feat(els): add deep completion

crates/erg_compiler/context/mod.rs

@@ -1034,6 +1034,10 @@ impl Context {
         attrs
     }
 
+    pub fn local_dir(&self) -> Dict<&VarName, &VarInfo> {
+        self.type_dir(self)
+    }
+
     pub(crate) fn mod_cache(&self) -> &SharedModuleCache {
         &self.shared().mod_cache
     }

crates/erg_compiler/module/cache.rs

@@ -145,6 +145,10 @@ impl ModuleCache {
             self.cache.insert(new, entry);
         }
     }
+
+    pub fn iter(&self) -> impl Iterator<Item = (&PathBuf, &ModuleEntry)> {
+        self.cache.iter()
+    }
 }
 
 #[derive(Debug, Clone, Default)]
@@ -161,6 +165,14 @@ impl SharedModuleCache {
         Self(Shared::new(ModuleCache::new()))
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.0.borrow().cache.is_empty()
+    }
+
+    pub fn len(&self) -> usize {
+        self.0.borrow().cache.len()
+    }
+
     pub fn get<Q: Eq + Hash + ?Sized>(&self, path: &Q) -> Option<&ModuleEntry>
     where
         PathBuf: Borrow<Q>,
@@ -230,4 +242,9 @@ impl SharedModuleCache {
     pub fn rename_path(&self, path: &PathBuf, new: PathBuf) {
         self.0.borrow_mut().rename_path(path, new);
     }
+
+    pub fn iter(&self) -> impl Iterator<Item = (&PathBuf, &ModuleEntry)> {
+        let ref_ = unsafe { self.0.as_ptr().as_ref().unwrap() };
+        ref_.iter()
+    }
 }