package com.insanityengine.ghia.util;
   
   import java.io.*;
   import java.net.*;
   
   import java.awt.event.*;
   
   import com.insanityengine.ghia.events.*;
   
  /***
   *
   * <P>
   * Takes html and pulls out href and anchors which is sends to listeners...
   * </P>
   *
   * @author BrianHammond
   *
   * $Header: /usr/local/cvsroot/ghia/src/java/com/insanityengine/ghia/util/Hreferee.java,v 1.3 2005/03/19 17:50:02 brian Exp $
   *
   */
  public class Hreferee extends ActionEventGenerator implements ActionListener {
  
  	public final static void main( String argv[] ) {
  		Hreferee href = new Hreferee();
  		href.addActionListener( href );
  
  		if ( 0 == argv.length ) {
  			href.ref( System.in );
  		} else {
  			for ( int i = 0 ; i < argv.length ; i++ ) href.ref( argv[ i ] );
  		}
  	}
  
  	public Hreferee() {
  	}
  
  	/***
  	 *
  	 * Chunk up a stream to produce events in the form of HREF&gt;ANCHOR
  	 *
  	 * @param href to parse
  	 *
  	 */
  	public void ref( String href ) {
  		try {
  			ref( new URL( href ) );
  		} catch ( Exception e ) {
  		}
  	}
  	
  	/***
  	 *
  	 * Chunk up a stream to produce events in the form of HREF&gt;ANCHOR
  	 *
  	 * @param url to parse
  	 *
  	 */
  	public void ref( URL url ) {
  		try {
  			setUrl( url );
  			ref( url.openStream() );
  		} catch ( Exception e ) {
  		}
  	}
  
  	/***
  	 *
  	 * Chunk up a stream to produce events in the form of HREF&gt;ANCHOR
  	 *
  	 * @param in stream
  	 *
  	 */
  	public void ref( InputStream in ) {
  		_init();
  		
  		char c;
  		byte [] bytes = new byte[ 1024 ];
  		int i;
  		int len = 0;
  		StringBuffer buf = new StringBuffer();
  		
  		try {
  			while ( -1 != ( len = in.read( bytes ) ) ) {
  				for ( i = 0 ; i < len ; ++i ) {
  					
  					c = ( char ) bytes[ i ];
  					if ( '\n' != c && '\r' != c ) {
  					
  						
  						if ( '<' == c ) {
  							ref( buf );
  							buf = new StringBuffer();
  						} 
  						buf.append( c );
  					}
  				}
  			}
  		} catch( Exception e ) {
  		}
 		ref( buf );
 	}
 
 	/***
 	 *
 	 * For ActionListener interface
 	 *
 	 * @param event to act on
 	 *
 	 */
 	public void actionPerformed( ActionEvent event ) {
 		System.out.println( event.getActionCommand() );
 	}
 
 	/***
 	  *
 	  * Set the value
 	  *
 	  * @param newValue to use
 	  *
 	  */
 	URL getUrl() { return url; }
 
 	/***
 	  *
 	  * Set the value
 	  *
 	  * @param newValue to use
 	  *
 	  */
 	void setUrl( URL newValue ) { url = newValue; }
 
 	/***
 	 *
 	 *
 	 */
 	private void ref( StringBuffer buf ) {
 		String lower = lowerIt( buf, 10 );
 
 		if ( !inScript ) {
 			inScript = ( 0 != lower.indexOf( "</script" ) );
 		} else {
 			inScript = ( 0 == lower.indexOf( "<script" ) );
 		}
 		
 		if ( !inScript && !inStyle ) refA( buf );
 	}
 
 	/***
 	 *
 	 *
 	 */
 	private void refA( StringBuffer buf ) {
 		if ( 0 == lowerIt( buf, 2 ).indexOf( "<a" ) ) {
 			fireActionPerformed( 
 				absUrl( href( buf ) ) + ">" + anchor( buf )
 			);
 		}
 	}
 
 	private String absUrl( String href ) {
 		if ( null != getUrl() ) {
 			try {
 				URL url = new URL( getUrl(), href );
 				href = url.toExternalForm();
 			} catch ( Exception e ) {
 			}
 		}
 		return href;
 	}
 
 	/***
 	 *
 	 *
 	 */
 	private static String href( StringBuffer buf ) {
 		
 		int hrefIdx = lowerIt( buf ).indexOf( "href" );
 		if ( -1 == hrefIdx ) return "";
 
 		String notIn = " =\"'//>";
 
 		for ( hrefIdx += 4 ; hrefIdx < buf.length() ; hrefIdx++ ) {
 			if ( -1 == notIn.indexOf( buf.charAt( hrefIdx ) ) ) {
 				break;	
 			}
 		}
 
 		int space = buf.substring( hrefIdx ).indexOf( " " );
 		int close = buf.indexOf( ">" );
 
 		if ( -1 != space && space < close ) close = space;
 		
 		if ( -1 == close ) {
 			close = buf.length();
 		} else {
 			for ( close-- ; close > hrefIdx ; close-- ) {
 				if ( -1 == notIn.indexOf( buf.charAt( close ) ) ) {
 					close ++;
 					break;
 				}
 			}
 		}
 		
 		return buf.substring( hrefIdx, close );
 	}
 
 	/***
 	 *
 	 *
 	 */
 	private static String anchor( StringBuffer buf ) {
 		return buf.substring( 1 + buf.indexOf( ">" ) );
 	}
 
 
 	/***
 	 *
 	 *
 	 */
 	private final static String lowerIt( StringBuffer buf, int n ) {
 		int idx = buf.length();
 		if ( idx > n ) idx = n;
 		return buf.substring( 0, idx ).toLowerCase();
 	}
 
 	/***
 	 *
 	 *
 	 */
 	private final static String lowerIt( StringBuffer buf ) {
 		return buf.toString().toLowerCase();
 	}
 	/***
 	 *
 	 *
 	 */
 	private void _init() {
 		inScript = inStyle = false;
 	}
 
 	////
 
 	private boolean inScript, inStyle;
 	private URL url = null;
 	
 };
 
 /***
  *
  * $Log: Hreferee.java,v $
  * Revision 1.3  2005/03/19 17:50:02  brian
  * repackaging
  *
  * Revision 1.2  2004/09/23 02:14:02  brian
  * relative to absolute url fix
  *
  * Revision 1.1  2004/09/23 01:03:45  brian
  * takes html and pulls out href and anchors which is sends to listeners...
  *
  *
  */