/*
 * Anarres C Preprocessor
 * Copyright (c) 2007-2008, Shevek
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */

package org.anarres.cpp;

import java.io.File;

/**
 * A handler for preprocessor events, primarily errors and warnings.
 *
 * If no PreprocessorListener is installed in a Preprocessor, all
 * error and warning events will throw an exception. Installing a
 * listener allows more intelligent handling of these events.
 */
public class PreprocessorListener {

	private int	errors;
	private int	warnings;

	public PreprocessorListener() {
		clear();
	}

	public void clear() {
		errors = 0;
		warnings = 0;
	}

	public int getErrors() {
		return errors;
	}

	public int getWarnings() {
		return warnings;
	}

	protected void print(String msg) {
		System.err.println(msg);
	}

	/**
	 * Handles a warning.
	 *
	 * The behaviour of this method is defined by the
	 * implementation. It may simply record the error message, or
	 * it may throw an exception.
	 */
	public void handleWarning(Source source, int line, int column,
					String msg)
						throws LexerException {
		warnings++;
		print(source.getName() + ":" + line + ":" + column +
				": warning: " + msg); 
	}

	/**
	 * Handles an error.
	 *
	 * The behaviour of this method is defined by the
	 * implementation. It may simply record the error message, or
	 * it may throw an exception.
	 */
	public void handleError(Source source, int line, int column,
					String msg)
						throws LexerException {
		errors++;
		print(source.getName() + ":" + line + ":" + column +
				": error: " + msg); 
	}

	public void handleSourceChange(Source source, String event) {
	}

}
