5 files changed, 18 insertions, 50 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 625f2aeac..d1a294c30 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -509,14 +509,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "once_cell"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "owning_ref"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -610,9 +602,6 @@ name = "ra_analysis"
 version = "0.1.0"
 dependencies = [
  "fst 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "once_cell 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "ra_editor 0.1.0",
  "ra_syntax 0.1.0",
  "rayon 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1330,7 +1319,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "e83d528d2677f0518c570baf2b7abdcf0cd2d248860b68507bdcb3e91d4c0cea"
 "checksum num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0b3a5d7cc97d6d30d8b9bc8fa19bf45349ffe46241e8816f50f62f6d6aaabee1"
 "checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
-"checksum once_cell 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "d7ce3535d54560c937c1652ba4a0da66bfc63e0f8e07bed127483afb6e5ee925"
 "checksum owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cdf84f41639e037b484f93433aa3897863b561ed65c6e59c7073d7c561710f37"
 "checksum parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f0802bff09003b291ba756dc7e79313e51cc31667e94afbe847def490424cde5"
 "checksum parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ad7f7e6ebdc79edff6fdcb87a55b620174f7a989e3eb31b65231f4af57f00b8c"
diff --git a/crates/ra_analysis/Cargo.toml b/crates/ra_analysis/Cargo.toml
index 0f5ff6d24..75a9dc844 100644
--- a/crates/ra_analysis/Cargo.toml
+++ b/crates/ra_analysis/Cargo.toml
@@ -6,9 +6,6 @@ authors = ["Aleksey Kladov <[email protected]>"]
 
 [dependencies]
 relative-path = "0.4.0"
-log = "0.4.2"
-parking_lot = "0.6.3"
-once_cell = "0.1.5"
 rayon = "1.0.2"
 fst = "0.3.1"
 ra_syntax = { path = "../ra_syntax" }
diff --git a/crates/ra_analysis/src/imp.rs b/crates/ra_analysis/src/imp.rs
index 83a0dc445..f142b6c43 100644
--- a/crates/ra_analysis/src/imp.rs
+++ b/crates/ra_analysis/src/imp.rs
@@ -16,7 +16,8 @@ use relative_path::RelativePath;
 use rustc_hash::FxHashSet;
 
 use crate::{
-    descriptors::module::{ModuleTree, Problem},
+    db::SyntaxDatabase,
+    descriptors::module::{ModulesDatabase, ModuleTree, Problem},
     descriptors::{FnDescriptor},
     roots::{ReadonlySourceRoot, SourceRoot, WritableSourceRoot},
     CrateGraph, CrateId, Diagnostic, FileId, FileResolver, FileSystemEdit, Position,
@@ -143,10 +144,10 @@ impl AnalysisImpl {
             .unwrap()
     }
     pub fn file_syntax(&self, file_id: FileId) -> File {
-        self.root(file_id).syntax(file_id)
+        self.root(file_id).db().file_syntax(file_id)
     }
     pub fn file_line_index(&self, file_id: FileId) -> Arc<LineIndex> {
-        self.root(file_id).lines(file_id)
+        self.root(file_id).db().file_lines(file_id)
     }
     pub fn world_symbols(&self, query: Query) -> Cancelable<Vec<(FileId, FileSymbol)>> {
         let mut buf = Vec::new();
@@ -161,14 +162,14 @@ impl AnalysisImpl {
     }
     pub fn parent_module(&self, file_id: FileId) -> Cancelable<Vec<(FileId, FileSymbol)>> {
         let root = self.root(file_id);
-        let module_tree = root.module_tree()?;
+        let module_tree = root.db().module_tree()?;
 
         let res = module_tree.modules_for_file(file_id)
             .into_iter()
             .filter_map(|module_id| {
                 let link = module_id.parent_link(&module_tree)?;
                 let file_id = link.owner(&module_tree).file_id(&module_tree);
-                let syntax = root.syntax(file_id);
+                let syntax = root.db().file_syntax(file_id);
                 let decl = link.bind_source(&module_tree, syntax.ast());
 
                 let sym = FileSymbol {
@@ -182,7 +183,7 @@ impl AnalysisImpl {
         Ok(res)
     }
     pub fn crate_for(&self, file_id: FileId) -> Cancelable<Vec<CrateId>> {
-        let module_tree = self.root(file_id).module_tree()?;
+        let module_tree = self.root(file_id).db().module_tree()?;
         let crate_graph = &self.data.crate_graph;
         let res = module_tree.modules_for_file(file_id)
             .into_iter()
@@ -202,8 +203,8 @@ impl AnalysisImpl {
         offset: TextUnit,
     ) -> Cancelable<Vec<(FileId, FileSymbol)>> {
         let root = self.root(file_id);
-        let module_tree = root.module_tree()?;
-        let file = root.syntax(file_id);
+        let module_tree = root.db().module_tree()?;
+        let file = root.db().file_syntax(file_id);
         let syntax = file.syntax();
         if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, offset) {
             // First try to resolve the symbol locally
@@ -253,7 +254,7 @@ impl AnalysisImpl {
 
     pub fn find_all_refs(&self, file_id: FileId, offset: TextUnit) -> Vec<(FileId, TextRange)> {
         let root = self.root(file_id);
-        let file = root.syntax(file_id);
+        let file = root.db().file_syntax(file_id);
         let syntax = file.syntax();
 
         let mut ret = vec![];
@@ -285,8 +286,8 @@ impl AnalysisImpl {
 
     pub fn diagnostics(&self, file_id: FileId) -> Cancelable<Vec<Diagnostic>> {
         let root = self.root(file_id);
-        let module_tree = root.module_tree()?;
-        let syntax = root.syntax(file_id);
+        let module_tree = root.db().module_tree()?;
+        let syntax = root.db().file_syntax(file_id);
 
         let mut res = ra_editor::diagnostics(&syntax)
             .into_iter()
@@ -376,7 +377,7 @@ impl AnalysisImpl {
         offset: TextUnit,
     ) -> Cancelable<Option<(FnDescriptor, Option<usize>)>> {
         let root = self.root(file_id);
-        let file = root.syntax(file_id);
+        let file = root.db().file_syntax(file_id);
         let syntax = file.syntax();
 
         // Find the calling expression and it's NameRef
diff --git a/crates/ra_analysis/src/lib.rs b/crates/ra_analysis/src/lib.rs
index a03f44205..67a239a5c 100644
--- a/crates/ra_analysis/src/lib.rs
+++ b/crates/ra_analysis/src/lib.rs
@@ -1,8 +1,4 @@
-extern crate parking_lot;
-#[macro_use]
-extern crate log;
 extern crate fst;
-extern crate once_cell;
 extern crate ra_editor;
 extern crate ra_syntax;
 extern crate rayon;
diff --git a/crates/ra_analysis/src/roots.rs b/crates/ra_analysis/src/roots.rs
index 15081f555..aa0243720 100644
--- a/crates/ra_analysis/src/roots.rs
+++ b/crates/ra_analysis/src/roots.rs
@@ -17,9 +17,7 @@ use crate::{
 
 pub(crate) trait SourceRoot {
     fn contains(&self, file_id: FileId) -> bool;
-    fn module_tree(&self) -> Cancelable<Arc<ModuleTree>>;
-    fn lines(&self, file_id: FileId) -> Arc<LineIndex>;
-    fn syntax(&self, file_id: FileId) -> File;
+    fn db(&self) -> &db::RootDatabase;
     fn symbols(&self, acc: &mut Vec<Arc<SymbolIndex>>) -> Cancelable<()>;
 }
 
@@ -63,17 +61,11 @@ impl WritableSourceRoot {
 }
 
 impl SourceRoot for WritableSourceRoot {
-    fn module_tree(&self) -> Cancelable<Arc<ModuleTree>> {
-        self.db.module_tree()
-    }
     fn contains(&self, file_id: FileId) -> bool {
         self.db.file_set().files.contains(&file_id)
     }
-    fn lines(&self, file_id: FileId) -> Arc<LineIndex> {
-        self.db.file_lines(file_id)
-    }
-    fn syntax(&self, file_id: FileId) -> File {
-        self.db.file_syntax(file_id)
+    fn db(&self) -> &db::RootDatabase {
+        &self.db
     }
     fn symbols<'a>(&'a self, acc: &mut Vec<Arc<SymbolIndex>>) -> Cancelable<()> {
         for &file_id in self.db.file_set().files.iter() {
@@ -114,17 +106,11 @@ impl ReadonlySourceRoot {
 }
 
 impl SourceRoot for ReadonlySourceRoot {
-    fn module_tree(&self) -> Cancelable<Arc<ModuleTree>> {
-        self.db.module_tree()
-    }
     fn contains(&self, file_id: FileId) -> bool {
         self.db.file_set().files.contains(&file_id)
     }
-    fn lines(&self, file_id: FileId) -> Arc<LineIndex> {
-        self.db.file_lines(file_id)
-    }
-    fn syntax(&self, file_id: FileId) -> File {
-        self.db.file_syntax(file_id)
+    fn db(&self) -> &db::RootDatabase {
+        &self.db
     }
     fn symbols(&self, acc: &mut Vec<Arc<SymbolIndex>>) -> Cancelable<()> {
         acc.push(Arc::clone(&self.symbol_index));