mako._ast_util.NodeVisitor

class documentation

class NodeVisitor: (source)

Known subclasses: mako._ast_util.NodeTransformer, mako._ast_util.SourceGenerator, mako.pyparser.FindIdentifiers, mako.pyparser.FindTuple, mako.pyparser.ParseFunc

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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. Don't use the `NodeVisitor` if you want to apply changes to nodes during traversing. For this a special visitor exists (`NodeTransformer`) that allows modifications.

Method	`generic_visit`	Called if no explicit visitor function exists for a node.
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): (source) ¶

overridden in mako._ast_util.NodeTransformer

Called if no explicit visitor function exists for a node.

def get_visitor(self, node): (source) ¶

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.

def visit(self, node): (source) ¶

Visit a node.