close #35

src/select/mod.rs

@@ -439,9 +439,9 @@ fn walk<'a, F>(vec: &[&'a Value], tmp: &mut Vec<&'a Value>, fun: &F)
 
 fn abs_index(n: isize, len: usize) -> usize {
     if n < 0_isize {
-        (n + len as isize) as usize
+        (n + len as isize).max(0) as usize
     } else {
-        n as usize
+        n.min(len as isize) as usize
     }
 }
 

tests/filter.rs

@@ -602,6 +602,16 @@ fn range() {
         json!(["first", "second", "third", "forth", "fifth"]),
         json!(["first", "third"]),
     );
+    select_and_then_compare(
+        "$[-4:]",
+        json!(["first", "second", "third"]),
+        json!(["first", "second", "third"]),
+    );
+    select_and_then_compare(
+        "$[:4]",
+        json!(["first", "second", "third"]),
+        json!(["first", "second", "third"]),
+    );
 }
 
 #[test]