jinja2.visitor.NodeTransformer

class documentation

class NodeTransformer(NodeVisitor):

Known subclasses: jinja2.optimizer.Optimizer

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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.

Method generic​_visit Called if no explicit visitor function exists for a node.
Method visit​_list As transformers may return lists in some places this method can be used to enforce a list as return value.

Inherited from NodeVisitor:

Method get​_visitor 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.
Method visit Visit a node.
def generic_visit(self, node, *args, **kwargs):
overrides jinja2.visitor.NodeVisitor.generic_visit
overridden in jinja2.optimizer.Optimizer
Called if no explicit visitor function exists for a node.
Parameters
node:NodeUndocumented
*args:t.AnyUndocumented
**kwargs:t.AnyUndocumented
Returns
NodeUndocumented
def visit_list(self, node, *args, **kwargs):
As transformers may return lists in some places this method can be used to enforce a list as return value.
Parameters
node:NodeUndocumented
*args:t.AnyUndocumented
**kwargs:t.AnyUndocumented
Returns
t.List[Node]Undocumented