pub struct AttrWrapper {
    attrs: AttrVec,
    start_pos: usize,
}
Expand description

A wrapper type to ensure that the parser handles outer attributes correctly. When we parse outer attributes, we need to ensure that we capture tokens for the attribute target. This allows us to perform cfg-expansion on a token stream before we invoke a derive proc-macro.

This wrapper prevents direct access to the underlying ast::AttrVec>. Parsing code can only get access to the underlying attributes by passing an AttrWrapper to collect_tokens_trailing_tokens. This makes it difficult to accidentally construct an AST node (which stores an ast::AttrVec) without first collecting tokens.

This struct has its own module, to ensure that the parser code cannot directly access the attrs field

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§attrs: AttrVec§start_pos: usize

Implementations§

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impl AttrWrapper

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pub(super) fn new(attrs: AttrVec, start_pos: usize) -> AttrWrapper

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pub fn empty() -> AttrWrapper

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pub(crate) fn take_for_recovery(self, sess: &ParseSess) -> AttrVec

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pub(crate) fn prepend_to_nt_inner(self, attrs: &mut AttrVec)

Prepend self.attrs to attrs.

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pub fn is_empty(&self) -> bool

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pub fn is_complete(&self) -> bool

Trait Implementations§

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impl Clone for AttrWrapper

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fn clone(&self) -> AttrWrapper

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 AttrWrapper

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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> 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> 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.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes