66 lines
1.7 KiB
PHP
66 lines
1.7 KiB
PHP
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<?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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}
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