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</pre><pre class="rust ">
<span class="kw">use</span> {<span class="ident">Async</span>, <span class="ident">Poll</span>, <span class="ident">IntoFuture</span>, <span class="ident">Future</span>};
<span class="kw">use</span> <span class="ident">stream</span>::<span class="ident">Stream</span>;
<span class="doccomment">/// A stream combinator which skips elements of a stream while a predicate</span>
<span class="doccomment">/// holds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This structure is produced by the `Stream::skip_while` method.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"streams do nothing unless polled"</span>]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SkipWhile</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>, <span class="ident">R</span>: <span class="ident">IntoFuture</span> {
<span class="ident">stream</span>: <span class="ident">S</span>,
<span class="ident">pred</span>: <span class="ident">P</span>,
<span class="ident">pending</span>: <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">R</span>::<span class="ident">Future</span>, <span class="ident">S</span>::<span class="ident">Item</span>)<span class="op">></span>,
<span class="ident">done_skipping</span>: <span class="ident">bool</span>,
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span>(<span class="ident">s</span>: <span class="ident">S</span>, <span class="ident">p</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SkipWhile</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">S</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">R</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">bool</span>, <span class="ident">Error</span><span class="op">=</span><span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="ident">SkipWhile</span> {
<span class="ident">stream</span>: <span class="ident">s</span>,
<span class="ident">pred</span>: <span class="ident">p</span>,
<span class="ident">pending</span>: <span class="prelude-val">None</span>,
<span class="ident">done_skipping</span>: <span class="bool-val">false</span>,
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">SkipWhile</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>, <span class="ident">R</span>: <span class="ident">IntoFuture</span> {
<span class="doccomment">/// Acquires a reference to the underlying stream that this combinator is</span>
<span class="doccomment">/// pulling from.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">S</span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">stream</span>
}
<span class="doccomment">/// Acquires a mutable reference to the underlying stream that this</span>
<span class="doccomment">/// combinator is pulling from.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that care must be taken to avoid tampering with the state of the</span>
<span class="doccomment">/// stream which may otherwise confuse this combinator.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">S</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">stream</span>
}
<span class="doccomment">/// Consumes this combinator, returning the underlying stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this may discard intermediate state of this combinator, so</span>
<span class="doccomment">/// care should be taken to avoid losing resources when this is called.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">S</span> {
<span class="self">self</span>.<span class="ident">stream</span>
}
}
<span class="comment">// Forwarding impl of Sink from the underlying stream</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span> ::<span class="ident">sink</span>::<span class="ident">Sink</span> <span class="kw">for</span> <span class="ident">SkipWhile</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: ::<span class="ident">sink</span>::<span class="ident">Sink</span> <span class="op">+</span> <span class="ident">Stream</span>, <span class="ident">R</span>: <span class="ident">IntoFuture</span>
{
<span class="kw">type</span> <span class="ident">SinkItem</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">SinkItem</span>;
<span class="kw">type</span> <span class="ident">SinkError</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">SinkError</span>;
<span class="kw">fn</span> <span class="ident">start_send</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">item</span>: <span class="ident">S</span>::<span class="ident">SinkItem</span>) <span class="op">-></span> ::<span class="ident">StartSend</span><span class="op"><</span><span class="ident">S</span>::<span class="ident">SinkItem</span>, <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">start_send</span>(<span class="ident">item</span>)
}
<span class="kw">fn</span> <span class="ident">poll_complete</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span>(), <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll_complete</span>()
}
<span class="kw">fn</span> <span class="ident">close</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span>(), <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">close</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Stream</span> <span class="kw">for</span> <span class="ident">SkipWhile</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">P</span>, <span class="ident">R</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">S</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">R</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">bool</span>, <span class="ident">Error</span><span class="op">=</span><span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">Item</span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">Error</span>;
<span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">S</span>::<span class="ident">Item</span><span class="op">></span>, <span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">done_skipping</span> {
<span class="kw">return</span> <span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll</span>();
}
<span class="kw">loop</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pending</span>.<span class="ident">is_none</span>() {
<span class="kw">let</span> <span class="ident">item</span> <span class="op">=</span> <span class="kw">match</span> <span class="macro">try_ready</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll</span>()) {
<span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="ident">e</span>,
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">None</span>)),
};
<span class="self">self</span>.<span class="ident">pending</span> <span class="op">=</span> <span class="prelude-val">Some</span>(((<span class="self">self</span>.<span class="ident">pred</span>)(<span class="kw-2">&</span><span class="ident">item</span>).<span class="ident">into_future</span>(), <span class="ident">item</span>));
}
<span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pending</span>.<span class="ident">is_some</span>());
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">pending</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>().<span class="number">0</span>.<span class="ident">poll</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="bool-val">true</span>)) <span class="op">=></span> <span class="self">self</span>.<span class="ident">pending</span> <span class="op">=</span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="bool-val">false</span>)) <span class="op">=></span> {
<span class="kw">let</span> (_, <span class="ident">item</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">pending</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
<span class="self">self</span>.<span class="ident">done_skipping</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">Some</span>(<span class="ident">item</span>)))
}
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>),
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">pending</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>)
}
}
}
}
}
</pre>
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