Struct proc_macro::Group

1.29.0 · source ·
pub struct Group(_);
Expand description

A delimited token stream.

A Group internally contains a TokenStream which is surrounded by Delimiters.

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impl Group

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pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group

Creates a new Group with the given delimiter and token stream.

This constructor will set the span for this group to Span::call_site(). To change the span you can use the set_span method below.

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pub fn delimiter(&self) -> Delimiter

Returns the delimiter of this Group

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pub fn stream(&self) -> TokenStream

Returns the TokenStream of tokens that are delimited in this Group.

Note that the returned token stream does not include the delimiter returned above.

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pub fn span(&self) -> Span

Returns the span for the delimiters of this token stream, spanning the entire Group.

pub fn span(&self) -> Span {
           ^^^^^^^
1.55.0 · source

pub fn span_open(&self) -> Span

Returns the span pointing to the opening delimiter of this group.

pub fn span_open(&self) -> Span {
                ^
1.55.0 · source

pub fn span_close(&self) -> Span

Returns the span pointing to the closing delimiter of this group.

pub fn span_close(&self) -> Span {
                       ^
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pub fn set_span(&mut self, span: Span)

Configures the span for this Group’s delimiters, but not its internal tokens.

This method will not set the span of all the internal tokens spanned by this group, but rather it will only set the span of the delimiter tokens at the level of the Group.

Trait Implementations§

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impl Clone for Group

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fn clone(&self) -> Group

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

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

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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 Group

Prints the group as a string that should be losslessly convertible back into the same group (modulo spans), except for possibly TokenTree::Groups with Delimiter::None delimiters.

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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 From<Group> for TokenTree

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fn from(g: Group) -> TokenTree

Converts to this type from the input type.
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impl ToString for Group

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fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl !Send for Group

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impl !Sync for Group

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere
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 Twhere
T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source§

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 Twhere
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 Twhere
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 Twhere
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere
U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.