htmlpurifier/library/HTMLPurifier/AttrDef/CSS/TextDecoration.php

<?php

/**
 * Validates the value for the CSS property text-decoration
 * @note This class could be generalized into a version that acts sort of
 *       like Enum except you can compound the allowed values.
 */
class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
{
    
    public function validate($string, $config, $context) {
        
        static $allowed_values = array(
            'line-through' => true,
            'overline' => true,
            'underline' => true,
        );
        
        $string = strtolower($this->parseCDATA($string));
        
        if ($string === 'none') return $string;
        
        $parts = explode(' ', $string);
        $final = '';
        foreach ($parts as $part) {
            if (isset($allowed_values[$part])) {
                $final .= $part . ' ';
            }
        }
        $final = rtrim($final);
        if ($final === '') return false;
        return $final;
        
    }
    
}