VariableNotation.php

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<?php
namespace Magento\Framework\View\Asset\PreProcessor;

use Magento\Framework\View\Asset;
use Magento\Framework\View\Asset\NotationResolver;
use Magento\Framework\View\Url\CssResolver;

class VariableNotation implements Asset\PreProcessorInterface
{
    private $cssResolver;

    private $notationResolver;

    public function __construct(
        CssResolver $cssResolver,
        NotationResolver\Variable $notationResolver
    ) {
        $this->cssResolver = $cssResolver;
        $this->notationResolver = $notationResolver;
    }

    public function process(Chain $chain)
    {
        $callback = function ($path) {
            return $this->notationResolver->convertVariableNotation($path);
        };
        $chain->setContent($this->cssResolver->replaceRelativeUrls($chain->getContent(), $callback));
    }
}