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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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16
crates/base-db/src/span.rs
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@ -1,6 +1,7 @@
use std::fmt;
use salsa::InternId;
use tt::SyntaxContext;
use vfs::FileId;
pub type ErasedFileAstId = la_arena::Idx<syntax::SyntaxNodePtr>;
@ -9,10 +10,17 @@ pub type ErasedFileAstId = la_arena::Idx<syntax::SyntaxNodePtr>;
pub const ROOT_ERASED_FILE_AST_ID: ErasedFileAstId =
la_arena::Idx::from_raw(la_arena::RawIdx::from_u32(0));
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct SyntaxContext;
pub type SpanData = tt::SpanData<SpanAnchor, SyntaxContextId>;
pub type SpanData = tt::SpanData<SpanAnchor>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct SyntaxContextId(InternId);
crate::impl_intern_key!(SyntaxContextId);
impl SyntaxContext for SyntaxContextId {
// FIXME: This is very much UB, salsa exposes no way to create an InternId in a const context
// currently (which kind of makes sense but we need it here!)
const DUMMY: Self = SyntaxContextId(unsafe { core::mem::transmute(1) });
}
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct SpanAnchor {
@ -26,7 +34,7 @@ impl fmt::Debug for SpanAnchor {
}
}
impl tt::Span for SpanAnchor {
impl tt::SpanAnchor for SpanAnchor {
const DUMMY: Self = SpanAnchor { file_id: HirFileId(0), ast_id: ROOT_ERASED_FILE_AST_ID };
}