mirror of
https://github.com/python/cpython.git
synced 2024-11-22 05:26:10 +01:00
68 lines
1.9 KiB
Python
68 lines
1.9 KiB
Python
__all__ = ()
|
|
|
|
import reprlib
|
|
|
|
from . import format_helpers
|
|
|
|
# States for Future.
|
|
_PENDING = 'PENDING'
|
|
_CANCELLED = 'CANCELLED'
|
|
_FINISHED = 'FINISHED'
|
|
|
|
|
|
def isfuture(obj):
|
|
"""Check for a Future.
|
|
|
|
This returns True when obj is a Future instance or is advertising
|
|
itself as duck-type compatible by setting _asyncio_future_blocking.
|
|
See comment in Future for more details.
|
|
"""
|
|
return (hasattr(obj.__class__, '_asyncio_future_blocking') and
|
|
obj._asyncio_future_blocking is not None)
|
|
|
|
|
|
def _format_callbacks(cb):
|
|
"""helper function for Future.__repr__"""
|
|
size = len(cb)
|
|
if not size:
|
|
cb = ''
|
|
|
|
def format_cb(callback):
|
|
return format_helpers._format_callback_source(callback, ())
|
|
|
|
if size == 1:
|
|
cb = format_cb(cb[0][0])
|
|
elif size == 2:
|
|
cb = '{}, {}'.format(format_cb(cb[0][0]), format_cb(cb[1][0]))
|
|
elif size > 2:
|
|
cb = '{}, <{} more>, {}'.format(format_cb(cb[0][0]),
|
|
size - 2,
|
|
format_cb(cb[-1][0]))
|
|
return f'cb=[{cb}]'
|
|
|
|
|
|
def _future_repr_info(future):
|
|
# (Future) -> str
|
|
"""helper function for Future.__repr__"""
|
|
info = [future._state.lower()]
|
|
if future._state == _FINISHED:
|
|
if future._exception is not None:
|
|
info.append(f'exception={future._exception!r}')
|
|
else:
|
|
# use reprlib to limit the length of the output, especially
|
|
# for very long strings
|
|
result = reprlib.repr(future._result)
|
|
info.append(f'result={result}')
|
|
if future._callbacks:
|
|
info.append(_format_callbacks(future._callbacks))
|
|
if future._source_traceback:
|
|
frame = future._source_traceback[-1]
|
|
info.append(f'created at {frame[0]}:{frame[1]}')
|
|
return info
|
|
|
|
|
|
@reprlib.recursive_repr()
|
|
def _future_repr(future):
|
|
info = ' '.join(_future_repr_info(future))
|
|
return f'<{future.__class__.__name__} {info}>'
|