Commit 13cfabd1 authored by Paul Sokolovsky's avatar Paul Sokolovsky
Browse files

Implement slicing for lists.

parent 7364af2d
......@@ -396,3 +396,4 @@ typedef struct _mp_obj_classmethod_t {
// sequence helpers
void mp_seq_multiply(const void *items, uint item_sz, uint len, uint times, void *dest);
bool m_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end);
#define m_seq_copy(dest, src, len, item_sz) memcpy(dest, src, len * sizeof(item_sz))
......@@ -136,7 +136,15 @@ static mp_obj_t list_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
switch (op) {
case RT_BINARY_OP_SUBSCR:
{
// list load
#if MICROPY_ENABLE_SLICE
if (MP_OBJ_IS_TYPE(rhs, &slice_type)) {
machine_uint_t start, stop;
assert(m_seq_get_fast_slice_indexes(o->len, rhs, &start, &stop));
mp_obj_list_t *res = list_new(stop - start);
m_seq_copy(res->items, o->items + start, res->len, mp_obj_t);
return res;
}
#endif
uint index = mp_get_index(o->base.type, o->len, rhs);
return o->items[index];
}
......
......@@ -16,3 +16,7 @@ print(x)
x += [2, 1]
print(x)
print(x[1:])
print(x[:-1])
print(x[2:3])
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