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<?php
namespace Timber;
use Timber\Helper;
/**
* FunctionWrapper Class.
*
* With Timber, we want to prepare all the data before we echo content through a render function. Some functionality in WordPress directly echoes output instead of returning it. This class makes it easier to store the results of an echoing function by using ob_start() and ob_end_clean() behind the scenes.
*
* @package Timber
*/
class FunctionWrapper {
private $_class;
private $_function;
private $_args;
private $_use_ob;
public function __toString() {
try {
return (string) $this->call();
} catch ( \Exception $e ) {
return 'Caught exception: '.$e->getMessage()."\n";
}
}
/**
*
*
* @param callable $function
* @param array $args
* @param bool $return_output_buffer
*/
public function __construct( $function, $args = array(), $return_output_buffer = false ) {
if ( is_array($function) ) {
if ( (is_string($function[0]) && class_exists($function[0])) || gettype($function[0]) === 'object' ) {
$this->_class = $function[0];
}
if ( is_string($function[1]) ) {
$this->_function = $function[1];
}
} else {
$this->_function = $function;
}
$this->_args = $args;
$this->_use_ob = $return_output_buffer;
/**
* @deprecated since 1.3.0
* @todo remove in 1.4.0
*/
add_filter('timber/twig', array(&$this, 'add_to_twig'));
}
/**
* Make function available in Twig.
*
* When a function is added more than once, addFunction() will throw a LogicException that states that the function
* is already registered. By catching this exception, we can prevent a fatal error.
* @see \Twig\Extension\StagingExtension::addFunction()
*
* @deprecated since 1.3.0
* @todo remove in 1.4.0
* @param \Twig\Environment $twig
* @return \Twig\Environment
*/
public function add_to_twig( $twig ) {
$wrapper = $this;
try {
$twig->addFunction( new Twig_Function( $this->_function, function() use ( $wrapper ) {
return call_user_func_array( array( $wrapper, 'call' ), func_get_args() );
} ) );
// Use empty 'catch' block and not 'finally', because finally needs PHP 5.5 to work.
} catch ( \Exception $e ) {}
return $twig;
}
/**
*
*
* @return string
*/
public function call() {
$args = $this->_parse_args(func_get_args(), $this->_args);
$callable = (isset($this->_class)) ? array($this->_class, $this->_function) : $this->_function;
if ( $this->_use_ob ) {
return Helper::ob_function($callable, $args);
} else {
return call_user_func_array($callable, $args);
}
}
/**
*
*
* @param array $args
* @param array $defaults
* @return array
*/
private function _parse_args( $args, $defaults ) {
$_arg = reset($defaults);
foreach ( $args as $index => $arg ) {
$defaults[$index] = is_null($arg) ? $_arg : $arg;
$_arg = next($defaults);
}
return $defaults;
}
}