--- /dev/null
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Get the global task queue used for promise resolution.
+ *
+ * This task queue MUST be run in an event loop in order for promises to be
+ * settled asynchronously. It will be automatically run when synchronously
+ * waiting on a promise.
+ *
+ * <code>
+ * while ($eventLoop->isRunning()) {
+ * GuzzleHttp\Promise\queue()->run();
+ * }
+ * </code>
+ *
+ * @param TaskQueueInterface $assign Optionally specify a new queue instance.
+ *
+ * @return TaskQueueInterface
+ */
+function queue(TaskQueueInterface $assign = null)
+{
+ static $queue;
+
+ if ($assign) {
+ $queue = $assign;
+ } elseif (!$queue) {
+ $queue = new TaskQueue();
+ }
+
+ return $queue;
+}
+
+/**
+ * Adds a function to run in the task queue when it is next `run()` and returns
+ * a promise that is fulfilled or rejected with the result.
+ *
+ * @param callable $task Task function to run.
+ *
+ * @return PromiseInterface
+ */
+function task(callable $task)
+{
+ $queue = queue();
+ $promise = new Promise([$queue, 'run']);
+ $queue->add(function () use ($task, $promise) {
+ try {
+ $promise->resolve($task());
+ } catch (\Throwable $e) {
+ $promise->reject($e);
+ } catch (\Exception $e) {
+ $promise->reject($e);
+ }
+ });
+
+ return $promise;
+}
+
+/**
+ * Creates a promise for a value if the value is not a promise.
+ *
+ * @param mixed $value Promise or value.
+ *
+ * @return PromiseInterface
+ */
+function promise_for($value)
+{
+ if ($value instanceof PromiseInterface) {
+ return $value;
+ }
+
+ // Return a Guzzle promise that shadows the given promise.
+ if (method_exists($value, 'then')) {
+ $wfn = method_exists($value, 'wait') ? [$value, 'wait'] : null;
+ $cfn = method_exists($value, 'cancel') ? [$value, 'cancel'] : null;
+ $promise = new Promise($wfn, $cfn);
+ $value->then([$promise, 'resolve'], [$promise, 'reject']);
+ return $promise;
+ }
+
+ return new FulfilledPromise($value);
+}
+
+/**
+ * Creates a rejected promise for a reason if the reason is not a promise. If
+ * the provided reason is a promise, then it is returned as-is.
+ *
+ * @param mixed $reason Promise or reason.
+ *
+ * @return PromiseInterface
+ */
+function rejection_for($reason)
+{
+ if ($reason instanceof PromiseInterface) {
+ return $reason;
+ }
+
+ return new RejectedPromise($reason);
+}
+
+/**
+ * Create an exception for a rejected promise value.
+ *
+ * @param mixed $reason
+ *
+ * @return \Exception|\Throwable
+ */
+function exception_for($reason)
+{
+ return $reason instanceof \Exception || $reason instanceof \Throwable
+ ? $reason
+ : new RejectionException($reason);
+}
+
+/**
+ * Returns an iterator for the given value.
+ *
+ * @param mixed $value
+ *
+ * @return \Iterator
+ */
+function iter_for($value)
+{
+ if ($value instanceof \Iterator) {
+ return $value;
+ } elseif (is_array($value)) {
+ return new \ArrayIterator($value);
+ } else {
+ return new \ArrayIterator([$value]);
+ }
+}
+
+/**
+ * Synchronously waits on a promise to resolve and returns an inspection state
+ * array.
+ *
+ * Returns a state associative array containing a "state" key mapping to a
+ * valid promise state. If the state of the promise is "fulfilled", the array
+ * will contain a "value" key mapping to the fulfilled value of the promise. If
+ * the promise is rejected, the array will contain a "reason" key mapping to
+ * the rejection reason of the promise.
+ *
+ * @param PromiseInterface $promise Promise or value.
+ *
+ * @return array
+ */
+function inspect(PromiseInterface $promise)
+{
+ try {
+ return [
+ 'state' => PromiseInterface::FULFILLED,
+ 'value' => $promise->wait()
+ ];
+ } catch (RejectionException $e) {
+ return ['state' => PromiseInterface::REJECTED, 'reason' => $e->getReason()];
+ } catch (\Throwable $e) {
+ return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+ } catch (\Exception $e) {
+ return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+ }
+}
+
+/**
+ * Waits on all of the provided promises, but does not unwrap rejected promises
+ * as thrown exception.
+ *
+ * Returns an array of inspection state arrays.
+ *
+ * @param PromiseInterface[] $promises Traversable of promises to wait upon.
+ *
+ * @return array
+ * @see GuzzleHttp\Promise\inspect for the inspection state array format.
+ */
+function inspect_all($promises)
+{
+ $results = [];
+ foreach ($promises as $key => $promise) {
+ $results[$key] = inspect($promise);
+ }
+
+ return $results;
+}
+
+/**
+ * Waits on all of the provided promises and returns the fulfilled values.
+ *
+ * Returns an array that contains the value of each promise (in the same order
+ * the promises were provided). An exception is thrown if any of the promises
+ * are rejected.
+ *
+ * @param mixed $promises Iterable of PromiseInterface objects to wait on.
+ *
+ * @return array
+ * @throws \Exception on error
+ * @throws \Throwable on error in PHP >=7
+ */
+function unwrap($promises)
+{
+ $results = [];
+ foreach ($promises as $key => $promise) {
+ $results[$key] = $promise->wait();
+ }
+
+ return $results;
+}
+
+/**
+ * Given an array of promises, return a promise that is fulfilled when all the
+ * items in the array are fulfilled.
+ *
+ * The promise's fulfillment value is an array with fulfillment values at
+ * respective positions to the original array. If any promise in the array
+ * rejects, the returned promise is rejected with the rejection reason.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function all($promises)
+{
+ $results = [];
+ return each(
+ $promises,
+ function ($value, $idx) use (&$results) {
+ $results[$idx] = $value;
+ },
+ function ($reason, $idx, Promise $aggregate) {
+ $aggregate->reject($reason);
+ }
+ )->then(function () use (&$results) {
+ ksort($results);
+ return $results;
+ });
+}
+
+/**
+ * Initiate a competitive race between multiple promises or values (values will
+ * become immediately fulfilled promises).
+ *
+ * When count amount of promises have been fulfilled, the returned promise is
+ * fulfilled with an array that contains the fulfillment values of the winners
+ * in order of resolution.
+ *
+ * This prommise is rejected with a {@see GuzzleHttp\Promise\AggregateException}
+ * if the number of fulfilled promises is less than the desired $count.
+ *
+ * @param int $count Total number of promises.
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function some($count, $promises)
+{
+ $results = [];
+ $rejections = [];
+
+ return each(
+ $promises,
+ function ($value, $idx, PromiseInterface $p) use (&$results, $count) {
+ if ($p->getState() !== PromiseInterface::PENDING) {
+ return;
+ }
+ $results[$idx] = $value;
+ if (count($results) >= $count) {
+ $p->resolve(null);
+ }
+ },
+ function ($reason) use (&$rejections) {
+ $rejections[] = $reason;
+ }
+ )->then(
+ function () use (&$results, &$rejections, $count) {
+ if (count($results) !== $count) {
+ throw new AggregateException(
+ 'Not enough promises to fulfill count',
+ $rejections
+ );
+ }
+ ksort($results);
+ return array_values($results);
+ }
+ );
+}
+
+/**
+ * Like some(), with 1 as count. However, if the promise fulfills, the
+ * fulfillment value is not an array of 1 but the value directly.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function any($promises)
+{
+ return some(1, $promises)->then(function ($values) { return $values[0]; });
+}
+
+/**
+ * Returns a promise that is fulfilled when all of the provided promises have
+ * been fulfilled or rejected.
+ *
+ * The returned promise is fulfilled with an array of inspection state arrays.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ * @see GuzzleHttp\Promise\inspect for the inspection state array format.
+ */
+function settle($promises)
+{
+ $results = [];
+
+ return each(
+ $promises,
+ function ($value, $idx) use (&$results) {
+ $results[$idx] = ['state' => PromiseInterface::FULFILLED, 'value' => $value];
+ },
+ function ($reason, $idx) use (&$results) {
+ $results[$idx] = ['state' => PromiseInterface::REJECTED, 'reason' => $reason];
+ }
+ )->then(function () use (&$results) {
+ ksort($results);
+ return $results;
+ });
+}
+
+/**
+ * Given an iterator that yields promises or values, returns a promise that is
+ * fulfilled with a null value when the iterator has been consumed or the
+ * aggregate promise has been fulfilled or rejected.
+ *
+ * $onFulfilled is a function that accepts the fulfilled value, iterator
+ * index, and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate promise if needed.
+ *
+ * $onRejected is a function that accepts the rejection reason, iterator
+ * index, and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate promise if needed.
+ *
+ * @param mixed $iterable Iterator or array to iterate over.
+ * @param callable $onFulfilled
+ * @param callable $onRejected
+ *
+ * @return PromiseInterface
+ */
+function each(
+ $iterable,
+ callable $onFulfilled = null,
+ callable $onRejected = null
+) {
+ return (new EachPromise($iterable, [
+ 'fulfilled' => $onFulfilled,
+ 'rejected' => $onRejected
+ ]))->promise();
+}
+
+/**
+ * Like each, but only allows a certain number of outstanding promises at any
+ * given time.
+ *
+ * $concurrency may be an integer or a function that accepts the number of
+ * pending promises and returns a numeric concurrency limit value to allow for
+ * dynamic a concurrency size.
+ *
+ * @param mixed $iterable
+ * @param int|callable $concurrency
+ * @param callable $onFulfilled
+ * @param callable $onRejected
+ *
+ * @return PromiseInterface
+ */
+function each_limit(
+ $iterable,
+ $concurrency,
+ callable $onFulfilled = null,
+ callable $onRejected = null
+) {
+ return (new EachPromise($iterable, [
+ 'fulfilled' => $onFulfilled,
+ 'rejected' => $onRejected,
+ 'concurrency' => $concurrency
+ ]))->promise();
+}
+
+/**
+ * Like each_limit, but ensures that no promise in the given $iterable argument
+ * is rejected. If any promise is rejected, then the aggregate promise is
+ * rejected with the encountered rejection.
+ *
+ * @param mixed $iterable
+ * @param int|callable $concurrency
+ * @param callable $onFulfilled
+ *
+ * @return PromiseInterface
+ */
+function each_limit_all(
+ $iterable,
+ $concurrency,
+ callable $onFulfilled = null
+) {
+ return each_limit(
+ $iterable,
+ $concurrency,
+ $onFulfilled,
+ function ($reason, $idx, PromiseInterface $aggregate) {
+ $aggregate->reject($reason);
+ }
+ );
+}
+
+/**
+ * Returns true if a promise is fulfilled.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_fulfilled(PromiseInterface $promise)
+{
+ return $promise->getState() === PromiseInterface::FULFILLED;
+}
+
+/**
+ * Returns true if a promise is rejected.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_rejected(PromiseInterface $promise)
+{
+ return $promise->getState() === PromiseInterface::REJECTED;
+}
+
+/**
+ * Returns true if a promise is fulfilled or rejected.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_settled(PromiseInterface $promise)
+{
+ return $promise->getState() !== PromiseInterface::PENDING;
+}
+
+/**
+ * @see Coroutine
+ *
+ * @param callable $generatorFn
+ *
+ * @return PromiseInterface
+ */
+function coroutine(callable $generatorFn)
+{
+ return new Coroutine($generatorFn);
+}
projects / yaffs-website / blobdiff