Encapsulate CrateGraph a bit

crates/ra_analysis/Cargo.toml

@@ -11,7 +11,7 @@ rayon = "1.0.2"
 fst = "0.3.1"
 ra_syntax = { path = "../ra_syntax" }
 ra_editor = { path = "../ra_editor" }
-salsa = "0.6.2"
+salsa = "0.6.1"
 rustc-hash = "1.0"
 
 [dev-dependencies]

crates/ra_analysis/src/lib.rs

@@ -15,9 +15,9 @@ mod completion;
 use std::{
     fmt,
     sync::Arc,
-    collections::BTreeMap,
 };
 
+use rustc_hash::FxHashMap;
 use ra_syntax::{AtomEdit, File, TextRange, TextUnit};
 use relative_path::{RelativePath, RelativePathBuf};
 use rayon::prelude::*;
@@ -55,9 +55,21 @@ pub struct FileId(pub u32);
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct CrateId(pub u32);
 
-#[derive(Debug, Clone, Default, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
 pub struct CrateGraph {
-    pub crate_roots: BTreeMap<CrateId, FileId>,
+    crate_roots: FxHashMap<CrateId, FileId>,
+}
+
+impl CrateGraph {
+    pub fn new() -> CrateGraph {
+        CrateGraph::default()
+    }
+    pub fn add_crate_root(&mut self, file_id: FileId) -> CrateId{
+        let crate_id = CrateId(self.crate_roots.len() as u32);
+        let prev = self.crate_roots.insert(crate_id, file_id);
+        assert!(prev.is_none());
+        crate_id
+    }
 }
 
 pub trait FileResolver: fmt::Debug + Send + Sync + 'static {

crates/ra_analysis/tests/tests.rs

@@ -7,7 +7,6 @@ extern crate test_utils;
 
 use std::{
     sync::Arc,
-    collections::BTreeMap,
 };
 
 use ra_syntax::TextRange;
@@ -130,19 +129,17 @@ fn test_resolve_crate_root() {
     let snap = host.analysis();
     assert!(snap.crate_for(FileId(2)).unwrap().is_empty());
 
-    let crate_graph = CrateGraph {
-        crate_roots: {
-            let mut m = BTreeMap::default();
-            m.insert(CrateId(1), FileId(1));
-            m
-        },
+    let crate_graph = {
+        let mut g = CrateGraph::new();
+        g.add_crate_root(FileId(1));
+        g
     };
     let mut change = AnalysisChange::new();
     change.set_crate_graph(crate_graph);
     host.apply_change(change);
     let snap = host.analysis();
 
-    assert_eq!(snap.crate_for(FileId(2)).unwrap(), vec![CrateId(1)],);
+    assert_eq!(snap.crate_for(FileId(2)).unwrap(), vec![CrateId(0)],);
 }
 
 #[test]

crates/ra_lsp_server/src/server_world.rs

@@ -2,11 +2,10 @@ use std::{
     fs,
     path::{Path, PathBuf},
     sync::Arc,
-    collections::BTreeMap,
 };
 
 use languageserver_types::Url;
-use ra_analysis::{Analysis, AnalysisHost, AnalysisChange, CrateGraph, CrateId, FileId, FileResolver, LibraryData};
+use ra_analysis::{Analysis, AnalysisHost, AnalysisChange, CrateGraph, FileId, FileResolver, LibraryData};
 use rustc_hash::FxHashMap;
 
 use crate::{
@@ -149,7 +148,7 @@ impl ServerWorldState {
         Ok(file_id)
     }
     pub fn set_workspaces(&mut self, ws: Vec<CargoWorkspace>) {
-        let mut crate_roots = BTreeMap::default();
+        let mut crate_graph = CrateGraph::new();
         ws.iter()
             .flat_map(|ws| {
                 ws.packages()
@@ -158,11 +157,9 @@ impl ServerWorldState {
             })
             .for_each(|root| {
                 if let Some(file_id) = self.path_map.get_id(root) {
-                    let crate_id = CrateId(crate_roots.len() as u32);
-                    crate_roots.insert(crate_id, file_id);
+                    crate_graph.add_crate_root(file_id);
                 }
             });
-        let crate_graph = CrateGraph { crate_roots };
         self.workspaces = Arc::new(ws);
         let mut change = AnalysisChange::new();
         change.set_crate_graph(crate_graph);