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py: Implement builtin reversed() function.

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reversed function now implemented, and works for tuple, list, str, bytes
and user objects with __len__ and __getitem__.

Renamed mp_builtin_len to mp_obj_len to make it publically available (eg
for reversed).
This commit is contained in:
Damien George
2014-08-12 18:33:40 +01:00
parent 69c5fe1df6
commit 4c03b3a899
9 changed files with 125 additions and 12 deletions
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10
py/obj.c
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@@ -360,6 +360,16 @@ uint mp_get_index(const mp_obj_type_t *type, mp_uint_t len, mp_obj_t index, bool
return i;
}
// will raise a TypeError if object has no length
mp_obj_t mp_obj_len(mp_obj_t o_in) {
mp_obj_t len = mp_obj_len_maybe(o_in);
if (len == MP_OBJ_NULL) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "object of type '%s' has no len()", mp_obj_get_type_str(o_in)));
} else {
return len;
}
}
// may return MP_OBJ_NULL
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
if (