function __construct($root = null)
{
$this->root = $root;
$this->loadPaths = new FileUtils\PathStack($this->root);
$this->engines = Template::getEngines();
# Enable resolving logical paths without extension.
$this->loadPaths->appendExtensions(array_keys($this->engines->getEngines()));
$this->loadPaths->appendExtensions(array_keys($this->contentTypes));
$this->preProcessors = new ProcessorRegistry();
$this->postProcessors = new ProcessorRegistry();
$this->bundleProcessors = new ProcessorRegistry();
$this->registerEngine('\\Pipe\\JstProcessor', '.jst');
# Override Mustache compiler with more useful Mustache to JS compiler,
# which is usable with the JST processor
$this->registerEngine('\\MetaTemplate\\Template\\MustacheJsTemplate', '.mustache');
# Register default processors
$this->registerPreProcessor('text/css', '\\Pipe\\ImportProcessor');
$this->registerPreProcessor('text/css', '\\Pipe\\DirectiveProcessor');
$this->registerPreProcessor('application/javascript', '\\Pipe\\DirectiveProcessor');
$this->registerPostProcessor('application/javascript', '\\Pipe\\SafetyColons');
}
