| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-2.0.18/src/lit.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lit.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../syn/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="1589">1589</span> |
| <span id="1590">1590</span> |
| <span id="1591">1591</span> |
| <span id="1592">1592</span> |
| <span id="1593">1593</span> |
| <span id="1594">1594</span> |
| <span id="1595">1595</span> |
| <span id="1596">1596</span> |
| <span id="1597">1597</span> |
| <span id="1598">1598</span> |
| <span id="1599">1599</span> |
| <span id="1600">1600</span> |
| <span id="1601">1601</span> |
| <span id="1602">1602</span> |
| <span id="1603">1603</span> |
| <span id="1604">1604</span> |
| <span id="1605">1605</span> |
| <span id="1606">1606</span> |
| <span id="1607">1607</span> |
| <span id="1608">1608</span> |
| <span id="1609">1609</span> |
| <span id="1610">1610</span> |
| <span id="1611">1611</span> |
| <span id="1612">1612</span> |
| <span id="1613">1613</span> |
| <span id="1614">1614</span> |
| <span id="1615">1615</span> |
| <span id="1616">1616</span> |
| <span id="1617">1617</span> |
| <span id="1618">1618</span> |
| <span id="1619">1619</span> |
| <span id="1620">1620</span> |
| <span id="1621">1621</span> |
| <span id="1622">1622</span> |
| <span id="1623">1623</span> |
| <span id="1624">1624</span> |
| <span id="1625">1625</span> |
| <span id="1626">1626</span> |
| <span id="1627">1627</span> |
| <span id="1628">1628</span> |
| <span id="1629">1629</span> |
| <span id="1630">1630</span> |
| <span id="1631">1631</span> |
| <span id="1632">1632</span> |
| <span id="1633">1633</span> |
| <span id="1634">1634</span> |
| <span id="1635">1635</span> |
| <span id="1636">1636</span> |
| </pre><pre class="rust"><code><span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::lookahead; |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, Parser}; |
| <span class="kw">use crate</span>::{Error, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>proc_macro2::{Ident, Literal, Span}; |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span>proc_macro2::{TokenStream, TokenTree}; |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Display}; |
| <span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| </span><span class="kw">use </span>std::hash::{Hash, Hasher}; |
| <span class="kw">use </span>std::str::{<span class="self">self</span>, FromStr}; |
| |
| <span class="macro">ast_enum_of_structs! </span>{ |
| <span class="doccomment">/// A Rust literal such as a string or integer or boolean. |
| /// |
| /// # Syntax tree enum |
| /// |
| /// This type is a [syntax tree enum]. |
| /// |
| /// [syntax tree enum]: crate::Expr#syntax-tree-enums |
| </span><span class="attribute">#[non_exhaustive] |
| </span><span class="kw">pub enum </span>Lit { |
| <span class="doccomment">/// A UTF-8 string literal: `"foo"`. |
| </span>Str(LitStr), |
| |
| <span class="doccomment">/// A byte string literal: `b"foo"`. |
| </span>ByteStr(LitByteStr), |
| |
| <span class="doccomment">/// A byte literal: `b'f'`. |
| </span>Byte(LitByte), |
| |
| <span class="doccomment">/// A character literal: `'a'`. |
| </span>Char(LitChar), |
| |
| <span class="doccomment">/// An integer literal: `1` or `1u16`. |
| </span>Int(LitInt), |
| |
| <span class="doccomment">/// A floating point literal: `1f64` or `1.0e10f64`. |
| /// |
| /// Must be finite. May not be infinite or NaN. |
| </span>Float(LitFloat), |
| |
| <span class="doccomment">/// A boolean literal: `true` or `false`. |
| </span>Bool(LitBool), |
| |
| <span class="doccomment">/// A raw token literal not interpreted by Syn. |
| </span>Verbatim(Literal), |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A UTF-8 string literal: `"foo"`. |
| </span><span class="kw">pub struct </span>LitStr { |
| repr: Box<LitRepr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A byte string literal: `b"foo"`. |
| </span><span class="kw">pub struct </span>LitByteStr { |
| repr: Box<LitRepr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A byte literal: `b'f'`. |
| </span><span class="kw">pub struct </span>LitByte { |
| repr: Box<LitRepr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A character literal: `'a'`. |
| </span><span class="kw">pub struct </span>LitChar { |
| repr: Box<LitRepr>, |
| } |
| } |
| |
| <span class="kw">struct </span>LitRepr { |
| token: Literal, |
| suffix: Box<str>, |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An integer literal: `1` or `1u16`. |
| </span><span class="kw">pub struct </span>LitInt { |
| repr: Box<LitIntRepr>, |
| } |
| } |
| |
| <span class="kw">struct </span>LitIntRepr { |
| token: Literal, |
| digits: Box<str>, |
| suffix: Box<str>, |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A floating point literal: `1f64` or `1.0e10f64`. |
| /// |
| /// Must be finite. May not be infinite or NaN. |
| </span><span class="kw">pub struct </span>LitFloat { |
| repr: Box<LitFloatRepr>, |
| } |
| } |
| |
| <span class="kw">struct </span>LitFloatRepr { |
| token: Literal, |
| digits: Box<str>, |
| suffix: Box<str>, |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A boolean literal: `true` or `false`. |
| </span><span class="kw">pub struct </span>LitBool { |
| <span class="kw">pub </span>value: bool, |
| <span class="kw">pub </span>span: Span, |
| } |
| } |
| |
| <span class="kw">impl </span>LitStr { |
| <span class="kw">pub fn </span>new(value: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>token = Literal::string(value); |
| token.set_span(span); |
| LitStr { |
| repr: Box::new(LitRepr { |
| token, |
| suffix: Box::<str>::default(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> String { |
| <span class="kw">let </span>repr = <span class="self">self</span>.repr.token.to_string(); |
| <span class="kw">let </span>(value, _suffix) = value::parse_lit_str(<span class="kw-2">&</span>repr); |
| String::from(value) |
| } |
| |
| <span class="doccomment">/// Parse a syntax tree node from the content of this string literal. |
| /// |
| /// All spans in the syntax tree will point to the span of this `LitStr`. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use syn::{Attribute, Error, Expr, Lit, Meta, Path, Result}; |
| /// |
| /// // Parses the path from an attribute that looks like: |
| /// // |
| /// // #[path = "a::b::c"] |
| /// // |
| /// // or returns `None` if the input is some other attribute. |
| /// fn get_path(attr: &Attribute) -> Result<Option<Path>> { |
| /// if !attr.path().is_ident("path") { |
| /// return Ok(None); |
| /// } |
| /// |
| /// if let Meta::NameValue(meta) = &attr.meta { |
| /// if let Expr::Lit(expr) = &meta.value { |
| /// if let Lit::Str(lit_str) = &expr.lit { |
| /// return lit_str.parse().map(Some); |
| /// } |
| /// } |
| /// } |
| /// |
| /// let message = "expected #[path = \"...\"]"; |
| /// Err(Error::new_spanned(attr, message)) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">pub fn </span>parse<T: Parse>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><T> { |
| <span class="self">self</span>.parse_with(T::parse) |
| } |
| |
| <span class="doccomment">/// Invoke parser on the content of this string literal. |
| /// |
| /// All spans in the syntax tree will point to the span of this `LitStr`. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// # use proc_macro2::Span; |
| /// # use syn::{LitStr, Result}; |
| /// # |
| /// # fn main() -> Result<()> { |
| /// # let lit_str = LitStr::new("a::b::c", Span::call_site()); |
| /// # |
| /// # const IGNORE: &str = stringify! { |
| /// let lit_str: LitStr = /* ... */; |
| /// # }; |
| /// |
| /// // Parse a string literal like "a::b::c" into a Path, not allowing |
| /// // generic arguments on any of the path segments. |
| /// let basic_path = lit_str.parse_with(syn::Path::parse_mod_style)?; |
| /// # |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">pub fn </span>parse_with<F: Parser>(<span class="kw-2">&</span><span class="self">self</span>, parser: F) -> <span class="prelude-ty">Result</span><F::Output> { |
| <span class="kw">use </span>proc_macro2::Group; |
| |
| <span class="comment">// Token stream with every span replaced by the given one. |
| </span><span class="kw">fn </span>respan_token_stream(stream: TokenStream, span: Span) -> TokenStream { |
| stream |
| .into_iter() |
| .map(|token| respan_token_tree(token, span)) |
| .collect() |
| } |
| |
| <span class="comment">// Token tree with every span replaced by the given one. |
| </span><span class="kw">fn </span>respan_token_tree(<span class="kw-2">mut </span>token: TokenTree, span: Span) -> TokenTree { |
| <span class="kw">match </span><span class="kw-2">&mut </span>token { |
| TokenTree::Group(g) => { |
| <span class="kw">let </span>stream = respan_token_stream(g.stream(), span); |
| <span class="kw-2">*</span>g = Group::new(g.delimiter(), stream); |
| g.set_span(span); |
| } |
| other => other.set_span(span), |
| } |
| token |
| } |
| |
| <span class="comment">// Parse string literal into a token stream with every span equal to the |
| // original literal's span. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>tokens = TokenStream::from_str(<span class="kw-2">&</span><span class="self">self</span>.value())<span class="question-mark">?</span>; |
| tokens = respan_token_stream(tokens, <span class="self">self</span>.span()); |
| |
| parser.parse2(tokens) |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>LitByteStr { |
| <span class="kw">pub fn </span>new(value: <span class="kw-2">&</span>[u8], span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>token = Literal::byte_string(value); |
| token.set_span(span); |
| LitByteStr { |
| repr: Box::new(LitRepr { |
| token, |
| suffix: Box::<str>::default(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<u8> { |
| <span class="kw">let </span>repr = <span class="self">self</span>.repr.token.to_string(); |
| <span class="kw">let </span>(value, _suffix) = value::parse_lit_byte_str(<span class="kw-2">&</span>repr); |
| value |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>LitByte { |
| <span class="kw">pub fn </span>new(value: u8, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>token = Literal::u8_suffixed(value); |
| token.set_span(span); |
| LitByte { |
| repr: Box::new(LitRepr { |
| token, |
| suffix: Box::<str>::default(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="kw">let </span>repr = <span class="self">self</span>.repr.token.to_string(); |
| <span class="kw">let </span>(value, _suffix) = value::parse_lit_byte(<span class="kw-2">&</span>repr); |
| value |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>LitChar { |
| <span class="kw">pub fn </span>new(value: char, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>token = Literal::character(value); |
| token.set_span(span); |
| LitChar { |
| repr: Box::new(LitRepr { |
| token, |
| suffix: Box::<str>::default(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="kw">let </span>repr = <span class="self">self</span>.repr.token.to_string(); |
| <span class="kw">let </span>(value, _suffix) = value::parse_lit_char(<span class="kw-2">&</span>repr); |
| value |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>LitInt { |
| <span class="kw">pub fn </span>new(repr: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>(digits, suffix) = <span class="kw">match </span>value::parse_lit_int(repr) { |
| <span class="prelude-val">Some</span>(parse) => parse, |
| <span class="prelude-val">None </span>=> <span class="macro">panic!</span>(<span class="string">"Not an integer literal: `{}`"</span>, repr), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>token: Literal = repr.parse().unwrap(); |
| token.set_span(span); |
| LitInt { |
| repr: Box::new(LitIntRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>base10_digits(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.digits |
| } |
| |
| <span class="doccomment">/// Parses the literal into a selected number type. |
| /// |
| /// This is equivalent to `lit.base10_digits().parse()` except that the |
| /// resulting errors will be correctly spanned to point to the literal token |
| /// in the macro input. |
| /// |
| /// ``` |
| /// use syn::LitInt; |
| /// use syn::parse::{Parse, ParseStream, Result}; |
| /// |
| /// struct Port { |
| /// value: u16, |
| /// } |
| /// |
| /// impl Parse for Port { |
| /// fn parse(input: ParseStream) -> Result<Self> { |
| /// let lit: LitInt = input.parse()?; |
| /// let value = lit.base10_parse::<u16>()?; |
| /// Ok(Port { value }) |
| /// } |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>base10_parse<N>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><N> |
| <span class="kw">where |
| </span>N: FromStr, |
| N::Err: Display, |
| { |
| <span class="self">self</span>.base10_digits() |
| .parse() |
| .map_err(|err| Error::new(<span class="self">self</span>.span(), err)) |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>From<Literal> <span class="kw">for </span>LitInt { |
| <span class="kw">fn </span>from(token: Literal) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>repr = token.to_string(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((digits, suffix)) = value::parse_lit_int(<span class="kw-2">&</span>repr) { |
| LitInt { |
| repr: Box::new(LitIntRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"Not an integer literal: `{}`"</span>, repr); |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>LitInt { |
| <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="self">self</span>.repr.token.fmt(formatter) |
| } |
| } |
| |
| <span class="kw">impl </span>LitFloat { |
| <span class="kw">pub fn </span>new(repr: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>(digits, suffix) = <span class="kw">match </span>value::parse_lit_float(repr) { |
| <span class="prelude-val">Some</span>(parse) => parse, |
| <span class="prelude-val">None </span>=> <span class="macro">panic!</span>(<span class="string">"Not a float literal: `{}`"</span>, repr), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>token: Literal = repr.parse().unwrap(); |
| token.set_span(span); |
| LitFloat { |
| repr: Box::new(LitFloatRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>base10_digits(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.digits |
| } |
| |
| <span class="kw">pub fn </span>base10_parse<N>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><N> |
| <span class="kw">where |
| </span>N: FromStr, |
| N::Err: Display, |
| { |
| <span class="self">self</span>.base10_digits() |
| .parse() |
| .map_err(|err| Error::new(<span class="self">self</span>.span(), err)) |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.repr.suffix |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.repr.token.span() |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.repr.token.set_span(span); |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Literal { |
| <span class="self">self</span>.repr.token.clone() |
| } |
| } |
| |
| <span class="kw">impl </span>From<Literal> <span class="kw">for </span>LitFloat { |
| <span class="kw">fn </span>from(token: Literal) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>repr = token.to_string(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((digits, suffix)) = value::parse_lit_float(<span class="kw-2">&</span>repr) { |
| LitFloat { |
| repr: Box::new(LitFloatRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"Not a float literal: `{}`"</span>, repr); |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>LitFloat { |
| <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="self">self</span>.repr.token.fmt(formatter) |
| } |
| } |
| |
| <span class="kw">impl </span>LitBool { |
| <span class="kw">pub fn </span>new(value: bool, span: Span) -> <span class="self">Self </span>{ |
| LitBool { value, span } |
| } |
| |
| <span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.value |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.span |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.span = span; |
| } |
| |
| <span class="kw">pub fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> Ident { |
| <span class="kw">let </span>s = <span class="kw">if </span><span class="self">self</span>.value { <span class="string">"true" </span>} <span class="kw">else </span>{ <span class="string">"false" </span>}; |
| Ident::new(s, <span class="self">self</span>.span) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| </span><span class="kw">mod </span>debug_impls { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Debug}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitStr { |
| <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">impl </span>LitStr { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitStr"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitByteStr { |
| <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">impl </span>LitByteStr { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitByteStr"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitByte { |
| <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">impl </span>LitByte { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitByte"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitChar { |
| <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">impl </span>LitChar { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitChar"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitInt { |
| <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">impl </span>LitInt { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitInt"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitFloat { |
| <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">impl </span>LitFloat { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.repr.token)) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitFloat"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Debug <span class="kw">for </span>LitBool { |
| <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">impl </span>LitBool { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| formatter: <span class="kw-2">&mut </span>fmt::Formatter, |
| name: <span class="kw-2">&</span>str, |
| ) -> fmt::Result { |
| formatter |
| .debug_struct(name) |
| .field(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="self">self</span>.value) |
| .finish() |
| } |
| } |
| <span class="self">self</span>.debug(formatter, <span class="string">"LitBool"</span>) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"clone-impls"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"clone-impls"</span>)))] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span>LitRepr { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| LitRepr { |
| token: <span class="self">self</span>.token.clone(), |
| suffix: <span class="self">self</span>.suffix.clone(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"clone-impls"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"clone-impls"</span>)))] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span>LitIntRepr { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| LitIntRepr { |
| token: <span class="self">self</span>.token.clone(), |
| digits: <span class="self">self</span>.digits.clone(), |
| suffix: <span class="self">self</span>.suffix.clone(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"clone-impls"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"clone-impls"</span>)))] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span>LitFloatRepr { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| LitFloatRepr { |
| token: <span class="self">self</span>.token.clone(), |
| digits: <span class="self">self</span>.digits.clone(), |
| suffix: <span class="self">self</span>.suffix.clone(), |
| } |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>lit_extra_traits { |
| (<span class="macro-nonterminal">$ty</span>:ident) => { |
| <span class="attribute">#[cfg(feature = <span class="string">"clone-impls"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"clone-impls"</span>)))] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="macro-nonterminal">$ty </span>{ |
| repr: <span class="self">self</span>.repr.clone(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>PartialEq <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.repr.token.to_string() == other.repr.token.to_string() |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"extra-traits"</span>)))] |
| </span><span class="kw">impl </span>Hash <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">fn </span>hash<H>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) |
| <span class="kw">where |
| </span>H: Hasher, |
| { |
| <span class="self">self</span>.repr.token.to_string().hash(state); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[doc(hidden)] |
| #[allow(non_snake_case)] |
| </span><span class="kw">pub fn </span><span class="macro-nonterminal">$ty</span>(marker: lookahead::TokenMarker) -> <span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">match </span>marker {} |
| } |
| }; |
| } |
| |
| <span class="macro">lit_extra_traits!</span>(LitStr); |
| <span class="macro">lit_extra_traits!</span>(LitByteStr); |
| <span class="macro">lit_extra_traits!</span>(LitByte); |
| <span class="macro">lit_extra_traits!</span>(LitChar); |
| <span class="macro">lit_extra_traits!</span>(LitInt); |
| <span class="macro">lit_extra_traits!</span>(LitFloat); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[doc(hidden)] |
| #[allow(non_snake_case)] |
| </span><span class="kw">pub fn </span>LitBool(marker: lookahead::TokenMarker) -> LitBool { |
| <span class="kw">match </span>marker {} |
| } |
| |
| <span class="macro">ast_enum! </span>{ |
| <span class="doccomment">/// The style of a string literal, either plain quoted or a raw string like |
| /// `r##"data"##`. |
| </span><span class="kw">pub enum </span>StrStyle #no_visit { |
| <span class="doccomment">/// An ordinary string like `"data"`. |
| </span>Cooked, |
| <span class="doccomment">/// A raw string like `r##"data"##`. |
| /// |
| /// The unsigned integer is the number of `#` symbols used. |
| </span>Raw(usize), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[doc(hidden)] |
| #[allow(non_snake_case)] |
| </span><span class="kw">pub fn </span>Lit(marker: lookahead::TokenMarker) -> Lit { |
| <span class="kw">match </span>marker {} |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>parsing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::buffer::Cursor; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>proc_macro2::Punct; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Lit { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| input.step(|cursor| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((lit, rest)) = cursor.literal() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((Lit::new(lit), rest)); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((ident, rest)) = cursor.ident() { |
| <span class="kw">let </span>value = ident == <span class="string">"true"</span>; |
| <span class="kw">if </span>value || ident == <span class="string">"false" </span>{ |
| <span class="kw">let </span>lit_bool = LitBool { |
| value, |
| span: ident.span(), |
| }; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((Lit::Bool(lit_bool), rest)); |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((punct, rest)) = cursor.punct() { |
| <span class="kw">if </span>punct.as_char() == <span class="string">'-' </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((lit, rest)) = parse_negative_lit(punct, rest) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((lit, rest)); |
| } |
| } |
| } |
| |
| <span class="prelude-val">Err</span>(cursor.error(<span class="string">"expected literal"</span>)) |
| }) |
| } |
| } |
| |
| <span class="kw">fn </span>parse_negative_lit(neg: Punct, cursor: Cursor) -> <span class="prelude-ty">Option</span><(Lit, Cursor)> { |
| <span class="kw">let </span>(lit, rest) = cursor.literal()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>span = neg.span(); |
| span = span.join(lit.span()).unwrap_or(span); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>repr = lit.to_string(); |
| repr.insert(<span class="number">0</span>, <span class="string">'-'</span>); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((digits, suffix)) = value::parse_lit_int(<span class="kw-2">&</span>repr) { |
| <span class="kw">let </span><span class="kw-2">mut </span>token: Literal = repr.parse().unwrap(); |
| token.set_span(span); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(( |
| Lit::Int(LitInt { |
| repr: Box::new(LitIntRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| }), |
| rest, |
| )); |
| } |
| |
| <span class="kw">let </span>(digits, suffix) = value::parse_lit_float(<span class="kw-2">&</span>repr)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>token: Literal = repr.parse().unwrap(); |
| token.set_span(span); |
| <span class="prelude-val">Some</span>(( |
| Lit::Float(LitFloat { |
| repr: Box::new(LitFloatRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| }), |
| rest, |
| )) |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitStr { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Str(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected string literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitByteStr { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::ByteStr(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected byte string literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitByte { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Byte(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected byte literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitChar { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Char(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected character literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitInt { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Int(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected integer literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitFloat { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Float(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected floating point literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>LitBool { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>head = input.fork(); |
| <span class="kw">match </span>input.parse() { |
| <span class="prelude-val">Ok</span>(Lit::Bool(lit)) => <span class="prelude-val">Ok</span>(lit), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(head.error(<span class="string">"expected boolean literal"</span>)), |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">mod </span>printing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>proc_macro2::TokenStream; |
| <span class="kw">use </span>quote::{ToTokens, TokenStreamExt}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitStr { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitByteStr { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitByte { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitChar { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitInt { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitFloat { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.repr.token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>LitBool { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append(<span class="self">self</span>.token()); |
| } |
| } |
| } |
| |
| <span class="kw">mod </span>value { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::bigint::BigInt; |
| <span class="kw">use </span>std::char; |
| <span class="kw">use </span>std::ops::{Index, RangeFrom}; |
| |
| <span class="kw">impl </span>Lit { |
| <span class="doccomment">/// Interpret a Syn literal from a proc-macro2 literal. |
| </span><span class="kw">pub fn </span>new(token: Literal) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>repr = token.to_string(); |
| |
| <span class="kw">match </span>byte(<span class="kw-2">&</span>repr, <span class="number">0</span>) { |
| <span class="comment">// "...", r"...", r#"..."# |
| </span><span class="string">b'"' </span>| <span class="string">b'r' </span>=> { |
| <span class="kw">let </span>(<span class="kw">_</span>, suffix) = parse_lit_str(<span class="kw-2">&</span>repr); |
| <span class="kw">return </span>Lit::Str(LitStr { |
| repr: Box::new(LitRepr { token, suffix }), |
| }); |
| } |
| <span class="string">b'b' </span>=> <span class="kw">match </span>byte(<span class="kw-2">&</span>repr, <span class="number">1</span>) { |
| <span class="comment">// b"...", br"...", br#"...#" |
| </span><span class="string">b'"' </span>| <span class="string">b'r' </span>=> { |
| <span class="kw">let </span>(<span class="kw">_</span>, suffix) = parse_lit_byte_str(<span class="kw-2">&</span>repr); |
| <span class="kw">return </span>Lit::ByteStr(LitByteStr { |
| repr: Box::new(LitRepr { token, suffix }), |
| }); |
| } |
| <span class="comment">// b'...' |
| </span><span class="string">b'\'' </span>=> { |
| <span class="kw">let </span>(<span class="kw">_</span>, suffix) = parse_lit_byte(<span class="kw-2">&</span>repr); |
| <span class="kw">return </span>Lit::Byte(LitByte { |
| repr: Box::new(LitRepr { token, suffix }), |
| }); |
| } |
| <span class="kw">_ </span>=> {} |
| }, |
| <span class="comment">// '...' |
| </span><span class="string">b'\'' </span>=> { |
| <span class="kw">let </span>(<span class="kw">_</span>, suffix) = parse_lit_char(<span class="kw-2">&</span>repr); |
| <span class="kw">return </span>Lit::Char(LitChar { |
| repr: Box::new(LitRepr { token, suffix }), |
| }); |
| } |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>| <span class="string">b'-' </span>=> { |
| <span class="comment">// 0, 123, 0xFF, 0o77, 0b11 |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>((digits, suffix)) = parse_lit_int(<span class="kw-2">&</span>repr) { |
| <span class="kw">return </span>Lit::Int(LitInt { |
| repr: Box::new(LitIntRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| }); |
| } |
| <span class="comment">// 1.0, 1e-1, 1e+1 |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>((digits, suffix)) = parse_lit_float(<span class="kw-2">&</span>repr) { |
| <span class="kw">return </span>Lit::Float(LitFloat { |
| repr: Box::new(LitFloatRepr { |
| token, |
| digits, |
| suffix, |
| }), |
| }); |
| } |
| } |
| <span class="comment">// true, false |
| </span><span class="string">b't' </span>| <span class="string">b'f' </span>=> { |
| <span class="kw">if </span>repr == <span class="string">"true" </span>|| repr == <span class="string">"false" </span>{ |
| <span class="kw">return </span>Lit::Bool(LitBool { |
| value: repr == <span class="string">"true"</span>, |
| span: token.span(), |
| }); |
| } |
| } |
| <span class="comment">// c"...", cr"...", cr#"..."# |
| // TODO: add a Lit::CStr variant? |
| </span><span class="string">b'c' </span>=> <span class="kw">return </span>Lit::Verbatim(token), |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <span class="macro">panic!</span>(<span class="string">"Unrecognized literal: `{}`"</span>, repr); |
| } |
| |
| <span class="kw">pub fn </span>suffix(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Lit::Str(lit) => lit.suffix(), |
| Lit::ByteStr(lit) => lit.suffix(), |
| Lit::Byte(lit) => lit.suffix(), |
| Lit::Char(lit) => lit.suffix(), |
| Lit::Int(lit) => lit.suffix(), |
| Lit::Float(lit) => lit.suffix(), |
| Lit::Bool(<span class="kw">_</span>) | Lit::Verbatim(<span class="kw">_</span>) => <span class="string">""</span>, |
| } |
| } |
| |
| <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>{ |
| Lit::Str(lit) => lit.span(), |
| Lit::ByteStr(lit) => lit.span(), |
| Lit::Byte(lit) => lit.span(), |
| Lit::Char(lit) => lit.span(), |
| Lit::Int(lit) => lit.span(), |
| Lit::Float(lit) => lit.span(), |
| Lit::Bool(lit) => lit.span, |
| Lit::Verbatim(lit) => 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>{ |
| Lit::Str(lit) => lit.set_span(span), |
| Lit::ByteStr(lit) => lit.set_span(span), |
| Lit::Byte(lit) => lit.set_span(span), |
| Lit::Char(lit) => lit.set_span(span), |
| Lit::Int(lit) => lit.set_span(span), |
| Lit::Float(lit) => lit.set_span(span), |
| Lit::Bool(lit) => lit.span = span, |
| Lit::Verbatim(lit) => lit.set_span(span), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Get the byte at offset idx, or a default of `b'\0'` if we're looking |
| /// past the end of the input buffer. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>byte<S: AsRef<[u8]> + <span class="question-mark">?</span>Sized>(s: <span class="kw-2">&</span>S, idx: usize) -> u8 { |
| <span class="kw">let </span>s = s.as_ref(); |
| <span class="kw">if </span>idx < s.len() { |
| s[idx] |
| } <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">fn </span>next_chr(s: <span class="kw-2">&</span>str) -> char { |
| s.chars().next().unwrap_or(<span class="string">'\0'</span>) |
| } |
| |
| <span class="comment">// Returns (content, suffix). |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_str(s: <span class="kw-2">&</span>str) -> (Box<str>, Box<str>) { |
| <span class="kw">match </span>byte(s, <span class="number">0</span>) { |
| <span class="string">b'"' </span>=> parse_lit_str_cooked(s), |
| <span class="string">b'r' </span>=> parse_lit_str_raw(s), |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="comment">// Clippy false positive |
| // https://github.com/rust-lang-nursery/rust-clippy/issues/2329 |
| </span><span class="attribute">#[allow(clippy::needless_continue)] |
| </span><span class="kw">fn </span>parse_lit_str_cooked(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> (Box<str>, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'"'</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>content = String::new(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>ch = <span class="kw">match </span>byte(s, <span class="number">0</span>) { |
| <span class="string">b'"' </span>=> <span class="kw">break</span>, |
| <span class="string">b'\\' </span>=> { |
| <span class="kw">let </span>b = byte(s, <span class="number">1</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="kw">match </span>b { |
| <span class="string">b'x' </span>=> { |
| <span class="kw">let </span>(byte, rest) = backslash_x(s); |
| s = rest; |
| <span class="macro">assert!</span>(byte <= <span class="number">0x80</span>, <span class="string">"Invalid \\x byte in string literal"</span>); |
| char::from_u32(u32::from(byte)).unwrap() |
| } |
| <span class="string">b'u' </span>=> { |
| <span class="kw">let </span>(chr, rest) = backslash_u(s); |
| s = rest; |
| chr |
| } |
| <span class="string">b'n' </span>=> <span class="string">'\n'</span>, |
| <span class="string">b'r' </span>=> <span class="string">'\r'</span>, |
| <span class="string">b't' </span>=> <span class="string">'\t'</span>, |
| <span class="string">b'\\' </span>=> <span class="string">'\\'</span>, |
| <span class="string">b'0' </span>=> <span class="string">'\0'</span>, |
| <span class="string">b'\'' </span>=> <span class="string">'\''</span>, |
| <span class="string">b'"' </span>=> <span class="string">'"'</span>, |
| <span class="string">b'\r' </span>| <span class="string">b'\n' </span>=> <span class="kw">loop </span>{ |
| <span class="kw">let </span>b = byte(s, <span class="number">0</span>); |
| <span class="kw">match </span>b { |
| <span class="string">b' ' </span>| <span class="string">b'\t' </span>| <span class="string">b'\n' </span>| <span class="string">b'\r' </span>=> s = <span class="kw-2">&</span>s[<span class="number">1</span>..], |
| <span class="kw">_ </span>=> <span class="kw">continue </span><span class="lifetime">'outer</span>, |
| } |
| }, |
| b => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, b), |
| } |
| } |
| <span class="string">b'\r' </span>=> { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">1</span>), <span class="string">b'\n'</span>, <span class="string">"Bare CR not allowed in string"</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="string">'\n' |
| </span>} |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>ch = next_chr(s); |
| s = <span class="kw-2">&</span>s[ch.len_utf8()..]; |
| ch |
| } |
| }; |
| content.push(ch); |
| } |
| |
| <span class="macro">assert!</span>(s.starts_with(<span class="string">'"'</span>)); |
| <span class="kw">let </span>content = content.into_boxed_str(); |
| <span class="kw">let </span>suffix = s[<span class="number">1</span>..].to_owned().into_boxed_str(); |
| (content, suffix) |
| } |
| |
| <span class="kw">fn </span>parse_lit_str_raw(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> (Box<str>, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'r'</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pounds = <span class="number">0</span>; |
| <span class="kw">while </span>byte(s, pounds) == <span class="string">b'#' </span>{ |
| pounds += <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(byte(s, pounds), <span class="string">b'"'</span>); |
| <span class="kw">let </span>close = s.rfind(<span class="string">'"'</span>).unwrap(); |
| <span class="kw">for </span>end <span class="kw">in </span>s[close + <span class="number">1</span>..close + <span class="number">1 </span>+ pounds].bytes() { |
| <span class="macro">assert_eq!</span>(end, <span class="string">b'#'</span>); |
| } |
| |
| <span class="kw">let </span>content = s[pounds + <span class="number">1</span>..close].to_owned().into_boxed_str(); |
| <span class="kw">let </span>suffix = s[close + <span class="number">1 </span>+ pounds..].to_owned().into_boxed_str(); |
| (content, suffix) |
| } |
| |
| <span class="comment">// Returns (content, suffix). |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_byte_str(s: <span class="kw-2">&</span>str) -> (Vec<u8>, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="kw">match </span>byte(s, <span class="number">1</span>) { |
| <span class="string">b'"' </span>=> parse_lit_byte_str_cooked(s), |
| <span class="string">b'r' </span>=> parse_lit_byte_str_raw(s), |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="comment">// Clippy false positive |
| // https://github.com/rust-lang-nursery/rust-clippy/issues/2329 |
| </span><span class="attribute">#[allow(clippy::needless_continue)] |
| </span><span class="kw">fn </span>parse_lit_byte_str_cooked(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> (Vec<u8>, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">1</span>), <span class="string">b'"'</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| |
| <span class="comment">// We're going to want to have slices which don't respect codepoint boundaries. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>v = s.as_bytes(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>out = Vec::new(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>byte = <span class="kw">match </span>byte(v, <span class="number">0</span>) { |
| <span class="string">b'"' </span>=> <span class="kw">break</span>, |
| <span class="string">b'\\' </span>=> { |
| <span class="kw">let </span>b = byte(v, <span class="number">1</span>); |
| v = <span class="kw-2">&</span>v[<span class="number">2</span>..]; |
| <span class="kw">match </span>b { |
| <span class="string">b'x' </span>=> { |
| <span class="kw">let </span>(b, rest) = backslash_x(v); |
| v = rest; |
| b |
| } |
| <span class="string">b'n' </span>=> <span class="string">b'\n'</span>, |
| <span class="string">b'r' </span>=> <span class="string">b'\r'</span>, |
| <span class="string">b't' </span>=> <span class="string">b'\t'</span>, |
| <span class="string">b'\\' </span>=> <span class="string">b'\\'</span>, |
| <span class="string">b'0' </span>=> <span class="string">b'\0'</span>, |
| <span class="string">b'\'' </span>=> <span class="string">b'\''</span>, |
| <span class="string">b'"' </span>=> <span class="string">b'"'</span>, |
| <span class="string">b'\r' </span>| <span class="string">b'\n' </span>=> <span class="kw">loop </span>{ |
| <span class="kw">let </span>byte = byte(v, <span class="number">0</span>); |
| <span class="kw">let </span>ch = char::from_u32(u32::from(byte)).unwrap(); |
| <span class="kw">if </span>ch.is_whitespace() { |
| v = <span class="kw-2">&</span>v[<span class="number">1</span>..]; |
| } <span class="kw">else </span>{ |
| <span class="kw">continue </span><span class="lifetime">'outer</span>; |
| } |
| }, |
| b => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, b), |
| } |
| } |
| <span class="string">b'\r' </span>=> { |
| <span class="macro">assert_eq!</span>(byte(v, <span class="number">1</span>), <span class="string">b'\n'</span>, <span class="string">"Bare CR not allowed in string"</span>); |
| v = <span class="kw-2">&</span>v[<span class="number">2</span>..]; |
| <span class="string">b'\n' |
| </span>} |
| b => { |
| v = <span class="kw-2">&</span>v[<span class="number">1</span>..]; |
| b |
| } |
| }; |
| out.push(byte); |
| } |
| |
| <span class="macro">assert_eq!</span>(byte(v, <span class="number">0</span>), <span class="string">b'"'</span>); |
| <span class="kw">let </span>suffix = s[s.len() - v.len() + <span class="number">1</span>..].to_owned().into_boxed_str(); |
| (out, suffix) |
| } |
| |
| <span class="kw">fn </span>parse_lit_byte_str_raw(s: <span class="kw-2">&</span>str) -> (Vec<u8>, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="kw">let </span>(value, suffix) = parse_lit_str_raw(<span class="kw-2">&</span>s[<span class="number">1</span>..]); |
| (String::from(value).into_bytes(), suffix) |
| } |
| |
| <span class="comment">// Returns (value, suffix). |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_byte(s: <span class="kw-2">&</span>str) -> (u8, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">1</span>), <span class="string">b'\''</span>); |
| |
| <span class="comment">// We're going to want to have slices which don't respect codepoint boundaries. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>v = s[<span class="number">2</span>..].as_bytes(); |
| |
| <span class="kw">let </span>b = <span class="kw">match </span>byte(v, <span class="number">0</span>) { |
| <span class="string">b'\\' </span>=> { |
| <span class="kw">let </span>b = byte(v, <span class="number">1</span>); |
| v = <span class="kw-2">&</span>v[<span class="number">2</span>..]; |
| <span class="kw">match </span>b { |
| <span class="string">b'x' </span>=> { |
| <span class="kw">let </span>(b, rest) = backslash_x(v); |
| v = rest; |
| b |
| } |
| <span class="string">b'n' </span>=> <span class="string">b'\n'</span>, |
| <span class="string">b'r' </span>=> <span class="string">b'\r'</span>, |
| <span class="string">b't' </span>=> <span class="string">b'\t'</span>, |
| <span class="string">b'\\' </span>=> <span class="string">b'\\'</span>, |
| <span class="string">b'0' </span>=> <span class="string">b'\0'</span>, |
| <span class="string">b'\'' </span>=> <span class="string">b'\''</span>, |
| <span class="string">b'"' </span>=> <span class="string">b'"'</span>, |
| b => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, b), |
| } |
| } |
| b => { |
| v = <span class="kw-2">&</span>v[<span class="number">1</span>..]; |
| b |
| } |
| }; |
| |
| <span class="macro">assert_eq!</span>(byte(v, <span class="number">0</span>), <span class="string">b'\''</span>); |
| <span class="kw">let </span>suffix = s[s.len() - v.len() + <span class="number">1</span>..].to_owned().into_boxed_str(); |
| (b, suffix) |
| } |
| |
| <span class="comment">// Returns (value, suffix). |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_char(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> (char, Box<str>) { |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'\''</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="kw">let </span>ch = <span class="kw">match </span>byte(s, <span class="number">0</span>) { |
| <span class="string">b'\\' </span>=> { |
| <span class="kw">let </span>b = byte(s, <span class="number">1</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="kw">match </span>b { |
| <span class="string">b'x' </span>=> { |
| <span class="kw">let </span>(byte, rest) = backslash_x(s); |
| s = rest; |
| <span class="macro">assert!</span>(byte <= <span class="number">0x80</span>, <span class="string">"Invalid \\x byte in string literal"</span>); |
| char::from_u32(u32::from(byte)).unwrap() |
| } |
| <span class="string">b'u' </span>=> { |
| <span class="kw">let </span>(chr, rest) = backslash_u(s); |
| s = rest; |
| chr |
| } |
| <span class="string">b'n' </span>=> <span class="string">'\n'</span>, |
| <span class="string">b'r' </span>=> <span class="string">'\r'</span>, |
| <span class="string">b't' </span>=> <span class="string">'\t'</span>, |
| <span class="string">b'\\' </span>=> <span class="string">'\\'</span>, |
| <span class="string">b'0' </span>=> <span class="string">'\0'</span>, |
| <span class="string">b'\'' </span>=> <span class="string">'\''</span>, |
| <span class="string">b'"' </span>=> <span class="string">'"'</span>, |
| b => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, b), |
| } |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>ch = next_chr(s); |
| s = <span class="kw-2">&</span>s[ch.len_utf8()..]; |
| ch |
| } |
| }; |
| <span class="macro">assert_eq!</span>(byte(s, <span class="number">0</span>), <span class="string">b'\''</span>); |
| <span class="kw">let </span>suffix = s[<span class="number">1</span>..].to_owned().into_boxed_str(); |
| (ch, suffix) |
| } |
| |
| <span class="kw">fn </span>backslash_x<S>(s: <span class="kw-2">&</span>S) -> (u8, <span class="kw-2">&</span>S) |
| <span class="kw">where |
| </span>S: Index<RangeFrom<usize>, Output = S> + AsRef<[u8]> + <span class="question-mark">?</span>Sized, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>ch = <span class="number">0</span>; |
| <span class="kw">let </span>b0 = byte(s, <span class="number">0</span>); |
| <span class="kw">let </span>b1 = byte(s, <span class="number">1</span>); |
| ch += <span class="number">0x10 |
| </span>* <span class="kw">match </span>b0 { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> b0 - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> <span class="number">10 </span>+ (b0 - <span class="string">b'a'</span>), |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> <span class="number">10 </span>+ (b0 - <span class="string">b'A'</span>), |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\x"</span>), |
| }; |
| ch += <span class="kw">match </span>b1 { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> b1 - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> <span class="number">10 </span>+ (b1 - <span class="string">b'a'</span>), |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> <span class="number">10 </span>+ (b1 - <span class="string">b'A'</span>), |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\x"</span>), |
| }; |
| (ch, <span class="kw-2">&</span>s[<span class="number">2</span>..]) |
| } |
| |
| <span class="kw">fn </span>backslash_u(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> (char, <span class="kw-2">&</span>str) { |
| <span class="kw">if </span>byte(s, <span class="number">0</span>) != <span class="string">b'{' </span>{ |
| <span class="macro">panic!</span>(<span class="string">"{}"</span>, <span class="string">"expected { after \\u"</span>); |
| } |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ch = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>digits = <span class="number">0</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>b = byte(s, <span class="number">0</span>); |
| <span class="kw">let </span>digit = <span class="kw">match </span>b { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> b - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> <span class="number">10 </span>+ b - <span class="string">b'a'</span>, |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> <span class="number">10 </span>+ b - <span class="string">b'A'</span>, |
| <span class="string">b'_' </span><span class="kw">if </span>digits > <span class="number">0 </span>=> { |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| <span class="kw">continue</span>; |
| } |
| <span class="string">b'}' </span><span class="kw">if </span>digits == <span class="number">0 </span>=> <span class="macro">panic!</span>(<span class="string">"invalid empty unicode escape"</span>), |
| <span class="string">b'}' </span>=> <span class="kw">break</span>, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\u"</span>), |
| }; |
| <span class="kw">if </span>digits == <span class="number">6 </span>{ |
| <span class="macro">panic!</span>(<span class="string">"overlong unicode escape (must have at most 6 hex digits)"</span>); |
| } |
| ch <span class="kw-2">*</span>= <span class="number">0x10</span>; |
| ch += u32::from(digit); |
| digits += <span class="number">1</span>; |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| } |
| <span class="macro">assert!</span>(byte(s, <span class="number">0</span>) == <span class="string">b'}'</span>); |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ch) = char::from_u32(ch) { |
| (ch, s) |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"character code {:x} is not a valid unicode character"</span>, ch); |
| } |
| } |
| |
| <span class="comment">// Returns base 10 digits and suffix. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_int(<span class="kw-2">mut </span>s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><(Box<str>, Box<str>)> { |
| <span class="kw">let </span>negative = byte(s, <span class="number">0</span>) == <span class="string">b'-'</span>; |
| <span class="kw">if </span>negative { |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| } |
| |
| <span class="kw">let </span>base = <span class="kw">match </span>(byte(s, <span class="number">0</span>), byte(s, <span class="number">1</span>)) { |
| (<span class="string">b'0'</span>, <span class="string">b'x'</span>) => { |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="number">16 |
| </span>} |
| (<span class="string">b'0'</span>, <span class="string">b'o'</span>) => { |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="number">8 |
| </span>} |
| (<span class="string">b'0'</span>, <span class="string">b'b'</span>) => { |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| <span class="number">2 |
| </span>} |
| (<span class="string">b'0'</span>..=<span class="string">b'9'</span>, <span class="kw">_</span>) => <span class="number">10</span>, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>value = BigInt::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>has_digit = <span class="bool-val">false</span>; |
| <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>b = byte(s, <span class="number">0</span>); |
| <span class="kw">let </span>digit = <span class="kw">match </span>b { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> b - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span><span class="kw">if </span>base > <span class="number">10 </span>=> b - <span class="string">b'a' </span>+ <span class="number">10</span>, |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span><span class="kw">if </span>base > <span class="number">10 </span>=> b - <span class="string">b'A' </span>+ <span class="number">10</span>, |
| <span class="string">b'_' </span>=> { |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| <span class="kw">continue</span>; |
| } |
| <span class="comment">// If looking at a floating point literal, we don't want to |
| // consider it an integer. |
| </span><span class="string">b'.' </span><span class="kw">if </span>base == <span class="number">10 </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="string">b'e' </span>| <span class="string">b'E' </span><span class="kw">if </span>base == <span class="number">10 </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>has_exp = <span class="bool-val">false</span>; |
| <span class="kw">for </span>(i, b) <span class="kw">in </span>s[<span class="number">1</span>..].bytes().enumerate() { |
| <span class="kw">match </span>b { |
| <span class="string">b'_' </span>=> {} |
| <span class="string">b'-' </span>| <span class="string">b'+' </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> has_exp = <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>suffix = <span class="kw-2">&</span>s[<span class="number">1 </span>+ i..]; |
| <span class="kw">if </span>has_exp && <span class="kw">crate</span>::ident::xid_ok(suffix) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break </span><span class="lifetime">'outer</span>; |
| } |
| } |
| } |
| } |
| <span class="kw">if </span>has_exp { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| }; |
| |
| <span class="kw">if </span>digit >= base { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| has_digit = <span class="bool-val">true</span>; |
| value <span class="kw-2">*</span>= base; |
| value += digit; |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| } |
| |
| <span class="kw">if </span>!has_digit { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>suffix = s; |
| <span class="kw">if </span>suffix.is_empty() || <span class="kw">crate</span>::ident::xid_ok(suffix) { |
| <span class="kw">let </span><span class="kw-2">mut </span>repr = value.to_string(); |
| <span class="kw">if </span>negative { |
| repr.insert(<span class="number">0</span>, <span class="string">'-'</span>); |
| } |
| <span class="prelude-val">Some</span>((repr.into_boxed_str(), suffix.to_owned().into_boxed_str())) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="comment">// Returns base 10 digits and suffix. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_lit_float(input: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><(Box<str>, Box<str>)> { |
| <span class="comment">// Rust's floating point literals are very similar to the ones parsed by |
| // the standard library, except that rust's literals can contain |
| // ignorable underscores. Let's remove those underscores. |
| |
| </span><span class="kw">let </span><span class="kw-2">mut </span>bytes = input.to_owned().into_bytes(); |
| |
| <span class="kw">let </span>start = (<span class="kw-2">*</span>bytes.first()<span class="question-mark">? </span>== <span class="string">b'-'</span>) <span class="kw">as </span>usize; |
| <span class="kw">match </span>bytes.get(start)<span class="question-mark">? </span>{ |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> {} |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>read = start; |
| <span class="kw">let </span><span class="kw-2">mut </span>write = start; |
| <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_e = <span class="bool-val">false</span>; |
| <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_exponent = <span class="bool-val">false</span>; |
| <span class="kw">while </span>read < bytes.len() { |
| <span class="kw">match </span>bytes[read] { |
| <span class="string">b'_' </span>=> { |
| <span class="comment">// Don't increase write |
| </span>read += <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="kw">if </span>has_e { |
| has_exponent = <span class="bool-val">true</span>; |
| } |
| bytes[write] = bytes[read]; |
| } |
| <span class="string">b'.' </span>=> { |
| <span class="kw">if </span>has_e || has_dot { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| has_dot = <span class="bool-val">true</span>; |
| bytes[write] = <span class="string">b'.'</span>; |
| } |
| <span class="string">b'e' </span>| <span class="string">b'E' </span>=> { |
| <span class="kw">match </span>bytes[read + <span class="number">1</span>..] |
| .iter() |
| .find(|b| <span class="kw-2">**</span>b != <span class="string">b'_'</span>) |
| .unwrap_or(<span class="kw-2">&</span><span class="string">b'\0'</span>) |
| { |
| <span class="string">b'-' </span>| <span class="string">b'+' </span>| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> {} |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| <span class="kw">if </span>has_e { |
| <span class="kw">if </span>has_exponent { |
| <span class="kw">break</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| has_e = <span class="bool-val">true</span>; |
| bytes[write] = <span class="string">b'e'</span>; |
| } |
| <span class="string">b'-' </span>| <span class="string">b'+' </span>=> { |
| <span class="kw">if </span>has_sign || has_exponent || !has_e { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| has_sign = <span class="bool-val">true</span>; |
| <span class="kw">if </span>bytes[read] == <span class="string">b'-' </span>{ |
| bytes[write] = bytes[read]; |
| } <span class="kw">else </span>{ |
| <span class="comment">// Omit '+' |
| </span>read += <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| } |
| <span class="kw">_ </span>=> <span class="kw">break</span>, |
| } |
| read += <span class="number">1</span>; |
| write += <span class="number">1</span>; |
| } |
| |
| <span class="kw">if </span>has_e && !has_exponent { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>digits = String::from_utf8(bytes).unwrap(); |
| <span class="kw">let </span>suffix = digits.split_off(read); |
| digits.truncate(write); |
| <span class="kw">if </span>suffix.is_empty() || <span class="kw">crate</span>::ident::xid_ok(<span class="kw-2">&</span>suffix) { |
| <span class="prelude-val">Some</span>((digits.into_boxed_str(), suffix.into_boxed_str())) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |