fixed top-level keys

src/main.rs

@@ -40,10 +40,13 @@ fn main() {
   } else { content = input.to_string(); }
 
   let mut tabkey: Vec<&str> = arguments[0].split(".").collect();
-  let mut indexvec: Vec<&str> = tabkey[1].split(&['[', ']'][..]).collect();
+  let mut indexvec = Vec::new();
-
-  tabkey[1] = indexvec.remove(0);
   let mut index: usize = 0;
+
+  match tabkey.iter().skip(1).peekable().peek() {
+    Some(_) => {
+      indexvec = tabkey[1].split(&['[', ']'][..]).collect();
+      tabkey[1] = indexvec.remove(0);
       if ! indexvec.is_empty() {
         let istr = indexvec.remove(0);
         match usize::from_str(istr) {
@@ -54,6 +57,9 @@ fn main() {
           },
         };
       }
+    },
+    None => {},
+  };
 
   let mut root = content.parse::<Value>().unwrap();