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<?php
/**
* @package Joomla.Platform
* @subpackage Application
*
* @copyright Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Base class for a Joomla View
*
* Class holding methods for displaying presentation data.
*
* @package Joomla.Platform
* @subpackage Application
* @since 11.1
*/
class JView extends JObject
{
/**
* The name of the view
*
* @var array
*/
protected $_name = null;
/**
* Registered models
*
* @var array
*/
protected $_models = array();
/**
* The base path of the view
*
* @var string
*/
protected $_basePath = null;
/**
* The default model
*
* @var string
*/
protected $_defaultModel = null;
/**
* Layout name
*
* @var string
*/
protected $_layout = 'default';
/**
* Layout extension
*
* @var string
*/
protected $_layoutExt = 'php';
/**
* Layout template
*
* @var string
*/
protected $_layoutTemplate = '_';
/**
* The set of search directories for resources (templates)
*
* @var array
*/
protected $_path = array('template' => array(), 'helper' => array());
/**
* The name of the default template source file.
*
* @var string
*/
protected $_template = null;
/**
* The output of the template script.
*
* @var string
*/
protected $_output = null;
/**
* Callback for escaping.
*
* @var string
*/
protected $_escape = 'htmlspecialchars';
/**
* Charset to use in escaping mechanisms; defaults to urf8 (UTF-8)
*
* @var string
*/
protected $_charset = 'UTF-8';
/**
* Constructor
*
* @param array $config A named configuration array for object construction.<br/>
* name: the name (optional) of the view (defaults to the view class name suffix).<br/>
* charset: the character set to use for display<br/>
* escape: the name (optional) of the function to use for escaping strings<br/>
* base_path: the parent path (optional) of the views directory (defaults to the component folder)<br/>
* template_plath: the path (optional) of the layout directory (defaults to base_path + /views/ + view name<br/>
* helper_path: the path (optional) of the helper files (defaults to base_path + /helpers/)<br/>
* layout: the layout (optional) to use to display the view<br/>
*
* @since 11.1
*/
public function __construct($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))
{
$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']);
}
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 $tpl The name of the template file to parse; automatically searches through the template paths.
*
* @return mixed A string if successful, otherwise a JError object.
*
* @see fetch()
* @since 11.1
*/
public function display($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 JView;
*
* // 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.
*/
public function assign()
{
// 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 => $val)
{
if (substr($key, 0, 1) != '_')
{
$this->$key = $val;
}
}
return true;
}
// Assign by associative array
if (is_array($arg0))
{
foreach ($arg0 as $key => $val)
{
if (substr($key, 0, 1) != '_')
{
$this->$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) && substr($arg0, 0, 1) != '_' && 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
* $view->ref = &$var1;
* </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 11.1
*/
public function assignRef($key, &$val)
{
if (is_string($key) && substr($key, 0, 1) != '_')
{
$this->$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 $var The output to escape.
*
* @return mixed The escaped value.
*
* @since 11.1
*/
public function escape($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 $default The name of the model to reference or the default value [optional]
*
* @return mixed The return value of the method
*
* @since 11.1
*/
public function get($property, $default = null)
{
// If $model is null we use the default model
if (is_null($default))
{
$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 $name The name of the model (optional)
*
* @return mixed JModel object
*
* @since 11.1
*/
public function getModel($name = null)
{
if ($name === null)
{
$name = $this->_defaultModel;
}
return $this->_models[strtolower($name)];
}
/**
* Get the layout.
*
* @return string The layout name
*/
public function getLayout()
{
return $this->_layout;
}
/**
* Get the layout template.
*
* @return string The layout template name
*/
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 $config['name'] in the class constructor
*
* @return string The name of the model
*
* @since 11.1
*/
public function getName()
{
if (empty($this->_name))
{
$r = null;
if (!preg_match('/View((view)*(.*(view)?.*))$/i', get_class($this), $r))
{
JError::raiseError(500, JText::_('JLIB_APPLICATION_ERROR_VIEW_GET_NAME'));
}
if (strpos($r[3], "view"))
{
JError::raiseWarning('SOME_ERROR_CODE', JText::_('JLIB_APPLICATION_ERROR_VIEW_GET_NAME_SUBSTRING'));
}
$this->_name = strtolower($r[3]);
}
return $this->_name;
}
/**
* Method to add a model to the view. We support a multiple model single
* view system by which models are referenced by classname. A caveat to the
* classname referencing is that any classname prepended by JModel will be
* referenced by the name without JModel, eg. JModelCategory is just
* Category.
*
* @param JModel &$model The model to add to the view.
* @param boolean $default Is this the default model?
*
* @return object The added model.
*
* @since 11.1
*/
public function setModel(&$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 $layout The layout name or a string in format <template>:<layout file>
*
* @return string Previous value.
*
* @since 11.1
*/
public function setLayout($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 $value The extension.
*
* @return string Previous value
*
* @since 11.1
*/
public function setLayoutExt($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 $spec The callback for _escape() to use.
*
* @return void
*
* @since 11.1
*/
public function setEscape($spec)
{
$this->_escape = $spec;
}
/**
* Adds to the stack of view script paths in LIFO order.
*
* @param mixed $path A directory path or an array of paths.
*
* @return void
*
* @since 11.1
*/
public function addTemplatePath($path)
{
$this->_addPath('template', $path);
}
/**
* Adds to the stack of helper script paths in LIFO order.
*
* @param mixed $path A directory path or an array of paths.
*
* @return void
*
* @since 11.1
*/
public function addHelperPath($path)
{
$this->_addPath('helper', $path);
}
/**
* Load a template file -- first look in the templates folder for an override
*
* @param string $tpl The name of the template source file; automatically searches the template paths and compiles as needed.
*
* @return string The output of the the template script.
*
* @since 11.1
*/
public function loadTemplate($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, false)
|| $lang->load('tpl_' . $template, JPATH_THEMES . "/$template", null, false, false)
|| $lang->load('tpl_' . $template, JPATH_BASE, $lang->getDefault(), false, false)
|| $lang->load('tpl_' . $template, JPATH_THEMES . "/$template", $lang->getDefault(), false, false);
// Change the template folder if alternative layout is in different template
if (isset($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($tpl);
unset($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
{
return JError::raiseError(500, JText::sprintf('JLIB_APPLICATION_ERROR_LAYOUTFILE_NOT_FOUND', $file));
}
}
/**
* Load a helper file
*
* @param string $hlp The name of the helper source file automatically searches the helper paths and compiles as needed.
*
* @return void
*
* @since 11.1
*/
public function loadHelper($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 $path The new search path, or an array of search paths. If null or false, resets to the current directory only.
*
* @return void
*
* @since 11.1
*/
protected function _setPath($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', Helix::frameworkPath().'/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 $path The directory or stream, or an array of either, to search.
*
* @return void
*
* @since 11.1
*/
protected function _addPath($type, $path)
{
// Just force to array
settype($path, 'array');
// Loop through the path directories
foreach ($path as $dir)
{
// no surrounding spaces allowed!
$dir = trim($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 $parts An associative array of filename information
*
* @return string The filename
*
* @since 11.1
*/
protected function _createFileName($type, $parts = array())
{
$filename = '';
switch ($type)
{
case 'template':
$filename = strtolower($parts['name']) . '.' . $this->_layoutExt;
break;
default:
$filename = strtolower($parts['name']) . '.php';
break;
}
return $filename;
}
}