function TwigNodeVisitorCheckDeprecations::enterNode

File

core/lib/Drupal/Core/Template/TwigNodeVisitorCheckDeprecations.php, line 36

Class

TwigNodeVisitorCheckDeprecations

Provides a Node Visitor to trigger errors if deprecated variables are used.

Namespace

Code

public function enterNode(Node $node, Environment $env) : Node {
  if ($node instanceof ModuleNode) {
    $this->usedNames = [];
    $this->assignedNames = [];
  }
  elseif ($node instanceof AssignNameExpression) {
    // Setting a variable makes subsequent usage is safe.
    $this->assignedNames[$node->getAttribute('name')] = $node->getAttribute('name');
  }
  elseif ($node instanceof NameExpression) {
    // Track each usage of a variable, unless set within the template.
    $name = $node->getAttribute('name');
    if (!in_array($name, $this->assignedNames)) {
      $this->usedNames[$name] = $name;
    }
  }
  return $node;
}