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Diffstat (limited to 'venv/lib/python3.11/site-packages/jinja2/visitor.py')
-rw-r--r-- | venv/lib/python3.11/site-packages/jinja2/visitor.py | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/venv/lib/python3.11/site-packages/jinja2/visitor.py b/venv/lib/python3.11/site-packages/jinja2/visitor.py deleted file mode 100644 index 17c6aab..0000000 --- a/venv/lib/python3.11/site-packages/jinja2/visitor.py +++ /dev/null @@ -1,92 +0,0 @@ -"""API for traversing the AST nodes. Implemented by the compiler and -meta introspection. -""" -import typing as t - -from .nodes import Node - -if t.TYPE_CHECKING: - import typing_extensions as te - - class VisitCallable(te.Protocol): - def __call__(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any: - ... - - -class NodeVisitor: - """Walks the abstract syntax tree and call visitor functions for every - node found. The visitor functions may return values which will be - forwarded by the `visit` method. - - Per default the visitor functions for the nodes are ``'visit_'`` + - class name of the node. So a `TryFinally` node visit function would - be `visit_TryFinally`. This behavior can be changed by overriding - the `get_visitor` function. If no visitor function exists for a node - (return value `None`) the `generic_visit` visitor is used instead. - """ - - def get_visitor(self, node: Node) -> "t.Optional[VisitCallable]": - """Return the visitor function for this node or `None` if no visitor - exists for this node. In that case the generic visit function is - used instead. - """ - return getattr(self, f"visit_{type(node).__name__}", None) - - def visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any: - """Visit a node.""" - f = self.get_visitor(node) - - if f is not None: - return f(node, *args, **kwargs) - - return self.generic_visit(node, *args, **kwargs) - - def generic_visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any: - """Called if no explicit visitor function exists for a node.""" - for child_node in node.iter_child_nodes(): - self.visit(child_node, *args, **kwargs) - - -class NodeTransformer(NodeVisitor): - """Walks the abstract syntax tree and allows modifications of nodes. - - The `NodeTransformer` will walk the AST and use the return value of the - visitor functions to replace or remove the old node. If the return - value of the visitor function is `None` the node will be removed - from the previous location otherwise it's replaced with the return - value. The return value may be the original node in which case no - replacement takes place. - """ - - def generic_visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> Node: - for field, old_value in node.iter_fields(): - if isinstance(old_value, list): - new_values = [] - for value in old_value: - if isinstance(value, Node): - value = self.visit(value, *args, **kwargs) - if value is None: - continue - elif not isinstance(value, Node): - new_values.extend(value) - continue - new_values.append(value) - old_value[:] = new_values - elif isinstance(old_value, Node): - new_node = self.visit(old_value, *args, **kwargs) - if new_node is None: - delattr(node, field) - else: - setattr(node, field, new_node) - return node - - def visit_list(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.List[Node]: - """As transformers may return lists in some places this method - can be used to enforce a list as return value. - """ - rv = self.visit(node, *args, **kwargs) - - if not isinstance(rv, list): - return [rv] - - return rv |