first commit

vendor/vlucas/phpdotenv/src/Loader/Resolver.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dotenv\Loader;
+
+use Dotenv\Parser\Value;
+use Dotenv\Repository\RepositoryInterface;
+use Dotenv\Util\Regex;
+use Dotenv\Util\Str;
+use PhpOption\Option;
+
+final class Resolver
+{
+    /**
+     * This class is a singleton.
+     *
+     * @codeCoverageIgnore
+     *
+     * @return void
+     */
+    private function __construct()
+    {
+        //
+    }
+
+    /**
+     * Resolve the nested variables in the given value.
+     *
+     * Replaces ${varname} patterns in the allowed positions in the variable
+     * value by an existing environment variable.
+     *
+     * @param \Dotenv\Repository\RepositoryInterface $repository
+     * @param \Dotenv\Parser\Value                   $value
+     *
+     * @return string
+     */
+    public static function resolve(RepositoryInterface $repository, Value $value)
+    {
+        return \array_reduce($value->getVars(), static function (string $s, int $i) use ($repository) {
+            return Str::substr($s, 0, $i).self::resolveVariable($repository, Str::substr($s, $i));
+        }, $value->getChars());
+    }
+
+    /**
+     * Resolve a single nested variable.
+     *
+     * @param \Dotenv\Repository\RepositoryInterface $repository
+     * @param string                                 $str
+     *
+     * @return string
+     */
+    private static function resolveVariable(RepositoryInterface $repository, string $str)
+    {
+        return Regex::replaceCallback(
+            '/\A\${([a-zA-Z0-9_.]+)}/',
+            static function (array $matches) use ($repository) {
+                return Option::fromValue($repository->get($matches[1]))
+                    ->getOrElse($matches[0]);
+            },
+            $str,
+            1
+        )->success()->getOrElse($str);
+    }
+}