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With inspiration from other libraries
/*
* 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;
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.ArrayList;
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[] channelNames;
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, new ArrayList(), modeNames, atn, input);
}
@Deprecated
public LexerInterpreter(String grammarFileName, Vocabulary vocabulary, Collection ruleNames, Collection modeNames, ATN atn, CharStream input) {
this(grammarFileName, vocabulary, ruleNames, new ArrayList(), modeNames, atn, input);
}
public LexerInterpreter(String grammarFileName, Vocabulary vocabulary, Collection ruleNames, Collection channelNames, 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.channelNames = channelNames.toArray(new String[channelNames.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[] getChannelNames() {
return channelNames;
}
@Override
public String[] getModeNames() {
return modeNames;
}
@Override
public Vocabulary getVocabulary() {
if (vocabulary != null) {
return vocabulary;
}
return super.getVocabulary();
}
}