PatchReader.php

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<?php
namespace Magento\Framework\Setup\Patch;

use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\Config\ReaderInterface;
use Magento\Framework\Filesystem\Glob;
use Magento\Framework\Module\Dir;

class PatchReader
{
    const SETUP_PATCH_FOLDER = 'Patch';

    private $componentRegistrar;

    private $type;

    public function __construct(
        ComponentRegistrar $componentRegistrar,
        $type
    ) {
        $this->componentRegistrar = $componentRegistrar;
        $this->type = $type;
    }

    private function getPatchFolder($modulePath)
    {
        return $modulePath . DIRECTORY_SEPARATOR . Dir::MODULE_SETUP_DIR .
            DIRECTORY_SEPARATOR . self::SETUP_PATCH_FOLDER;
    }

    private function getModuleNameForNamespace($moduleName)
    {
        return str_replace('_', '\\', $moduleName);
    }

    private function getTypeFolder()
    {
        return ucfirst($this->type);
    }

    private function getPatchClassesPerModule($moduleName, $modulePath)
    {
        $patchClasses = [];
        $patchesPath = $this->getPatchFolder($modulePath);
        $specificPatchPath = $patchesPath . DIRECTORY_SEPARATOR . $this->getTypeFolder();
        $patchesMask = $specificPatchPath . DIRECTORY_SEPARATOR . '*.php';

        foreach (Glob::glob($patchesMask) as $patchPath) {
            $moduleName = $this->getModuleNameForNamespace($moduleName);
            $patchClasses[] = $moduleName . '\\Setup\\' .
                self::SETUP_PATCH_FOLDER . '\\' .
                $this->getTypeFolder() . '\\' .
                basename($patchPath, '.php');
        }

        return $patchClasses;
    }

    public function read($moduleName)
    {
        $modulePath = $this->componentRegistrar->getPath(ComponentRegistrar::MODULE, $moduleName);
        $patches = $this->getPatchClassesPerModule($moduleName, $modulePath);
        return $patches;
    }
}