mylexer.java

来自「Javacc 一个用来生成代码的脚本语言」· Java 代码 · 共 53 行

/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */



/**
 * A subclass of CalcInputTokenManager so that we can do better error reporting
 * via the GUI object.
 */
class MyLexer extends CalcInputParserTokenManager {

   /**
    * We redefined the lexical error reporting function so that it beeps
    * and displays a message thru the GUI.
    */
   protected void LexicalError() {
     CalcGUI.Error("ERROR (click 0)");
     ReInit(gui.getCollector(), OPERAND);
     result = 0.0;
   }

   public MyLexer(CalcGUI guiObj)
   {
      super(guiObj.getCollector(), OPERAND);
      gui = guiObj;
   }
}