Commit decad08e authored by Paul Sokolovsky's avatar Paul Sokolovsky
Browse files

str: Handle non-positive slice indexes.

parent 59800afa
......@@ -39,6 +39,13 @@ mp_obj_t str_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
int start, stop, step;
mp_obj_slice_get(rhs_in, &start, &stop, &step);
assert(step == 1);
int len = strlen(lhs_str);
if (start < 0) {
start = len + start;
}
if (stop <= 0) {
stop = len + stop;
}
return mp_obj_new_str(qstr_from_strn_copy(lhs_str + start, stop - start));
} else {
// Throw TypeError here
......
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