ParserBuilder.java

package edu.uva.softwarecons.util;

import edu.uva.softwarecons.grammar.QuestionnaireLexer;
import edu.uva.softwarecons.grammar.QuestionnaireParser;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;

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

/**
 * Falconlabs
 *
 * @author Santiago Carrillo
 *         Date: 2/19/14
 */
public class ParserBuilder
{


    private QuestionnaireParser parser;


    public ParseTree buildParseTree( String inputText )
    {
        return getParseTree( new ANTLRInputStream( inputText ) );
    }

    public ParseTree buildParseTree( InputStream inputStream )
        throws IOException
    {
        return getParseTree( new ANTLRInputStream( inputStream ) );
    }

    private ParseTree getParseTree( ANTLRInputStream input )
    {
        QuestionnaireLexer lexer = new QuestionnaireLexer( input );
        CommonTokenStream tokens = new CommonTokenStream( lexer );
        parser = new QuestionnaireParser( tokens );
        return parser.questionnaire();
    }


    public QuestionnaireParser getParser()
    {
        return parser;
    }
}