Minimize FileLoader interface

Author: matklad

crates/ra_db/src/lib.rs

@@ -89,14 +89,13 @@ pub const DEFAULT_LRU_CAP: usize = 128;
 pub trait FileLoader {
     /// Text of the file.
     fn file_text(&self, file_id: FileId) -> Arc<String>;
+    /// Note that we intentionally accept a `&str` and not a `&Path` here. This
+    /// method exists to handle `#[path = "/some/path.rs"] mod foo;` and such,
+    /// so the input is guaranteed to be utf-8 string. We might introduce
+    /// `struct StrPath(str)` for clarity some day, but it's a bit messy, so we
+    /// get by with a `&str` for the time being.
     fn resolve_path(&self, anchor: FileId, path: &str) -> Option<FileId>;
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>>;
-
-    fn resolve_extern_path(
-        &self,
-        extern_id: ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId>;
 }
 
 /// Database which stores all significant input facts: source code and project
@@ -154,34 +153,30 @@ impl<T: SourceDatabaseExt> FileLoader for FileLoaderDelegate<&'_ T> {
     fn file_text(&self, file_id: FileId) -> Arc<String> {
         SourceDatabaseExt::file_text(self.0, file_id)
     }
-    /// Note that we intentionally accept a `&str` and not a `&Path` here. This
-    /// method exists to handle `#[path = "/some/path.rs"] mod foo;` and such,
-    /// so the input is guaranteed to be utf-8 string. We might introduce
-    /// `struct StrPath(str)` for clarity some day, but it's a bit messy, so we
-    /// get by with a `&str` for the time being.
     fn resolve_path(&self, anchor: FileId, path: &str) -> Option<FileId> {
-        let rel_path = {
-            let mut rel_path = self.0.file_relative_path(anchor);
-            assert!(rel_path.pop());
-            rel_path.push(path);
-            rel_path.normalize()
-        };
-        let source_root = self.0.file_source_root(anchor);
-        let source_root = self.0.source_root(source_root);
-        source_root.file_by_relative_path(&rel_path)
+        // FIXME: this *somehow* should be platform agnostic...
+        if std::path::Path::new(path).is_absolute() {
+            let krate = *self.relevant_crates(anchor).get(0)?;
+            let (extern_source_id, relative_file) =
+                self.0.crate_graph()[krate].extern_source.extern_path(path)?;
+
+            let source_root = self.0.source_root(SourceRootId(extern_source_id.0));
+            source_root.file_by_relative_path(&relative_file)
+        } else {
+            let rel_path = {
+                let mut rel_path = self.0.file_relative_path(anchor);
+                assert!(rel_path.pop());
+                rel_path.push(path);
+                rel_path.normalize()
+            };
+            let source_root = self.0.file_source_root(anchor);
+            let source_root = self.0.source_root(source_root);
+            source_root.file_by_relative_path(&rel_path)
+        }
     }
 
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
         let source_root = self.0.file_source_root(file_id);
         self.0.source_root_crates(source_root)
     }
-
-    fn resolve_extern_path(
-        &self,
-        extern_id: ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId> {
-        let source_root = self.0.source_root(SourceRootId(extern_id.0));
-        source_root.file_by_relative_path(&relative_path)
-    }
 }

crates/ra_hir_def/src/test_db.rs

@@ -6,9 +6,7 @@ use std::{
 };
 
 use hir_expand::db::AstDatabase;
-use ra_db::{
-    salsa, CrateId, ExternSourceId, FileId, FileLoader, FileLoaderDelegate, RelativePath, Upcast,
-};
+use ra_db::{salsa, CrateId, FileId, FileLoader, FileLoaderDelegate, Upcast};
 
 use crate::db::DefDatabase;
 
@@ -64,14 +62,6 @@ impl FileLoader for TestDB {
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
-
-    fn resolve_extern_path(
-        &self,
-        extern_id: ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId> {
-        FileLoaderDelegate(self).resolve_extern_path(extern_id, relative_path)
-    }
 }
 
 impl TestDB {

crates/ra_hir_expand/src/builtin_macro.rs

@@ -295,19 +295,13 @@ fn concat_expand(
 
 fn relative_file(db: &dyn AstDatabase, call_id: MacroCallId, path: &str) -> Option<FileId> {
     let call_site = call_id.as_file().original_file(db);
-
-    // Handle trivial case
-    if let Some(res) = db.resolve_path(call_site, path) {
-        // Prevent include itself
-        return if res == call_site { None } else { Some(res) };
+    let res = db.resolve_path(call_site, path)?;
+    // Prevent include itself
+    if res == call_site {
+        None
+    } else {
+        Some(res)
     }
-
-    // Extern paths ?
-    let krate = *db.relevant_crates(call_site).get(0)?;
-    let (extern_source_id, relative_file) =
-        db.crate_graph()[krate].extern_source.extern_path(path)?;
-
-    db.resolve_extern_path(extern_source_id, &relative_file)
 }
 
 fn parse_string(tt: &tt::Subtree) -> Result<String, mbe::ExpandError> {

crates/ra_hir_expand/src/test_db.rs

@@ -5,7 +5,7 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-use ra_db::{salsa, CrateId, ExternSourceId, FileId, FileLoader, FileLoaderDelegate, RelativePath};
+use ra_db::{salsa, CrateId, FileId, FileLoader, FileLoaderDelegate};
 
 #[salsa::database(
     ra_db::SourceDatabaseExtStorage,
@@ -47,11 +47,4 @@ impl FileLoader for TestDB {
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
-    fn resolve_extern_path(
-        &self,
-        anchor: ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId> {
-        FileLoaderDelegate(self).resolve_extern_path(anchor, relative_path)
-    }
 }

crates/ra_hir_ty/src/test_db.rs

@@ -7,9 +7,7 @@ use std::{
 
 use hir_def::{db::DefDatabase, AssocItemId, ModuleDefId, ModuleId};
 use hir_expand::{db::AstDatabase, diagnostics::DiagnosticSink};
-use ra_db::{
-    salsa, CrateId, FileId, FileLoader, FileLoaderDelegate, RelativePath, SourceDatabase, Upcast,
-};
+use ra_db::{salsa, CrateId, FileId, FileLoader, FileLoaderDelegate, SourceDatabase, Upcast};
 use stdx::format_to;
 
 use crate::{db::HirDatabase, diagnostics::Diagnostic, expr::ExprValidator};
@@ -78,13 +76,6 @@ impl FileLoader for TestDB {
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
-    fn resolve_extern_path(
-        &self,
-        extern_id: ra_db::ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId> {
-        FileLoaderDelegate(self).resolve_extern_path(extern_id, relative_path)
-    }
 }
 
 impl TestDB {

crates/ra_ide_db/src/lib.rs

@@ -16,8 +16,8 @@ use std::sync::Arc;
 use hir::db::{AstDatabase, DefDatabase};
 use ra_db::{
     salsa::{self, Database, Durability},
-    Canceled, CheckCanceled, CrateId, FileId, FileLoader, FileLoaderDelegate, RelativePath,
-    SourceDatabase, SourceRootId, Upcast,
+    Canceled, CheckCanceled, CrateId, FileId, FileLoader, FileLoaderDelegate, SourceDatabase,
+    SourceRootId, Upcast,
 };
 use rustc_hash::FxHashMap;
 
@@ -63,13 +63,6 @@ impl FileLoader for RootDatabase {
     fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
-    fn resolve_extern_path(
-        &self,
-        extern_id: ra_db::ExternSourceId,
-        relative_path: &RelativePath,
-    ) -> Option<FileId> {
-        FileLoaderDelegate(self).resolve_extern_path(extern_id, relative_path)
-    }
 }
 
 impl salsa::Database for RootDatabase {