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The ANTLR 4 Runtime
There is a newer version: 4.13.2
/*
 * [The "BSD license"]
 *  Copyright (c) 2012 Terence Parr
 *  Copyright (c) 2012 Sam Harwell
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.antlr.v4.runtime;

import org.antlr.v4.runtime.atn.ATN;
import org.antlr.v4.runtime.atn.ATNType;
import org.antlr.v4.runtime.atn.LexerATNSimulator;
import org.antlr.v4.runtime.atn.PredictionContextCache;
import org.antlr.v4.runtime.dfa.DFA;

import java.util.Collection;

public class LexerInterpreter extends Lexer {
	protected final String grammarFileName;
	protected final ATN atn;

	@Deprecated
	protected final String[] tokenNames;
	protected final String[] ruleNames;
	protected final String[] modeNames;


	private final Vocabulary vocabulary;

	protected final DFA[] _decisionToDFA;
	protected final PredictionContextCache _sharedContextCache =
		new PredictionContextCache();

	@Deprecated
	public LexerInterpreter(String grammarFileName, Collection tokenNames, Collection ruleNames, Collection modeNames, ATN atn, CharStream input) {
		this(grammarFileName, VocabularyImpl.fromTokenNames(tokenNames.toArray(new String[tokenNames.size()])), ruleNames, modeNames, atn, input);
	}

	public LexerInterpreter(String grammarFileName, Vocabulary vocabulary, Collection ruleNames, Collection modeNames, ATN atn, CharStream input) {
		super(input);

		if (atn.grammarType != ATNType.LEXER) {
			throw new IllegalArgumentException("The ATN must be a lexer ATN.");
		}

		this.grammarFileName = grammarFileName;
		this.atn = atn;
		this.tokenNames = new String[atn.maxTokenType];
		for (int i = 0; i < tokenNames.length; i++) {
			tokenNames[i] = vocabulary.getDisplayName(i);
		}

		this.ruleNames = ruleNames.toArray(new String[ruleNames.size()]);
		this.modeNames = modeNames.toArray(new String[modeNames.size()]);
		this.vocabulary = vocabulary;

		this._decisionToDFA = new DFA[atn.getNumberOfDecisions()];
		for (int i = 0; i < _decisionToDFA.length; i++) {
			_decisionToDFA[i] = new DFA(atn.getDecisionState(i), i);
		}
		this._interp = new LexerATNSimulator(this,atn,_decisionToDFA,_sharedContextCache);
	}

	@Override
	public ATN getATN() {
		return atn;
	}

	@Override
	public String getGrammarFileName() {
		return grammarFileName;
	}

	@Override
	@Deprecated
	public String[] getTokenNames() {
		return tokenNames;
	}

	@Override
	public String[] getRuleNames() {
		return ruleNames;
	}

	@Override
	public String[] getModeNames() {
		return modeNames;
	}

	@Override
	public Vocabulary getVocabulary() {
		if (vocabulary != null) {
			return vocabulary;
		}

		return super.getVocabulary();
	}
}