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//! This is an internal module used by the ifmt! runtime. These structures are
//! emitted to static arrays to precompile format strings ahead of time.
//!
//! These definitions are similar to their `ct` equivalents, but differ in that
//! these can be statically allocated and are slightly optimized for the runtime
#![allow(missing_debug_implementations)]
#[cfg_attr(not(bootstrap), lang = "format_placeholder")]
#[derive(Copy, Clone)]
// FIXME: Rename this to Placeholder
pub struct Argument {
pub position: usize,
pub format: FormatSpec,
}
#[derive(Copy, Clone)]
pub struct FormatSpec {
pub fill: char,
pub align: Alignment,
pub flags: u32,
pub precision: Count,
pub width: Count,
}
impl Argument {
#[inline(always)]
pub const fn new(
position: usize,
fill: char,
align: Alignment,
flags: u32,
precision: Count,
width: Count,
) -> Self {
Self { position, format: FormatSpec { fill, align, flags, precision, width } }
}
}
/// Possible alignments that can be requested as part of a formatting directive.
#[cfg_attr(not(bootstrap), lang = "format_alignment")]
#[derive(Copy, Clone, PartialEq, Eq)]
pub enum Alignment {
/// Indication that contents should be left-aligned.
Left,
/// Indication that contents should be right-aligned.
Right,
/// Indication that contents should be center-aligned.
Center,
/// No alignment was requested.
Unknown,
}
/// Used by [width](https://doc.rust-lang.org/std/fmt/#width) and [precision](https://doc.rust-lang.org/std/fmt/#precision) specifiers.
#[cfg_attr(not(bootstrap), lang = "format_count")]
#[derive(Copy, Clone)]
pub enum Count {
/// Specified with a literal number, stores the value
Is(usize),
/// Specified using `$` and `*` syntaxes, stores the index into `args`
Param(usize),
/// Not specified
Implied,
}
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