rust/quote/format.rs

Source file repositories/reference/linux-study-clean/rust/quote/format.rs

File Facts

System
Linux kernel
Corpus path
rust/quote/format.rs
Extension
.rs
Size
4842 bytes
Lines
171
Domain
Rust Kernel Layer
Bucket
Rust API Membrane
Inferred role
Rust Kernel Layer: implementation source
Status
source implementation candidate

Why This File Exists

Rust-side wrappers and abstractions around kernel C APIs, ownership contracts, allocation, synchronization, and module integration.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: Apache-2.0 OR MIT

/// Formatting macro for constructing `Ident`s.
///
/// <br>
///
/// # Syntax
///
/// Syntax is copied from the [`format!`] macro, supporting both positional and
/// named arguments.
///
/// Only a limited set of formatting traits are supported. The current mapping
/// of format types to traits is:
///
/// * `{}` ⇒ [`IdentFragment`]
/// * `{:o}` ⇒ [`Octal`](std::fmt::Octal)
/// * `{:x}` ⇒ [`LowerHex`](std::fmt::LowerHex)
/// * `{:X}` ⇒ [`UpperHex`](std::fmt::UpperHex)
/// * `{:b}` ⇒ [`Binary`](std::fmt::Binary)
///
/// See [`std::fmt`] for more information.
///
/// <br>
///
/// # IdentFragment
///
/// Unlike `format!`, this macro uses the [`IdentFragment`] formatting trait by
/// default. This trait is like `Display`, with a few differences:
///
/// * `IdentFragment` is only implemented for a limited set of types, such as
///   unsigned integers and strings.
/// * [`Ident`] arguments will have their `r#` prefixes stripped, if present.
///
/// [`IdentFragment`]: crate::IdentFragment
/// [`Ident`]: proc_macro2::Ident
///
/// <br>
///
/// # Hygiene
///
/// The [`Span`] of the first `Ident` argument is used as the span of the final
/// identifier, falling back to [`Span::call_site`] when no identifiers are
/// provided.
///
/// ```
/// # use quote::format_ident;
/// # let ident = format_ident!("Ident");
/// // If `ident` is an Ident, the span of `my_ident` will be inherited from it.
/// let my_ident = format_ident!("My{}{}", ident, "IsCool");
/// assert_eq!(my_ident, "MyIdentIsCool");
/// ```
///
/// Alternatively, the span can be overridden by passing the `span` named
/// argument.
///
/// ```
/// # use quote::format_ident;
/// # const IGNORE_TOKENS: &'static str = stringify! {
/// let my_span = /* ... */;
/// # };
/// # let my_span = proc_macro2::Span::call_site();
/// format_ident!("MyIdent", span = my_span);
/// ```
///
/// [`Span`]: proc_macro2::Span
/// [`Span::call_site`]: proc_macro2::Span::call_site
///
/// <p><br></p>
///
/// # Panics
///
/// This method will panic if the resulting formatted string is not a valid
/// identifier.
///
/// <br>
///
/// # Examples
///
/// Composing raw and non-raw identifiers:
/// ```
/// # use quote::format_ident;
/// let my_ident = format_ident!("My{}", "Ident");
/// assert_eq!(my_ident, "MyIdent");
///
/// let raw = format_ident!("r#Raw");
/// assert_eq!(raw, "r#Raw");
///
/// let my_ident_raw = format_ident!("{}Is{}", my_ident, raw);
/// assert_eq!(my_ident_raw, "MyIdentIsRaw");
/// ```

Annotation

Implementation Notes