1

Based on this description of Magento 2's layout rendering, where is the remove tag implemented in Magento?

That is, in a Magento 2 layout handle XML, you can tell Magento not to render a block with code that looks like this

<referenceBlock name="product.info.media.image" remove="true"/>

It's not clear what the remove tag is doing. Where is this block removed? It it at the layout handle XML parsing stage? The reader/scheduler stage? The generation stage? Somewhere else?

2

Looks like both the container and block reader/scheduler

vendor/magento/framework/View/Layout/Reader/Container.php
vendor/magento/framework/View/Layout/Reader/Block.php

have code that looks something like this

    $containerRemove = filter_var($currentElement->getAttribute('remove'), FILTER_VALIDATE_BOOLEAN);

    if ($containerRemove) {
        $scheduledStructure->setElementToRemoveList($containerName);
    } else {
        $this->mergeContainerAttributes($scheduledStructure, $currentElement);
    }

i.e., the readers look for references with remove blocks, and then schedule the remove.

The block itself is actually removed when the GeneratorPool does the initial build out of the layout structure

#File: vendor/magento/framework/View/Layout/GeneratorPool.php
foreach ($scheduledStructure->getListToRemove() as $elementToRemove) {
    $this->removeElement($scheduledStructure, $structure, $elementToRemove);
}

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