content: /**
   *  Copyright (c) 2015-2016 Angelo ZERR.
   *  All rights reserved. This program and the accompanying materials
   *  are made available under the terms of the Eclipse Public License v1.0
   *  which accompanies this distribution, and is available at
   *  http://www.eclipse.org/legal/epl-v10.html
   *
   *  Contributors:
   *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
   */
  package ts.eclipse.jface.text;
  
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  
  import org.eclipse.jface.internal.text.html.BrowserInformationControl;
  import org.eclipse.swt.browser.LocationAdapter;
  import org.eclipse.swt.browser.LocationEvent;
  import org.eclipse.swt.browser.LocationListener;
  import org.eclipse.swt.program.Program;
  import org.eclipse.swt.widgets.Display;
  
  public class HoverLocationListener extends LocationAdapter {
  
  	public static final String HTTP_PROTOCOL = "http";
  	public static final String TERN_FILE_PROTOCOL = "tern-file:";
  	public static final String TERN_DEFINITION_PROTOCOL = "tern-definition:";
  	
  	private final BrowserInformationControl control;
  
  	public HoverLocationListener(BrowserInformationControl control) {
  		this.control = control;
  	}
  
  	@Override
  	public void changing(LocationEvent event) {
  
  		String loc = event.location;
  		if ("about:blank".equals(loc)) { //$NON-NLS-1$
  			/*
  			 * Using the Browser.setText API triggers a location change to
  			 * "about:blank". XXX: remove this code once
  			 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=130314 is fixed
  			 */
  			// input set with setText
  			handleTextSet();
  			return;
  		}
  
  		event.doit = false;
  
  		if (loc.startsWith(TERN_FILE_PROTOCOL)) { //$NON-NLS-1$
  			handleTernFileLink(loc);
  			return;
  		}
  
  		if (loc.startsWith(TERN_DEFINITION_PROTOCOL)) { //$NON-NLS-1$
  			handleTernDefinitionLink(loc);
  			return;
  		}
  		
  		if (loc.startsWith("about:")) { //$NON-NLS-1$
  			// Relative links should be handled via head > base tag.
  			// If no base is available, links just won't work.
  			return;
  		}
  
  		if (loc.startsWith(HTTP_PROTOCOL)) { //$NON-NLS-1$
  			try {
  				handleHttpLink(new URL(loc), event.display);
  				return;
  			} catch (MalformedURLException e) {
  
  			}
  		}
  
  	}
  
  	protected void handleTernFileLink(String loc) {
  		control.notifyDelayedInputChange(null);
  		control.dispose(); // FIXME: should have protocol to hide,
  							// rather than dispose
  	}
  
  	protected void handleTernDefinitionLink(String loc) {
  		control.notifyDelayedInputChange(null);
  		control.dispose(); // FIXME: should have protocol to hide,
  							// rather than dispose
  	}
  
  	private void handleTextSet() {
  
  	}
  
  	private void handleHttpLink(URL url, Display display) {
  		control.notifyDelayedInputChange(null);
  		control.dispose(); // FIXME: should have protocol to hide,
  							// rather than dispose
  
  		// Open attached Javadoc links
  		Program.launch(url.toExternalForm());
  	}
  
  	public static void addLinkListener(final BrowserInformationControl control) {
  		addLinkListener(control, new HoverLocationListener(control));
  	}
  
  	public static void addLinkListener(final BrowserInformationControl control,
  			LocationListener listener) {
  		control.addLocationListener(listener);
  	}
  
  }
  