org.jruby.ast

Class NilNode

java.lang.Object

org.jruby.ast.Node

org.jruby.ast.NilNode

All Implemented Interfaces:

SideEffectFree, ISourcePosition, ISourcePositionHolder, PositionAware

Direct Known Subclasses:

NilImplicitNode

public class NilNode
extends Node
implements SideEffectFree

represents 'nil'

Field Summary

Fields inherited from class org.jruby.ast.Node

containsVariableAssignment, newline

Constructor Summary

Constructors

Constructor and Description
NilNode(ISourcePosition position)

Method Summary

Modifier and Type	Method and Description
<T> T	accept(NodeVisitor<T> iVisitor) Accept for the visitor pattern.
java.util.List<Node>	childNodes()
NodeType	getNodeType()
boolean	isNil() Whether the node evaluates to nil and has no side effects.
boolean	needsDefinitionCheck() Check whether the given node is considered always "defined" or whether it has some form of definition check.

Methods inherited from class org.jruby.ast.Node

containsVariableAssignment, createList, createList, createList, createList, executesOnce, findFirstChild, getFile, getLine, getNodeName, getPosition, isNewline, setNewline, setPosition, toString, toString, toStringInternal

Methods inherited from class java.lang.Object

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

Constructor Detail

NilNode

public NilNode(ISourcePosition position)

Method Detail

getNodeType

public NodeType getNodeType()

Specified by:

getNodeType in class Node

Returns:

the nodeId

accept

public <T> T accept(NodeVisitor<T> iVisitor)

Accept for the visitor pattern.

Specified by:

accept in class Node

Parameters:

iVisitor - the visitor

childNodes

public java.util.List<Node> childNodes()

Specified by:

childNodes in class Node

isNil

public boolean isNil()

Description copied from class: Node

Whether the node evaluates to nil and has no side effects.

Overrides:

isNil in class Node

Returns:

true if nil, false otherwise

needsDefinitionCheck

public boolean needsDefinitionCheck()

Description copied from class: Node

Check whether the given node is considered always "defined" or whether it has some form of definition check.

Overrides:

needsDefinitionCheck in class Node

Returns:

Whether the type of node represents a possibly undefined construct