InternalParser.java

package me.tomassetti.turin.parser;

import me.tomassetti.parser.antlr.TurinLexer;
import me.tomassetti.parser.antlr.TurinParser;
import org.antlr.v4.runtime.*;

import java.io.IOException;
import java.io.InputStream;

public class InternalParser {

    public TurinParser.TurinFileContext produceParseTree(InputStream inputStream) throws IOException {
        CharStream charStream = new ANTLRInputStream(inputStream);
        TurinLexer l = new TurinLexer(charStream);
        TurinParser p = new TurinParser(new CommonTokenStream(l));
        p.addErrorListener(new BaseErrorListener() {
            @Override
            public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
                throw new IllegalStateException("failed to parse at  L " + line + ", C " + charPositionInLine + " due to " + msg, e);
            }
        });
        TurinParser.TurinFileContext turinFileContext = p.turinFile();
        if (l._mode != 0) {
            throw new RuntimeException("Lexical error");
        }
        return turinFileContext;
    }

}