57 lines
7.2 KiB
HTML
57 lines
7.2 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/executor.rs`."><title>executor.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>executor.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span>proc_macro::TokenStream;
|
|
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span>proc_macro2::Span;
|
|
<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span>quote::{quote, quote_spanned, ToTokens};
|
|
<a href=#4 id=4 data-nosnippet>4</a>
|
|
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>test(args: TokenStream, item: TokenStream) -> TokenStream {
|
|
<a href=#6 id=6 data-nosnippet>6</a> <span class="kw">if </span>!args.is_empty() {
|
|
<a href=#7 id=7 data-nosnippet>7</a> <span class="kw">return </span>syn::Error::new_spanned(proc_macro2::TokenStream::from(args), <span class="string">"invalid argument"</span>)
|
|
<a href=#8 id=8 data-nosnippet>8</a> .to_compile_error()
|
|
<a href=#9 id=9 data-nosnippet>9</a> .into();
|
|
<a href=#10 id=10 data-nosnippet>10</a> }
|
|
<a href=#11 id=11 data-nosnippet>11</a>
|
|
<a href=#12 id=12 data-nosnippet>12</a> <span class="kw">let </span><span class="kw-2">mut </span>input = <span class="macro">syn::parse_macro_input!</span>(item <span class="kw">as </span>syn::ItemFn);
|
|
<a href=#13 id=13 data-nosnippet>13</a>
|
|
<a href=#14 id=14 data-nosnippet>14</a> <span class="kw">if </span>input.sig.asyncness.take().is_none() {
|
|
<a href=#15 id=15 data-nosnippet>15</a> <span class="kw">return </span>syn::Error::new_spanned(input.sig.fn_token, <span class="string">"Only async functions are supported"</span>)
|
|
<a href=#16 id=16 data-nosnippet>16</a> .to_compile_error()
|
|
<a href=#17 id=17 data-nosnippet>17</a> .into();
|
|
<a href=#18 id=18 data-nosnippet>18</a> }
|
|
<a href=#19 id=19 data-nosnippet>19</a>
|
|
<a href=#20 id=20 data-nosnippet>20</a> <span class="comment">// If type mismatch occurs, the current rustc points to the last statement.
|
|
<a href=#21 id=21 data-nosnippet>21</a> </span><span class="kw">let </span>(last_stmt_start_span, last_stmt_end_span) = {
|
|
<a href=#22 id=22 data-nosnippet>22</a> <span class="kw">let </span><span class="kw-2">mut </span>last_stmt = input
|
|
<a href=#23 id=23 data-nosnippet>23</a> .block
|
|
<a href=#24 id=24 data-nosnippet>24</a> .stmts
|
|
<a href=#25 id=25 data-nosnippet>25</a> .last()
|
|
<a href=#26 id=26 data-nosnippet>26</a> .map(ToTokens::into_token_stream)
|
|
<a href=#27 id=27 data-nosnippet>27</a> .unwrap_or_default()
|
|
<a href=#28 id=28 data-nosnippet>28</a> .into_iter();
|
|
<a href=#29 id=29 data-nosnippet>29</a> <span class="comment">// `Span` on stable Rust has a limitation that only points to the first
|
|
<a href=#30 id=30 data-nosnippet>30</a> // token, not the whole tokens. We can work around this limitation by
|
|
<a href=#31 id=31 data-nosnippet>31</a> // using the first/last span of the tokens like
|
|
<a href=#32 id=32 data-nosnippet>32</a> // `syn::Error::new_spanned` does.
|
|
<a href=#33 id=33 data-nosnippet>33</a> </span><span class="kw">let </span>start = last_stmt.next().map_or_else(Span::call_site, |t| t.span());
|
|
<a href=#34 id=34 data-nosnippet>34</a> <span class="kw">let </span>end = last_stmt.last().map_or(start, |t| t.span());
|
|
<a href=#35 id=35 data-nosnippet>35</a> (start, end)
|
|
<a href=#36 id=36 data-nosnippet>36</a> };
|
|
<a href=#37 id=37 data-nosnippet>37</a>
|
|
<a href=#38 id=38 data-nosnippet>38</a> <span class="kw">let </span>path = <span class="macro">quote_spanned!</span> {last_stmt_start_span=>
|
|
<a href=#39 id=39 data-nosnippet>39</a> ::futures_test::__private
|
|
<a href=#40 id=40 data-nosnippet>40</a> };
|
|
<a href=#41 id=41 data-nosnippet>41</a> <span class="kw">let </span>body = <span class="kw-2">&</span>input.block;
|
|
<a href=#42 id=42 data-nosnippet>42</a> input.block.stmts = <span class="macro">vec!</span>[syn::Stmt::Expr(
|
|
<a href=#43 id=43 data-nosnippet>43</a> syn::parse2(<span class="macro">quote_spanned!</span> {last_stmt_end_span=>
|
|
<a href=#44 id=44 data-nosnippet>44</a> #path::block_on(<span class="kw">async </span>#body)
|
|
<a href=#45 id=45 data-nosnippet>45</a> })
|
|
<a href=#46 id=46 data-nosnippet>46</a> .unwrap(),
|
|
<a href=#47 id=47 data-nosnippet>47</a> <span class="prelude-val">None</span>,
|
|
<a href=#48 id=48 data-nosnippet>48</a> )];
|
|
<a href=#49 id=49 data-nosnippet>49</a>
|
|
<a href=#50 id=50 data-nosnippet>50</a> <span class="kw">let gen </span>= <span class="macro">quote!</span> {
|
|
<a href=#51 id=51 data-nosnippet>51</a> <span class="attr">#[::core::prelude::v1::test]
|
|
<a href=#52 id=52 data-nosnippet>52</a> </span>#input
|
|
<a href=#53 id=53 data-nosnippet>53</a> };
|
|
<a href=#54 id=54 data-nosnippet>54</a>
|
|
<a href=#55 id=55 data-nosnippet>55</a> <span class="kw">gen</span>.into()
|
|
<a href=#56 id=56 data-nosnippet>56</a>}
|
|
</code></pre></div></section></main></body></html> |