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<section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>;
<span class="kw">use</span> <span class="ident">memchr</span>::<span class="ident">memchr</span>;
<span class="kw">use</span> <span class="ident">bytes</span>::<span class="ident">Captures</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expand</span>(<span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="ident">Captures</span>, <span class="kw-2">mut</span> <span class="ident">replacement</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
<span class="kw">while</span> <span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>() {
<span class="kw">match</span> <span class="ident">memchr</span>(<span class="string">b&#39;$&#39;</span>, <span class="ident">replacement</span>) {
<span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> {
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="kw-2">&amp;</span><span class="ident">replacement</span>[..<span class="ident">i</span>]);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="ident">i</span>..];
}
}
<span class="kw">if</span> <span class="ident">replacement</span>.<span class="ident">get</span>(<span class="number">1</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b&#39;$&#39;</span>) {
<span class="ident">dst</span>.<span class="ident">push</span>(<span class="string">b&#39;$&#39;</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="number">2</span>..];
<span class="kw">continue</span>;
}
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">cap_ref</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">find_cap_ref</span>(<span class="ident">replacement</span>) {
<span class="prelude-val">Some</span>(<span class="ident">cap_ref</span>) <span class="op">=&gt;</span> <span class="ident">cap_ref</span>,
<span class="prelude-val">None</span> <span class="op">=&gt;</span> {
<span class="ident">dst</span>.<span class="ident">push</span>(<span class="string">b&#39;$&#39;</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="number">1</span>..];
<span class="kw">continue</span>;
}
};
<span class="ident">replacement</span> <span class="op">=</span> <span class="ident">cap_ref</span>.<span class="ident">rest</span>;
<span class="kw">match</span> <span class="ident">cap_ref</span>.<span class="ident">cap</span> {
<span class="ident">Ref</span>::<span class="ident">Number</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">caps</span>.<span class="ident">at</span>(<span class="ident">i</span>).<span class="ident">unwrap_or</span>(<span class="string">b&quot;&quot;</span>)),
<span class="ident">Ref</span>::<span class="ident">Named</span>(<span class="ident">name</span>) <span class="op">=&gt;</span> <span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">caps</span>.<span class="ident">name</span>(<span class="ident">name</span>).<span class="ident">unwrap_or</span>(<span class="string">b&quot;&quot;</span>)),
}
}
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">replacement</span>);
}
<span class="kw">struct</span> <span class="ident">CaptureRef</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="ident">rest</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>],
<span class="ident">cap</span>: <span class="ident">Ref</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}
<span class="kw">enum</span> <span class="ident">Ref</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="ident">Named</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span>),
<span class="ident">Number</span>(<span class="ident">usize</span>),
}
<span class="kw">fn</span> <span class="ident">find_cap_ref</span>(<span class="kw-2">mut</span> <span class="ident">replacement</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CaptureRef</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="ident">replacement</span>.<span class="ident">len</span>() <span class="op">&lt;=</span> <span class="number">1</span> <span class="op">||</span> <span class="ident">replacement</span>[<span class="number">0</span>] <span class="op">!=</span> <span class="string">b&#39;$&#39;</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">brace</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="number">1</span>..];
<span class="kw">if</span> <span class="ident">replacement</span>[<span class="number">0</span>] <span class="op">==</span> <span class="string">b&#39;{&#39;</span> {
<span class="ident">brace</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="number">1</span>..];
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cap_end</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">replacement</span>.<span class="ident">get</span>(<span class="ident">cap_end</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="ident">is_valid_cap_letter</span>) {
<span class="ident">cap_end</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="ident">cap_end</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="comment">// We just verified that the range 0..cap_end is valid ASCII, so it must</span>
<span class="comment">// therefore be valid UTF-8. If we really cared, we could avoid this UTF-8</span>
<span class="comment">// check with either unsafe or by parsing the number straight from &amp;[u8].</span>
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&amp;</span><span class="ident">replacement</span>[..<span class="ident">cap_end</span>])
.<span class="ident">ok</span>().<span class="ident">expect</span>(<span class="string">&quot;valid UTF-8 capture name&quot;</span>);
<span class="kw">if</span> <span class="ident">brace</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">replacement</span>.<span class="ident">get</span>(<span class="ident">cap_end</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b&#39;}&#39;</span>) {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="ident">cap_end</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="prelude-val">Some</span>(<span class="ident">CaptureRef</span> {
<span class="ident">rest</span>: <span class="kw-2">&amp;</span><span class="ident">replacement</span>[<span class="ident">cap_end</span>..],
<span class="ident">cap</span>: <span class="kw">match</span> <span class="ident">cap</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">Ref</span>::<span class="ident">Number</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span>),
<span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="ident">Ref</span>::<span class="ident">Named</span>(<span class="ident">cap</span>),
},
})
}
<span class="kw">fn</span> <span class="ident">is_valid_cap_letter</span>(<span class="ident">b</span>: <span class="kw-2">&amp;</span><span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">b</span> {
<span class="string">b&#39;0&#39;</span> ... <span class="string">b&#39;9&#39;</span> <span class="op">|</span> <span class="string">b&#39;a&#39;</span> ... <span class="string">b&#39;z&#39;</span> <span class="op">|</span> <span class="string">b&#39;A&#39;</span> ... <span class="string">b&#39;Z&#39;</span> <span class="op">|</span> <span class="string">b&#39;_&#39;</span> <span class="op">=&gt;</span> <span class="bool-val">true</span>,
_ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
}
}
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