ReplacingWriter.php
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<?php
declare(strict_types=1);
namespace Dotenv\Repository\Adapter;
final class ReplacingWriter 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 seen variables.
*
* @var array<string,string>
*/
private $seen;
/**
* Create a new replacement 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->seen = [];
}
/**
* Write to an environment variable, if possible.
*
* @param non-empty-string $name
* @param string $value
*
* @return bool
*/
public function write(string $name, string $value)
{
if ($this->exists($name)) {
return $this->writer->write($name, $value);
}
// succeed if nothing to do
return true;
}
/**
* Delete an environment variable, if possible.
*
* @param non-empty-string $name
*
* @return bool
*/
public function delete(string $name)
{
if ($this->exists($name)) {
return $this->writer->delete($name);
}
// succeed if nothing to do
return true;
}
/**
* Does the given environment variable exist.
*
* Returns true if it currently exists, or existed at any point in the past
* that we are aware of.
*
* @param non-empty-string $name
*
* @return bool
*/
private function exists(string $name)
{
if (isset($this->seen[$name])) {
return true;
}
if ($this->reader->read($name)->isDefined()) {
$this->seen[$name] = '';
return true;
}
return false;
}
}