proc_macro2

Enum TokenTree

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pub enum TokenTree {
    Group(Group),
    Ident(Ident),
    Punct(Punct),
    Literal(Literal),
}
Expand description

A single token or a delimited sequence of token trees (e.g. [1, (), ..]).

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Group(Group)

A token stream surrounded by bracket delimiters.

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Ident(Ident)

An identifier.

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Punct(Punct)

A single punctuation character (+, ,, $, etc.).

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Literal(Literal)

A literal character ('a'), string ("hello"), number (2.3), etc.

Implementations§

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impl TokenTree

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pub fn span(&self) -> Span

Returns the span of this tree, delegating to the span method of the contained token or a delimited stream.

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pub fn set_span(&mut self, span: Span)

Configures the span for only this token.

Note that if this token is a Group then this method will not configure the span of each of the internal tokens, this will simply delegate to the set_span method of each variant.

Trait Implementations§

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impl Clone for TokenTree

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fn clone(&self) -> TokenTree

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

Performs copy-assignment from source. Read more
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impl Debug for TokenTree

Prints token tree in a form convenient for debugging.

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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 Display for TokenTree

Prints the token tree as a string that is supposed to be losslessly convertible back into the same token tree (modulo spans), except for possibly TokenTree::Groups with Delimiter::None delimiters and negative numeric literals.

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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 Extend<TokenTree> for TokenStream

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fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, streams: 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 From<Group> for TokenTree

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fn from(g: Group) -> Self

Converts to this type from the input type.
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impl From<Ident> for TokenTree

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fn from(g: Ident) -> Self

Converts to this type from the input type.
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impl From<Literal> for TokenTree

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fn from(g: Literal) -> Self

Converts to this type from the input type.
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impl From<Punct> for TokenTree

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fn from(g: Punct) -> Self

Converts to this type from the input type.
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impl From<TokenTree> for TokenStream

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fn from(token: TokenTree) -> Self

Converts to this type from the input type.
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impl FromIterator<TokenTree> for TokenStream

Collects a number of token trees into a single stream.

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fn from_iter<I: IntoIterator<Item = TokenTree>>(streams: I) -> Self

Creates a value from an iterator. Read more

Auto Trait Implementations§

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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> 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. 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.