Support todo keywords with fast access.

src/parser/keyword_todo.rs

@@ -44,9 +44,17 @@ pub(crate) fn todo_keywords<'s>(input: &'s str) -> Res<&'s str, (Vec<&'s str>, V
 }
 
 fn todo_keyword_word<'s>(input: &'s str) -> Res<&'s str, &'s str> {
-    verify(take_till(|c| " \t\r\n|".contains(c)), |result: &str| {
+    let (remaining, keyword) = verify(take_till(|c| "( \t\r\n|".contains(c)), |result: &str| {
         !result.is_empty()
-    })(input)
+    })(input)?;
+
+    let (remaining, _) = opt(tuple((
+        tag("("),
+        take_till(|c| "() \t\r\n|".contains(c)),
+        tag(")"),
+    )))(remaining)?;
+
+    Ok((remaining, keyword))
 }
 #[cfg(test)]
 mod tests {