<?php
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Util;

use PHPUnit\Framework\Exception;

/**
* Utility methods to load PHP sourcefiles.
*/
final class FileLoader
{
/**
* Checks if a PHP sourcecode file is readable. The sourcecode file is loaded through the load() method.
*
* As a fallback, PHP looks in the directory of the file executing the stream_resolve_include_path function.
* We do not want to load the Test.php file here, so skip it if it found that.
* PHP prioritizes the include_path setting, so if the current directory is in there, it will first look in the
* current working directory.
*
* @param string $filename
*
* @throws Exception
*
* @return string
*/
public static function checkAndLoad(string $filename): string
{
$includePathFilename = \stream_resolve_include_path($filename);
$localFile = __DIR__ . DIRECTORY_SEPARATOR . $filename;

/**
* @see https://github.com/sebastianbergmann/phpunit/pull/2751
*/
$isReadable = @\fopen($includePathFilename, 'r') !== false;

if (!$includePathFilename || !$isReadable || $includePathFilename === $localFile) {
throw new Exception(
\sprintf('Cannot open file "%s".' . "\n", $filename)
);
}

self::load($includePathFilename);

return $includePathFilename;
}

/**
* Loads a PHP sourcefile.
*
* @param string $filename
*/
public static function load(string $filename): void
{
$oldVariableNames = \array_keys(\get_defined_vars());

include_once $filename;

$newVariables = \get_defined_vars();
$newVariableNames = \array_diff(\array_keys($newVariables), $oldVariableNames);

foreach ($newVariableNames as $variableName) {
if ($variableName !== 'oldVariableNames') {
$GLOBALS[$variableName] = $newVariables[$variableName];
}
}
}
}