assemblytokenizer.java

来自「tinyos最新版」· Java 代码 · 共 104 行

// $Id: AssemblyTokenizer.java,v 1.1 2004/03/22 02:15:48 scipio Exp $

/*									tab:4
 * "Copyright (c) 2000-2003 The Regents of the University  of California.  
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */
/* Authors:	Phil Levis <[e-mail]>
 * Date:        Oct 28 2003
 * Desc:        Assembly program tokenizer for script generated assembly.
 *
 */

/**
 * @author Phil Levis <[e-mail]>
 */


package net.tinyos.script;

import java.io.*;

/**
 * This class reads in an ASCII assembly program and tokenizes it into
 * individual instructions. If an instruction has an embedded operand,
 * that operand can be fetched with <tt>argument()</tt>.
 *
 */

public class AssemblyTokenizer {
    private StreamTokenizer tokenizer;
    
    public AssemblyTokenizer(Reader reader) throws IOException {
	tokenizer = new StreamTokenizer(reader);
	tokenizer.resetSyntax();
	tokenizer.eolIsSignificant(true);
	tokenizer.wordChars('A', 'Z');
	tokenizer.wordChars('a', 'z');
	tokenizer.wordChars('0', '9');
	tokenizer.wordChars(':', ':');
	tokenizer.whitespaceChars(0, 32); //Unreadable chars and whitespace
	tokenizer.whitespaceChars(127, 127); //DEL
    }

    public boolean hasMoreInstructions() throws IOException{
	int type = tokenizer.nextToken();
	if (type == StreamTokenizer.TT_EOF) {
	    return false;
	}
	else {
	    tokenizer.pushBack();
	    return true;
	}
    }

    public String nextLine() throws IOException {
	String instr = "";
	int type = tokenizer.nextToken();
	while (type != StreamTokenizer.TT_EOL &&
	       type != StreamTokenizer.TT_EOF) {
	  if (type == '#') {
	    while (type != StreamTokenizer.TT_EOL &&
		   type != StreamTokenizer.TT_EOF) {
	      type = tokenizer.nextToken();
	    }
	    continue;
	  }
	  if (type != StreamTokenizer.TT_WORD &&
	      type != StreamTokenizer.TT_EOL &&
	      type != StreamTokenizer.TT_EOF) {
	    throw new IOException("File parse failed on line " + tokenizer.lineno() + " type is " + ((type == StreamTokenizer.TT_EOF)? "EOF": ""+type));
	  }
	  instr += tokenizer.sval;
	  instr += " ";
	  type = tokenizer.nextToken();
	}
	instr = instr.trim();
	return instr;
    }
}