| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-2.0.18/src/tt.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>tt.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../syn/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>proc_macro2::{Delimiter, TokenStream, TokenTree}; |
| <span class="kw">use </span>std::hash::{Hash, Hasher}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TokenTreeHelper<<span class="lifetime">'a</span>>(<span class="kw">pub </span><span class="kw-2">&</span><span class="lifetime">'a </span>TokenTree); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> PartialEq <span class="kw">for </span>TokenTreeHelper<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw">use </span>proc_macro2::Spacing; |
| |
| <span class="kw">match </span>(<span class="self">self</span>.<span class="number">0</span>, other.<span class="number">0</span>) { |
| (TokenTree::Group(g1), TokenTree::Group(g2)) => { |
| <span class="kw">match </span>(g1.delimiter(), g2.delimiter()) { |
| (Delimiter::Parenthesis, Delimiter::Parenthesis) |
| | (Delimiter::Brace, Delimiter::Brace) |
| | (Delimiter::Bracket, Delimiter::Bracket) |
| | (Delimiter::None, Delimiter::None) => {} |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| } |
| |
| <span class="kw">let </span>s1 = g1.stream().into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>s2 = g2.stream().into_iter(); |
| |
| <span class="kw">for </span>item1 <span class="kw">in </span>s1 { |
| <span class="kw">let </span>item2 = <span class="kw">match </span>s2.next() { |
| <span class="prelude-val">Some</span>(item) => item, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| }; |
| <span class="kw">if </span>TokenTreeHelper(<span class="kw-2">&</span>item1) != TokenTreeHelper(<span class="kw-2">&</span>item2) { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| s2.next().is_none() |
| } |
| (TokenTree::Punct(o1), TokenTree::Punct(o2)) => { |
| o1.as_char() == o2.as_char() |
| && <span class="kw">match </span>(o1.spacing(), o2.spacing()) { |
| (Spacing::Alone, Spacing::Alone) | (Spacing::Joint, Spacing::Joint) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| (TokenTree::Literal(l1), TokenTree::Literal(l2)) => l1.to_string() == l2.to_string(), |
| (TokenTree::Ident(s1), TokenTree::Ident(s2)) => s1 == s2, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Hash <span class="kw">for </span>TokenTreeHelper<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, h: <span class="kw-2">&mut </span>H) { |
| <span class="kw">use </span>proc_macro2::Spacing; |
| |
| <span class="kw">match </span><span class="self">self</span>.<span class="number">0 </span>{ |
| TokenTree::Group(g) => { |
| <span class="number">0u8</span>.hash(h); |
| <span class="kw">match </span>g.delimiter() { |
| Delimiter::Parenthesis => <span class="number">0u8</span>.hash(h), |
| Delimiter::Brace => <span class="number">1u8</span>.hash(h), |
| Delimiter::Bracket => <span class="number">2u8</span>.hash(h), |
| Delimiter::None => <span class="number">3u8</span>.hash(h), |
| } |
| |
| <span class="kw">for </span>item <span class="kw">in </span>g.stream() { |
| TokenTreeHelper(<span class="kw-2">&</span>item).hash(h); |
| } |
| <span class="number">0xffu8</span>.hash(h); <span class="comment">// terminator w/ a variant we don't normally hash |
| </span>} |
| TokenTree::Punct(op) => { |
| <span class="number">1u8</span>.hash(h); |
| op.as_char().hash(h); |
| <span class="kw">match </span>op.spacing() { |
| Spacing::Alone => <span class="number">0u8</span>.hash(h), |
| Spacing::Joint => <span class="number">1u8</span>.hash(h), |
| } |
| } |
| TokenTree::Literal(lit) => (<span class="number">2u8</span>, lit.to_string()).hash(h), |
| TokenTree::Ident(word) => (<span class="number">3u8</span>, word).hash(h), |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TokenStreamHelper<<span class="lifetime">'a</span>>(<span class="kw">pub </span><span class="kw-2">&</span><span class="lifetime">'a </span>TokenStream); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> PartialEq <span class="kw">for </span>TokenStreamHelper<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw">let </span>left = <span class="self">self</span>.<span class="number">0</span>.clone().into_iter().collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">let </span>right = other.<span class="number">0</span>.clone().into_iter().collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">if </span>left.len() != right.len() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">for </span>(a, b) <span class="kw">in </span>left.into_iter().zip(right) { |
| <span class="kw">if </span>TokenTreeHelper(<span class="kw-2">&</span>a) != TokenTreeHelper(<span class="kw-2">&</span>b) { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Hash <span class="kw">for </span>TokenStreamHelper<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <span class="kw">let </span>tts = <span class="self">self</span>.<span class="number">0</span>.clone().into_iter().collect::<Vec<<span class="kw">_</span>>>(); |
| tts.len().hash(state); |
| <span class="kw">for </span>tt <span class="kw">in </span>tts { |
| TokenTreeHelper(<span class="kw-2">&</span>tt).hash(state); |
| } |
| } |
| } |
| </code></pre></div> |
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