Package com.google.javascript.jscomp.lint

Class CheckPrimitiveAsObject

java.lang.Object

com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback

com.google.javascript.jscomp.lint.CheckPrimitiveAsObject

All Implemented Interfaces:

CompilerPass, NodeTraversal.Callback

public final class CheckPrimitiveAsObject
extends NodeTraversal.AbstractPostOrderCallback
implements CompilerPass

Check for explicit creation of the object equivalents of primitive types (e.g. Boolean instead of boolean) and their use in type declarations.

Using these is confusing and gives no benefit. For example, the result of typeof (new Boolean(true)) is "object". and the result of (new Boolean(false)) ? "true" : "false" is "true".

Field Summary

Fields

Modifier and Type	Field	Description
static final DiagnosticType	NEW_PRIMITIVE_OBJECT
static final DiagnosticType	PRIMITIVE_OBJECT_DECLARATION

Constructor Summary

Constructors

Constructor	Description
CheckPrimitiveAsObject(AbstractCompiler compiler)

Method Summary

Modifier and Type	Method	Description
void	process(Node externs, Node root)	Process the JS with root node root.
void	visit(NodeTraversal t, Node n, Node parent)	Visits a node in postorder (after its children).

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

Field Details

NEW_PRIMITIVE_OBJECT

public static final DiagnosticType NEW_PRIMITIVE_OBJECT

PRIMITIVE_OBJECT_DECLARATION

public static final DiagnosticType PRIMITIVE_OBJECT_DECLARATION

Constructor Details

CheckPrimitiveAsObject

public CheckPrimitiveAsObject(AbstractCompiler compiler)

Method Details

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

visit

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

Description copied from interface: NodeTraversal.Callback

Visits a node in postorder (after its children). A node is visited in postorder iff NodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node) returned true for its parent and itself. In particular, the root node is never visited in postorder.

Siblings are always visited left-to-right.

Implementations can have side-effects (e.g. modify the parse tree). Removing the current node is legal, but removing or reordering nodes above the current node may cause nodes to be visited twice or not at all.

Specified by:

visit in interface NodeTraversal.Callback

Parameters:

t - The current traversal.

n - The current node.

parent - The parent of the current node.