feat(els): module hover link

crates/els/README.md

@@ -30,6 +30,7 @@ ELS is a language server for the [Erg](https://github.com/erg-lang/erg) programm
 - [x] Workspace symbol
 - [x] Document symbol
 - [x] Document highlight
+- [x] Document link
 - [x] Call hierarchy
 - [x] Folding range
   - [x] Folding imports

crates/els/hover.rs

@@ -4,10 +4,14 @@ use erg_common::trim_eliminate_top_indent;
 use erg_compiler::artifact::BuildRunnable;
 use erg_compiler::erg_parser::parse::Parsable;
 use erg_compiler::erg_parser::token::{Token, TokenCategory, TokenKind};
+use erg_compiler::hir::Expr;
+use erg_compiler::ty::HasType;
 use erg_compiler::varinfo::{AbsLocation, VarInfo};
 
 use lsp_types::{Hover, HoverContents, HoverParams, MarkedString, Url};
 
+#[allow(unused)]
+use crate::_log;
 use crate::server::{ELSResult, RedirectableStdout, Server};
 use crate::util::{self, NormalizedUrl};
 
@@ -175,6 +179,48 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
                     }
                 }
             }
+            if let Some(visitor) = self.get_visitor(&uri) {
+                let url = match visitor.get_min_expr(pos) {
+                    Some(Expr::Def(def)) => def
+                        .sig
+                        .ref_t()
+                        .module_path()
+                        .and_then(|path| Url::from_file_path(path).ok()),
+                    Some(Expr::Call(call)) => {
+                        call.call_signature_t().return_t().and_then(|ret_t| {
+                            ret_t
+                                .module_path()
+                                .and_then(|path| Url::from_file_path(path).ok())
+                        })
+                    }
+                    Some(expr) => expr
+                        .ref_t()
+                        .module_path()
+                        .or_else(|| {
+                            expr.ref_t()
+                                .inner_ts()
+                                .into_iter()
+                                .find_map(|t| t.module_path())
+                        })
+                        .and_then(|path| Url::from_file_path(path).ok()),
+                    _ => None,
+                };
+                if let Some(url) = url {
+                    let path = url.to_file_path().unwrap().with_extension("");
+                    let name = if path.ends_with("__init__") || path.ends_with("__init__.d") {
+                        path.parent()
+                            .unwrap()
+                            .file_stem()
+                            .unwrap()
+                            .to_string_lossy()
+                    } else {
+                        path.file_stem().unwrap().to_string_lossy()
+                    };
+                    contents.push(MarkedString::from_markdown(format!(
+                        "Go to [{name}]({url})",
+                    )));
+                }
+            }
         } else {
             self.send_log("lex error")?;
         }

crates/els/server.rs

@@ -87,11 +87,16 @@ pub enum DefaultFeatures {
     Diagnostics,
     FindReferences,
     GotoDefinition,
+    GotoTypeDefinition,
     Hover,
     InlayHint,
     Rename,
     SemanticTokens,
     SignatureHelp,
+    DocumentHighlight,
+    DocumentLink,
+    FoldingRange,
+    SelectionRange,
     /* ELS specific features */
     SmartCompletion,
     DeepCompletion,
@@ -116,9 +121,20 @@ impl From<&str> for DefaultFeatures {
             "gotodefinition" | "gotoDefinition" | "goto-definition" => {
                 DefaultFeatures::GotoDefinition
             }
+            "gototypedefinition" | "gotoTypeDefinition" | "goto-type-definition" => {
+                DefaultFeatures::GotoTypeDefinition
+            }
             "signaturehelp" | "signatureHelp" | "signature-help" | "code-signature" => {
                 DefaultFeatures::SignatureHelp
             }
+            "documenthighlight" | "documentHighlight" | "document-highlight" => {
+                DefaultFeatures::DocumentHighlight
+            }
+            "documentlink" | "documentLink" | "document-link" => DefaultFeatures::DocumentLink,
+            "foldingrange" | "foldingRange" | "folding-range" => DefaultFeatures::FoldingRange,
+            "selectionrange" | "selectionRange" | "selection-range" => {
+                DefaultFeatures::SelectionRange
+            }
             "smartcompletion" | "smartCompletion" | "smart-completion" => {
                 DefaultFeatures::SmartCompletion
             }
@@ -452,7 +468,14 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
         let mut comp_options = CompletionOptions::default();
         comp_options.trigger_characters = Some(TRIGGER_CHARS.map(String::from).to_vec());
         comp_options.resolve_provider = Some(true);
-        capabilities.completion_provider = Some(comp_options);
+        capabilities.completion_provider = if self
+            .disabled_features
+            .contains(&DefaultFeatures::Completion)
+        {
+            None
+        } else {
+            Some(comp_options)
+        };
         capabilities.rename_provider = Some(OneOf::Left(true));
         capabilities.references_provider = Some(OneOf::Left(true));
         capabilities.definition_provider = Some(OneOf::Left(true));
@@ -530,20 +553,40 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
                     work_done_progress: None,
                 },
             });
-        capabilities.code_lens_provider = Some(CodeLensOptions {
-            resolve_provider: Some(false),
-        });
+        capabilities.code_lens_provider =
+            if self.disabled_features.contains(&DefaultFeatures::CodeLens) {
+                None
+            } else {
+                Some(CodeLensOptions {
+                    resolve_provider: Some(false),
+                })
+            };
         capabilities.workspace_symbol_provider = Some(OneOf::Left(true));
         capabilities.document_symbol_provider = Some(OneOf::Left(true));
-        capabilities.document_link_provider = Some(DocumentLinkOptions {
-            resolve_provider: Some(false),
-            work_done_progress_options: Default::default(),
-        });
+        capabilities.document_link_provider = if self
+            .disabled_features
+            .contains(&DefaultFeatures::DocumentLink)
+        {
+            None
+        } else {
+            Some(DocumentLinkOptions {
+                resolve_provider: Some(false),
+                work_done_progress_options: Default::default(),
+            })
+        };
         capabilities.call_hierarchy_provider = Some(CallHierarchyServerCapability::Simple(true));
-        capabilities.folding_range_provider = Some(FoldingRangeProviderCapability::Simple(true));
+        capabilities.folding_range_provider = Some(FoldingRangeProviderCapability::Simple(
+            self.disabled_features
+                .contains(&DefaultFeatures::FoldingRange)
+                .not(),
+        ));
         capabilities.selection_range_provider =
             Some(SelectionRangeProviderCapability::Simple(true));
-        capabilities.document_highlight_provider = Some(OneOf::Left(true));
+        capabilities.document_highlight_provider = Some(OneOf::Left(
+            self.disabled_features
+                .contains(&DefaultFeatures::DocumentHighlight)
+                .not(),
+        ));
         capabilities
     }
 

crates/erg_compiler/hir.rs

@@ -1517,10 +1517,16 @@ impl Call {
         }
     }
 
+    pub fn call_signature_t(&self) -> &Type {
+        if let Some(attr) = self.attr_name.as_ref() {
+            attr.ref_t()
+        } else {
+            self.obj.ref_t()
+        }
+    }
+
     pub fn is_method_call(&self) -> bool {
-        self.signature_t()
-            .map(|t| t.self_t().is_some())
-            .unwrap_or(false)
+        self.call_signature_t().self_t().is_some()
     }
 
     pub fn additional_operation(&self) -> Option<OperationKind> {

crates/erg_compiler/ty/mod.rs

@@ -1891,6 +1891,7 @@ impl HasType for Type {
                 )
                 .chain(sub.var_params.as_deref().map(|pt| pt.typ().clone()))
                 .chain(sub.non_default_params.iter().map(|pt| pt.typ().clone()))
+                .chain(sub.kw_var_params.as_deref().map(|pt| pt.typ().clone()))
                 .chain([*sub.return_t.clone()])
                 .collect(),
             Self::Callable { param_ts, .. } => param_ts.clone(),