Package org.antlr.v4.runtime.atn

Class LexerPopModeAction

java.lang.Object

org.antlr.v4.runtime.atn.LexerPopModeAction

All Implemented Interfaces:

LexerAction

public final class LexerPopModeAction
extends Object
implements LexerAction

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

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

Since:

4.2

Author:

Sam Harwell

Field Summary

Fields

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

Method Summary

Modifier and Type	Method	Description
boolean	equals(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.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final LexerPopModeAction INSTANCE

Provides a singleton instance of this parameterless lexer action.

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.POP_MODE.

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.popMode().

Specified by:

execute in interface LexerAction

Parameters:

lexer - The lexer instance.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object