Library.php

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<?php
namespace Magento\Framework\Css\PreProcessor\File\Collector;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\Component\ComponentRegistrarInterface;
use Magento\Framework\Filesystem;
use Magento\Framework\Filesystem\Directory\ReadInterface;
use Magento\Framework\View\Design\ThemeInterface;
use Magento\Framework\View\File\CollectorInterface;

class Library implements CollectorInterface
{
    protected $fileFactory;

    protected $libraryDirectory;

    protected $fileListFactory;

    private $readFactory;

    private $componentRegistrar;

    public function __construct(
        \Magento\Framework\View\File\FileList\Factory $fileListFactory,
        Filesystem $filesystem,
        \Magento\Framework\View\File\Factory $fileFactory,
        \Magento\Framework\Filesystem\Directory\ReadFactory $readFactory,
        ComponentRegistrarInterface $componentRegistrar
    ) {
        $this->fileListFactory = $fileListFactory;
        $this->libraryDirectory = $filesystem->getDirectoryRead(
            DirectoryList::LIB_WEB
        );
        $this->fileFactory = $fileFactory;
        $this->readFactory = $readFactory;
        $this->componentRegistrar = $componentRegistrar;
    }

    public function getFiles(ThemeInterface $theme, $filePath)
    {
        $list = $this->fileListFactory->create(\Magento\Framework\Css\PreProcessor\File\FileList\Collator::class);
        $files = $this->libraryDirectory->search($filePath);
        $list->add($this->createFiles($this->libraryDirectory, $theme, $files));

        foreach ($theme->getInheritedThemes() as $currentTheme) {
            $themeFullPath = $currentTheme->getFullPath();
            $path = $this->componentRegistrar->getPath(
                ComponentRegistrar::THEME,
                $themeFullPath
            );
            if (empty($path)) {
                continue;
            }
            $directoryRead = $this->readFactory->create($path);
            $foundFiles = $directoryRead->search("web/{$filePath}");
            $list->replace($this->createFiles($directoryRead, $theme, $foundFiles));
        }
        return $list->getAll();
    }

    protected function createFiles(ReadInterface $reader, ThemeInterface $theme, $files)
    {
        $result = [];
        foreach ($files as $file) {
            $filename = $reader->getAbsolutePath($file);
            $result[] = $this->fileFactory->create($filename, false, $theme);
        }
        return $result;
    }
}