com.oracle.js.parser.ir

Class Expression

java.lang.Object

com.oracle.js.parser.ir.Node

com.oracle.js.parser.ir.Expression

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

BinaryNode, BlockExpression, ClassNode, ErrorNode, ExpressionList, FunctionNode, IdentNode, JoinPredecessorExpression, LiteralNode, ObjectNode, OptionalExpression, ParameterNode, TemplateLiteralNode, TernaryNode, UnaryNode

public abstract class Expression
extends Node

Common superclass for all expression nodes. Expression nodes can have an associated symbol as well as a type.

Field Summary

Fields inherited from class com.oracle.js.parser.ir.Node

finish, start

Method Summary

Modifier and Type	Method and Description
int	getFinish() Get the finish position for this node in the source string
int	getFinishWithoutParens()
int	getStart() Get start position for node
int	getStartWithoutParens()
boolean	isAlwaysFalse() Returns true if the runtime value of this expression is always false when converted to boolean as per ECMAScript ToBoolean conversion.
boolean	isAlwaysTrue() Returns true if the runtime value of this expression is always true when converted to boolean as per ECMAScript ToBoolean conversion.
boolean	isParenthesized() Determines whether this expression is enclosed in parenthesis.
boolean	isSelfModifying() Is this a self modifying assignment?
void	makeParenthesized(int parenStart, int parenFinish) Marks this expression as enclosed in parenthesis.

Methods inherited from class com.oracle.js.parser.ir.Node

accept, accept, clone, equals, getSourceOrder, getToken, hashCode, isAssignment, isLoop, isTokenType, tokenType, toString, toString, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

isSelfModifying

public boolean isSelfModifying()

Is this a self modifying assignment?

Returns:

true if self modifying, e.g. a++, or a*= 17

isAlwaysFalse

public boolean isAlwaysFalse()

Returns true if the runtime value of this expression is always false when converted to boolean as per ECMAScript ToBoolean conversion. Used in control flow calculations.

Returns:

true if this expression's runtime value converted to boolean is always false.

isAlwaysTrue

public boolean isAlwaysTrue()

Returns true if the runtime value of this expression is always true when converted to boolean as per ECMAScript ToBoolean conversion. Used in control flow calculations.

Returns:

true if this expression's runtime value converted to boolean is always true.

isParenthesized

public final boolean isParenthesized()

Determines whether this expression is enclosed in parenthesis.

Returns:

true if this expression is enclosed in parenthesis, returns false otherwise.

makeParenthesized

public final void makeParenthesized(int parenStart,
                                    int parenFinish)

Marks this expression as enclosed in parenthesis.

getStart

public int getStart()

Description copied from class: Node

Get start position for node

Overrides:

getStart in class Node

Returns:

start position

getStartWithoutParens

public final int getStartWithoutParens()

getFinish

public int getFinish()

Description copied from class: Node

Get the finish position for this node in the source string

Overrides:

getFinish in class Node

Returns:

finish

getFinishWithoutParens

public final int getFinishWithoutParens()