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</pre><pre class="rust"><code><span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::buffer::Cursor</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::lookahead</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::token::Token</span>;
<span class="kw">use</span> <span class="ident">unicode_xid::UnicodeXID</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">proc_macro2::Ident</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">Ident</span>(<span class="ident">marker</span>: <span class="ident">lookahead::TokenMarker</span>) -&gt; <span class="ident">Ident</span> {
<span class="kw">match</span> <span class="ident">marker</span> {}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">fn</span> <span class="ident">accept_as_ident</span>(<span class="ident">ident</span>: <span class="kw-2">&amp;</span><span class="ident">Ident</span>) -&gt; <span class="ident">bool</span> {
<span class="kw">match</span> <span class="ident">ident</span>.<span class="ident">to_string</span>().<span class="ident">as_str</span>() {
<span class="string">&quot;_&quot;</span> <span class="op">|</span>
<span class="comment">// Based on https://doc.rust-lang.org/grammar.html#keywords</span>
<span class="comment">// and https://github.com/rust-lang/rfcs/blob/master/text/2421-unreservations-2018.md</span>
<span class="comment">// and https://github.com/rust-lang/rfcs/blob/master/text/2420-unreserve-proc.md</span>
<span class="string">&quot;abstract&quot;</span> <span class="op">|</span> <span class="string">&quot;as&quot;</span> <span class="op">|</span> <span class="string">&quot;become&quot;</span> <span class="op">|</span> <span class="string">&quot;box&quot;</span> <span class="op">|</span> <span class="string">&quot;break&quot;</span> <span class="op">|</span> <span class="string">&quot;const&quot;</span> <span class="op">|</span> <span class="string">&quot;continue&quot;</span> <span class="op">|</span>
<span class="string">&quot;crate&quot;</span> <span class="op">|</span> <span class="string">&quot;do&quot;</span> <span class="op">|</span> <span class="string">&quot;else&quot;</span> <span class="op">|</span> <span class="string">&quot;enum&quot;</span> <span class="op">|</span> <span class="string">&quot;extern&quot;</span> <span class="op">|</span> <span class="string">&quot;false&quot;</span> <span class="op">|</span> <span class="string">&quot;final&quot;</span> <span class="op">|</span> <span class="string">&quot;fn&quot;</span> <span class="op">|</span>
<span class="string">&quot;for&quot;</span> <span class="op">|</span> <span class="string">&quot;if&quot;</span> <span class="op">|</span> <span class="string">&quot;impl&quot;</span> <span class="op">|</span> <span class="string">&quot;in&quot;</span> <span class="op">|</span> <span class="string">&quot;let&quot;</span> <span class="op">|</span> <span class="string">&quot;loop&quot;</span> <span class="op">|</span> <span class="string">&quot;macro&quot;</span> <span class="op">|</span> <span class="string">&quot;match&quot;</span> <span class="op">|</span>
<span class="string">&quot;mod&quot;</span> <span class="op">|</span> <span class="string">&quot;move&quot;</span> <span class="op">|</span> <span class="string">&quot;mut&quot;</span> <span class="op">|</span> <span class="string">&quot;override&quot;</span> <span class="op">|</span> <span class="string">&quot;priv&quot;</span> <span class="op">|</span> <span class="string">&quot;pub&quot;</span> <span class="op">|</span> <span class="string">&quot;ref&quot;</span> <span class="op">|</span>
<span class="string">&quot;return&quot;</span> <span class="op">|</span> <span class="string">&quot;Self&quot;</span> <span class="op">|</span> <span class="string">&quot;self&quot;</span> <span class="op">|</span> <span class="string">&quot;static&quot;</span> <span class="op">|</span> <span class="string">&quot;struct&quot;</span> <span class="op">|</span> <span class="string">&quot;super&quot;</span> <span class="op">|</span> <span class="string">&quot;trait&quot;</span> <span class="op">|</span>
<span class="string">&quot;true&quot;</span> <span class="op">|</span> <span class="string">&quot;type&quot;</span> <span class="op">|</span> <span class="string">&quot;typeof&quot;</span> <span class="op">|</span> <span class="string">&quot;unsafe&quot;</span> <span class="op">|</span> <span class="string">&quot;unsized&quot;</span> <span class="op">|</span> <span class="string">&quot;use&quot;</span> <span class="op">|</span> <span class="string">&quot;virtual&quot;</span> <span class="op">|</span>
<span class="string">&quot;where&quot;</span> <span class="op">|</span> <span class="string">&quot;while&quot;</span> <span class="op">|</span> <span class="string">&quot;yield&quot;</span> =&gt; <span class="bool-val">false</span>,
<span class="kw">_</span> =&gt; <span class="bool-val">true</span>,
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span> {
<span class="ident">input</span>.<span class="ident">step</span>(<span class="op">|</span><span class="ident">cursor</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">ident</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">ident</span>() {
<span class="kw">if</span> <span class="ident">accept_as_ident</span>(<span class="kw-2">&amp;</span><span class="ident">ident</span>) {
<span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">ident</span>, <span class="ident">rest</span>));
}
}
<span class="prelude-val">Err</span>(<span class="ident">cursor</span>.<span class="ident">error</span>(<span class="string">&quot;expected identifier&quot;</span>))
})
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
<span class="kw">impl</span> <span class="ident">Token</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">peek</span>(<span class="ident">cursor</span>: <span class="ident">Cursor</span>) -&gt; <span class="ident">bool</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">ident</span>, <span class="ident">_rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">ident</span>() {
<span class="ident">accept_as_ident</span>(<span class="kw-2">&amp;</span><span class="ident">ident</span>)
} <span class="kw">else</span> {
<span class="bool-val">false</span>
}
}
<span class="kw">fn</span> <span class="ident">display</span>() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span> {
<span class="string">&quot;identifier&quot;</span>
}
}
<span class="macro">macro_rules!</span> <span class="ident">ident_from_token</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">token</span>:<span class="ident">ident</span>) =&gt; {
<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="macro">Token!</span>[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">token</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">token</span>: <span class="macro">Token!</span>[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">token</span>]) -&gt; <span class="ident">Ident</span> {
<span class="ident">Ident::new</span>(<span class="macro">stringify!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">token</span>), <span class="ident">token</span>.<span class="ident">span</span>)
}
}
};
}
<span class="macro">ident_from_token!</span>(<span class="self">self</span>);
<span class="macro">ident_from_token!</span>(<span class="self">Self</span>);
<span class="macro">ident_from_token!</span>(<span class="kw">super</span>);
<span class="macro">ident_from_token!</span>(<span class="kw">crate</span>);
<span class="macro">ident_from_token!</span>(<span class="kw">extern</span>);
<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="macro">Token!</span>[<span class="kw">_</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">token</span>: <span class="macro">Token!</span>[<span class="kw">_</span>]) -&gt; <span class="ident">Ident</span> {
<span class="ident">Ident::new</span>(<span class="string">&quot;_&quot;</span>, <span class="ident">token</span>.<span class="ident">span</span>)
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">xid_ok</span>(<span class="ident">symbol</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="ident">bool</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">symbol</span>.<span class="ident">chars</span>();
<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>();
<span class="kw">if</span> <span class="op">!</span>(<span class="ident">UnicodeXID::is_xid_start</span>(<span class="ident">first</span>) <span class="op">|</span><span class="op">|</span> <span class="ident">first</span> <span class="op">==</span> <span class="string">&#39;_&#39;</span>) {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
<span class="kw">for</span> <span class="ident">ch</span> <span class="kw">in</span> <span class="ident">chars</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">UnicodeXID::is_xid_continue</span>(<span class="ident">ch</span>) {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
}
<span class="bool-val">true</span>
}
</code></pre></div>
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