import rope.base.evaluate
from rope.base import ast
class Arguments(object):
"""A class for evaluating parameters passed to a function
You can use the `create_arguments` factory. It handles implicit
first arguments.
"""
def __init__(self, args, scope):
self.args = args
self.scope = scope
self.instance = None
def get_arguments(self, parameters):
result = []
for pyname in self.get_pynames(parameters):
if pyname is None:
result.append(None)
else:
result.append(pyname.get_object())
return result
def get_pynames(self, parameters):
result = [None] * max(len(parameters), len(self.args))
for index, arg in enumerate(self.args):
if isinstance(arg, ast.keyword) and arg.arg in parameters:
result[parameters.index(arg.arg)] = self._evaluate(arg.value)
else:
result[index] = self._evaluate(arg)
return result
def get_instance_pyname(self):
if self.args:
return self._evaluate(self.args[0])
def _evaluate(self, ast_node):
return rope.base.evaluate.eval_node(self.scope, ast_node)
def create_arguments(primary, pyfunction, call_node, scope):
"""A factory for creating `Arguments`"""
args = list(call_node.args)
args.extend(call_node.keywords)
called = call_node.func
# XXX: Handle constructors
if _is_method_call(primary, pyfunction) and \
isinstance(called, ast.Attribute):
args.insert(0, called.value)
return Arguments(args, scope)
class ObjectArguments(object):
def __init__(self, pynames):
self.pynames = pynames
def get_arguments(self, parameters):
result = []
for pyname in self.pynames:
if pyname is None:
result.append(None)
else:
result.append(pyname.get_object())
return result
def get_pynames(self, parameters):
return self.pynames
def get_instance_pyname(self):
return self.pynames[0]
class MixedArguments(object):
def __init__(self, pyname, arguments, scope):
"""`argumens` is an instance of `Arguments`"""
self.pyname = pyname
self.args = arguments
def get_pynames(self, parameters):
return [self.pyname] + self.args.get_pynames(parameters[1:])
def get_arguments(self, parameters):
result = []
for pyname in self.get_pynames(parameters):
if pyname is None:
result.append(None)
else:
result.append(pyname.get_object())
return result
def get_instance_pyname(self):
return self.pyname
def _is_method_call(primary, pyfunction):
if primary is None:
return False
pyobject = primary.get_object()
if isinstance(pyobject.get_type(), rope.base.pyobjects.PyClass) and \
isinstance(pyfunction, rope.base.pyobjects.PyFunction) and \
isinstance(pyfunction.parent, rope.base.pyobjects.PyClass):
return True
if isinstance(pyobject.get_type(), rope.base.pyobjects.AbstractClass) and \
isinstance(pyfunction, rope.base.builtins.BuiltinFunction):
return True
return False
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