/*

  * Copyright 1999,2004 The Apache Software Foundation.

  * 

  * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.feedparser.locate;

 import java.util.HashMap;

 /**

  *

  * Given a string of HTML content, parse out anchors and fire events with all

  * the data when they are found.

  *

  * @author <a href="mailto:burton@openprivacy.org">Kevin A. Burton</a>

  */

 public class AnchorParser {

     public static void parse( String content,

                               AnchorParserListener listener )

         throws AnchorParserException {

         //FIXME: we do NOT obey base right now and this is a BIG problem!

         parseAnchors( content, listener );

     }

     /**

      * Get links from the given html with included titles and other metainfo.

      *

      * @deprecated use HTParser

      * 

      */

     public static void parseAnchors( String content,

                                      AnchorParserListener listener )

         throws AnchorParserException {

         int index = 0;

         int begin = 0;

         int end = 0;

         //FIXME: what if there are HTML comments here?  We would parse links

         //within comments which isn't what we want.

         // FIXME: how do we pass back the content of the href?

         //

         // <a href=''> this is the content </a>

         //

         // which would pass a string "this is the content"

         //Matcher m = pattern.matcher( content );

         while ( (begin = content.indexOf( "<a", index )) != -1 ) {

             index = begin;

             end = content.indexOf( "</a>", index );

             if ( end == -1 )

                 break;

             index = end + 1;

             String match =  content.substring( begin, end );

             HashMap map = DiscoveryLocator.getAttributes( match );

             //String resource = EntityDecoder.decode( m.group( 1 ) );

             //FIXME: we SHOULD be using this but its not working right now.

             String resource = (String)map.get( "href" );

             if ( resource == null || resource.equals( "" ) ) {

                 continue;

             }

             String title = (String)map.get( "title" );

             if ( title != null )

                 title = EntityDecoder.decode( title );

             String rel = (String)map.get( "rel" );

             if ( ! listener.onAnchor( resource, rel, title ) )

                 return;

         } 

     }

     public static void main( String[] args ) throws Exception {

         AnchorParserListener listener = new AnchorParserListener() {

                 public boolean onAnchor( String href, String rel, String title ) {

                     System.out.println( "href: " + href );

                     System.out.println( "rel: " + rel );

                     System.out.println( "title: " + title );

                     return true;

                 }

                 public Object getResult() {

                     return null;

                 }

                 public void setContext( Object context ) {}

             };

         //FIXME: won't work with single quotes

         //FIXME: won't work with <a />

         //parse( "<a href=\"http://peerfear.org\" rel=\"linux\" title=\"linux\" >adf</a>", listener );

         //parse( "<a rel=\"linux\" href=\"http://peerfear.org\" title=\"linux\" >adf</a>", listener );

         //parse( "<a title=\"linux\" rel=\"linux\" href=\"http://peerfear.org\" >adf</a>", listener );

         //parse( "<a href='http://peerfear.org' rel='linux' title='linux' >adf</a>", listener );

         parse( "<a href='mailto:burton@rojo.com' rel='linux' title='linux' ><img src='' /></a>", listener );

     }

 }