com.google.javascript.jscomp

Class VariableReferenceCheck

java.lang.Object

com.google.javascript.jscomp.VariableReferenceCheck

All Implemented Interfaces:

CompilerPass, HotSwapCompilerPass

class VariableReferenceCheck
extends java.lang.Object
implements HotSwapCompilerPass

Checks variables to see if they are referenced before their declaration, or if they are redeclared in a way that is suspicious (i.e. not dictated by control structures). This is a more aggressive version of VarCheck, but it lacks the cross-module checks.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	VariableReferenceCheck.ReferenceCheckingBehavior Behavior that checks variables for redeclaration or early references just after they go out of scope.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static DiagnosticType	AMBIGUOUS_FUNCTION_DECL
private java.util.Set<ReferenceCollectingCallback.BasicBlock>	blocksWithDeclarations
private AbstractCompiler	compiler
(package private) static DiagnosticType	DECLARATION_NOT_DIRECTLY_IN_BLOCK
(package private) static DiagnosticType	EARLY_REFERENCE
(package private) static DiagnosticType	EARLY_REFERENCE_ERROR
(package private) static DiagnosticType	REASSIGNED_CONSTANT
(package private) static DiagnosticType	REDECLARED_VARIABLE
(package private) static DiagnosticType	REDECLARED_VARIABLE_ERROR
(package private) static DiagnosticType	UNUSED_LOCAL_ASSIGNMENT

Constructor Summary

Constructors

Constructor and Description
VariableReferenceCheck(AbstractCompiler compiler)

Method Summary

Modifier and Type	Method and Description
void	hotSwapScript(Node scriptRoot, Node originalRoot) Process the JS with root node root.
void	process(Node externs, Node root) Process the JS with root node root.

Methods inherited from class java.lang.Object

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

Field Detail

EARLY_REFERENCE

static final DiagnosticType EARLY_REFERENCE

REDECLARED_VARIABLE

static final DiagnosticType REDECLARED_VARIABLE

AMBIGUOUS_FUNCTION_DECL

static final DiagnosticType AMBIGUOUS_FUNCTION_DECL

EARLY_REFERENCE_ERROR

static final DiagnosticType EARLY_REFERENCE_ERROR

REASSIGNED_CONSTANT

static final DiagnosticType REASSIGNED_CONSTANT

REDECLARED_VARIABLE_ERROR

static final DiagnosticType REDECLARED_VARIABLE_ERROR

DECLARATION_NOT_DIRECTLY_IN_BLOCK

static final DiagnosticType DECLARATION_NOT_DIRECTLY_IN_BLOCK

UNUSED_LOCAL_ASSIGNMENT

static final DiagnosticType UNUSED_LOCAL_ASSIGNMENT

compiler

private final AbstractCompiler compiler

blocksWithDeclarations

private final java.util.Set<ReferenceCollectingCallback.BasicBlock> blocksWithDeclarations

Constructor Detail

VariableReferenceCheck

public VariableReferenceCheck(AbstractCompiler compiler)

Method Detail

process

public void process(Node externs,
                    Node root)

Description copied from interface: CompilerPass

Process the JS with root node root. Can modify the contents of each Node tree

Specified by:

process in interface CompilerPass

Parameters:

externs - Top of external JS tree

root - Top of JS tree

hotSwapScript

public void hotSwapScript(Node scriptRoot,
                          Node originalRoot)

Description copied from interface: HotSwapCompilerPass

Process the JS with root node root. This is supposed to be significantly faster compared to corresponding full-compiler passes.

Specified by:

hotSwapScript in interface HotSwapCompilerPass

Parameters:

scriptRoot - Root node corresponding to the file that is modified, should be of type Token.SCRIPT.

originalRoot - Root node corresponding to the original version of the file that is modified. Should be of type token.SCRIPT.