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</pre><pre class="rust"><code><span class="attribute">#[cfg(feature = <span class="string">&quot;parsing&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::lookahead;
<span class="kw">pub use </span>proc_macro2::Ident;
<span class="attribute">#[cfg(not(doc))] </span><span class="comment">// rustdoc bug: https://github.com/rust-lang/rust/issues/105735
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;parsing&quot;</span>)]
#[doc(hidden)]
#[allow(non_snake_case)]
</span><span class="kw">pub fn </span>Ident(marker: lookahead::TokenMarker) -&gt; Ident {
<span class="kw">match </span>marker {}
}
<span class="macro">macro_rules! </span>ident_from_token {
(<span class="macro-nonterminal">$token</span>:ident) =&gt; {
<span class="kw">impl </span>From&lt;<span class="macro">Token!</span>[<span class="macro-nonterminal">$token</span>]&gt; <span class="kw">for </span>Ident {
<span class="kw">fn </span>from(token: <span class="macro">Token!</span>[<span class="macro-nonterminal">$token</span>]) -&gt; Ident {
Ident::new(<span class="macro">stringify!</span>(<span class="macro-nonterminal">$token</span>), token.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>From&lt;<span class="macro">Token!</span>[<span class="kw">_</span>]&gt; <span class="kw">for </span>Ident {
<span class="kw">fn </span>from(token: <span class="macro">Token!</span>[<span class="kw">_</span>]) -&gt; Ident {
Ident::new(<span class="string">&quot;_&quot;</span>, token.span)
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>xid_ok(symbol: <span class="kw-2">&amp;</span>str) -&gt; bool {
<span class="kw">let </span><span class="kw-2">mut </span>chars = symbol.chars();
<span class="kw">let </span>first = chars.next().unwrap();
<span class="kw">if </span>!(first == <span class="string">&#39;_&#39; </span>|| unicode_ident::is_xid_start(first)) {
<span class="kw">return </span><span class="bool-val">false</span>;
}
<span class="kw">for </span>ch <span class="kw">in </span>chars {
<span class="kw">if </span>!unicode_ident::is_xid_continue(ch) {
<span class="kw">return </span><span class="bool-val">false</span>;
}
}
<span class="bool-val">true
</span>}
<span class="attribute">#[cfg(feature = <span class="string">&quot;parsing&quot;</span>)]
</span><span class="kw">mod </span>parsing {
<span class="kw">use </span><span class="kw">crate</span>::buffer::Cursor;
<span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>};
<span class="kw">use </span><span class="kw">crate</span>::token::Token;
<span class="kw">use </span>proc_macro2::Ident;
<span class="kw">fn </span>accept_as_ident(ident: <span class="kw-2">&amp;</span>Ident) -&gt; bool {
<span class="kw">match </span>ident.to_string().as_str() {
<span class="string">&quot;_&quot; </span>|
<span class="comment">// Based on https://doc.rust-lang.org/1.65.0/reference/keywords.html
</span><span class="string">&quot;abstract&quot; </span>| <span class="string">&quot;as&quot; </span>| <span class="string">&quot;async&quot; </span>| <span class="string">&quot;await&quot; </span>| <span class="string">&quot;become&quot; </span>| <span class="string">&quot;box&quot; </span>| <span class="string">&quot;break&quot; </span>|
<span class="string">&quot;const&quot; </span>| <span class="string">&quot;continue&quot; </span>| <span class="string">&quot;crate&quot; </span>| <span class="string">&quot;do&quot; </span>| <span class="string">&quot;dyn&quot; </span>| <span class="string">&quot;else&quot; </span>| <span class="string">&quot;enum&quot; </span>|
<span class="string">&quot;extern&quot; </span>| <span class="string">&quot;false&quot; </span>| <span class="string">&quot;final&quot; </span>| <span class="string">&quot;fn&quot; </span>| <span class="string">&quot;for&quot; </span>| <span class="string">&quot;if&quot; </span>| <span class="string">&quot;impl&quot; </span>| <span class="string">&quot;in&quot; </span>|
<span class="string">&quot;let&quot; </span>| <span class="string">&quot;loop&quot; </span>| <span class="string">&quot;macro&quot; </span>| <span class="string">&quot;match&quot; </span>| <span class="string">&quot;mod&quot; </span>| <span class="string">&quot;move&quot; </span>| <span class="string">&quot;mut&quot; </span>|
<span class="string">&quot;override&quot; </span>| <span class="string">&quot;priv&quot; </span>| <span class="string">&quot;pub&quot; </span>| <span class="string">&quot;ref&quot; </span>| <span class="string">&quot;return&quot; </span>| <span class="string">&quot;Self&quot; </span>| <span class="string">&quot;self&quot; </span>|
<span class="string">&quot;static&quot; </span>| <span class="string">&quot;struct&quot; </span>| <span class="string">&quot;super&quot; </span>| <span class="string">&quot;trait&quot; </span>| <span class="string">&quot;true&quot; </span>| <span class="string">&quot;try&quot; </span>| <span class="string">&quot;type&quot; </span>|
<span class="string">&quot;typeof&quot; </span>| <span class="string">&quot;unsafe&quot; </span>| <span class="string">&quot;unsized&quot; </span>| <span class="string">&quot;use&quot; </span>| <span class="string">&quot;virtual&quot; </span>| <span class="string">&quot;where&quot; </span>|
<span class="string">&quot;while&quot; </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">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;parsing&quot;</span>)))]
</span><span class="kw">impl </span>Parse <span class="kw">for </span>Ident {
<span class="kw">fn </span>parse(input: ParseStream) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
input.step(|cursor| {
<span class="kw">if let </span><span class="prelude-val">Some</span>((ident, rest)) = cursor.ident() {
<span class="kw">if </span>accept_as_ident(<span class="kw-2">&amp;</span>ident) {
<span class="prelude-val">Ok</span>((ident, rest))
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(cursor.error(<span class="macro">format_args!</span>(
<span class="string">&quot;expected identifier, found keyword `{}`&quot;</span>,
ident,
)))
}
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(cursor.error(<span class="string">&quot;expected identifier&quot;</span>))
}
})
}
}
<span class="kw">impl </span>Token <span class="kw">for </span>Ident {
<span class="kw">fn </span>peek(cursor: Cursor) -&gt; bool {
<span class="kw">if let </span><span class="prelude-val">Some</span>((ident, _rest)) = cursor.ident() {
accept_as_ident(<span class="kw-2">&amp;</span>ident)
} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
}
<span class="kw">fn </span>display() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
<span class="string">&quot;identifier&quot;
</span>}
}
}
</code></pre></div>
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