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astroid
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nodes
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scoped_nodes
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mixin.py
# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html # For details: https://github.com/PyCQA/astroid/blob/main/LICENSE # Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt """This module contains mixin classes for scoped nodes.""" from __future__ import annotations from typing import TYPE_CHECKING, TypeVar, overload from astroid.filter_statements import _filter_stmts from astroid.nodes import node_classes, scoped_nodes from astroid.nodes.scoped_nodes.utils import builtin_lookup from astroid.typing import SuccessfulInferenceResult if TYPE_CHECKING: from astroid import nodes _T = TypeVar("_T") class LocalsDictNodeNG(node_classes.LookupMixIn): """this class provides locals handling common to Module, FunctionDef and ClassDef nodes, including a dict like interface for direct access to locals information """ # attributes below are set by the builder module or by raw factories locals: dict[str, list[SuccessfulInferenceResult]] = {} """A map of the name of a local variable to the node defining the local.""" def qname(self) -> str: """Get the 'qualified' name of the node. For example: module.name, module.class.name ... :returns: The qualified name. :rtype: str """ # pylint: disable=no-member; github.com/pycqa/astroid/issues/278 if self.parent is None: return self.name return f"{self.parent.frame(future=True).qname()}.{self.name}" def scope(self: _T) -> _T: """The first parent node defining a new scope. :returns: The first parent scope node. :rtype: Module or FunctionDef or ClassDef or Lambda or GenExpr """ return self def scope_lookup(self, node, name: str, offset: int = 0): """Lookup where the given variable is assigned. :param node: The node to look for assignments up to. Any assignments after the given node are ignored. :type node: NodeNG :param name: The name of the variable to find assignments for. :param offset: The line offset to filter statements up to. :returns: This scope node and the list of assignments associated to the given name according to the scope where it has been found (locals, globals or builtin). :rtype: tuple(str, list(NodeNG)) """ raise NotImplementedError def _scope_lookup(self, node, name, offset=0): """XXX method for interfacing the scope lookup""" try: stmts = _filter_stmts(node, self.locals[name], self, offset) except KeyError: stmts = () if stmts: return self, stmts # Handle nested scopes: since class names do not extend to nested # scopes (e.g., methods), we find the next enclosing non-class scope pscope = self.parent and self.parent.scope() while pscope is not None: if not isinstance(pscope, scoped_nodes.ClassDef): return pscope.scope_lookup(node, name) pscope = pscope.parent and pscope.parent.scope() # self is at the top level of a module, or is enclosed only by ClassDefs return builtin_lookup(name) def set_local(self, name: str, stmt: nodes.NodeNG) -> None: """Define that the given name is declared in the given statement node. .. seealso:: :meth:`scope` :param name: The name that is being defined. :param stmt: The statement that defines the given name. """ # assert not stmt in self.locals.get(name, ()), (self, stmt) self.locals.setdefault(name, []).append(stmt) __setitem__ = set_local def _append_node(self, child: nodes.NodeNG) -> None: """append a child, linking it in the tree""" # pylint: disable=no-member; depending by the class # which uses the current class as a mixin or base class. # It's rewritten in 2.0, so it makes no sense for now # to spend development time on it. self.body.append(child) # type: ignore[attr-defined] child.parent = self @overload def add_local_node( self, child_node: nodes.ClassDef, name: str | None = ... ) -> None: ... @overload def add_local_node(self, child_node: nodes.NodeNG, name: str) -> None: ... def add_local_node(self, child_node: nodes.NodeNG, name: str | None = None) -> None: """Append a child that should alter the locals of this scope node. :param child_node: The child node that will alter locals. :param name: The name of the local that will be altered by the given child node. """ if name != "__class__": # add __class__ node as a child will cause infinite recursion later! self._append_node(child_node) self.set_local(name or child_node.name, child_node) # type: ignore[attr-defined] def __getitem__(self, item: str) -> SuccessfulInferenceResult: """The first node the defines the given local. :param item: The name of the locally defined object. :raises KeyError: If the name is not defined. """ return self.locals[item][0] def __iter__(self): """Iterate over the names of locals defined in this scoped node. :returns: The names of the defined locals. :rtype: iterable(str) """ return iter(self.keys()) def keys(self): """The names of locals defined in this scoped node. :returns: The names of the defined locals. :rtype: list(str) """ return list(self.locals.keys()) def values(self): """The nodes that define the locals in this scoped node. :returns: The nodes that define locals. :rtype: list(NodeNG) """ # pylint: disable=consider-using-dict-items # It look like this class override items/keys/values, # probably not worth the headache return [self[key] for key in self.keys()] def items(self): """Get the names of the locals and the node that defines the local. :returns: The names of locals and their associated node. :rtype: list(tuple(str, NodeNG)) """ return list(zip(self.keys(), self.values())) def __contains__(self, name) -> bool: """Check if a local is defined in this scope. :param name: The name of the local to check for. :type name: str :returns: Whether this node has a local of the given name, """ return name in self.locals class ComprehensionScope(LocalsDictNodeNG): """Scoping for different types of comprehensions.""" scope_lookup = LocalsDictNodeNG._scope_lookup generators: list[nodes.Comprehension] """The generators that are looped through."""
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