com.oracle.js.parser.ir

Class JoinPredecessorExpression

java.lang.Object

com.oracle.js.parser.ir.Node

com.oracle.js.parser.ir.Expression

com.oracle.js.parser.ir.JoinPredecessorExpression

All Implemented Interfaces:

Cloneable

public class JoinPredecessorExpression
extends Expression

A wrapper for an expression that is in a position to be a join predecessor.

Field Summary

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

finish, start

Constructor Summary

Constructors

Constructor and Description
JoinPredecessorExpression() A no-arg constructor does not wrap any expression on its own, but can be used as a place to contain a local variable conversion in a place where an expression can otherwise stand.
JoinPredecessorExpression(Expression expression) A constructor for wrapping an expression and making it a join predecessor.

Method Summary

Modifier and Type	Method and Description
Node	accept(NodeVisitor<? extends LexicalContext> visitor) Provides a means to navigate the IR.
<R> R	accept(TranslatorNodeVisitor<? extends LexicalContext,R> visitor) Provides a means to navigate the IR.
Expression	getExpression() Returns the underlying expression.
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.
JoinPredecessorExpression	setExpression(Expression expression) Sets the underlying expression.
void	toString(StringBuilder sb, boolean printType) Print logic that decides whether to show the optimistic type or not - for example it should not be printed after just parse, when it hasn't been computed, or has been set to a trivially provable value

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

getFinish, getFinishWithoutParens, getStart, getStartWithoutParens, isParenthesized, isSelfModifying, makeParenthesized

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinPredecessorExpression

public JoinPredecessorExpression()

A no-arg constructor does not wrap any expression on its own, but can be used as a place to contain a local variable conversion in a place where an expression can otherwise stand.

JoinPredecessorExpression

public JoinPredecessorExpression(Expression expression)

A constructor for wrapping an expression and making it a join predecessor. Typically used on true and false subexpressions of the ternary node as well as on the operands of short-circuiting logical expressions && and ||.

Parameters:

expression - the expression to wrap

Method Detail

isAlwaysFalse

public boolean isAlwaysFalse()

Description copied from class: Expression

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.

Overrides:

isAlwaysFalse in class Expression

Returns:

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

isAlwaysTrue

public boolean isAlwaysTrue()

Description copied from class: Expression

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.

Overrides:

isAlwaysTrue in class Expression

Returns:

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

getExpression

public Expression getExpression()

Returns the underlying expression.

Returns:

the underlying expression.

setExpression

public JoinPredecessorExpression setExpression(Expression expression)

Sets the underlying expression.

Parameters:

expression - the new underlying expression

Returns:

this or modified join predecessor expression object.

accept

public Node accept(NodeVisitor<? extends LexicalContext> visitor)

Description copied from class: Node

Provides a means to navigate the IR.

Specified by:

accept in class Node

Parameters:

visitor - Node visitor.

Returns:

node the node or its replacement after visitation, null if no further visitations are required

accept

public <R> R accept(TranslatorNodeVisitor<? extends LexicalContext,R> visitor)

Description copied from class: Node

Provides a means to navigate the IR.

Specified by:

accept in class Node

Parameters:

visitor - Node visitor.

Returns:

node the node or its replacement after visitation, null if no further visitations are required

toString

public void toString(StringBuilder sb,
                     boolean printType)

Description copied from class: Node

Print logic that decides whether to show the optimistic type or not - for example it should not be printed after just parse, when it hasn't been computed, or has been set to a trivially provable value

Specified by:

toString in class Node

Parameters:

sb - string builder

printType - print type?