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py: Simplify and improve mp_get_index. 

It has (again) a fast path for ints, and a simplified "slow" path for
everything else.

Also simplify the way str indexing is done (now matches tuple and list).
This commit is contained in:
Damien George 2014-04-11 10:40:38 +00:00
parent 5f3fe3aa14
commit a9ddd6d9df
2 changed files with 15 additions and 20 deletions
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10
py/obj.c
View File

@ -277,12 +277,10 @@ void mp_obj_get_array_fixed_n(mp_obj_t o, uint len, mp_obj_t **items) {
// is_slice determines whether the index is a slice index
uint mp_get_index(const mp_obj_type_t *type, machine_uint_t len, mp_obj_t index, bool is_slice) {
int i;
if (MP_OBJ_IS_INT(index)) {
i = mp_obj_int_get_checked(index);
} else if (MP_OBJ_IS_TYPE(index, &mp_type_bool)) {
i = (index == mp_const_true ? 1 : 0);
} else {
machine_int_t i;
if (MP_OBJ_IS_SMALL_INT(index)) {
i = MP_OBJ_SMALL_INT_VALUE(index);
} else if (!mp_obj_get_int_maybe(index, &i)) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "%s indices must be integers, not %s", qstr_str(type->name), mp_obj_get_type_str(index)));
}

25
py/objstr.c
View File

@ -220,27 +220,24 @@ STATIC const byte *find_subbytes(const byte *haystack, machine_uint_t hlen, cons
STATIC mp_obj_t str_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
GET_STR_DATA_LEN(lhs_in, lhs_data, lhs_len);
switch (op) {
case MP_BINARY_OP_SUBSCR:
if (mp_obj_is_integer(rhs_in)) {
uint index = mp_get_index(mp_obj_get_type(lhs_in), lhs_len, rhs_in, false);
if (MP_OBJ_IS_TYPE(lhs_in, &mp_type_bytes)) {
return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)lhs_data[index]);
} else {
return mp_obj_new_str(lhs_data + index, 1, true);
}
case MP_BINARY_OP_SUBSCR: {
#if MICROPY_ENABLE_SLICE
} else if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_slice)) {
if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_slice)) {
machine_uint_t start, stop;
if (!m_seq_get_fast_slice_indexes(lhs_len, rhs_in, &start, &stop)) {
assert(0);
}
return mp_obj_new_str(lhs_data + start, stop - start, false);
#endif
} else {
// Message doesn't match CPython, but we don't have so much bytes as they
// to spend them on verbose wording
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "index must be int"));
}
#endif
mp_obj_type_t *type = mp_obj_get_type(lhs_in);
uint index = mp_get_index(type, lhs_len, rhs_in, false);
if (type == &mp_type_bytes) {
return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)lhs_data[index]);
} else {
return mp_obj_new_str(lhs_data + index, 1, true);
}
}
case MP_BINARY_OP_ADD:
case MP_BINARY_OP_INPLACE_ADD: