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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