org.antlr.runtime.tree

Class TreeVisitor

java.lang.Object

org.antlr.runtime.tree.TreeVisitor

public class TreeVisitor
extends Object

Do a depth first walk of a tree, applying pre() and post() actions as we discover and finish nodes.

Field Summary

Fields

Modifier and Type	Field and Description
protected TreeAdaptor	adaptor

Constructor Summary

Constructors

Constructor and Description
TreeVisitor()
TreeVisitor(TreeAdaptor adaptor)

Method Summary

Methods

Modifier and Type	Method and Description
Object	visit(Object t, TreeVisitorAction action) Visit every node in tree t and trigger an action for each node before/after having visited all of its children.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

adaptor

protected TreeAdaptor adaptor

Constructor Detail

TreeVisitor

public TreeVisitor(TreeAdaptor adaptor)

TreeVisitor

public TreeVisitor()

Method Detail

visit

public Object visit(Object t,
           TreeVisitorAction action)

Visit every node in tree t and trigger an action for each node before/after having visited all of its children. Execute both actions even if t has no children. If a child visit yields a new child, it can update its parent's child list or just return the new child. The child update code works even if the child visit alters its parent and returns the new tree. Return result of applying post action to this node.