Source for file StyleSelector.interface.php

<?php
 
/**
 * A <code>StyleSelector</code> is an object that enables the user to create and
 * possibly parse CSS selectors.
 *  
 * For more information on CSS selectors, visit the following webpages:<br>
 * <a href = "http://www.blooberry.com/indexdot/css/index10.htm">Index DOT Css</a><br>
 * <a href = "http://www.w3.org/TR/CSS21/selector.html">CSS 2.1 Specification, Chapter 5: Selectors</a><br>
 * <br><br> A <code>StyleSelector</code> is a mandatory component of <code>StyleCollections</code>.
 * For (an extreme) example, consider the style collection represented by the CSS code:
 * <pre>
 * div.col1 > *#temp + td.hi#bye {
 *     margin: 20px;
 *     border: 1px solid #000;
 * }
 * </pre>
 * The string '<code>div.col1 > *#temp + td.hi#bye</code>' is the CSS selector.
 *
 * @package harmoni.gui.extensions
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: StyleSelector.interface.php,v 1.4 2005/02/07 21:38:17 adamfranco Exp $
 */
class StyleSelectorInterface {
 
    /**
     * Returns the CSS code corresponding to this <code>StyleSelector</code>.
     * @access public
     * @return string The CSS code corresponding to this <code>StyleSelector</code>.
     ***/
    function getCSS() {
        die ("Method <b>".__FUNCTION__."()</b> declared in interface<b> ".__CLASS__."</b> has not been overloaded in a child class.");
    }
    
    /**
     * Determines whether the implementation of this <code>StyleSelector</code>
     * allows <code>StyleCollections</code> to be applied to <code>Components</code>.
     * @access public
     * @return 
     ***/
    function canBeApplied() {
        die ("Method <b>".__FUNCTION__."()</b> declared in interface<b> ".__CLASS__."</b> has not been overloaded in a child class.");
    }
    
}
 
?>