htmldebugdumper.java

HTML解释器JAVA源码

/*
 * HtmlDumper.java -- Dumps an HTML document tree. 
 * Copyright (C) 1999 Quiotix Corporation.  
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as 
 * published by the Free Software Foundation.  
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License (http://www.gnu.org/copyleft/gpl.txt)
 * for more details.
 */

package com.quiotix.html.parser;

import java.io.*;

/** 
 * Simple HtmlVisitor which dumps out the document to the specified 
 * output stream. 
 *
 * @author Brian Goetz, Quiotix
 */

public class HtmlDebugDumper extends HtmlVisitor {
  protected PrintWriter out;

  public HtmlDebugDumper(OutputStream os) { out = new PrintWriter(os); }

  public void finish()                    { out.flush();               }

  public void visit(HtmlDocument.Tag t)        { 
    out.print("Tag(" + t + ")");   
  }
  public void visit(HtmlDocument.EndTag t)     { 
    out.print("Tag(" + t + ")");   
  }
  public void visit(HtmlDocument.Comment c)    { 
    out.print("Comment(" + c + ")");   
  }
  public void visit(HtmlDocument.Text t)       { 
    out.print(t);   
  }
  public void visit(HtmlDocument.Newline n)    { 
    out.println("-NL-");  
  }
  public void visit(HtmlDocument.Annotation a) { 
    out.print(a);   
  }
  public void visit(HtmlDocument.TagBlock bl)  { 
    out.print("<BLOCK>");
    visit(bl.startTag);
    visit(bl.body);
    visit(bl.endTag);
    out.print("</BLOCK>");
  }

  public static void main(String[] args) throws ParseException {
    HtmlParser parser = new HtmlParser(System.in);
    HtmlDocument doc = parser.HtmlDocument();
    doc.accept(new HtmlDebugDumper(System.out));
  }
}