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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Editors.codemirror
 *
 * @copyright   (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

// No direct access
defined('_JEXEC') or die;

use Joomla\CMS\Layout\LayoutHelper;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Event\Event;

/**
 * CodeMirror Editor Plugin.
 *
 * @since  1.6
 */
class PlgEditorCodemirror extends CMSPlugin
{
	/**
	 * Affects constructor behavior. If true, language files will be loaded automatically.
	 *
	 * @var    boolean
	 * @since  3.1.4
	 */
	protected $autoloadLanguage = true;

/**
	 * Mapping of syntax to CodeMirror modes.
	 *
	 * @var array
	 */
	protected $modeAlias = array();

/**
	 * Base path for editor assets.
	 *
	 * @var  string
	 *
	 * @since  4.0.0
	 */
	protected $basePath = 'media/vendor/codemirror/';

/**
	 * Base path for editor modes.
	 *
	 * @var  string
	 *
	 * @since  4.0.0
	 */
	protected $modePath = 'media/vendor/codemirror/mode/%N/%N';

/**
	 * Application object.
	 *
	 * @var    \Joomla\CMS\Application\CMSApplication
	 * @since  4.0.0
	 */
	protected $app;

/**
	 * Initialises the Editor.
	 *
	 * @return  void
	 */
	public function onInit()
	{
		static $done = false;

// Do this only once.
		if ($done)
		{
			return;
		}

$done = true;

// Most likely need this later
		$doc = $this->app->getDocument();

// Codemirror shall have its own group of plugins to modify and extend its behavior
		PluginHelper::importPlugin('editors_codemirror');

// At this point, params can be modified by a plugin before going to the layout renderer.
		$this->app->triggerEvent('onCodeMirrorBeforeInit', array(&$this->params, &$this->basePath, &$this->modePath));

$displayData = (object) array('params' => $this->params);
		$font = $this->params->get('fontFamily', '0');
		$fontInfo = $this->getFontInfo($font);

if (isset($fontInfo))
		{
			if (isset($fontInfo->url))
			{
				$doc->addStyleSheet($fontInfo->url);
			}

if (isset($fontInfo->css))
			{
				$displayData->fontFamily = $fontInfo->css . '!important';
			}
		}

// We need to do output buffering here because layouts may actually 'echo' things which we do not want.
		ob_start();
		LayoutHelper::render('editors.codemirror.styles', $displayData, __DIR__ . '/layouts');
		ob_end_clean();

$this->app->triggerEvent('onCodeMirrorAfterInit', array(&$this->params, &$this->basePath, &$this->modePath));
	}

/**
	 * Display the editor area.
	 *
	 * @param   string   $name     The control name.
	 * @param   string   $content  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   int      $col      The number of columns for the textarea.
	 * @param   int      $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    Not used.
	 * @param   object   $author   Not used.
	 * @param   array    $params   Associative array of editor parameters.
	 *
	 * @return  string  HTML
	 */
	public function onDisplay(
		$name, $content, $width, $height, $col, $row, $buttons = true, $id = null, $asset = null, $author = null, $params = array())
	{
		// True if a CodeMirror already has autofocus. Prevent multiple autofocuses.
		static $autofocused;

$id = empty($id) ? $name : $id;

// Must pass the field id to the buttons in this editor.
		$buttons = $this->displayButtons($id, $buttons, $asset, $author);

// Only add "px" to width and height if they are not given as a percentage.
		$width .= is_numeric($width) ? 'px' : '';
		$height .= is_numeric($height) ? 'px' : '';

// Options for the CodeMirror constructor.
		$options  = new stdClass;
		$keyMapUrl = '';

// Is field readonly?
		if (!empty($params['readonly']))
		{
			$options->readOnly = 'nocursor';
		}

// Should we focus on the editor on load?
		if (!$autofocused)
		{
			$options->autofocus = isset($params['autofocus']) ? (bool) $params['autofocus'] : false;
			$autofocused = $options->autofocus;
		}
		// Set autorefresh to true - fixes issue when editor is not loaded in a focused tab
		$options->autoRefresh = true;

$options->lineWrapping = (boolean) $this->params->get('lineWrapping', 1);

// Add styling to the active line.
		$options->styleActiveLine = (boolean) $this->params->get('activeLine', 1);

// Do we highlight selection matches?
		if ($this->params->get('selectionMatches', 1))
		{
			$options->highlightSelectionMatches = array(
					'showToken' => true,
					'annotateScrollbar' => true,
				);
		}

// Do we use line numbering?
		if ($options->lineNumbers = (boolean) $this->params->get('lineNumbers', 1))
		{
			$options->gutters[] = 'CodeMirror-linenumbers';
		}

// Do we use code folding?
		if ($options->foldGutter = (boolean) $this->params->get('codeFolding', 1))
		{
			$options->gutters[] = 'CodeMirror-foldgutter';
		}

// Do we use a marker gutter?
		if ($options->markerGutter = (boolean) $this->params->get('markerGutter', $this->params->get('marker-gutter', 1)))
		{
			$options->gutters[] = 'CodeMirror-markergutter';
		}

// Load the syntax mode.
		$syntax = !empty($params['syntax'])
			? $params['syntax']
			: $this->params->get('syntax', 'html');
		$options->mode = $this->modeAlias[$syntax] ?? $syntax;

// Load the theme if specified.
		if ($theme = $this->params->get('theme'))
		{
			$options->theme = $theme;

$this->app->getDocument()->getWebAssetManager()
				->registerAndUseStyle('codemirror.theme', $this->basePath . 'theme/' . $theme . '.css');
		}

// Special options for tagged modes (xml/html).
		if (in_array($options->mode, array('xml', 'html', 'php')))
		{
			// Autogenerate closing tags (html/xml only).
			$options->autoCloseTags = (boolean) $this->params->get('autoCloseTags', 1);

// Highlight the matching tag when the cursor is in a tag (html/xml only).
			$options->matchTags = (boolean) $this->params->get('matchTags', 1);
		}

// Special options for non-tagged modes.
		if (!in_array($options->mode, array('xml', 'html')))
		{
			// Autogenerate closing brackets.
			$options->autoCloseBrackets = (boolean) $this->params->get('autoCloseBrackets', 1);

// Highlight the matching bracket.
			$options->matchBrackets = (boolean) $this->params->get('matchBrackets', 1);
		}

$options->scrollbarStyle = $this->params->get('scrollbarStyle', 'native');

// KeyMap settings.
		$options->keyMap = $this->params->get('keyMap', false);

// Support for older settings.
		if ($options->keyMap === false)
		{
			$options->keyMap = $this->params->get('vimKeyBinding', 0) ? 'vim' : 'default';
		}

if ($options->keyMap !== 'default') {
			$keyMapUrl = $this->basePath . 'keymap/' . $options->keyMap . '.min.js';
		}

$options->keyMapUrl = $keyMapUrl;

$displayData = (object) array(
			'options'  => $options,
			'params'   => $this->params,
			'name'     => $name,
			'id'       => $id,
			'cols'     => $col,
			'rows'     => $row,
			'content'  => $content,
			'buttons'  => $buttons,
			'basePath' => $this->basePath,
			'modePath' => $this->modePath,
		);

// At this point, displayData can be modified by a plugin before going to the layout renderer.
		$results = $this->app->triggerEvent('onCodeMirrorBeforeDisplay', array(&$displayData));

$results[] = LayoutHelper::render('editors.codemirror.element', $displayData, __DIR__ . '/layouts');

foreach ($this->app->triggerEvent('onCodeMirrorAfterDisplay', array(&$displayData)) as $result)
		{
			$results[] = $result;
		}

return implode("\n", $results);
	}

/**
	 * Displays the editor buttons.
	 *
	 * @param   string  $name     Button name.
	 * @param   mixed   $buttons  [array with button objects | boolean true to display buttons]
	 * @param   mixed   $asset    Unused.
	 * @param   mixed   $author   Unused.
	 *
	 * @return  string|void
	 */
	protected function displayButtons($name, $buttons, $asset, $author)
	{
		if (is_array($buttons) || (is_bool($buttons) && $buttons))
		{
			$buttonsEvent = new Event(
				'getButtons',
				[
					'editor'  => $name,
					'buttons' => $buttons,
				]
			);

$buttonsResult = $this->getDispatcher()->dispatch('getButtons', $buttonsEvent);
			$buttons       = $buttonsResult['result'];

return LayoutHelper::render('joomla.editors.buttons', $buttons);
		}
	}

/**
	 * Gets font info from the json data file
	 *
	 * @param   string  $font  A key from the $fonts array.
	 *
	 * @return  object
	 */
	protected function getFontInfo($font)
	{
		static $fonts;

if (!$fonts)
		{
			$fonts = json_decode(file_get_contents(__DIR__ . '/fonts.json'), true);
		}

return isset($fonts[$font]) ? (object) $fonts[$font] : null;
	}
}