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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\MVC\View;

defined('JPATH_PLATFORM') or die;

/**
 * Base class for a Joomla View
 *
 * Class holding methods for displaying presentation data.
 *
 * @since  2.5.5
 */
class HtmlView extends \JObject
{
	/**
	 * The active document object
	 *
	 * @var    \JDocument
	 * @since  3.0
	 */
	public $document;

	/**
	 * The name of the view
	 *
	 * @var    array
	 * @since  3.0
	 */
	protected $_name = null;

	/**
	 * Registered models
	 *
	 * @var    array
	 * @since  3.0
	 */
	protected $_models = array();

	/**
	 * The base path of the view
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_basePath = null;

	/**
	 * The default model
	 *
	 * @var	   string
	 * @since  3.0
	 */
	protected $_defaultModel = null;

	/**
	 * Layout name
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_layout = 'default';

	/**
	 * Layout extension
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_layoutExt = 'php';

	/**
	 * Layout template
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_layoutTemplate = '_';

	/**
	 * The set of search directories for resources (templates)
	 *
	 * @var    array
	 * @since  3.0
	 */
	protected $_path = array('template' => array(), 'helper' => array());

	/**
	 * The name of the default template source file.
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_template = null;

	/**
	 * The output of the template script.
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_output = null;

	/**
	 * Callback for escaping.
	 *
	 * @var    string
	 * @since  3.0
	 * @deprecated  3.0
	 */
	protected $_escape = 'htmlspecialchars';

	/**
	 * Charset to use in escaping mechanisms; defaults to urf8 (UTF-8)
	 *
	 * @var    string
	 * @since  3.0
	 */
	protected $_charset = 'UTF-8';

	/**
	 * Constructor
	 *
	 * @param   array  $config  A named configuration array for object construction.
	 *                          name: the name (optional) of the view (defaults to the view class name suffix).
	 *                          charset: the character set to use for display
	 *                          escape: the name (optional) of the function to use for escaping strings
	 *                          base_path: the parent path (optional) of the views directory (defaults to the component folder)
	 *                          template_plath: the path (optional) of the layout directory (defaults to base_path + /views/ + view name
	 *                          helper_path: the path (optional) of the helper files (defaults to base_path + /helpers/)
	 *                          layout: the layout (optional) to use to display the view
	 *
	 * @since   3.0
	 */
	public function __construct($config = array())
	{
		// Set the view name
		if (empty($this->_name))
		{
			if (array_key_exists('name', $config))
			{
				$this->_name = $config['name'];
			}
			else
			{
				$this->_name = $this->getName();
			}
		}

		// Set the charset (used by the variable escaping functions)
		if (array_key_exists('charset', $config))
		{
			\JLog::add('Setting a custom charset for escaping is deprecated. Override \JViewLegacy::escape() instead.', \JLog::WARNING, 'deprecated');
			$this->_charset = $config['charset'];
		}

		// User-defined escaping callback
		if (array_key_exists('escape', $config))
		{
			$this->setEscape($config['escape']);
		}

		// Set a base path for use by the view
		if (array_key_exists('base_path', $config))
		{
			$this->_basePath = $config['base_path'];
		}
		else
		{
			$this->_basePath = JPATH_COMPONENT;
		}

		// Set the default template search path
		if (array_key_exists('template_path', $config))
		{
			// User-defined dirs
			$this->_setPath('template', $config['template_path']);
		}
		elseif (is_dir($this->_basePath . '/view'))
		{
			$this->_setPath('template', $this->_basePath . '/view/' . $this->getName() . '/tmpl');
		}
		else
		{
			$this->_setPath('template', $this->_basePath . '/views/' . $this->getName() . '/tmpl');
		}

		// Set the default helper search path
		if (array_key_exists('helper_path', $config))
		{
			// User-defined dirs
			$this->_setPath('helper', $config['helper_path']);
		}
		else
		{
			$this->_setPath('helper', $this->_basePath . '/helpers');
		}

		// Set the layout
		if (array_key_exists('layout', $config))
		{
			$this->setLayout($config['layout']);
		}
		else
		{
			$this->setLayout('default');
		}

		$this->baseurl = \JUri::base(true);
	}

	/**
	 * Execute and display a template script.
	 *
	 * @param   string  $tpl  The name of the template file to parse; automatically searches through the template paths.
	 *
	 * @return  mixed  A string if successful, otherwise an Error object.
	 *
	 * @see     \JViewLegacy::loadTemplate()
	 * @since   3.0
	 */
	public function display($tpl = null)
	{
		$result = $this->loadTemplate($tpl);

		if ($result instanceof \Exception)
		{
			return $result;
		}

		echo $result;
	}

	/**
	 * Assigns variables to the view script via differing strategies.
	 *
	 * This method is overloaded; you can assign all the properties of
	 * an object, an associative array, or a single value by name.
	 *
	 * You are not allowed to set variables that begin with an underscore;
	 * these are either private properties for \JView or private variables
	 * within the template script itself.
	 *
	 * <code>
	 * $view = new \Joomla\CMS\View\HtmlView;
	 *
	 * // Assign directly
	 * $view->var1 = 'something';
	 * $view->var2 = 'else';
	 *
	 * // Assign by name and value
	 * $view->assign('var1', 'something');
	 * $view->assign('var2', 'else');
	 *
	 * // Assign by assoc-array
	 * $ary = array('var1' => 'something', 'var2' => 'else');
	 * $view->assign($obj);
	 *
	 * // Assign by object
	 * $obj = new \stdClass;
	 * $obj->var1 = 'something';
	 * $obj->var2 = 'else';
	 * $view->assign($obj);
	 *
	 * </code>
	 *
	 * @return  boolean  True on success, false on failure.
	 *
	 * @since   3.0
	 * @deprecated  3.0 Use native PHP syntax.
	 */
	public function assign()
	{
		\JLog::add(__METHOD__ . ' is deprecated. Use native PHP syntax.', \JLog::WARNING, 'deprecated');

		// Get the arguments; there may be 1 or 2.
		$arg0 = @func_get_arg(0);
		$arg1 = @func_get_arg(1);

		// Assign by object
		if (is_object($arg0))
		{
			// Assign public properties
			foreach (get_object_vars($arg0) as $key => $val)
			{
				if (strpos($key, '_') !== 0)
				{
					$this->$key = $val;
				}
			}

			return true;
		}

		// Assign by associative array
		if (is_array($arg0))
		{
			foreach ($arg0 as $key => $val)
			{
				if (strpos($key, '_') !== 0)
				{
					$this->$key = $val;
				}
			}

			return true;
		}

		// Assign by string name and mixed value.

		// We use array_key_exists() instead of isset() because isset()
		// fails if the value is set to null.
		if (is_string($arg0) && strpos($arg0, '_') !== 0 && func_num_args() > 1)
		{
			$this->$arg0 = $arg1;

			return true;
		}

		// $arg0 was not object, array, or string.
		return false;
	}

	/**
	 * Assign variable for the view (by reference).
	 *
	 * You are not allowed to set variables that begin with an underscore;
	 * these are either private properties for \JView or private variables
	 * within the template script itself.
	 *
	 * <code>
	 * $view = new \JView;
	 *
	 * // Assign by name and value
	 * $view->assignRef('var1', $ref);
	 *
	 * // Assign directly
	 * $view->var1 = &$ref;
	 * </code>
	 *
	 * @param   string  $key   The name for the reference in the view.
	 * @param   mixed   &$val  The referenced variable.
	 *
	 * @return  boolean  True on success, false on failure.
	 *
	 * @since   3.0
	 * @deprecated  3.0  Use native PHP syntax.
	 */
	public function assignRef($key, &$val)
	{
		\JLog::add(__METHOD__ . ' is deprecated. Use native PHP syntax.', \JLog::WARNING, 'deprecated');

		if (is_string($key) && strpos($key, '_') !== 0)
		{
			$this->$key = &$val;

			return true;
		}

		return false;
	}

	/**
	 * Escapes a value for output in a view script.
	 *
	 * If escaping mechanism is either htmlspecialchars or htmlentities, uses
	 * {@link $_encoding} setting.
	 *
	 * @param   mixed  $var  The output to escape.
	 *
	 * @return  mixed  The escaped value.
	 *
	 * @since   3.0
	 */
	public function escape($var)
	{
		if (in_array($this->_escape, array('htmlspecialchars', 'htmlentities')))
		{
			return call_user_func($this->_escape, $var, ENT_COMPAT, $this->_charset);
		}

		return call_user_func($this->_escape, $var);
	}

	/**
	 * Method to get data from a registered model or a property of the view
	 *
	 * @param   string  $property  The name of the method to call on the model or the property to get
	 * @param   string  $default   The name of the model to reference or the default value [optional]
	 *
	 * @return  mixed  The return value of the method
	 *
	 * @since   3.0
	 */
	public function get($property, $default = null)
	{
		// If $model is null we use the default model
		if ($default === null)
		{
			$model = $this->_defaultModel;
		}
		else
		{
			$model = strtolower($default);
		}

		// First check to make sure the model requested exists
		if (isset($this->_models[$model]))
		{
			// Model exists, let's build the method name
			$method = 'get' . ucfirst($property);

			// Does the method exist?
			if (method_exists($this->_models[$model], $method))
			{
				// The method exists, let's call it and return what we get
				$result = $this->_models[$model]->$method();

				return $result;
			}
		}

		// Degrade to \JObject::get
		$result = parent::get($property, $default);

		return $result;
	}

	/**
	 * Method to get the model object
	 *
	 * @param   string  $name  The name of the model (optional)
	 *
	 * @return  mixed  \JModelLegacy object
	 *
	 * @since   3.0
	 */
	public function getModel($name = null)
	{
		if ($name === null)
		{
			$name = $this->_defaultModel;
		}

		return $this->_models[strtolower($name)];
	}

	/**
	 * Get the layout.
	 *
	 * @return  string  The layout name
	 *
	 * @since   3.0
	 */
	public function getLayout()
	{
		return $this->_layout;
	}

	/**
	 * Get the layout template.
	 *
	 * @return  string  The layout template name
	 *
	 * @since   3.0
	 */
	public function getLayoutTemplate()
	{
		return $this->_layoutTemplate;
	}

	/**
	 * Method to get the view name
	 *
	 * The model name by default parsed using the classname, or it can be set
	 * by passing a $config['name'] in the class constructor
	 *
	 * @return  string  The name of the model
	 *
	 * @since   3.0
	 * @throws  \Exception
	 */
	public function getName()
	{
		if (empty($this->_name))
		{
			$classname = get_class($this);
			$viewpos = strpos($classname, 'View');

			if ($viewpos === false)
			{
				throw new \Exception(\JText::_('JLIB_APPLICATION_ERROR_VIEW_GET_NAME'), 500);
			}

			$this->_name = strtolower(substr($classname, $viewpos + 4));
		}

		return $this->_name;
	}

	/**
	 * Method to add a model to the view.  We support a multiple model single
	 * view system by which models are referenced by classname.  A caveat to the
	 * classname referencing is that any classname prepended by \JModel will be
	 * referenced by the name without \JModel, eg. \JModelCategory is just
	 * Category.
	 *
	 * @param   \JModelLegacy  $model    The model to add to the view.
	 * @param   boolean        $default  Is this the default model?
	 *
	 * @return  \JModelLegacy  The added model.
	 *
	 * @since   3.0
	 */
	public function setModel($model, $default = false)
	{
		$name = strtolower($model->getName());
		$this->_models[$name] = $model;

		if ($default)
		{
			$this->_defaultModel = $name;
		}

		return $model;
	}

	/**
	 * Sets the layout name to use
	 *
	 * @param   string  $layout  The layout name or a string in format <template>:<layout file>
	 *
	 * @return  string  Previous value.
	 *
	 * @since   3.0
	 */
	public function setLayout($layout)
	{
		$previous = $this->_layout;

		if (strpos($layout, ':') === false)
		{
			$this->_layout = $layout;
		}
		else
		{
			// Convert parameter to array based on :
			$temp = explode(':', $layout);
			$this->_layout = $temp[1];

			// Set layout template
			$this->_layoutTemplate = $temp[0];
		}

		return $previous;
	}

	/**
	 * Allows a different extension for the layout files to be used
	 *
	 * @param   string  $value  The extension.
	 *
	 * @return  string  Previous value
	 *
	 * @since   3.0
	 */
	public function setLayoutExt($value)
	{
		$previous = $this->_layoutExt;

		if ($value = preg_replace('#[^A-Za-z0-9]#', '', trim($value)))
		{
			$this->_layoutExt = $value;
		}

		return $previous;
	}

	/**
	 * Sets the _escape() callback.
	 *
	 * @param   mixed  $spec  The callback for _escape() to use.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 * @deprecated  3.0  Override \JViewLegacy::escape() instead.
	 */
	public function setEscape($spec)
	{
		\JLog::add(__METHOD__ . ' is deprecated. Override \JViewLegacy::escape() instead.', \JLog::WARNING, 'deprecated');

		$this->_escape = $spec;
	}

	/**
	 * Adds to the stack of view script paths in LIFO order.
	 *
	 * @param   mixed  $path  A directory path or an array of paths.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 */
	public function addTemplatePath($path)
	{
		$this->_addPath('template', $path);
	}

	/**
	 * Adds to the stack of helper script paths in LIFO order.
	 *
	 * @param   mixed  $path  A directory path or an array of paths.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 */
	public function addHelperPath($path)
	{
		$this->_addPath('helper', $path);
	}

	/**
	 * Load a template file -- first look in the templates folder for an override
	 *
	 * @param   string  $tpl  The name of the template source file; automatically searches the template paths and compiles as needed.
	 *
	 * @return  string  The output of the the template script.
	 *
	 * @since   3.0
	 * @throws  \Exception
	 */
	public function loadTemplate($tpl = null)
	{
		// Clear prior output
		$this->_output = null;

		$template = \JFactory::getApplication()->getTemplate();
		$layout = $this->getLayout();
		$layoutTemplate = $this->getLayoutTemplate();

		// Create the template file name based on the layout
		$file = isset($tpl) ? $layout . '_' . $tpl : $layout;

		// Clean the file name
		$file = preg_replace('/[^A-Z0-9_\.-]/i', '', $file);
		$tpl = isset($tpl) ? preg_replace('/[^A-Z0-9_\.-]/i', '', $tpl) : $tpl;

		// Load the language file for the template
		$lang = \JFactory::getLanguage();
		$lang->load('tpl_' . $template, JPATH_BASE, null, false, true)
			|| $lang->load('tpl_' . $template, JPATH_THEMES . "/$template", null, false, true);

		// Change the template folder if alternative layout is in different template
		if (isset($layoutTemplate) && $layoutTemplate !== '_' && $layoutTemplate != $template)
		{
			$this->_path['template'] = str_replace($template, $layoutTemplate, $this->_path['template']);
		}

		// Load the template script
		jimport('joomla.filesystem.path');
		$filetofind = $this->_createFileName('template', array('name' => $file));
		$this->_template = \JPath::find($this->_path['template'], $filetofind);

		// If alternate layout can't be found, fall back to default layout
		if ($this->_template == false)
		{
			$filetofind = $this->_createFileName('', array('name' => 'default' . (isset($tpl) ? '_' . $tpl : $tpl)));
			$this->_template = \JPath::find($this->_path['template'], $filetofind);
		}

		if ($this->_template != false)
		{
			// Unset so as not to introduce into template scope
			unset($tpl, $file);

			// Never allow a 'this' property
			if (isset($this->this))
			{
				unset($this->this);
			}

			// Start capturing output into a buffer
			ob_start();

			// Include the requested template filename in the local scope
			// (this will execute the view logic).
			include $this->_template;

			// Done with the requested template; get the buffer and
			// clear it.
			$this->_output = ob_get_contents();
			ob_end_clean();

			return $this->_output;
		}
		else
		{
			throw new \Exception(\JText::sprintf('JLIB_APPLICATION_ERROR_LAYOUTFILE_NOT_FOUND', $file), 500);
		}
	}

	/**
	 * Load a helper file
	 *
	 * @param   string  $hlp  The name of the helper source file automatically searches the helper paths and compiles as needed.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 */
	public function loadHelper($hlp = null)
	{
		// Clean the file name
		$file = preg_replace('/[^A-Z0-9_\.-]/i', '', $hlp);

		// Load the template script
		jimport('joomla.filesystem.path');
		$helper = \JPath::find($this->_path['helper'], $this->_createFileName('helper', array('name' => $file)));

		if ($helper != false)
		{
			// Include the requested template filename in the local scope
			include_once $helper;
		}
	}

	/**
	 * Sets an entire array of search paths for templates or resources.
	 *
	 * @param   string  $type  The type of path to set, typically 'template'.
	 * @param   mixed   $path  The new search path, or an array of search paths.  If null or false, resets to the current directory only.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 */
	protected function _setPath($type, $path)
	{
		$component = \JApplicationHelper::getComponentName();
		$app = \JFactory::getApplication();

		// Clear out the prior search dirs
		$this->_path[$type] = array();

		// Actually add the user-specified directories
		$this->_addPath($type, $path);

		// Always add the fallback directories as last resort
		switch (strtolower($type))
		{
			case 'template':
				// Set the alternative template search dir
				if (isset($app))
				{
					$component = preg_replace('/[^A-Z0-9_\.-]/i', '', $component);
					$fallback = JPATH_THEMES . '/' . $app->getTemplate() . '/html/' . $component . '/' . $this->getName();
					$this->_addPath('template', $fallback);
				}
				break;
		}
	}

	/**
	 * Adds to the search path for templates and resources.
	 *
	 * @param   string  $type  The type of path to add.
	 * @param   mixed   $path  The directory or stream, or an array of either, to search.
	 *
	 * @return  void
	 *
	 * @since   3.0
	 */
	protected function _addPath($type, $path)
	{
		jimport('joomla.filesystem.path');

		// Loop through the path directories
		foreach ((array) $path as $dir)
		{
			// Clean up the path
			$dir = \JPath::clean($dir);

			// Add trailing separators as needed
			if (substr($dir, -1) != DIRECTORY_SEPARATOR)
			{
				// Directory
				$dir .= DIRECTORY_SEPARATOR;
			}

			// Add to the top of the search dirs
			array_unshift($this->_path[$type], $dir);
		}
	}

	/**
	 * Create the filename for a resource
	 *
	 * @param   string  $type   The resource type to create the filename for
	 * @param   array   $parts  An associative array of filename information
	 *
	 * @return  string  The filename
	 *
	 * @since   3.0
	 */
	protected function _createFileName($type, $parts = array())
	{
		switch ($type)
		{
			case 'template':
				$filename = strtolower($parts['name']) . '.' . $this->_layoutExt;
				break;

			default:
				$filename = strtolower($parts['name']) . '.php';
				break;
		}

		return $filename;
	}

	/**
	 * Returns the form object
	 *
	 * @return  mixed  A \JForm object on success, false on failure
	 *
	 * @since   3.2
	 */
	public function getForm()
	{
		if (!is_object($this->form))
		{
			$this->form = $this->get('Form');
		}

		return $this->form;
	}

	/**
	 * Sets the document title according to Global Configuration options
	 *
	 * @param   string  $title  The page title
	 *
	 * @return  void
	 *
	 * @since   3.6
	 */
	public function setDocumentTitle($title)
	{
		$app = \JFactory::getApplication();

		// Check for empty title and add site name if param is set
		if (empty($title))
		{
			$title = $app->get('sitename');
		}
		elseif ($app->get('sitename_pagetitles', 0) == 1)
		{
			$title = \JText::sprintf('JPAGETITLE', $app->get('sitename'), $title);
		}
		elseif ($app->get('sitename_pagetitles', 0) == 2)
		{
			$title = \JText::sprintf('JPAGETITLE', $title, $app->get('sitename'));
		}

		$this->document->setTitle($title);
	}
}