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/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.runtime.atn;

import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.misc.MurmurHash;

/**
 * Implements the {@code skip} lexer action by calling {@link Lexer#skip}.
 *
 * 

The {@code skip} command does not have any parameters, so this action is * implemented as a singleton instance exposed by {@link #INSTANCE}.

* * @author Sam Harwell * @since 4.2 */ public final class LexerSkipAction implements LexerAction { /** * Provides a singleton instance of this parameterless lexer action. */ public static final LexerSkipAction INSTANCE = new LexerSkipAction(); /** * Constructs the singleton instance of the lexer {@code skip} command. */ private LexerSkipAction() { } /** * {@inheritDoc} * @return This method returns {@link LexerActionType#SKIP}. */ @Override public LexerActionType getActionType() { return LexerActionType.SKIP; } /** * {@inheritDoc} * @return This method returns {@code false}. */ @Override public boolean isPositionDependent() { return false; } /** * {@inheritDoc} * *

This action is implemented by calling {@link Lexer#skip}.

*/ @Override public void execute(Lexer lexer) { lexer.skip(); } @Override public int hashCode() { int hash = MurmurHash.initialize(); hash = MurmurHash.update(hash, getActionType().ordinal()); return MurmurHash.finish(hash, 1); } @Override @SuppressWarnings("EqualsWhichDoesntCheckParameterClass") public boolean equals(Object obj) { return obj == this; } @Override public String toString() { return "skip"; } }




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