jltools.visit
Class FlattenVisitor

java.lang.Object
  |
  +--jltools.ast.NodeVisitor
        |
        +--jltools.visit.FlattenVisitor

public class FlattenVisitor

extends NodeVisitor

The FlattenVisitor flattens the AST,

Constructor Summary

FlattenVisitor(TypeSystem ts, NodeFactory nf)

Method Summary

NodeVisitor	enter(Node n) When entering a BlockStatement, place a new StatementList onto the stack
Node	leave(Node old, Node n, NodeVisitor v) Flatten complex expressions within the AST
Node	override(Node n) Given a tree rooted at n, the visitor has the option of overriding all traversal of the children of n.

Methods inherited from class jltools.ast.NodeVisitor

finish, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FlattenVisitor

public FlattenVisitor(TypeSystem ts,
                      NodeFactory nf)

Method Detail

override

public Node override(Node n)

Description copied from class: NodeVisitor

Given a tree rooted at n, the visitor has the option of overriding all traversal of the children of n. If no changes were made to n and the visitor wishes to prevent further traversal of the tree, then it should return n. If changes were made to the subtree, then the visitor should return a copy of n with appropriate changes. Finally, if the visitor does not wish to override traversal of the subtree rooted at n, then it should return null.

Overrides:

override in class NodeVisitor

Following copied from class: jltools.ast.NodeVisitor

Parameters:

n - The root of the subtree to be traversed.

Returns:

A node if normal traversal is to stop, null if it is to continue.

enter

public NodeVisitor enter(Node n)

When entering a BlockStatement, place a new StatementList onto the stack

Overrides:

enter in class NodeVisitor

Following copied from class: jltools.ast.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)

Flatten complex expressions within the AST

Overrides:

leave in class NodeVisitor

Following copied from class: jltools.ast.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.