49 lines
1.3 KiB
Rust
49 lines
1.3 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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span_map::{SpanMap, SpanMapRef},
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AstId, HirFileId, InFile,
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};
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use span::{AstIdMap, AstIdNode};
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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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file_id: HirFileId,
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span_map: OnceCell<SpanMap>,
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ast_id_map: 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, file_id: HirFileId) -> Self {
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LowerCtx { db, file_id, span_map: OnceCell::new(), ast_id_map: OnceCell::new() }
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}
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pub fn with_span_map_cell(
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db: &'a dyn DefDatabase,
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file_id: HirFileId,
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span_map: OnceCell<SpanMap>,
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) -> Self {
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LowerCtx { db, file_id, span_map, ast_id_map: OnceCell::new() }
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}
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pub(crate) fn span_map(&self) -> SpanMapRef<'_> {
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self.span_map.get_or_init(|| self.db.span_map(self.file_id)).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) -> AstId<N> {
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InFile::new(
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self.file_id,
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self.ast_id_map.get_or_init(|| self.db.ast_id_map(self.file_id)).ast_id(item),
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)
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}
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}
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