52 lines
1.5 KiB
Rust
52 lines
1.5 KiB
Rust
//! Context for lowering paths.
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use std::cell::OnceCell;
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use hir_expand::{
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ast_id_map::{AstIdMap, AstIdNode},
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span::{SpanMap, SpanMapRef},
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AstId, HirFileId, InFile,
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};
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use syntax::ast;
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use triomphe::Arc;
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use crate::{db::DefDatabase, path::Path};
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pub struct LowerCtx<'a> {
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pub db: &'a dyn DefDatabase,
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span_map: SpanMap,
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// FIXME: This optimization is probably pointless, ast id map should pretty much always exist anyways.
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ast_id_map: Option<(HirFileId, OnceCell<Arc<AstIdMap>>)>,
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}
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impl<'a> LowerCtx<'a> {
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pub fn new(db: &'a dyn DefDatabase, span_map: SpanMap, file_id: HirFileId) -> Self {
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LowerCtx { db, span_map, ast_id_map: Some((file_id, OnceCell::new())) }
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}
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pub fn with_file_id(db: &'a dyn DefDatabase, file_id: HirFileId) -> Self {
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LowerCtx {
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db,
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span_map: db.span_map(file_id),
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ast_id_map: Some((file_id, OnceCell::new())),
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}
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}
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pub fn with_span_map(db: &'a dyn DefDatabase, span_map: SpanMap) -> Self {
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LowerCtx { db, span_map, ast_id_map: None }
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}
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pub(crate) fn span_map(&self) -> SpanMapRef<'_> {
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self.span_map.as_ref()
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}
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pub(crate) fn lower_path(&self, ast: ast::Path) -> Option<Path> {
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Path::from_src(self, ast)
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}
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pub(crate) fn ast_id<N: AstIdNode>(&self, item: &N) -> Option<AstId<N>> {
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let &(file_id, ref ast_id_map) = self.ast_id_map.as_ref()?;
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let ast_id_map = ast_id_map.get_or_init(|| self.db.ast_id_map(file_id));
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Some(InFile::new(file_id, ast_id_map.ast_id(item)))
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}
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}
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