<?php

namespace WPForms\Vendor;

/**
 * Abstract class representing Definition cache managers that implements
 * useful common methods and is a factory.
 * @todo Create a separate maintenance file advanced users can use to
 *       cache their custom HTMLDefinition, which can be loaded
 *       via a configuration directive
 * @todo Implement memcached
 */
abstract class HTMLPurifier_DefinitionCache
{
    /**
     * @type string
     */
    public $type;
    /**
     * @param string $type Type of definition objects this instance of the
     *      cache will handle.
     */
    public function __construct($type)
    {
        $this->type = $type;
    }
    /**
     * Generates a unique identifier for a particular configuration
     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
     * @return string
     */
    public function generateKey($config)
    {
        return $config->version . ',' . $config->getBatchSerial($this->type) . ',' . $config->get($this->type . '.DefinitionRev');
    }
    /**
     * Tests whether or not a key is old with respect to the configuration's
     * version and revision number.
     * @param string $key Key to test
     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config to test against
     * @return bool
     */
    public function isOld($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;
    }
    /**
     * Checks if a definition's type jives with the cache's type
     * @note Throws an error on failure
     * @param HTMLPurifier_Definition $def Definition object to check
     * @return bool true if good, false if not
     */
    public function checkDefType($def)
    {
        if ($def->type !== $this->type) {
            \trigger_error("Cannot use definition of type {$def->type} in cache for {$this->type}");
            return \false;
        }
        return \true;
    }
    /**
     * Adds a definition object to the cache
     * @param HTMLPurifier_Definition $def
     * @param HTMLPurifier_Config $config
     */
    public abstract function add($def, $config);
    /**
     * Unconditionally saves a definition object to the cache
     * @param HTMLPurifier_Definition $def
     * @param HTMLPurifier_Config $config
     */
    public abstract function set($def, $config);
    /**
     * Replace an object in the cache
     * @param HTMLPurifier_Definition $def
     * @param HTMLPurifier_Config $config
     */
    public abstract function replace($def, $config);
    /**
     * Retrieves a definition object from the cache
     * @param HTMLPurifier_Config $config
     */
    public abstract function get($config);
    /**
     * Removes a definition object to the cache
     * @param HTMLPurifier_Config $config
     */
    public abstract function remove($config);
    /**
     * Clears all objects from cache
     * @param HTMLPurifier_Config $config
     */
    public abstract function flush($config);
    /**
     * Clears all expired (older version or revision) objects from cache
     * @note Be careful implementing this method as flush. Flush must
     *       not interfere with other Definition types, and cleanup()
     *       should not be repeatedly called by userland code.
     * @param HTMLPurifier_Config $config
     */
    public abstract function cleanup($config);
}
// vim: et sw=4 sts=4
