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Revision Autor Zeilennr. Zeile
148 lars 1 
<?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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}