polyglot.visit
Class DumpAst

java.lang.Object
  polyglot.visit.NodeVisitor
      polyglot.visit.DumpAst

public class DumpAst
extends NodeVisitor

Visitor which dumps the AST to a file.

Field Summary

protected java.io.Writer	fw
protected CodeWriter	w

Constructor Summary

DumpAst(CodeWriter w)

DumpAst(java.lang.String name, int width)

Method Summary

NodeVisitor	enter(Node n) Visit each node before traversal of children.
void	finish() The finish method is called after the entire tree has been visited.
Node	leave(Node old, Node n, NodeVisitor v) This method is called only after normal traversal of the children.

Methods inherited from class polyglot.visit.NodeVisitor

begin, enter, finish, leave, override, override, toString, visitEdge

Methods inherited from class java.lang.Object

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

Field Detail

fw

protected java.io.Writer fw

w

protected CodeWriter w

Constructor Detail

DumpAst

public DumpAst(java.lang.String name,
               int width)
        throws java.io.IOException

Throws:

java.io.IOException

DumpAst

public DumpAst(CodeWriter w)

Method Detail

enter

public NodeVisitor enter(Node n)

Visit each node before traversal of children. Call dump for that node. Then we begin a new CodeWriter block and traverse the children.

Overrides:

enter in class NodeVisitor

Parameters:

n - The root of the subtree to be traversed.

Returns:

The NodeVisitor which should be used to visit the children of n.

leave

public Node leave(Node old,
                  Node n,
                  NodeVisitor v)

This method is called only after normal traversal of the children. Thus we must end the CodeWriter block that was begun in enter.

Overrides:

leave in class NodeVisitor

Parameters:

old - The original state of root of the current subtree.

n - The current state of the root of the current subtree.

v - The NodeVisitor object used to visit the children.

Returns:

The final result of the traversal of the tree rooted at n.

finish

public void finish()

Description copied from class: NodeVisitor

The finish method is called after the entire tree has been visited. This method allows the visitor to perform any last minute cleanup, including flushing buffers and I/O connections.

Overrides:

finish in class NodeVisitor