dijkstra.utility.DijkstraFactory.java Source code

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Here is the source code for dijkstra.utility.DijkstraFactory.java

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/*******************************************************************************
 * Copyright (c) 2015 Gary F. Pollice
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Used in CS4533/CS544 at Worcester Polytechnic Institute
 *******************************************************************************/

package dijkstra.utility;

import org.antlr.v4.runtime.*;
import dijkstra.lexparse.*;

/**
 * The DijkstraFactory is responsible for constructing all, or parts of a Dijkstra
 * compiler. It is a standard Factory class.
 * 
 * @version Jan 26, 2015
 */
public class DijkstraFactory {
    /**
     * Create a Dijkstra lexer using the specified input stream containing the text
     * @param inputText the ANTLRInputStream that contains the program text
     * @return the Dijkstra lexer
     */
    static public DijkstraLexer makeLexer(ANTLRInputStream inputText) {
        final DijkstraLexer lexer = new DijkstraLexer(inputText);
        lexer.addErrorListener(new BaseErrorListener() {
            @Override
            public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line,
                    int charPositionInLine, String msg, RecognitionException e) {
                throw new DijkstraLexerException(msg, e);
            }
        });
        return lexer;
    }

    /**
     * @param inputText
     * @return
     */
    static public DijkstraParser makeParser(ANTLRInputStream inputText) {
        final DijkstraLexer lexer = makeLexer(inputText);
        final CommonTokenStream tokenStream = new CommonTokenStream(lexer);
        final DijkstraParser parser = new DijkstraParser(tokenStream);
        parser.addErrorListener(new BaseErrorListener() {
            @Override
            public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line,
                    int charPositionInLine, String msg, RecognitionException e) {
                throw new DijkstraParserException(msg, e);
            }
        });
        return parser;
    }
}