<?php
namespace React\Promise;
function resolve($promiseOrValue = null)
{
if ($promiseOrValue instanceof ExtendedPromiseInterface) {
return $promiseOrValue;
}
// Check is_object() first to avoid method_exists() triggering
// class autoloaders if $promiseOrValue is a string.
if (\is_object($promiseOrValue) && \method_exists($promiseOrValue, 'then')) {
$canceller = null;
if (\method_exists($promiseOrValue, 'cancel')) {
$canceller = [$promiseOrValue, 'cancel'];
}
return new Promise(function ($resolve, $reject, $notify) use ($promiseOrValue) {
$promiseOrValue->then($resolve, $reject, $notify);
}, $canceller);
}
return new FulfilledPromise($promiseOrValue);
}
function reject($promiseOrValue = null)
{
if ($promiseOrValue instanceof PromiseInterface) {
return resolve($promiseOrValue)->then(function ($value) {
return new RejectedPromise($value);
});
}
return new RejectedPromise($promiseOrValue);
}
function all($promisesOrValues)
{
return map($promisesOrValues, function ($val) {
return $val;
});
}
function race($promisesOrValues)
{
$cancellationQueue = new CancellationQueue();
$cancellationQueue->enqueue($promisesOrValues);
return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $cancellationQueue) {
resolve($promisesOrValues)
->done(function ($array) use ($cancellationQueue, $resolve, $reject, $notify) {
if (!is_array($array) || !$array) {
$resolve();
return;
}
foreach ($array as $promiseOrValue) {
$cancellationQueue->enqueue($promiseOrValue);
resolve($promiseOrValue)
->done($resolve, $reject, $notify);
}
}, $reject, $notify);
}, $cancellationQueue);
}
function any($promisesOrValues)
{
return some($promisesOrValues, 1)
->then(function ($val) {
return \array_shift($val);
});
}
function some($promisesOrValues, $howMany)
{
$cancellationQueue = new CancellationQueue();
$cancellationQueue->enqueue($promisesOrValues);
return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $howMany, $cancellationQueue) {
resolve($promisesOrValues)
->done(function ($array) use ($howMany, $cancellationQueue, $resolve, $reject, $notify) {
if (!\is_array($array) || $howMany < 1) {
$resolve([]);
return;
}
$len = \count($array);
if ($len < $howMany) {
throw new Exception\LengthException(
\sprintf(
'Input array must contain at least %d item%s but contains only %s item%s.',
$howMany,
1 === $howMany ? '' : 's',
$len,
1 === $len ? '' : 's'
)
);
}
$toResolve = $howMany;
$toReject = ($len - $toResolve) + 1;
$values = [];
$reasons = [];
foreach ($array as $i => $promiseOrValue) {
$fulfiller = function ($val) use ($i, &$values, &$toResolve, $toReject, $resolve) {
if ($toResolve < 1 || $toReject < 1) {
return;
}
$values[$i] = $val;
if (0 === --$toResolve) {
$resolve($values);
}
};
$rejecter = function ($reason) use ($i, &$reasons, &$toReject, $toResolve, $reject) {
if ($toResolve < 1 || $toReject < 1) {
return;
}
$reasons[$i] = $reason;
if (0 === --$toReject) {
$reject($reasons);
}
};
$cancellationQueue->enqueue($promiseOrValue);
resolve($promiseOrValue)
->done($fulfiller, $rejecter, $notify);
}
}, $reject, $notify);
}, $cancellationQueue);
}
function map($promisesOrValues, callable $mapFunc)
{
$cancellationQueue = new CancellationQueue();
$cancellationQueue->enqueue($promisesOrValues);
return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $mapFunc, $cancellationQueue) {
resolve($promisesOrValues)
->done(function ($array) use ($mapFunc, $cancellationQueue, $resolve, $reject, $notify) {
if (!\is_array($array) || !$array) {
$resolve([]);
return;
}
$toResolve = \count($array);
$values = [];
foreach ($array as $i => $promiseOrValue) {
$cancellationQueue->enqueue($promiseOrValue);
$values[$i] = null;
resolve($promiseOrValue)
->then($mapFunc)
->done(
function ($mapped) use ($i, &$values, &$toResolve, $resolve) {
$values[$i] = $mapped;
if (0 === --$toResolve) {
$resolve($values);
}
},
$reject,
$notify
);
}
}, $reject, $notify);
}, $cancellationQueue);
}
function reduce($promisesOrValues, callable $reduceFunc, $initialValue = null)
{
$cancellationQueue = new CancellationQueue();
$cancellationQueue->enqueue($promisesOrValues);
return new Promise(function ($resolve, $reject, $notify) use ($promisesOrValues, $reduceFunc, $initialValue, $cancellationQueue) {
resolve($promisesOrValues)
->done(function ($array) use ($reduceFunc, $initialValue, $cancellationQueue, $resolve, $reject, $notify) {
if (!\is_array($array)) {
$array = [];
}
$total = \count($array);
$i = 0;
// Wrap the supplied $reduceFunc with one that handles promises and then
// delegates to the supplied.
$wrappedReduceFunc = function ($current, $val) use ($reduceFunc, $cancellationQueue, $total, &$i) {
$cancellationQueue->enqueue($val);
return $current
->then(function ($c) use ($reduceFunc, $total, &$i, $val) {
return resolve($val)
->then(function ($value) use ($reduceFunc, $total, &$i, $c) {
return $reduceFunc($c, $value, $i++, $total);
});
});
};
$cancellationQueue->enqueue($initialValue);
\array_reduce($array, $wrappedReduceFunc, resolve($initialValue))
->done($resolve, $reject, $notify);
}, $reject, $notify);
}, $cancellationQueue);
}
// Internal functions
function _checkTypehint(callable $callback, $object)
{
if (!\is_object($object)) {
return true;
}
if (\is_array($callback)) {
$callbackReflection = new \ReflectionMethod($callback[0], $callback[1]);
} elseif (\is_object($callback) && !$callback instanceof \Closure) {
$callbackReflection = new \ReflectionMethod($callback, '__invoke');
} else {
$callbackReflection = new \ReflectionFunction($callback);
}
$parameters = $callbackReflection->getParameters();
if (!isset($parameters[0])) {
return true;
}
$expectedException = $parameters[0];
if (!$expectedException->getClass()) {
return true;
}
return $expectedException->getClass()->isInstance($object);
}
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