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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Editor;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Filter\InputFilter;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Event\AbstractEvent;
use Joomla\Event\DispatcherAwareInterface;
use Joomla\Event\DispatcherAwareTrait;
use Joomla\Event\DispatcherInterface;
use Joomla\Registry\Registry;

/**
 * Editor class to handle WYSIWYG editors
 *
 * @since  1.5
 */
class Editor implements DispatcherAwareInterface
{
	use DispatcherAwareTrait;

/**
	 * Editor Plugin object
	 *
	 * @var    object
	 * @since  1.5
	 */
	protected $_editor = null;

/**
	 * Editor Plugin name
	 *
	 * @var    string
	 * @since  1.5
	 */
	protected $_name = null;

/**
	 * Object asset
	 *
	 * @var    string
	 * @since  1.6
	 */
	protected $asset = null;

/**
	 * Object author
	 *
	 * @var    string
	 * @since  1.6
	 */
	protected $author = null;

/**
	 * Editor instances container.
	 *
	 * @var    Editor[]
	 * @since  2.5
	 */
	protected static $instances = array();

/**
	 * Constructor
	 *
	 * @param   string               $editor      The editor name
	 * @param   DispatcherInterface  $dispatcher  The event dispatcher we're going to use
	 */
	public function __construct($editor = 'none', DispatcherInterface $dispatcher = null)
	{
		$this->_name = $editor;

// Set the dispatcher
		if (!\is_object($dispatcher))
		{
			$dispatcher = Factory::getContainer()->get('dispatcher');
		}

$this->setDispatcher($dispatcher);

// Register the getButtons event
		$this->getDispatcher()->addListener(
			'getButtons',
			function (AbstractEvent $event) {
				$editor = $event->getArgument('editor', null);
				$buttons = $event->getArgument('buttons', null);
				$result = $event->getArgument('result', []);
				$newResult = $this->getButtons($editor, $buttons);
				$newResult = (array) $newResult;
				$event['result'] = array_merge($result, $newResult);
			}
		);
	}

/**
	 * Returns the global Editor object, only creating it
	 * if it doesn't already exist.
	 *
	 * @param   string  $editor  The editor to use.
	 *
	 * @return  Editor The Editor object.
	 *
	 * @since   1.5
	 */
	public static function getInstance($editor = 'none')
	{
		$signature = serialize($editor);

if (empty(self::$instances[$signature]))
		{
			self::$instances[$signature] = new static($editor);
		}

return self::$instances[$signature];
	}

/**
	 * Initialise the editor
	 *
	 * @return  void
	 *
	 * @since   1.5
	 */
	public function initialise()
	{
		// Check if editor is already loaded
		if ($this->_editor === null)
		{
			return;
		}

if (method_exists($this->_editor, 'onInit'))
		{
			\call_user_func(array($this->_editor, 'onInit'));
		}
	}

/**
	 * Display the editor area.
	 *
	 * @param   string   $name     The control name.
	 * @param   string   $html     The contents of the text area.
	 * @param   string   $width    The width of the text area (px or %).
	 * @param   string   $height   The height of the text area (px or %).
	 * @param   integer  $col      The number of columns for the textarea.
	 * @param   integer  $row      The number of rows for the textarea.
	 * @param   boolean  $buttons  True and the editor buttons will be displayed.
	 * @param   string   $id       An optional ID for the textarea (note: since 1.6). If not supplied the name is used.
	 * @param   string   $asset    The object asset
	 * @param   object   $author   The author.
	 * @param   array    $params   Associative array of editor parameters.
	 *
	 * @return  string
	 *
	 * @since   1.5
	 */
	public function display($name, $html, $width, $height, $col, $row, $buttons = true, $id = null, $asset = null, $author = null, $params = array())
	{
		$this->asset = $asset;
		$this->author = $author;
		$this->_loadEditor($params);

// Check whether editor is already loaded
		if ($this->_editor === null)
		{
			Factory::getApplication()->enqueueMessage(Text::_('JLIB_NO_EDITOR_PLUGIN_PUBLISHED'), 'danger');

return;
		}

// Backwards compatibility. Width and height should be passed without a semicolon from now on.
		// If editor plugins need a unit like "px" for CSS styling, they need to take care of that
		$width = str_replace(';', '', $width);
		$height = str_replace(';', '', $height);

$return = null;

$args['name'] = $name;
		$args['content'] = $html;
		$args['width'] = $width;
		$args['height'] = $height;
		$args['col'] = $col;
		$args['row'] = $row;
		$args['buttons'] = $buttons;
		$args['id'] = $id ?: $name;
		$args['asset'] = $asset;
		$args['author'] = $author;
		$args['params'] = $params;

return \call_user_func_array(array($this->_editor, 'onDisplay'), $args);
	}

/**
	 * Get the editor extended buttons (usually from plugins)
	 *
	 * @param   string  $editor   The name of the editor.
	 * @param   mixed   $buttons  Can be boolean or array, if boolean defines if the buttons are
	 *                            displayed, if array defines a list of buttons not to show.
	 *
	 * @return  array
	 *
	 * @since   1.5
	 */
	public function getButtons($editor, $buttons = true)
	{
		$result = array();

if (\is_bool($buttons) && !$buttons)
		{
			return $result;
		}

// Get plugins
		$plugins = PluginHelper::getPlugin('editors-xtd');

foreach ($plugins as $plugin)
		{
			if (\is_array($buttons) && \in_array($plugin->name, $buttons))
			{
				continue;
			}

PluginHelper::importPlugin('editors-xtd', $plugin->name, false);
			$className = 'PlgEditorsXtd' . $plugin->name;

if (!class_exists($className))
			{
				$className = 'PlgButton' . $plugin->name;
			}

if (class_exists($className))
			{
				$dispatcher = $this->getDispatcher();
				$plugin = new $className($dispatcher, (array) $plugin);
			}

// Try to authenticate
			if (!method_exists($plugin, 'onDisplay'))
			{
				continue;
			}

$button = $plugin->onDisplay($editor, $this->asset, $this->author);

if (empty($button))
			{
				continue;
			}

if (\is_array($button))
			{
				$result = array_merge($result, $button);
				continue;
			}

$result[] = $button;
		}

return $result;
	}

/**
	 * Load the editor
	 *
	 * @param   array  $config  Associative array of editor config parameters
	 *
	 * @return  mixed
	 *
	 * @since   1.5
	 */
	protected function _loadEditor($config = array())
	{
		// Check whether editor is already loaded
		if ($this->_editor !== null)
		{
			return false;
		}

// Build the path to the needed editor plugin
		$name = InputFilter::getInstance()->clean($this->_name, 'cmd');
		$path = JPATH_PLUGINS . '/editors/' . $name . '/' . $name . '.php';

if (!is_file($path))
		{
			Log::add(Text::_('JLIB_HTML_EDITOR_CANNOT_LOAD'), Log::WARNING, 'jerror');

return false;
		}

// Require plugin file
		require_once $path;

// Get the plugin
		$plugin = PluginHelper::getPlugin('editors', $this->_name);

// If no plugin is published we get an empty array and there not so much to do with it
		if (empty($plugin))
		{
			return false;
		}

$params = new Registry($plugin->params);
		$params->loadArray($config);
		$plugin->params = $params;

// Build editor plugin classname
		$name = 'PlgEditor' . $this->_name;

$dispatcher = $this->getDispatcher();

if ($this->_editor = new $name($dispatcher, (array) $plugin))
		{
			// Load plugin parameters
			$this->initialise();
			PluginHelper::importPlugin('editors-xtd');
		}
	}
}