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49 lines
1.5 KiB
PHP
49 lines
1.5 KiB
PHP
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<?php
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/**
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* Validates contents based on NMTOKENS attribute type.
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* @note The only current use for this is the class attribute in HTML
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* @note Could have some functionality factored out into Nmtoken class
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* @warning We cannot assume this class will be used only for 'class'
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* attributes. Not sure how to hook in magic behavior, then.
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*/
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class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
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{
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public function validate($string, $config, $context) {
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$string = trim($string);
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// early abort: '' and '0' (strings that convert to false) are invalid
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if (!$string) return false;
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// OPTIMIZABLE!
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// do the preg_match, capture all subpatterns for reformulation
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// we don't support U+00A1 and up codepoints or
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// escaping because I don't know how to do that with regexps
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// and plus it would complicate optimization efforts (you never
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// see that anyway).
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$matches = array();
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$pattern = '/(?:(?<=\s)|\A)'. // look behind for space or string start
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'((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)'.
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'(?:(?=\s)|\z)/'; // look ahead for space or string end
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preg_match_all($pattern, $string, $matches);
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if (empty($matches[1])) return false;
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// reconstruct string
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$new_string = '';
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foreach ($matches[1] as $token) {
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$new_string .= $token . ' ';
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}
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$new_string = rtrim($new_string);
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return $new_string;
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}
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}
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// vim: et sw=4 sts=4
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