dsl.utility.DSLFactory.java Source code

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Here is the source code for dsl.utility.DSLFactory.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 dsl.utility;

import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;

import dsl.lexparse.DSLLexer;
import dsl.lexparse.DSLLexerException;
import dsl.lexparse.DSLParser;
import dsl.lexparse.DSLParserException;

/**
 * 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 DSLFactory {
    /**
     * 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 DSLLexer makeLexer(ANTLRInputStream inputText) {
        final DSLLexer lexer = new DSLLexer(inputText);
        lexer.addErrorListener(new BaseErrorListener() {
            @Override
            public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line,
                    int charPositionInLine, String msg, RecognitionException e) {
                throw new DSLLexerException(msg, e);
            }
        });
        return lexer;
    }

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