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https://github.com/renbaoshuo/S2OJ.git
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96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
71 lines
2.1 KiB
PHP
71 lines
2.1 KiB
PHP
<?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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