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<?php
namespace Drupal\Core\Template;
/**
* Provides a Twig_NodeVisitor to change the generated parse-tree.
*
* This is used to ensure that everything printed is wrapped via the
* TwigExtension->renderVar() function in order to just write {{ content }}
* in templates instead of having to write {{ render_var(content) }}.
*
* @see twig_render
*/
class TwigNodeVisitor extends \Twig_BaseNodeVisitor {
/**
* {@inheritdoc}
*/
protected function doEnterNode(\Twig_Node $node, \Twig_Environment $env) {
return $node;
}
/**
* {@inheritdoc}
*/
protected function doLeaveNode(\Twig_Node $node, \Twig_Environment $env) {
// We use this to inject a call to render_var -> TwigExtension->renderVar()
// before anything is printed.
if ($node instanceof \Twig_Node_Print) {
if (!empty($this->skipRenderVarFunction)) {
// No need to add the callback, we have escape active already.
unset($this->skipRenderVarFunction);
return $node;
}
$class = get_class($node);
$line = $node->getLine();
return new $class(
new \Twig_Node_Expression_Function('render_var', new \Twig_Node([$node->getNode('expr')]), $line),
$line
);
}
// Change the 'escape' filter to our own 'drupal_escape' filter.
elseif ($node instanceof \Twig_Node_Expression_Filter) {
$name = $node->getNode('filter')->getAttribute('value');
if ('escape' == $name || 'e' == $name) {
// Use our own escape filter that is SafeMarkup aware.
$node->getNode('filter')->setAttribute('value', 'drupal_escape');
// Store that we have a filter active already that knows how to deal with render arrays.
$this->skipRenderVarFunction = TRUE;
}
}
return $node;
}
/**
* {@inheritdoc}
*/
public function getPriority() {
// Just above the Optimizer, which is the normal last one.
return 256;
}
}