Body.php

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<?php
namespace Magento\Framework\View\Page\Config\Generator;

use Magento\Framework\View\Layout;
use Magento\Framework\View\Page\Config\Structure;

class Body implements Layout\GeneratorInterface
{
    const TYPE = 'body';

    private $pageConfig;

    public function __construct(\Magento\Framework\View\Page\Config $pageConfig)
    {
        $this->pageConfig = $pageConfig;
    }

    public function getType()
    {
        return self::TYPE;
    }

    public function process(Layout\Reader\Context $readerContext, Layout\Generator\Context $generatorContext)
    {
        $structure = $readerContext->getPageConfigStructure();
        $this->processBodyClasses($structure);
        return $this;
    }

    protected function processBodyClasses(Structure $pageStructure)
    {
        foreach ($pageStructure->getBodyClasses() as $class) {
            $this->pageConfig->addBodyClass($class);
        }
        return $this;
    }
}