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https://github.com/renbaoshuo/S2OJ.git
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71 lines
2.1 KiB
PHP
71 lines
2.1 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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*/
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class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
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{
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/**
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* @param string $string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($string, $config, $context)
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{
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$string = trim($string);
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// early abort: '' and '0' (strings that convert to false) are invalid
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if (!$string) {
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return false;
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}
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$tokens = $this->split($string, $config, $context);
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$tokens = $this->filter($tokens, $config, $context);
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if (empty($tokens)) {
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return false;
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}
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return implode(' ', $tokens);
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}
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/**
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* Splits a space separated list of tokens into its constituent parts.
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* @param string $string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return array
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*/
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protected function split($string, $config, $context)
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{
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// OPTIMIZABLE!
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// do the preg_match, capture all subpatterns for reformulation
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// we don't support U+00A1 and up codepoints or
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// escaping because I don't know how to do that with regexps
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// and plus it would complicate optimization efforts (you never
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// see that anyway).
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$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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return $matches[1];
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}
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/**
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* Template method for removing certain tokens based on arbitrary criteria.
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* @note If we wanted to be really functional, we'd do an array_filter
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* with a callback. But... we're not.
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* @param array $tokens
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return array
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*/
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protected function filter($tokens, $config, $context)
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{
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return $tokens;
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}
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}
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// vim: et sw=4 sts=4
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