Trigger SDC render element when using Twig include or embed

For information, UI Patterns 2.x team is also looking for such solution: 📌 [2.0.0-alpha3] Replace component() function by native Twig mechanisms? Active

Remove everything but ::getNodeVisitors() in ComponentsTwigExtension and most of ComponentNodeVisitor

It would also be the opportunity to also remove ComponentElement::generateComponentTemplate() and to simply render:

[
   '#type' => 'inline_template',
   '#template' => $template_loaded_from_file,
  '#context' => $slots + $props,
];

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

It was tied by UI Patterns team in 📌 [2.0.0-alpha3] Replace component() function by native Twig mechanisms? Active

• It was working well with include function
• But it was not possible with embed tag

We can't visit EmbedNode because it doesn't know about:

• the template ID (so the component ID) because it is the parent node (an expression)
• and the blocks (so the slots) because their nodes are elswhere in the AST (in a blocks section)

Maybe we can introduce our own EmbedTokenParser which will know:

• the template ID (so the component ID): $parent->getAttribute("value")
• the variables (so the props): [$variables, $only, $ignoreMissing] = $this->parseArguments();
• and the blocks (so the slots) by exploring the ModuleNode: $module = $this->parser->parse($stream, [$this, 'decideBlockEnd'], true);

But working at the parser level is way harder and risker than working at the AST level.

So, let's not do that. The current rendering method is not perfect but work well anyway.