Package org.antlr.v4.runtime.atn

Class LexerChannelAction

java.lang.Object

org.antlr.v4.runtime.atn.LexerChannelAction

All Implemented Interfaces:

LexerAction

public final class LexerChannelAction
extends Object
implements LexerAction

Implements the channel lexer action by calling Lexer.setChannel(int) with the assigned channel.

Since:

4.2

Author:

Sam Harwell

Constructor Summary

Constructors

Constructor	Description
LexerChannelAction(int channel)	Constructs a new channel action with the specified channel value.

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	getChannel()	Gets the channel to use for the Token created by the lexer.
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

Constructor Detail

LexerChannelAction

public LexerChannelAction(int channel)

Constructs a new channel action with the specified channel value.

Parameters:

channel - The channel value to pass to Lexer.setChannel(int).

Method Detail

getChannel

public int getChannel()

Gets the channel to use for the Token created by the lexer.

Returns:

The channel to use for the Token created by the lexer.

getActionType

public LexerActionType getActionType()

Gets the serialization type of the lexer action.

Specified by:

getActionType in interface LexerAction

Returns:

This method returns LexerActionType.CHANNEL.

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.setChannel(int) with the value provided by getChannel().

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