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Implement str.split(None). 

Note that splitting by explicit string is not implemented so far.
This commit is contained in:
Paul Sokolovsky 2014-01-21 05:00:21 +02:00
parent 7380a83780
commit 4c316552c1
2 changed files with 47 additions and 0 deletions
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40
py/objstr.c
View File

@ -175,6 +175,44 @@ bad_arg:
nlr_jump(mp_obj_new_exception_msg(MP_QSTR_TypeError, "?str.join expecting a list of str's"));
}
#define is_ws(c) ((c) == ' ' || (c) == '\t')
static mp_obj_t str_split(uint n_args, const mp_obj_t *args) {
int splits = -1;
mp_obj_t sep = mp_const_none;
if (n_args > 1) {
sep = args[1];
if (n_args > 2) {
splits = MP_OBJ_SMALL_INT_VALUE(args[2]);
}
}
assert(sep == mp_const_none);
mp_obj_t res = mp_obj_new_list(0, NULL);
const char *s = qstr_str(mp_obj_str_get(args[0]));
const char *start;
// Initial whitespace is not counted as split, so we pre-do it
while (is_ws(*s)) s++;
while (*s && splits != 0) {
start = s;
while (*s != 0 && !is_ws(*s)) s++;
rt_list_append(res, MP_OBJ_NEW_QSTR(qstr_from_strn_copy(start, s - start)));
if (*s == 0) {
break;
}
while (is_ws(*s)) s++;
if (splits > 0) {
splits--;
}
}
if (*s != 0) {
rt_list_append(res, MP_OBJ_NEW_QSTR(qstr_from_strn_copy(s, strlen(s))));
}
return res;
}
static bool chr_in_str(const char* const str, const size_t str_len, const char c) {
for (size_t i = 0; i < str_len; i++) {
if (str[i] == c) {
@ -293,12 +331,14 @@ mp_obj_t str_format(uint n_args, const mp_obj_t *args) {
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_find_obj, 2, 4, str_find);
static MP_DEFINE_CONST_FUN_OBJ_2(str_join_obj, str_join);
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_split_obj, 1, 3, str_split);
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_strip_obj, 1, 2, str_strip);
static MP_DEFINE_CONST_FUN_OBJ_VAR(str_format_obj, 1, str_format);
static const mp_method_t str_type_methods[] = {
{ "find", &str_find_obj },
{ "join", &str_join_obj },
{ "split", &str_split_obj },
{ "strip", &str_strip_obj },
{ "format", &str_format_obj },
{ NULL, NULL }, // end-of-list sentinel

7
tests/basics/string_split.py Normal file
View File

@ -0,0 +1,7 @@
print("a b".split())
print(" a b ".split(None))
print(" a b ".split(None, 1))
print(" a b ".split(None, 2))
print(" a b c ".split(None, 1))
print(" a b c ".split(None, 0))
print(" a b c ".split(None, -1))