def get_key_values(self):
filtered_values = itertools.chain.from_iterable(
(f.values()
for f in self._definition_class.get_filters(is_instance=True)))
return ValueSet({
create_simple_object(self.inference_state, v.string_name)
for v in filtered_values
})
def infer(self):
if self._string_value is not None:
s = self._string_value
if self.parent_context.inference_state.environment.version_info.major == 2 \
and not isinstance(s, bytes):
s = s.encode('utf-8')
return ValueSet([
create_simple_object(self.parent_context.inference_state, s)
])
return compiled.get_string_value_set(self.parent_context.inference_state)
def infer_factor(value_set, operator):
"""
Calculates `+`, `-`, `~` and `not` prefixes.
"""
for value in value_set:
if operator == '-':
if is_number(value):
yield value.negate()
elif operator == 'not':
b = value.py__bool__()
if b is None: # Uncertainty.
return
yield compiled.create_simple_object(value.inference_state, not b)
else:
yield value
def get_key_values(self):
values = NO_VALUES
if self.array_type == 'dict':
for i, (key, instance) in enumerate(self._arguments.unpack()):
if key is None and i == 0:
values |= ValueSet.from_sets(v.get_key_values()
for v in instance.infer()
if v.array_type == 'dict')
if key:
values |= ValueSet([
compiled.create_simple_object(
self.inference_state,
key,
)
])
return values
def py__getattribute__alternatives(self, string_name):
'''
Since nothing was inferred, now check the __getattr__ and
__getattribute__ methods. Stubs don't need to be checked, because
they don't contain any logic.
'''
if self.is_stub():
return NO_VALUES
name = compiled.create_simple_object(self.inference_state, string_name)
# This is a little bit special. `__getattribute__` is in Python
# executed before `__getattr__`. But: I know no use case, where
# this could be practical and where Medi would return wrong types.
# If you ever find something, let me know!
# We are inversing this, because a hand-crafted `__getattribute__`
# could still call another hand-crafted `__getattr__`, but not the
# other way around.
if is_big_annoying_library(self.parent_context):
return NO_VALUES
names = (self.get_function_slot_names(u'__getattr__')
or self.get_function_slot_names(u'__getattribute__'))
return self.execute_function_slots(names, name)
def infer_atom(context, atom):
"""
Basically to process ``atom`` nodes. The parser sometimes doesn't
generate the node (because it has just one child). In that case an atom
might be a name or a literal as well.
"""
state = context.inference_state
if atom.type == 'name':
if atom.value in ('True', 'False', 'None'):
# Python 2...
return ValueSet([compiled.builtin_from_name(state, atom.value)])
# This is the first global lookup.
stmt = tree.search_ancestor(
atom, 'expr_stmt', 'lambdef'
) or atom
if stmt.type == 'lambdef':
stmt = atom
position = stmt.start_pos
if _is_annotation_name(atom):
# Since Python 3.7 (with from __future__ import annotations),
# annotations are essentially strings and can reference objects
# that are defined further down in code. Therefore just set the
# position to None, so the finder will not try to stop at a certain
# position in the module.
position = None
return context.py__getattribute__(atom, position=position)
elif atom.type == 'keyword':
# For False/True/None
if atom.value in ('False', 'True', 'None'):
return ValueSet([compiled.builtin_from_name(state, atom.value)])
elif atom.value == 'print':
# print e.g. could be inferred like this in Python 2.7
return NO_VALUES
elif atom.value == 'yield':
# Contrary to yield from, yield can just appear alone to return a
# value when used with `.send()`.
return NO_VALUES
assert False, 'Cannot infer the keyword %s' % atom
elif isinstance(atom, tree.Literal):
string = state.compiled_subprocess.safe_literal_eval(atom.value)
return ValueSet([compiled.create_simple_object(state, string)])
elif atom.type == 'strings':
# Will be multiple string.
value_set = infer_atom(context, atom.children[0])
for string in atom.children[1:]:
right = infer_atom(context, string)
value_set = _infer_comparison(context, value_set, u'+', right)
return value_set
elif atom.type == 'fstring':
return compiled.get_string_value_set(state)
else:
c = atom.children
# Parentheses without commas are not tuples.
if c[0] == '(' and not len(c) == 2 \
and not(c[1].type == 'testlist_comp'
and len(c[1].children) > 1):
return context.infer_node(c[1])
try:
comp_for = c[1].children[1]
except (IndexError, AttributeError):
pass
else:
if comp_for == ':':
# Dict comprehensions have a colon at the 3rd index.
try:
comp_for = c[1].children[3]
except IndexError:
pass
if comp_for.type in ('comp_for', 'sync_comp_for'):
return ValueSet([iterable.comprehension_from_atom(
state, context, atom
)])
# It's a dict/list/tuple literal.
array_node = c[1]
try:
array_node_c = array_node.children
except AttributeError:
array_node_c = []
if c[0] == '{' and (array_node == '}' or ':' in array_node_c
or '**' in array_node_c):
new_value = iterable.DictLiteralValue(state, context, atom)
else:
new_value = iterable.SequenceLiteralValue(state, context, atom)
return ValueSet([new_value])