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Proper span representation with syntax context

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This commit is contained in:
Lukas Wirth 2023-10-06 14:47:11 +02:00
parent 890eb17b4e
commit e36b3f7b8c
16 changed files with 414 additions and 470 deletions
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28
crates/tt/src/lib.rs
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@ -32,27 +32,37 @@ impl TokenId {
Self::UNSPECIFIED
}
}
impl Span for TokenId {
const DUMMY: Self = TokenId(!0);
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct SpanData<Anchor> {
pub struct SpanData<Anchor, Ctx> {
/// The text range of this span, relative to the anchor.
/// We need the anchor for incrementality, as storing absolute ranges will require
/// recomputation on every change in a file at all times.
pub range: TextRange,
pub anchor: Anchor,
/// The syntax context of the span.
pub ctx: Ctx,
}
impl<Anchor: Span> Span for SpanData<Anchor> {
const DUMMY: Self =
SpanData { range: TextRange::empty(TextSize::new(0)), anchor: Anchor::DUMMY };
impl<Anchor: SpanAnchor, Ctx: SyntaxContext> Span for SpanData<Anchor, Ctx> {
const DUMMY: Self = SpanData {
range: TextRange::empty(TextSize::new(0)),
anchor: Anchor::DUMMY,
ctx: Ctx::DUMMY,
};
}
pub trait SpanAnchor: std::fmt::Debug + Copy + Sized + Eq {
const DUMMY: Self;
}
pub trait Span: std::fmt::Debug + Copy + Sized + Eq {
const DUMMY: Self;
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct SyntaxContext(pub u32);
pub trait SyntaxContext: std::fmt::Debug + Copy + Sized + Eq {
const DUMMY: Self;
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TokenTree<S> {