diff options
Diffstat (limited to 'vendor/guzzlehttp/promises/src/Promise.php')
-rw-r--r-- | vendor/guzzlehttp/promises/src/Promise.php | 556 |
1 files changed, 278 insertions, 278 deletions
diff --git a/vendor/guzzlehttp/promises/src/Promise.php b/vendor/guzzlehttp/promises/src/Promise.php index 7593905..3d118c7 100644 --- a/vendor/guzzlehttp/promises/src/Promise.php +++ b/vendor/guzzlehttp/promises/src/Promise.php @@ -1,278 +1,278 @@ -<?php - -namespace GuzzleHttp\Promise; - -/** - * Promises/A+ implementation that avoids recursion when possible. - * - * @link https://promisesaplus.com/ - */ -class Promise implements PromiseInterface -{ - private $state = self::PENDING; - private $result; - private $cancelFn; - private $waitFn; - private $waitList; - private $handlers = []; - - /** - * @param callable $waitFn Fn that when invoked resolves the promise. - * @param callable $cancelFn Fn that when invoked cancels the promise. - */ - public function __construct( - callable $waitFn = null, - callable $cancelFn = null - ) { - $this->waitFn = $waitFn; - $this->cancelFn = $cancelFn; - } - - public function then( - callable $onFulfilled = null, - callable $onRejected = null - ) { - if ($this->state === self::PENDING) { - $p = new Promise(null, [$this, 'cancel']); - $this->handlers[] = [$p, $onFulfilled, $onRejected]; - $p->waitList = $this->waitList; - $p->waitList[] = $this; - return $p; - } - - // Return a fulfilled promise and immediately invoke any callbacks. - if ($this->state === self::FULFILLED) { - $promise = Create::promiseFor($this->result); - return $onFulfilled ? $promise->then($onFulfilled) : $promise; - } - - // It's either cancelled or rejected, so return a rejected promise - // and immediately invoke any callbacks. - $rejection = Create::rejectionFor($this->result); - return $onRejected ? $rejection->then(null, $onRejected) : $rejection; - } - - public function otherwise(callable $onRejected) - { - return $this->then(null, $onRejected); - } - - public function wait($unwrap = true) - { - $this->waitIfPending(); - - if ($this->result instanceof PromiseInterface) { - return $this->result->wait($unwrap); - } - if ($unwrap) { - if ($this->state === self::FULFILLED) { - return $this->result; - } - // It's rejected so "unwrap" and throw an exception. - throw Create::exceptionFor($this->result); - } - } - - public function getState() - { - return $this->state; - } - - public function cancel() - { - if ($this->state !== self::PENDING) { - return; - } - - $this->waitFn = $this->waitList = null; - - if ($this->cancelFn) { - $fn = $this->cancelFn; - $this->cancelFn = null; - try { - $fn(); - } catch (\Throwable $e) { - $this->reject($e); - } catch (\Exception $e) { - $this->reject($e); - } - } - - // Reject the promise only if it wasn't rejected in a then callback. - /** @psalm-suppress RedundantCondition */ - if ($this->state === self::PENDING) { - $this->reject(new CancellationException('Promise has been cancelled')); - } - } - - public function resolve($value) - { - $this->settle(self::FULFILLED, $value); - } - - public function reject($reason) - { - $this->settle(self::REJECTED, $reason); - } - - private function settle($state, $value) - { - if ($this->state !== self::PENDING) { - // Ignore calls with the same resolution. - if ($state === $this->state && $value === $this->result) { - return; - } - throw $this->state === $state - ? new \LogicException("The promise is already {$state}.") - : new \LogicException("Cannot change a {$this->state} promise to {$state}"); - } - - if ($value === $this) { - throw new \LogicException('Cannot fulfill or reject a promise with itself'); - } - - // Clear out the state of the promise but stash the handlers. - $this->state = $state; - $this->result = $value; - $handlers = $this->handlers; - $this->handlers = null; - $this->waitList = $this->waitFn = null; - $this->cancelFn = null; - - if (!$handlers) { - return; - } - - // If the value was not a settled promise or a thenable, then resolve - // it in the task queue using the correct ID. - if (!is_object($value) || !method_exists($value, 'then')) { - $id = $state === self::FULFILLED ? 1 : 2; - // It's a success, so resolve the handlers in the queue. - Utils::queue()->add(static function () use ($id, $value, $handlers) { - foreach ($handlers as $handler) { - self::callHandler($id, $value, $handler); - } - }); - } elseif ($value instanceof Promise && Is::pending($value)) { - // We can just merge our handlers onto the next promise. - $value->handlers = array_merge($value->handlers, $handlers); - } else { - // Resolve the handlers when the forwarded promise is resolved. - $value->then( - static function ($value) use ($handlers) { - foreach ($handlers as $handler) { - self::callHandler(1, $value, $handler); - } - }, - static function ($reason) use ($handlers) { - foreach ($handlers as $handler) { - self::callHandler(2, $reason, $handler); - } - } - ); - } - } - - /** - * Call a stack of handlers using a specific callback index and value. - * - * @param int $index 1 (resolve) or 2 (reject). - * @param mixed $value Value to pass to the callback. - * @param array $handler Array of handler data (promise and callbacks). - */ - private static function callHandler($index, $value, array $handler) - { - /** @var PromiseInterface $promise */ - $promise = $handler[0]; - - // The promise may have been cancelled or resolved before placing - // this thunk in the queue. - if (Is::settled($promise)) { - return; - } - - try { - if (isset($handler[$index])) { - /* - * If $f throws an exception, then $handler will be in the exception - * stack trace. Since $handler contains a reference to the callable - * itself we get a circular reference. We clear the $handler - * here to avoid that memory leak. - */ - $f = $handler[$index]; - unset($handler); - $promise->resolve($f($value)); - } elseif ($index === 1) { - // Forward resolution values as-is. - $promise->resolve($value); - } else { - // Forward rejections down the chain. - $promise->reject($value); - } - } catch (\Throwable $reason) { - $promise->reject($reason); - } catch (\Exception $reason) { - $promise->reject($reason); - } - } - - private function waitIfPending() - { - if ($this->state !== self::PENDING) { - return; - } elseif ($this->waitFn) { - $this->invokeWaitFn(); - } elseif ($this->waitList) { - $this->invokeWaitList(); - } else { - // If there's no wait function, then reject the promise. - $this->reject('Cannot wait on a promise that has ' - . 'no internal wait function. You must provide a wait ' - . 'function when constructing the promise to be able to ' - . 'wait on a promise.'); - } - - Utils::queue()->run(); - - /** @psalm-suppress RedundantCondition */ - if ($this->state === self::PENDING) { - $this->reject('Invoking the wait callback did not resolve the promise'); - } - } - - private function invokeWaitFn() - { - try { - $wfn = $this->waitFn; - $this->waitFn = null; - $wfn(true); - } catch (\Exception $reason) { - if ($this->state === self::PENDING) { - // The promise has not been resolved yet, so reject the promise - // with the exception. - $this->reject($reason); - } else { - // The promise was already resolved, so there's a problem in - // the application. - throw $reason; - } - } - } - - private function invokeWaitList() - { - $waitList = $this->waitList; - $this->waitList = null; - - foreach ($waitList as $result) { - do { - $result->waitIfPending(); - $result = $result->result; - } while ($result instanceof Promise); - - if ($result instanceof PromiseInterface) { - $result->wait(false); - } - } - } -} +<?php
+
+namespace GuzzleHttp\Promise;
+
+/**
+ * Promises/A+ implementation that avoids recursion when possible.
+ *
+ * @link https://promisesaplus.com/
+ */
+class Promise implements PromiseInterface
+{
+ private $state = self::PENDING;
+ private $result;
+ private $cancelFn;
+ private $waitFn;
+ private $waitList;
+ private $handlers = [];
+
+ /**
+ * @param callable $waitFn Fn that when invoked resolves the promise.
+ * @param callable $cancelFn Fn that when invoked cancels the promise.
+ */
+ public function __construct(
+ callable $waitFn = null,
+ callable $cancelFn = null
+ ) {
+ $this->waitFn = $waitFn;
+ $this->cancelFn = $cancelFn;
+ }
+
+ public function then(
+ callable $onFulfilled = null,
+ callable $onRejected = null
+ ) {
+ if ($this->state === self::PENDING) {
+ $p = new Promise(null, [$this, 'cancel']);
+ $this->handlers[] = [$p, $onFulfilled, $onRejected];
+ $p->waitList = $this->waitList;
+ $p->waitList[] = $this;
+ return $p;
+ }
+
+ // Return a fulfilled promise and immediately invoke any callbacks.
+ if ($this->state === self::FULFILLED) {
+ $promise = Create::promiseFor($this->result);
+ return $onFulfilled ? $promise->then($onFulfilled) : $promise;
+ }
+
+ // It's either cancelled or rejected, so return a rejected promise
+ // and immediately invoke any callbacks.
+ $rejection = Create::rejectionFor($this->result);
+ return $onRejected ? $rejection->then(null, $onRejected) : $rejection;
+ }
+
+ public function otherwise(callable $onRejected)
+ {
+ return $this->then(null, $onRejected);
+ }
+
+ public function wait($unwrap = true)
+ {
+ $this->waitIfPending();
+
+ if ($this->result instanceof PromiseInterface) {
+ return $this->result->wait($unwrap);
+ }
+ if ($unwrap) {
+ if ($this->state === self::FULFILLED) {
+ return $this->result;
+ }
+ // It's rejected so "unwrap" and throw an exception.
+ throw Create::exceptionFor($this->result);
+ }
+ }
+
+ public function getState()
+ {
+ return $this->state;
+ }
+
+ public function cancel()
+ {
+ if ($this->state !== self::PENDING) {
+ return;
+ }
+
+ $this->waitFn = $this->waitList = null;
+
+ if ($this->cancelFn) {
+ $fn = $this->cancelFn;
+ $this->cancelFn = null;
+ try {
+ $fn();
+ } catch (\Throwable $e) {
+ $this->reject($e);
+ } catch (\Exception $e) {
+ $this->reject($e);
+ }
+ }
+
+ // Reject the promise only if it wasn't rejected in a then callback.
+ /** @psalm-suppress RedundantCondition */
+ if ($this->state === self::PENDING) {
+ $this->reject(new CancellationException('Promise has been cancelled'));
+ }
+ }
+
+ public function resolve($value)
+ {
+ $this->settle(self::FULFILLED, $value);
+ }
+
+ public function reject($reason)
+ {
+ $this->settle(self::REJECTED, $reason);
+ }
+
+ private function settle($state, $value)
+ {
+ if ($this->state !== self::PENDING) {
+ // Ignore calls with the same resolution.
+ if ($state === $this->state && $value === $this->result) {
+ return;
+ }
+ throw $this->state === $state
+ ? new \LogicException("The promise is already {$state}.")
+ : new \LogicException("Cannot change a {$this->state} promise to {$state}");
+ }
+
+ if ($value === $this) {
+ throw new \LogicException('Cannot fulfill or reject a promise with itself');
+ }
+
+ // Clear out the state of the promise but stash the handlers.
+ $this->state = $state;
+ $this->result = $value;
+ $handlers = $this->handlers;
+ $this->handlers = null;
+ $this->waitList = $this->waitFn = null;
+ $this->cancelFn = null;
+
+ if (!$handlers) {
+ return;
+ }
+
+ // If the value was not a settled promise or a thenable, then resolve
+ // it in the task queue using the correct ID.
+ if (!is_object($value) || !method_exists($value, 'then')) {
+ $id = $state === self::FULFILLED ? 1 : 2;
+ // It's a success, so resolve the handlers in the queue.
+ Utils::queue()->add(static function () use ($id, $value, $handlers) {
+ foreach ($handlers as $handler) {
+ self::callHandler($id, $value, $handler);
+ }
+ });
+ } elseif ($value instanceof Promise && Is::pending($value)) {
+ // We can just merge our handlers onto the next promise.
+ $value->handlers = array_merge($value->handlers, $handlers);
+ } else {
+ // Resolve the handlers when the forwarded promise is resolved.
+ $value->then(
+ static function ($value) use ($handlers) {
+ foreach ($handlers as $handler) {
+ self::callHandler(1, $value, $handler);
+ }
+ },
+ static function ($reason) use ($handlers) {
+ foreach ($handlers as $handler) {
+ self::callHandler(2, $reason, $handler);
+ }
+ }
+ );
+ }
+ }
+
+ /**
+ * Call a stack of handlers using a specific callback index and value.
+ *
+ * @param int $index 1 (resolve) or 2 (reject).
+ * @param mixed $value Value to pass to the callback.
+ * @param array $handler Array of handler data (promise and callbacks).
+ */
+ private static function callHandler($index, $value, array $handler)
+ {
+ /** @var PromiseInterface $promise */
+ $promise = $handler[0];
+
+ // The promise may have been cancelled or resolved before placing
+ // this thunk in the queue.
+ if (Is::settled($promise)) {
+ return;
+ }
+
+ try {
+ if (isset($handler[$index])) {
+ /*
+ * If $f throws an exception, then $handler will be in the exception
+ * stack trace. Since $handler contains a reference to the callable
+ * itself we get a circular reference. We clear the $handler
+ * here to avoid that memory leak.
+ */
+ $f = $handler[$index];
+ unset($handler);
+ $promise->resolve($f($value));
+ } elseif ($index === 1) {
+ // Forward resolution values as-is.
+ $promise->resolve($value);
+ } else {
+ // Forward rejections down the chain.
+ $promise->reject($value);
+ }
+ } catch (\Throwable $reason) {
+ $promise->reject($reason);
+ } catch (\Exception $reason) {
+ $promise->reject($reason);
+ }
+ }
+
+ private function waitIfPending()
+ {
+ if ($this->state !== self::PENDING) {
+ return;
+ } elseif ($this->waitFn) {
+ $this->invokeWaitFn();
+ } elseif ($this->waitList) {
+ $this->invokeWaitList();
+ } else {
+ // If there's no wait function, then reject the promise.
+ $this->reject('Cannot wait on a promise that has '
+ . 'no internal wait function. You must provide a wait '
+ . 'function when constructing the promise to be able to '
+ . 'wait on a promise.');
+ }
+
+ Utils::queue()->run();
+
+ /** @psalm-suppress RedundantCondition */
+ if ($this->state === self::PENDING) {
+ $this->reject('Invoking the wait callback did not resolve the promise');
+ }
+ }
+
+ private function invokeWaitFn()
+ {
+ try {
+ $wfn = $this->waitFn;
+ $this->waitFn = null;
+ $wfn(true);
+ } catch (\Exception $reason) {
+ if ($this->state === self::PENDING) {
+ // The promise has not been resolved yet, so reject the promise
+ // with the exception.
+ $this->reject($reason);
+ } else {
+ // The promise was already resolved, so there's a problem in
+ // the application.
+ throw $reason;
+ }
+ }
+ }
+
+ private function invokeWaitList()
+ {
+ $waitList = $this->waitList;
+ $this->waitList = null;
+
+ foreach ($waitList as $result) {
+ do {
+ $result->waitIfPending();
+ $result = $result->result;
+ } while ($result instanceof Promise);
+
+ if ($result instanceof PromiseInterface) {
+ $result->wait(false);
+ }
+ }
+ }
+}
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