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</pre><pre class="rust ">
<span class="comment">// Copyright 2016 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! # Quasiquoter</span>
<span class="doccomment">//! This file contains the implementation internals of the quasiquoter provided by `quote!`.</span>
<span class="doccomment">//! This quasiquoter uses macros 2.0 hygiene to reliably access</span>
<span class="doccomment">//! items from `proc_macro`, to build a `proc_macro::TokenStream`.</span>
<span class="kw">use</span> {<span class="ident">Delimiter</span>, <span class="ident">Literal</span>, <span class="ident">Spacing</span>, <span class="ident">Span</span>, <span class="ident">Ident</span>, <span class="ident">Punct</span>, <span class="ident">Group</span>, <span class="ident">TokenStream</span>, <span class="ident">TokenTree</span>};
<span class="kw">use</span> <span class="ident">syntax</span>::<span class="ident">ext</span>::<span class="ident">base</span>::{<span class="ident">ExtCtxt</span>, <span class="ident">ProcMacro</span>};
<span class="kw">use</span> <span class="ident">syntax</span>::<span class="ident">parse</span>::<span class="ident">token</span>;
<span class="kw">use</span> <span class="ident">syntax</span>::<span class="ident">symbol</span>::<span class="ident">Symbol</span>;
<span class="kw">use</span> <span class="ident">syntax</span>::<span class="ident">tokenstream</span>;
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Quoter</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unquote</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">TokenStream</span><span class="op">></span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span>(<span class="ident">tokens</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="ident">tokens</span>.<span class="ident">clone</span>().<span class="ident">into</span>()
}
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Quote</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span>;
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">tt2ts</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=></span> (<span class="ident">TokenStream</span>::<span class="ident">from</span>(<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>)))
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">quote_tok</span> {
(,) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">','</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(.) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'.'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(:) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">':'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="op">|</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'|'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(::) <span class="op">=></span> {
[
<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">':'</span>, <span class="ident">Spacing</span>::<span class="ident">Joint</span>)),
<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">':'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)),
].<span class="ident">iter</span>()
.<span class="ident">cloned</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">x</span><span class="op">|</span> {
<span class="ident">x</span>.<span class="ident">set_span</span>(<span class="ident">Span</span>::<span class="ident">def_site</span>());
<span class="ident">x</span>
})
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">TokenStream</span><span class="op">></span>()
};
(<span class="op">!</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'!'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="op"><</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'<'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="op">></span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'>'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="kw">_</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'_'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="number">0</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Literal</span>::<span class="ident">i8_unsuffixed</span>(<span class="number">0</span>)) };
(<span class="kw-2">&</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">'&'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>)) };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Ident</span>::<span class="ident">new</span>(<span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>), <span class="ident">Span</span>::<span class="ident">def_site</span>())) };
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">quote_tree</span> {
((<span class="ident">unquote</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>)) <span class="op">=></span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="op">*</span> };
((<span class="ident">quote</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>)) <span class="op">=></span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>).<span class="ident">quote</span>() };
(($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>)) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Group</span>::<span class="ident">new</span>(<span class="ident">Delimiter</span>::<span class="ident">Parenthesis</span>, <span class="macro">quote</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>))) };
([$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>]) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Group</span>::<span class="ident">new</span>(<span class="ident">Delimiter</span>::<span class="ident">Bracket</span>, <span class="macro">quote</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>))) };
({$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>}) <span class="op">=></span> { <span class="macro">tt2ts</span><span class="macro">!</span>(<span class="ident">Group</span>::<span class="ident">new</span>(<span class="ident">Delimiter</span>::<span class="ident">Brace</span>, <span class="macro">quote</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>))) };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> { <span class="macro">quote_tok</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) };
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">quote</span> {
() <span class="op">=></span> { <span class="ident">TokenStream</span>::<span class="ident">new</span>() };
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> {
[$(<span class="macro">quote_tree</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>),)<span class="kw-2">*</span>].<span class="ident">iter</span>()
.<span class="ident">cloned</span>()
.<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">into_iter</span>())
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">TokenStream</span><span class="op">></span>()
};
}
<span class="kw">impl</span> <span class="ident">ProcMacro</span> <span class="kw">for</span> <span class="ident">Quoter</span> {
<span class="kw">fn</span> <span class="ident">expand</span><span class="op"><</span><span class="lifetime">'cx</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="lifetime">'cx</span> <span class="kw-2">mut</span> <span class="ident">ExtCtxt</span>,
<span class="kw">_</span>: ::<span class="ident">syntax_pos</span>::<span class="ident">Span</span>,
<span class="ident">stream</span>: <span class="ident">tokenstream</span>::<span class="ident">TokenStream</span>)
<span class="op">-></span> <span class="ident">tokenstream</span>::<span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">info</span> <span class="op">=</span> <span class="ident">cx</span>.<span class="ident">current_expansion</span>.<span class="ident">mark</span>.<span class="ident">expn_info</span>().<span class="ident">unwrap</span>();
<span class="ident">info</span>.<span class="ident">callee</span>.<span class="ident">allow_internal_unstable</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="ident">cx</span>.<span class="ident">current_expansion</span>.<span class="ident">mark</span>.<span class="ident">set_expn_info</span>(<span class="ident">info</span>);
::<span class="ident">__internal</span>::<span class="ident">set_sess</span>(<span class="ident">cx</span>, <span class="op">||</span> <span class="ident">TokenStream</span>(<span class="ident">stream</span>).<span class="ident">quote</span>().<span class="number">0</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Quote</span><span class="op">></span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="ident">quote</span> <span class="ident">t</span>))),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(<span class="prelude-val">None</span>),
}
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">TokenStream</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() {
<span class="kw">return</span> <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenStream</span>::<span class="ident">new</span>());
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">after_dollar</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">let</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">into_iter</span>().<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">tree</span><span class="op">|</span> {
<span class="kw">if</span> <span class="ident">after_dollar</span> {
<span class="ident">after_dollar</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">match</span> <span class="ident">tree</span> {
<span class="ident">TokenTree</span>::<span class="ident">Ident</span>(<span class="kw">_</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">tree</span> <span class="op">=</span> <span class="ident">TokenStream</span>::<span class="ident">from</span>(<span class="ident">tree</span>);
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">__internal</span>::<span class="ident">unquote</span>(<span class="kw-2">&</span>(<span class="ident">unquote</span> <span class="ident">tree</span>)),));
}
<span class="ident">TokenTree</span>::<span class="ident">Punct</span>(<span class="kw-2">ref</span> <span class="ident">tt</span>) <span class="kw">if</span> <span class="ident">tt</span>.<span class="ident">as_char</span>() <span class="op">==</span> <span class="string">'$'</span> <span class="op">=></span> {}
<span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"`$` must be followed by an ident or `$` in `quote!`"</span>),
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TokenTree</span>::<span class="ident">Punct</span>(<span class="kw-2">ref</span> <span class="ident">tt</span>) <span class="op">=</span> <span class="ident">tree</span> {
<span class="kw">if</span> <span class="ident">tt</span>.<span class="ident">as_char</span>() <span class="op">==</span> <span class="string">'$'</span> {
<span class="ident">after_dollar</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
}
<span class="prelude-val">Some</span>(<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenStream</span>::<span class="ident">from</span>((<span class="ident">quote</span> <span class="ident">tree</span>)),))
}).<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">t</span>.<span class="ident">into_iter</span>()).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">TokenStream</span><span class="op">></span>();
<span class="kw">if</span> <span class="ident">after_dollar</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"unexpected trailing `$` in `quote!`"</span>);
}
<span class="macro">quote</span><span class="macro">!</span>(
[(<span class="ident">unquote</span> <span class="ident">tokens</span>)].<span class="ident">iter</span>()
.<span class="ident">cloned</span>()
.<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">into_iter</span>())
.<span class="ident">collect</span>::<span class="op"><</span>::<span class="ident">TokenStream</span><span class="op">></span>()
)
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">TokenTree</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="ident">TokenTree</span>::<span class="ident">Punct</span>(<span class="ident">tt</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenTree</span>::<span class="ident">Punct</span>( (<span class="ident">quote</span> <span class="ident">tt</span>) )),
<span class="ident">TokenTree</span>::<span class="ident">Group</span>(<span class="ident">tt</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenTree</span>::<span class="ident">Group</span>( (<span class="ident">quote</span> <span class="ident">tt</span>) )),
<span class="ident">TokenTree</span>::<span class="ident">Ident</span>(<span class="ident">tt</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenTree</span>::<span class="ident">Ident</span>( (<span class="ident">quote</span> <span class="ident">tt</span>) )),
<span class="ident">TokenTree</span>::<span class="ident">Literal</span>(<span class="ident">tt</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">TokenTree</span>::<span class="ident">Literal</span>( (<span class="ident">quote</span> <span class="ident">tt</span>) )),
}
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="ident">Literal</span>::<span class="ident">character</span>(<span class="self">self</span>)).<span class="ident">into</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="ident">Literal</span>::<span class="ident">string</span>(<span class="self">self</span>)).<span class="ident">into</span>()
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">u16</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="ident">TokenTree</span>::<span class="ident">from</span>(<span class="ident">Literal</span>::<span class="ident">u16_unsuffixed</span>(<span class="self">self</span>)).<span class="ident">into</span>()
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Group</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Group</span>::<span class="ident">new</span>((<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">delimiter</span>()), (<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">stream</span>())))
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Punct</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Punct</span>::<span class="ident">new</span>((<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">as_char</span>()), (<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">spacing</span>())))
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Ident</span>::<span class="ident">new</span>((<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">sym</span>.<span class="ident">as_str</span>()), (<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">span</span>())))
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Span</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Span</span>::<span class="ident">def_site</span>())
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">literals</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>; $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=></span> {
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SpannedSymbol</span> {
<span class="ident">sym</span>: <span class="ident">Symbol</span>,
<span class="ident">span</span>: <span class="ident">Span</span>,
}
<span class="kw">impl</span> <span class="ident">SpannedSymbol</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">string</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">span</span>: <span class="ident">Span</span>) <span class="op">-></span> <span class="ident">SpannedSymbol</span> {
<span class="ident">SpannedSymbol</span> { <span class="ident">sym</span>: <span class="ident">Symbol</span>::<span class="ident">intern</span>(<span class="ident">string</span>), <span class="ident">span</span> }
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">SpannedSymbol</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">__internal</span>::<span class="ident">SpannedSymbol</span>::<span class="ident">new</span>((<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">sym</span>.<span class="ident">as_str</span>()),
(<span class="ident">quote</span> <span class="self">self</span>.<span class="ident">span</span>)))
}
}
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LiteralKind</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>,)<span class="op">*</span>
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">u16</span>),)<span class="op">*</span>
}
<span class="kw">impl</span> <span class="ident">LiteralKind</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_contents_and_suffix</span>(<span class="self">self</span>, <span class="ident">contents</span>: <span class="ident">SpannedSymbol</span>,
<span class="ident">suffix</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SpannedSymbol</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Literal</span> {
<span class="kw">let</span> <span class="ident">sym</span> <span class="op">=</span> <span class="ident">contents</span>.<span class="ident">sym</span>;
<span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">suffix</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">t</span>.<span class="ident">sym</span>);
<span class="kw">match</span> <span class="self">self</span> {
$(<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> <span class="op">=></span> {
<span class="ident">Literal</span> {
<span class="ident">lit</span>: <span class="ident">token</span>::<span class="ident">Lit</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>(<span class="ident">sym</span>),
<span class="ident">suffix</span>,
<span class="ident">span</span>: <span class="ident">contents</span>.<span class="ident">span</span>,
}
})<span class="op">*</span>
$(<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="ident">Literal</span> {
<span class="ident">lit</span>: <span class="ident">token</span>::<span class="ident">Lit</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">sym</span>, <span class="ident">n</span>),
<span class="ident">suffix</span>,
<span class="ident">span</span>: <span class="ident">contents</span>.<span class="ident">span</span>,
}
})<span class="op">*</span>
}
}
}
<span class="kw">impl</span> <span class="ident">Literal</span> {
<span class="kw">fn</span> <span class="ident">kind_contents_and_suffix</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="ident">LiteralKind</span>, <span class="ident">SpannedSymbol</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SpannedSymbol</span><span class="op">></span>)
{
<span class="kw">let</span> (<span class="ident">kind</span>, <span class="ident">contents</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">lit</span> {
$(<span class="ident">token</span>::<span class="ident">Lit</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>(<span class="ident">contents</span>) <span class="op">=></span> (<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>, <span class="ident">contents</span>),)<span class="op">*</span>
$(<span class="ident">token</span>::<span class="ident">Lit</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">contents</span>, <span class="ident">n</span>) <span class="op">=></span> (<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">n</span>), <span class="ident">contents</span>),)<span class="op">*</span>
};
<span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">suffix</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">sym</span><span class="op">|</span> <span class="ident">SpannedSymbol</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">sym</span>.<span class="ident">as_str</span>(), <span class="self">self</span>.<span class="ident">span</span>()));
(<span class="ident">kind</span>, <span class="ident">SpannedSymbol</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">contents</span>.<span class="ident">as_str</span>(), <span class="self">self</span>.<span class="ident">span</span>()), <span class="ident">suffix</span>)
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">LiteralKind</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="kw">match</span> <span class="self">self</span> {
$(<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span> {
::<span class="ident">__internal</span>::<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>
},)<span class="op">*</span>
$(<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="macro">quote</span><span class="macro">!</span> {
::<span class="ident">__internal</span>::<span class="ident">LiteralKind</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">raw</span>((<span class="ident">quote</span> <span class="ident">n</span>))
},)<span class="op">*</span>
}
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Literal</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> (<span class="ident">kind</span>, <span class="ident">contents</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">kind_contents_and_suffix</span>();
<span class="macro">quote</span><span class="macro">!</span> {
(<span class="ident">quote</span> <span class="ident">kind</span>).<span class="ident">with_contents_and_suffix</span>((<span class="ident">quote</span> <span class="ident">contents</span>), (<span class="ident">quote</span> <span class="ident">suffix</span>))
}
}
}
}
}
<span class="macro">literals</span><span class="macro">!</span>(<span class="ident">Byte</span>, <span class="ident">Char</span>, <span class="ident">Float</span>, <span class="ident">Str_</span>, <span class="ident">Integer</span>, <span class="ident">ByteStr</span>; <span class="ident">StrRaw</span>, <span class="ident">ByteStrRaw</span>);
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Delimiter</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">gen_match</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="self">self</span> {
$(<span class="ident">Delimiter</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> <span class="op">=></span> { <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Delimiter</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>) })<span class="op">*</span>
}
}
}
<span class="macro">gen_match</span><span class="macro">!</span>(<span class="ident">Parenthesis</span>, <span class="ident">Brace</span>, <span class="ident">Bracket</span>, <span class="prelude-val">None</span>)
}
}
<span class="kw">impl</span> <span class="ident">Quote</span> <span class="kw">for</span> <span class="ident">Spacing</span> {
<span class="kw">fn</span> <span class="ident">quote</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">TokenStream</span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">gen_match</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="self">self</span> {
$(<span class="ident">Spacing</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> <span class="op">=></span> { <span class="macro">quote</span><span class="macro">!</span>(::<span class="ident">Spacing</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>) })<span class="op">*</span>
}
}
}
<span class="macro">gen_match</span><span class="macro">!</span>(<span class="ident">Alone</span>, <span class="ident">Joint</span>)
}
}
</pre>
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