move expansion-related code to a separate crate

1 files changed, 3 insertions, 70 deletions

diff --git a/crates/ra_hir/src/source_id.rs b/crates/ra_hir/src/source_id.rs
index 260b79661..c70245949 100644
--- a/crates/ra_hir/src/source_id.rs
+++ b/crates/ra_hir/src/source_id.rs
@@ -1,73 +1,6 @@
 //! FIXME: write short doc here
 
-use std::{
-    hash::{Hash, Hasher},
-    sync::Arc,
+pub use hir_def::{
+    ast_id_map::{AstIdMap, ErasedFileAstId, FileAstId},
+    expand::AstId,
 };
-
-pub use hir_def::ast_id_map::{AstIdMap, ErasedFileAstId, FileAstId};
-use ra_syntax::{AstNode, SyntaxNode};
-
-use crate::{db::AstDatabase, HirFileId};
-
-/// `AstId` points to an AST node in any file.
-///
-/// It is stable across reparses, and can be used as salsa key/value.
-// FIXME: isn't this just a `Source<FileAstId<N>>` ?
-#[derive(Debug)]
-pub(crate) struct AstId<N: AstNode> {
-    file_id: HirFileId,
-    file_ast_id: FileAstId<N>,
-}
-
-impl<N: AstNode> Clone for AstId<N> {
-    fn clone(&self) -> AstId<N> {
-        *self
-    }
-}
-impl<N: AstNode> Copy for AstId<N> {}
-
-impl<N: AstNode> PartialEq for AstId<N> {
-    fn eq(&self, other: &Self) -> bool {
-        (self.file_id, self.file_ast_id) == (other.file_id, other.file_ast_id)
-    }
-}
-impl<N: AstNode> Eq for AstId<N> {}
-impl<N: AstNode> Hash for AstId<N> {
-    fn hash<H: Hasher>(&self, hasher: &mut H) {
-        (self.file_id, self.file_ast_id).hash(hasher);
-    }
-}
-
-impl<N: AstNode> AstId<N> {
-    pub fn new(file_id: HirFileId, file_ast_id: FileAstId<N>) -> AstId<N> {
-        AstId { file_id, file_ast_id }
-    }
-
-    pub(crate) fn file_id(&self) -> HirFileId {
-        self.file_id
-    }
-
-    pub(crate) fn to_node(&self, db: &impl AstDatabase) -> N {
-        let syntax_node = db.ast_id_to_node(self.file_id, self.file_ast_id.into());
-        N::cast(syntax_node).unwrap()
-    }
-}
-
-pub(crate) fn ast_id_map_query(db: &impl AstDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
-    let map = if let Some(node) = db.parse_or_expand(file_id) {
-        AstIdMap::from_source(&node)
-    } else {
-        AstIdMap::default()
-    };
-    Arc::new(map)
-}
-
-pub(crate) fn file_item_query(
-    db: &impl AstDatabase,
-    file_id: HirFileId,
-    ast_id: ErasedFileAstId,
-) -> SyntaxNode {
-    let node = db.parse_or_expand(file_id).unwrap();
-    db.ast_id_map(file_id)[ast_id].to_node(&node)
-}