org.eclipse.viatra2.loaders.vtcl_lpgparser/src/org/eclipse/viatra2/lpgparser/loader/ExplanationGenerator.java

/**
* Copyright (c) 2008 - 2010 OptXware Research and Development LLC.
* 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
*
* Contributors:
*   Daniel Varro - Initial API and implementation
*/
/**
 * 
 */
package org.eclipse.viatra2.lpgparser.loader;

import org.apache.commons.lang.math.NumberUtils;
import org.eclipse.viatra2.lpgparser.VTCLParser;

/**
 * Explanation generator class for the VTCL parser.
 * @author Zoltan Ujhelyi
 *
 */
public class ExplanationGenerator {
	
	VTCLParser parser;
	
	/**
	 * Initializes an explanation generator using a VTCL parser object.
	 * @param parser
	 */
	public ExplanationGenerator(VTCLParser parser) {
		this.parser = parser;
	}

	/**
	 * Calculates an explanation about the parser error.
	 * @param tokenText
	 * @param leftToken
	 * @param rightToken
	 * @return the generated explanation
	 */
	public String calculateErrorExplanation(String tokenText, int leftToken, int rightToken) {
		if (tokenText.contentEquals("\"VariableRefAST\"") || tokenText.contentEquals("\"VariableDefAST\"")) {
			return calculateExplanationVariableRef(leftToken);
		}
		return "";
	}
	
	private String calculateExplanationVariableRef(int leftToken) {
		String description = parser.getIToken(leftToken).toString();
		if (NumberUtils.isNumber(description)) {
			return VTCLMessages.ExplanationCode_INVALIDNUMBER;
		}
		if (!description.matches("[A-Z][?]*")) {
			return VTCLMessages.ExplanationCode_REFSTARTCAPITAL;
		}
		return "";
	}
}