Struct syn::punctuated::Punctuated

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pub struct Punctuated<T, P> { /* private fields */ }
Expand description

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.

Implementations§

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impl<T, P> Punctuated<T, P>

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pub const fn new() -> Self

Creates an empty punctuated sequence.

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pub fn is_empty(&self) -> bool

Determines whether this punctuated sequence is empty, meaning it contains no syntax tree nodes or punctuation.

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pub fn len(&self) -> usize

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.

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pub fn first(&self) -> Option<&T>

Borrows the first element in this sequence.

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pub fn first_mut(&mut self) -> Option<&mut T>

Mutably borrows the first element in this sequence.

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pub fn last(&self) -> Option<&T>

Borrows the last element in this sequence.

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pub fn last_mut(&mut self) -> Option<&mut T>

Mutably borrows the last element in this sequence.

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pub fn get(&self, index: usize) -> Option<&T>

Borrows the element at the given index.

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pub fn get_mut(&mut self, index: usize) -> Option<&mut T>

Mutably borrows the element at the given index.

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pub fn iter(&self) -> Iter<'_, T>

Returns an iterator over borrowed syntax tree nodes of type &T.

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pub fn iter_mut(&mut self) -> IterMut<'_, T>

Returns an iterator over mutably borrowed syntax tree nodes of type &mut T.

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pub fn pairs(&self) -> Pairs<'_, T, P>

Returns an iterator over the contents of this sequence as borrowed punctuated pairs.

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pub fn pairs_mut(&mut self) -> PairsMut<'_, T, P>

Returns an iterator over the contents of this sequence as mutably borrowed punctuated pairs.

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pub fn into_pairs(self) -> IntoPairs<T, P>

Returns an iterator over the contents of this sequence as owned punctuated pairs.

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pub fn push_value(&mut self, value: T)

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.

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Panics if the sequence is nonempty and does not already have a trailing punctuation.

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pub fn push_punct(&mut self, punctuation: P)

Appends a trailing punctuation onto the end of this punctuated sequence. The sequence must be non-empty and must not already have trailing punctuation.

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Panics if the sequence is empty or already has a trailing punctuation.

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pub fn pop(&mut self) -> Option<Pair<T, P>>

Removes the last punctuated pair from this sequence, or None if the sequence is empty.

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pub fn pop_punct(&mut self) -> Option<P>

Removes the trailing punctuation from this punctuated sequence, or None if there isn’t any.

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pub fn trailing_punct(&self) -> bool

Determines whether this punctuated sequence ends with a trailing punctuation.

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pub fn empty_or_trailing(&self) -> bool

Returns true if either this Punctuated is empty, or it has a trailing punctuation.

Equivalent to punctuated.is_empty() || punctuated.trailing_punct().

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pub fn push(&mut self, value: T)
where P: Default,

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.

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pub fn insert(&mut self, index: usize, value: T)
where P: Default,

Inserts an element at position index.

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Panics if index is greater than the number of elements previously in this punctuated sequence.

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pub fn clear(&mut self)

Clears the sequence of all values and punctuation, making it empty.

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pub fn parse_terminated(input: ParseStream<'_>) -> Result<Self>
where T: Parse, P: Parse,

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.

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pub fn parse_terminated_with( input: ParseStream<'_>, parser: fn(_: ParseStream<'_>) -> Result<T>, ) -> Result<Self>
where P: 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.

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pub fn parse_separated_nonempty(input: ParseStream<'_>) -> Result<Self>
where T: Parse, P: Token + Parse,

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.

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pub fn parse_separated_nonempty_with( input: ParseStream<'_>, parser: fn(_: ParseStream<'_>) -> Result<T>, ) -> Result<Self>
where P: Token + 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.

Trait Implementations§

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impl<T, P> Clone for Punctuated<T, P>
where T: Clone, P: Clone,

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, other: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug, P: Debug> Debug for Punctuated<T, P>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T, P> Default for Punctuated<T, P>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
where P: Default,

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fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I)

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<T, P> Extend<T> for Punctuated<T, P>
where P: Default,

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fn extend<I: IntoIterator<Item = T>>(&mut self, i: I)

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P>

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fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self

Creates a value from an iterator. Read more
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impl<T, P> FromIterator<T> for Punctuated<T, P>
where P: Default,

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fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self

Creates a value from an iterator. Read more
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impl<T, P> Hash for Punctuated<T, P>
where T: Hash, P: Hash,

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fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T, P> Index<usize> for Punctuated<T, P>

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type Output = T

The returned type after indexing.
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fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation. Read more
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impl<T, P> IndexMut<usize> for Punctuated<T, P>

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fn index_mut(&mut self, index: usize) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<'a, T, P> IntoIterator for &'a Punctuated<T, P>

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type Item = &'a T

The type of the elements being iterated over.
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type IntoIter = Iter<'a, T>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P>

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type Item = &'a mut T

The type of the elements being iterated over.
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type IntoIter = IterMut<'a, T>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<T, P> IntoIterator for Punctuated<T, P>

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type Item = T

The type of the elements being iterated over.
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type IntoIter = IntoIter<T>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<T, P> PartialEq for Punctuated<T, P>
where T: PartialEq, P: PartialEq,

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fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T, P> ToTokens for Punctuated<T, P>
where T: ToTokens, P: ToTokens,

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fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream. Read more
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fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more
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fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert self directly into a TokenStream object. Read more
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impl<T, P> Eq for Punctuated<T, P>
where T: Eq, P: Eq,

Auto Trait Implementations§

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impl<T, P> Freeze for Punctuated<T, P>

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impl<T, P> RefUnwindSafe for Punctuated<T, P>

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impl<T, P> Send for Punctuated<T, P>
where T: Send, P: Send,

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impl<T, P> Sync for Punctuated<T, P>
where T: Sync, P: Sync,

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impl<T, P> Unpin for Punctuated<T, P>
where T: Unpin, P: Unpin,

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impl<T, P> UnwindSafe for Punctuated<T, P>
where T: UnwindSafe, P: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Spanned for T
where T: Spanned + ?Sized,

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fn span(&self) -> Span

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.