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<?php declare(strict_types=1); namespace Dotenv\Repository\Adapter; final class ImmutableWriter implements WriterInterface { /** * The inner writer to use. * * @var \Dotenv\Repository\Adapter\WriterInterface */ private $writer; /** * The inner reader to use. * * @var \Dotenv\Repository\Adapter\ReaderInterface */ private $reader; /** * The record of loaded variables. * * @var array<string,string> */ private $loaded; /** * Create a new immutable writer instance. * * @param \Dotenv\Repository\Adapter\WriterInterface $writer * @param \Dotenv\Repository\Adapter\ReaderInterface $reader * * @return void */ public function __construct(WriterInterface $writer, ReaderInterface $reader) { $this->writer = $writer; $this->reader = $reader; $this->loaded = []; } /** * Write to an environment variable, if possible. * * @param string $name * @param string $value * * @return bool */ public function write(string $name, string $value) { // Don't overwrite existing environment variables // Ruby's dotenv does this with `ENV[key] ||= value` if ($this->isExternallyDefined($name)) { return false; } // Set the value on the inner writer if (!$this->writer->write($name, $value)) { return false; } // Record that we have loaded the variable $this->loaded[$name] = ''; return true; } /** * Delete an environment variable, if possible. * * @param string $name * * @return bool */ public function delete(string $name) { // Don't clear existing environment variables if ($this->isExternallyDefined($name)) { return false; } // Clear the value on the inner writer if (!$this->writer->delete($name)) { return false; } // Leave the variable as fair game unset($this->loaded[$name]); return true; } /** * Determine if the given variable is externally defined. * * That is, is it an "existing" variable. * * @param string $name * * @return bool */ private function isExternallyDefined(string $name) { return $this->reader->read($name)->isDefined() && !isset($this->loaded[$name]); } }