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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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declare(strict_types=1);
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namespace Dotenv\Loader;
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use Dotenv\Parser\Value;
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use Dotenv\Repository\RepositoryInterface;
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use Dotenv\Util\Regex;
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use Dotenv\Util\Str;
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use PhpOption\Option;
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final class Resolver
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{
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    /**
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     * This class is a singleton.
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     *
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     * @codeCoverageIgnore
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     *
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     * @return void
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     */
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    private function __construct()
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    {
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        //
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    }
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    /**
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     * Resolve the nested variables in the given value.
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     *
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     * Replaces ${varname} patterns in the allowed positions in the variable
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     * value by an existing environment variable.
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     *
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     * @param \Dotenv\Repository\RepositoryInterface $repository
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     * @param \Dotenv\Parser\Value                   $value
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     *
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     * @return string
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     */
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    public static function resolve(RepositoryInterface $repository, Value $value)
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    {
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        return \array_reduce($value->getVars(), static function (string $s, int $i) use ($repository) {
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            return Str::substr($s, 0, $i).self::resolveVariable($repository, Str::substr($s, $i));
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        }, $value->getChars());
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    }
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    /**
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     * Resolve a single nested variable.
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     *
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     * @param \Dotenv\Repository\RepositoryInterface $repository
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     * @param string                                 $str
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     *
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     * @return string
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     */
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    private static function resolveVariable(RepositoryInterface $repository, string $str)
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    {
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        return Regex::replaceCallback(
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            '/\A\${([a-zA-Z0-9_.]+)}/',
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            static function (array $matches) use ($repository) {
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                return Option::fromValue($repository->get($matches[1]))
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                    ->getOrElse($matches[0]);
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            },
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            $str,
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            1
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        )->success()->getOrElse($str);
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    }
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}