implement feature flags

crates/ra_ide_api/src/lib.rs

@@ -14,6 +14,7 @@ mod db;
 pub mod mock_analysis;
 mod symbol_index;
 mod change;
+mod feature_flags;
 
 mod status;
 mod completion;
@@ -63,6 +64,7 @@ pub use crate::{
     completion::{CompletionItem, CompletionItemKind, InsertTextFormat},
     diagnostics::Severity,
     display::{file_structure, FunctionSignature, NavigationTarget, StructureNode},
+    feature_flags::FeatureFlags,
     folding_ranges::{Fold, FoldKind},
     hover::HoverResult,
     inlay_hints::{InlayHint, InlayKind},
@@ -247,13 +249,13 @@ pub struct AnalysisHost {
 
 impl Default for AnalysisHost {
     fn default() -> AnalysisHost {
-        AnalysisHost::new(None)
+        AnalysisHost::new(None, FeatureFlags::default())
     }
 }
 
 impl AnalysisHost {
-    pub fn new(lru_capcity: Option<usize>) -> AnalysisHost {
-        AnalysisHost { db: db::RootDatabase::new(lru_capcity) }
+    pub fn new(lru_capcity: Option<usize>, feature_flags: FeatureFlags) -> AnalysisHost {
+        AnalysisHost { db: db::RootDatabase::new(lru_capcity, feature_flags) }
     }
     /// Returns a snapshot of the current state, which you can query for
     /// semantic information.
@@ -261,6 +263,10 @@ impl AnalysisHost {
         Analysis { db: self.db.snapshot() }
     }
 
+    pub fn feature_flags(&self) -> &FeatureFlags {
+        &self.db.feature_flags
+    }
+
     /// Applies changes to the current state of the world. If there are
     /// outstanding snapshots, they will be canceled.
     pub fn apply_change(&mut self, change: AnalysisChange) {
@@ -319,6 +325,10 @@ impl Analysis {
         (host.analysis(), file_id)
     }
 
+    pub fn feature_flags(&self) -> &FeatureFlags {
+        &self.db.feature_flags
+    }
+
     /// Debug info about the current state of the analysis
     pub fn status(&self) -> Cancelable<String> {
         self.with_db(|db| status::status(&*db))