ReaderPool.php

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<?php
namespace Magento\Framework\View\Layout;

use Magento\Framework\View\Layout;

class ReaderPool implements ReaderInterface
{
    protected $readers;

    protected $nodeReaders = [];

    protected $readerFactory;

    public function __construct(
        Layout\ReaderFactory $readerFactory,
        array $readers = []
    ) {
        $this->readerFactory = $readerFactory;
        $this->readers = $readers;
    }

    public function addReader(Layout\ReaderInterface $reader)
    {
        foreach ($reader->getSupportedNodes() as $nodeName) {
            $this->nodeReaders[$nodeName] = $reader;
        }
        return $this;
    }

    public function getSupportedNodes()
    {
        return array_keys($this->nodeReaders);
    }

    protected function prepareReader($readers)
    {
        if (empty($this->nodeReaders)) {
            foreach ($readers as $readerClass) {
                $reader = $this->readerFactory->create($readerClass);
                $this->addReader($reader);
            }
        }
    }

    public function interpret(Reader\Context $readerContext, Layout\Element $element)
    {
        $this->prepareReader($this->readers);
        foreach ($element as $node) {
            $nodeName = $node->getName();
            if (!isset($this->nodeReaders[$nodeName])) {
                continue;
            }
            $reader = $this->nodeReaders[$nodeName];
            $reader->interpret($readerContext, $node, $element);
        }
        return $this;
    }
}