pub struct IdentPrinter {
    symbol: Symbol,
    is_raw: bool,
    convert_dollar_crate: Option<Span>,
}
Expand description

The most general type to print identifiers.

AST pretty-printer is used as a fallback for turning AST structures into token streams for proc macros. Additionally, proc macros may stringify their input and expect it survive the stringification (especially true for proc macro derives written between Rust 1.15 and 1.30). So we need to somehow pretty-print $crate in a way preserving at least some of its hygiene data, most importantly name of the crate it refers to. As a result we print $crate as crate if it refers to the local crate and as ::other_crate_name if it refers to some other crate. Note, that this is only done if the ident token is printed from inside of AST pretty-printing, but not otherwise. Pretty-printing is the only way for proc macros to discover token contents, so we should not perform this lossy conversion if the top level call to the pretty-printer was done for a token stream or a single token.

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§symbol: Symbol§is_raw: bool§convert_dollar_crate: Option<Span>

Span used for retrieving the crate name to which $crate refers to, if this field is None then the $crate conversion doesn’t happen.

Implementations§

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impl IdentPrinter

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pub fn new( symbol: Symbol, is_raw: bool, convert_dollar_crate: Option<Span> ) -> IdentPrinter

The most general IdentPrinter constructor. Do not use this.

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pub fn for_ast_ident(ident: Ident, is_raw: bool) -> IdentPrinter

This implementation is supposed to be used when printing identifiers as a part of pretty-printing for larger AST pieces. Do not use this either.

Trait Implementations§

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impl Display for IdentPrinter

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

Formats the value using the given formatter. Read more

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Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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: 20 bytes