459 lines
15 KiB
Python
459 lines
15 KiB
Python
"""
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Values are the "values" that Python would return. However Values are at the
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same time also the "values" that a user is currently sitting in.
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A ValueSet is typically used to specify the return of a function or any other
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static analysis operation. In jedi there are always multiple returns and not
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just one.
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"""
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from functools import reduce
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from operator import add
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from parso.python.tree import Name
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from jedi import debug
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from jedi._compatibility import zip_longest, unicode
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from jedi.parser_utils import clean_scope_docstring
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from jedi.common import BaseValueSet, BaseValue
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from jedi.inference.helpers import SimpleGetItemNotFound
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from jedi.inference.utils import safe_property
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from jedi.inference.cache import inference_state_as_method_param_cache
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from jedi.cache import memoize_method
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sentinel = object()
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class HelperValueMixin(object):
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def get_root_context(self):
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value = self
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if value.parent_context is None:
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return value.as_context()
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while True:
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if value.parent_context is None:
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return value
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value = value.parent_context
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@classmethod
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@inference_state_as_method_param_cache()
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def create_cached(cls, *args, **kwargs):
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return cls(*args, **kwargs)
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def execute(self, arguments):
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return self.inference_state.execute(self, arguments=arguments)
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def execute_with_values(self, *value_list):
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from jedi.inference.arguments import ValuesArguments
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arguments = ValuesArguments([ValueSet([value]) for value in value_list])
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return self.inference_state.execute(self, arguments)
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def execute_annotation(self):
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return self.execute_with_values()
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def gather_annotation_classes(self):
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return ValueSet([self])
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def merge_types_of_iterate(self, contextualized_node=None, is_async=False):
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return ValueSet.from_sets(
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lazy_value.infer()
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for lazy_value in self.iterate(contextualized_node, is_async)
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)
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def _get_value_filters(self, name_or_str):
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origin_scope = name_or_str if isinstance(name_or_str, Name) else None
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for f in self.get_filters(origin_scope=origin_scope):
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yield f
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# This covers the case where a stub files are incomplete.
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if self.is_stub():
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from jedi.inference.gradual.conversion import convert_values
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for c in convert_values(ValueSet({self})):
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for f in c.get_filters():
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yield f
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def goto(self, name_or_str, name_context=None, analysis_errors=True):
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from jedi.inference import finder
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filters = self._get_value_filters(name_or_str)
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names = finder.filter_name(filters, name_or_str)
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debug.dbg('context.goto %s in (%s): %s', name_or_str, self, names)
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return names
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def py__getattribute__(self, name_or_str, name_context=None, position=None,
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analysis_errors=True):
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"""
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:param position: Position of the last statement -> tuple of line, column
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"""
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if name_context is None:
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name_context = self
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names = self.goto(name_or_str, name_context, analysis_errors)
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values = ValueSet.from_sets(name.infer() for name in names)
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if not values:
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n = name_or_str.value if isinstance(name_or_str, Name) else name_or_str
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values = self.py__getattribute__alternatives(n)
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if not names and not values and analysis_errors:
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if isinstance(name_or_str, Name):
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from jedi.inference import analysis
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analysis.add_attribute_error(
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name_context, self, name_or_str)
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debug.dbg('context.names_to_types: %s -> %s', names, values)
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return values
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def py__await__(self):
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await_value_set = self.py__getattribute__(u"__await__")
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if not await_value_set:
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debug.warning('Tried to run __await__ on value %s', self)
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return await_value_set.execute_with_values()
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def iterate(self, contextualized_node=None, is_async=False):
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debug.dbg('iterate %s', self)
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if is_async:
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from jedi.inference.lazy_value import LazyKnownValues
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# TODO if no __aiter__ values are there, error should be:
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# TypeError: 'async for' requires an object with __aiter__ method, got int
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return iter([
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LazyKnownValues(
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self.py__getattribute__('__aiter__').execute_with_values()
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.py__getattribute__('__anext__').execute_with_values()
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.py__getattribute__('__await__').execute_with_values()
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.py__stop_iteration_returns()
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) # noqa
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])
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return self.py__iter__(contextualized_node)
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def is_sub_class_of(self, class_value):
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for cls in self.py__mro__():
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if cls.is_same_class(class_value):
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return True
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return False
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def is_same_class(self, class2):
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# Class matching should prefer comparisons that are not this function.
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if type(class2).is_same_class != HelperValueMixin.is_same_class:
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return class2.is_same_class(self)
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return self == class2
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@memoize_method
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def as_context(self, *args, **kwargs):
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return self._as_context(*args, **kwargs)
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class Value(HelperValueMixin, BaseValue):
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"""
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To be implemented by subclasses.
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"""
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tree_node = None
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# Possible values: None, tuple, list, dict and set. Here to deal with these
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# very important containers.
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array_type = None
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@property
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def api_type(self):
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# By default just lower name of the class. Can and should be
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# overwritten.
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return self.__class__.__name__.lower()
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def py__getitem__(self, index_value_set, contextualized_node):
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from jedi.inference import analysis
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# TODO this value is probably not right.
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analysis.add(
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contextualized_node.context,
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'type-error-not-subscriptable',
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contextualized_node.node,
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message="TypeError: '%s' object is not subscriptable" % self
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)
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return NO_VALUES
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def py__simple_getitem__(self, index):
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raise SimpleGetItemNotFound
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def py__iter__(self, contextualized_node=None):
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if contextualized_node is not None:
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from jedi.inference import analysis
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analysis.add(
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contextualized_node.context,
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'type-error-not-iterable',
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contextualized_node.node,
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message="TypeError: '%s' object is not iterable" % self)
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return iter([])
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def get_signatures(self):
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return []
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def is_class(self):
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return False
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def is_instance(self):
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return False
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def is_function(self):
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return False
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def is_module(self):
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return False
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def is_namespace(self):
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return False
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def is_compiled(self):
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return False
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def is_bound_method(self):
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return False
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def is_builtins_module(self):
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return False
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def py__bool__(self):
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"""
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Since Wrapper is a super class for classes, functions and modules,
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the return value will always be true.
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"""
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return True
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def py__doc__(self):
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try:
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self.tree_node.get_doc_node
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except AttributeError:
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return ''
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else:
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return clean_scope_docstring(self.tree_node)
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def get_safe_value(self, default=sentinel):
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if default is sentinel:
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raise ValueError("There exists no safe value for value %s" % self)
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return default
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def execute_operation(self, other, operator):
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debug.warning("%s not possible between %s and %s", operator, self, other)
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return NO_VALUES
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def py__call__(self, arguments):
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debug.warning("no execution possible %s", self)
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return NO_VALUES
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def py__stop_iteration_returns(self):
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debug.warning("Not possible to return the stop iterations of %s", self)
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return NO_VALUES
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def py__getattribute__alternatives(self, name_or_str):
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"""
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For now a way to add values in cases like __getattr__.
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"""
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return NO_VALUES
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def py__get__(self, instance, class_value):
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debug.warning("No __get__ defined on %s", self)
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return ValueSet([self])
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def get_qualified_names(self):
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# Returns Optional[Tuple[str, ...]]
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return None
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def is_stub(self):
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# The root value knows if it's a stub or not.
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return self.parent_context.is_stub()
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def _as_context(self):
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raise NotImplementedError('Not all values need to be converted to contexts: %s', self)
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@property
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def name(self):
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raise NotImplementedError
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def py__name__(self):
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return self.name.string_name
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def get_type_hint(self, add_class_info=True):
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return None
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def iterate_values(values, contextualized_node=None, is_async=False):
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"""
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Calls `iterate`, on all values but ignores the ordering and just returns
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all values that the iterate functions yield.
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"""
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return ValueSet.from_sets(
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lazy_value.infer()
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for lazy_value in values.iterate(contextualized_node, is_async=is_async)
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)
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class _ValueWrapperBase(HelperValueMixin):
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@safe_property
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def name(self):
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from jedi.inference.names import ValueName
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wrapped_name = self._wrapped_value.name
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if wrapped_name.tree_name is not None:
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return ValueName(self, wrapped_name.tree_name)
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else:
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from jedi.inference.compiled import CompiledValueName
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return CompiledValueName(self, wrapped_name.string_name)
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@classmethod
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@inference_state_as_method_param_cache()
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def create_cached(cls, inference_state, *args, **kwargs):
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return cls(*args, **kwargs)
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def __getattr__(self, name):
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assert name != '_wrapped_value', 'Problem with _get_wrapped_value'
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return getattr(self._wrapped_value, name)
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class LazyValueWrapper(_ValueWrapperBase):
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@safe_property
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@memoize_method
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def _wrapped_value(self):
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with debug.increase_indent_cm('Resolve lazy value wrapper'):
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return self._get_wrapped_value()
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def __repr__(self):
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return '<%s>' % (self.__class__.__name__)
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def _get_wrapped_value(self):
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raise NotImplementedError
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class ValueWrapper(_ValueWrapperBase):
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def __init__(self, wrapped_value):
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self._wrapped_value = wrapped_value
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, self._wrapped_value)
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class TreeValue(Value):
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def __init__(self, inference_state, parent_context, tree_node):
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super(TreeValue, self).__init__(inference_state, parent_context)
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self.tree_node = tree_node
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def __repr__(self):
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return '<%s: %s>' % (self.__class__.__name__, self.tree_node)
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class ContextualizedNode(object):
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def __init__(self, context, node):
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self.context = context
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self.node = node
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def get_root_context(self):
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return self.context.get_root_context()
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def infer(self):
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return self.context.infer_node(self.node)
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def __repr__(self):
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return '<%s: %s in %s>' % (self.__class__.__name__, self.node, self.context)
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def _getitem(value, index_values, contextualized_node):
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# The actual getitem call.
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result = NO_VALUES
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unused_values = set()
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for index_value in index_values:
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index = index_value.get_safe_value(default=None)
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if type(index) in (float, int, str, unicode, slice, bytes):
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try:
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result |= value.py__simple_getitem__(index)
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continue
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except SimpleGetItemNotFound:
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pass
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unused_values.add(index_value)
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# The index was somehow not good enough or simply a wrong type.
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# Therefore we now iterate through all the values and just take
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# all results.
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if unused_values or not index_values:
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result |= value.py__getitem__(
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ValueSet(unused_values),
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contextualized_node
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)
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debug.dbg('py__getitem__ result: %s', result)
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return result
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class ValueSet(BaseValueSet):
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def py__class__(self):
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return ValueSet(c.py__class__() for c in self._set)
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def iterate(self, contextualized_node=None, is_async=False):
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from jedi.inference.lazy_value import get_merged_lazy_value
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type_iters = [c.iterate(contextualized_node, is_async=is_async) for c in self._set]
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for lazy_values in zip_longest(*type_iters):
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yield get_merged_lazy_value(
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[l for l in lazy_values if l is not None]
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)
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def execute(self, arguments):
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return ValueSet.from_sets(c.inference_state.execute(c, arguments) for c in self._set)
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def execute_with_values(self, *args, **kwargs):
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return ValueSet.from_sets(c.execute_with_values(*args, **kwargs) for c in self._set)
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def goto(self, *args, **kwargs):
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return reduce(add, [c.goto(*args, **kwargs) for c in self._set], [])
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def py__getattribute__(self, *args, **kwargs):
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return ValueSet.from_sets(c.py__getattribute__(*args, **kwargs) for c in self._set)
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def get_item(self, *args, **kwargs):
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return ValueSet.from_sets(_getitem(c, *args, **kwargs) for c in self._set)
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def try_merge(self, function_name):
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value_set = self.__class__([])
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for c in self._set:
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try:
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method = getattr(c, function_name)
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except AttributeError:
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pass
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else:
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value_set |= method()
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return value_set
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def gather_annotation_classes(self):
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return ValueSet.from_sets([c.gather_annotation_classes() for c in self._set])
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def get_signatures(self):
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return [sig for c in self._set for sig in c.get_signatures()]
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def get_type_hint(self, add_class_info=True):
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t = [v.get_type_hint(add_class_info=add_class_info) for v in self._set]
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type_hints = sorted(filter(None, t))
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if len(type_hints) == 1:
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return type_hints[0]
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optional = 'None' in type_hints
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if optional:
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type_hints.remove('None')
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if len(type_hints) == 0:
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return None
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elif len(type_hints) == 1:
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s = type_hints[0]
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else:
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s = 'Union[%s]' % ', '.join(type_hints)
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if optional:
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s = 'Optional[%s]' % s
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return s
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def infer_type_vars(self, value_set, is_class_value=False):
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# Circular
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from jedi.inference.gradual.annotation import merge_type_var_dicts
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type_var_dict = {}
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for value in self._set:
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merge_type_var_dicts(
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type_var_dict,
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value.infer_type_vars(value_set, is_class_value),
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)
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return type_var_dict
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NO_VALUES = ValueSet([])
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def iterator_to_value_set(func):
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def wrapper(*args, **kwargs):
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return ValueSet(func(*args, **kwargs))
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return wrapper
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