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<?php declare(strict_types=1);
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/*
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 * This file is part of phpunit/php-file-iterator.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace SebastianBergmann\FileIterator;
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use const GLOB_ONLYDIR;
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use function array_filter;
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use function array_map;
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use function array_merge;
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use function glob;
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use function is_dir;
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use function is_string;
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use function realpath;
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use AppendIterator;
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use RecursiveDirectoryIterator;
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use RecursiveIteratorIterator;
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class Factory
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{
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    /**
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     * @param array|string $paths
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     * @param array|string $suffixes
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     * @param array|string $prefixes
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     */
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    public function getFileIterator($paths, $suffixes = '', $prefixes = '', array $exclude = []): AppendIterator
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    {
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        if (is_string($paths)) {
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            $paths = [$paths];
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        }
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        $paths   = $this->getPathsAfterResolvingWildcards($paths);
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        $exclude = $this->getPathsAfterResolvingWildcards($exclude);
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        if (is_string($prefixes)) {
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            if ($prefixes !== '') {
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                $prefixes = [$prefixes];
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            } else {
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                $prefixes = [];
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            }
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        }
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        if (is_string($suffixes)) {
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            if ($suffixes !== '') {
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                $suffixes = [$suffixes];
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            } else {
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                $suffixes = [];
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            }
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        }
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        $iterator = new AppendIterator;
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        foreach ($paths as $path) {
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            if (is_dir($path)) {
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                $iterator->append(
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                    new Iterator(
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                        $path,
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                        new RecursiveIteratorIterator(
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                            new RecursiveDirectoryIterator($path, RecursiveDirectoryIterator::FOLLOW_SYMLINKS | RecursiveDirectoryIterator::SKIP_DOTS)
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                        ),
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                        $suffixes,
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                        $prefixes,
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                        $exclude
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                    )
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                );
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            }
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        }
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        return $iterator;
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    }
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    protected function getPathsAfterResolvingWildcards(array $paths): array
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    {
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        $_paths = [[]];
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        foreach ($paths as $path) {
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            if ($locals = glob($path, GLOB_ONLYDIR)) {
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                $_paths[] = array_map('\realpath', $locals);
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            } else {
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                $_paths[] = [realpath($path)];
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            }
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        }
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        return array_filter(array_merge(...$_paths));
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    }
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}