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Issue #16630: Make Idle calltips work even when __getattr__ raises.

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Initial patch by Roger Serwy.
This commit is contained in:
Terry Jan Reedy 2014-01-21 15:36:51 -05:00
parent 65fd0592fb
commit 715476d8e3
2 changed files with 50 additions and 36 deletions
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62
Lib/idlelib/CallTips.py
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@ -118,47 +118,49 @@ def get_entity(expression):
# The following are used in both get_argspec and tests
_first_param = re.compile('(?<=\()\w*\,?\s*')
_default_callable_argspec = "No docstring, see docs."
_default_callable_argspec = "See source or doc"
def get_argspec(ob):
'''Return a string describing the arguments and return of a callable object.
'''Return a string describing the signature of a callable object, or ''.
For Python-coded functions and methods, the first line is introspected.
Delete 'self' parameter for classes (.__init__) and bound methods.
The last line is the first line of the doc string. For builtins, this typically
includes the arguments in addition to the return value.
'''
argspec = ""
if hasattr(ob, '__call__'):
if isinstance(ob, type):
fob = getattr(ob, '__init__', None)
elif isinstance(ob.__call__, types.MethodType):
fob = ob.__call__
else:
fob = ob
if isinstance(fob, (types.FunctionType, types.MethodType)):
argspec = inspect.formatargspec(*inspect.getfullargspec(fob))
if (isinstance(ob, (type, types.MethodType)) or
isinstance(ob.__call__, types.MethodType)):
argspec = _first_param.sub("", argspec)
try:
ob_call = ob.__call__
except BaseException:
return argspec
if isinstance(ob, type):
fob = ob.__init__
elif isinstance(ob_call, types.MethodType):
fob = ob_call
else:
fob = ob
if isinstance(fob, (types.FunctionType, types.MethodType)):
argspec = inspect.formatargspec(*inspect.getfullargspec(fob))
if (isinstance(ob, (type, types.MethodType)) or
isinstance(ob_call, types.MethodType)):
argspec = _first_param.sub("", argspec)
if isinstance(ob.__call__, types.MethodType):
doc = ob.__call__.__doc__
else:
doc = getattr(ob, "__doc__", "")
if doc:
doc = doc.lstrip()
pos = doc.find("\n")
if pos < 0 or pos > 70:
pos = 70
if argspec:
argspec += "\n"
argspec += doc[:pos]
if not argspec:
argspec = _default_callable_argspec
if isinstance(ob_call, types.MethodType):
doc = ob_call.__doc__
else:
doc = getattr(ob, "__doc__", "")
if doc:
doc = doc.lstrip()
pos = doc.find("\n")
if pos < 0 or pos > 70:
pos = 70
if argspec:
argspec += "\n"
argspec += doc[:pos]
if not argspec:
argspec = _default_callable_argspec
return argspec
if __name__ == '__main__':
from unittest import main
main('idlelib.idle_test.test_calltips', verbosity=2, exit=False)
main('idlelib.idle_test.test_calltips', verbosity=2)