Add a listener to this tree
Add a listener to this tree
Return the index'th child of parent
Return the index'th child of parent
Return the number of children this 'parent' has
Return the number of children this 'parent' has
Return the index of the given child
Return the index of the given child
Return the root node
Return the root node
Test whether the given node is a leaf
Test whether the given node is a leaf
Return a list of children for the given node.
we ignore this message for now
we ignore this message for now
Tree model for abstract syntax trees