| <!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/parse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parse.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="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| <span id="526">526</span> |
| <span id="527">527</span> |
| <span id="528">528</span> |
| <span id="529">529</span> |
| <span id="530">530</span> |
| <span id="531">531</span> |
| <span id="532">532</span> |
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| <span id="610">610</span> |
| <span id="611">611</span> |
| <span id="612">612</span> |
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| <span id="820">820</span> |
| <span id="821">821</span> |
| <span id="822">822</span> |
| <span id="823">823</span> |
| <span id="824">824</span> |
| <span id="825">825</span> |
| <span id="826">826</span> |
| <span id="827">827</span> |
| <span id="828">828</span> |
| <span id="829">829</span> |
| <span id="830">830</span> |
| <span id="831">831</span> |
| <span id="832">832</span> |
| <span id="833">833</span> |
| <span id="834">834</span> |
| <span id="835">835</span> |
| <span id="836">836</span> |
| <span id="837">837</span> |
| <span id="838">838</span> |
| <span id="839">839</span> |
| <span id="840">840</span> |
| <span id="841">841</span> |
| <span id="842">842</span> |
| <span id="843">843</span> |
| <span id="844">844</span> |
| <span id="845">845</span> |
| <span id="846">846</span> |
| <span id="847">847</span> |
| <span id="848">848</span> |
| <span id="849">849</span> |
| <span id="850">850</span> |
| <span id="851">851</span> |
| <span id="852">852</span> |
| <span id="853">853</span> |
| <span id="854">854</span> |
| <span id="855">855</span> |
| <span id="856">856</span> |
| <span id="857">857</span> |
| <span id="858">858</span> |
| <span id="859">859</span> |
| <span id="860">860</span> |
| <span id="861">861</span> |
| <span id="862">862</span> |
| <span id="863">863</span> |
| <span id="864">864</span> |
| <span id="865">865</span> |
| <span id="866">866</span> |
| <span id="867">867</span> |
| <span id="868">868</span> |
| <span id="869">869</span> |
| <span id="870">870</span> |
| <span id="871">871</span> |
| <span id="872">872</span> |
| <span id="873">873</span> |
| <span id="874">874</span> |
| <span id="875">875</span> |
| <span id="876">876</span> |
| <span id="877">877</span> |
| <span id="878">878</span> |
| <span id="879">879</span> |
| <span id="880">880</span> |
| <span id="881">881</span> |
| <span id="882">882</span> |
| <span id="883">883</span> |
| <span id="884">884</span> |
| <span id="885">885</span> |
| <span id="886">886</span> |
| <span id="887">887</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::fallback::{ |
| is_ident_continue, is_ident_start, Group, LexError, Literal, Span, TokenStream, |
| TokenStreamBuilder, |
| }; |
| <span class="kw">use crate</span>::{Delimiter, Punct, Spacing, TokenTree}; |
| <span class="kw">use </span>core::char; |
| <span class="kw">use </span>core::str::{Bytes, CharIndices, Chars}; |
| |
| <span class="attribute">#[derive(Copy, Clone, Eq, PartialEq)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Cursor<<span class="lifetime">'a</span>> { |
| <span class="kw">pub </span>rest: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">pub </span>off: u32, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Cursor<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>advance(<span class="kw-2">&</span><span class="self">self</span>, bytes: usize) -> Cursor<<span class="lifetime">'a</span>> { |
| <span class="kw">let </span>(_front, rest) = <span class="self">self</span>.rest.split_at(bytes); |
| Cursor { |
| rest, |
| <span class="attribute">#[cfg(span_locations)] |
| </span>off: <span class="self">self</span>.off + _front.chars().count() <span class="kw">as </span>u32, |
| } |
| } |
| |
| <span class="kw">pub fn </span>starts_with(<span class="kw-2">&</span><span class="self">self</span>, s: <span class="kw-2">&</span>str) -> bool { |
| <span class="self">self</span>.rest.starts_with(s) |
| } |
| |
| <span class="kw">pub fn </span>starts_with_char(<span class="kw-2">&</span><span class="self">self</span>, ch: char) -> bool { |
| <span class="self">self</span>.rest.starts_with(ch) |
| } |
| |
| <span class="kw">pub fn </span>starts_with_fn<Pattern>(<span class="kw-2">&</span><span class="self">self</span>, f: Pattern) -> bool |
| <span class="kw">where |
| </span>Pattern: FnMut(char) -> bool, |
| { |
| <span class="self">self</span>.rest.starts_with(f) |
| } |
| |
| <span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.rest.is_empty() |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.rest.len() |
| } |
| |
| <span class="kw">fn </span>as_bytes(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'a </span>[u8] { |
| <span class="self">self</span>.rest.as_bytes() |
| } |
| |
| <span class="kw">fn </span>bytes(<span class="kw-2">&</span><span class="self">self</span>) -> Bytes<<span class="lifetime">'a</span>> { |
| <span class="self">self</span>.rest.bytes() |
| } |
| |
| <span class="kw">fn </span>chars(<span class="kw-2">&</span><span class="self">self</span>) -> Chars<<span class="lifetime">'a</span>> { |
| <span class="self">self</span>.rest.chars() |
| } |
| |
| <span class="kw">fn </span>char_indices(<span class="kw-2">&</span><span class="self">self</span>) -> CharIndices<<span class="lifetime">'a</span>> { |
| <span class="self">self</span>.rest.char_indices() |
| } |
| |
| <span class="kw">fn </span>parse(<span class="kw-2">&</span><span class="self">self</span>, tag: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><Cursor<<span class="lifetime">'a</span>>, Reject> { |
| <span class="kw">if </span><span class="self">self</span>.starts_with(tag) { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.advance(tag.len())) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Reject; |
| <span class="kw">type </span>PResult<<span class="lifetime">'a</span>, O> = <span class="prelude-ty">Result</span><(Cursor<<span class="lifetime">'a</span>>, O), Reject>; |
| |
| <span class="kw">fn </span>skip_whitespace(input: Cursor) -> Cursor { |
| <span class="kw">let </span><span class="kw-2">mut </span>s = input; |
| |
| <span class="kw">while </span>!s.is_empty() { |
| <span class="kw">let </span>byte = s.as_bytes()[<span class="number">0</span>]; |
| <span class="kw">if </span>byte == <span class="string">b'/' </span>{ |
| <span class="kw">if </span>s.starts_with(<span class="string">"//"</span>) |
| && (!s.starts_with(<span class="string">"///"</span>) || s.starts_with(<span class="string">"////"</span>)) |
| && !s.starts_with(<span class="string">"//!"</span>) |
| { |
| <span class="kw">let </span>(cursor, <span class="kw">_</span>) = take_until_newline_or_eof(s); |
| s = cursor; |
| <span class="kw">continue</span>; |
| } <span class="kw">else if </span>s.starts_with(<span class="string">"/**/"</span>) { |
| s = s.advance(<span class="number">4</span>); |
| <span class="kw">continue</span>; |
| } <span class="kw">else if </span>s.starts_with(<span class="string">"/*"</span>) |
| && (!s.starts_with(<span class="string">"/**"</span>) || s.starts_with(<span class="string">"/***"</span>)) |
| && !s.starts_with(<span class="string">"/*!"</span>) |
| { |
| <span class="kw">match </span>block_comment(s) { |
| <span class="prelude-val">Ok</span>((rest, <span class="kw">_</span>)) => { |
| s = rest; |
| <span class="kw">continue</span>; |
| } |
| <span class="prelude-val">Err</span>(Reject) => <span class="kw">return </span>s, |
| } |
| } |
| } |
| <span class="kw">match </span>byte { |
| <span class="string">b' ' </span>| <span class="number">0x09</span>..=<span class="number">0x0d </span>=> { |
| s = s.advance(<span class="number">1</span>); |
| <span class="kw">continue</span>; |
| } |
| b <span class="kw">if </span>b <= <span class="number">0x7f </span>=> {} |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>ch = s.chars().next().unwrap(); |
| <span class="kw">if </span>is_whitespace(ch) { |
| s = s.advance(ch.len_utf8()); |
| <span class="kw">continue</span>; |
| } |
| } |
| } |
| <span class="kw">return </span>s; |
| } |
| s |
| } |
| |
| <span class="kw">fn </span>block_comment(input: Cursor) -> PResult<<span class="kw-2">&</span>str> { |
| <span class="kw">if </span>!input.starts_with(<span class="string">"/*"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>depth = <span class="number">0usize</span>; |
| <span class="kw">let </span>bytes = input.as_bytes(); |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0usize</span>; |
| <span class="kw">let </span>upper = bytes.len() - <span class="number">1</span>; |
| |
| <span class="kw">while </span>i < upper { |
| <span class="kw">if </span>bytes[i] == <span class="string">b'/' </span>&& bytes[i + <span class="number">1</span>] == <span class="string">b'*' </span>{ |
| depth += <span class="number">1</span>; |
| i += <span class="number">1</span>; <span class="comment">// eat '*' |
| </span>} <span class="kw">else if </span>bytes[i] == <span class="string">b'*' </span>&& bytes[i + <span class="number">1</span>] == <span class="string">b'/' </span>{ |
| depth -= <span class="number">1</span>; |
| <span class="kw">if </span>depth == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((input.advance(i + <span class="number">2</span>), <span class="kw-2">&</span>input.rest[..i + <span class="number">2</span>])); |
| } |
| i += <span class="number">1</span>; <span class="comment">// eat '/' |
| </span>} |
| i += <span class="number">1</span>; |
| } |
| |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| |
| <span class="kw">fn </span>is_whitespace(ch: char) -> bool { |
| <span class="comment">// Rust treats left-to-right mark and right-to-left mark as whitespace |
| </span>ch.is_whitespace() || ch == <span class="string">'\u{200e}' </span>|| ch == <span class="string">'\u{200f}' |
| </span>} |
| |
| <span class="kw">fn </span>word_break(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">match </span>input.chars().next() { |
| <span class="prelude-val">Some</span>(ch) <span class="kw">if </span>is_ident_continue(ch) => <span class="prelude-val">Err</span>(Reject), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) | <span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(input), |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>token_stream(<span class="kw-2">mut </span>input: Cursor) -> <span class="prelude-ty">Result</span><TokenStream, LexError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>trees = TokenStreamBuilder::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = Vec::new(); |
| |
| <span class="kw">loop </span>{ |
| input = skip_whitespace(input); |
| |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>((rest, ())) = doc_comment(input, <span class="kw-2">&mut </span>trees) { |
| input = rest; |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">let </span>lo = input.off; |
| |
| <span class="kw">let </span>first = <span class="kw">match </span>input.bytes().next() { |
| <span class="prelude-val">Some</span>(first) => first, |
| <span class="prelude-val">None </span>=> <span class="kw">match </span>stack.last() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(trees.build()), |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="prelude-val">Some</span>((lo, _frame)) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(LexError { |
| span: Span { lo: <span class="kw-2">*</span>lo, hi: <span class="kw-2">*</span>lo }, |
| }) |
| } |
| <span class="attribute">#[cfg(not(span_locations))] |
| </span><span class="prelude-val">Some</span>(_frame) => <span class="kw">return </span><span class="prelude-val">Err</span>(LexError { span: Span {} }), |
| }, |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(open_delimiter) = <span class="kw">match </span>first { |
| <span class="string">b'(' </span>=> <span class="prelude-val">Some</span>(Delimiter::Parenthesis), |
| <span class="string">b'[' </span>=> <span class="prelude-val">Some</span>(Delimiter::Bracket), |
| <span class="string">b'{' </span>=> <span class="prelude-val">Some</span>(Delimiter::Brace), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } { |
| input = input.advance(<span class="number">1</span>); |
| <span class="kw">let </span>frame = (open_delimiter, trees); |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">let </span>frame = (lo, frame); |
| stack.push(frame); |
| trees = TokenStreamBuilder::new(); |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(close_delimiter) = <span class="kw">match </span>first { |
| <span class="string">b')' </span>=> <span class="prelude-val">Some</span>(Delimiter::Parenthesis), |
| <span class="string">b']' </span>=> <span class="prelude-val">Some</span>(Delimiter::Bracket), |
| <span class="string">b'}' </span>=> <span class="prelude-val">Some</span>(Delimiter::Brace), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } { |
| <span class="kw">let </span>frame = <span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">Some</span>(frame) => frame, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(lex_error(input)), |
| }; |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">let </span>(lo, frame) = frame; |
| <span class="kw">let </span>(open_delimiter, outer) = frame; |
| <span class="kw">if </span>open_delimiter != close_delimiter { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(lex_error(input)); |
| } |
| input = input.advance(<span class="number">1</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>g = Group::new(open_delimiter, trees.build()); |
| g.set_span(Span { |
| <span class="attribute">#[cfg(span_locations)] |
| </span>lo, |
| <span class="attribute">#[cfg(span_locations)] |
| </span>hi: input.off, |
| }); |
| trees = outer; |
| trees.push_token_from_parser(TokenTree::Group(<span class="kw">crate</span>::Group::_new_fallback(g))); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(rest, <span class="kw-2">mut </span>tt) = <span class="kw">match </span>leaf_token(input) { |
| <span class="prelude-val">Ok</span>((rest, tt)) => (rest, tt), |
| <span class="prelude-val">Err</span>(Reject) => <span class="kw">return </span><span class="prelude-val">Err</span>(lex_error(input)), |
| }; |
| tt.set_span(<span class="kw">crate</span>::Span::_new_fallback(Span { |
| <span class="attribute">#[cfg(span_locations)] |
| </span>lo, |
| <span class="attribute">#[cfg(span_locations)] |
| </span>hi: rest.off, |
| })); |
| trees.push_token_from_parser(tt); |
| input = rest; |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>lex_error(cursor: Cursor) -> LexError { |
| <span class="attribute">#[cfg(not(span_locations))] |
| </span><span class="kw">let _ </span>= cursor; |
| LexError { |
| span: Span { |
| <span class="attribute">#[cfg(span_locations)] |
| </span>lo: cursor.off, |
| <span class="attribute">#[cfg(span_locations)] |
| </span>hi: cursor.off, |
| }, |
| } |
| } |
| |
| <span class="kw">fn </span>leaf_token(input: Cursor) -> PResult<TokenTree> { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>((input, l)) = literal(input) { |
| <span class="comment">// must be parsed before ident |
| </span><span class="prelude-val">Ok</span>((input, TokenTree::Literal(<span class="kw">crate</span>::Literal::_new_fallback(l)))) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>((input, p)) = punct(input) { |
| <span class="prelude-val">Ok</span>((input, TokenTree::Punct(p))) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>((input, i)) = ident(input) { |
| <span class="prelude-val">Ok</span>((input, TokenTree::Ident(i))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>ident(input: Cursor) -> PResult<<span class="kw">crate</span>::Ident> { |
| <span class="kw">if </span>[<span class="string">"r\""</span>, <span class="string">"r#\""</span>, <span class="string">"r##"</span>, <span class="string">"b\""</span>, <span class="string">"b\'"</span>, <span class="string">"br\""</span>, <span class="string">"br#"</span>] |
| .iter() |
| .any(|prefix| input.starts_with(prefix)) |
| { |
| <span class="prelude-val">Err</span>(Reject) |
| } <span class="kw">else </span>{ |
| ident_any(input) |
| } |
| } |
| |
| <span class="kw">fn </span>ident_any(input: Cursor) -> PResult<<span class="kw">crate</span>::Ident> { |
| <span class="kw">let </span>raw = input.starts_with(<span class="string">"r#"</span>); |
| <span class="kw">let </span>rest = input.advance((raw <span class="kw">as </span>usize) << <span class="number">1</span>); |
| |
| <span class="kw">let </span>(rest, sym) = ident_not_raw(rest)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>!raw { |
| <span class="kw">let </span>ident = <span class="kw">crate</span>::Ident::new(sym, <span class="kw">crate</span>::Span::call_site()); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((rest, ident)); |
| } |
| |
| <span class="kw">match </span>sym { |
| <span class="string">"_" </span>| <span class="string">"super" </span>| <span class="string">"self" </span>| <span class="string">"Self" </span>| <span class="string">"crate" </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Reject), |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <span class="kw">let </span>ident = <span class="kw">crate</span>::Ident::_new_raw(sym, <span class="kw">crate</span>::Span::call_site()); |
| <span class="prelude-val">Ok</span>((rest, ident)) |
| } |
| |
| <span class="kw">fn </span>ident_not_raw(input: Cursor) -> PResult<<span class="kw-2">&</span>str> { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.char_indices(); |
| |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) <span class="kw">if </span>is_ident_start(ch) => {} |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Reject), |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>end = input.len(); |
| <span class="kw">for </span>(i, ch) <span class="kw">in </span>chars { |
| <span class="kw">if </span>!is_ident_continue(ch) { |
| end = i; |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>((input.advance(end), <span class="kw-2">&</span>input.rest[..end])) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>literal(input: Cursor) -> PResult<Literal> { |
| <span class="kw">let </span>rest = literal_nocapture(input)<span class="question-mark">?</span>; |
| <span class="kw">let </span>end = input.len() - rest.len(); |
| <span class="prelude-val">Ok</span>((rest, Literal::_new(input.rest[..end].to_string()))) |
| } |
| |
| <span class="kw">fn </span>literal_nocapture(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(ok) = string(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(ok) = byte_string(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(ok) = byte(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(ok) = character(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(ok) = float(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(ok) = int(input) { |
| <span class="prelude-val">Ok</span>(ok) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>literal_suffix(input: Cursor) -> Cursor { |
| <span class="kw">match </span>ident_not_raw(input) { |
| <span class="prelude-val">Ok</span>((input, <span class="kw">_</span>)) => input, |
| <span class="prelude-val">Err</span>(Reject) => input, |
| } |
| } |
| |
| <span class="kw">fn </span>string(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(input) = input.parse(<span class="string">"\""</span>) { |
| cooked_string(input) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(input) = input.parse(<span class="string">"r"</span>) { |
| raw_string(input) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>cooked_string(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.char_indices().peekable(); |
| |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((i, ch)) = chars.next() { |
| <span class="kw">match </span>ch { |
| <span class="string">'"' </span>=> { |
| <span class="kw">let </span>input = input.advance(i + <span class="number">1</span>); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(literal_suffix(input)); |
| } |
| <span class="string">'\r' </span>=> <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'\n'</span>)) => {} |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }, |
| <span class="string">'\\' </span>=> <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'x'</span>)) => { |
| <span class="kw">if </span>!backslash_x_char(<span class="kw-2">&mut </span>chars) { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'n'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'r'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'t'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'\\'</span>)) |
| | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'\''</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'"'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'0'</span>)) => {} |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'u'</span>)) => { |
| <span class="kw">if </span>!backslash_u(<span class="kw-2">&mut </span>chars) { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch @ <span class="string">'\n'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch @ <span class="string">'\r'</span>)) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>last = ch; |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>last == <span class="string">'\r' </span>&& chars.next().map_or(<span class="bool-val">true</span>, |(<span class="kw">_</span>, ch)| ch != <span class="string">'\n'</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">match </span>chars.peek() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) <span class="kw">if </span>ch.is_whitespace() => { |
| last = <span class="kw-2">*</span>ch; |
| chars.next(); |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| } |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }, |
| _ch => {} |
| } |
| } |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| |
| <span class="kw">fn </span>byte_string(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(input) = input.parse(<span class="string">"b\""</span>) { |
| cooked_byte_string(input) |
| } <span class="kw">else if let </span><span class="prelude-val">Ok</span>(input) = input.parse(<span class="string">"br"</span>) { |
| raw_string(input) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>cooked_byte_string(<span class="kw-2">mut </span>input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = input.bytes().enumerate(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((offset, b)) = bytes.next() { |
| <span class="kw">match </span>b { |
| <span class="string">b'"' </span>=> { |
| <span class="kw">let </span>input = input.advance(offset + <span class="number">1</span>); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(literal_suffix(input)); |
| } |
| <span class="string">b'\r' </span>=> <span class="kw">match </span>bytes.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'\n'</span>)) => {} |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }, |
| <span class="string">b'\\' </span>=> <span class="kw">match </span>bytes.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'x'</span>)) => { |
| <span class="kw">if </span>!backslash_x_byte(<span class="kw-2">&mut </span>bytes) { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'n'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'r'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b't'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'\\'</span>)) |
| | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'0'</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'\''</span>)) | <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">b'"'</span>)) => {} |
| <span class="prelude-val">Some</span>((newline, b @ <span class="string">b'\n'</span>)) | <span class="prelude-val">Some</span>((newline, b @ <span class="string">b'\r'</span>)) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>last = b <span class="kw">as </span>char; |
| <span class="kw">let </span>rest = input.advance(newline + <span class="number">1</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = rest.char_indices(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>last == <span class="string">'\r' </span>&& chars.next().map_or(<span class="bool-val">true</span>, |(<span class="kw">_</span>, ch)| ch != <span class="string">'\n'</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) <span class="kw">if </span>ch.is_whitespace() => last = ch, |
| <span class="prelude-val">Some</span>((offset, <span class="kw">_</span>)) => { |
| input = rest.advance(offset); |
| bytes = input.bytes().enumerate(); |
| <span class="kw">break</span>; |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Reject), |
| } |
| } |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }, |
| b <span class="kw">if </span>b < <span class="number">0x80 </span>=> {} |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| } |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| |
| <span class="kw">fn </span>raw_string(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.char_indices(); |
| <span class="kw">let </span><span class="kw-2">mut </span>n = <span class="number">0</span>; |
| <span class="kw">for </span>(i, ch) <span class="kw">in </span><span class="kw-2">&mut </span>chars { |
| <span class="kw">match </span>ch { |
| <span class="string">'"' </span>=> { |
| n = i; |
| <span class="kw">break</span>; |
| } |
| <span class="string">'#' </span>=> {} |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Reject), |
| } |
| } |
| <span class="kw">if </span>n > <span class="number">255 </span>{ |
| <span class="comment">// https://github.com/rust-lang/rust/pull/95251 |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((i, ch)) = chars.next() { |
| <span class="kw">match </span>ch { |
| <span class="string">'"' </span><span class="kw">if </span>input.rest[i + <span class="number">1</span>..].starts_with(<span class="kw-2">&</span>input.rest[..n]) => { |
| <span class="kw">let </span>rest = input.advance(i + <span class="number">1 </span>+ n); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(literal_suffix(rest)); |
| } |
| <span class="string">'\r' </span>=> <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">'\n'</span>)) => {} |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }, |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| |
| <span class="kw">fn </span>byte(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span>input = input.parse(<span class="string">"b'"</span>)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = input.bytes().enumerate(); |
| <span class="kw">let </span>ok = <span class="kw">match </span>bytes.next().map(|(<span class="kw">_</span>, b)| b) { |
| <span class="prelude-val">Some</span>(<span class="string">b'\\'</span>) => <span class="kw">match </span>bytes.next().map(|(<span class="kw">_</span>, b)| b) { |
| <span class="prelude-val">Some</span>(<span class="string">b'x'</span>) => backslash_x_byte(<span class="kw-2">&mut </span>bytes), |
| <span class="prelude-val">Some</span>(<span class="string">b'n'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'r'</span>) | <span class="prelude-val">Some</span>(<span class="string">b't'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\\'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'0'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\''</span>) |
| | <span class="prelude-val">Some</span>(<span class="string">b'"'</span>) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| }, |
| b => b.is_some(), |
| }; |
| <span class="kw">if </span>!ok { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">let </span>(offset, <span class="kw">_</span>) = bytes.next().ok_or(Reject)<span class="question-mark">?</span>; |
| <span class="kw">if </span>!input.chars().as_str().is_char_boundary(offset) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">let </span>input = input.advance(offset).parse(<span class="string">"'"</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(literal_suffix(input)) |
| } |
| |
| <span class="kw">fn </span>character(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span>input = input.parse(<span class="string">"'"</span>)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.char_indices(); |
| <span class="kw">let </span>ok = <span class="kw">match </span>chars.next().map(|(<span class="kw">_</span>, ch)| ch) { |
| <span class="prelude-val">Some</span>(<span class="string">'\\'</span>) => <span class="kw">match </span>chars.next().map(|(<span class="kw">_</span>, ch)| ch) { |
| <span class="prelude-val">Some</span>(<span class="string">'x'</span>) => backslash_x_char(<span class="kw-2">&mut </span>chars), |
| <span class="prelude-val">Some</span>(<span class="string">'u'</span>) => backslash_u(<span class="kw-2">&mut </span>chars), |
| <span class="prelude-val">Some</span>(<span class="string">'n'</span>) | <span class="prelude-val">Some</span>(<span class="string">'r'</span>) | <span class="prelude-val">Some</span>(<span class="string">'t'</span>) | <span class="prelude-val">Some</span>(<span class="string">'\\'</span>) | <span class="prelude-val">Some</span>(<span class="string">'0'</span>) | <span class="prelude-val">Some</span>(<span class="string">'\''</span>) | <span class="prelude-val">Some</span>(<span class="string">'"'</span>) => { |
| <span class="bool-val">true |
| </span>} |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| }, |
| ch => ch.is_some(), |
| }; |
| <span class="kw">if </span>!ok { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">let </span>(idx, <span class="kw">_</span>) = chars.next().ok_or(Reject)<span class="question-mark">?</span>; |
| <span class="kw">let </span>input = input.advance(idx).parse(<span class="string">"'"</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(literal_suffix(input)) |
| } |
| |
| <span class="macro">macro_rules! </span>next_ch { |
| (<span class="macro-nonterminal">$chars</span>:ident @ <span class="macro-nonterminal">$pat</span>:pat $(| <span class="macro-nonterminal">$rest</span>:pat)<span class="kw-2">*</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$chars</span>.next() { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) => <span class="kw">match </span>ch { |
| <span class="macro-nonterminal">$pat </span>$(| <span class="macro-nonterminal">$rest</span>)* => ch, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| }, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| } |
| }; |
| } |
| |
| <span class="kw">fn </span>backslash_x_char<I>(chars: <span class="kw-2">&mut </span>I) -> bool |
| <span class="kw">where |
| </span>I: Iterator<Item = (usize, char)>, |
| { |
| <span class="macro">next_ch!</span>(chars @ <span class="string">'0'</span>..=<span class="string">'7'</span>); |
| <span class="macro">next_ch!</span>(chars @ <span class="string">'0'</span>..=<span class="string">'9' </span>| <span class="string">'a'</span>..=<span class="string">'f' </span>| <span class="string">'A'</span>..=<span class="string">'F'</span>); |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="kw">fn </span>backslash_x_byte<I>(chars: <span class="kw-2">&mut </span>I) -> bool |
| <span class="kw">where |
| </span>I: Iterator<Item = (usize, u8)>, |
| { |
| <span class="macro">next_ch!</span>(chars @ <span class="string">b'0'</span>..=<span class="string">b'9' </span>| <span class="string">b'a'</span>..=<span class="string">b'f' </span>| <span class="string">b'A'</span>..=<span class="string">b'F'</span>); |
| <span class="macro">next_ch!</span>(chars @ <span class="string">b'0'</span>..=<span class="string">b'9' </span>| <span class="string">b'a'</span>..=<span class="string">b'f' </span>| <span class="string">b'A'</span>..=<span class="string">b'F'</span>); |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="kw">fn </span>backslash_u<I>(chars: <span class="kw-2">&mut </span>I) -> bool |
| <span class="kw">where |
| </span>I: Iterator<Item = (usize, char)>, |
| { |
| <span class="macro">next_ch!</span>(chars @ <span class="string">'{'</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>value = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="number">0</span>; |
| <span class="kw">for </span>(<span class="kw">_</span>, ch) <span class="kw">in </span>chars { |
| <span class="kw">let </span>digit = <span class="kw">match </span>ch { |
| <span class="string">'0'</span>..=<span class="string">'9' </span>=> ch <span class="kw">as </span>u8 - <span class="string">b'0'</span>, |
| <span class="string">'a'</span>..=<span class="string">'f' </span>=> <span class="number">10 </span>+ ch <span class="kw">as </span>u8 - <span class="string">b'a'</span>, |
| <span class="string">'A'</span>..=<span class="string">'F' </span>=> <span class="number">10 </span>+ ch <span class="kw">as </span>u8 - <span class="string">b'A'</span>, |
| <span class="string">'_' </span><span class="kw">if </span>len > <span class="number">0 </span>=> <span class="kw">continue</span>, |
| <span class="string">'}' </span><span class="kw">if </span>len > <span class="number">0 </span>=> <span class="kw">return </span>char::from_u32(value).is_some(), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| }; |
| <span class="kw">if </span>len == <span class="number">6 </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| value <span class="kw-2">*</span>= <span class="number">0x10</span>; |
| value += u32::from(digit); |
| len += <span class="number">1</span>; |
| } |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="kw">fn </span>float(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>rest = float_digits(input)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ch) = rest.chars().next() { |
| <span class="kw">if </span>is_ident_start(ch) { |
| rest = ident_not_raw(rest)<span class="question-mark">?</span>.<span class="number">0</span>; |
| } |
| } |
| word_break(rest) |
| } |
| |
| <span class="kw">fn </span>float_digits(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.chars().peekable(); |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>(ch) <span class="kw">if </span>ch >= <span class="string">'0' </span>&& ch <= <span class="string">'9' </span>=> {} |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Reject), |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="number">1</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_dot = <span class="bool-val">false</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_exp = <span class="bool-val">false</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>ch) = chars.peek() { |
| <span class="kw">match </span>ch { |
| <span class="string">'0'</span>..=<span class="string">'9' </span>| <span class="string">'_' </span>=> { |
| chars.next(); |
| len += <span class="number">1</span>; |
| } |
| <span class="string">'.' </span>=> { |
| <span class="kw">if </span>has_dot { |
| <span class="kw">break</span>; |
| } |
| chars.next(); |
| <span class="kw">if </span>chars |
| .peek() |
| .map_or(<span class="bool-val">false</span>, |<span class="kw-2">&</span>ch| ch == <span class="string">'.' </span>|| is_ident_start(ch)) |
| { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| len += <span class="number">1</span>; |
| has_dot = <span class="bool-val">true</span>; |
| } |
| <span class="string">'e' </span>| <span class="string">'E' </span>=> { |
| chars.next(); |
| len += <span class="number">1</span>; |
| has_exp = <span class="bool-val">true</span>; |
| <span class="kw">break</span>; |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| } |
| |
| <span class="kw">if </span>!(has_dot || has_exp) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| |
| <span class="kw">if </span>has_exp { |
| <span class="kw">let </span>token_before_exp = <span class="kw">if </span>has_dot { |
| <span class="prelude-val">Ok</span>(input.advance(len - <span class="number">1</span>)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| }; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_sign = <span class="bool-val">false</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_exp_value = <span class="bool-val">false</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>ch) = chars.peek() { |
| <span class="kw">match </span>ch { |
| <span class="string">'+' </span>| <span class="string">'-' </span>=> { |
| <span class="kw">if </span>has_exp_value { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if </span>has_sign { |
| <span class="kw">return </span>token_before_exp; |
| } |
| chars.next(); |
| len += <span class="number">1</span>; |
| has_sign = <span class="bool-val">true</span>; |
| } |
| <span class="string">'0'</span>..=<span class="string">'9' </span>=> { |
| chars.next(); |
| len += <span class="number">1</span>; |
| has_exp_value = <span class="bool-val">true</span>; |
| } |
| <span class="string">'_' </span>=> { |
| chars.next(); |
| len += <span class="number">1</span>; |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| } |
| <span class="kw">if </span>!has_exp_value { |
| <span class="kw">return </span>token_before_exp; |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(input.advance(len)) |
| } |
| |
| <span class="kw">fn </span>int(input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span><span class="kw-2">mut </span>rest = digits(input)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ch) = rest.chars().next() { |
| <span class="kw">if </span>is_ident_start(ch) { |
| rest = ident_not_raw(rest)<span class="question-mark">?</span>.<span class="number">0</span>; |
| } |
| } |
| word_break(rest) |
| } |
| |
| <span class="kw">fn </span>digits(<span class="kw-2">mut </span>input: Cursor) -> <span class="prelude-ty">Result</span><Cursor, Reject> { |
| <span class="kw">let </span>base = <span class="kw">if </span>input.starts_with(<span class="string">"0x"</span>) { |
| input = input.advance(<span class="number">2</span>); |
| <span class="number">16 |
| </span>} <span class="kw">else if </span>input.starts_with(<span class="string">"0o"</span>) { |
| input = input.advance(<span class="number">2</span>); |
| <span class="number">8 |
| </span>} <span class="kw">else if </span>input.starts_with(<span class="string">"0b"</span>) { |
| input = input.advance(<span class="number">2</span>); |
| <span class="number">2 |
| </span>} <span class="kw">else </span>{ |
| <span class="number">10 |
| </span>}; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>empty = <span class="bool-val">true</span>; |
| <span class="kw">for </span>b <span class="kw">in </span>input.bytes() { |
| <span class="kw">match </span>b { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="kw">let </span>digit = (b - <span class="string">b'0'</span>) <span class="kw">as </span>u64; |
| <span class="kw">if </span>digit >= base { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| } |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> { |
| <span class="kw">let </span>digit = <span class="number">10 </span>+ (b - <span class="string">b'a'</span>) <span class="kw">as </span>u64; |
| <span class="kw">if </span>digit >= base { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> { |
| <span class="kw">let </span>digit = <span class="number">10 </span>+ (b - <span class="string">b'A'</span>) <span class="kw">as </span>u64; |
| <span class="kw">if </span>digit >= base { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="string">b'_' </span>=> { |
| <span class="kw">if </span>empty && base == <span class="number">10 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| len += <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }; |
| len += <span class="number">1</span>; |
| empty = <span class="bool-val">false</span>; |
| } |
| <span class="kw">if </span>empty { |
| <span class="prelude-val">Err</span>(Reject) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(input.advance(len)) |
| } |
| } |
| |
| <span class="kw">fn </span>punct(input: Cursor) -> PResult<Punct> { |
| <span class="kw">let </span>(rest, ch) = punct_char(input)<span class="question-mark">?</span>; |
| <span class="kw">if </span>ch == <span class="string">'\'' </span>{ |
| <span class="kw">if </span>ident_any(rest)<span class="question-mark">?</span>.<span class="number">0</span>.starts_with_char(<span class="string">'\''</span>) { |
| <span class="prelude-val">Err</span>(Reject) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>((rest, Punct::new(<span class="string">'\''</span>, Spacing::Joint))) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>kind = <span class="kw">match </span>punct_char(rest) { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) => Spacing::Joint, |
| <span class="prelude-val">Err</span>(Reject) => Spacing::Alone, |
| }; |
| <span class="prelude-val">Ok</span>((rest, Punct::new(ch, kind))) |
| } |
| } |
| |
| <span class="kw">fn </span>punct_char(input: Cursor) -> PResult<char> { |
| <span class="kw">if </span>input.starts_with(<span class="string">"//"</span>) || input.starts_with(<span class="string">"/*"</span>) { |
| <span class="comment">// Do not accept `/` of a comment as a punct. |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = input.chars(); |
| <span class="kw">let </span>first = <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>(ch) => ch, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| }; |
| <span class="kw">let </span>recognized = <span class="string">"~!@#$%^&*-=+|;:,<.>/?'"</span>; |
| <span class="kw">if </span>recognized.contains(first) { |
| <span class="prelude-val">Ok</span>((input.advance(first.len_utf8()), first)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>doc_comment<<span class="lifetime">'a</span>>(input: Cursor<<span class="lifetime">'a</span>>, trees: <span class="kw-2">&mut </span>TokenStreamBuilder) -> PResult<<span class="lifetime">'a</span>, ()> { |
| <span class="attribute">#[cfg(span_locations)] |
| </span><span class="kw">let </span>lo = input.off; |
| <span class="kw">let </span>(rest, (comment, inner)) = doc_comment_contents(input)<span class="question-mark">?</span>; |
| <span class="kw">let </span>span = <span class="kw">crate</span>::Span::_new_fallback(Span { |
| <span class="attribute">#[cfg(span_locations)] |
| </span>lo, |
| <span class="attribute">#[cfg(span_locations)] |
| </span>hi: rest.off, |
| }); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>scan_for_bare_cr = comment; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(cr) = scan_for_bare_cr.find(<span class="string">'\r'</span>) { |
| <span class="kw">let </span>rest = <span class="kw-2">&</span>scan_for_bare_cr[cr + <span class="number">1</span>..]; |
| <span class="kw">if </span>!rest.starts_with(<span class="string">'\n'</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| scan_for_bare_cr = rest; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pound = Punct::new(<span class="string">'#'</span>, Spacing::Alone); |
| pound.set_span(span); |
| trees.push_token_from_parser(TokenTree::Punct(pound)); |
| |
| <span class="kw">if </span>inner { |
| <span class="kw">let </span><span class="kw-2">mut </span>bang = Punct::new(<span class="string">'!'</span>, Spacing::Alone); |
| bang.set_span(span); |
| trees.push_token_from_parser(TokenTree::Punct(bang)); |
| } |
| |
| <span class="kw">let </span>doc_ident = <span class="kw">crate</span>::Ident::new(<span class="string">"doc"</span>, span); |
| <span class="kw">let </span><span class="kw-2">mut </span>equal = Punct::new(<span class="string">'='</span>, Spacing::Alone); |
| equal.set_span(span); |
| <span class="kw">let </span><span class="kw-2">mut </span>literal = <span class="kw">crate</span>::Literal::string(comment); |
| literal.set_span(span); |
| <span class="kw">let </span><span class="kw-2">mut </span>bracketed = TokenStreamBuilder::with_capacity(<span class="number">3</span>); |
| bracketed.push_token_from_parser(TokenTree::Ident(doc_ident)); |
| bracketed.push_token_from_parser(TokenTree::Punct(equal)); |
| bracketed.push_token_from_parser(TokenTree::Literal(literal)); |
| <span class="kw">let </span>group = Group::new(Delimiter::Bracket, bracketed.build()); |
| <span class="kw">let </span><span class="kw-2">mut </span>group = <span class="kw">crate</span>::Group::_new_fallback(group); |
| group.set_span(span); |
| trees.push_token_from_parser(TokenTree::Group(group)); |
| |
| <span class="prelude-val">Ok</span>((rest, ())) |
| } |
| |
| <span class="kw">fn </span>doc_comment_contents(input: Cursor) -> PResult<(<span class="kw-2">&</span>str, bool)> { |
| <span class="kw">if </span>input.starts_with(<span class="string">"//!"</span>) { |
| <span class="kw">let </span>input = input.advance(<span class="number">3</span>); |
| <span class="kw">let </span>(input, s) = take_until_newline_or_eof(input); |
| <span class="prelude-val">Ok</span>((input, (s, <span class="bool-val">true</span>))) |
| } <span class="kw">else if </span>input.starts_with(<span class="string">"/*!"</span>) { |
| <span class="kw">let </span>(input, s) = block_comment(input)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((input, (<span class="kw-2">&</span>s[<span class="number">3</span>..s.len() - <span class="number">2</span>], <span class="bool-val">true</span>))) |
| } <span class="kw">else if </span>input.starts_with(<span class="string">"///"</span>) { |
| <span class="kw">let </span>input = input.advance(<span class="number">3</span>); |
| <span class="kw">if </span>input.starts_with_char(<span class="string">'/'</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reject); |
| } |
| <span class="kw">let </span>(input, s) = take_until_newline_or_eof(input); |
| <span class="prelude-val">Ok</span>((input, (s, <span class="bool-val">false</span>))) |
| } <span class="kw">else if </span>input.starts_with(<span class="string">"/**"</span>) && !input.rest[<span class="number">3</span>..].starts_with(<span class="string">'*'</span>) { |
| <span class="kw">let </span>(input, s) = block_comment(input)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((input, (<span class="kw-2">&</span>s[<span class="number">3</span>..s.len() - <span class="number">2</span>], <span class="bool-val">false</span>))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Reject) |
| } |
| } |
| |
| <span class="kw">fn </span>take_until_newline_or_eof(input: Cursor) -> (Cursor, <span class="kw-2">&</span>str) { |
| <span class="kw">let </span>chars = input.char_indices(); |
| |
| <span class="kw">for </span>(i, ch) <span class="kw">in </span>chars { |
| <span class="kw">if </span>ch == <span class="string">'\n' </span>{ |
| <span class="kw">return </span>(input.advance(i), <span class="kw-2">&</span>input.rest[..i]); |
| } <span class="kw">else if </span>ch == <span class="string">'\r' </span>&& input.rest[i + <span class="number">1</span>..].starts_with(<span class="string">'\n'</span>) { |
| <span class="kw">return </span>(input.advance(i + <span class="number">1</span>), <span class="kw-2">&</span>input.rest[..i]); |
| } |
| } |
| |
| (input.advance(input.len()), input.rest) |
| } |
| </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> |