| <!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/serde_derive-1.0.163/src/fragment.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fragment.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="../../serde_derive/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="../../serde_derive/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::TokenStream; |
| <span class="kw">use </span>quote::ToTokens; |
| <span class="kw">use </span>syn::token; |
| |
| <span class="kw">pub enum </span>Fragment { |
| <span class="doccomment">/// Tokens that can be used as an expression. |
| </span>Expr(TokenStream), |
| <span class="doccomment">/// Tokens that can be used inside a block. The surrounding curly braces are |
| /// not part of these tokens. |
| </span>Block(TokenStream), |
| } |
| |
| <span class="macro">macro_rules! </span>quote_expr { |
| ($(<span class="macro-nonterminal">$tt</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro-nonterminal">$crate::fragment::Fragment::Expr</span>(<span class="macro">quote!</span>($(<span class="macro-nonterminal">$tt</span>)<span class="kw-2">*</span>)) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>quote_block { |
| ($(<span class="macro-nonterminal">$tt</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro-nonterminal">$crate::fragment::Fragment::Block</span>(<span class="macro">quote!</span>($(<span class="macro-nonterminal">$tt</span>)<span class="kw-2">*</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// Interpolate a fragment in place of an expression. This involves surrounding |
| /// Block fragments in curly braces. |
| </span><span class="kw">pub struct </span>Expr(<span class="kw">pub </span>Fragment); |
| <span class="kw">impl </span>ToTokens <span class="kw">for </span>Expr { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, out: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>{ |
| Fragment::Expr(expr) => expr.to_tokens(out), |
| Fragment::Block(block) => { |
| token::Brace::default().surround(out, |out| block.to_tokens(out)); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Interpolate a fragment as the statements of a block. |
| </span><span class="kw">pub struct </span>Stmts(<span class="kw">pub </span>Fragment); |
| <span class="kw">impl </span>ToTokens <span class="kw">for </span>Stmts { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, out: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>{ |
| Fragment::Expr(expr) => expr.to_tokens(out), |
| Fragment::Block(block) => block.to_tokens(out), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Interpolate a fragment as the value part of a `match` expression. This |
| /// involves putting a comma after expressions and curly braces around blocks. |
| </span><span class="kw">pub struct </span>Match(<span class="kw">pub </span>Fragment); |
| <span class="kw">impl </span>ToTokens <span class="kw">for </span>Match { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, out: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>{ |
| Fragment::Expr(expr) => { |
| expr.to_tokens(out); |
| <<span class="macro">Token!</span>[,]>::default().to_tokens(out); |
| } |
| Fragment::Block(block) => { |
| token::Brace::default().surround(out, |out| block.to_tokens(out)); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>AsRef<TokenStream> <span class="kw">for </span>Fragment { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>TokenStream { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fragment::Expr(expr) => expr, |
| Fragment::Block(block) => block, |
| } |
| } |
| } |
| </code></pre></div> |
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