| <!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/punctuated.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>punctuated.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="1076">1076</span> |
| <span id="1077">1077</span> |
| <span id="1078">1078</span> |
| <span id="1079">1079</span> |
| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
| <span id="1082">1082</span> |
| <span id="1083">1083</span> |
| <span id="1084">1084</span> |
| <span id="1085">1085</span> |
| <span id="1086">1086</span> |
| <span id="1087">1087</span> |
| <span id="1088">1088</span> |
| <span id="1089">1089</span> |
| <span id="1090">1090</span> |
| <span id="1091">1091</span> |
| <span id="1092">1092</span> |
| <span id="1093">1093</span> |
| <span id="1094">1094</span> |
| <span id="1095">1095</span> |
| <span id="1096">1096</span> |
| <span id="1097">1097</span> |
| <span id="1098">1098</span> |
| <span id="1099">1099</span> |
| <span id="1100">1100</span> |
| <span id="1101">1101</span> |
| <span id="1102">1102</span> |
| <span id="1103">1103</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! A punctuated sequence of syntax tree nodes separated by punctuation. |
| //! |
| //! Lots of things in Rust are punctuated sequences. |
| //! |
| //! - The fields of a struct are `Punctuated<Field, Token![,]>`. |
| //! - The segments of a path are `Punctuated<PathSegment, Token![::]>`. |
| //! - The bounds on a generic parameter are `Punctuated<TypeParamBound, |
| //! Token![+]>`. |
| //! - The arguments to a function call are `Punctuated<Expr, Token![,]>`. |
| //! |
| //! This module provides a common representation for these punctuated sequences |
| //! in the form of the [`Punctuated<T, P>`] type. We store a vector of pairs of |
| //! syntax tree node + punctuation, where every node in the sequence is followed |
| //! by punctuation except for possibly the final one. |
| //! |
| //! [`Punctuated<T, P>`]: Punctuated |
| //! |
| //! ```text |
| //! a_function_call(arg1, arg2, arg3); |
| //! ~~~~^ ~~~~^ ~~~~ |
| //! ``` |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| </span><span class="kw">use </span>std::fmt::{<span class="self">self</span>, Debug}; |
| <span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| </span><span class="kw">use </span>std::hash::{Hash, Hasher}; |
| <span class="attribute">#[cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))] |
| </span><span class="kw">use </span>std::iter; |
| <span class="kw">use </span>std::ops::{Index, IndexMut}; |
| <span class="kw">use </span>std::option; |
| <span class="kw">use </span>std::slice; |
| <span class="kw">use </span>std::vec; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::drops::{NoDrop, TrivialDrop}; |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::token::Token; |
| |
| <span class="doccomment">/// **A punctuated sequence of syntax tree nodes of type `T` separated by |
| /// punctuation of type `P`.** |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>Punctuated<T, P> { |
| inner: Vec<(T, P)>, |
| last: <span class="prelude-ty">Option</span><Box<T>>, |
| } |
| |
| <span class="kw">impl</span><T, P> Punctuated<T, P> { |
| <span class="doccomment">/// Creates an empty punctuated sequence. |
| </span><span class="kw">pub const fn </span>new() -> <span class="self">Self </span>{ |
| Punctuated { |
| inner: Vec::new(), |
| last: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Determines whether this punctuated sequence is empty, meaning it |
| /// contains no syntax tree nodes or punctuation. |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.inner.len() == <span class="number">0 </span>&& <span class="self">self</span>.last.is_none() |
| } |
| |
| <span class="doccomment">/// Returns the number of syntax tree nodes in this punctuated sequence. |
| /// |
| /// This is the number of nodes of type `T`, not counting the punctuation of |
| /// type `P`. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="kw">if </span><span class="self">self</span>.last.is_some() { <span class="number">1 </span>} <span class="kw">else </span>{ <span class="number">0 </span>} |
| } |
| |
| <span class="doccomment">/// Borrows the first element in this sequence. |
| </span><span class="kw">pub fn </span>first(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>T> { |
| <span class="self">self</span>.iter().next() |
| } |
| |
| <span class="doccomment">/// Mutably borrows the first element in this sequence. |
| </span><span class="kw">pub fn </span>first_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>T> { |
| <span class="self">self</span>.iter_mut().next() |
| } |
| |
| <span class="doccomment">/// Borrows the last element in this sequence. |
| </span><span class="kw">pub fn </span>last(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>T> { |
| <span class="self">self</span>.iter().next_back() |
| } |
| |
| <span class="doccomment">/// Mutably borrows the last element in this sequence. |
| </span><span class="kw">pub fn </span>last_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>T> { |
| <span class="self">self</span>.iter_mut().next_back() |
| } |
| |
| <span class="doccomment">/// Returns an iterator over borrowed syntax tree nodes of type `&T`. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> Iter<T> { |
| Iter { |
| inner: Box::new(NoDrop::new(PrivateIter { |
| inner: <span class="self">self</span>.inner.iter(), |
| last: <span class="self">self</span>.last.as_ref().map(Box::as_ref).into_iter(), |
| })), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an iterator over mutably borrowed syntax tree nodes of type |
| /// `&mut T`. |
| </span><span class="kw">pub fn </span>iter_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> IterMut<T> { |
| IterMut { |
| inner: Box::new(NoDrop::new(PrivateIterMut { |
| inner: <span class="self">self</span>.inner.iter_mut(), |
| last: <span class="self">self</span>.last.as_mut().map(Box::as_mut).into_iter(), |
| })), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an iterator over the contents of this sequence as borrowed |
| /// punctuated pairs. |
| </span><span class="kw">pub fn </span>pairs(<span class="kw-2">&</span><span class="self">self</span>) -> Pairs<T, P> { |
| Pairs { |
| inner: <span class="self">self</span>.inner.iter(), |
| last: <span class="self">self</span>.last.as_ref().map(Box::as_ref).into_iter(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an iterator over the contents of this sequence as mutably |
| /// borrowed punctuated pairs. |
| </span><span class="kw">pub fn </span>pairs_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> PairsMut<T, P> { |
| PairsMut { |
| inner: <span class="self">self</span>.inner.iter_mut(), |
| last: <span class="self">self</span>.last.as_mut().map(Box::as_mut).into_iter(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an iterator over the contents of this sequence as owned |
| /// punctuated pairs. |
| </span><span class="kw">pub fn </span>into_pairs(<span class="self">self</span>) -> IntoPairs<T, P> { |
| IntoPairs { |
| inner: <span class="self">self</span>.inner.into_iter(), |
| last: <span class="self">self</span>.last.map(|t| <span class="kw-2">*</span>t).into_iter(), |
| } |
| } |
| |
| <span class="doccomment">/// Appends a syntax tree node onto the end of this punctuated sequence. The |
| /// sequence must already have a trailing punctuation, or be empty. |
| /// |
| /// Use [`push`] instead if the punctuated sequence may or may not already |
| /// have trailing punctuation. |
| /// |
| /// [`push`]: Punctuated::push |
| /// |
| /// # Panics |
| /// |
| /// Panics if the sequence is nonempty and does not already have a trailing |
| /// punctuation. |
| </span><span class="kw">pub fn </span>push_value(<span class="kw-2">&mut </span><span class="self">self</span>, value: T) { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.empty_or_trailing(), |
| <span class="string">"Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation"</span>, |
| ); |
| |
| <span class="self">self</span>.last = <span class="prelude-val">Some</span>(Box::new(value)); |
| } |
| |
| <span class="doccomment">/// Appends a trailing punctuation onto the end of this punctuated sequence. |
| /// The sequence must be non-empty and must not already have trailing |
| /// punctuation. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the sequence is empty or already has a trailing punctuation. |
| </span><span class="kw">pub fn </span>push_punct(<span class="kw-2">&mut </span><span class="self">self</span>, punctuation: P) { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.last.is_some(), |
| <span class="string">"Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation"</span>, |
| ); |
| |
| <span class="kw">let </span>last = <span class="self">self</span>.last.take().unwrap(); |
| <span class="self">self</span>.inner.push((<span class="kw-2">*</span>last, punctuation)); |
| } |
| |
| <span class="doccomment">/// Removes the last punctuated pair from this sequence, or `None` if the |
| /// sequence is empty. |
| </span><span class="kw">pub fn </span>pop(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Pair<T, P>> { |
| <span class="kw">if </span><span class="self">self</span>.last.is_some() { |
| <span class="self">self</span>.last.take().map(|t| Pair::End(<span class="kw-2">*</span>t)) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.inner.pop().map(|(t, p)| Pair::Punctuated(t, p)) |
| } |
| } |
| |
| <span class="doccomment">/// Removes the trailing punctuation from this punctuated sequence, or |
| /// `None` if there isn't any. |
| </span><span class="kw">pub fn </span>pop_punct(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><P> { |
| <span class="kw">if </span><span class="self">self</span>.last.is_some() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>(t, p) = <span class="self">self</span>.inner.pop()<span class="question-mark">?</span>; |
| <span class="self">self</span>.last = <span class="prelude-val">Some</span>(Box::new(t)); |
| <span class="prelude-val">Some</span>(p) |
| } |
| } |
| |
| <span class="doccomment">/// Determines whether this punctuated sequence ends with a trailing |
| /// punctuation. |
| </span><span class="kw">pub fn </span>trailing_punct(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.last.is_none() && !<span class="self">self</span>.is_empty() |
| } |
| |
| <span class="doccomment">/// Returns true if either this `Punctuated` is empty, or it has a trailing |
| /// punctuation. |
| /// |
| /// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`. |
| </span><span class="kw">pub fn </span>empty_or_trailing(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.last.is_none() |
| } |
| |
| <span class="doccomment">/// Appends a syntax tree node onto the end of this punctuated sequence. |
| /// |
| /// If there is not a trailing punctuation in this sequence when this method |
| /// is called, the default value of punctuation type `P` is inserted before |
| /// the given value of type `T`. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, value: T) |
| <span class="kw">where |
| </span>P: Default, |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.empty_or_trailing() { |
| <span class="self">self</span>.push_punct(Default::default()); |
| } |
| <span class="self">self</span>.push_value(value); |
| } |
| |
| <span class="doccomment">/// Inserts an element at position `index`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `index` is greater than the number of elements previously in |
| /// this punctuated sequence. |
| </span><span class="kw">pub fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize, value: T) |
| <span class="kw">where |
| </span>P: Default, |
| { |
| <span class="macro">assert!</span>( |
| index <= <span class="self">self</span>.len(), |
| <span class="string">"Punctuated::insert: index out of range"</span>, |
| ); |
| |
| <span class="kw">if </span>index == <span class="self">self</span>.len() { |
| <span class="self">self</span>.push(value); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.inner.insert(index, (value, Default::default())); |
| } |
| } |
| |
| <span class="doccomment">/// Clears the sequence of all values and punctuation, making it empty. |
| </span><span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.inner.clear(); |
| <span class="self">self</span>.last = <span class="prelude-val">None</span>; |
| } |
| |
| <span class="doccomment">/// Parses zero or more occurrences of `T` separated by punctuation of type |
| /// `P`, with optional trailing punctuation. |
| /// |
| /// Parsing continues until the end of this parse stream. The entire content |
| /// of this parse stream must consist of `T` and `P`. |
| </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_terminated(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> |
| <span class="kw">where |
| </span>T: Parse, |
| P: Parse, |
| { |
| <span class="self">Self</span>::parse_terminated_with(input, T::parse) |
| } |
| |
| <span class="doccomment">/// Parses zero or more occurrences of `T` using the given parse function, |
| /// separated by punctuation of type `P`, with optional trailing |
| /// punctuation. |
| /// |
| /// Like [`parse_terminated`], the entire content of this stream is expected |
| /// to be parsed. |
| /// |
| /// [`parse_terminated`]: Punctuated::parse_terminated |
| </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_terminated_with( |
| input: ParseStream, |
| parser: <span class="kw">fn</span>(ParseStream) -> <span class="prelude-ty">Result</span><T>, |
| ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> |
| <span class="kw">where |
| </span>P: Parse, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>punctuated = Punctuated::new(); |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>input.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>value = parser(input)<span class="question-mark">?</span>; |
| punctuated.push_value(value); |
| <span class="kw">if </span>input.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>punct = input.parse()<span class="question-mark">?</span>; |
| punctuated.push_punct(punct); |
| } |
| |
| <span class="prelude-val">Ok</span>(punctuated) |
| } |
| |
| <span class="doccomment">/// Parses one or more occurrences of `T` separated by punctuation of type |
| /// `P`, not accepting trailing punctuation. |
| /// |
| /// Parsing continues as long as punctuation `P` is present at the head of |
| /// the stream. This method returns upon parsing a `T` and observing that it |
| /// is not followed by a `P`, even if there are remaining tokens in the |
| /// stream. |
| </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_separated_nonempty(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> |
| <span class="kw">where |
| </span>T: Parse, |
| P: Token + Parse, |
| { |
| <span class="self">Self</span>::parse_separated_nonempty_with(input, T::parse) |
| } |
| |
| <span class="doccomment">/// Parses one or more occurrences of `T` using the given parse function, |
| /// separated by punctuation of type `P`, not accepting trailing |
| /// punctuation. |
| /// |
| /// Like [`parse_separated_nonempty`], may complete early without parsing |
| /// the entire content of this stream. |
| /// |
| /// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty |
| </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_separated_nonempty_with( |
| input: ParseStream, |
| parser: <span class="kw">fn</span>(ParseStream) -> <span class="prelude-ty">Result</span><T>, |
| ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> |
| <span class="kw">where |
| </span>P: Token + Parse, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>punctuated = Punctuated::new(); |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>value = parser(input)<span class="question-mark">?</span>; |
| punctuated.push_value(value); |
| <span class="kw">if </span>!P::peek(input.cursor()) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>punct = input.parse()<span class="question-mark">?</span>; |
| punctuated.push_punct(punct); |
| } |
| |
| <span class="prelude-val">Ok</span>(punctuated) |
| } |
| } |
| |
| <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><T, P> Clone <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>T: Clone, |
| P: Clone, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Punctuated { |
| inner: <span class="self">self</span>.inner.clone(), |
| last: <span class="self">self</span>.last.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><T, P> Eq <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>T: Eq, |
| P: Eq, |
| { |
| } |
| |
| <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><T, P> PartialEq <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>T: PartialEq, |
| P: PartialEq, |
| { |
| <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="kw">let </span>Punctuated { inner, last } = <span class="self">self</span>; |
| <span class="kw-2">*</span>inner == other.inner && <span class="kw-2">*</span>last == other.last |
| } |
| } |
| |
| <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><T, P> Hash <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>T: Hash, |
| P: Hash, |
| { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <span class="kw">let </span>Punctuated { inner, last } = <span class="self">self</span>; |
| inner.hash(state); |
| last.hash(state); |
| } |
| } |
| |
| <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><T: Debug, P: Debug> Debug <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>list = f.debug_list(); |
| <span class="kw">for </span>(t, p) <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.inner { |
| list.entry(t); |
| list.entry(p); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(last) = <span class="kw-2">&</span><span class="self">self</span>.last { |
| list.entry(last); |
| } |
| list.finish() |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> FromIterator<T> <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>P: Default, |
| { |
| <span class="kw">fn </span>from_iter<I: IntoIterator<Item = T>>(i: I) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = Punctuated::new(); |
| ret.extend(i); |
| ret |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> Extend<T> <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>P: Default, |
| { |
| <span class="kw">fn </span>extend<I: IntoIterator<Item = T>>(<span class="kw-2">&mut </span><span class="self">self</span>, i: I) { |
| <span class="kw">for </span>value <span class="kw">in </span>i { |
| <span class="self">self</span>.push(value); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> FromIterator<Pair<T, P>> <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">fn </span>from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = Punctuated::new(); |
| do_extend(<span class="kw-2">&mut </span>ret, i.into_iter()); |
| ret |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> Extend<Pair<T, P>> <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>P: Default, |
| { |
| <span class="kw">fn </span>extend<I: IntoIterator<Item = Pair<T, P>>>(<span class="kw-2">&mut </span><span class="self">self</span>, i: I) { |
| <span class="kw">if </span>!<span class="self">self</span>.empty_or_trailing() { |
| <span class="self">self</span>.push_punct(P::default()); |
| } |
| do_extend(<span class="self">self</span>, i.into_iter()); |
| } |
| } |
| |
| <span class="kw">fn </span>do_extend<T, P, I>(punctuated: <span class="kw-2">&mut </span>Punctuated<T, P>, i: I) |
| <span class="kw">where |
| </span>I: Iterator<Item = Pair<T, P>>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>nomore = <span class="bool-val">false</span>; |
| <span class="kw">for </span>pair <span class="kw">in </span>i { |
| <span class="kw">if </span>nomore { |
| <span class="macro">panic!</span>(<span class="string">"Punctuated extended with items after a Pair::End"</span>); |
| } |
| <span class="kw">match </span>pair { |
| Pair::Punctuated(a, b) => punctuated.inner.push((a, b)), |
| Pair::End(a) => { |
| punctuated.last = <span class="prelude-val">Some</span>(Box::new(a)); |
| nomore = <span class="bool-val">true</span>; |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> IntoIterator <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">type </span>Item = T; |
| <span class="kw">type </span>IntoIter = IntoIter<T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="kw">let </span><span class="kw-2">mut </span>elements = Vec::with_capacity(<span class="self">self</span>.len()); |
| elements.extend(<span class="self">self</span>.inner.into_iter().map(|pair| pair.<span class="number">0</span>)); |
| elements.extend(<span class="self">self</span>.last.map(|t| <span class="kw-2">*</span>t)); |
| |
| IntoIter { |
| inner: elements.into_iter(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Punctuated<T, P> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T; |
| <span class="kw">type </span>IntoIter = Iter<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| Punctuated::iter(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Punctuated<T, P> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T; |
| <span class="kw">type </span>IntoIter = IterMut<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| Punctuated::iter_mut(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> Default <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| Punctuated::new() |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over borrowed pairs of type `Pair<&T, &P>`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>Pairs<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>, P: <span class="lifetime">'a</span>> { |
| inner: slice::Iter<<span class="lifetime">'a</span>, (T, P)>, |
| last: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Iterator <span class="kw">for </span>Pairs<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">type </span>Item = Pair<<span class="kw-2">&</span><span class="lifetime">'a </span>T, <span class="kw-2">&</span><span class="lifetime">'a </span>P>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner |
| .next() |
| .map(|(t, p)| Pair::Punctuated(t, p)) |
| .or_else(|| <span class="self">self</span>.last.next().map(Pair::End)) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> DoubleEndedIterator <span class="kw">for </span>Pairs<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.last |
| .next() |
| .map(Pair::End) |
| .or_else(|| <span class="self">self</span>.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p))) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> ExactSizeIterator <span class="kw">for </span>Pairs<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="self">self</span>.last.len() |
| } |
| } |
| |
| <span class="comment">// No Clone bound on T or P. |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Clone <span class="kw">for </span>Pairs<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Pairs { |
| inner: <span class="self">self</span>.inner.clone(), |
| last: <span class="self">self</span>.last.clone(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over mutably borrowed pairs of type `Pair<&mut T, &mut P>`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>PairsMut<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>, P: <span class="lifetime">'a</span>> { |
| inner: slice::IterMut<<span class="lifetime">'a</span>, (T, P)>, |
| last: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Iterator <span class="kw">for </span>PairsMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">type </span>Item = Pair<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T, <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>P>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner |
| .next() |
| .map(|(t, p)| Pair::Punctuated(t, p)) |
| .or_else(|| <span class="self">self</span>.last.next().map(Pair::End)) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> DoubleEndedIterator <span class="kw">for </span>PairsMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.last |
| .next() |
| .map(Pair::End) |
| .or_else(|| <span class="self">self</span>.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p))) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> ExactSizeIterator <span class="kw">for </span>PairsMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="self">self</span>.last.len() |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over owned pairs of type `Pair<T, P>`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>IntoPairs<T, P> { |
| inner: vec::IntoIter<(T, P)>, |
| last: option::IntoIter<T>, |
| } |
| |
| <span class="kw">impl</span><T, P> Iterator <span class="kw">for </span>IntoPairs<T, P> { |
| <span class="kw">type </span>Item = Pair<T, P>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner |
| .next() |
| .map(|(t, p)| Pair::Punctuated(t, p)) |
| .or_else(|| <span class="self">self</span>.last.next().map(Pair::End)) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> DoubleEndedIterator <span class="kw">for </span>IntoPairs<T, P> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.last |
| .next() |
| .map(Pair::End) |
| .or_else(|| <span class="self">self</span>.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p))) |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> ExactSizeIterator <span class="kw">for </span>IntoPairs<T, P> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="self">self</span>.last.len() |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> Clone <span class="kw">for </span>IntoPairs<T, P> |
| <span class="kw">where |
| </span>T: Clone, |
| P: Clone, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| IntoPairs { |
| inner: <span class="self">self</span>.inner.clone(), |
| last: <span class="self">self</span>.last.clone(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over owned values of type `T`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>IntoIter<T> { |
| inner: vec::IntoIter<T>, |
| } |
| |
| <span class="kw">impl</span><T> Iterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next() |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next_back() |
| } |
| } |
| |
| <span class="kw">impl</span><T> ExactSizeIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() |
| } |
| } |
| |
| <span class="kw">impl</span><T> Clone <span class="kw">for </span>IntoIter<T> |
| <span class="kw">where |
| </span>T: Clone, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| IntoIter { |
| inner: <span class="self">self</span>.inner.clone(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over borrowed values of type `&T`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>Iter<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>> { |
| inner: Box<NoDrop<<span class="kw">dyn </span>IterTrait<<span class="lifetime">'a</span>, T> + <span class="lifetime">'a</span>>>, |
| } |
| |
| <span class="kw">trait </span>IterTrait<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>>: Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T> + DoubleEndedIterator + ExactSizeIterator { |
| <span class="kw">fn </span>clone_box(<span class="kw-2">&</span><span class="self">self</span>) -> Box<NoDrop<<span class="kw">dyn </span>IterTrait<<span class="lifetime">'a</span>, T> + <span class="lifetime">'a</span>>>; |
| } |
| |
| <span class="kw">struct </span>PrivateIter<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>, P: <span class="lifetime">'a</span>> { |
| inner: slice::Iter<<span class="lifetime">'a</span>, (T, P)>, |
| last: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> TrivialDrop <span class="kw">for </span>PrivateIter<<span class="lifetime">'a</span>, T, P> |
| <span class="kw">where |
| </span>slice::Iter<<span class="lifetime">'a</span>, (T, P)>: TrivialDrop, |
| option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span>T>: TrivialDrop, |
| { |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>empty_punctuated_iter<<span class="lifetime">'a</span>, T>() -> Iter<<span class="lifetime">'a</span>, T> { |
| Iter { |
| inner: Box::new(NoDrop::new(iter::empty())), |
| } |
| } |
| |
| <span class="comment">// No Clone bound on T. |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T> Clone <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Iter { |
| inner: <span class="self">self</span>.inner.clone_box(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Iterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next() |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> DoubleEndedIterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next_back() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> ExactSizeIterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Iterator <span class="kw">for </span>PrivateIter<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner |
| .next() |
| .map(|pair| <span class="kw-2">&</span>pair.<span class="number">0</span>) |
| .or_else(|| <span class="self">self</span>.last.next()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> DoubleEndedIterator <span class="kw">for </span>PrivateIter<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.last |
| .next() |
| .or_else(|| <span class="self">self</span>.inner.next_back().map(|pair| <span class="kw-2">&</span>pair.<span class="number">0</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> ExactSizeIterator <span class="kw">for </span>PrivateIter<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="self">self</span>.last.len() |
| } |
| } |
| |
| <span class="comment">// No Clone bound on T or P. |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Clone <span class="kw">for </span>PrivateIter<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| PrivateIter { |
| inner: <span class="self">self</span>.inner.clone(), |
| last: <span class="self">self</span>.last.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, I> IterTrait<<span class="lifetime">'a</span>, T> <span class="kw">for </span>I |
| <span class="kw">where |
| </span>T: <span class="lifetime">'a</span>, |
| I: DoubleEndedIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T> |
| + ExactSizeIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T> |
| + Clone |
| + TrivialDrop |
| + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">fn </span>clone_box(<span class="kw-2">&</span><span class="self">self</span>) -> Box<NoDrop<<span class="kw">dyn </span>IterTrait<<span class="lifetime">'a</span>, T> + <span class="lifetime">'a</span>>> { |
| Box::new(NoDrop::new(<span class="self">self</span>.clone())) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over mutably borrowed values of type `&mut T`. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub struct </span>IterMut<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>> { |
| inner: Box<NoDrop<<span class="kw">dyn </span>IterMutTrait<<span class="lifetime">'a</span>, T, Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T> + <span class="lifetime">'a</span>>>, |
| } |
| |
| <span class="kw">trait </span>IterMutTrait<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>>: |
| DoubleEndedIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T> + ExactSizeIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T> |
| { |
| } |
| |
| <span class="kw">struct </span>PrivateIterMut<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>, P: <span class="lifetime">'a</span>> { |
| inner: slice::IterMut<<span class="lifetime">'a</span>, (T, P)>, |
| last: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> TrivialDrop <span class="kw">for </span>PrivateIterMut<<span class="lifetime">'a</span>, T, P> |
| <span class="kw">where |
| </span>slice::IterMut<<span class="lifetime">'a</span>, (T, P)>: TrivialDrop, |
| option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T>: TrivialDrop, |
| { |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>empty_punctuated_iter_mut<<span class="lifetime">'a</span>, T>() -> IterMut<<span class="lifetime">'a</span>, T> { |
| IterMut { |
| inner: Box::new(NoDrop::new(iter::empty())), |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Iterator <span class="kw">for </span>IterMut<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next() |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> DoubleEndedIterator <span class="kw">for </span>IterMut<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner.next_back() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> ExactSizeIterator <span class="kw">for </span>IterMut<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> Iterator <span class="kw">for </span>PrivateIterMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.inner |
| .next() |
| .map(|pair| <span class="kw-2">&mut </span>pair.<span class="number">0</span>) |
| .or_else(|| <span class="self">self</span>.last.next()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> DoubleEndedIterator <span class="kw">for </span>PrivateIterMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.last |
| .next() |
| .or_else(|| <span class="self">self</span>.inner.next_back().map(|pair| <span class="kw-2">&mut </span>pair.<span class="number">0</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, P> ExactSizeIterator <span class="kw">for </span>PrivateIterMut<<span class="lifetime">'a</span>, T, P> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() + <span class="self">self</span>.last.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, I> IterMutTrait<<span class="lifetime">'a</span>, T> <span class="kw">for </span>I |
| <span class="kw">where |
| </span>T: <span class="lifetime">'a</span>, |
| I: DoubleEndedIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T> + ExactSizeIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T> + <span class="lifetime">'a</span>, |
| { |
| } |
| |
| <span class="doccomment">/// A single syntax tree node of type `T` followed by its trailing punctuation |
| /// of type `P` if any. |
| /// |
| /// Refer to the [module documentation] for details about punctuated sequences. |
| /// |
| /// [module documentation]: self |
| </span><span class="kw">pub enum </span>Pair<T, P> { |
| Punctuated(T, P), |
| End(T), |
| } |
| |
| <span class="kw">impl</span><T, P> Pair<T, P> { |
| <span class="doccomment">/// Extracts the syntax tree node from this punctuated pair, discarding the |
| /// following punctuation. |
| </span><span class="kw">pub fn </span>into_value(<span class="self">self</span>) -> T { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, <span class="kw">_</span>) | Pair::End(t) => t, |
| } |
| } |
| |
| <span class="doccomment">/// Borrows the syntax tree node from this punctuated pair. |
| </span><span class="kw">pub fn </span>value(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, <span class="kw">_</span>) | Pair::End(t) => t, |
| } |
| } |
| |
| <span class="doccomment">/// Mutably borrows the syntax tree node from this punctuated pair. |
| </span><span class="kw">pub fn </span>value_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, <span class="kw">_</span>) | Pair::End(t) => t, |
| } |
| } |
| |
| <span class="doccomment">/// Borrows the punctuation from this punctuated pair, unless this pair is |
| /// the final one and there is no trailing punctuation. |
| </span><span class="kw">pub fn </span>punct(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>P> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(<span class="kw">_</span>, p) => <span class="prelude-val">Some</span>(p), |
| Pair::End(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Mutably borrows the punctuation from this punctuated pair, unless the |
| /// pair is the final one and there is no trailing punctuation. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// # use proc_macro2::Span; |
| /// # use syn::punctuated::Punctuated; |
| /// # use syn::{parse_quote, Token, TypeParamBound}; |
| /// # |
| /// # let mut punctuated = Punctuated::<TypeParamBound, Token![+]>::new(); |
| /// # let span = Span::call_site(); |
| /// # |
| /// punctuated.insert(0, parse_quote!('lifetime)); |
| /// if let Some(punct) = punctuated.pairs_mut().next().unwrap().punct_mut() { |
| /// punct.span = span; |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>punct_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>P> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(<span class="kw">_</span>, p) => <span class="prelude-val">Some</span>(p), |
| Pair::End(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Creates a punctuated pair out of a syntax tree node and an optional |
| /// following punctuation. |
| </span><span class="kw">pub fn </span>new(t: T, p: <span class="prelude-ty">Option</span><P>) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>p { |
| <span class="prelude-val">Some</span>(p) => Pair::Punctuated(t, p), |
| <span class="prelude-val">None </span>=> Pair::End(t), |
| } |
| } |
| |
| <span class="doccomment">/// Produces this punctuated pair as a tuple of syntax tree node and |
| /// optional following punctuation. |
| </span><span class="kw">pub fn </span>into_tuple(<span class="self">self</span>) -> (T, <span class="prelude-ty">Option</span><P>) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, p) => (t, <span class="prelude-val">Some</span>(p)), |
| Pair::End(t) => (t, <span class="prelude-val">None</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><T, P> Pair<<span class="kw-2">&</span>T, <span class="kw-2">&</span>P> { |
| <span class="kw">pub fn </span>cloned(<span class="self">self</span>) -> Pair<T, P> |
| <span class="kw">where |
| </span>T: Clone, |
| P: Clone, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()), |
| Pair::End(t) => Pair::End(t.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><T, P> Clone <span class="kw">for </span>Pair<T, P> |
| <span class="kw">where |
| </span>T: Clone, |
| P: Clone, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()), |
| Pair::End(t) => Pair::End(t.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><T, P> Copy <span class="kw">for </span>Pair<T, P> |
| <span class="kw">where |
| </span>T: Copy, |
| P: Copy, |
| { |
| } |
| |
| <span class="kw">impl</span><T, P> Index<usize> <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">type </span>Output = T; |
| |
| <span class="kw">fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, index: usize) -> <span class="kw-2">&</span><span class="self">Self</span>::Output { |
| <span class="kw">if </span>index == <span class="self">self</span>.len() - <span class="number">1 </span>{ |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.last { |
| <span class="prelude-val">Some</span>(t) => t, |
| <span class="prelude-val">None </span>=> <span class="kw-2">&</span><span class="self">self</span>.inner[index].<span class="number">0</span>, |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw-2">&</span><span class="self">self</span>.inner[index].<span class="number">0 |
| </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><T, P> IndexMut<usize> <span class="kw">for </span>Punctuated<T, P> { |
| <span class="kw">fn </span>index_mut(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Output { |
| <span class="kw">if </span>index == <span class="self">self</span>.len() - <span class="number">1 </span>{ |
| <span class="kw">match </span><span class="kw-2">&mut </span><span class="self">self</span>.last { |
| <span class="prelude-val">Some</span>(t) => t, |
| <span class="prelude-val">None </span>=> <span class="kw-2">&mut </span><span class="self">self</span>.inner[index].<span class="number">0</span>, |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner[index].<span class="number">0 |
| </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><T, P> ToTokens <span class="kw">for </span>Punctuated<T, P> |
| <span class="kw">where |
| </span>T: ToTokens, |
| P: ToTokens, |
| { |
| <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_all(<span class="self">self</span>.pairs()); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl</span><T, P> ToTokens <span class="kw">for </span>Pair<T, P> |
| <span class="kw">where |
| </span>T: ToTokens, |
| P: ToTokens, |
| { |
| <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="kw">match </span><span class="self">self </span>{ |
| Pair::Punctuated(a, b) => { |
| a.to_tokens(tokens); |
| b.to_tokens(tokens); |
| } |
| Pair::End(a) => a.to_tokens(tokens), |
| } |
| } |
| } |
| } |
| </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> |