Collector.php

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<?php
namespace Magento\Deploy\Collector;

use Magento\Deploy\Source\SourcePool;
use Magento\Deploy\Package\Package;
use Magento\Deploy\Package\PackageFactory;
use Magento\Framework\View\Asset\PreProcessor\FileNameResolver;

class Collector implements CollectorInterface
{
    private $sourcePool;

    private $fileNameResolver;

    private $packageFactory;

    private $packageDefaultValues = [
        'area' => Package::BASE_AREA,
        'theme' => Package::BASE_THEME,
        'locale' => Package::BASE_LOCALE
    ];

    public function __construct(
        SourcePool $sourcePool,
        FileNameResolver $fileNameResolver,
        PackageFactory $packageFactory
    ) {
        $this->sourcePool = $sourcePool;
        $this->fileNameResolver = $fileNameResolver;
        $this->packageFactory = $packageFactory;
    }

    public function collect()
    {
        $packages = [];
        foreach ($this->sourcePool->getAll() as $source) {
            $files = $source->get();
            foreach ($files as $file) {
                $file->setDeployedFileName($this->fileNameResolver->resolve($file->getFileName()));
                $params = [
                    'area' => $file->getArea(),
                    'theme' => $file->getTheme(),
                    'locale' => $file->getLocale(),
                    'module' => $file->getModule(),
                    'isVirtual' => (!$file->getLocale() || !$file->getTheme() || !$file->getArea())
                ];
                foreach ($this->packageDefaultValues as $name => $value) {
                    if (!isset($params[$name])) {
                        $params[$name] = $value;
                    }
                }
                $packagePath = "{$params['area']}/{$params['theme']}/{$params['locale']}";
                if (!isset($packages[$packagePath])) {
                    $packages[$packagePath] = $this->packageFactory->create($params);
                }
                if ($file->getFilePath()) {
                    $file->setPackage($packages[$packagePath]);
                }
            }
        }
        return $packages;
    }
}