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nora 2022-09-14 22:49:10 +02:00
parent 594047c0a1
commit 443d5385df
3 changed files with 40 additions and 6 deletions
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35
src/opts.rs
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@ -20,12 +20,24 @@ macro_rules! options {
}
)*
) => {
pub trait FmtOpts {
// FIXME: We can get rid of this Copy can't we
pub trait FmtOpts: Copy {
#[doc(hidden)]
type Inner: FmtOpts;
/// Replaces the innermost `()` with `I`
type ReplaceInnermost<I: FmtOpts>: FmtOpts;
fn inner(&self) -> &Self::Inner;
/// # Example
/// `Self` is `WithAlternate<WithFill<(), ' '>>`
/// `Other` is WithMinus<()>
///
/// This returns `WithAlternate<WithFille<WithMinus<()>, ' '>>`
///
fn override_other<Other: FmtOpts>(self, other: Other) -> Self::ReplaceInnermost<Other>;
$(
#[inline]
fn $name(&self) -> $ret {
@ -37,10 +49,16 @@ macro_rules! options {
impl FmtOpts for () {
type Inner = Self;
type ReplaceInnermost<I: FmtOpts> = I;
fn inner(&self) -> &Self::Inner {
self
}
fn override_other<Other: FmtOpts>(self, other: Other) -> Self::ReplaceInnermost::<Other> {
other
}
$(
#[inline]
fn $name(&self) -> $ret {
@ -52,10 +70,16 @@ macro_rules! options {
impl<O: FmtOpts> FmtOpts for &'_ O {
type Inner = O::Inner;
fn inner(&self) -> &Self::Inner {
type ReplaceInnermost<I: FmtOpts> = O::ReplaceInnermost<I>;
fn inner(&self) -> &Self::Inner {
O::inner(self)
}
fn override_other<Other: FmtOpts>(self, other: Other) -> Self::ReplaceInnermost<Other> {
O::override_other(*self, other)
}
$(
#[inline]
fn $name(&self) -> $ret {
@ -75,15 +99,22 @@ macro_rules! options {
}
$(
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct $with_name<I, $($(const $const_gen_name: $with_ty),*)?>(#[doc(hidden)] pub I);
impl<I: FmtOpts, $($(const $const_gen_name: $with_ty),*)?> FmtOpts for $with_name<I, $($($const_gen_name),*)?> {
type Inner = I;
type ReplaceInnermost<Replacement: FmtOpts> = $with_name<I::ReplaceInnermost<Replacement>, $($($const_gen_name),*)?>;
fn inner(&self) -> &Self::Inner {
&self.0
}
fn override_other<Other: FmtOpts>(self, other: Other) -> Self::ReplaceInnermost<Other> {
$with_name(self.0.override_other(other))
}
fn $name(&self) -> $ret {
$($struct_body)*
}