1 files changed, 52 insertions, 0 deletions
diff --git a/vendor/open-telemetry/sdk/Common/Util/functions.php b/vendor/open-telemetry/sdk/Common/Util/functions.php
new file mode 100644
index 000000000..f4fb13b80
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Util/functions.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Util;
+
+use Closure;
+use function get_class;
+use ReflectionFunction;
+use stdClass;
+use WeakReference;
+
+/**
+ * @internal
+ */
+function closure(callable $callable): Closure
+{
+    return Closure::fromCallable($callable);
+}
+
+/**
+ * @internal
+ * @see https://github.com/amphp/amp/blob/f682341c856b1f688026f787bef4f77eaa5c7970/src/functions.php#L140-L191
+ */
+function weaken(Closure $closure, ?object &$target = null): Closure
+{
+    $reflection = new ReflectionFunction($closure);
+    if (!$target = $reflection->getClosureThis()) {
+        return $closure;
+    }
+
+    $scope = $reflection->getClosureScopeClass();
+    $name = $reflection->getShortName();
+    if ($name !== '{closure}') {
+        /** @psalm-suppress InvalidScope @phpstan-ignore-next-line @phan-suppress-next-line PhanUndeclaredThis */
+        $closure = fn (...$args) => $this->$name(...$args);
+        if ($scope !== null) {
+            $closure = $closure->bindTo(null, $scope->name);
+        }
+    }
+
+    static $placeholder;
+    $placeholder ??= new stdClass();
+    $closure = $closure->bindTo($placeholder);
+
+    $ref = WeakReference::create($target);
+
+    /** @psalm-suppress PossiblyInvalidFunctionCall */
+    return $scope && get_class($target) === $scope->name && !$scope->isInternal()
+        ? static fn (...$args) => ($obj = $ref->get()) ? $closure->call($obj, ...$args) : null
+        : static fn (...$args) => ($obj = $ref->get()) ? $closure->bindTo($obj)(...$args) : null;
+}