): result.append(FrameSummary(filename, lineno, name, line=line)) return result - def format_frame_summary(self, frame_summary): + 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>" - row.append(' File "{}", line {}, in {}\n'.format( - filename, frame_summary.lineno, frame_summary.name)) + 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 @@ -619,7 +679,31 @@ class StackSummary(list): carets.append(secondary_char) else: carets.append(primary_char) - result.append("".join(carets) + "\n") + 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) @@ -643,7 +727,7 @@ class StackSummary(list): return ''.join(row) - def format(self): + def format(self, **kwargs): """Format the stack ready for printing. Returns a list of strings ready for printing. Each string in the @@ -655,13 +739,14 @@ class StackSummary(list): 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) + 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 @@ -1118,7 +1203,7 @@ class TracebackException: def __str__(self): return self._str - def format_exception_only(self, *, show_group=False, _depth=0): + 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. @@ -1135,10 +1220,11 @@ class TracebackException: :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) + yield indent + _format_final_exc_line(None, self._str, colorize=colorize) return stype = self.exc_type_str @@ -1146,16 +1232,16 @@ class TracebackException: if _depth > 0: # Nested exceptions needs correct handling of multiline messages. formatted = _format_final_exc_line( - stype, self._str, insert_final_newline=False, + 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) + yield _format_final_exc_line(stype, self._str, colorize=colorize) else: - yield from [indent + l for l in self._format_syntax_error(stype)] + yield from [indent + l for l in self._format_syntax_error(stype, colorize=colorize)] if ( isinstance(self.__notes__, collections.abc.Sequence) @@ -1169,15 +1255,26 @@ class TracebackException: if self.exceptions and show_group: for ex in self.exceptions: - yield from ex.format_exception_only(show_group=show_group, _depth=_depth+1) + yield from ex.format_exception_only(show_group=show_group, _depth=_depth+1, colorize=colorize) - def _format_syntax_error(self, stype): + 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: - yield ' File "{}", line {}\n'.format( - self.filename or "<string>", self.lineno) + 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) @@ -1189,9 +1286,9 @@ class TracebackException: rtext = text.rstrip('\n') ltext = rtext.lstrip(' \n\f') spaces = len(rtext) - len(ltext) - yield ' {}\n'.format(ltext) - - if self.offset is not None: + 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): @@ -1204,14 +1301,43 @@ class TracebackException: # 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]) - yield ' {}{}'.format("".join(caretspace), ('^' * (end_colno - colno) + "\n")) + 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>" - yield "{}: {}{}\n".format(stype, msg, filename_suffix) + 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): + def format(self, *, chain=True, _ctx=None, **kwargs): """Format the exception. If chain is not *True*, *__cause__* and *__context__* will not be formatted. @@ -1223,7 +1349,7 @@ class TracebackException: 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() @@ -1253,8 +1379,8 @@ class TracebackException: 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()) - yield from _ctx.emit(exc.format_exception_only()) + 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( @@ -1269,9 +1395,9 @@ class TracebackException: 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()) + yield from _ctx.emit(exc.stack.format(colorize=colorize)) - yield from _ctx.emit(exc.format_exception_only()) + 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 @@ -1312,11 +1438,12 @@ class TracebackException: _ctx.exception_group_depth = 0 - def print(self, *, file=None, chain=True): + 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): + for line in self.format(chain=chain, colorize=colorize): print(line, file=file, end="") |