AntlrGrammarTreeGenerator.java

/*
 * This file is part of GumTree.
 *
 * GumTree is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GumTree is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GumTree.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2011-2015 Jean-Rémy Falleri <jr.falleri@gmail.com>
 * Copyright 2011-2015 Floréal Morandat <florealm@gmail.com>
 */

package com.github.gumtreediff.gen.antlrantlr;

import com.github.gumtreediff.gen.antlr.AbstractAntlrTreeGenerator;
import com.github.gumtreediff.gen.Register;
import com.github.gumtreediff.gen.antlr.AbstractAntlrTreeGenerator;
import org.antlr.runtime.ANTLRReaderStream;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.TokenRewriteStream;
import org.antlr.runtime.tree.CommonTree;

import java.io.IOException;
import java.io.Reader;

@Register(id = "antlr-antlr", accept = "\\.[gG]$")
public class AntlrGrammarTreeGenerator extends AbstractAntlrTreeGenerator {

    @Override
    protected CommonTree getStartSymbol(Reader r) throws RecognitionException, IOException {
        ANTLRStringStream stream = new ANTLRReaderStream(r);
        ANTLRv3Lexer l = new ANTLRv3Lexer(stream);
        tokens = new TokenRewriteStream(l);
        ANTLRv3Parser p = new ANTLRv3Parser(tokens);
        return (CommonTree) p.grammarDef().getTree();
    }

    @Override
    protected final String[] getTokenNames() {
        return ANTLRv3Parser.tokenNames;
    }
}