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-//! 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);
-//! ~~~~^ ~~~~^ ~~~~
-//! ```
-
-#[cfg(feature = "extra-traits")]
-use std::fmt::{self, Debug};
-#[cfg(feature = "extra-traits")]
-use std::hash::{Hash, Hasher};
-#[cfg(any(feature = "full", feature = "derive"))]
-use std::iter;
-use std::ops::{Index, IndexMut};
-use std::option;
-use std::slice;
-use std::vec;
-
-use crate::drops::{NoDrop, TrivialDrop};
-#[cfg(feature = "parsing")]
-use crate::parse::{Parse, ParseStream, Result};
-#[cfg(feature = "parsing")]
-use crate::token::Token;
-
-/// **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
-pub struct Punctuated<T, P> {
- inner: Vec<(T, P)>,
- last: Option<Box<T>>,
-}
-
-impl<T, P> Punctuated<T, P> {
- /// Creates an empty punctuated sequence.
- pub const fn new() -> Self {
- Punctuated {
- inner: Vec::new(),
- last: None,
- }
- }
-
- /// Determines whether this punctuated sequence is empty, meaning it
- /// contains no syntax tree nodes or punctuation.
- pub fn is_empty(&self) -> bool {
- self.inner.len() == 0 && self.last.is_none()
- }
-
- /// 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`.
- pub fn len(&self) -> usize {
- self.inner.len() + if self.last.is_some() { 1 } else { 0 }
- }
-
- /// Borrows the first element in this sequence.
- pub fn first(&self) -> Option<&T> {
- self.iter().next()
- }
-
- /// Mutably borrows the first element in this sequence.
- pub fn first_mut(&mut self) -> Option<&mut T> {
- self.iter_mut().next()
- }
-
- /// Borrows the last element in this sequence.
- pub fn last(&self) -> Option<&T> {
- self.iter().next_back()
- }
-
- /// Mutably borrows the last element in this sequence.
- pub fn last_mut(&mut self) -> Option<&mut T> {
- self.iter_mut().next_back()
- }
-
- /// Returns an iterator over borrowed syntax tree nodes of type `&T`.
- pub fn iter(&self) -> Iter<T> {
- Iter {
- inner: Box::new(NoDrop::new(PrivateIter {
- inner: self.inner.iter(),
- last: self.last.as_ref().map(Box::as_ref).into_iter(),
- })),
- }
- }
-
- /// Returns an iterator over mutably borrowed syntax tree nodes of type
- /// `&mut T`.
- pub fn iter_mut(&mut self) -> IterMut<T> {
- IterMut {
- inner: Box::new(NoDrop::new(PrivateIterMut {
- inner: self.inner.iter_mut(),
- last: self.last.as_mut().map(Box::as_mut).into_iter(),
- })),
- }
- }
-
- /// Returns an iterator over the contents of this sequence as borrowed
- /// punctuated pairs.
- pub fn pairs(&self) -> Pairs<T, P> {
- Pairs {
- inner: self.inner.iter(),
- last: self.last.as_ref().map(Box::as_ref).into_iter(),
- }
- }
-
- /// Returns an iterator over the contents of this sequence as mutably
- /// borrowed punctuated pairs.
- pub fn pairs_mut(&mut self) -> PairsMut<T, P> {
- PairsMut {
- inner: self.inner.iter_mut(),
- last: self.last.as_mut().map(Box::as_mut).into_iter(),
- }
- }
-
- /// Returns an iterator over the contents of this sequence as owned
- /// punctuated pairs.
- pub fn into_pairs(self) -> IntoPairs<T, P> {
- IntoPairs {
- inner: self.inner.into_iter(),
- last: self.last.map(|t| *t).into_iter(),
- }
- }
-
- /// 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.
- pub fn push_value(&mut self, value: T) {
- assert!(
- self.empty_or_trailing(),
- "Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
- );
-
- self.last = Some(Box::new(value));
- }
-
- /// 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.
- pub fn push_punct(&mut self, punctuation: P) {
- assert!(
- self.last.is_some(),
- "Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
- );
-
- let last = self.last.take().unwrap();
- self.inner.push((*last, punctuation));
- }
-
- /// Removes the last punctuated pair from this sequence, or `None` if the
- /// sequence is empty.
- pub fn pop(&mut self) -> Option<Pair<T, P>> {
- if self.last.is_some() {
- self.last.take().map(|t| Pair::End(*t))
- } else {
- self.inner.pop().map(|(t, p)| Pair::Punctuated(t, p))
- }
- }
-
- /// Removes the trailing punctuation from this punctuated sequence, or
- /// `None` if there isn't any.
- pub fn pop_punct(&mut self) -> Option<P> {
- if self.last.is_some() {
- None
- } else {
- let (t, p) = self.inner.pop()?;
- self.last = Some(Box::new(t));
- Some(p)
- }
- }
-
- /// Determines whether this punctuated sequence ends with a trailing
- /// punctuation.
- pub fn trailing_punct(&self) -> bool {
- self.last.is_none() && !self.is_empty()
- }
-
- /// Returns true if either this `Punctuated` is empty, or it has a trailing
- /// punctuation.
- ///
- /// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.
- pub fn empty_or_trailing(&self) -> bool {
- self.last.is_none()
- }
-
- /// 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`.
- pub fn push(&mut self, value: T)
- where
- P: Default,
- {
- if !self.empty_or_trailing() {
- self.push_punct(Default::default());
- }
- self.push_value(value);
- }
-
- /// Inserts an element at position `index`.
- ///
- /// # Panics
- ///
- /// Panics if `index` is greater than the number of elements previously in
- /// this punctuated sequence.
- pub fn insert(&mut self, index: usize, value: T)
- where
- P: Default,
- {
- assert!(
- index <= self.len(),
- "Punctuated::insert: index out of range",
- );
-
- if index == self.len() {
- self.push(value);
- } else {
- self.inner.insert(index, (value, Default::default()));
- }
- }
-
- /// Clears the sequence of all values and punctuation, making it empty.
- pub fn clear(&mut self) {
- self.inner.clear();
- self.last = None;
- }
-
- /// 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`.
- #[cfg(feature = "parsing")]
- #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
- pub fn parse_terminated(input: ParseStream) -> Result<Self>
- where
- T: Parse,
- P: Parse,
- {
- Self::parse_terminated_with(input, T::parse)
- }
-
- /// 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
- #[cfg(feature = "parsing")]
- #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
- pub fn parse_terminated_with(
- input: ParseStream,
- parser: fn(ParseStream) -> Result<T>,
- ) -> Result<Self>
- where
- P: Parse,
- {
- let mut punctuated = Punctuated::new();
-
- loop {
- if input.is_empty() {
- break;
- }
- let value = parser(input)?;
- punctuated.push_value(value);
- if input.is_empty() {
- break;
- }
- let punct = input.parse()?;
- punctuated.push_punct(punct);
- }
-
- Ok(punctuated)
- }
-
- /// 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.
- #[cfg(feature = "parsing")]
- #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
- pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
- where
- T: Parse,
- P: Token + Parse,
- {
- Self::parse_separated_nonempty_with(input, T::parse)
- }
-
- /// 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
- #[cfg(feature = "parsing")]
- #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
- pub fn parse_separated_nonempty_with(
- input: ParseStream,
- parser: fn(ParseStream) -> Result<T>,
- ) -> Result<Self>
- where
- P: Token + Parse,
- {
- let mut punctuated = Punctuated::new();
-
- loop {
- let value = parser(input)?;
- punctuated.push_value(value);
- if !P::peek(input.cursor()) {
- break;
- }
- let punct = input.parse()?;
- punctuated.push_punct(punct);
- }
-
- Ok(punctuated)
- }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Clone for Punctuated<T, P>
-where
- T: Clone,
- P: Clone,
-{
- fn clone(&self) -> Self {
- Punctuated {
- inner: self.inner.clone(),
- last: self.last.clone(),
- }
- }
-
- fn clone_from(&mut self, other: &Self) {
- self.inner.clone_from(&other.inner);
- self.last.clone_from(&other.last);
- }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> Eq for Punctuated<T, P>
-where
- T: Eq,
- P: Eq,
-{
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> PartialEq for Punctuated<T, P>
-where
- T: PartialEq,
- P: PartialEq,
-{
- fn eq(&self, other: &Self) -> bool {
- let Punctuated { inner, last } = self;
- *inner == other.inner && *last == other.last
- }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> Hash for Punctuated<T, P>
-where
- T: Hash,
- P: Hash,
-{
- fn hash<H: Hasher>(&self, state: &mut H) {
- let Punctuated { inner, last } = self;
- inner.hash(state);
- last.hash(state);
- }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- let mut list = f.debug_list();
- for (t, p) in &self.inner {
- list.entry(t);
- list.entry(p);
- }
- if let Some(last) = &self.last {
- list.entry(last);
- }
- list.finish()
- }
-}
-
-impl<T, P> FromIterator<T> for Punctuated<T, P>
-where
- P: Default,
-{
- fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
- let mut ret = Punctuated::new();
- ret.extend(i);
- ret
- }
-}
-
-impl<T, P> Extend<T> for Punctuated<T, P>
-where
- P: Default,
-{
- fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
- for value in i {
- self.push(value);
- }
- }
-}
-
-impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
- fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
- let mut ret = Punctuated::new();
- do_extend(&mut ret, i.into_iter());
- ret
- }
-}
-
-impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
-where
- P: Default,
-{
- fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
- if !self.empty_or_trailing() {
- self.push_punct(P::default());
- }
- do_extend(self, i.into_iter());
- }
-}
-
-fn do_extend<T, P, I>(punctuated: &mut Punctuated<T, P>, i: I)
-where
- I: Iterator<Item = Pair<T, P>>,
-{
- let mut nomore = false;
- for pair in i {
- if nomore {
- panic!("Punctuated extended with items after a Pair::End");
- }
- match pair {
- Pair::Punctuated(a, b) => punctuated.inner.push((a, b)),
- Pair::End(a) => {
- punctuated.last = Some(Box::new(a));
- nomore = true;
- }
- }
- }
-}
-
-impl<T, P> IntoIterator for Punctuated<T, P> {
- type Item = T;
- type IntoIter = IntoIter<T>;
-
- fn into_iter(self) -> Self::IntoIter {
- let mut elements = Vec::with_capacity(self.len());
- elements.extend(self.inner.into_iter().map(|pair| pair.0));
- elements.extend(self.last.map(|t| *t));
-
- IntoIter {
- inner: elements.into_iter(),
- }
- }
-}
-
-impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
- type Item = &'a T;
- type IntoIter = Iter<'a, T>;
-
- fn into_iter(self) -> Self::IntoIter {
- Punctuated::iter(self)
- }
-}
-
-impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P> {
- type Item = &'a mut T;
- type IntoIter = IterMut<'a, T>;
-
- fn into_iter(self) -> Self::IntoIter {
- Punctuated::iter_mut(self)
- }
-}
-
-impl<T, P> Default for Punctuated<T, P> {
- fn default() -> Self {
- Punctuated::new()
- }
-}
-
-/// An iterator over borrowed pairs of type `Pair<&T, &P>`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct Pairs<'a, T: 'a, P: 'a> {
- inner: slice::Iter<'a, (T, P)>,
- last: option::IntoIter<&'a T>,
-}
-
-impl<'a, T, P> Iterator for Pairs<'a, T, P> {
- type Item = Pair<&'a T, &'a P>;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner
- .next()
- .map(|(t, p)| Pair::Punctuated(t, p))
- .or_else(|| self.last.next().map(Pair::End))
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<'a, T, P> DoubleEndedIterator for Pairs<'a, T, P> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.last
- .next()
- .map(Pair::End)
- .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
- }
-}
-
-impl<'a, T, P> ExactSizeIterator for Pairs<'a, T, P> {
- fn len(&self) -> usize {
- self.inner.len() + self.last.len()
- }
-}
-
-// No Clone bound on T or P.
-impl<'a, T, P> Clone for Pairs<'a, T, P> {
- fn clone(&self) -> Self {
- Pairs {
- inner: self.inner.clone(),
- last: self.last.clone(),
- }
- }
-}
-
-/// 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
-pub struct PairsMut<'a, T: 'a, P: 'a> {
- inner: slice::IterMut<'a, (T, P)>,
- last: option::IntoIter<&'a mut T>,
-}
-
-impl<'a, T, P> Iterator for PairsMut<'a, T, P> {
- type Item = Pair<&'a mut T, &'a mut P>;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner
- .next()
- .map(|(t, p)| Pair::Punctuated(t, p))
- .or_else(|| self.last.next().map(Pair::End))
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PairsMut<'a, T, P> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.last
- .next()
- .map(Pair::End)
- .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
- }
-}
-
-impl<'a, T, P> ExactSizeIterator for PairsMut<'a, T, P> {
- fn len(&self) -> usize {
- self.inner.len() + self.last.len()
- }
-}
-
-/// An iterator over owned pairs of type `Pair<T, P>`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IntoPairs<T, P> {
- inner: vec::IntoIter<(T, P)>,
- last: option::IntoIter<T>,
-}
-
-impl<T, P> Iterator for IntoPairs<T, P> {
- type Item = Pair<T, P>;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner
- .next()
- .map(|(t, p)| Pair::Punctuated(t, p))
- .or_else(|| self.last.next().map(Pair::End))
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<T, P> DoubleEndedIterator for IntoPairs<T, P> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.last
- .next()
- .map(Pair::End)
- .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
- }
-}
-
-impl<T, P> ExactSizeIterator for IntoPairs<T, P> {
- fn len(&self) -> usize {
- self.inner.len() + self.last.len()
- }
-}
-
-impl<T, P> Clone for IntoPairs<T, P>
-where
- T: Clone,
- P: Clone,
-{
- fn clone(&self) -> Self {
- IntoPairs {
- inner: self.inner.clone(),
- last: self.last.clone(),
- }
- }
-}
-
-/// An iterator over owned values of type `T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IntoIter<T> {
- inner: vec::IntoIter<T>,
-}
-
-impl<T> Iterator for IntoIter<T> {
- type Item = T;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner.next()
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<T> DoubleEndedIterator for IntoIter<T> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.inner.next_back()
- }
-}
-
-impl<T> ExactSizeIterator for IntoIter<T> {
- fn len(&self) -> usize {
- self.inner.len()
- }
-}
-
-impl<T> Clone for IntoIter<T>
-where
- T: Clone,
-{
- fn clone(&self) -> Self {
- IntoIter {
- inner: self.inner.clone(),
- }
- }
-}
-
-/// An iterator over borrowed values of type `&T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct Iter<'a, T: 'a> {
- inner: Box<NoDrop<dyn IterTrait<'a, T> + 'a>>,
-}
-
-trait IterTrait<'a, T: 'a>: Iterator<Item = &'a T> + DoubleEndedIterator + ExactSizeIterator {
- fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>>;
-}
-
-struct PrivateIter<'a, T: 'a, P: 'a> {
- inner: slice::Iter<'a, (T, P)>,
- last: option::IntoIter<&'a T>,
-}
-
-impl<'a, T, P> TrivialDrop for PrivateIter<'a, T, P>
-where
- slice::Iter<'a, (T, P)>: TrivialDrop,
- option::IntoIter<&'a T>: TrivialDrop,
-{
-}
-
-#[cfg(any(feature = "full", feature = "derive"))]
-pub(crate) fn empty_punctuated_iter<'a, T>() -> Iter<'a, T> {
- Iter {
- inner: Box::new(NoDrop::new(iter::empty())),
- }
-}
-
-// No Clone bound on T.
-impl<'a, T> Clone for Iter<'a, T> {
- fn clone(&self) -> Self {
- Iter {
- inner: self.inner.clone_box(),
- }
- }
-}
-
-impl<'a, T> Iterator for Iter<'a, T> {
- type Item = &'a T;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner.next()
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.inner.next_back()
- }
-}
-
-impl<'a, T> ExactSizeIterator for Iter<'a, T> {
- fn len(&self) -> usize {
- self.inner.len()
- }
-}
-
-impl<'a, T, P> Iterator for PrivateIter<'a, T, P> {
- type Item = &'a T;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner
- .next()
- .map(|pair| &pair.0)
- .or_else(|| self.last.next())
- }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PrivateIter<'a, T, P> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.last
- .next()
- .or_else(|| self.inner.next_back().map(|pair| &pair.0))
- }
-}
-
-impl<'a, T, P> ExactSizeIterator for PrivateIter<'a, T, P> {
- fn len(&self) -> usize {
- self.inner.len() + self.last.len()
- }
-}
-
-// No Clone bound on T or P.
-impl<'a, T, P> Clone for PrivateIter<'a, T, P> {
- fn clone(&self) -> Self {
- PrivateIter {
- inner: self.inner.clone(),
- last: self.last.clone(),
- }
- }
-}
-
-impl<'a, T, I> IterTrait<'a, T> for I
-where
- T: 'a,
- I: DoubleEndedIterator<Item = &'a T>
- + ExactSizeIterator<Item = &'a T>
- + Clone
- + TrivialDrop
- + 'a,
-{
- fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>> {
- Box::new(NoDrop::new(self.clone()))
- }
-}
-
-/// An iterator over mutably borrowed values of type `&mut T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IterMut<'a, T: 'a> {
- inner: Box<NoDrop<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>>,
-}
-
-trait IterMutTrait<'a, T: 'a>:
- DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T>
-{
-}
-
-struct PrivateIterMut<'a, T: 'a, P: 'a> {
- inner: slice::IterMut<'a, (T, P)>,
- last: option::IntoIter<&'a mut T>,
-}
-
-impl<'a, T, P> TrivialDrop for PrivateIterMut<'a, T, P>
-where
- slice::IterMut<'a, (T, P)>: TrivialDrop,
- option::IntoIter<&'a mut T>: TrivialDrop,
-{
-}
-
-#[cfg(any(feature = "full", feature = "derive"))]
-pub(crate) fn empty_punctuated_iter_mut<'a, T>() -> IterMut<'a, T> {
- IterMut {
- inner: Box::new(NoDrop::new(iter::empty())),
- }
-}
-
-impl<'a, T> Iterator for IterMut<'a, T> {
- type Item = &'a mut T;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner.next()
- }
-
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.len(), Some(self.len()))
- }
-}
-
-impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.inner.next_back()
- }
-}
-
-impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
- fn len(&self) -> usize {
- self.inner.len()
- }
-}
-
-impl<'a, T, P> Iterator for PrivateIterMut<'a, T, P> {
- type Item = &'a mut T;
-
- fn next(&mut self) -> Option<Self::Item> {
- self.inner
- .next()
- .map(|pair| &mut pair.0)
- .or_else(|| self.last.next())
- }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PrivateIterMut<'a, T, P> {
- fn next_back(&mut self) -> Option<Self::Item> {
- self.last
- .next()
- .or_else(|| self.inner.next_back().map(|pair| &mut pair.0))
- }
-}
-
-impl<'a, T, P> ExactSizeIterator for PrivateIterMut<'a, T, P> {
- fn len(&self) -> usize {
- self.inner.len() + self.last.len()
- }
-}
-
-impl<'a, T, I> IterMutTrait<'a, T> for I
-where
- T: 'a,
- I: DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T> + 'a,
-{
-}
-
-/// 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
-pub enum Pair<T, P> {
- Punctuated(T, P),
- End(T),
-}
-
-impl<T, P> Pair<T, P> {
- /// Extracts the syntax tree node from this punctuated pair, discarding the
- /// following punctuation.
- pub fn into_value(self) -> T {
- match self {
- Pair::Punctuated(t, _) | Pair::End(t) => t,
- }
- }
-
- /// Borrows the syntax tree node from this punctuated pair.
- pub fn value(&self) -> &T {
- match self {
- Pair::Punctuated(t, _) | Pair::End(t) => t,
- }
- }
-
- /// Mutably borrows the syntax tree node from this punctuated pair.
- pub fn value_mut(&mut self) -> &mut T {
- match self {
- Pair::Punctuated(t, _) | Pair::End(t) => t,
- }
- }
-
- /// Borrows the punctuation from this punctuated pair, unless this pair is
- /// the final one and there is no trailing punctuation.
- pub fn punct(&self) -> Option<&P> {
- match self {
- Pair::Punctuated(_, p) => Some(p),
- Pair::End(_) => None,
- }
- }
-
- /// 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;
- /// }
- /// ```
- pub fn punct_mut(&mut self) -> Option<&mut P> {
- match self {
- Pair::Punctuated(_, p) => Some(p),
- Pair::End(_) => None,
- }
- }
-
- /// Creates a punctuated pair out of a syntax tree node and an optional
- /// following punctuation.
- pub fn new(t: T, p: Option<P>) -> Self {
- match p {
- Some(p) => Pair::Punctuated(t, p),
- None => Pair::End(t),
- }
- }
-
- /// Produces this punctuated pair as a tuple of syntax tree node and
- /// optional following punctuation.
- pub fn into_tuple(self) -> (T, Option<P>) {
- match self {
- Pair::Punctuated(t, p) => (t, Some(p)),
- Pair::End(t) => (t, None),
- }
- }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Pair<&T, &P> {
- pub fn cloned(self) -> Pair<T, P>
- where
- T: Clone,
- P: Clone,
- {
- match self {
- Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()),
- Pair::End(t) => Pair::End(t.clone()),
- }
- }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Clone for Pair<T, P>
-where
- T: Clone,
- P: Clone,
-{
- fn clone(&self) -> Self {
- match self {
- Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()),
- Pair::End(t) => Pair::End(t.clone()),
- }
- }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Copy for Pair<T, P>
-where
- T: Copy,
- P: Copy,
-{
-}
-
-impl<T, P> Index<usize> for Punctuated<T, P> {
- type Output = T;
-
- fn index(&self, index: usize) -> &Self::Output {
- if index == self.len() - 1 {
- match &self.last {
- Some(t) => t,
- None => &self.inner[index].0,
- }
- } else {
- &self.inner[index].0
- }
- }
-}
-
-impl<T, P> IndexMut<usize> for Punctuated<T, P> {
- fn index_mut(&mut self, index: usize) -> &mut Self::Output {
- if index == self.len() - 1 {
- match &mut self.last {
- Some(t) => t,
- None => &mut self.inner[index].0,
- }
- } else {
- &mut self.inner[index].0
- }
- }
-}
-
-#[cfg(feature = "printing")]
-mod printing {
- use super::*;
- use proc_macro2::TokenStream;
- use quote::{ToTokens, TokenStreamExt};
-
- #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
- impl<T, P> ToTokens for Punctuated<T, P>
- where
- T: ToTokens,
- P: ToTokens,
- {
- fn to_tokens(&self, tokens: &mut TokenStream) {
- tokens.append_all(self.pairs());
- }
- }
-
- #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
- impl<T, P> ToTokens for Pair<T, P>
- where
- T: ToTokens,
- P: ToTokens,
- {
- fn to_tokens(&self, tokens: &mut TokenStream) {
- match self {
- Pair::Punctuated(a, b) => {
- a.to_tokens(tokens);
- b.to_tokens(tokens);
- }
- Pair::End(a) => a.to_tokens(tokens),
- }
- }
- }
-}
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