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<?php
/**
* Twig view renderer
*
* @author Leonid Svyatov <leonid@svyatov.ru>
* @author Alexander Makarov <sam@rmcreative.ru>
* @author Nikolas Evers <hello@nikol.as>
* @link https://github.com/vintagesucks/twig-renderer
* @link https://twig.symfony.com/
*
* @version 3.0.0
*/
class ETwigViewRenderer extends CApplicationComponent implements IViewRenderer
{
/**
* @var string Path alias to Twig
*/
public $twigPathAlias = 'application.vendor.Twig';
/**
* @var string Twig template files extension
*/
public $fileExtension = '.twig';
/**
* @var array Twig environment options
* @see https://twig.symfony.com/doc/3.x/api.html#environment-options
*/
public $options = array();
/**
* @var array Objects or static classes
* Keys of array are names to call in template, values - objects or names of static class as string
* Example: array('html'=>'CHtml', 'clientScript'=>Yii::app()->clientScript)
* Than in template: {{ html.link('Login', 'site/login') }} or {{ clientScript.registerCssFile(...) }}
*/
public $globals = array();
/**
* @var array Custom functions
* Keys of array are names to call in template, values - names of functions or static methods of some class
* Example: array('rot13'=>'str_rot13', 'link'=>'CHtml::link')
* Than in template: {{ rot13('test') }} or {{ link('Login', 'site/login') }}
*/
public $functions = array();
/**
* @var array Custom filters
* Keys of array are names to call in template, values - names of functions or static methods of some class
* Example: array('rot13'=>'str_rot13', 'jsonEncode'=>'CJSON::encode')
* Then in template: {{ 'test'|rot13 }} or {{ model|jsonEncode }}
*/
public $filters = array();
/**
* @var array Custom extensions
* Example: array('Twig_Extension_Sandbox', 'Twig_Extension_Text')
*/
public $extensions = array();
/**
* @var array Twig lexer options
* @see https://twig.symfony.com/doc/3.x/recipes.html#customizing-the-syntax
* Example: Smarty-like syntax
* array(
* 'tag_comment' => array('{*', '*}'),
* 'tag_block' => array('{', '}'),
* 'tag_variable' => array('{$', '}')
* )
*/
public $lexerOptions = array();
private $_twig;
private $_paths;
function init()
{
$app = Yii::app();
/** @var $theme CTheme */
$theme = method_exists($app, 'getTheme') ? $app->getTheme() : null;
$this->_paths = array();
if ($theme !== null) {
$this->_paths[] = $theme->getBasePath();
}
$this->_paths[] = $app->getBasePath();
$loader = new \Twig\Loader\FilesystemLoader($this->_paths);
$defaultOptions = array(
'autoescape' => false, // false because other way Twig escapes all HTML in templates
'auto_reload' => true,
'cache' => $app->getRuntimePath() . '/twig_cache/',
'charset' => $app->charset,
);
$this->_twig = new \Twig\Environment($loader, array_merge($defaultOptions, $this->options));
// Adding Yii::app() object to globals
$this->_twig->addGlobal('App', $app);
// Adding Yii's core static classes proxy as 'C' shortcut (usage: {{C.Html.tag(...)}})
$this->_twig->addGlobal('C', new ETwigViewRendererYiiCoreStaticClassesProxy());
// Adding global 'void' function (usage: {{void(App.clientScript.registerScriptFile(...))}})
// (@see ETwigViewRendererVoidFunction below for details)
$this->_twig->addFunction(new \Twig\TwigFunction('void', 'ETwigViewRendererVoidFunction'));
// Adding custom globals (objects or static classes)
if (!empty($this->globals)) {
$this->addGlobals($this->globals);
}
// Adding custom functions
if (!empty($this->functions)) {
$this->addFunctions($this->functions);
}
// Adding custom filters
if (!empty($this->filters)) {
$this->addFilters($this->filters);
}
// Adding custom extensions
if (!empty($this->extensions)) {
$this->addExtensions($this->extensions);
}
// Change lexer syntax
if (!empty($this->lexerOptions)) {
$this->setLexerOptions($this->lexerOptions);
}
return parent::init();
}
/**
* Renders a view file.
* This method is required by {@link IViewRenderer}.
* @param CBaseController $context the controller or widget who is rendering the view file.
* @param string $sourceFile the view file path
* @param mixed $data the data to be passed to the view
* @param boolean $return whether the rendering result should be returned
* @return mixed the rendering result, or null if the rendering result is not needed.
*/
public function renderFile($context, $sourceFile, $data, $return)
{
// current controller properties will be accessible as {{ this.property }}
$data['this'] = $context;
$sourceFile = realpath($sourceFile); // to prevent common problems with paths associated with symlinks
foreach($this->_paths as $path) {
if(strpos($sourceFile, $path) === 0) {
$sourceFile = substr($sourceFile, strlen($path));
break;
}
}
$template = $this->_twig->render($sourceFile, $data);
if ($return) {
return $template;
}
echo $template;
}
/**
* Adds global objects or static classes
* @param array $globals @see self::$globals
*/
public function addGlobals($globals)
{
foreach ($globals as $name => $value) {
if (!is_object($value)) {
$value = new ETwigViewRendererStaticClassProxy($value);
}
$this->_twig->addGlobal($name, $value);
}
}
/**
* Adds custom functions
* @param array $functions @see self::$functions
*/
public function addFunctions($functions)
{
$this->_addCustom('Function', $functions);
}
/**
* Adds custom filters
* @param array $filters @see self::$filters
*/
public function addFilters($filters)
{
$this->_addCustom('Filter', $filters);
}
/**
* Adds custom extensions
* @param array $extensions @see self::$extensions
*/
public function addExtensions($extensions)
{
foreach ($extensions as $extName) {
$this->_twig->addExtension(new $extName());
}
}
/**
* Sets Twig lexer options to change templates syntax
* @param array $options @see self::$lexerOptions
*/
public function setLexerOptions($options)
{
$lexer = new Twig\Lexer($this->_twig, $options);
$this->_twig->setLexer($lexer);
}
/**
* Returns Twig object
* @return Twig\Environment
*/
public function getTwig()
{
return $this->_twig;
}
/**
* Adds custom function or filter
* @param string $classType 'Function' or 'Filter'
* @param array $elements Parameters of elements to add
* @throws CException
*/
private function _addCustom($classType, $elements)
{
$classFunction = '\Twig\Twig' . $classType;
foreach ($elements as $name => $func) {
$twigElement = null;
switch ($func) {
// Just a name of function
case is_string($func):
$twigElement = new $classFunction($name, $func);
break;
// Name of function + options array
case is_array($func) && is_string($func[0]) && isset($func[1]) && is_array($func[1]):
$twigElement = new $classFunction($name, $func[0], $func[1]);
break;
}
if ($twigElement !== null) {
$this->_twig->{'add'.$classType}($twigElement);
} else {
throw new CException(Yii::t('yiiext',
'Incorrect options for "{classType}" [{name}]',
array('{classType}'=>$classType, '{name}'=>$name)));
}
}
}
}
/**
* Class-proxy for static classes
* Needed because you can't pass static class to Twig other way
*
* @author Leonid Svyatov <leonid@svyatov.ru>
* @version 1.0.0
*/
class ETwigViewRendererStaticClassProxy
{
private $_staticClassName;
public function __construct($staticClassName) {
$this->_staticClassName = $staticClassName;
}
public function __get($property)
{
$class = new ReflectionClass($this->_staticClassName);
return $class->getStaticPropertyValue($property);
}
public function __set($property, $value)
{
$class = new ReflectionClass($this->_staticClassName);
$class->setStaticPropertyValue($property, $value);
return $value;
}
public function __call($method, $arguments)
{
return call_user_func_array(array($this->_staticClassName, $method), $arguments);
}
}
/**
* Class-proxy for Yii core static classes
*
* @author Leonid Svyatov <leonid@svyatov.ru>
* @version 1.0.0
*/
class ETwigViewRendererYiiCoreStaticClassesProxy
{
private $_classes = array();
function __isset($className)
{
return (isset($_classes[$className]) || class_exists('C'.$className));
}
function __get($className)
{
if (!isset($this->_classes[$className])) {
$this->_classes[$className] = new ETwigViewRendererStaticClassProxy('C'.$className);
}
return $this->_classes[$className];
}
}
/**
* Function for adding global 'void' function in Twig
* Needed to make possible to call functions and methods which return non-string result (object, resources and etc.)
* For example: {{ void(App.clientScript.registerScriptFile(...)) }}
*
* @param mixed $argument
* @return string
*/
function ETwigViewRendererVoidFunction($argument)
{
return '';
}