@uml {@inheritDoc}
@uml {@inheritDoc}
@uml {@inheritDoc}
@uml {@inheritDoc}
Visit a parse tree, and return a user-defined result of the operation.
Visit the children of a node, and return a user-defined result of the operation.
Visit a terminal node, and return a user-defined result of the operation.
Visit an error node, and return a user-defined result of the operation.
TODO add class description