function ComponentNodeVisitor::leaveNode

File

core/lib/Drupal/Core/Template/ComponentNodeVisitor.php, line 42

Class

ComponentNodeVisitor

Provides a ComponentNodeVisitor to change the generated parse-tree.

Namespace

Code

public function leaveNode(Node $node, Environment $env) : ?Node {
    if (!$node instanceof ModuleNode) {
        return $node;
    }
    $component = $this->getComponent($node);
    if (!$component) {
        return $node;
    }
    $line = $node->getTemplateLine();
    $print_nodes = [];
    $component_id = $component->getPluginId();
    $emoji = static::emojiForString($component_id);
    if ($env->isDebug()) {
        $print_nodes[] = new PrintNode(new ConstantExpression(sprintf('<!-- %s Component start: %s -->', $emoji, $component_id), $line), $line);
    }
    $print_nodes[] = new PrintNode(new FunctionExpression('attach_library', new Node([
        new ConstantExpression($component->getLibraryName(), $line),
    ]), $line), $line);
    $print_nodes[] = new PrintNode(new FunctionExpression('add_component_context', new Node([
        new ConstantExpression($component_id, $line),
    ]), $line), $line);
    $print_nodes[] = new PrintNode(new FunctionExpression('validate_component_props', new Node([
        new ConstantExpression($component_id, $line),
    ]), $line), $line);
    // Append the print nodes to the display_start node.
    $node->setNode('display_start', new Node([
        $node->getNode('display_start'),
        $print_nodes,
    ]));
    if ($env->isDebug()) {
        // Append the closing comment to the display_end node.
        $node->setNode('display_end', new Node([
            new PrintNode(new ConstantExpression(sprintf('<!-- %s Component end: %s -->', $emoji, $component_id), $line), $line),
            $node->getNode('display_end'),
        ]));
    }
    // Slots can be validated at compile time, we don't need to add nodes to
    // execute functions during display with the actual data.
    $this->validateSlots($component, $node->getNode('blocks'));
    return $node;
}