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A proxy renderer for agavi, which allows fallback to another renderer, if the first one fails.
<?php
/**
* The AgaviProxyRenderer will try to load multiple renderers by name and
* return the first successful attempt to render the given layer.
*
* This allows you to mix e.g. .twig and .php templates in the same directory,
* but still use the proper renderer for each file.
*
* @example <pre>
* <!-- Add this to the output_types.xml -->
* <renderer name="proxy" class="AgaviProxyRenderer">
* <ae:parameter name="renderers">
* <ae:parameter>twig</ae:parameter>
* <ae:parameter>php</ae:parameter>
* </ae:parameter>
* </renderer>
* </pre>
*/
class AgaviProxyRenderer extends AgaviRenderer
{
public function render(AgaviTemplateLayer $layer, array &$attributes = array(), array &$slots = array(), array &$moreAssigns = array())
{
/*
* FIXME: Maybe there is a better way to retrieve the output type for the given layer
* and the current renderer.
*/
if (!isset($moreAssigns['container']))
{
throw new AgaviException('Cannot find container in moreAssigns.');
}
$container = $moreAssigns['container'];
$output_type = $container->getOutputType();
$layer_extension = $layer->getParameter('extension');
$attempts = array();
foreach ($this->getParameter('renderers') as $renderer_name)
{
/**
* @var $renderer AgaviRenderer
*/
$renderer = $output_type->getRenderer($renderer_name);
try
{
/*
* We need to reconnect the layer to the renderer, since it relies on the
* renderer-property to get the the default extension.
*/
$layer->setRenderer($renderer);
/*
* Setting the renderer is not enough, because we may have the extension set in a previous
* iteration. So we have to remove the parameter, if we want to rely on agavi's default
* behaviour.
*/
if ($layer_extension)
{
$attempts[] = '"' . $renderer_name . '" with extension: ' . $layer_extension;
$layer->setParameter('extension', $layer_extension);
}
else
{
$attempts[] = '"' . $renderer_name . '" with extension: ' . $renderer->getDefaultExtension();
$layer->removeParameter('extension');
}
return $renderer->render($layer, $attributes, $slots, $moreAssigns);
}
catch (AgaviException $exception)
{
/*
* Ooops, it didn't work. Let's try the next one. BUT if we get a real agavi exception,
* throw it. See AgaviStreamTemplateLayer.class.php#L104
*/
if (strpos($exception->getMessage(), ' could not be found') < 0)
{
throw $exception;
}
}
}
/*
* no template found, time to throw an exception
*/
throw new AgaviException('Loading the template "' . $layer->getTemplate() . '" with ' . get_class($this) . ' failed. ' . "\n\n" . 'Renderers tried:' . "\n - " . implode("\n - ", $attempts));
}
}
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