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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Config\Loader;

use
Symfony\Component\Config\Exception\FileLoaderImportCircularReferenceException;
use
Symfony\Component\Config\Exception\FileLocatorFileNotFoundException;
use
Symfony\Component\Config\Exception\LoaderLoadException;
use
Symfony\Component\Config\FileLocatorInterface;
use
Symfony\Component\Config\Resource\FileExistenceResource;
use
Symfony\Component\Config\Resource\GlobResource;

/**
 * FileLoader is the abstract class used by all built-in loaders that are file based.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
abstract class FileLoader extends Loader
{
    protected static
$loading = [];

    protected
$locator;

    private
$currentDir;

    public function
__construct(FileLocatorInterface $locator)
    {
       
$this->locator = $locator;
    }

   
/**
     * Sets the current directory.
     */
   
public function setCurrentDir(string $dir)
    {
       
$this->currentDir = $dir;
    }

   
/**
     * Returns the file locator used by this loader.
     *
     * @return FileLocatorInterface
     */
   
public function getLocator()
    {
        return
$this->locator;
    }

   
/**
     * Imports a resource.
     *
     * @param mixed                $resource       A Resource
     * @param string|null          $type           The resource type or null if unknown
     * @param bool                 $ignoreErrors   Whether to ignore import errors or not
     * @param string|null          $sourceResource The original resource importing the new resource
     * @param string|string[]|null $exclude        Glob patterns to exclude from the import
     *
     * @return mixed
     *
     * @throws LoaderLoadException
     * @throws FileLoaderImportCircularReferenceException
     * @throws FileLocatorFileNotFoundException
     */
   
public function import($resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null, $exclude = null)
    {
        if (\
is_string($resource) && \strlen($resource) !== $i = strcspn($resource, '*?{[')) {
           
$excluded = [];
            foreach ((array)
$exclude as $pattern) {
                foreach (
$this->glob($pattern, true, $_, false, true) as $path => $info) {
                   
// normalize Windows slashes
                   
$excluded[str_replace('\\', '/', $path)] = true;
                }
            }

           
$ret = [];
           
$isSubpath = 0 !== $i && false !== strpos(substr($resource, 0, $i), '/');
            foreach (
$this->glob($resource, false, $_, $ignoreErrors || !$isSubpath, false, $excluded) as $path => $info) {
                if (
null !== $res = $this->doImport($path, 'glob' === $type ? null : $type, $ignoreErrors, $sourceResource)) {
                   
$ret[] = $res;
                }
               
$isSubpath = true;
            }

            if (
$isSubpath) {
                return isset(
$ret[1]) ? $ret : (isset($ret[0]) ? $ret[0] : null);
            }
        }

        return
$this->doImport($resource, $type, $ignoreErrors, $sourceResource);
    }

   
/**
     * @internal
     */
   
protected function glob(string $pattern, bool $recursive, &$resource = null, bool $ignoreErrors = false, bool $forExclusion = false, array $excluded = [])
    {
        if (\
strlen($pattern) === $i = strcspn($pattern, '*?{[')) {
           
$prefix = $pattern;
           
$pattern = '';
        } elseif (
0 === $i || false === strpos(substr($pattern, 0, $i), '/')) {
           
$prefix = '.';
           
$pattern = '/'.$pattern;
        } else {
           
$prefix = \dirname(substr($pattern, 0, 1 + $i));
           
$pattern = substr($pattern, \strlen($prefix));
        }

        try {
           
$prefix = $this->locator->locate($prefix, $this->currentDir, true);
        } catch (
FileLocatorFileNotFoundException $e) {
            if (!
$ignoreErrors) {
                throw
$e;
            }

           
$resource = [];
            foreach (
$e->getPaths() as $path) {
               
$resource[] = new FileExistenceResource($path);
            }

            return;
        }
       
$resource = new GlobResource($prefix, $pattern, $recursive, $forExclusion, $excluded);

        yield from
$resource;
    }

    private function
doImport($resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null)
    {
        try {
           
$loader = $this->resolve($resource, $type);

            if (
$loader instanceof self && null !== $this->currentDir) {
               
$resource = $loader->getLocator()->locate($resource, $this->currentDir, false);
            }

           
$resources = \is_array($resource) ? $resource : [$resource];
            for (
$i = 0; $i < $resourcesCount = \count($resources); ++$i) {
                if (isset(
self::$loading[$resources[$i]])) {
                    if (
$i == $resourcesCount - 1) {
                        throw new
FileLoaderImportCircularReferenceException(array_keys(self::$loading));
                    }
                } else {
                   
$resource = $resources[$i];
                    break;
                }
            }
           
self::$loading[$resource] = true;

            try {
               
$ret = $loader->load($resource, $type);
            } finally {
                unset(
self::$loading[$resource]);
            }

            return
$ret;
        } catch (
FileLoaderImportCircularReferenceException $e) {
            throw
$e;
        } catch (\
Exception $e) {
            if (!
$ignoreErrors) {
               
// prevent embedded imports from nesting multiple exceptions
               
if ($e instanceof LoaderLoadException) {
                    throw
$e;
                }

                throw new
LoaderLoadException($resource, $sourceResource, null, $e, $type);
            }
        }

        return
null;
    }
}