update src attribute using event

[ghost]

Using the commonmark package the first time this excessive.

I've used the code to add a class to an image to make images hidden, since we are facing much abuses when users are allowed to inlclude images by markdown.

The idea was:

• register event listener, hook up into the DocumentParsedEvent
• modify the src element of every image instance (I've taken the idea from the render part here)

ImageManipulatorProcessor

public function __invoke(DocumentParsedEvent $e)
    {
        $walker = $e->getDocument()->walker();

        while ($event = $walker->next()) {
            $node = $event->getNode();

            if (!($node instanceof Image) || !$event->isEntering()) {
                continue;
            }

            if ($node instanceof Image) {
                $node->data['attributes']['src'] = '';
            }
        }
    }

Is it not possible to change already set attributes after they are rendered? How to update the src attribute if so?

[colinodell]

The src is not stored in the attributes array - Image extends from AbstractWebResource which stores the URL in its own field. Your code should work with a simple change:

public function __invoke(DocumentParsedEvent $e)
    {
        $walker = $e->getDocument()->walker();

        while ($event = $walker->next()) {
            $node = $event->getNode();

            if (!($node instanceof Image) || !$event->isEntering()) {
                continue;
            }

            if ($node instanceof Image) {
-               $node->data['attributes']['src'] = '';
+               $node->setUrl('');
            }
        }
    }

Alternatively, if your goal is to completely remove the image, you could try removing the whole image element from the AST here (though that might be complex to implement since I don't think $node->detach() plays nicely with the walker).

Another option would be replacing the image renderer with something that always returns an empty string.

Or you could disable/remove the BangParser so that ! isn't treated as a special character.

I hope this helps!

[ghost]

@colinodell Thanks, working fine, I'll stay with the replacing function of the src attribute. I think this will be the easiest way at the moment, so I can stay using the DocumentParsedEvent.