import ast import inspect import os import re import sys import traceback from inspect import CO_VARARGS from inspect import CO_VARKEYWORDS from io import StringIO from pathlib import Path from traceback import format_exception_only from types import CodeType from types import FrameType from types import TracebackType from typing import Any from typing import Callable from typing import ClassVar from typing import Dict from typing import Generic from typing import Iterable from typing import List from typing import Mapping from typing import Optional from typing import overload from typing import Pattern from typing import Sequence from typing import Set from typing import Tuple from typing import Type from typing import TYPE_CHECKING from typing import TypeVar from typing import Union from weakref import ref import attr import pluggy import _pytest from _pytest._code.source import findsource from _pytest._code.source import getrawcode from _pytest._code.source import getstatementrange_ast from _pytest._code.source import Source from _pytest._io import TerminalWriter from _pytest._io.saferepr import safeformat from _pytest._io.saferepr import saferepr from _pytest.compat import final from _pytest.compat import get_real_func from _pytest.deprecated import check_ispytest from _pytest.pathlib import absolutepath from _pytest.pathlib import bestrelpath if TYPE_CHECKING: from typing_extensions import Literal from typing_extensions import SupportsIndex from weakref import ReferenceType _TracebackStyle = Literal["long", "short", "line", "no", "native", "value", "auto"] if sys.version_info[:2] < (3, 11): from exceptiongroup import BaseExceptionGroup class Code: """Wrapper around Python code objects.""" __slots__ = ("raw",) def __init__(self, obj: CodeType) -> None: self.raw = obj @classmethod def from_function(cls, obj: object) -> "Code": return cls(getrawcode(obj)) def __eq__(self, other): return self.raw == other.raw # Ignore type because of https://github.com/python/mypy/issues/4266. __hash__ = None # type: ignore @property def firstlineno(self) -> int: return self.raw.co_firstlineno - 1 @property def name(self) -> str: return self.raw.co_name @property def path(self) -> Union[Path, str]: """Return a path object pointing to source code, or an ``str`` in case of ``OSError`` / non-existing file.""" if not self.raw.co_filename: return "" try: p = absolutepath(self.raw.co_filename) # maybe don't try this checking if not p.exists(): raise OSError("path check failed.") return p except OSError: # XXX maybe try harder like the weird logic # in the standard lib [linecache.updatecache] does? return self.raw.co_filename @property def fullsource(self) -> Optional["Source"]: """Return a _pytest._code.Source object for the full source file of the code.""" full, _ = findsource(self.raw) return full def source(self) -> "Source": """Return a _pytest._code.Source object for the code object's source only.""" # return source only for that part of code return Source(self.raw) def getargs(self, var: bool = False) -> Tuple[str, ...]: """Return a tuple with the argument names for the code object. If 'var' is set True also return the names of the variable and keyword arguments when present. """ # Handy shortcut for getting args. raw = self.raw argcount = raw.co_argcount if var: argcount += raw.co_flags & CO_VARARGS argcount += raw.co_flags & CO_VARKEYWORDS return raw.co_varnames[:argcount] class Frame: """Wrapper around a Python frame holding f_locals and f_globals in which expressions can be evaluated.""" __slots__ = ("raw",) def __init__(self, frame: FrameType) -> None: self.raw = frame @property def lineno(self) -> int: return self.raw.f_lineno - 1 @property def f_globals(self) -> Dict[str, Any]: return self.raw.f_globals @property def f_locals(self) -> Dict[str, Any]: return self.raw.f_locals @property def code(self) -> Code: return Code(self.raw.f_code) @property def statement(self) -> "Source": """Statement this frame is at.""" if self.code.fullsource is None: return Source("") return self.code.fullsource.getstatement(self.lineno) def eval(self, code, **vars): """Evaluate 'code' in the frame. 'vars' are optional additional local variables. Returns the result of the evaluation. """ f_locals = self.f_locals.copy() f_locals.update(vars) return eval(code, self.f_globals, f_locals) def repr(self, object: object) -> str: """Return a 'safe' (non-recursive, one-line) string repr for 'object'.""" return saferepr(object) def getargs(self, var: bool = False): """Return a list of tuples (name, value) for all arguments. If 'var' is set True, also include the variable and keyword arguments when present. """ retval = [] for arg in self.code.getargs(var): try: retval.append((arg, self.f_locals[arg])) except KeyError: pass # this can occur when using Psyco return retval class TracebackEntry: """A single entry in a Traceback.""" __slots__ = ("_rawentry", "_excinfo", "_repr_style") def __init__( self, rawentry: TracebackType, excinfo: Optional["ReferenceType[ExceptionInfo[BaseException]]"] = None, ) -> None: self._rawentry = rawentry self._excinfo = excinfo self._repr_style: Optional['Literal["short", "long"]'] = None @property def lineno(self) -> int: return self._rawentry.tb_lineno - 1 def set_repr_style(self, mode: "Literal['short', 'long']") -> None: assert mode in ("short", "long") self._repr_style = mode @property def frame(self) -> Frame: return Frame(self._rawentry.tb_frame) @property def relline(self) -> int: return self.lineno - self.frame.code.firstlineno def __repr__(self) -> str: return "" % (self.frame.code.path, self.lineno + 1) @property def statement(self) -> "Source": """_pytest._code.Source object for the current statement.""" source = self.frame.code.fullsource assert source is not None return source.getstatement(self.lineno) @property def path(self) -> Union[Path, str]: """Path to the source code.""" return self.frame.code.path @property def locals(self) -> Dict[str, Any]: """Locals of underlying frame.""" return self.frame.f_locals def getfirstlinesource(self) -> int: return self.frame.code.firstlineno def getsource( self, astcache: Optional[Dict[Union[str, Path], ast.AST]] = None ) -> Optional["Source"]: """Return failing source code.""" # we use the passed in astcache to not reparse asttrees # within exception info printing source = self.frame.code.fullsource if source is None: return None key = astnode = None if astcache is not None: key = self.frame.code.path if key is not None: astnode = astcache.get(key, None) start = self.getfirstlinesource() try: astnode, _, end = getstatementrange_ast( self.lineno, source, astnode=astnode ) except SyntaxError: end = self.lineno + 1 else: if key is not None and astcache is not None: astcache[key] = astnode return source[start:end] source = property(getsource) def ishidden(self) -> bool: """Return True if the current frame has a var __tracebackhide__ resolving to True. If __tracebackhide__ is a callable, it gets called with the ExceptionInfo instance and can decide whether to hide the traceback. Mostly for internal use. """ tbh: Union[ bool, Callable[[Optional[ExceptionInfo[BaseException]]], bool] ] = False for maybe_ns_dct in (self.frame.f_locals, self.frame.f_globals): # in normal cases, f_locals and f_globals are dictionaries # however via `exec(...)` / `eval(...)` they can be other types # (even incorrect types!). # as such, we suppress all exceptions while accessing __tracebackhide__ try: tbh = maybe_ns_dct["__tracebackhide__"] except Exception: pass else: break if tbh and callable(tbh): return tbh(None if self._excinfo is None else self._excinfo()) return tbh def __str__(self) -> str: name = self.frame.code.name try: line = str(self.statement).lstrip() except KeyboardInterrupt: raise except BaseException: line = "???" # This output does not quite match Python's repr for traceback entries, # but changing it to do so would break certain plugins. See # https://github.com/pytest-dev/pytest/pull/7535/ for details. return " File %r:%d in %s\n %s\n" % ( str(self.path), self.lineno + 1, name, line, ) @property def name(self) -> str: """co_name of underlying code.""" return self.frame.code.raw.co_name class Traceback(List[TracebackEntry]): """Traceback objects encapsulate and offer higher level access to Traceback entries.""" def __init__( self, tb: Union[TracebackType, Iterable[TracebackEntry]], excinfo: Optional["ReferenceType[ExceptionInfo[BaseException]]"] = None, ) -> None: """Initialize from given python traceback object and ExceptionInfo.""" self._excinfo = excinfo if isinstance(tb, TracebackType): def f(cur: TracebackType) -> Iterable[TracebackEntry]: cur_: Optional[TracebackType] = cur while cur_ is not None: yield TracebackEntry(cur_, excinfo=excinfo) cur_ = cur_.tb_next super().__init__(f(tb)) else: super().__init__(tb) def cut( self, path: Optional[Union["os.PathLike[str]", str]] = None, lineno: Optional[int] = None, firstlineno: Optional[int] = None, excludepath: Optional["os.PathLike[str]"] = None, ) -> "Traceback": """Return a Traceback instance wrapping part of this Traceback. By providing any combination of path, lineno and firstlineno, the first frame to start the to-be-returned traceback is determined. This allows cutting the first part of a Traceback instance e.g. for formatting reasons (removing some uninteresting bits that deal with handling of the exception/traceback). """ path_ = None if path is None else os.fspath(path) excludepath_ = None if excludepath is None else os.fspath(excludepath) for x in self: code = x.frame.code codepath = code.path if path is not None and str(codepath) != path_: continue if ( excludepath is not None and isinstance(codepath, Path) and excludepath_ in (str(p) for p in codepath.parents) # type: ignore[operator] ): continue if lineno is not None and x.lineno != lineno: continue if firstlineno is not None and x.frame.code.firstlineno != firstlineno: continue return Traceback(x._rawentry, self._excinfo) return self @overload def __getitem__(self, key: "SupportsIndex") -> TracebackEntry: ... @overload def __getitem__(self, key: slice) -> "Traceback": ... def __getitem__( self, key: Union["SupportsIndex", slice] ) -> Union[TracebackEntry, "Traceback"]: if isinstance(key, slice): return self.__class__(super().__getitem__(key)) else: return super().__getitem__(key) def filter( self, fn: Callable[[TracebackEntry], bool] = lambda x: not x.ishidden() ) -> "Traceback": """Return a Traceback instance with certain items removed fn is a function that gets a single argument, a TracebackEntry instance, and should return True when the item should be added to the Traceback, False when not. By default this removes all the TracebackEntries which are hidden (see ishidden() above). """ return Traceback(filter(fn, self), self._excinfo) def getcrashentry(self) -> TracebackEntry: """Return last non-hidden traceback entry that lead to the exception of a traceback.""" for i in range(-1, -len(self) - 1, -1): entry = self[i] if not entry.ishidden(): return entry return self[-1] def recursionindex(self) -> Optional[int]: """Return the index of the frame/TracebackEntry where recursion originates if appropriate, None if no recursion occurred.""" cache: Dict[Tuple[Any, int, int], List[Dict[str, Any]]] = {} for i, entry in enumerate(self): # id for the code.raw is needed to work around # the strange metaprogramming in the decorator lib from pypi # which generates code objects that have hash/value equality # XXX needs a test key = entry.frame.code.path, id(entry.frame.code.raw), entry.lineno # print "checking for recursion at", key values = cache.setdefault(key, []) if values: f = entry.frame loc = f.f_locals for otherloc in values: if otherloc == loc: return i values.append(entry.frame.f_locals) return None E = TypeVar("E", bound=BaseException, covariant=True) @final @attr.s(repr=False, init=False, auto_attribs=True) class ExceptionInfo(Generic[E]): """Wraps sys.exc_info() objects and offers help for navigating the traceback.""" _assert_start_repr: ClassVar = "AssertionError('assert " _excinfo: Optional[Tuple[Type["E"], "E", TracebackType]] _striptext: str _traceback: Optional[Traceback] def __init__( self, excinfo: Optional[Tuple[Type["E"], "E", TracebackType]], striptext: str = "", traceback: Optional[Traceback] = None, *, _ispytest: bool = False, ) -> None: check_ispytest(_ispytest) self._excinfo = excinfo self._striptext = striptext self._traceback = traceback @classmethod def from_exc_info( cls, exc_info: Tuple[Type[E], E, TracebackType], exprinfo: Optional[str] = None, ) -> "ExceptionInfo[E]": """Return an ExceptionInfo for an existing exc_info tuple. .. warning:: Experimental API :param exprinfo: A text string helping to determine if we should strip ``AssertionError`` from the output. Defaults to the exception message/``__str__()``. """ _striptext = "" if exprinfo is None and isinstance(exc_info[1], AssertionError): exprinfo = getattr(exc_info[1], "msg", None) if exprinfo is None: exprinfo = saferepr(exc_info[1]) if exprinfo and exprinfo.startswith(cls._assert_start_repr): _striptext = "AssertionError: " return cls(exc_info, _striptext, _ispytest=True) @classmethod def from_current( cls, exprinfo: Optional[str] = None ) -> "ExceptionInfo[BaseException]": """Return an ExceptionInfo matching the current traceback. .. warning:: Experimental API :param exprinfo: A text string helping to determine if we should strip ``AssertionError`` from the output. Defaults to the exception message/``__str__()``. """ tup = sys.exc_info() assert tup[0] is not None, "no current exception" assert tup[1] is not None, "no current exception" assert tup[2] is not None, "no current exception" exc_info = (tup[0], tup[1], tup[2]) return ExceptionInfo.from_exc_info(exc_info, exprinfo) @classmethod def for_later(cls) -> "ExceptionInfo[E]": """Return an unfilled ExceptionInfo.""" return cls(None, _ispytest=True) def fill_unfilled(self, exc_info: Tuple[Type[E], E, TracebackType]) -> None: """Fill an unfilled ExceptionInfo created with ``for_later()``.""" assert self._excinfo is None, "ExceptionInfo was already filled" self._excinfo = exc_info @property def type(self) -> Type[E]: """The exception class.""" assert ( self._excinfo is not None ), ".type can only be used after the context manager exits" return self._excinfo[0] @property def value(self) -> E: """The exception value.""" assert ( self._excinfo is not None ), ".value can only be used after the context manager exits" return self._excinfo[1] @property def tb(self) -> TracebackType: """The exception raw traceback.""" assert ( self._excinfo is not None ), ".tb can only be used after the context manager exits" return self._excinfo[2] @property def typename(self) -> str: """The type name of the exception.""" assert ( self._excinfo is not None ), ".typename can only be used after the context manager exits" return self.type.__name__ @property def traceback(self) -> Traceback: """The traceback.""" if self._traceback is None: self._traceback = Traceback(self.tb, excinfo=ref(self)) return self._traceback @traceback.setter def traceback(self, value: Traceback) -> None: self._traceback = value def __repr__(self) -> str: if self._excinfo is None: return "" return "<{} {} tblen={}>".format( self.__class__.__name__, saferepr(self._excinfo[1]), len(self.traceback) ) def exconly(self, tryshort: bool = False) -> str: """Return the exception as a string. When 'tryshort' resolves to True, and the exception is an AssertionError, only the actual exception part of the exception representation is returned (so 'AssertionError: ' is removed from the beginning). """ lines = format_exception_only(self.type, self.value) text = "".join(lines) text = text.rstrip() if tryshort: if text.startswith(self._striptext): text = text[len(self._striptext) :] return text def errisinstance( self, exc: Union[Type[BaseException], Tuple[Type[BaseException], ...]] ) -> bool: """Return True if the exception is an instance of exc. Consider using ``isinstance(excinfo.value, exc)`` instead. """ return isinstance(self.value, exc) def _getreprcrash(self) -> "ReprFileLocation": exconly = self.exconly(tryshort=True) entry = self.traceback.getcrashentry() path, lineno = entry.frame.code.raw.co_filename, entry.lineno return ReprFileLocation(path, lineno + 1, exconly) def getrepr( self, showlocals: bool = False, style: "_TracebackStyle" = "long", abspath: bool = False, tbfilter: bool = True, funcargs: bool = False, truncate_locals: bool = True, chain: bool = True, ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]: """Return str()able representation of this exception info. :param bool showlocals: Show locals per traceback entry. Ignored if ``style=="native"``. :param str style: long|short|no|native|value traceback style. :param bool abspath: If paths should be changed to absolute or left unchanged. :param bool tbfilter: Hide entries that contain a local variable ``__tracebackhide__==True``. Ignored if ``style=="native"``. :param bool funcargs: Show fixtures ("funcargs" for legacy purposes) per traceback entry. :param bool truncate_locals: With ``showlocals==True``, make sure locals can be safely represented as strings. :param bool chain: If chained exceptions in Python 3 should be shown. .. versionchanged:: 3.9 Added the ``chain`` parameter. """ if style == "native": return ReprExceptionInfo( ReprTracebackNative( traceback.format_exception( self.type, self.value, self.traceback[0]._rawentry ) ), self._getreprcrash(), ) fmt = FormattedExcinfo( showlocals=showlocals, style=style, abspath=abspath, tbfilter=tbfilter, funcargs=funcargs, truncate_locals=truncate_locals, chain=chain, ) return fmt.repr_excinfo(self) def match(self, regexp: Union[str, Pattern[str]]) -> "Literal[True]": """Check whether the regular expression `regexp` matches the string representation of the exception using :func:`python:re.search`. If it matches `True` is returned, otherwise an `AssertionError` is raised. """ __tracebackhide__ = True value = str(self.value) msg = f"Regex pattern did not match.\n Regex: {regexp!r}\n Input: {value!r}" if regexp == value: msg += "\n Did you mean to `re.escape()` the regex?" assert re.search(regexp, value), msg # Return True to allow for "assert excinfo.match()". return True @attr.s(auto_attribs=True) class FormattedExcinfo: """Presenting information about failing Functions and Generators.""" # for traceback entries flow_marker: ClassVar = ">" fail_marker: ClassVar = "E" showlocals: bool = False style: "_TracebackStyle" = "long" abspath: bool = True tbfilter: bool = True funcargs: bool = False truncate_locals: bool = True chain: bool = True astcache: Dict[Union[str, Path], ast.AST] = attr.ib( factory=dict, init=False, repr=False ) def _getindent(self, source: "Source") -> int: # Figure out indent for the given source. try: s = str(source.getstatement(len(source) - 1)) except KeyboardInterrupt: raise except BaseException: try: s = str(source[-1]) except KeyboardInterrupt: raise except BaseException: return 0 return 4 + (len(s) - len(s.lstrip())) def _getentrysource(self, entry: TracebackEntry) -> Optional["Source"]: source = entry.getsource(self.astcache) if source is not None: source = source.deindent() return source def repr_args(self, entry: TracebackEntry) -> Optional["ReprFuncArgs"]: if self.funcargs: args = [] for argname, argvalue in entry.frame.getargs(var=True): args.append((argname, saferepr(argvalue))) return ReprFuncArgs(args) return None def get_source( self, source: Optional["Source"], line_index: int = -1, excinfo: Optional[ExceptionInfo[BaseException]] = None, short: bool = False, ) -> List[str]: """Return formatted and marked up source lines.""" lines = [] if source is None or line_index >= len(source.lines): source = Source("???") line_index = 0 if line_index < 0: line_index += len(source) space_prefix = " " if short: lines.append(space_prefix + source.lines[line_index].strip()) else: for line in source.lines[:line_index]: lines.append(space_prefix + line) lines.append(self.flow_marker + " " + source.lines[line_index]) for line in source.lines[line_index + 1 :]: lines.append(space_prefix + line) if excinfo is not None: indent = 4 if short else self._getindent(source) lines.extend(self.get_exconly(excinfo, indent=indent, markall=True)) return lines def get_exconly( self, excinfo: ExceptionInfo[BaseException], indent: int = 4, markall: bool = False, ) -> List[str]: lines = [] indentstr = " " * indent # Get the real exception information out. exlines = excinfo.exconly(tryshort=True).split("\n") failindent = self.fail_marker + indentstr[1:] for line in exlines: lines.append(failindent + line) if not markall: failindent = indentstr return lines def repr_locals(self, locals: Mapping[str, object]) -> Optional["ReprLocals"]: if self.showlocals: lines = [] keys = [loc for loc in locals if loc[0] != "@"] keys.sort() for name in keys: value = locals[name] if name == "__builtins__": lines.append("__builtins__ = ") else: # This formatting could all be handled by the # _repr() function, which is only reprlib.Repr in # disguise, so is very configurable. if self.truncate_locals: str_repr = saferepr(value) else: str_repr = safeformat(value) # if len(str_repr) < 70 or not isinstance(value, (list, tuple, dict)): lines.append(f"{name:<10} = {str_repr}") # else: # self._line("%-10s =\\" % (name,)) # # XXX # pprint.pprint(value, stream=self.excinfowriter) return ReprLocals(lines) return None def repr_traceback_entry( self, entry: TracebackEntry, excinfo: Optional[ExceptionInfo[BaseException]] = None, ) -> "ReprEntry": lines: List[str] = [] style = entry._repr_style if entry._repr_style is not None else self.style if style in ("short", "long"): source = self._getentrysource(entry) if source is None: source = Source("???") line_index = 0 else: line_index = entry.lineno - entry.getfirstlinesource() short = style == "short" reprargs = self.repr_args(entry) if not short else None s = self.get_source(source, line_index, excinfo, short=short) lines.extend(s) if short: message = "in %s" % (entry.name) else: message = excinfo and excinfo.typename or "" entry_path = entry.path path = self._makepath(entry_path) reprfileloc = ReprFileLocation(path, entry.lineno + 1, message) localsrepr = self.repr_locals(entry.locals) return ReprEntry(lines, reprargs, localsrepr, reprfileloc, style) elif style == "value": if excinfo: lines.extend(str(excinfo.value).split("\n")) return ReprEntry(lines, None, None, None, style) else: if excinfo: lines.extend(self.get_exconly(excinfo, indent=4)) return ReprEntry(lines, None, None, None, style) def _makepath(self, path: Union[Path, str]) -> str: if not self.abspath and isinstance(path, Path): try: np = bestrelpath(Path.cwd(), path) except OSError: return str(path) if len(np) < len(str(path)): return np return str(path) def repr_traceback(self, excinfo: ExceptionInfo[BaseException]) -> "ReprTraceback": traceback = excinfo.traceback if self.tbfilter: traceback = traceback.filter() if isinstance(excinfo.value, RecursionError): traceback, extraline = self._truncate_recursive_traceback(traceback) else: extraline = None last = traceback[-1] entries = [] if self.style == "value": reprentry = self.repr_traceback_entry(last, excinfo) entries.append(reprentry) return ReprTraceback(entries, None, style=self.style) for index, entry in enumerate(traceback): einfo = (last == entry) and excinfo or None reprentry = self.repr_traceback_entry(entry, einfo) entries.append(reprentry) return ReprTraceback(entries, extraline, style=self.style) def _truncate_recursive_traceback( self, traceback: Traceback ) -> Tuple[Traceback, Optional[str]]: """Truncate the given recursive traceback trying to find the starting point of the recursion. The detection is done by going through each traceback entry and finding the point in which the locals of the frame are equal to the locals of a previous frame (see ``recursionindex()``). Handle the situation where the recursion process might raise an exception (for example comparing numpy arrays using equality raises a TypeError), in which case we do our best to warn the user of the error and show a limited traceback. """ try: recursionindex = traceback.recursionindex() except Exception as e: max_frames = 10 extraline: Optional[str] = ( "!!! Recursion error detected, but an error occurred locating the origin of recursion.\n" " The following exception happened when comparing locals in the stack frame:\n" " {exc_type}: {exc_msg}\n" " Displaying first and last {max_frames} stack frames out of {total}." ).format( exc_type=type(e).__name__, exc_msg=str(e), max_frames=max_frames, total=len(traceback), ) # Type ignored because adding two instances of a List subtype # currently incorrectly has type List instead of the subtype. traceback = traceback[:max_frames] + traceback[-max_frames:] # type: ignore else: if recursionindex is not None: extraline = "!!! Recursion detected (same locals & position)" traceback = traceback[: recursionindex + 1] else: extraline = None return traceback, extraline def repr_excinfo( self, excinfo: ExceptionInfo[BaseException] ) -> "ExceptionChainRepr": repr_chain: List[ Tuple[ReprTraceback, Optional[ReprFileLocation], Optional[str]] ] = [] e: Optional[BaseException] = excinfo.value excinfo_: Optional[ExceptionInfo[BaseException]] = excinfo descr = None seen: Set[int] = set() while e is not None and id(e) not in seen: seen.add(id(e)) if excinfo_: # Fall back to native traceback as a temporary workaround until # full support for exception groups added to ExceptionInfo. # See https://github.com/pytest-dev/pytest/issues/9159 if isinstance(e, BaseExceptionGroup): reprtraceback: Union[ ReprTracebackNative, ReprTraceback ] = ReprTracebackNative( traceback.format_exception( type(excinfo_.value), excinfo_.value, excinfo_.traceback[0]._rawentry, ) ) else: reprtraceback = self.repr_traceback(excinfo_) reprcrash: Optional[ReprFileLocation] = ( excinfo_._getreprcrash() if self.style != "value" else None ) else: # Fallback to native repr if the exception doesn't have a traceback: # ExceptionInfo objects require a full traceback to work. reprtraceback = ReprTracebackNative( traceback.format_exception(type(e), e, None) ) reprcrash = None repr_chain += [(reprtraceback, reprcrash, descr)] if e.__cause__ is not None and self.chain: e = e.__cause__ excinfo_ = ( ExceptionInfo.from_exc_info((type(e), e, e.__traceback__)) if e.__traceback__ else None ) descr = "The above exception was the direct cause of the following exception:" elif ( e.__context__ is not None and not e.__suppress_context__ and self.chain ): e = e.__context__ excinfo_ = ( ExceptionInfo.from_exc_info((type(e), e, e.__traceback__)) if e.__traceback__ else None ) descr = "During handling of the above exception, another exception occurred:" else: e = None repr_chain.reverse() return ExceptionChainRepr(repr_chain) @attr.s(eq=False, auto_attribs=True) class TerminalRepr: def __str__(self) -> str: # FYI this is called from pytest-xdist's serialization of exception # information. io = StringIO() tw = TerminalWriter(file=io) self.toterminal(tw) return io.getvalue().strip() def __repr__(self) -> str: return f"<{self.__class__} instance at {id(self):0x}>" def toterminal(self, tw: TerminalWriter) -> None: raise NotImplementedError() # This class is abstract -- only subclasses are instantiated. @attr.s(eq=False) class ExceptionRepr(TerminalRepr): # Provided by subclasses. reprcrash: Optional["ReprFileLocation"] reprtraceback: "ReprTraceback" def __attrs_post_init__(self) -> None: self.sections: List[Tuple[str, str, str]] = [] def addsection(self, name: str, content: str, sep: str = "-") -> None: self.sections.append((name, content, sep)) def toterminal(self, tw: TerminalWriter) -> None: for name, content, sep in self.sections: tw.sep(sep, name) tw.line(content) @attr.s(eq=False, auto_attribs=True) class ExceptionChainRepr(ExceptionRepr): chain: Sequence[Tuple["ReprTraceback", Optional["ReprFileLocation"], Optional[str]]] def __attrs_post_init__(self) -> None: super().__attrs_post_init__() # reprcrash and reprtraceback of the outermost (the newest) exception # in the chain. self.reprtraceback = self.chain[-1][0] self.reprcrash = self.chain[-1][1] def toterminal(self, tw: TerminalWriter) -> None: for element in self.chain: element[0].toterminal(tw) if element[2] is not None: tw.line("") tw.line(element[2], yellow=True) super().toterminal(tw) @attr.s(eq=False, auto_attribs=True) class ReprExceptionInfo(ExceptionRepr): reprtraceback: "ReprTraceback" reprcrash: "ReprFileLocation" def toterminal(self, tw: TerminalWriter) -> None: self.reprtraceback.toterminal(tw) super().toterminal(tw) @attr.s(eq=False, auto_attribs=True) class ReprTraceback(TerminalRepr): reprentries: Sequence[Union["ReprEntry", "ReprEntryNative"]] extraline: Optional[str] style: "_TracebackStyle" entrysep: ClassVar = "_ " def toterminal(self, tw: TerminalWriter) -> None: # The entries might have different styles. for i, entry in enumerate(self.reprentries): if entry.style == "long": tw.line("") entry.toterminal(tw) if i < len(self.reprentries) - 1: next_entry = self.reprentries[i + 1] if ( entry.style == "long" or entry.style == "short" and next_entry.style == "long" ): tw.sep(self.entrysep) if self.extraline: tw.line(self.extraline) class ReprTracebackNative(ReprTraceback): def __init__(self, tblines: Sequence[str]) -> None: self.style = "native" self.reprentries = [ReprEntryNative(tblines)] self.extraline = None @attr.s(eq=False, auto_attribs=True) class ReprEntryNative(TerminalRepr): lines: Sequence[str] style: ClassVar["_TracebackStyle"] = "native" def toterminal(self, tw: TerminalWriter) -> None: tw.write("".join(self.lines)) @attr.s(eq=False, auto_attribs=True) class ReprEntry(TerminalRepr): lines: Sequence[str] reprfuncargs: Optional["ReprFuncArgs"] reprlocals: Optional["ReprLocals"] reprfileloc: Optional["ReprFileLocation"] style: "_TracebackStyle" def _write_entry_lines(self, tw: TerminalWriter) -> None: """Write the source code portions of a list of traceback entries with syntax highlighting. Usually entries are lines like these: " x = 1" "> assert x == 2" "E assert 1 == 2" This function takes care of rendering the "source" portions of it (the lines without the "E" prefix) using syntax highlighting, taking care to not highlighting the ">" character, as doing so might break line continuations. """ if not self.lines: return # separate indents and source lines that are not failures: we want to # highlight the code but not the indentation, which may contain markers # such as "> assert 0" fail_marker = f"{FormattedExcinfo.fail_marker} " indent_size = len(fail_marker) indents: List[str] = [] source_lines: List[str] = [] failure_lines: List[str] = [] for index, line in enumerate(self.lines): is_failure_line = line.startswith(fail_marker) if is_failure_line: # from this point on all lines are considered part of the failure failure_lines.extend(self.lines[index:]) break else: if self.style == "value": source_lines.append(line) else: indents.append(line[:indent_size]) source_lines.append(line[indent_size:]) tw._write_source(source_lines, indents) # failure lines are always completely red and bold for line in failure_lines: tw.line(line, bold=True, red=True) def toterminal(self, tw: TerminalWriter) -> None: if self.style == "short": assert self.reprfileloc is not None self.reprfileloc.toterminal(tw) self._write_entry_lines(tw) if self.reprlocals: self.reprlocals.toterminal(tw, indent=" " * 8) return if self.reprfuncargs: self.reprfuncargs.toterminal(tw) self._write_entry_lines(tw) if self.reprlocals: tw.line("") self.reprlocals.toterminal(tw) if self.reprfileloc: if self.lines: tw.line("") self.reprfileloc.toterminal(tw) def __str__(self) -> str: return "{}\n{}\n{}".format( "\n".join(self.lines), self.reprlocals, self.reprfileloc ) @attr.s(eq=False, auto_attribs=True) class ReprFileLocation(TerminalRepr): path: str = attr.ib(converter=str) lineno: int message: str def toterminal(self, tw: TerminalWriter) -> None: # Filename and lineno output for each entry, using an output format # that most editors understand. msg = self.message i = msg.find("\n") if i != -1: msg = msg[:i] tw.write(self.path, bold=True, red=True) tw.line(f":{self.lineno}: {msg}") @attr.s(eq=False, auto_attribs=True) class ReprLocals(TerminalRepr): lines: Sequence[str] def toterminal(self, tw: TerminalWriter, indent="") -> None: for line in self.lines: tw.line(indent + line) @attr.s(eq=False, auto_attribs=True) class ReprFuncArgs(TerminalRepr): args: Sequence[Tuple[str, object]] def toterminal(self, tw: TerminalWriter) -> None: if self.args: linesofar = "" for name, value in self.args: ns = f"{name} = {value}" if len(ns) + len(linesofar) + 2 > tw.fullwidth: if linesofar: tw.line(linesofar) linesofar = ns else: if linesofar: linesofar += ", " + ns else: linesofar = ns if linesofar: tw.line(linesofar) tw.line("") def getfslineno(obj: object) -> Tuple[Union[str, Path], int]: """Return source location (path, lineno) for the given object. If the source cannot be determined return ("", -1). The line number is 0-based. """ # xxx let decorators etc specify a sane ordering # NOTE: this used to be done in _pytest.compat.getfslineno, initially added # in 6ec13a2b9. It ("place_as") appears to be something very custom. obj = get_real_func(obj) if hasattr(obj, "place_as"): obj = obj.place_as # type: ignore[attr-defined] try: code = Code.from_function(obj) except TypeError: try: fn = inspect.getsourcefile(obj) or inspect.getfile(obj) # type: ignore[arg-type] except TypeError: return "", -1 fspath = fn and absolutepath(fn) or "" lineno = -1 if fspath: try: _, lineno = findsource(obj) except OSError: pass return fspath, lineno return code.path, code.firstlineno # Relative paths that we use to filter traceback entries from appearing to the user; # see filter_traceback. # note: if we need to add more paths than what we have now we should probably use a list # for better maintenance. _PLUGGY_DIR = Path(pluggy.__file__.rstrip("oc")) # pluggy is either a package or a single module depending on the version if _PLUGGY_DIR.name == "__init__.py": _PLUGGY_DIR = _PLUGGY_DIR.parent _PYTEST_DIR = Path(_pytest.__file__).parent def filter_traceback(entry: TracebackEntry) -> bool: """Return True if a TracebackEntry instance should be included in tracebacks. We hide traceback entries of: * dynamically generated code (no code to show up for it); * internal traceback from pytest or its internal libraries, py and pluggy. """ # entry.path might sometimes return a str object when the entry # points to dynamically generated code. # See https://bitbucket.org/pytest-dev/py/issues/71. raw_filename = entry.frame.code.raw.co_filename is_generated = "<" in raw_filename and ">" in raw_filename if is_generated: return False # entry.path might point to a non-existing file, in which case it will # also return a str object. See #1133. p = Path(entry.path) parents = p.parents if _PLUGGY_DIR in parents: return False if _PYTEST_DIR in parents: return False return True