jaeger-client -> opentelemetry

vendor/open-telemetry/sdk/Common/Util/WeakMap.php

@@ -0,0 +1,175 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Util;
+
+use ArrayAccess;
+use function assert;
+use function class_exists;
+use function count;
+use Countable;
+use Error;
+use function get_class;
+use function is_object;
+use IteratorAggregate;
+use const PHP_VERSION_ID;
+use function spl_object_id;
+use function sprintf;
+use Traversable;
+use TypeError;
+use WeakReference;
+
+/**
+ * @internal
+ */
+final class WeakMap implements ArrayAccess, Countable, IteratorAggregate
+{
+    private const KEY = '__otel_weak_map';
+
+    /**
+     * @var array<int, WeakReference>
+     */
+    private array $objects = [];
+
+    private function __construct()
+    {
+    }
+
+    /**
+     * @return ArrayAccess&Countable&IteratorAggregate
+     */
+    public static function create(): ArrayAccess
+    {
+        if (PHP_VERSION_ID >= 80000) {
+            /** @phan-suppress-next-line PhanUndeclaredClassReference */
+            assert(class_exists(\WeakMap::class, false));
+            /** @phan-suppress-next-line PhanUndeclaredClassMethod */
+            $map = new \WeakMap();
+            assert($map instanceof ArrayAccess);
+            assert($map instanceof Countable);
+            assert($map instanceof IteratorAggregate);
+
+            return $map;
+        }
+
+        return new self();
+    }
+
+    public function offsetExists($offset): bool
+    {
+        if (!is_object($offset)) {
+            throw new TypeError('WeakMap key must be an object');
+        }
+
+        return isset($offset->{self::KEY}[spl_object_id($this)]);
+    }
+
+    /**
+     * @phan-suppress PhanUndeclaredClassAttribute
+     */
+    #[\ReturnTypeWillChange]
+    public function offsetGet($offset)
+    {
+        if (!is_object($offset)) {
+            throw new TypeError('WeakMap key must be an object');
+        }
+        if (!$this->contains($offset)) {
+            throw new Error(sprintf('Object %s#%d not contained in WeakMap', get_class($offset), spl_object_id($offset)));
+        }
+
+        return $offset->{self::KEY}[spl_object_id($this)];
+    }
+
+    public function offsetSet($offset, $value): void
+    {
+        if ($offset === null) {
+            throw new Error('Cannot append to WeakMap');
+        }
+        if (!is_object($offset)) {
+            throw new TypeError('WeakMap key must be an object');
+        }
+        if (!$this->contains($offset)) {
+            $this->expunge();
+        }
+
+        $offset->{self::KEY}[spl_object_id($this)] = $value;
+        $this->objects[spl_object_id($offset)] = WeakReference::create($offset);
+    }
+
+    public function offsetUnset($offset): void
+    {
+        if (!is_object($offset)) {
+            throw new TypeError('WeakMap key must be an object');
+        }
+        if (!$this->contains($offset)) {
+            return;
+        }
+
+        unset(
+            $offset->{self::KEY}[spl_object_id($this)],
+            $this->objects[spl_object_id($offset)],
+        );
+        if (!$offset->{self::KEY}) {
+            unset($offset->{self::KEY});
+        }
+    }
+
+    public function count(): int
+    {
+        $this->expunge();
+
+        return count($this->objects);
+    }
+
+    public function getIterator(): Traversable
+    {
+        $this->expunge();
+
+        foreach ($this->objects as $reference) {
+            if (($object = $reference->get()) && $this->contains($object)) {
+                yield $object => $this[$object];
+            }
+        }
+    }
+
+    public function __debugInfo(): array
+    {
+        $debugInfo = [];
+        foreach ($this as $key => $value) {
+            $debugInfo[] = ['key' => $key, 'value' => $value];
+        }
+
+        return $debugInfo;
+    }
+
+    public function __destruct()
+    {
+        foreach ($this->objects as $reference) {
+            if ($object = $reference->get()) {
+                unset($this[$object]);
+            }
+        }
+    }
+
+    private function contains(object $offset): bool
+    {
+        $reference = $this->objects[spl_object_id($offset)] ?? null;
+        if ($reference && $reference->get() === $offset) {
+            return true;
+        }
+
+        unset($this->objects[spl_object_id($offset)]);
+
+        return false;
+    }
+
+    private function expunge(): void
+    {
+        foreach ($this->objects as $id => $reference) {
+            if (!$reference->get()) {
+                unset($this->objects[$id]);
+            }
+        }
+    }
+}