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htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Nmtokens.php
Edward Z. Yang 522c8ed7c2 [3.1.0] The bulk of autoload support added
- Add FSTools:globr()
- require_once removed from all files
- HTMLPurifier.autoload.php added to register autoload handler
- Removed redundant chdir in maintenance script
- Modified standalone to use HTMLPurifier.includes.php for including stuff
- Added maintenance script remove-require-once.php which we used once and should never use again

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1516 48356398-32a2-884e-a903-53898d9a118a
2008-01-27 01:54:41 +00:00

48 lines
1.6 KiB
PHP

<?php
/**
* Validates contents based on NMTOKENS attribute type.
* @note The only current use for this is the class attribute in HTML
* @note Could have some functionality factored out into Nmtoken class
* @warning We cannot assume this class will be used only for 'class'
* attributes. Not sure how to hook in magic behavior, then.
*/
class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
{
public function validate($string, $config, $context) {
$string = trim($string);
// early abort: '' and '0' (strings that convert to false) are invalid
if (!$string) return false;
// OPTIMIZABLE!
// do the preg_match, capture all subpatterns for reformulation
// we don't support U+00A1 and up codepoints or
// escaping because I don't know how to do that with regexps
// and plus it would complicate optimization efforts (you never
// see that anyway).
$matches = array();
$pattern = '/(?:(?<=\s)|\A)'. // look behind for space or string start
'((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)'.
'(?:(?=\s)|\z)/'; // look ahead for space or string end
preg_match_all($pattern, $string, $matches);
if (empty($matches[1])) return false;
// reconstruct string
$new_string = '';
foreach ($matches[1] as $token) {
$new_string .= $token . ' ';
}
$new_string = rtrim($new_string);
return $new_string;
}
}