def _startgen(self, chained):
"""
Obtain a flow variant from the chain iterator and call the
flow function. Note that a flow function is a generator if it
contains a yield statement, and an ordinary function
otherwise.
@param chained True if this is a chained (second or
subsequent) invocation.
@return The result of the call to the flow function (an
iterator or None).
@throws TypeError When chained is false, node parameters that
are neither matched by patterns nor accepted as arguments by
the flow function cause a TypeError.
"""
try:
flow = next(self._flowiter)
except StopIteration:
return None
function = flow.function
kwargs = {}
for key in self._attrs:
if util.takesArgument(function, key):
kwargs[key] = self._attrs[key]
elif not chained and key not in flow.patterns:
raise TypeError(
"{f}() got an unexpected keyword argument '{arg}'".format(
f=function.func_name, arg=key))
with self:
return function(self, **kwargs)
def _startgen(self, chained):
"""
Obtain a flow variant from the chain iterator and call the
flow function. Note that a flow function is a generator if it
contains a yield statement, and an ordinary function
otherwise.
@param chained True if this is a chained (second or
subsequent) invocation.
@return The result of the call to the flow function (an
iterator or None).
@throws TypeError When chained is false, node parameters that
are neither matched by patterns nor accepted as arguments by
the flow function cause a TypeError.
"""
try:
flow = next(self._flowiter)
except StopIteration:
return None
function = flow.function
kwargs = {}
for key in self._attrs:
if util.takesArgument(function, key):
kwargs[key] = self._attrs[key]
elif not chained and key not in flow.patterns:
raise TypeError("{f}() got an unexpected keyword argument '{arg}'".format(f=function.func_name, arg=key))
with self:
return function(self, **kwargs)
def _invoke(self, function, context):
"""
Call a configuration function or method.
@param function The configuration function or method.
@param context The context which should provide values for the
callable's keyword arguments.
"""
if context is not currentContext():
with context:
return self._invoke(function, context)
params = {}
for key in context:
if util.takesArgument(function, key):
params[key] = context[key]
return function(**params)
def _invoke(self, function, context):
"""
Call a configuration function or method.
@param function The configuration function or method.
@param context The context which should provide values for the
callable's keyword arguments.
"""
if context is not currentContext():
with context:
return self._invoke(function, context)
params = {}
for key in context:
if util.takesArgument(function, key):
params[key] = context[key]
return function(**params)
