Theme.php

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<?php
namespace Magento\Framework\View\File\Collector;

use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\Component\ComponentRegistrarInterface;
use Magento\Framework\Filesystem\Directory\ReadFactory;
use Magento\Framework\View\Design\ThemeInterface;
use Magento\Framework\View\File\CollectorInterface;
use Magento\Framework\View\File\Factory as FileFactory;

class Theme implements CollectorInterface
{
    private $fileFactory;

    private $readDirFactory;

    private $componentRegistrar;

    private $subDir;

    public function __construct(
        FileFactory $fileFactory,
        ReadFactory $readDirFactory,
        ComponentRegistrarInterface $componentRegistrar,
        $subDir = ''
    ) {
        $this->fileFactory = $fileFactory;
        $this->readDirFactory = $readDirFactory;
        $this->componentRegistrar = $componentRegistrar;
        $this->subDir = $subDir ? $subDir . '/' : '';
    }

    public function getFiles(ThemeInterface $theme, $filePath)
    {
        $themePath = $theme->getFullPath();
        if (empty($themePath)) {
            return [];
        }
        $themeAbsolutePath = $this->componentRegistrar->getPath(ComponentRegistrar::THEME, $themePath);
        if (!$themeAbsolutePath) {
            return [];
        }
        $themeDir = $this->readDirFactory->create($themeAbsolutePath);
        $files = $themeDir->search($this->subDir . $filePath);
        $result = [];
        foreach ($files as $file) {
            $filename = $themeDir->getAbsolutePath($file);
            $result[] = $this->fileFactory->create($filename, null, $theme);
        }
        return $result;
    }
}