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</pre><pre class="rust">
<span class="doccomment">//! Common splitter for strings and slices</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module is private, so these items are effectively `pub(super)`</span>

<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::iter::plumbing</span>::{<span class="ident">Folder</span>, <span class="ident">UnindexedProducer</span>};

<span class="doccomment">/// Common producer for splitting on a predicate.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct</span> <span class="ident">SplitProducer</span><span class="op">&lt;</span><span class="lifetime">&#39;p</span>, <span class="ident">P</span>, <span class="ident">V</span><span class="op">&gt;</span> {
    <span class="ident">data</span>: <span class="ident">V</span>,
    <span class="ident">separator</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;p</span> <span class="ident">P</span>,

    <span class="doccomment">/// Marks the endpoint beyond which we&#39;ve already found no separators.</span>
    <span class="ident">tail</span>: <span class="ident">usize</span>,
}

<span class="doccomment">/// Helper trait so `&amp;str`, `&amp;[T]`, and `&amp;mut [T]` can share `SplitProducer`.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">trait</span> <span class="ident">Fissile</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
    <span class="kw">fn</span> <span class="ident">length</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span>;
    <span class="kw">fn</span> <span class="ident">midpoint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">end</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span>;
    <span class="kw">fn</span> <span class="ident">find</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">separator</span>: <span class="kw-2">&amp;</span><span class="ident">P</span>, <span class="ident">start</span>: <span class="ident">usize</span>, <span class="ident">end</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>;
    <span class="kw">fn</span> <span class="ident">rfind</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">separator</span>: <span class="kw-2">&amp;</span><span class="ident">P</span>, <span class="ident">end</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>;
    <span class="kw">fn</span> <span class="ident">split_once</span>(<span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="self">Self</span>, <span class="self">Self</span>);
    <span class="kw">fn</span> <span class="ident">fold_splits</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">separator</span>: <span class="kw-2">&amp;</span><span class="ident">P</span>, <span class="ident">folder</span>: <span class="ident">F</span>, <span class="ident">skip_last</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">F</span>
    <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">Folder</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>,
        <span class="self">Self</span>: <span class="ident">Send</span>;
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;p</span>, <span class="ident">P</span>, <span class="ident">V</span><span class="op">&gt;</span> <span class="ident">SplitProducer</span><span class="op">&lt;</span><span class="lifetime">&#39;p</span>, <span class="ident">P</span>, <span class="ident">V</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">V</span>: <span class="ident">Fissile</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">Send</span>,
{
    <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">data</span>: <span class="ident">V</span>, <span class="ident">separator</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;p</span> <span class="ident">P</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="ident">SplitProducer</span> {
            <span class="ident">tail</span>: <span class="ident">data</span>.<span class="ident">length</span>(),
            <span class="ident">data</span>,
            <span class="ident">separator</span>,
        }
    }

    <span class="doccomment">/// Common `fold_with` implementation, integrating `SplitTerminator`&#39;s</span>
    <span class="doccomment">/// need to sometimes skip its final empty item.</span>
    <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">fold_with</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">folder</span>: <span class="ident">F</span>, <span class="ident">skip_last</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">F</span>
    <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">Folder</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="ident">SplitProducer</span> {
            <span class="ident">data</span>,
            <span class="ident">separator</span>,
            <span class="ident">tail</span>,
        } <span class="op">=</span> <span class="self">self</span>;

        <span class="kw">if</span> <span class="ident">tail</span> <span class="op">=</span><span class="op">=</span> <span class="ident">data</span>.<span class="ident">length</span>() {
            <span class="comment">// No tail section, so just let `fold_splits` handle it.</span>
            <span class="ident">data</span>.<span class="ident">fold_splits</span>(<span class="ident">separator</span>, <span class="ident">folder</span>, <span class="ident">skip_last</span>)
        } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">index</span>) <span class="op">=</span> <span class="ident">data</span>.<span class="ident">rfind</span>(<span class="ident">separator</span>, <span class="ident">tail</span>) {
            <span class="comment">// We found the last separator to complete the tail, so</span>
            <span class="comment">// end with that slice after `fold_splits` finds the rest.</span>
            <span class="kw">let</span> (<span class="ident">left</span>, <span class="ident">right</span>) <span class="op">=</span> <span class="ident">data</span>.<span class="ident">split_once</span>(<span class="ident">index</span>);
            <span class="kw">let</span> <span class="ident">folder</span> <span class="op">=</span> <span class="ident">left</span>.<span class="ident">fold_splits</span>(<span class="ident">separator</span>, <span class="ident">folder</span>, <span class="bool-val">false</span>);
            <span class="kw">if</span> <span class="ident">skip_last</span> <span class="op">|</span><span class="op">|</span> <span class="ident">folder</span>.<span class="ident">full</span>() {
                <span class="ident">folder</span>
            } <span class="kw">else</span> {
                <span class="ident">folder</span>.<span class="ident">consume</span>(<span class="ident">right</span>)
            }
        } <span class="kw">else</span> {
            <span class="comment">// We know there are no separators at all.  Return our whole data.</span>
            <span class="kw">if</span> <span class="ident">skip_last</span> {
                <span class="ident">folder</span>
            } <span class="kw">else</span> {
                <span class="ident">folder</span>.<span class="ident">consume</span>(<span class="ident">data</span>)
            }
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;p</span>, <span class="ident">P</span>, <span class="ident">V</span><span class="op">&gt;</span> <span class="ident">UnindexedProducer</span> <span class="kw">for</span> <span class="ident">SplitProducer</span><span class="op">&lt;</span><span class="lifetime">&#39;p</span>, <span class="ident">P</span>, <span class="ident">V</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">V</span>: <span class="ident">Fissile</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">Send</span>,
    <span class="ident">P</span>: <span class="ident">Sync</span>,
{
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">V</span>;

    <span class="kw">fn</span> <span class="ident">split</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="self">Self</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>) {
        <span class="comment">// Look forward for the separator, and failing that look backward.</span>
        <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">midpoint</span>(<span class="self">self</span>.<span class="ident">tail</span>);
        <span class="kw">let</span> <span class="ident">index</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">find</span>(<span class="self">self</span>.<span class="ident">separator</span>, <span class="ident">mid</span>, <span class="self">self</span>.<span class="ident">tail</span>) {
            <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">mid</span> <span class="op">+</span> <span class="ident">i</span>),
            <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">rfind</span>(<span class="self">self</span>.<span class="ident">separator</span>, <span class="ident">mid</span>),
        };

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">index</span>) <span class="op">=</span> <span class="ident">index</span> {
            <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">length</span>();
            <span class="kw">let</span> (<span class="ident">left</span>, <span class="ident">right</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">split_once</span>(<span class="ident">index</span>);

            <span class="kw">let</span> (<span class="ident">left_tail</span>, <span class="ident">right_tail</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">index</span> <span class="op">&lt;</span> <span class="ident">mid</span> {
                <span class="comment">// If we scanned backwards to find the separator, everything in</span>
                <span class="comment">// the right side is exhausted, with no separators left to find.</span>
                (<span class="ident">index</span>, <span class="number">0</span>)
            } <span class="kw">else</span> {
                <span class="kw">let</span> <span class="ident">right_index</span> <span class="op">=</span> <span class="ident">len</span> <span class="op">-</span> <span class="ident">right</span>.<span class="ident">length</span>();
                (<span class="ident">mid</span>, <span class="self">self</span>.<span class="ident">tail</span> <span class="op">-</span> <span class="ident">right_index</span>)
            };

            <span class="comment">// Create the left split before the separator.</span>
            <span class="kw">let</span> <span class="ident">left</span> <span class="op">=</span> <span class="ident">SplitProducer</span> {
                <span class="ident">data</span>: <span class="ident">left</span>,
                <span class="ident">tail</span>: <span class="ident">left_tail</span>,
                ..<span class="self">self</span>
            };

            <span class="comment">// Create the right split following the separator.</span>
            <span class="kw">let</span> <span class="ident">right</span> <span class="op">=</span> <span class="ident">SplitProducer</span> {
                <span class="ident">data</span>: <span class="ident">right</span>,
                <span class="ident">tail</span>: <span class="ident">right_tail</span>,
                ..<span class="self">self</span>
            };

            (<span class="ident">left</span>, <span class="prelude-val">Some</span>(<span class="ident">right</span>))
        } <span class="kw">else</span> {
            <span class="comment">// The search is exhausted, no more separators...</span>
            (<span class="ident">SplitProducer</span> { <span class="ident">tail</span>: <span class="number">0</span>, ..<span class="self">self</span> }, <span class="prelude-val">None</span>)
        }
    }

    <span class="kw">fn</span> <span class="ident">fold_with</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">folder</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">F</span>
    <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">Folder</span><span class="op">&lt;</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">fold_with</span>(<span class="ident">folder</span>, <span class="bool-val">false</span>)
    }
}
</pre></div>
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