| <!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/proc-macro2-1.0.59/src/wrapper.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>wrapper.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="../../proc_macro2/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="../../proc_macro2/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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| <span id="982">982</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::detection::inside_proc_macro; |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::location::LineColumn; |
| <span class="kw">use crate</span>::{fallback, Delimiter, Punct, Spacing, TokenTree}; |
| <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display}; |
| <span class="kw">use </span>core::iter::FromIterator; |
| <span class="kw">use </span>core::ops::RangeBounds; |
| <span class="kw">use </span>core::str::FromStr; |
| <span class="kw">use </span>std::panic; |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">use </span>std::path::PathBuf; |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>TokenStream { |
| Compiler(DeferredTokenStream), |
| Fallback(fallback::TokenStream), |
| } |
| |
| <span class="comment">// Work around https://github.com/rust-lang/rust/issues/65080. |
| // In `impl Extend<TokenTree> for TokenStream` which is used heavily by quote, |
| // we hold on to the appended tokens and do proc_macro::TokenStream::extend as |
| // late as possible to batch together consecutive uses of the Extend impl. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>DeferredTokenStream { |
| stream: proc_macro::TokenStream, |
| extra: Vec<proc_macro::TokenTree>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>LexError { |
| Compiler(proc_macro::LexError), |
| Fallback(fallback::LexError), |
| } |
| |
| <span class="kw">impl </span>LexError { |
| <span class="kw">fn </span>call_site() -> <span class="self">Self </span>{ |
| LexError::Fallback(fallback::LexError { |
| span: fallback::Span::call_site(), |
| }) |
| } |
| } |
| |
| <span class="kw">fn </span>mismatch() -> ! { |
| <span class="macro">panic!</span>(<span class="string">"compiler/fallback mismatch"</span>) |
| } |
| |
| <span class="kw">impl </span>DeferredTokenStream { |
| <span class="kw">fn </span>new(stream: proc_macro::TokenStream) -> <span class="self">Self </span>{ |
| DeferredTokenStream { |
| stream, |
| extra: Vec::new(), |
| } |
| } |
| |
| <span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.stream.is_empty() && <span class="self">self</span>.extra.is_empty() |
| } |
| |
| <span class="kw">fn </span>evaluate_now(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// If-check provides a fast short circuit for the common case of `extra` |
| // being empty, which saves a round trip over the proc macro bridge. |
| // Improves macro expansion time in winrt by 6% in debug mode. |
| </span><span class="kw">if </span>!<span class="self">self</span>.extra.is_empty() { |
| <span class="self">self</span>.stream.extend(<span class="self">self</span>.extra.drain(..)); |
| } |
| } |
| |
| <span class="kw">fn </span>into_token_stream(<span class="kw-2">mut </span><span class="self">self</span>) -> proc_macro::TokenStream { |
| <span class="self">self</span>.evaluate_now(); |
| <span class="self">self</span>.stream |
| } |
| } |
| |
| <span class="kw">impl </span>TokenStream { |
| <span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new(proc_macro::TokenStream::new())) |
| } <span class="kw">else </span>{ |
| TokenStream::Fallback(fallback::TokenStream::new()) |
| } |
| } |
| |
| <span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => tts.is_empty(), |
| TokenStream::Fallback(tts) => tts.is_empty(), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::TokenStream { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(s) => s.into_token_stream(), |
| TokenStream::Fallback(<span class="kw">_</span>) => mismatch(), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_stable(<span class="self">self</span>) -> fallback::TokenStream { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(<span class="kw">_</span>) => mismatch(), |
| TokenStream::Fallback(s) => s, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>FromStr <span class="kw">for </span>TokenStream { |
| <span class="kw">type </span><span class="prelude-val">Err </span>= LexError; |
| |
| <span class="kw">fn </span>from_str(src: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><TokenStream, LexError> { |
| <span class="kw">if </span>inside_proc_macro() { |
| <span class="prelude-val">Ok</span>(TokenStream::Compiler(DeferredTokenStream::new( |
| proc_macro_parse(src)<span class="question-mark">?</span>, |
| ))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(TokenStream::Fallback(src.parse()<span class="question-mark">?</span>)) |
| } |
| } |
| } |
| |
| <span class="comment">// Work around https://github.com/rust-lang/rust/issues/58736. |
| </span><span class="kw">fn </span>proc_macro_parse(src: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><proc_macro::TokenStream, LexError> { |
| <span class="kw">let </span>result = panic::catch_unwind(|| src.parse().map_err(LexError::Compiler)); |
| result.unwrap_or_else(|<span class="kw">_</span>| <span class="prelude-val">Err</span>(LexError::call_site())) |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => Display::fmt(<span class="kw-2">&</span>tts.clone().into_token_stream(), f), |
| TokenStream::Fallback(tts) => Display::fmt(tts, f), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<proc_macro::TokenStream> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>from(inner: proc_macro::TokenStream) -> <span class="self">Self </span>{ |
| TokenStream::Compiler(DeferredTokenStream::new(inner)) |
| } |
| } |
| |
| <span class="kw">impl </span>From<TokenStream> <span class="kw">for </span>proc_macro::TokenStream { |
| <span class="kw">fn </span>from(inner: TokenStream) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>inner { |
| TokenStream::Compiler(inner) => inner.into_token_stream(), |
| TokenStream::Fallback(inner) => inner.to_string().parse().unwrap(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<fallback::TokenStream> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>from(inner: fallback::TokenStream) -> <span class="self">Self </span>{ |
| TokenStream::Fallback(inner) |
| } |
| } |
| |
| <span class="comment">// Assumes inside_proc_macro(). |
| </span><span class="kw">fn </span>into_compiler_token(token: TokenTree) -> proc_macro::TokenTree { |
| <span class="kw">match </span>token { |
| TokenTree::Group(tt) => tt.inner.unwrap_nightly().into(), |
| TokenTree::Punct(tt) => { |
| <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() { |
| Spacing::Joint => proc_macro::Spacing::Joint, |
| Spacing::Alone => proc_macro::Spacing::Alone, |
| }; |
| <span class="kw">let </span><span class="kw-2">mut </span>punct = proc_macro::Punct::new(tt.as_char(), spacing); |
| punct.set_span(tt.span().inner.unwrap_nightly()); |
| punct.into() |
| } |
| TokenTree::Ident(tt) => tt.inner.unwrap_nightly().into(), |
| TokenTree::Literal(tt) => tt.inner.unwrap_nightly().into(), |
| } |
| } |
| |
| <span class="kw">impl </span>From<TokenTree> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>from(token: TokenTree) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new(into_compiler_token(token).into())) |
| } <span class="kw">else </span>{ |
| TokenStream::Fallback(token.into()) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>FromIterator<TokenTree> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new( |
| trees.into_iter().map(into_compiler_token).collect(), |
| )) |
| } <span class="kw">else </span>{ |
| TokenStream::Fallback(trees.into_iter().collect()) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>FromIterator<TokenStream> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>streams = streams.into_iter(); |
| <span class="kw">match </span>streams.next() { |
| <span class="prelude-val">Some</span>(TokenStream::Compiler(<span class="kw-2">mut </span>first)) => { |
| first.evaluate_now(); |
| first.stream.extend(streams.map(|s| <span class="kw">match </span>s { |
| TokenStream::Compiler(s) => s.into_token_stream(), |
| TokenStream::Fallback(<span class="kw">_</span>) => mismatch(), |
| })); |
| TokenStream::Compiler(first) |
| } |
| <span class="prelude-val">Some</span>(TokenStream::Fallback(<span class="kw-2">mut </span>first)) => { |
| first.extend(streams.map(|s| <span class="kw">match </span>s { |
| TokenStream::Fallback(s) => s, |
| TokenStream::Compiler(<span class="kw">_</span>) => mismatch(), |
| })); |
| TokenStream::Fallback(first) |
| } |
| <span class="prelude-val">None </span>=> TokenStream::new(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Extend<TokenTree> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>extend<I: IntoIterator<Item = TokenTree>>(<span class="kw-2">&mut </span><span class="self">self</span>, stream: I) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => { |
| <span class="comment">// Here is the reason for DeferredTokenStream. |
| </span><span class="kw">for </span>token <span class="kw">in </span>stream { |
| tts.extra.push(into_compiler_token(token)); |
| } |
| } |
| TokenStream::Fallback(tts) => tts.extend(stream), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Extend<TokenStream> <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>extend<I: IntoIterator<Item = TokenStream>>(<span class="kw-2">&mut </span><span class="self">self</span>, streams: I) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => { |
| tts.evaluate_now(); |
| tts.stream |
| .extend(streams.into_iter().map(TokenStream::unwrap_nightly)); |
| } |
| TokenStream::Fallback(tts) => { |
| tts.extend(streams.into_iter().map(TokenStream::unwrap_stable)); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>TokenStream { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => Debug::fmt(<span class="kw-2">&</span>tts.clone().into_token_stream(), f), |
| TokenStream::Fallback(tts) => Debug::fmt(tts, f), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>LexError { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| LexError::Compiler(<span class="kw">_</span>) => Span::call_site(), |
| LexError::Fallback(e) => Span::Fallback(e.span()), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<proc_macro::LexError> <span class="kw">for </span>LexError { |
| <span class="kw">fn </span>from(e: proc_macro::LexError) -> <span class="self">Self </span>{ |
| LexError::Compiler(e) |
| } |
| } |
| |
| <span class="kw">impl </span>From<fallback::LexError> <span class="kw">for </span>LexError { |
| <span class="kw">fn </span>from(e: fallback::LexError) -> <span class="self">Self </span>{ |
| LexError::Fallback(e) |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>LexError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| LexError::Compiler(e) => Debug::fmt(e, f), |
| LexError::Fallback(e) => Debug::fmt(e, f), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>LexError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="attribute">#[cfg(not(no_lexerror_display))] |
| </span>LexError::Compiler(e) => Display::fmt(e, f), |
| <span class="attribute">#[cfg(no_lexerror_display)] |
| </span>LexError::Compiler(_e) => Display::fmt( |
| <span class="kw-2">&</span>fallback::LexError { |
| span: fallback::Span::call_site(), |
| }, |
| f, |
| ), |
| LexError::Fallback(e) => Display::fmt(e, f), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>TokenTreeIter { |
| Compiler(proc_macro::token_stream::IntoIter), |
| Fallback(fallback::TokenTreeIter), |
| } |
| |
| <span class="kw">impl </span>IntoIterator <span class="kw">for </span>TokenStream { |
| <span class="kw">type </span>Item = TokenTree; |
| <span class="kw">type </span>IntoIter = TokenTreeIter; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> TokenTreeIter { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenStream::Compiler(tts) => { |
| TokenTreeIter::Compiler(tts.into_token_stream().into_iter()) |
| } |
| TokenStream::Fallback(tts) => TokenTreeIter::Fallback(tts.into_iter()), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Iterator <span class="kw">for </span>TokenTreeIter { |
| <span class="kw">type </span>Item = TokenTree; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><TokenTree> { |
| <span class="kw">let </span>token = <span class="kw">match </span><span class="self">self </span>{ |
| TokenTreeIter::Compiler(iter) => iter.next()<span class="question-mark">?</span>, |
| TokenTreeIter::Fallback(iter) => <span class="kw">return </span>iter.next(), |
| }; |
| <span class="prelude-val">Some</span>(<span class="kw">match </span>token { |
| proc_macro::TokenTree::Group(tt) => <span class="kw">crate</span>::Group::_new(Group::Compiler(tt)).into(), |
| proc_macro::TokenTree::Punct(tt) => { |
| <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() { |
| proc_macro::Spacing::Joint => Spacing::Joint, |
| proc_macro::Spacing::Alone => Spacing::Alone, |
| }; |
| <span class="kw">let </span><span class="kw-2">mut </span>o = Punct::new(tt.as_char(), spacing); |
| o.set_span(<span class="kw">crate</span>::Span::_new(Span::Compiler(tt.span()))); |
| o.into() |
| } |
| proc_macro::TokenTree::Ident(s) => <span class="kw">crate</span>::Ident::_new(Ident::Compiler(s)).into(), |
| proc_macro::TokenTree::Literal(l) => <span class="kw">crate</span>::Literal::_new(Literal::Compiler(l)).into(), |
| }) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| TokenTreeIter::Compiler(tts) => tts.size_hint(), |
| TokenTreeIter::Fallback(tts) => tts.size_hint(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, PartialEq, Eq)] |
| #[cfg(super_unstable)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>SourceFile { |
| Compiler(proc_macro::SourceFile), |
| Fallback(fallback::SourceFile), |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">impl </span>SourceFile { |
| <span class="kw">fn </span>nightly(sf: proc_macro::SourceFile) -> <span class="self">Self </span>{ |
| SourceFile::Compiler(sf) |
| } |
| |
| <span class="doccomment">/// Get the path to this source file as a string. |
| </span><span class="kw">pub fn </span>path(<span class="kw-2">&</span><span class="self">self</span>) -> PathBuf { |
| <span class="kw">match </span><span class="self">self </span>{ |
| SourceFile::Compiler(a) => a.path(), |
| SourceFile::Fallback(a) => a.path(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>is_real(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| SourceFile::Compiler(a) => a.is_real(), |
| SourceFile::Fallback(a) => a.is_real(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>SourceFile { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| SourceFile::Compiler(a) => Debug::fmt(a, f), |
| SourceFile::Fallback(a) => Debug::fmt(a, f), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Copy, Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Span { |
| Compiler(proc_macro::Span), |
| Fallback(fallback::Span), |
| } |
| |
| <span class="kw">impl </span>Span { |
| <span class="kw">pub fn </span>call_site() -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::call_site()) |
| } <span class="kw">else </span>{ |
| Span::Fallback(fallback::Span::call_site()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(no_hygiene))] |
| </span><span class="kw">pub fn </span>mixed_site() -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::mixed_site()) |
| } <span class="kw">else </span>{ |
| Span::Fallback(fallback::Span::mixed_site()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">pub fn </span>def_site() -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::def_site()) |
| } <span class="kw">else </span>{ |
| Span::Fallback(fallback::Span::def_site()) |
| } |
| } |
| |
| <span class="kw">pub fn </span>resolved_at(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> Span { |
| <span class="kw">match </span>(<span class="self">self</span>, other) { |
| <span class="attribute">#[cfg(not(no_hygiene))] |
| </span>(Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.resolved_at(b)), |
| |
| <span class="comment">// Name resolution affects semantics, but location is only cosmetic |
| </span><span class="attribute">#[cfg(no_hygiene)] |
| </span>(Span::Compiler(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => other, |
| |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.resolved_at(b)), |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>located_at(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> Span { |
| <span class="kw">match </span>(<span class="self">self</span>, other) { |
| <span class="attribute">#[cfg(not(no_hygiene))] |
| </span>(Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.located_at(b)), |
| |
| <span class="comment">// Name resolution affects semantics, but location is only cosmetic |
| </span><span class="attribute">#[cfg(no_hygiene)] |
| </span>(Span::Compiler(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => <span class="kw-2">*</span><span class="self">self</span>, |
| |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.located_at(b)), |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>unwrap(<span class="self">self</span>) -> proc_macro::Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => s, |
| Span::Fallback(<span class="kw">_</span>) => <span class="macro">panic!</span>(<span class="string">"proc_macro::Span is only available in procedural macros"</span>), |
| } |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">pub fn </span>source_file(<span class="kw-2">&</span><span class="self">self</span>) -> SourceFile { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => SourceFile::nightly(s.source_file()), |
| Span::Fallback(s) => SourceFile::Fallback(s.source_file()), |
| } |
| } |
| |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">pub fn </span>start(<span class="kw-2">&</span><span class="self">self</span>) -> LineColumn { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(<span class="kw">_</span>) => LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>}, |
| Span::Fallback(s) => s.start(), |
| } |
| } |
| |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">pub fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> LineColumn { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(<span class="kw">_</span>) => LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>}, |
| Span::Fallback(s) => s.end(), |
| } |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">pub fn </span>before(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => Span::Compiler(s.before()), |
| Span::Fallback(s) => Span::Fallback(s.before()), |
| } |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">pub fn </span>after(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => Span::Compiler(s.after()), |
| Span::Fallback(s) => Span::Fallback(s.after()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>join(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> <span class="prelude-ty">Option</span><Span> { |
| <span class="kw">let </span>ret = <span class="kw">match </span>(<span class="self">self</span>, other) { |
| <span class="attribute">#[cfg(proc_macro_span)] |
| </span>(Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.join(b)<span class="question-mark">?</span>), |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.join(b)<span class="question-mark">?</span>), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| <span class="prelude-val">Some</span>(ret) |
| } |
| |
| <span class="attribute">#[cfg(super_unstable)] |
| </span><span class="kw">pub fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Span) -> bool { |
| <span class="kw">match </span>(<span class="self">self</span>, other) { |
| (Span::Compiler(a), Span::Compiler(b)) => a.eq(b), |
| (Span::Fallback(a), Span::Fallback(b)) => a.eq(b), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>source_text(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="attribute">#[cfg(not(no_source_text))] |
| </span>Span::Compiler(s) => s.source_text(), |
| <span class="attribute">#[cfg(no_source_text)] |
| </span>Span::Compiler(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| Span::Fallback(s) => s.source_text(), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => s, |
| Span::Fallback(<span class="kw">_</span>) => mismatch(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<proc_macro::Span> <span class="kw">for </span><span class="kw">crate</span>::Span { |
| <span class="kw">fn </span>from(proc_span: proc_macro::Span) -> <span class="self">Self </span>{ |
| <span class="kw">crate</span>::Span::_new(Span::Compiler(proc_span)) |
| } |
| } |
| |
| <span class="kw">impl </span>From<fallback::Span> <span class="kw">for </span>Span { |
| <span class="kw">fn </span>from(inner: fallback::Span) -> <span class="self">Self </span>{ |
| Span::Fallback(inner) |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Span { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Span::Compiler(s) => Debug::fmt(s, f), |
| Span::Fallback(s) => Debug::fmt(s, f), |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug_span_field_if_nontrivial(debug: <span class="kw-2">&mut </span>fmt::DebugStruct, span: Span) { |
| <span class="kw">match </span>span { |
| Span::Compiler(s) => { |
| debug.field(<span class="string">"span"</span>, <span class="kw-2">&</span>s); |
| } |
| Span::Fallback(s) => fallback::debug_span_field_if_nontrivial(debug, s), |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Group { |
| Compiler(proc_macro::Group), |
| Fallback(fallback::Group), |
| } |
| |
| <span class="kw">impl </span>Group { |
| <span class="kw">pub fn </span>new(delimiter: Delimiter, stream: TokenStream) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>stream { |
| TokenStream::Compiler(tts) => { |
| <span class="kw">let </span>delimiter = <span class="kw">match </span>delimiter { |
| Delimiter::Parenthesis => proc_macro::Delimiter::Parenthesis, |
| Delimiter::Bracket => proc_macro::Delimiter::Bracket, |
| Delimiter::Brace => proc_macro::Delimiter::Brace, |
| Delimiter::None => proc_macro::Delimiter::None, |
| }; |
| Group::Compiler(proc_macro::Group::new(delimiter, tts.into_token_stream())) |
| } |
| TokenStream::Fallback(stream) => { |
| Group::Fallback(fallback::Group::new(delimiter, stream)) |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>delimiter(<span class="kw-2">&</span><span class="self">self</span>) -> Delimiter { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(g) => <span class="kw">match </span>g.delimiter() { |
| proc_macro::Delimiter::Parenthesis => Delimiter::Parenthesis, |
| proc_macro::Delimiter::Bracket => Delimiter::Bracket, |
| proc_macro::Delimiter::Brace => Delimiter::Brace, |
| proc_macro::Delimiter::None => Delimiter::None, |
| }, |
| Group::Fallback(g) => g.delimiter(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>stream(<span class="kw-2">&</span><span class="self">self</span>) -> TokenStream { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(g) => TokenStream::Compiler(DeferredTokenStream::new(g.stream())), |
| Group::Fallback(g) => TokenStream::Fallback(g.stream()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(g) => Span::Compiler(g.span()), |
| Group::Fallback(g) => Span::Fallback(g.span()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>span_open(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="attribute">#[cfg(not(no_group_open_close))] |
| </span>Group::Compiler(g) => Span::Compiler(g.span_open()), |
| <span class="attribute">#[cfg(no_group_open_close)] |
| </span>Group::Compiler(g) => Span::Compiler(g.span()), |
| Group::Fallback(g) => Span::Fallback(g.span_open()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>span_close(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="attribute">#[cfg(not(no_group_open_close))] |
| </span>Group::Compiler(g) => Span::Compiler(g.span_close()), |
| <span class="attribute">#[cfg(no_group_open_close)] |
| </span>Group::Compiler(g) => Span::Compiler(g.span()), |
| Group::Fallback(g) => Span::Fallback(g.span_close()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="kw">match </span>(<span class="self">self</span>, span) { |
| (Group::Compiler(g), Span::Compiler(s)) => g.set_span(s), |
| (Group::Fallback(g), Span::Fallback(s)) => g.set_span(s), |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Group { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(g) => g, |
| Group::Fallback(<span class="kw">_</span>) => mismatch(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<fallback::Group> <span class="kw">for </span>Group { |
| <span class="kw">fn </span>from(g: fallback::Group) -> <span class="self">Self </span>{ |
| Group::Fallback(g) |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Group { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(group) => Display::fmt(group, formatter), |
| Group::Fallback(group) => Display::fmt(group, formatter), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Group { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Group::Compiler(group) => Debug::fmt(group, formatter), |
| Group::Fallback(group) => Debug::fmt(group, formatter), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Ident { |
| Compiler(proc_macro::Ident), |
| Fallback(fallback::Ident), |
| } |
| |
| <span class="kw">impl </span>Ident { |
| <span class="kw">pub fn </span>new(string: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>span { |
| Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new(string, s)), |
| Span::Fallback(s) => Ident::Fallback(fallback::Ident::new(string, s)), |
| } |
| } |
| |
| <span class="kw">pub fn </span>new_raw(string: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>span { |
| <span class="attribute">#[cfg(not(no_ident_new_raw))] |
| </span>Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new_raw(string, s)), |
| <span class="attribute">#[cfg(no_ident_new_raw)] |
| </span>Span::Compiler(s) => { |
| <span class="kw">let _ </span>= proc_macro::Ident::new(string, s); |
| <span class="comment">// At this point the un-r#-prefixed string is known to be a |
| // valid identifier. Try to produce a valid raw identifier by |
| // running the `TokenStream` parser, and unwrapping the first |
| // token as an `Ident`. |
| </span><span class="kw">let </span>raw_prefixed = <span class="macro">format!</span>(<span class="string">"r#{}"</span>, string); |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(ts) = raw_prefixed.parse::<proc_macro::TokenStream>() { |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = ts.into_iter(); |
| <span class="kw">if let </span>(<span class="prelude-val">Some</span>(proc_macro::TokenTree::Ident(<span class="kw-2">mut </span>id)), <span class="prelude-val">None</span>) = |
| (iter.next(), iter.next()) |
| { |
| id.set_span(s); |
| <span class="kw">return </span>Ident::Compiler(id); |
| } |
| } |
| <span class="macro">panic!</span>(<span class="string">"not allowed as a raw identifier: `{}`"</span>, raw_prefixed) |
| } |
| Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_raw(string, s)), |
| } |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Ident::Compiler(t) => Span::Compiler(t.span()), |
| Ident::Fallback(t) => Span::Fallback(t.span()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="kw">match </span>(<span class="self">self</span>, span) { |
| (Ident::Compiler(t), Span::Compiler(s)) => t.set_span(s), |
| (Ident::Fallback(t), Span::Fallback(s)) => t.set_span(s), |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Ident { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Ident::Compiler(s) => s, |
| Ident::Fallback(<span class="kw">_</span>) => mismatch(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Ident { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Ident) -> bool { |
| <span class="kw">match </span>(<span class="self">self</span>, other) { |
| (Ident::Compiler(t), Ident::Compiler(o)) => t.to_string() == o.to_string(), |
| (Ident::Fallback(t), Ident::Fallback(o)) => t == o, |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> PartialEq<T> <span class="kw">for </span>Ident |
| <span class="kw">where |
| </span>T: <span class="question-mark">?</span>Sized + AsRef<str>, |
| { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>T) -> bool { |
| <span class="kw">let </span>other = other.as_ref(); |
| <span class="kw">match </span><span class="self">self </span>{ |
| Ident::Compiler(t) => t.to_string() == other, |
| Ident::Fallback(t) => t == other, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Ident { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Ident::Compiler(t) => Display::fmt(t, f), |
| Ident::Fallback(t) => Display::fmt(t, f), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Ident { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Ident::Compiler(t) => Debug::fmt(t, f), |
| Ident::Fallback(t) => Debug::fmt(t, f), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Literal { |
| Compiler(proc_macro::Literal), |
| Fallback(fallback::Literal), |
| } |
| |
| <span class="macro">macro_rules! </span>suffixed_numbers { |
| ($(<span class="macro-nonterminal">$name</span>:ident => <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) => ($( |
| <span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::<span class="macro-nonterminal">$name</span>(n)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::<span class="macro-nonterminal">$name</span>(n)) |
| } |
| } |
| )<span class="kw-2">*</span>) |
| } |
| |
| <span class="macro">macro_rules! </span>unsuffixed_integers { |
| ($(<span class="macro-nonterminal">$name</span>:ident => <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) => ($( |
| <span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::<span class="macro-nonterminal">$name</span>(n)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::<span class="macro-nonterminal">$name</span>(n)) |
| } |
| } |
| )<span class="kw-2">*</span>) |
| } |
| |
| <span class="kw">impl </span>Literal { |
| <span class="kw">pub unsafe fn </span>from_str_unchecked(repr: <span class="kw-2">&</span>str) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(compiler_literal_from_str(repr).expect(<span class="string">"invalid literal"</span>)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::from_str_unchecked(repr)) |
| } |
| } |
| |
| <span class="macro">suffixed_numbers! </span>{ |
| u8_suffixed => u8, |
| u16_suffixed => u16, |
| u32_suffixed => u32, |
| u64_suffixed => u64, |
| u128_suffixed => u128, |
| usize_suffixed => usize, |
| i8_suffixed => i8, |
| i16_suffixed => i16, |
| i32_suffixed => i32, |
| i64_suffixed => i64, |
| i128_suffixed => i128, |
| isize_suffixed => isize, |
| |
| f32_suffixed => f32, |
| f64_suffixed => f64, |
| } |
| |
| <span class="macro">unsuffixed_integers! </span>{ |
| u8_unsuffixed => u8, |
| u16_unsuffixed => u16, |
| u32_unsuffixed => u32, |
| u64_unsuffixed => u64, |
| u128_unsuffixed => u128, |
| usize_unsuffixed => usize, |
| i8_unsuffixed => i8, |
| i16_unsuffixed => i16, |
| i32_unsuffixed => i32, |
| i64_unsuffixed => i64, |
| i128_unsuffixed => i128, |
| isize_unsuffixed => isize, |
| } |
| |
| <span class="kw">pub fn </span>f32_unsuffixed(f: f32) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::f32_unsuffixed(f)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::f32_unsuffixed(f)) |
| } |
| } |
| |
| <span class="kw">pub fn </span>f64_unsuffixed(f: f64) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::f64_unsuffixed(f)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::f64_unsuffixed(f)) |
| } |
| } |
| |
| <span class="kw">pub fn </span>string(t: <span class="kw-2">&</span>str) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::string(t)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::string(t)) |
| } |
| } |
| |
| <span class="kw">pub fn </span>character(t: char) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::character(t)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::character(t)) |
| } |
| } |
| |
| <span class="kw">pub fn </span>byte_string(bytes: <span class="kw-2">&</span>[u8]) -> Literal { |
| <span class="kw">if </span>inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::byte_string(bytes)) |
| } <span class="kw">else </span>{ |
| Literal::Fallback(fallback::Literal::byte_string(bytes)) |
| } |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal::Compiler(lit) => Span::Compiler(lit.span()), |
| Literal::Fallback(lit) => Span::Fallback(lit.span()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="kw">match </span>(<span class="self">self</span>, span) { |
| (Literal::Compiler(lit), Span::Compiler(s)) => lit.set_span(s), |
| (Literal::Fallback(lit), Span::Fallback(s)) => lit.set_span(s), |
| <span class="kw">_ </span>=> mismatch(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>subspan<R: RangeBounds<usize>>(<span class="kw-2">&</span><span class="self">self</span>, range: R) -> <span class="prelude-ty">Option</span><Span> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="attribute">#[cfg(proc_macro_span)] |
| </span>Literal::Compiler(lit) => lit.subspan(range).map(Span::Compiler), |
| <span class="attribute">#[cfg(not(proc_macro_span))] |
| </span>Literal::Compiler(_lit) => <span class="prelude-val">None</span>, |
| Literal::Fallback(lit) => lit.subspan(range).map(Span::Fallback), |
| } |
| } |
| |
| <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Literal { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal::Compiler(s) => s, |
| Literal::Fallback(<span class="kw">_</span>) => mismatch(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<fallback::Literal> <span class="kw">for </span>Literal { |
| <span class="kw">fn </span>from(s: fallback::Literal) -> <span class="self">Self </span>{ |
| Literal::Fallback(s) |
| } |
| } |
| |
| <span class="kw">impl </span>FromStr <span class="kw">for </span>Literal { |
| <span class="kw">type </span><span class="prelude-val">Err </span>= LexError; |
| |
| <span class="kw">fn </span>from_str(repr: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> { |
| <span class="kw">if </span>inside_proc_macro() { |
| compiler_literal_from_str(repr).map(Literal::Compiler) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>literal = fallback::Literal::from_str(repr)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Literal::Fallback(literal)) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>compiler_literal_from_str(repr: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><proc_macro::Literal, LexError> { |
| <span class="attribute">#[cfg(not(no_literal_from_str))] |
| </span>{ |
| proc_macro::Literal::from_str(repr).map_err(LexError::Compiler) |
| } |
| <span class="attribute">#[cfg(no_literal_from_str)] |
| </span>{ |
| <span class="kw">let </span>tokens = proc_macro_parse(repr)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = tokens.into_iter(); |
| <span class="kw">if let </span>(<span class="prelude-val">Some</span>(proc_macro::TokenTree::Literal(literal)), <span class="prelude-val">None</span>) = (iter.next(), iter.next()) { |
| <span class="kw">if </span>literal.to_string().len() == repr.len() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(literal); |
| } |
| } |
| <span class="prelude-val">Err</span>(LexError::call_site()) |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Literal { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal::Compiler(t) => Display::fmt(t, f), |
| Literal::Fallback(t) => Display::fmt(t, f), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Literal { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal::Compiler(t) => Debug::fmt(t, f), |
| Literal::Fallback(t) => Debug::fmt(t, f), |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="proc_macro2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
