org.jruby.ast

Class NilNode

java.lang.Object

org.jruby.ast.Node

org.jruby.ast.NilNode

All Implemented Interfaces:

IEqlNode, INameNode, ISourcePositionHolder

Direct Known Subclasses:

NilImplicitNode

public class NilNode
extends Node
implements INameNode, IEqlNode

represents 'nil'

Constructor Summary

Constructors

Constructor and Description
NilNode(ISourcePosition position)

Method Summary

Methods

Modifier and Type	Method and Description
Object	accept(NodeVisitor iVisitor) Accept for the visitor pattern.
List<Node>	childNodes()
RubyString	definition(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock)
boolean	eql(IRubyObject otherValue, ThreadContext context, Ruby runtime, IRubyObject self, Block aBlock)
String	getName() Name of nil node.
NodeType	getNodeType()
IRubyObject	interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock)
boolean	isNil() Whether the node evaluates to nil and has no side effects.

Methods inherited from class org.jruby.ast.Node

assign, createList, createList, createList, createList, getNodeName, getPosition, setPosition, toString

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 Object accept(NodeVisitor iVisitor)

Accept for the visitor pattern.

Specified by:

accept in class Node

Parameters:

iVisitor - the visitor

getName

public String getName()

Name of nil node.

Specified by:

getName in interface INameNode

childNodes

public List<Node> childNodes()

Specified by:

childNodes in class Node

interpret

public IRubyObject interpret(Ruby runtime,
                    ThreadContext context,
                    IRubyObject self,
                    Block aBlock)

Overrides:

interpret in class Node

definition

public RubyString definition(Ruby runtime,
                    ThreadContext context,
                    IRubyObject self,
                    Block aBlock)

Overrides:

definition in class Node

eql

public boolean eql(IRubyObject otherValue,
          ThreadContext context,
          Ruby runtime,
          IRubyObject self,
          Block aBlock)

Specified by:

eql in interface IEqlNode

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