feat: symbol display

src/ty/common.rs

@@ -3,6 +3,7 @@ use std::ops::Deref;
 
 use derive_more::Constructor;
 use ecow::EcoString;
+use regex::Regex;
 
 #[derive(Clone, Debug, PartialEq, Constructor)]
 pub struct Catchable {
@@ -30,7 +31,17 @@ impl<T: Into<EcoString>> From<T> for Symbol {
 
 impl Display for Symbol {
     fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
-        write!(f, r#"Sym({})"#, self.0)
+        if self.normal() {
+            write!(f, r#""{}""#, self.0)
+        } else {
+            write!(f, "{}", self.0)
+        }
+    }
+}
+
+impl Symbol {
+    fn normal(&self) -> bool {
+        !Regex::new(r#"^[a-zA-Z\_][a-zA-Z0-9\_\'\-]*$"#).unwrap().is_match(self)
     }
 }