/**
* Renders a template.
*
* 1. This function first looks for a block named "_<view id>_<section>",
* 2. if such a block is not found the function will look for a block named
* "<type name>_<section>",
* 3. the type name is recursively replaced by the parent type name until a
* corresponding block is found
*
* @param FormView $view The form view
* @param string $section The section to render (i.e. 'row', 'widget', 'label', ...)
* @param array $variables Additional variables
*
* @return string The html markup
*
* @throws FormException if no template block exists to render the given section of the view
*/
protected function render(FormView $view, $section, array $variables = array())
{
$mainTemplate = in_array($section, array('widget', 'row'));
if ($mainTemplate && $view->isRendered()) {
return '';
}
if (null === $this->template) {
$this->template = reset($this->resources);
if (!$this->template instanceof \Twig_Template) {
$this->template = $this->environment->loadTemplate($this->template);
}
}
$custom = '_' . $view->getVar('id');
$rendering = $custom . $section;
$blocks = $this->getBlocks($view);
if (isset($this->varStack[$rendering])) {
$typeIndex = $this->varStack[$rendering]['typeIndex'] - 1;
$types = $this->varStack[$rendering]['types'];
$this->varStack[$rendering]['variables'] = array_replace_recursive($this->varStack[$rendering]['variables'], $variables);
} else {
$types = $view->getVar('types');
$types[] = $custom;
$typeIndex = count($types) - 1;
$this->varStack[$rendering] = array('variables' => array_replace_recursive($view->getVars(), $variables), 'types' => $types);
}
do {
$types[$typeIndex] .= '_' . $section;
if (isset($blocks[$types[$typeIndex]])) {
$this->varStack[$rendering]['typeIndex'] = $typeIndex;
// we do not call renderBlock here to avoid too many nested level calls (XDebug limits the level to 100 by default)
ob_start();
$this->template->displayBlock($types[$typeIndex], $this->varStack[$rendering]['variables'], $blocks);
$html = ob_get_clean();
if ($mainTemplate) {
$view->setRendered();
}
unset($this->varStack[$rendering]);
return $html;
}
} while (--$typeIndex >= 0);
throw new FormException(sprintf('Unable to render the form as none of the following blocks exist: "%s".', implode('", "', array_reverse($types))));
}
/**
* Returns the name of the template to use to render the block
*
* @param FormView $view The form view
* @param string $block The name of the block
*
* @return string|Boolean The template logical name or false when no template is found
*/
protected function lookupTemplate(FormView $view, $block)
{
$file = $block . '.html.php';
$id = $view->getVar('id');
if (!isset($this->templates[$id][$block])) {
$template = false;
$themes = $view->hasParent() ? array() : $this->resources;
if (isset($this->themes[$id])) {
$themes = array_merge($themes, $this->themes[$id]);
}
for ($i = count($themes) - 1; $i >= 0; --$i) {
if ($this->engine->exists($templateName = $themes[$i] . ':' . $file)) {
$template = $templateName;
break;
}
}
if (false === $template && $view->hasParent()) {
$template = $this->lookupTemplate($view->getParent(), $block);
}
$this->templates[$id][$block] = $template;
}
return $this->templates[$id][$block];
}