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java.lang.Objectpolyglot.visit.NodeVisitor
polyglot.visit.AlphaRenamer
public class AlphaRenamer
The AlphaRenamer
runs over the AST and alpha-renames any local
variable declarations that it encounters.
Field Summary | |
---|---|
protected java.util.Set |
freshVars
|
protected NodeFactory |
nf
|
protected java.util.Map |
renamingMap
|
protected java.util.Stack |
setStack
|
Constructor Summary | |
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AlphaRenamer(NodeFactory nf)
Creates a visitor for alpha-renaming locals. |
Method Summary | |
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NodeVisitor |
enter(Node n)
Begin normal traversal of a subtree rooted at n . |
Node |
leave(Node old,
Node n,
NodeVisitor v)
This method is called after all of the children of n
have been visited. |
Methods inherited from class polyglot.visit.NodeVisitor |
---|
begin, enter, finish, 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 |
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protected NodeFactory nf
protected java.util.Stack setStack
protected java.util.Map renamingMap
protected java.util.Set freshVars
Constructor Detail |
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public AlphaRenamer(NodeFactory nf)
nf
- The node factory to be used when generating new nodes.Method Detail |
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public NodeVisitor enter(Node n)
NodeVisitor
n
. This gives
the visitor the option of changing internal state or returning a new
visitor which will be used to visit the children of n
.
This method is typically called by the method
enter(parent, n)
. If a subclass overrides the
method enter(parent, n)
then this method
may not be called.
enter
in class NodeVisitor
n
- The root of the subtree to be traversed.
NodeVisitor
which should be used to visit the
children of n
.public Node leave(Node old, Node n, NodeVisitor v)
NodeVisitor
n
have been visited. In this case, these children were visited by the
visitor v
. This is the last chance for the visitor to
modify the tree rooted at n
. This method will be called
exactly the same number of times as entry
is called.
That is, for each node that is not overriden, enter
and
leave
are each called exactly once.
Note that if old == n
then the vistior should make a copy
of n
before modifying it. It should then return the
modified copy.
This method is typically called by the method
leave(parent, old, n v)
.
If a subclass overrides the method
leave(parent, old, n v)
then this method may not be called.
leave
in class NodeVisitor
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.
n
.
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