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<!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/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-1.0.20/src/format.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>format.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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" 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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../quote/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
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</pre><pre class="rust"><code><span class="doccomment">/// Formatting macro for constructing `Ident`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// <br></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Syntax</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Syntax is copied from the [`format!`] macro, supporting both positional and</span>
<span class="doccomment">/// named arguments.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Only a limited set of formatting traits are supported. The current mapping</span>
<span class="doccomment">/// of format types to traits is:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `{}` ⇒ [`IdentFragment`]</span>
<span class="doccomment">/// * `{:o}` ⇒ [`Octal`](std::fmt::Octal)</span>
<span class="doccomment">/// * `{:x}` ⇒ [`LowerHex`](std::fmt::LowerHex)</span>
<span class="doccomment">/// * `{:X}` ⇒ [`UpperHex`](std::fmt::UpperHex)</span>
<span class="doccomment">/// * `{:b}` ⇒ [`Binary`](std::fmt::Binary)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`std::fmt`] for more information.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// <br></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # IdentFragment</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike `format!`, this macro uses the [`IdentFragment`] formatting trait by</span>
<span class="doccomment">/// default. This trait is like `Display`, with a few differences:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `IdentFragment` is only implemented for a limited set of types, such as</span>
<span class="doccomment">/// unsigned integers and strings.</span>
<span class="doccomment">/// * [`Ident`] arguments will have their `r#` prefixes stripped, if present.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`IdentFragment`]: crate::IdentFragment</span>
<span class="doccomment">/// [`Ident`]: proc_macro2::Ident</span>
<span class="doccomment">///</span>
<span class="doccomment">/// <br></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Hygiene</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`Span`] of the first `Ident` argument is used as the span of the final</span>
<span class="doccomment">/// identifier, falling back to [`Span::call_site`] when no identifiers are</span>
<span class="doccomment">/// provided.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::format_ident;</span>
<span class="doccomment">/// # let ident = format_ident!("Ident");</span>
<span class="doccomment">/// // If `ident` is an Ident, the span of `my_ident` will be inherited from it.</span>
<span class="doccomment">/// let my_ident = format_ident!("My{}{}", ident, "IsCool");</span>
<span class="doccomment">/// assert_eq!(my_ident, "MyIdentIsCool");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Alternatively, the span can be overridden by passing the `span` named</span>
<span class="doccomment">/// argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::format_ident;</span>
<span class="doccomment">/// # const IGNORE_TOKENS: &'static str = stringify! {</span>
<span class="doccomment">/// let my_span = /* ... */;</span>
<span class="doccomment">/// # };</span>
<span class="doccomment">/// # let my_span = proc_macro2::Span::call_site();</span>
<span class="doccomment">/// format_ident!("MyIdent", span = my_span);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Span`]: proc_macro2::Span</span>
<span class="doccomment">/// [`Span::call_site`]: proc_macro2::Span::call_site</span>
<span class="doccomment">///</span>
<span class="doccomment">/// <p><br></p></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will panic if the resulting formatted string is not a valid</span>
<span class="doccomment">/// identifier.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// <br></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Composing raw and non-raw identifiers:</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::format_ident;</span>
<span class="doccomment">/// let my_ident = format_ident!("My{}", "Ident");</span>
<span class="doccomment">/// assert_eq!(my_ident, "MyIdent");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let raw = format_ident!("r#Raw");</span>
<span class="doccomment">/// assert_eq!(raw, "r#Raw");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let my_ident_raw = format_ident!("{}Is{}", my_ident, raw);</span>
<span class="doccomment">/// assert_eq!(my_ident_raw, "MyIdentIsRaw");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Integer formatting options:</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::format_ident;</span>
<span class="doccomment">/// let num: u32 = 10;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let decimal = format_ident!("Id_{}", num);</span>
<span class="doccomment">/// assert_eq!(decimal, "Id_10");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let octal = format_ident!("Id_{:o}", num);</span>
<span class="doccomment">/// assert_eq!(octal, "Id_12");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let binary = format_ident!("Id_{:b}", num);</span>
<span class="doccomment">/// assert_eq!(binary, "Id_1010");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let lower_hex = format_ident!("Id_{:x}", num);</span>
<span class="doccomment">/// assert_eq!(lower_hex, "Id_a");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let upper_hex = format_ident!("Id_{:X}", num);</span>
<span class="doccomment">/// assert_eq!(upper_hex, "Id_A");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules!</span> <span class="ident">format_ident</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Option::None</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>
])
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Option::None</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>
] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>)
};
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="macro">macro_rules!</span> <span class="ident">format_ident_impl</span> {
<span class="comment">// Final state</span>
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>]) => {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::mk_ident</span>(
<span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro">crate::__private::format!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>),
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>,
)
};
<span class="comment">// Span argument</span>
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">old</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="ident">span</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">old</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>] <span class="ident">span</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>,)
};
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">old</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="ident">span</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Option::Some</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Span</span><span class="op">></span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>),
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="op">*</span>
] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>)
};
<span class="comment">// Named argument</span>
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>,)
};
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::IdentFragmentAdapter</span>(<span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>) {
<span class="ident">arg</span> => <span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>.<span class="ident">or</span>(<span class="ident">arg</span>.<span class="ident">span</span>()), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> <span class="op">=</span> <span class="ident">arg</span>] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>),
}
};
<span class="comment">// Positional argument</span>
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>,)
};
([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::IdentFragmentAdapter</span>(<span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>) {
<span class="ident">arg</span> => <span class="macro-nonterminal">$</span><span class="macro">crate::format_ident_impl!</span>([<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span>.<span class="ident">or</span>(<span class="ident">arg</span>.<span class="ident">span</span>()), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)<span class="kw-2">*</span>, <span class="ident">arg</span>] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>),
}
};
}
</code></pre></div>
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