library/HTMLPurifier/DefinitionCache.php

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<?php

abstract class HTMLPurifier_DefinitionCache
{
    
    public $type;
    
    public function __construct($type) {
        $this->type = $type;
    }
    
    public function generateKey($config) {
        return $config->version . ',' . // possibly replace with function calls
               $config->getBatchSerial($this->type) . ',' .
               $config->get($this->type, 'DefinitionRev');
    }
    
    public function isOld($key, $config) {
        if (substr_count($key, ',') < 2) return true;
        list($version, $hash, $revision) = explode(',', $key, 3);
        $compare = version_compare($version, $config->version);
        // version mismatch, is always old
        if ($compare != 0) return true;
        // versions match, ids match, check revision number
        if (
            $hash == $config->getBatchSerial($this->type) &&
            $revision < $config->get($this->type, 'DefinitionRev')
        ) return true;
        return false;
    }
    
    public function checkDefType($def) {
        if ($def->type !== $this->type) {
            trigger_error("Cannot use definition of type {$def->type} in cache for {$this->type}");
            return false;
        }
        return true;
    }
    
    abstract public function add($def, $config);
    
    abstract public function set($def, $config);
    
    abstract public function replace($def, $config);
    
    abstract public function get($config);
    
    abstract public function remove($config);
    
    abstract public function flush($config);
    
    abstract public function cleanup($config);
    
}

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