IdentPrinter

rustc_span::symbol

Struct IdentPrinter 

Source 
pub struct IdentPrinter {
    symbol: Symbol,
    mode: IdentPrintMode,
    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§mode: IdentPrintMode§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, mode: IdentPrintMode, 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, mode: IdentPrintMode) -> 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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impl<T> Aligned for T

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const ALIGN: Alignment

Alignment of Self.
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fn from(t: T) -> T

Returns the argument unchanged.

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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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const ALIGN: usize

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The type for initializers.
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type Output = T

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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