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