4 * Validates the HTML attribute ID.
5 * @warning Even though this is the id processor, it
6 * will ignore the directive Attr:IDBlacklist, since it will only
7 * go according to the ID accumulator. Since the accumulator is
8 * automatically generated, it will have already absorbed the
9 * blacklist. If you're hacking around, make sure you use load()!
12 class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
15 // selector is NOT a valid thing to use for IDREFs, because IDREFs
16 // *must* target IDs that exist, whereas selector #ids do not.
19 * Determines whether or not we're validating an ID in a CSS
26 * @param bool $selector
28 public function __construct($selector = false)
30 $this->selector = $selector;
35 * @param HTMLPurifier_Config $config
36 * @param HTMLPurifier_Context $context
39 public function validate($id, $config, $context)
41 if (!$this->selector && !$config->get('Attr.EnableID')) {
45 $id = trim($id); // trim it first
51 $prefix = $config->get('Attr.IDPrefix');
53 $prefix .= $config->get('Attr.IDPrefixLocal');
54 // prevent re-appending the prefix
55 if (strpos($id, $prefix) !== 0) {
58 } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
60 '%Attr.IDPrefixLocal cannot be used unless ' .
61 '%Attr.IDPrefix is set',
66 if (!$this->selector) {
67 $id_accumulator =& $context->get('IDAccumulator');
68 if (isset($id_accumulator->ids[$id])) {
73 // we purposely avoid using regex, hopefully this is faster
75 if (ctype_alpha($id)) {
78 if (!ctype_alpha(@$id[0])) {
81 // primitive style of regexps, I suppose
86 $result = ($trim === '');
89 $regexp = $config->get('Attr.IDBlacklistRegexp');
90 if ($regexp && preg_match($regexp, $id)) {
94 if (!$this->selector && $result) {
95 $id_accumulator->add($id);
98 // if no change was made to the ID, return the result
99 // else, return the new id if stripping whitespace made it
100 // valid, or return false.
101 return $result ? $id : false;
105 // vim: et sw=4 sts=4