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108 lines
2.8 KiB
Rust
108 lines
2.8 KiB
Rust
/// Used to get an object that knows how to format this object.
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pub trait AsFormat<Context> {
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type Format<'a>: ruff_formatter::Format<Context>
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where
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Self: 'a;
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/// Returns an object that is able to format this object.
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fn format(&self) -> Self::Format<'_>;
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}
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/// Implement [`AsFormat`] for references to types that implement [`AsFormat`].
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impl<T, C> AsFormat<C> for &T
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where
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T: AsFormat<C>,
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{
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type Format<'a> = T::Format<'a> where Self: 'a;
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fn format(&self) -> Self::Format<'_> {
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AsFormat::format(&**self)
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}
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}
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/// Used to convert this object into an object that can be formatted.
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///
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/// The difference to [`AsFormat`] is that this trait takes ownership of `self`.
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pub trait IntoFormat<Context> {
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type Format: ruff_formatter::Format<Context>;
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fn into_format(self) -> Self::Format;
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}
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/// Implement [`IntoFormat`] for [`Option`] when `T` implements [`IntoFormat`]
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///
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/// Allows to call format on optional AST fields without having to unwrap the
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/// field first.
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impl<T, Context> IntoFormat<Context> for Option<T>
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where
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T: IntoFormat<Context>,
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{
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type Format = Option<T::Format>;
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fn into_format(self) -> Self::Format {
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self.map(IntoFormat::into_format)
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}
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}
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/// Implement [`IntoFormat`] for references to types that implement [`AsFormat`].
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impl<'a, T, C> IntoFormat<C> for &'a T
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where
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T: AsFormat<C>,
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{
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type Format = T::Format<'a>;
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fn into_format(self) -> Self::Format {
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AsFormat::format(self)
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}
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}
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/// Formatting specific [`Iterator`] extensions
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pub trait FormattedIterExt {
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/// Converts every item to an object that knows how to format it.
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fn formatted<Context>(self) -> FormattedIter<Self, Self::Item, Context>
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where
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Self: Iterator + Sized,
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Self::Item: IntoFormat<Context>,
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{
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FormattedIter {
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inner: self,
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options: std::marker::PhantomData,
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}
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}
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}
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impl<I> FormattedIterExt for I where I: std::iter::Iterator {}
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pub struct FormattedIter<Iter, Item, Context>
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where
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Iter: Iterator<Item = Item>,
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{
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inner: Iter,
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options: std::marker::PhantomData<Context>,
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}
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impl<Iter, Item, Context> std::iter::Iterator for FormattedIter<Iter, Item, Context>
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where
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Iter: Iterator<Item = Item>,
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Item: IntoFormat<Context>,
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{
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type Item = Item::Format;
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fn next(&mut self) -> Option<Self::Item> {
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Some(self.inner.next()?.into_format())
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}
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}
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impl<Iter, Item, Context> std::iter::FusedIterator for FormattedIter<Iter, Item, Context>
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where
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Iter: std::iter::FusedIterator<Item = Item>,
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Item: IntoFormat<Context>,
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{
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}
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impl<Iter, Item, Context> std::iter::ExactSizeIterator for FormattedIter<Iter, Item, Context>
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where
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Iter: Iterator<Item = Item> + std::iter::ExactSizeIterator,
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Item: IntoFormat<Context>,
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{
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}
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