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py: Make str.[r]partition more efficient.

This commit is contained in:
Damien George 2014-03-21 20:39:40 +00:00
parent e3e7c2bafb
commit b035db355a
1 changed files with 31 additions and 15 deletions
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46
py/objstr.c
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@ -520,44 +520,60 @@ STATIC mp_obj_t str_count(uint n_args, const mp_obj_t *args) {
return MP_OBJ_NEW_SMALL_INT(num_occurrences);
}
STATIC mp_obj_t str_partitioner(mp_obj_t self_in, mp_obj_t arg, bool rpartition) {
STATIC mp_obj_t str_partitioner(mp_obj_t self_in, mp_obj_t arg, machine_int_t direction) {
assert(MP_OBJ_IS_STR(self_in));
if (!MP_OBJ_IS_STR(arg)) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"Can't convert '%s' object to str implicitly", mp_obj_get_type_str(arg)));
}
GET_STR_DATA_LEN(self_in, str, str_len);
GET_STR_DATA_LEN(arg, sep, sep_len);
mp_obj_t result[] = {MP_OBJ_NEW_QSTR(MP_QSTR_), MP_OBJ_NEW_QSTR(MP_QSTR_), MP_OBJ_NEW_QSTR(MP_QSTR_)};
if (sep_len == 0) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_ValueError, "empty separator"));
}
if (rpartition) {
result[2] = mp_obj_new_str(str, str_len, false);
mp_obj_t result[] = {MP_OBJ_NEW_QSTR(MP_QSTR_), MP_OBJ_NEW_QSTR(MP_QSTR_), MP_OBJ_NEW_QSTR(MP_QSTR_)};
if (direction > 0) {
result[0] = self_in;
} else {
result[0] = mp_obj_new_str(str, str_len, false);
result[2] = self_in;
}
for (machine_uint_t str_index = 0; str_index + sep_len <= str_len; str_index++) {
if (memcmp(&str[str_index], sep, sep_len) == 0) {
result[0] = mp_obj_new_str(str, str_index, false);
result[1] = arg;
result[2] = mp_obj_new_str(str + str_index + sep_len, str_len - str_index - sep_len, false);
if (!rpartition) {
if (str_len >= sep_len) {
machine_uint_t str_index, str_index_end;
if (direction > 0) {
str_index = 0;
str_index_end = str_len - sep_len;
} else {
str_index = str_len - sep_len;
str_index_end = 0;
}
for (;;) {
if (memcmp(&str[str_index], sep, sep_len) == 0) {
result[0] = mp_obj_new_str(str, str_index, false);
result[1] = arg;
result[2] = mp_obj_new_str(str + str_index + sep_len, str_len - str_index - sep_len, false);
break;
}
if (str_index == str_index_end) {
break;
}
str_index += direction;
}
}
return mp_obj_new_tuple(3, result);
}
STATIC mp_obj_t str_partition(mp_obj_t self_in, mp_obj_t arg, bool partition) {
return str_partitioner(self_in, arg, false);
STATIC mp_obj_t str_partition(mp_obj_t self_in, mp_obj_t arg) {
return str_partitioner(self_in, arg, 1);
}
STATIC mp_obj_t str_rpartition(mp_obj_t self_in, mp_obj_t arg, bool partition) {
return str_partitioner(self_in, arg, true);
STATIC mp_obj_t str_rpartition(mp_obj_t self_in, mp_obj_t arg) {
return str_partitioner(self_in, arg, -1);
}
STATIC machine_int_t str_get_buffer(mp_obj_t self_in, buffer_info_t *bufinfo, int flags) {