mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-26 23:41:47 +01:00
300 lines
12 KiB
Python
300 lines
12 KiB
Python
# Copyright (c) 2015-2016, 2018-2020 Claudiu Popa <pcmanticore@gmail.com>
|
|
# Copyright (c) 2015-2016 Ceridwen <ceridwenv@gmail.com>
|
|
# Copyright (c) 2018 Bryce Guinta <bryce.paul.guinta@gmail.com>
|
|
# Copyright (c) 2018 Nick Drozd <nicholasdrozd@gmail.com>
|
|
# Copyright (c) 2018 Anthony Sottile <asottile@umich.edu>
|
|
|
|
# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
|
|
# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
|
|
|
|
|
|
from astroid import bases
|
|
from astroid import context as contextmod
|
|
from astroid import exceptions
|
|
from astroid import nodes
|
|
from astroid import util
|
|
|
|
|
|
class CallSite:
|
|
"""Class for understanding arguments passed into a call site
|
|
|
|
It needs a call context, which contains the arguments and the
|
|
keyword arguments that were passed into a given call site.
|
|
In order to infer what an argument represents, call :meth:`infer_argument`
|
|
with the corresponding function node and the argument name.
|
|
|
|
:param callcontext:
|
|
An instance of :class:`astroid.context.CallContext`, that holds
|
|
the arguments for the call site.
|
|
:param argument_context_map:
|
|
Additional contexts per node, passed in from :attr:`astroid.context.Context.extra_context`
|
|
:param context:
|
|
An instance of :class:`astroid.context.Context`.
|
|
"""
|
|
|
|
def __init__(self, callcontext, argument_context_map=None, context=None):
|
|
if argument_context_map is None:
|
|
argument_context_map = {}
|
|
self.argument_context_map = argument_context_map
|
|
args = callcontext.args
|
|
keywords = callcontext.keywords
|
|
self.duplicated_keywords = set()
|
|
self._unpacked_args = self._unpack_args(args, context=context)
|
|
self._unpacked_kwargs = self._unpack_keywords(keywords, context=context)
|
|
|
|
self.positional_arguments = [
|
|
arg for arg in self._unpacked_args if arg is not util.Uninferable
|
|
]
|
|
self.keyword_arguments = {
|
|
key: value
|
|
for key, value in self._unpacked_kwargs.items()
|
|
if value is not util.Uninferable
|
|
}
|
|
|
|
@classmethod
|
|
def from_call(cls, call_node, context=None):
|
|
"""Get a CallSite object from the given Call node.
|
|
|
|
:param context:
|
|
An instance of :class:`astroid.context.Context` that will be used
|
|
to force a single inference path.
|
|
"""
|
|
|
|
# Determine the callcontext from the given `context` object if any.
|
|
context = context or contextmod.InferenceContext()
|
|
callcontext = contextmod.CallContext(call_node.args, call_node.keywords)
|
|
return cls(callcontext, context=context)
|
|
|
|
def has_invalid_arguments(self):
|
|
"""Check if in the current CallSite were passed *invalid* arguments
|
|
|
|
This can mean multiple things. For instance, if an unpacking
|
|
of an invalid object was passed, then this method will return True.
|
|
Other cases can be when the arguments can't be inferred by astroid,
|
|
for example, by passing objects which aren't known statically.
|
|
"""
|
|
return len(self.positional_arguments) != len(self._unpacked_args)
|
|
|
|
def has_invalid_keywords(self):
|
|
"""Check if in the current CallSite were passed *invalid* keyword arguments
|
|
|
|
For instance, unpacking a dictionary with integer keys is invalid
|
|
(**{1:2}), because the keys must be strings, which will make this
|
|
method to return True. Other cases where this might return True if
|
|
objects which can't be inferred were passed.
|
|
"""
|
|
return len(self.keyword_arguments) != len(self._unpacked_kwargs)
|
|
|
|
def _unpack_keywords(self, keywords, context=None):
|
|
values = {}
|
|
context = context or contextmod.InferenceContext()
|
|
context.extra_context = self.argument_context_map
|
|
for name, value in keywords:
|
|
if name is None:
|
|
# Then it's an unpacking operation (**)
|
|
try:
|
|
inferred = next(value.infer(context=context))
|
|
except exceptions.InferenceError:
|
|
values[name] = util.Uninferable
|
|
continue
|
|
|
|
if not isinstance(inferred, nodes.Dict):
|
|
# Not something we can work with.
|
|
values[name] = util.Uninferable
|
|
continue
|
|
|
|
for dict_key, dict_value in inferred.items:
|
|
try:
|
|
dict_key = next(dict_key.infer(context=context))
|
|
except exceptions.InferenceError:
|
|
values[name] = util.Uninferable
|
|
continue
|
|
if not isinstance(dict_key, nodes.Const):
|
|
values[name] = util.Uninferable
|
|
continue
|
|
if not isinstance(dict_key.value, str):
|
|
values[name] = util.Uninferable
|
|
continue
|
|
if dict_key.value in values:
|
|
# The name is already in the dictionary
|
|
values[dict_key.value] = util.Uninferable
|
|
self.duplicated_keywords.add(dict_key.value)
|
|
continue
|
|
values[dict_key.value] = dict_value
|
|
else:
|
|
values[name] = value
|
|
return values
|
|
|
|
def _unpack_args(self, args, context=None):
|
|
values = []
|
|
context = context or contextmod.InferenceContext()
|
|
context.extra_context = self.argument_context_map
|
|
for arg in args:
|
|
if isinstance(arg, nodes.Starred):
|
|
try:
|
|
inferred = next(arg.value.infer(context=context))
|
|
except exceptions.InferenceError:
|
|
values.append(util.Uninferable)
|
|
continue
|
|
|
|
if inferred is util.Uninferable:
|
|
values.append(util.Uninferable)
|
|
continue
|
|
if not hasattr(inferred, "elts"):
|
|
values.append(util.Uninferable)
|
|
continue
|
|
values.extend(inferred.elts)
|
|
else:
|
|
values.append(arg)
|
|
return values
|
|
|
|
def infer_argument(self, funcnode, name, context):
|
|
"""infer a function argument value according to the call context
|
|
|
|
Arguments:
|
|
funcnode: The function being called.
|
|
name: The name of the argument whose value is being inferred.
|
|
context: Inference context object
|
|
"""
|
|
if name in self.duplicated_keywords:
|
|
raise exceptions.InferenceError(
|
|
"The arguments passed to {func!r} " " have duplicate keywords.",
|
|
call_site=self,
|
|
func=funcnode,
|
|
arg=name,
|
|
context=context,
|
|
)
|
|
|
|
# Look into the keywords first, maybe it's already there.
|
|
try:
|
|
return self.keyword_arguments[name].infer(context)
|
|
except KeyError:
|
|
pass
|
|
|
|
# Too many arguments given and no variable arguments.
|
|
if len(self.positional_arguments) > len(funcnode.args.args):
|
|
if not funcnode.args.vararg:
|
|
raise exceptions.InferenceError(
|
|
"Too many positional arguments "
|
|
"passed to {func!r} that does "
|
|
"not have *args.",
|
|
call_site=self,
|
|
func=funcnode,
|
|
arg=name,
|
|
context=context,
|
|
)
|
|
|
|
positional = self.positional_arguments[: len(funcnode.args.args)]
|
|
vararg = self.positional_arguments[len(funcnode.args.args) :]
|
|
argindex = funcnode.args.find_argname(name)[0]
|
|
kwonlyargs = {arg.name for arg in funcnode.args.kwonlyargs}
|
|
kwargs = {
|
|
key: value
|
|
for key, value in self.keyword_arguments.items()
|
|
if key not in kwonlyargs
|
|
}
|
|
# If there are too few positionals compared to
|
|
# what the function expects to receive, check to see
|
|
# if the missing positional arguments were passed
|
|
# as keyword arguments and if so, place them into the
|
|
# positional args list.
|
|
if len(positional) < len(funcnode.args.args):
|
|
for func_arg in funcnode.args.args:
|
|
if func_arg.name in kwargs:
|
|
arg = kwargs.pop(func_arg.name)
|
|
positional.append(arg)
|
|
|
|
if argindex is not None:
|
|
# 2. first argument of instance/class method
|
|
if argindex == 0 and funcnode.type in ("method", "classmethod"):
|
|
if context.boundnode is not None:
|
|
boundnode = context.boundnode
|
|
else:
|
|
# XXX can do better ?
|
|
boundnode = funcnode.parent.frame()
|
|
|
|
if isinstance(boundnode, nodes.ClassDef):
|
|
# Verify that we're accessing a method
|
|
# of the metaclass through a class, as in
|
|
# `cls.metaclass_method`. In this case, the
|
|
# first argument is always the class.
|
|
method_scope = funcnode.parent.scope()
|
|
if method_scope is boundnode.metaclass():
|
|
return iter((boundnode,))
|
|
|
|
if funcnode.type == "method":
|
|
if not isinstance(boundnode, bases.Instance):
|
|
boundnode = boundnode.instantiate_class()
|
|
return iter((boundnode,))
|
|
if funcnode.type == "classmethod":
|
|
return iter((boundnode,))
|
|
# if we have a method, extract one position
|
|
# from the index, so we'll take in account
|
|
# the extra parameter represented by `self` or `cls`
|
|
if funcnode.type in ("method", "classmethod"):
|
|
argindex -= 1
|
|
# 2. search arg index
|
|
try:
|
|
return self.positional_arguments[argindex].infer(context)
|
|
except IndexError:
|
|
pass
|
|
|
|
if funcnode.args.kwarg == name:
|
|
# It wants all the keywords that were passed into
|
|
# the call site.
|
|
if self.has_invalid_keywords():
|
|
raise exceptions.InferenceError(
|
|
"Inference failed to find values for all keyword arguments "
|
|
"to {func!r}: {unpacked_kwargs!r} doesn't correspond to "
|
|
"{keyword_arguments!r}.",
|
|
keyword_arguments=self.keyword_arguments,
|
|
unpacked_kwargs=self._unpacked_kwargs,
|
|
call_site=self,
|
|
func=funcnode,
|
|
arg=name,
|
|
context=context,
|
|
)
|
|
kwarg = nodes.Dict(
|
|
lineno=funcnode.args.lineno,
|
|
col_offset=funcnode.args.col_offset,
|
|
parent=funcnode.args,
|
|
)
|
|
kwarg.postinit(
|
|
[(nodes.const_factory(key), value) for key, value in kwargs.items()]
|
|
)
|
|
return iter((kwarg,))
|
|
if funcnode.args.vararg == name:
|
|
# It wants all the args that were passed into
|
|
# the call site.
|
|
if self.has_invalid_arguments():
|
|
raise exceptions.InferenceError(
|
|
"Inference failed to find values for all positional "
|
|
"arguments to {func!r}: {unpacked_args!r} doesn't "
|
|
"correspond to {positional_arguments!r}.",
|
|
positional_arguments=self.positional_arguments,
|
|
unpacked_args=self._unpacked_args,
|
|
call_site=self,
|
|
func=funcnode,
|
|
arg=name,
|
|
context=context,
|
|
)
|
|
args = nodes.Tuple(
|
|
lineno=funcnode.args.lineno,
|
|
col_offset=funcnode.args.col_offset,
|
|
parent=funcnode.args,
|
|
)
|
|
args.postinit(vararg)
|
|
return iter((args,))
|
|
|
|
# Check if it's a default parameter.
|
|
try:
|
|
return funcnode.args.default_value(name).infer(context)
|
|
except exceptions.NoDefault:
|
|
pass
|
|
raise exceptions.InferenceError(
|
|
"No value found for argument {name} to " "{func!r}",
|
|
call_site=self,
|
|
func=funcnode,
|
|
arg=name,
|
|
context=context,
|
|
)
|