/*
** Luxor - XML User Interface Language (XUL) Toolkit
** Copyright (c) 2001, 2002 by Gerald Bauer
**
** This program is free software.
**
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE.
**
*/

package luxor.util;

import java.io.*;
import java.util.*;
import org.jdom.*;
import luxor.core.*;

public class HtmlOutputter
{
   /**
    *  convenience method for outputContent; returns String directly
    */
   public static String getContent( List content )
   {
      try
      {
         StringWriter buf = new StringWriter();
         outputContent( content, buf );
         return buf.toString();
      }
      catch( IOException ioex )
      {
         Xul.error( "failed to get element's content: " + ioex.toString() );
         return "";
      }
   }

   /**
    *  print out an element's content only, not including its tag and
    *  attributes.
    */
   public static void outputContent( List content, Writer out )
          throws IOException
   {
      // Loop over content/children

      Iterator it = content.iterator();
      while( it.hasNext() )
      {
         Object obj = it.next();
         // See if text, an element, a PI or a comment
         if( obj instanceof Comment )
            continue;
         // ignore comments
         else if( obj instanceof String )
            out.write( ( String ) obj );
         else if( obj instanceof Element )
            outputElement( ( Element ) obj, out );
         else if( obj instanceof EntityRef )
            continue;
         // not supported yet
         else if( obj instanceof ProcessingInstruction )
            continue;
         // not supported yet
         else if( obj instanceof CDATA )
            continue;
         // not supported yet
      }
      // Unsupported types are *not* printed, nor should they exist
   }

   private static void outputAttributes( List attributes, Writer out )
          throws IOException
   {
      Iterator it = attributes.iterator();
      while( it.hasNext() )
      {
         Attribute attribute = ( Attribute ) it.next();

         out.write( " " );
         out.write( attribute.getName() );
         out.write( "=" );

         // fix: add support for entities (aka escapce sequences)
         out.write( "\"" );
         out.write( attribute.getValue() );
         out.write( "\"" );
      }
   }

   private static void outputElement( Element element, Writer out )
          throws IOException
   {
      String name = element.getName();

      out.write( "<" + name );

      outputAttributes( element.getAttributes(), out );

      out.write( ">" );

      outputContent( element.getContent(), out );

      // convert xhtml to html
      //  - we don't want a closing tag for hr, br, etc.
      if( name.equals( "hr" )
             || name.equals( "br" ) )
         return;

      out.write( "</" + name + ">" );
   }

}