Initial commit

vendor/vlucas/phpdotenv/src/Repository/Adapter/ReplacingWriter.php

@@ -0,0 +1,104 @@
+<?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;
+    }
+}