htmlpurifier/library/HTMLPurifier/AttrDef/Enum.php

<?php

require_once 'HTMLPurifier/AttrDef.php';

// Enum = Enumerated
class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef
{
    
    var $valid_values   = array();
    var $case_sensitive = false; // values according to W3C spec
    
    function HTMLPurifier_AttrDef_Enum(
        $valid_values = array(), $case_sensitive = false) {
        
        $this->valid_values = array_flip($valid_values);
        $this->case_sensitive = $case_sensitive;
    }
    
    function validate($string, $config, &$context) {
        $string = trim($string);
        if (!$this->case_sensitive) {
            $string = ctype_lower($string) ? $string : strtolower($string);
        }
        $result = isset($this->valid_values[$string]);
        
        return $result ? $string : false;
    }
    
}

?>