org.antlr.v4.runtime.atn

Class LexerSkipAction

java.lang.Object

org.antlr.v4.runtime.atn.LexerSkipAction

All Implemented Interfaces:

LexerAction

public final class LexerSkipAction
extends java.lang.Object
implements LexerAction

Implements the skip lexer action by calling Lexer.skip().

The skip command does not have any parameters, so this action is implemented as a singleton instance exposed by INSTANCE.

Since:

4.2

Field Summary

Fields

Modifier and Type	Field and Description
static LexerSkipAction	INSTANCE Provides a singleton instance of this parameterless lexer action.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	LexerSkipAction() Constructs the singleton instance of the lexer skip command.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj)
void	execute(Lexer lexer) Execute the lexer action in the context of the specified Lexer.
LexerActionType	getActionType() Gets the serialization type of the lexer action.
int	hashCode()
boolean	isPositionDependent() Gets whether the lexer action is position-dependent.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final LexerSkipAction INSTANCE

Provides a singleton instance of this parameterless lexer action.

Constructor Detail

LexerSkipAction

private LexerSkipAction()

Constructs the singleton instance of the lexer skip command.

Method Detail

getActionType

public LexerActionType getActionType()

Gets the serialization type of the lexer action.

Specified by:

getActionType in interface LexerAction

Returns:

This method returns LexerActionType.SKIP.

isPositionDependent

public boolean isPositionDependent()

Gets whether the lexer action is position-dependent. Position-dependent actions may have different semantics depending on the CharStream index at the time the action is executed.

Many lexer commands, including type, skip, and more, do not check the input index during their execution. Actions like this are position-independent, and may be stored more efficiently as part of the LexerATNConfig.lexerActionExecutor.

Specified by:

isPositionDependent in interface LexerAction

Returns:

This method returns false.

execute

public void execute(Lexer lexer)

Execute the lexer action in the context of the specified Lexer.

For position-dependent actions, the input stream must already be positioned correctly prior to calling this method.

This action is implemented by calling Lexer.skip().

Specified by:

execute in interface LexerAction

Parameters:

lexer - The lexer instance.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object