From bbb40d746368eb6a38498649a723c7ead0ef8136 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Fri, 5 Jun 2020 16:45:20 +0200
Subject: Minimize FileLoader interface

---
 crates/ra_db/src/lib.rs | 53 ++++++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 29 deletions(-)

(limited to 'crates/ra_db/src')

diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index 2e63cb46e..7354b3832 100644
--- a/crates/ra_db/src/lib.rs
+++ b/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)
-    }
 }
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