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/*
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Norris Boyd
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

// API class

package com.google.javascript.rhino;

/**
 * This is interface defines a protocol for the reporting of
 * errors during JavaScript translation or execution.
 *
 */

public interface ErrorReporter {

    /**
     * Report a warning.
     *
     * The implementing class may choose to ignore the warning
     * if it desires.
     *
     * @param message a String describing the warning
     * @param sourceName a String describing the JavaScript source
     * where the warning occurred; typically a filename or URL
     * @param line the line number associated with the warning
     * @param lineOffset the offset into lineSource where problem was detected
     */
    void warning(String message, String sourceName, int line, int lineOffset);

    /**
     * Report an error.
     *
     * The implementing class is free to throw an exception if
     * it desires.
     *
     * If execution has not yet begun, the JavaScript engine is
     * free to find additional errors rather than terminating
     * the translation. It will not execute a script that had
     * errors, however.
     *
     * @param message a String describing the error
     * @param sourceName a String describing the JavaScript source
     * where the error occurred; typically a filename or URL
     * @param line the line number associated with the error
     * @param lineOffset the offset into lineSource where problem was detected
     */
    void error(String message, String sourceName, int line, int lineOffset);

  static final ErrorReporter NULL_INSTANCE =
      new ErrorReporter() {
        @Override
        public void warning(String message, String sourceName, int line, int lineOffset) {}

        @Override
        public void error(String message, String sourceName, int line, int lineOffset) {}
      };

  static final ErrorReporter ALWAYS_THROWS_INSTANCE =
      new ErrorReporter() {
        @Override
        public void warning(String message, String sourceName, int line, int lineOffset) {
          throw new IllegalStateException(message);
        }

        @Override
        public void error(String message, String sourceName, int line, int lineOffset) {
          throw new IllegalStateException(message);
        }
      };
}