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.venv2/Lib/site-packages/_pytest/_io/saferepr.py

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+import pprint
+import reprlib
+from typing import Optional
+
+
+def _try_repr_or_str(obj: object) -> str:
+    try:
+        return repr(obj)
+    except (KeyboardInterrupt, SystemExit):
+        raise
+    except BaseException:
+        return f'{type(obj).__name__}("{obj}")'
+
+
+def _format_repr_exception(exc: BaseException, obj: object) -> str:
+    try:
+        exc_info = _try_repr_or_str(exc)
+    except (KeyboardInterrupt, SystemExit):
+        raise
+    except BaseException as exc:
+        exc_info = f"unpresentable exception ({_try_repr_or_str(exc)})"
+    return "<[{} raised in repr()] {} object at 0x{:x}>".format(
+        exc_info, type(obj).__name__, id(obj)
+    )
+
+
+def _ellipsize(s: str, maxsize: int) -> str:
+    if len(s) > maxsize:
+        i = max(0, (maxsize - 3) // 2)
+        j = max(0, maxsize - 3 - i)
+        return s[:i] + "..." + s[len(s) - j :]
+    return s
+
+
+class SafeRepr(reprlib.Repr):
+    """
+    repr.Repr that limits the resulting size of repr() and includes
+    information on exceptions raised during the call.
+    """
+
+    def __init__(self, maxsize: Optional[int], use_ascii: bool = False) -> None:
+        """
+        :param maxsize:
+            If not None, will truncate the resulting repr to that specific size, using ellipsis
+            somewhere in the middle to hide the extra text.
+            If None, will not impose any size limits on the returning repr.
+        """
+        super().__init__()
+        # ``maxstring`` is used by the superclass, and needs to be an int; using a
+        # very large number in case maxsize is None, meaning we want to disable
+        # truncation.
+        self.maxstring = maxsize if maxsize is not None else 1_000_000_000
+        self.maxsize = maxsize
+        self.use_ascii = use_ascii
+
+    def repr(self, x: object) -> str:
+        try:
+            if self.use_ascii:
+                s = ascii(x)
+            else:
+                s = super().repr(x)
+
+        except (KeyboardInterrupt, SystemExit):
+            raise
+        except BaseException as exc:
+            s = _format_repr_exception(exc, x)
+        if self.maxsize is not None:
+            s = _ellipsize(s, self.maxsize)
+        return s
+
+    def repr_instance(self, x: object, level: int) -> str:
+        try:
+            s = repr(x)
+        except (KeyboardInterrupt, SystemExit):
+            raise
+        except BaseException as exc:
+            s = _format_repr_exception(exc, x)
+        if self.maxsize is not None:
+            s = _ellipsize(s, self.maxsize)
+        return s
+
+
+def safeformat(obj: object) -> str:
+    """Return a pretty printed string for the given object.
+
+    Failing __repr__ functions of user instances will be represented
+    with a short exception info.
+    """
+    try:
+        return pprint.pformat(obj)
+    except Exception as exc:
+        return _format_repr_exception(exc, obj)
+
+
+# Maximum size of overall repr of objects to display during assertion errors.
+DEFAULT_REPR_MAX_SIZE = 240
+
+
+def saferepr(
+    obj: object, maxsize: Optional[int] = DEFAULT_REPR_MAX_SIZE, use_ascii: bool = False
+) -> str:
+    """Return a size-limited safe repr-string for the given object.
+
+    Failing __repr__ functions of user instances will be represented
+    with a short exception info and 'saferepr' generally takes
+    care to never raise exceptions itself.
+
+    This function is a wrapper around the Repr/reprlib functionality of the
+    stdlib.
+    """
+
+    return SafeRepr(maxsize, use_ascii).repr(obj)
+
+
+def saferepr_unlimited(obj: object, use_ascii: bool = True) -> str:
+    """Return an unlimited-size safe repr-string for the given object.
+
+    As with saferepr, failing __repr__ functions of user instances
+    will be represented with a short exception info.
+
+    This function is a wrapper around simple repr.
+
+    Note: a cleaner solution would be to alter ``saferepr``this way
+    when maxsize=None, but that might affect some other code.
+    """
+    try:
+        if use_ascii:
+            return ascii(obj)
+        return repr(obj)
+    except Exception as exc:
+        return _format_repr_exception(exc, obj)