feat: add variable hover message

now when hover over variables, lsp wold return the hover infomation in format of:
```
type

typedoc(if presents)
```

Author: Chronostasys

src/ast/ctx.rs

@@ -728,6 +728,8 @@ impl<'a, 'ctx> Ctx<'a> {
             return Err(self.add_diag(range.new_err(ErrorCode::REDECLARATION)));
         }
 
+        // add basic hover infomation for defs
+        self.save_if_var_hover(range, &pltype.borrow());
         self.add_symbol_without_check(name, pv, real_tp(pltype), range, is_glob, is_extern)
     }
     pub fn add_symbol_without_check(

src/ast/ctx/lsp.rs

@@ -57,6 +57,22 @@ impl Ctx<'_> {
         self.save_if_hover(range, HoverContents::Array(content))
     }
 
+    /// # save_if_var_hover
+    ///
+    /// save infomation to display if the variable is hovered
+    pub fn save_if_var_hover(&self, range: Range, tp: &PLType) {
+        if self.need_highlight.borrow().ne(&0) {
+            return;
+        }
+        let mut content = vec![];
+        let mut string = String::new();
+        string.push_str(&tp.get_name());
+        string.push_str("\n\n");
+        string.push_str(&tp.get_docs().unwrap_or("".to_string()));
+        content.push(MarkedString::String(string));
+        self.save_if_hover(range, HoverContents::Array(content))
+    }
+
     pub fn save_if_hover(&self, range: Range, value: HoverContents) {
         if self.need_highlight.borrow().ne(&0) {
             return;

src/ast/node/function.rs

@@ -222,11 +222,14 @@ impl Node for FuncCallNode {
         ctx: &'b mut Ctx<'a>,
         builder: &'b BuilderEnum<'a, '_>,
     ) -> NodeResult {
-        let id_range = self.callee.range();
+        let mut id_range = self.callee.range();
         let v = self.callee.emit(ctx, builder)?.get_value();
         if v.is_none() {
             return Err(ctx.add_diag(self.range.new_err(ErrorCode::FUNCTION_NOT_FOUND)));
         }
+        if let NodeEnum::Take(tk) = &*self.callee {
+            id_range = tk.field.as_ref().map(|f| f.range).unwrap_or(tk.range);
+        }
         let v = v.unwrap();
         if let Some(builtin) = BUILTIN_FN_MAP.get(&v.get_value()) {
             return builtin(self, ctx, builder);

src/ast/node/primary.rs

@@ -179,6 +179,7 @@ impl Node for VarNode {
                     0
                 },
             );
+            ctx.save_if_var_hover(self.range, &symbol.get_data_ref().pltype.borrow());
 
             let symbol_data = symbol.get_data();
             let symbol_value = match ctx.generator_data {