all tests green

Signed-off-by: Ava Hahn <ava@aidanis.online>

src/lex.rs

@@ -201,7 +201,25 @@ fn process(document: &String) -> Result<Box<Seg>, String> {
     if is_str {
         Err(UNMATCHED_STR_DELIM.to_string())
     } else {
-        Err(UNMATCHED_LIST_DELIM.to_string())
+        if ref_stack.is_empty() {
+            let obj;
+            if token == "true" {
+                obj = Box::from(Ctr::Bool(true));
+            } else if token == "false" {
+                obj = Box::from(Ctr::Bool(false));
+            } else if let Ok(i) = token.parse::<i128>() {
+                obj = Box::from(Ctr::Integer(i));
+            } else if let Ok(f) = token.parse::<f64>() {
+                obj = Box::from(Ctr::Float(f));
+            } else if let Some(s) = tok_is_symbol(&token) {
+                obj = Box::from(Ctr::Symbol(s));
+            } else {
+                return Err(format!("Unparsable token: {}", token));
+            }
+            Ok(Box::new(Seg::from_mono(obj)))
+        } else {
+            Err(UNMATCHED_LIST_DELIM.to_string())
+        }
     }
 }