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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2011 Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Loads templates from other loaders.
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*
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* @package twig
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_Loader_Chain implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
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{
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private $hasSourceCache = array();
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protected $loaders;
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/**
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* Constructor.
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*
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* @param Twig_LoaderInterface[] $loaders An array of loader instances
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*/
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public function __construct(array $loaders = array())
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{
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$this->loaders = array();
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foreach ($loaders as $loader) {
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$this->addLoader($loader);
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}
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}
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/**
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* Adds a loader instance.
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*
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* @param Twig_LoaderInterface $loader A Loader instance
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*/
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public function addLoader(Twig_LoaderInterface $loader)
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{
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$this->loaders[] = $loader;
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$this->hasSourceCache = array();
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}
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/**
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* {@inheritdoc}
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*/
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public function getSource($name)
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{
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$exceptions = array();
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foreach ($this->loaders as $loader) {
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if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
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continue;
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}
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try {
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return $loader->getSource($name);
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} catch (Twig_Error_Loader $e) {
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$exceptions[] = $e->getMessage();
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}
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}
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throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(', ', $exceptions)));
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}
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/**
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* {@inheritdoc}
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*/
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public function exists($name)
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{
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$name = (string) $name;
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if (isset($this->hasSourceCache[$name])) {
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return $this->hasSourceCache[$name];
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}
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foreach ($this->loaders as $loader) {
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if ($loader instanceof Twig_ExistsLoaderInterface && $loader->exists($name)) {
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return $this->hasSourceCache[$name] = true;
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}
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try {
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$loader->getSource($name);
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return $this->hasSourceCache[$name] = true;
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} catch (Twig_Error_Loader $e) {
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}
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}
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return $this->hasSourceCache[$name] = false;
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}
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/**
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* {@inheritdoc}
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*/
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public function getCacheKey($name)
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{
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$exceptions = array();
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foreach ($this->loaders as $loader) {
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if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
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continue;
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}
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try {
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return $loader->getCacheKey($name);
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} catch (Twig_Error_Loader $e) {
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$exceptions[] = get_class($loader).': '.$e->getMessage();
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}
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}
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throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(' ', $exceptions)));
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}
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/**
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* {@inheritdoc}
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*/
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public function isFresh($name, $time)
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{
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$exceptions = array();
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foreach ($this->loaders as $loader) {
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if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
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continue;
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}
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try {
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return $loader->isFresh($name, $time);
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} catch (Twig_Error_Loader $e) {
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$exceptions[] = get_class($loader).': '.$e->getMessage();
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}
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}
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throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(' ', $exceptions)));
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}
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}
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