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import pprint
import reprlib
from typing import Any
from typing import Dict
from typing import IO
from typing import Optional
def _try_repr_or_str(obj: object) -> str:
try:
return repr(obj)
except (KeyboardInterrupt, SystemExit):
raise
except BaseException:
return '{}("{}")'.format(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 = "unpresentable exception ({})".format(_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):
"""subclass of repr.Repr that limits the resulting size of repr()
and includes information on exceptions raised during the call.
"""
def __init__(self, maxsize: int) -> None:
super().__init__()
self.maxstring = maxsize
self.maxsize = maxsize
def repr(self, x: object) -> str:
try:
s = super().repr(x)
except (KeyboardInterrupt, SystemExit):
raise
except BaseException as exc:
s = _format_repr_exception(exc, x)
return _ellipsize(s, self.maxsize)
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)
return _ellipsize(s, self.maxsize)
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)
def saferepr(obj: object, maxsize: int = 240) -> 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 standard 2.6 lib.
"""
return SafeRepr(maxsize).repr(obj)
class AlwaysDispatchingPrettyPrinter(pprint.PrettyPrinter):
"""PrettyPrinter that always dispatches (regardless of width)."""
def _format(
self,
object: object,
stream: IO[str],
indent: int,
allowance: int,
context: Dict[int, Any],
level: int,
) -> None:
# Type ignored because _dispatch is private.
p = self._dispatch.get(type(object).__repr__, None) # type: ignore[attr-defined]
objid = id(object)
if objid in context or p is None:
# Type ignored because _format is private.
super()._format( # type: ignore[misc]
object, stream, indent, allowance, context, level,
)
return
context[objid] = 1
p(self, object, stream, indent, allowance, context, level + 1)
del context[objid]
def _pformat_dispatch(
object: object,
indent: int = 1,
width: int = 80,
depth: Optional[int] = None,
*,
compact: bool = False
) -> str:
return AlwaysDispatchingPrettyPrinter(
indent=indent, width=width, depth=depth, compact=compact
).pformat(object)
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