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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-keyword1">use</span> Exception;
</span><span id="5" class="l"><span class="php-keyword1">use</span> Generator;
</span><span id="6" class="l"><span class="php-keyword1">use</span> Throwable;
</span><span id="7" class="l">
</span><span id="8" class="l"><span class="php-comment">/**
</span></span><span id="9" class="l"><span class="php-comment"> * Creates a promise that is resolved using a generator that yields values or
</span></span><span id="10" class="l"><span class="php-comment"> * promises (somewhat similar to C#'s async keyword).
</span></span><span id="11" class="l"><span class="php-comment"> *
</span></span><span id="12" class="l"><span class="php-comment"> * When called, the coroutine function will start an instance of the generator
</span></span><span id="13" class="l"><span class="php-comment"> * and returns a promise that is fulfilled with its final yielded value.
</span></span><span id="14" class="l"><span class="php-comment"> *
</span></span><span id="15" class="l"><span class="php-comment"> * Control is returned back to the generator when the yielded promise settles.
</span></span><span id="16" class="l"><span class="php-comment"> * This can lead to less verbose code when doing lots of sequential async calls
</span></span><span id="17" class="l"><span class="php-comment"> * with minimal processing in between.
</span></span><span id="18" class="l"><span class="php-comment"> *
</span></span><span id="19" class="l"><span class="php-comment"> * use GuzzleHttp\Promise;
</span></span><span id="20" class="l"><span class="php-comment"> *
</span></span><span id="21" class="l"><span class="php-comment"> * function createPromise($value) {
</span></span><span id="22" class="l"><span class="php-comment"> * return new Promise\FulfilledPromise($value);
</span></span><span id="23" class="l"><span class="php-comment"> * }
</span></span><span id="24" class="l"><span class="php-comment"> *
</span></span><span id="25" class="l"><span class="php-comment"> * $promise = Promise\coroutine(function () {
</span></span><span id="26" class="l"><span class="php-comment"> * $value = (yield createPromise('a'));
</span></span><span id="27" class="l"><span class="php-comment"> * try {
</span></span><span id="28" class="l"><span class="php-comment"> * $value = (yield createPromise($value . 'b'));
</span></span><span id="29" class="l"><span class="php-comment"> * } catch (\Exception $e) {
</span></span><span id="30" class="l"><span class="php-comment"> * // The promise was rejected.
</span></span><span id="31" class="l"><span class="php-comment"> * }
</span></span><span id="32" class="l"><span class="php-comment"> * yield $value . 'c';
</span></span><span id="33" class="l"><span class="php-comment"> * });
</span></span><span id="34" class="l"><span class="php-comment"> *
</span></span><span id="35" class="l"><span class="php-comment"> * // Outputs "abc"
</span></span><span id="36" class="l"><span class="php-comment"> * $promise->then(function ($v) { echo $v; });
</span></span><span id="37" class="l"><span class="php-comment"> *
</span></span><span id="38" class="l"><span class="php-comment"> * @param callable $generatorFn Generator function to wrap into a promise.
</span></span><span id="39" class="l"><span class="php-comment"> *
</span></span><span id="40" class="l"><span class="php-comment"> * @return Promise
</span></span><span id="41" class="l"><span class="php-comment"> * @link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration
</span></span><span id="42" class="l"><span class="php-comment"> */</span>
</span><span id="43" class="l"><span class="php-keyword1">final</span> <span class="php-keyword1">class</span> Coroutine <span class="php-keyword1">implements</span> PromiseInterface
</span><span id="44" class="l">{
</span><span id="45" class="l"> <span class="php-comment">/**
</span></span><span id="46" class="l"><span class="php-comment"> * @var PromiseInterface|null
</span></span><span id="47" class="l"><span class="php-comment"> */</span>
</span><span id="48" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$currentPromise</span>;
</span><span id="49" class="l">
</span><span id="50" class="l"> <span class="php-comment">/**
</span></span><span id="51" class="l"><span class="php-comment"> * @var Generator
</span></span><span id="52" class="l"><span class="php-comment"> */</span>
</span><span id="53" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$generator</span>;
</span><span id="54" class="l">
</span><span id="55" class="l"> <span class="php-comment">/**
</span></span><span id="56" class="l"><span class="php-comment"> * @var Promise
</span></span><span id="57" class="l"><span class="php-comment"> */</span>
</span><span id="58" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$result</span>;
</span><span id="59" class="l">
</span><span id="60" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(<span class="php-keyword1">callable</span> <span class="php-var">$generatorFn</span>)
</span><span id="61" class="l"> {
</span><span id="62" class="l"> <span class="php-var">$this</span>->generator = <span class="php-var">$generatorFn</span>();
</span><span id="63" class="l"> <span class="php-var">$this</span>->result = <span class="php-keyword1">new</span> Promise(<span class="php-keyword1">function</span> () {
</span><span id="64" class="l"> <span class="php-keyword1">while</span> (<span class="php-keyword1">isset</span>(<span class="php-var">$this</span>->currentPromise)) {
</span><span id="65" class="l"> <span class="php-var">$this</span>->currentPromise->wait();
</span><span id="66" class="l"> }
</span><span id="67" class="l"> });
</span><span id="68" class="l"> <span class="php-var">$this</span>->nextCoroutine(<span class="php-var">$this</span>->generator-><span class="php-keyword2">current</span>());
</span><span id="69" class="l"> }
</span><span id="70" class="l">
</span><span id="71" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> then(
</span><span id="72" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$onFulfilled</span> = <span class="php-keyword1">null</span>,
</span><span id="73" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$onRejected</span> = <span class="php-keyword1">null</span>
</span><span id="74" class="l"> ) {
</span><span id="75" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->result->then(<span class="php-var">$onFulfilled</span>, <span class="php-var">$onRejected</span>);
</span><span id="76" class="l"> }
</span><span id="77" class="l">
</span><span id="78" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> otherwise(<span class="php-keyword1">callable</span> <span class="php-var">$onRejected</span>)
</span><span id="79" class="l"> {
</span><span id="80" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->result->otherwise(<span class="php-var">$onRejected</span>);
</span><span id="81" class="l"> }
</span><span id="82" class="l">
</span><span id="83" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> wait(<span class="php-var">$unwrap</span> = <span class="php-keyword1">true</span>)
</span><span id="84" class="l"> {
</span><span id="85" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->result->wait(<span class="php-var">$unwrap</span>);
</span><span id="86" class="l"> }
</span><span id="87" class="l">
</span><span id="88" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getState()
</span><span id="89" class="l"> {
</span><span id="90" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->result->getState();
</span><span id="91" class="l"> }
</span><span id="92" class="l">
</span><span id="93" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> resolve(<span class="php-var">$value</span>)
</span><span id="94" class="l"> {
</span><span id="95" class="l"> <span class="php-var">$this</span>->result->resolve(<span class="php-var">$value</span>);
</span><span id="96" class="l"> }
</span><span id="97" class="l">
</span><span id="98" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> reject(<span class="php-var">$reason</span>)
</span><span id="99" class="l"> {
</span><span id="100" class="l"> <span class="php-var">$this</span>->result->reject(<span class="php-var">$reason</span>);
</span><span id="101" class="l"> }
</span><span id="102" class="l">
</span><span id="103" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> cancel()
</span><span id="104" class="l"> {
</span><span id="105" class="l"> <span class="php-var">$this</span>->currentPromise->cancel();
</span><span id="106" class="l"> <span class="php-var">$this</span>->result->cancel();
</span><span id="107" class="l"> }
</span><span id="108" class="l">
</span><span id="109" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> nextCoroutine(<span class="php-var">$yielded</span>)
</span><span id="110" class="l"> {
</span><span id="111" class="l"> <span class="php-var">$this</span>->currentPromise = promise_for(<span class="php-var">$yielded</span>)
</span><span id="112" class="l"> ->then([<span class="php-var">$this</span>, <span class="php-quote">'_handleSuccess'</span>], [<span class="php-var">$this</span>, <span class="php-quote">'_handleFailure'</span>]);
</span><span id="113" class="l"> }
</span><span id="114" class="l">
</span><span id="115" class="l"> <span class="php-comment">/**
</span></span><span id="116" class="l"><span class="php-comment"> * @internal
</span></span><span id="117" class="l"><span class="php-comment"> */</span>
</span><span id="118" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> _handleSuccess(<span class="php-var">$value</span>)
</span><span id="119" class="l"> {
</span><span id="120" class="l"> <span class="php-keyword1">unset</span>(<span class="php-var">$this</span>->currentPromise);
</span><span id="121" class="l"> <span class="php-keyword1">try</span> {
</span><span id="122" class="l"> <span class="php-var">$next</span> = <span class="php-var">$this</span>->generator->send(<span class="php-var">$value</span>);
</span><span id="123" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->generator->valid()) {
</span><span id="124" class="l"> <span class="php-var">$this</span>->nextCoroutine(<span class="php-var">$next</span>);
</span><span id="125" class="l"> } <span class="php-keyword1">else</span> {
</span><span id="126" class="l"> <span class="php-var">$this</span>->result->resolve(<span class="php-var">$value</span>);
</span><span id="127" class="l"> }
</span><span id="128" class="l"> } <span class="php-keyword1">catch</span> (Exception <span class="php-var">$exception</span>) {
</span><span id="129" class="l"> <span class="php-var">$this</span>->result->reject(<span class="php-var">$exception</span>);
</span><span id="130" class="l"> } <span class="php-keyword1">catch</span> (Throwable <span class="php-var">$throwable</span>) {
</span><span id="131" class="l"> <span class="php-var">$this</span>->result->reject(<span class="php-var">$throwable</span>);
</span><span id="132" class="l"> }
</span><span id="133" class="l"> }
</span><span id="134" class="l">
</span><span id="135" class="l"> <span class="php-comment">/**
</span></span><span id="136" class="l"><span class="php-comment"> * @internal
</span></span><span id="137" class="l"><span class="php-comment"> */</span>
</span><span id="138" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> _handleFailure(<span class="php-var">$reason</span>)
</span><span id="139" class="l"> {
</span><span id="140" class="l"> <span class="php-keyword1">unset</span>(<span class="php-var">$this</span>->currentPromise);
</span><span id="141" class="l"> <span class="php-keyword1">try</span> {
</span><span id="142" class="l"> <span class="php-var">$nextYield</span> = <span class="php-var">$this</span>->generator-><span class="php-keyword1">throw</span>(exception_for(<span class="php-var">$reason</span>));
</span><span id="143" class="l"> <span class="php-comment">// The throw was caught, so keep iterating on the coroutine</span>
</span><span id="144" class="l"> <span class="php-var">$this</span>->nextCoroutine(<span class="php-var">$nextYield</span>);
</span><span id="145" class="l"> } <span class="php-keyword1">catch</span> (Exception <span class="php-var">$exception</span>) {
</span><span id="146" class="l"> <span class="php-var">$this</span>->result->reject(<span class="php-var">$exception</span>);
</span><span id="147" class="l"> } <span class="php-keyword1">catch</span> (Throwable <span class="php-var">$throwable</span>) {
</span><span id="148" class="l"> <span class="php-var">$this</span>->result->reject(<span class="php-var">$throwable</span>);
</span><span id="149" class="l"> }
</span><span id="150" class="l"> }
</span><span id="151" class="l">}
</span><span id="152" class="l"></span></code></pre>
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