com.google.javascript.jscomp
Class VariableVisibilityAnalysis

java.lang.Object
  com.google.javascript.jscomp.VariableVisibilityAnalysis

All Implemented Interfaces:

CompilerPass

public class VariableVisibilityAnalysis
extends Object
implements CompilerPass

An analysis pass that determines the visibility of variables -- that is, whether a variable is truly local, a local captured by an inner scope, a parameter, or a global variable. SideEffectsAnalysis uses this class to partition a potentially infinite number of concrete storage locations into a (small) finite number of abstract storage locations based on a variable's storage visibility.

VariableVisibilityAnalysis

public VariableVisibilityAnalysis(AbstractCompiler compiler)

getVariableVisibility

public com.google.javascript.jscomp.VariableVisibilityAnalysis.VariableVisibility getVariableVisibility(Node declaringNameNode)

Returns the visibility of of a variable, given that variable's declaring name node. The name node's parent must be one of:

    Token.VAR (for a variable declaration)
    Token.FUNCTION (for a function declaration)
    Token.LP (for a function formal parameter)
 

The returned visibility will be one of:

    LOCAL_VARIABLE : the variable is a local variable used only in its
        declared scope
    CAPTURED_LOCAL_VARIABLE : A local variable that is used in a capturing
        closure
     PARAMETER_VARIABLE : the variable is a formal parameter
     GLOBAL_VARIABLE : the variable is declared in the global scope
  

Parameters:

declaringNameNode - The name node for a declaration.

process

public void process(Node externs,
                    Node root)

Determines the visibility class for each variable in root.

Specified by:

process in interface CompilerPass

Parameters:

externs - Top of external JS tree

root - Top of JS tree

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