chore: eliminate unwraps

crates/els/channels.rs

@@ -208,7 +208,10 @@ macro_rules! impl_sendable {
             ) -> Result<(), mpsc::SendError<WorkerMessage<$Params>>> {
                 self.channels
                     .as_ref()
-                    .unwrap()
+                    .ok_or_else(|| {
+                        erg_common::lsp_log!("channels are closed");
+                        mpsc::SendError(WorkerMessage::Kill)
+                    })?
                     .$receiver
                     .send($crate::channels::WorkerMessage::Request(id, params))
             }

crates/els/completion.rs

@@ -416,12 +416,12 @@ impl CompletionCache {
     }
 
     pub fn get(&self, namespace: &str) -> Option<MappedRwLockReadGuard<Vec<CompletionItem>>> {
-        if self.cache.borrow().get(namespace).is_none() {
+        if self.cache.borrow().get(namespace).is_some() {
-            None
-        } else {
             Some(RwLockReadGuard::map(self.cache.borrow(), |cache| {
                 cache.get(namespace).unwrap()
             }))
+        } else {
+            None
         }
     }
 

crates/els/definition.rs

@@ -73,7 +73,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
                                     )));
                                 }
                             }
-                        } else if let Expr::Accessor(acc) = def.body.block.last().unwrap() {
+                        } else if let Some(Expr::Accessor(acc)) = def.body.block.last() {
                             let vi = acc.var_info();
                             match (&vi.def_loc.module, util::loc_to_range(vi.def_loc.loc)) {
                                 (Some(path), Some(range)) => {

crates/els/diagnostics.rs

@@ -160,7 +160,10 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
             }
         };
         let ast = self.build_ast(&uri).ok();
-        let ctx = checker.pop_context().unwrap();
+        let Some(ctx) = checker.pop_context() else {
+            _log!(self, "context not found");
+            return Ok(());
+        };
         if mode == "declare" {
             self.shared
                 .py_mod_cache

crates/els/inlay_hint.rs

@@ -318,7 +318,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
     ) -> ELSResult<InlayHint> {
         self.send_log(format!("inlay hint resolve request: {hint:?}"))?;
         if let Some(data) = &hint.data {
-            let Ok(uri) = data.as_str().unwrap().parse::<NormalizedUrl>() else {
+            let Some(uri) = data.as_str().and_then(|s| s.parse::<NormalizedUrl>().ok()) else {
                 return Ok(hint);
             };
             if let Some(module) = self.get_mod_ctx(&uri) {

crates/els/server.rs

@@ -851,7 +851,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
             HEALTH_CHECKER_ID => {
                 self.channels
                     .as_ref()
-                    .unwrap()
+                    .ok_or("channels not found")?
                     .health_check
                     .send(WorkerMessage::Request(0, ()))?;
             }
@@ -982,7 +982,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
         let mut ctxs = vec![];
         if let Ok(dir) = uri
             .to_file_path()
-            .and_then(|p| p.parent().unwrap().read_dir().map_err(|_| ()))
+            .and_then(|p| p.parent().ok_or(())?.read_dir().map_err(|_| ()))
         {
             for neighbor in dir {
                 let Ok(neighbor) = neighbor else {

crates/erg_common/levenshtein.rs

@@ -51,7 +51,7 @@ where
     let most_similar_name =
         candidates.min_by_key(|v| levenshtein(v.borrow(), name, limit).unwrap_or(usize::MAX))?;
     let dist = levenshtein(most_similar_name.borrow(), name, limit);
-    if dist.is_none() || dist.unwrap() >= limit {
+    if dist.map_or(true, |d| d >= limit) {
         None
     } else {
         Some(most_similar_name)
@@ -69,7 +69,7 @@ where
     let most_similar_name_and_some = candidates
         .min_by_key(|(_, v)| levenshtein(v.borrow(), name, limit).unwrap_or(usize::MAX))?;
     let dist = levenshtein(most_similar_name_and_some.1.borrow(), name, limit);
-    if dist.is_none() || dist.unwrap() >= limit {
+    if dist.map_or(true, |d| d >= limit) {
         None
     } else {
         Some(most_similar_name_and_some)

crates/erg_common/lib.rs

@@ -52,7 +52,7 @@ pub fn open_read(filename: &str) -> std::io::Result<String> {
 
 pub fn read_file(mut f: std::fs::File) -> std::io::Result<String> {
     let mut s = "".to_string();
-    std::io::Read::read_to_string(&mut f, &mut s).unwrap();
+    std::io::Read::read_to_string(&mut f, &mut s)?;
     Ok(s)
 }
 
@@ -183,7 +183,7 @@ pub fn unique_in_place<T: Eq + std::hash::Hash + Clone>(v: &mut Vec<T>) {
 
 /// at least, this is necessary for Windows and macOS
 pub fn normalize_path(path: PathBuf) -> PathBuf {
-    let verbatim_replaced = path.to_str().unwrap().replace("\\\\?\\", "");
+    let verbatim_replaced = path.to_string_lossy().replace("\\\\?\\", "");
     let lower = if !CASE_SENSITIVE {
         verbatim_replaced.to_lowercase()
     } else {

crates/erg_common/str.rs

@@ -233,6 +233,8 @@ impl Str {
     /// assert_eq!(s.split_with(&[".", "::"]), vec!["a", "b", "c"]);
     /// let s = Str::rc("ああ.いい::うう");
     /// assert_eq!(s.split_with(&[".", "::"]), vec!["ああ", "いい", "うう"]);
+    /// let s = Str::rc("abc");
+    /// assert_eq!(s.split_with(&[".", "::"]), vec!["abc"]);
     /// ```
     pub fn split_with(&self, seps: &[&str]) -> Vec<&str> {
         let mut result = vec![];

crates/erg_common/style.rs

@@ -521,7 +521,9 @@ impl StyledStrings {
     /// ```
     pub fn push_str(&mut self, s: &str) {
         if self.color_is(Color::Gray) {
-            self.texts.last_mut().unwrap().text.push_str(s);
+            if let Some(ss) = self.texts.last_mut() {
+                ss.text.push_str(s)
+            }
         } else {
             self.texts.push(StyledString::new(s, None, None));
         }

crates/erg_compiler/declare.rs

@@ -336,7 +336,14 @@ impl<A: ASTBuildable> GenericASTLowerer<A> {
     fn fake_lower_signature(&self, sig: ast::Signature) -> LowerResult<hir::Signature> {
         match sig {
             ast::Signature::Var(var) => {
-                let ident = var.ident().unwrap().clone();
+                let Some(ident) = var.ident().cloned() else {
+                    return Err(LowerErrors::from(LowerError::declare_error(
+                        self.cfg().input.clone(),
+                        line!() as usize,
+                        var.loc(),
+                        self.module.context.caused_by(),
+                    )));
+                };
                 let ident = hir::Identifier::bare(ident);
                 let t_spec = if let Some(ts) = var.t_spec {
                     let expr = self.fake_lower_expr(*ts.t_spec_as_expr.clone())?;

crates/erg_compiler/hir.rs

@@ -1191,7 +1191,11 @@ impl_stream!(RecordAttrs, Def);
 
 impl Locational for RecordAttrs {
     fn loc(&self) -> Location {
-        Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        if self.is_empty() {
+            Location::Unknown
+        } else {
+            Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        }
     }
 }
 
@@ -2319,8 +2323,8 @@ impl Def {
     }
 
     pub fn def_kind(&self) -> DefKind {
-        match self.body.block.first().unwrap() {
+        match self.body.block.first() {
-            Expr::Call(call) => match call.obj.show_acc().as_ref().map(|n| &n[..]) {
+            Some(Expr::Call(call)) => match call.obj.show_acc().as_ref().map(|n| &n[..]) {
                 Some("Class") => DefKind::Class,
                 Some("Inherit") => DefKind::Inherit,
                 Some("Trait") => DefKind::Trait,
@@ -2349,7 +2353,7 @@ impl Def {
     }
 
     pub fn get_base(&self) -> Option<&Record> {
-        match self.body.block.first().unwrap() {
+        match self.body.block.first()? {
             Expr::Call(call) => match call.obj.show_acc().as_ref().map(|n| &n[..]) {
                 Some("Class") | Some("Trait") => {
                     if let Some(Expr::Record(rec)) = call.args.get_left_or_key("Base") {

crates/erg_compiler/module/cache.rs

@@ -188,7 +188,13 @@ impl ModuleCache {
     }
 
     pub fn get_similar_name(&self, name: &str) -> Option<Str> {
-        get_similar_name(self.cache.iter().map(|(v, _)| v.to_str().unwrap()), name).map(Str::rc)
+        get_similar_name(
+            self.cache
+                .iter()
+                .map(|(v, _)| v.to_str().unwrap_or_default()),
+            name,
+        )
+        .map(Str::rc)
     }
 
     pub fn rename_path(&mut self, old: &NormalizedPathBuf, new: NormalizedPathBuf) {

crates/erg_compiler/ty/constructors.rs

@@ -105,7 +105,7 @@ pub fn py_module(path: TyParam) -> Type {
 }
 
 pub fn module_from_path<P: Into<PathBuf>>(path: P) -> Type {
-    let s = ValueObj::Str(Str::rc(path.into().to_str().unwrap()));
+    let s = ValueObj::Str(Str::rc(&path.into().to_string_lossy()));
     module(TyParam::Value(s))
 }
 

crates/erg_compiler/ty/mod.rs

@@ -2770,9 +2770,9 @@ impl Type {
             Self::Refinement(refine) => refine.t.namespace(),
             Self::Mono(name) | Self::Poly { name, .. } => {
                 let namespaces = name.split_with(&[".", "::"]);
-                if namespaces.len() > 1 {
+                if let Some(last) = namespaces.last() {
                     Str::rc(
-                        name.trim_end_matches(namespaces.last().unwrap())
+                        name.trim_end_matches(last)
                             .trim_end_matches('.')
                             .trim_end_matches("::"),
                     )

crates/erg_parser/ast.rs

@@ -1205,7 +1205,11 @@ impl NestedDisplay for ClassAttrs {
 
 impl Locational for ClassAttrs {
     fn loc(&self) -> Location {
-        Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        if self.is_empty() {
+            Location::Unknown
+        } else {
+            Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        }
     }
 }
 
@@ -1231,7 +1235,11 @@ impl NestedDisplay for RecordAttrs {
 
 impl Locational for RecordAttrs {
     fn loc(&self) -> Location {
-        Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        if self.is_empty() {
+            Location::Unknown
+        } else {
+            Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        }
     }
 }
 
@@ -6125,7 +6133,11 @@ impl_display_from_nested!(Module);
 
 impl Locational for Module {
     fn loc(&self) -> Location {
-        Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        if self.is_empty() {
+            Location::Unknown
+        } else {
+            Location::concat(self.0.first().unwrap(), self.0.last().unwrap())
+        }
     }
 }