$cache
$cache : \CodeIgniter\Cache\CacheInterface
Instance of the current Cache Instance
Class Cell
A simple class that can call any other class that can be loaded, and echo out it's result. Intended for displaying small blocks of content within views that can be managed by other libraries and not require they are loaded within controller.
Used with the helper function, it's use will look like:
viewCell('\Some\Class::method', 'limit=5 sort=asc', 60, 'cache-name');
Parameters are matched up with the callback method's arguments of the same name:
class Class {
function method($limit, $sort)
}
Alternatively, the params will be passed into the callback method as a simple array if matching params are not found.
class Class {
function method(array $params=null)
}
$cache : \CodeIgniter\Cache\CacheInterface
Instance of the current Cache Instance
__construct(\CodeIgniter\Cache\CacheInterface $cache)
Cell constructor.
\CodeIgniter\Cache\CacheInterface | $cache |
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
* Copyright (c) 2019 CodeIgniter Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2019 CodeIgniter Foundation
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 4.0.0
* @filesource
*/
namespace CodeIgniter\View;
use CodeIgniter\Cache\CacheInterface;
use CodeIgniter\View\Exceptions\ViewException;
use ReflectionMethod;
/**
* Class Cell
*
* A simple class that can call any other class that can be loaded,
* and echo out it's result. Intended for displaying small blocks of
* content within views that can be managed by other libraries and
* not require they are loaded within controller.
*
* Used with the helper function, it's use will look like:
*
* viewCell('\Some\Class::method', 'limit=5 sort=asc', 60, 'cache-name');
*
* Parameters are matched up with the callback method's arguments of the same name:
*
* class Class {
* function method($limit, $sort)
* }
*
* Alternatively, the params will be passed into the callback method as a simple array
* if matching params are not found.
*
* class Class {
* function method(array $params=null)
* }
*
* @package CodeIgniter\View
*/
class Cell
{
/**
* Instance of the current Cache Instance
*
* @var CacheInterface
*/
protected $cache;
//--------------------------------------------------------------------
/**
* Cell constructor.
*
* @param \CodeIgniter\Cache\CacheInterface $cache
*/
public function __construct(CacheInterface $cache)
{
$this->cache = $cache;
}
//--------------------------------------------------------------------
/**
* Render a cell, returning its body as a string.
*
* @param string $library
* @param null $params
* @param integer $ttl
* @param string|null $cacheName
*
* @return string
* @throws \ReflectionException
*/
public function render(string $library, $params = null, int $ttl = 0, string $cacheName = null): string
{
list($class, $method) = $this->determineClass($library);
// Is it cached?
$cacheName = ! empty($cacheName) ? $cacheName : $class . $method . md5(serialize($params));
if (! empty($this->cache) && $output = $this->cache->get($cacheName))
{
return $output;
}
// Not cached - so grab it...
$instance = new $class();
if (! method_exists($instance, $method))
{
throw ViewException::forInvalidCellMethod($class, $method);
}
// Try to match up the parameter list we were provided
// with the parameter name in the callback method.
$paramArray = $this->prepareParams($params);
$refMethod = new ReflectionMethod($instance, $method);
$paramCount = $refMethod->getNumberOfParameters();
$refParams = $refMethod->getParameters();
if ($paramCount === 0)
{
if (! empty($paramArray))
{
throw ViewException::forMissingCellParameters($class, $method);
}
$output = $instance->{$method}();
}
elseif (($paramCount === 1) && (
( ! array_key_exists($refParams[0]->name, $paramArray)) ||
(array_key_exists($refParams[0]->name, $paramArray) && count($paramArray) !== 1) )
)
{
$output = $instance->{$method}($paramArray);
}
else
{
$fireArgs = [];
$method_params = [];
foreach ($refParams as $arg)
{
$method_params[$arg->name] = true;
if (array_key_exists($arg->name, $paramArray))
{
$fireArgs[$arg->name] = $paramArray[$arg->name];
}
}
foreach ($paramArray as $key => $val)
{
if (! isset($method_params[$key]))
{
throw ViewException::forInvalidCellParameter($key);
}
}
$output = $instance->$method(...array_values($fireArgs));
}
// Can we cache it?
if (! empty($this->cache) && $ttl !== 0)
{
$this->cache->save($cacheName, $output, $ttl);
}
return $output;
}
//--------------------------------------------------------------------
/**
* Parses the params attribute. If an array, returns untouched.
* If a string, it should be in the format "key1=value key2=value".
* It will be split and returned as an array.
*
* @param $params
*
* @return array|null
*/
public function prepareParams($params)
{
if (empty($params) || ( ! is_string($params) && ! is_array($params)))
{
return [];
}
if (is_string($params))
{
$new_params = [];
$separator = ' ';
if (strpos($params, ',') !== false)
{
$separator = ',';
}
$params = explode($separator, $params);
unset($separator);
foreach ($params as $p)
{
if (! empty($p))
{
list($key, $val) = explode('=', $p);
$new_params[trim($key)] = trim($val, ', ');
}
}
$params = $new_params;
unset($new_params);
}
if (is_array($params) && empty($params))
{
return [];
}
return $params;
}
//--------------------------------------------------------------------
/**
* Given the library string, attempts to determine the class and method
* to call.
*
* @param string $library
*
* @return array
*/
protected function determineClass(string $library): array
{
// We don't want to actually call static methods
// by default, so convert any double colons.
$library = str_replace('::', ':', $library);
list($class, $method) = explode(':', $library);
if (empty($class))
{
throw ViewException::forNoCellClass();
}
if (! class_exists($class, true))
{
throw ViewException::forInvalidCellClass($class);
}
if (empty($method))
{
$method = 'index';
}
return [
$class,
$method,
];
}
//--------------------------------------------------------------------
}