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str: Handle non-positive slice indexes.

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Paul Sokolovsky 2014-01-03 23:36:56 +02:00
parent 59800afae9
commit decad08ef5
1 changed files with 7 additions and 0 deletions
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7
py/objstr.c
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@ -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; int start, stop, step;
mp_obj_slice_get(rhs_in, &start, &stop, &step); mp_obj_slice_get(rhs_in, &start, &stop, &step);
assert(step == 1); 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)); return mp_obj_new_str(qstr_from_strn_copy(lhs_str + start, stop - start));
} else { } else {
// Throw TypeError here // Throw TypeError here