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<pre class="code"><code><span id="1" class="l"><span class="xlang"><?php</span>
</span><span id="2" class="l"><span class="php-keyword1">namespace</span> GuzzleHttp\Promise;
</span><span id="3" class="l">
</span><span id="4" class="l"><span class="php-comment">/**
</span></span><span id="5" class="l"><span class="php-comment"> * Promises/A+ implementation that avoids recursion when possible.
</span></span><span id="6" class="l"><span class="php-comment"> *
</span></span><span id="7" class="l"><span class="php-comment"> * @link https://promisesaplus.com/
</span></span><span id="8" class="l"><span class="php-comment"> */</span>
</span><span id="9" class="l"><span class="php-keyword1">class</span> Promise <span class="php-keyword1">implements</span> PromiseInterface
</span><span id="10" class="l">{
</span><span id="11" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$state</span> = self::PENDING;
</span><span id="12" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$result</span>;
</span><span id="13" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$cancelFn</span>;
</span><span id="14" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$waitFn</span>;
</span><span id="15" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$waitList</span>;
</span><span id="16" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$handlers</span> = [];
</span><span id="17" class="l">
</span><span id="18" class="l"> <span class="php-comment">/**
</span></span><span id="19" class="l"><span class="php-comment"> * @param callable $waitFn Fn that when invoked resolves the promise.
</span></span><span id="20" class="l"><span class="php-comment"> * @param callable $cancelFn Fn that when invoked cancels the promise.
</span></span><span id="21" class="l"><span class="php-comment"> */</span>
</span><span id="22" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(
</span><span id="23" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$waitFn</span> = <span class="php-keyword1">null</span>,
</span><span id="24" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$cancelFn</span> = <span class="php-keyword1">null</span>
</span><span id="25" class="l"> ) {
</span><span id="26" class="l"> <span class="php-var">$this</span>->waitFn = <span class="php-var">$waitFn</span>;
</span><span id="27" class="l"> <span class="php-var">$this</span>->cancelFn = <span class="php-var">$cancelFn</span>;
</span><span id="28" class="l"> }
</span><span id="29" class="l">
</span><span id="30" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> then(
</span><span id="31" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$onFulfilled</span> = <span class="php-keyword1">null</span>,
</span><span id="32" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$onRejected</span> = <span class="php-keyword1">null</span>
</span><span id="33" class="l"> ) {
</span><span id="34" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state === self::PENDING) {
</span><span id="35" class="l"> <span class="php-var">$p</span> = <span class="php-keyword1">new</span> Promise(<span class="php-keyword1">null</span>, [<span class="php-var">$this</span>, <span class="php-quote">'cancel'</span>]);
</span><span id="36" class="l"> <span class="php-var">$this</span>->handlers[] = [<span class="php-var">$p</span>, <span class="php-var">$onFulfilled</span>, <span class="php-var">$onRejected</span>];
</span><span id="37" class="l"> <span class="php-var">$p</span>->waitList = <span class="php-var">$this</span>->waitList;
</span><span id="38" class="l"> <span class="php-var">$p</span>->waitList[] = <span class="php-var">$this</span>;
</span><span id="39" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$p</span>;
</span><span id="40" class="l"> }
</span><span id="41" class="l">
</span><span id="42" class="l"> <span class="php-comment">// Return a fulfilled promise and immediately invoke any callbacks.</span>
</span><span id="43" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state === self::FULFILLED) {
</span><span id="44" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$onFulfilled</span>
</span><span id="45" class="l"> ? promise_for(<span class="php-var">$this</span>->result)->then(<span class="php-var">$onFulfilled</span>)
</span><span id="46" class="l"> : promise_for(<span class="php-var">$this</span>->result);
</span><span id="47" class="l"> }
</span><span id="48" class="l">
</span><span id="49" class="l"> <span class="php-comment">// It's either cancelled or rejected, so return a rejected promise</span>
</span><span id="50" class="l"> <span class="php-comment">// and immediately invoke any callbacks.</span>
</span><span id="51" class="l"> <span class="php-var">$rejection</span> = rejection_for(<span class="php-var">$this</span>->result);
</span><span id="52" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$onRejected</span> ? <span class="php-var">$rejection</span>->then(<span class="php-keyword1">null</span>, <span class="php-var">$onRejected</span>) : <span class="php-var">$rejection</span>;
</span><span id="53" class="l"> }
</span><span id="54" class="l">
</span><span id="55" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> otherwise(<span class="php-keyword1">callable</span> <span class="php-var">$onRejected</span>)
</span><span id="56" class="l"> {
</span><span id="57" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->then(<span class="php-keyword1">null</span>, <span class="php-var">$onRejected</span>);
</span><span id="58" class="l"> }
</span><span id="59" class="l">
</span><span id="60" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> wait(<span class="php-var">$unwrap</span> = <span class="php-keyword1">true</span>)
</span><span id="61" class="l"> {
</span><span id="62" class="l"> <span class="php-var">$this</span>->waitIfPending();
</span><span id="63" class="l">
</span><span id="64" class="l"> <span class="php-var">$inner</span> = <span class="php-var">$this</span>->result <span class="php-keyword1">instanceof</span> PromiseInterface
</span><span id="65" class="l"> ? <span class="php-var">$this</span>->result->wait(<span class="php-var">$unwrap</span>)
</span><span id="66" class="l"> : <span class="php-var">$this</span>->result;
</span><span id="67" class="l">
</span><span id="68" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$unwrap</span>) {
</span><span id="69" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->result <span class="php-keyword1">instanceof</span> PromiseInterface
</span><span id="70" class="l"> || <span class="php-var">$this</span>->state === self::FULFILLED
</span><span id="71" class="l"> ) {
</span><span id="72" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$inner</span>;
</span><span id="73" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="74" class="l"> <span class="php-comment">// It's rejected so "unwrap" and throw an exception.</span>
</span><span id="75" class="l"> <span class="php-keyword1">throw</span> exception_for(<span class="php-var">$inner</span>);
</span><span id="76" class="l"> }
</span><span id="77" class="l"> }
</span><span id="78" class="l"> }
</span><span id="79" class="l">
</span><span id="80" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getState()
</span><span id="81" class="l"> {
</span><span id="82" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->state;
</span><span id="83" class="l"> }
</span><span id="84" class="l">
</span><span id="85" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> cancel()
</span><span id="86" class="l"> {
</span><span id="87" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state !== self::PENDING) {
</span><span id="88" class="l"> <span class="php-keyword1">return</span>;
</span><span id="89" class="l"> }
</span><span id="90" class="l">
</span><span id="91" class="l"> <span class="php-var">$this</span>->waitFn = <span class="php-var">$this</span>->waitList = <span class="php-keyword1">null</span>;
</span><span id="92" class="l">
</span><span id="93" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->cancelFn) {
</span><span id="94" class="l"> <span class="php-var">$fn</span> = <span class="php-var">$this</span>->cancelFn;
</span><span id="95" class="l"> <span class="php-var">$this</span>->cancelFn = <span class="php-keyword1">null</span>;
</span><span id="96" class="l"> <span class="php-keyword1">try</span> {
</span><span id="97" class="l"> <span class="php-var">$fn</span>();
</span><span id="98" class="l"> } <span class="php-keyword1">catch</span> (\Throwable <span class="php-var">$e</span>) {
</span><span id="99" class="l"> <span class="php-var">$this</span>->reject(<span class="php-var">$e</span>);
</span><span id="100" class="l"> } <span class="php-keyword1">catch</span> (\Exception <span class="php-var">$e</span>) {
</span><span id="101" class="l"> <span class="php-var">$this</span>->reject(<span class="php-var">$e</span>);
</span><span id="102" class="l"> }
</span><span id="103" class="l"> }
</span><span id="104" class="l">
</span><span id="105" class="l"> <span class="php-comment">// Reject the promise only if it wasn't rejected in a then callback.</span>
</span><span id="106" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state === self::PENDING) {
</span><span id="107" class="l"> <span class="php-var">$this</span>->reject(<span class="php-keyword1">new</span> CancellationException(<span class="php-quote">'Promise has been cancelled'</span>));
</span><span id="108" class="l"> }
</span><span id="109" class="l"> }
</span><span id="110" class="l">
</span><span id="111" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> resolve(<span class="php-var">$value</span>)
</span><span id="112" class="l"> {
</span><span id="113" class="l"> <span class="php-var">$this</span>->settle(self::FULFILLED, <span class="php-var">$value</span>);
</span><span id="114" class="l"> }
</span><span id="115" class="l">
</span><span id="116" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> reject(<span class="php-var">$reason</span>)
</span><span id="117" class="l"> {
</span><span id="118" class="l"> <span class="php-var">$this</span>->settle(self::REJECTED, <span class="php-var">$reason</span>);
</span><span id="119" class="l"> }
</span><span id="120" class="l">
</span><span id="121" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> settle(<span class="php-var">$state</span>, <span class="php-var">$value</span>)
</span><span id="122" class="l"> {
</span><span id="123" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state !== self::PENDING) {
</span><span id="124" class="l"> <span class="php-comment">// Ignore calls with the same resolution.</span>
</span><span id="125" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$state</span> === <span class="php-var">$this</span>->state && <span class="php-var">$value</span> === <span class="php-var">$this</span>->result) {
</span><span id="126" class="l"> <span class="php-keyword1">return</span>;
</span><span id="127" class="l"> }
</span><span id="128" class="l"> <span class="php-keyword1">throw</span> <span class="php-var">$this</span>->state === <span class="php-var">$state</span>
</span><span id="129" class="l"> ? <span class="php-keyword1">new</span> \LogicException(<span class="php-quote">"The promise is already </span><span class="php-var">{$state}</span><span class="php-quote">."</span>)
</span><span id="130" class="l"> : <span class="php-keyword1">new</span> \LogicException(<span class="php-quote">"Cannot change a </span><span class="php-var">{$this->state}</span><span class="php-quote"> promise to </span><span class="php-var">{$state}</span><span class="php-quote">"</span>);
</span><span id="131" class="l"> }
</span><span id="132" class="l">
</span><span id="133" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$value</span> === <span class="php-var">$this</span>) {
</span><span id="134" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> \LogicException(<span class="php-quote">'Cannot fulfill or reject a promise with itself'</span>);
</span><span id="135" class="l"> }
</span><span id="136" class="l">
</span><span id="137" class="l"> <span class="php-comment">// Clear out the state of the promise but stash the handlers.</span>
</span><span id="138" class="l"> <span class="php-var">$this</span>->state = <span class="php-var">$state</span>;
</span><span id="139" class="l"> <span class="php-var">$this</span>->result = <span class="php-var">$value</span>;
</span><span id="140" class="l"> <span class="php-var">$handlers</span> = <span class="php-var">$this</span>->handlers;
</span><span id="141" class="l"> <span class="php-var">$this</span>->handlers = <span class="php-keyword1">null</span>;
</span><span id="142" class="l"> <span class="php-var">$this</span>->waitList = <span class="php-var">$this</span>->waitFn = <span class="php-keyword1">null</span>;
</span><span id="143" class="l"> <span class="php-var">$this</span>->cancelFn = <span class="php-keyword1">null</span>;
</span><span id="144" class="l">
</span><span id="145" class="l"> <span class="php-keyword1">if</span> (!<span class="php-var">$handlers</span>) {
</span><span id="146" class="l"> <span class="php-keyword1">return</span>;
</span><span id="147" class="l"> }
</span><span id="148" class="l">
</span><span id="149" class="l"> <span class="php-comment">// If the value was not a settled promise or a thenable, then resolve</span>
</span><span id="150" class="l"> <span class="php-comment">// it in the task queue using the correct ID.</span>
</span><span id="151" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">method_exists</span>(<span class="php-var">$value</span>, <span class="php-quote">'then'</span>)) {
</span><span id="152" class="l"> <span class="php-var">$id</span> = <span class="php-var">$state</span> === self::FULFILLED ? <span class="php-num">1</span> : <span class="php-num">2</span>;
</span><span id="153" class="l"> <span class="php-comment">// It's a success, so resolve the handlers in the queue.</span>
</span><span id="154" class="l"> queue()->add(<span class="php-keyword1">static</span> <span class="php-keyword1">function</span> () <span class="php-keyword1">use</span> (<span class="php-var">$id</span>, <span class="php-var">$value</span>, <span class="php-var">$handlers</span>) {
</span><span id="155" class="l"> <span class="php-keyword1">foreach</span> (<span class="php-var">$handlers</span> <span class="php-keyword1">as</span> <span class="php-var">$handler</span>) {
</span><span id="156" class="l"> self::callHandler(<span class="php-var">$id</span>, <span class="php-var">$value</span>, <span class="php-var">$handler</span>);
</span><span id="157" class="l"> }
</span><span id="158" class="l"> });
</span><span id="159" class="l"> } <span class="php-keyword1">elseif</span> (<span class="php-var">$value</span> <span class="php-keyword1">instanceof</span> Promise
</span><span id="160" class="l"> && <span class="php-var">$value</span>->getState() === self::PENDING
</span><span id="161" class="l"> ) {
</span><span id="162" class="l"> <span class="php-comment">// We can just merge our handlers onto the next promise.</span>
</span><span id="163" class="l"> <span class="php-var">$value</span>->handlers = <span class="php-keyword2">array_merge</span>(<span class="php-var">$value</span>->handlers, <span class="php-var">$handlers</span>);
</span><span id="164" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="165" class="l"> <span class="php-comment">// Resolve the handlers when the forwarded promise is resolved.</span>
</span><span id="166" class="l"> <span class="php-var">$value</span>->then(
</span><span id="167" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">function</span> (<span class="php-var">$value</span>) <span class="php-keyword1">use</span> (<span class="php-var">$handlers</span>) {
</span><span id="168" class="l"> <span class="php-keyword1">foreach</span> (<span class="php-var">$handlers</span> <span class="php-keyword1">as</span> <span class="php-var">$handler</span>) {
</span><span id="169" class="l"> self::callHandler(<span class="php-num">1</span>, <span class="php-var">$value</span>, <span class="php-var">$handler</span>);
</span><span id="170" class="l"> }
</span><span id="171" class="l"> },
</span><span id="172" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">function</span> (<span class="php-var">$reason</span>) <span class="php-keyword1">use</span> (<span class="php-var">$handlers</span>) {
</span><span id="173" class="l"> <span class="php-keyword1">foreach</span> (<span class="php-var">$handlers</span> <span class="php-keyword1">as</span> <span class="php-var">$handler</span>) {
</span><span id="174" class="l"> self::callHandler(<span class="php-num">2</span>, <span class="php-var">$reason</span>, <span class="php-var">$handler</span>);
</span><span id="175" class="l"> }
</span><span id="176" class="l"> }
</span><span id="177" class="l"> );
</span><span id="178" class="l"> }
</span><span id="179" class="l"> }
</span><span id="180" class="l">
</span><span id="181" class="l"> <span class="php-comment">/**
</span></span><span id="182" class="l"><span class="php-comment"> * Call a stack of handlers using a specific callback index and value.
</span></span><span id="183" class="l"><span class="php-comment"> *
</span></span><span id="184" class="l"><span class="php-comment"> * @param int $index 1 (resolve) or 2 (reject).
</span></span><span id="185" class="l"><span class="php-comment"> * @param mixed $value Value to pass to the callback.
</span></span><span id="186" class="l"><span class="php-comment"> * @param array $handler Array of handler data (promise and callbacks).
</span></span><span id="187" class="l"><span class="php-comment"> *
</span></span><span id="188" class="l"><span class="php-comment"> * @return array Returns the next group to resolve.
</span></span><span id="189" class="l"><span class="php-comment"> */</span>
</span><span id="190" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">static</span> <span class="php-keyword1">function</span> callHandler(<span class="php-var">$index</span>, <span class="php-var">$value</span>, <span class="php-keyword1">array</span> <span class="php-var">$handler</span>)
</span><span id="191" class="l"> {
</span><span id="192" class="l"> <span class="php-comment">/** @var PromiseInterface $promise */</span>
</span><span id="193" class="l"> <span class="php-var">$promise</span> = <span class="php-var">$handler</span>[<span class="php-num">0</span>];
</span><span id="194" class="l">
</span><span id="195" class="l"> <span class="php-comment">// The promise may have been cancelled or resolved before placing</span>
</span><span id="196" class="l"> <span class="php-comment">// this thunk in the queue.</span>
</span><span id="197" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$promise</span>->getState() !== self::PENDING) {
</span><span id="198" class="l"> <span class="php-keyword1">return</span>;
</span><span id="199" class="l"> }
</span><span id="200" class="l">
</span><span id="201" class="l"> <span class="php-keyword1">try</span> {
</span><span id="202" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">isset</span>(<span class="php-var">$handler</span>[<span class="php-var">$index</span>])) {
</span><span id="203" class="l"> <span class="php-var">$promise</span>->resolve(<span class="php-var">$handler</span>[<span class="php-var">$index</span>](<span class="php-var">$value</span>));
</span><span id="204" class="l"> } <span class="php-keyword1">elseif</span> (<span class="php-var">$index</span> === <span class="php-num">1</span>) {
</span><span id="205" class="l"> <span class="php-comment">// Forward resolution values as-is.</span>
</span><span id="206" class="l"> <span class="php-var">$promise</span>->resolve(<span class="php-var">$value</span>);
</span><span id="207" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="208" class="l"> <span class="php-comment">// Forward rejections down the chain.</span>
</span><span id="209" class="l"> <span class="php-var">$promise</span>->reject(<span class="php-var">$value</span>);
</span><span id="210" class="l"> }
</span><span id="211" class="l"> } <span class="php-keyword1">catch</span> (\Throwable <span class="php-var">$reason</span>) {
</span><span id="212" class="l"> <span class="php-var">$promise</span>->reject(<span class="php-var">$reason</span>);
</span><span id="213" class="l"> } <span class="php-keyword1">catch</span> (\Exception <span class="php-var">$reason</span>) {
</span><span id="214" class="l"> <span class="php-var">$promise</span>->reject(<span class="php-var">$reason</span>);
</span><span id="215" class="l"> }
</span><span id="216" class="l"> }
</span><span id="217" class="l">
</span><span id="218" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> waitIfPending()
</span><span id="219" class="l"> {
</span><span id="220" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state !== self::PENDING) {
</span><span id="221" class="l"> <span class="php-keyword1">return</span>;
</span><span id="222" class="l"> } <span class="php-keyword1">elseif</span> (<span class="php-var">$this</span>->waitFn) {
</span><span id="223" class="l"> <span class="php-var">$this</span>->invokeWaitFn();
</span><span id="224" class="l"> } <span class="php-keyword1">elseif</span> (<span class="php-var">$this</span>->waitList) {
</span><span id="225" class="l"> <span class="php-var">$this</span>->invokeWaitList();
</span><span id="226" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="227" class="l"> <span class="php-comment">// If there's not wait function, then reject the promise.</span>
</span><span id="228" class="l"> <span class="php-var">$this</span>->reject(<span class="php-quote">'Cannot wait on a promise that has '</span>
</span><span id="229" class="l"> . <span class="php-quote">'no internal wait function. You must provide a wait '</span>
</span><span id="230" class="l"> . <span class="php-quote">'function when constructing the promise to be able to '</span>
</span><span id="231" class="l"> . <span class="php-quote">'wait on a promise.'</span>);
</span><span id="232" class="l"> }
</span><span id="233" class="l">
</span><span id="234" class="l"> queue()->run();
</span><span id="235" class="l">
</span><span id="236" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state === self::PENDING) {
</span><span id="237" class="l"> <span class="php-var">$this</span>->reject(<span class="php-quote">'Invoking the wait callback did not resolve the promise'</span>);
</span><span id="238" class="l"> }
</span><span id="239" class="l"> }
</span><span id="240" class="l">
</span><span id="241" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> invokeWaitFn()
</span><span id="242" class="l"> {
</span><span id="243" class="l"> <span class="php-keyword1">try</span> {
</span><span id="244" class="l"> <span class="php-var">$wfn</span> = <span class="php-var">$this</span>->waitFn;
</span><span id="245" class="l"> <span class="php-var">$this</span>->waitFn = <span class="php-keyword1">null</span>;
</span><span id="246" class="l"> <span class="php-var">$wfn</span>(<span class="php-keyword1">true</span>);
</span><span id="247" class="l"> } <span class="php-keyword1">catch</span> (\Exception <span class="php-var">$reason</span>) {
</span><span id="248" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->state === self::PENDING) {
</span><span id="249" class="l"> <span class="php-comment">// The promise has not been resolved yet, so reject the promise</span>
</span><span id="250" class="l"> <span class="php-comment">// with the exception.</span>
</span><span id="251" class="l"> <span class="php-var">$this</span>->reject(<span class="php-var">$reason</span>);
</span><span id="252" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="253" class="l"> <span class="php-comment">// The promise was already resolved, so there's a problem in</span>
</span><span id="254" class="l"> <span class="php-comment">// the application.</span>
</span><span id="255" class="l"> <span class="php-keyword1">throw</span> <span class="php-var">$reason</span>;
</span><span id="256" class="l"> }
</span><span id="257" class="l"> }
</span><span id="258" class="l"> }
</span><span id="259" class="l">
</span><span id="260" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> invokeWaitList()
</span><span id="261" class="l"> {
</span><span id="262" class="l"> <span class="php-var">$waitList</span> = <span class="php-var">$this</span>->waitList;
</span><span id="263" class="l"> <span class="php-var">$this</span>->waitList = <span class="php-keyword1">null</span>;
</span><span id="264" class="l">
</span><span id="265" class="l"> <span class="php-keyword1">foreach</span> (<span class="php-var">$waitList</span> <span class="php-keyword1">as</span> <span class="php-var">$result</span>) {
</span><span id="266" class="l"> <span class="php-keyword1">while</span> (<span class="php-keyword1">true</span>) {
</span><span id="267" class="l"> <span class="php-var">$result</span>->waitIfPending();
</span><span id="268" class="l">
</span><span id="269" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$result</span>->result <span class="php-keyword1">instanceof</span> Promise) {
</span><span id="270" class="l"> <span class="php-var">$result</span> = <span class="php-var">$result</span>->result;
</span><span id="271" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="272" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$result</span>->result <span class="php-keyword1">instanceof</span> PromiseInterface) {
</span><span id="273" class="l"> <span class="php-var">$result</span>->result->wait(<span class="php-keyword1">false</span>);
</span><span id="274" class="l"> }
</span><span id="275" class="l"> <span class="php-keyword1">break</span>;
</span><span id="276" class="l"> }
</span><span id="277" class="l"> }
</span><span id="278" class="l"> }
</span><span id="279" class="l"> }
</span><span id="280" class="l">}
</span><span id="281" class="l"></span></code></pre>
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