com.google.javascript.jscomp

Class RenameVars.ProcessVars

java.lang.Object

com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback

com.google.javascript.jscomp.RenameVars.ProcessVars

All Implemented Interfaces:

NodeTraversal.Callback, NodeTraversal.ScopedCallback

Enclosing class:

RenameVars

class RenameVars.ProcessVars
extends NodeTraversal.AbstractPostOrderCallback
implements NodeTraversal.ScopedCallback

Iterate through the nodes, collect all the NAME nodes that need to be renamed, and count how many times each variable name is referenced. There are 2 passes: - externs: keep track of the global vars in the externNames_ map. - source: keep track of all name references in globalNameNodes_, and localNameNodes_. To get shorter local variable renaming, we rename local variables to a temporary name "LOCAL_VAR_PREFIX + index" where index is the index of the variable declared in the local scope stack. e.g. Foo(fa, fb) { var c = function(d, e) { return fa; } } The indexes are: fa:0, fb:1, c:2, d:3, e:4 In that way, local variable names are reused in each global function. e.g. the final code might look like function x(a,b) { ... } function y(a,b,c) { ... }

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	isExternsPass_

Constructor Summary

Constructors

Constructor and Description
ProcessVars(boolean isExterns)

Method Summary

Modifier and Type	Method and Description
void	enterScope(NodeTraversal t) Called immediately after entering a new scope.
void	exitScope(NodeTraversal t) Called immediately before exiting a scope.
(package private) void	incCount(java.lang.String name)
void	visit(NodeTraversal t, Node n, Node parent) Visits a node in postorder (after its children have been visited).

Methods inherited from class com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback

shouldTraverse

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.javascript.jscomp.NodeTraversal.Callback

shouldTraverse

Field Detail

isExternsPass_

private final boolean isExternsPass_

Constructor Detail

ProcessVars

ProcessVars(boolean isExterns)

Method Detail

enterScope

public void enterScope(NodeTraversal t)

Description copied from interface: NodeTraversal.ScopedCallback

Called immediately after entering a new scope. The new scope can be accessed through t.getScope()

Specified by:

enterScope in interface NodeTraversal.ScopedCallback

exitScope

public void exitScope(NodeTraversal t)

Description copied from interface: NodeTraversal.ScopedCallback

Called immediately before exiting a scope. The ending scope can be accessed through t.getScope()

Specified by:

exitScope in interface NodeTraversal.ScopedCallback

visit

public void visit(NodeTraversal t,
                  Node n,
                  Node parent)

Description copied from interface: NodeTraversal.Callback

Visits a node in postorder (after its children have been visited). A node is visited only if all its parents should be traversed (NodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)).

Implementations can have side effects (e.g. modifying the parse tree).

Specified by:

visit in interface NodeTraversal.Callback

incCount

void incCount(java.lang.String name)